WO2018157549A1

WO2018157549A1 - Intelligent feedback type variable throttle buffering system and method

Info

Publication number: WO2018157549A1
Application number: PCT/CN2017/095573
Authority: WO
Inventors: 王成龙; 邱志伟; 曾庆良; 陈萌; 刘志海; 马凡凡; 孟昭胜; 冯鹏超
Original assignee: 山东科技大学
Priority date: 2017-03-01
Filing date: 2017-08-02
Publication date: 2018-09-07
Also published as: CN106641074B; CN106641074A

Abstract

An intelligent feedback type variable throttle buffering system and method, applicable to a buffering apparatus. The buffering system comprises a linear motor (1), a direct acting cylinder (2), a stroke control valve block (3), a stepping motor (6), a throttle control valve block (7), an acquisition processor (8), a controller (9), a pressure sensor (10), a buffering cylinder (11), a buffering cylinder cover (13), a speed sensor (14), and a displacement sensor (16). Automatic adjustment of buffering capacity within a large range is implemented by means of closed-loop control of the speed sensor (14) and the pressure sensor (10). One end of the direct acting cylinder (2) is connected to the linear motor (1), and the other end is connected to the stroke control valve block (3). The stroke control valve block (3) is connected to the buffering cylinder (11) by means of a pipe. One end of the buffering cylinder (11) is connected with the throttle control valve block (7), and the other end is connected with the buffering cylinder cover (13). The speed sensor (14) and the displacement sensor (16) are connected to the buffering cylinder cover (13). The controller (9) and the pressure sensor (10) are connected to the throttle control valve block (7). The stepping motor (6) coaxial with the buffering cylinder (11) is connected to the throttle control valve block (7). The buffering system and buffering method can buffer an uncertain impact load, effectively reduce the volume of a power source, and compensate for hydraulic oil leakage of a hydraulic buffer.

Description

Intelligent feedback type variable throttle buffer system and buffering method thereof

Technical field

The invention relates to a variable throttle buffer system and a buffering method thereof, in particular to an intelligent feedback variable throttle buffering system and a buffering method thereof.

Background technique

The buffering device is one of the indispensable parts of various types of machines, and the existing buffer can only manually adjust the buffering capacity in a small range, and the degree of automation is low, and the capacity and stroke of the buffer cannot be adjusted in real time according to the impact load. The buffer of the overload load cannot be completed and the machine cannot be reliably protected. The buffer capacity can only be used below the rated buffer capacity, which cannot meet the shock buffer and uncertainty buffer of the large span.

The Chinese patent discloses a hydraulic shock absorber that automatically adjusts the cushioning force. The publication number is CN202251621. The main structure includes a piston, a piston rod, a cylinder barrel, a sponge, a sealing ring, a guide sleeve and a valve piece. The working process: setting the oil drain on the piston The channel controls the flow of oil flowing through the drain passage through the valve plate. When the external impact force suddenly increases, the edge of the valve plate will closely contact the piston, and the flow rate of the oil flowing through the drain passage is reduced, so the buffering force is increased. When the external impact force is reduced, the edge of the valve piece will slowly return to its original shape, the flow rate of the oil flowing through the drain passage will increase, and the damping force will be reduced accordingly, thus realizing the automatic adjustment of the buffer force with the impact force. The shortcomings exist: the buffer capacity cannot be adjusted, and the impact load under the overload condition cannot be effectively buffered, and the adaptive adjustment with the working condition cannot be realized, and the degree of intelligence is not high.

Summary of the invention

The object of the present invention is to provide an intelligent feedback variable throttle buffer system, which solves the problem that the existing buffer can only be used below its rated buffer capacity, and cannot meet the shock buffer and uncertainty buffer of a large span.

The object of the present invention is achieved as follows: the intelligent feedback type variable throttle of the present invention includes a buffer system and a buffering method;

The buffer system realizes the automatic adjustment of the buffer capacity in a wide range by the closed-loop control of the speed sensor and the pressure sensor. The specific structure includes: linear motor, linear motion cylinder, stroke control valve block, stepping motor, throttle control valve block, and acquisition processing. , controller, pressure sensor, buffer cylinder, buffer cylinder head, speed sensor, displacement sensor;

One end of the direct acting cylinder is connected with the linear motor, the other end is connected with the stroke control valve block, and the stroke control valve block is connected to the buffer cylinder through a pipe; the throttle cylinder is connected with a throttle control valve block at one end and the buffer cylinder head is connected to the other end. a speed sensor and a displacement sensor are connected to the buffer cylinder head; an acquisition processor, a controller and a pressure sensor are connected to the throttle control valve block; and a stepping coaxial with the buffer cylinder is connected to the throttle control valve block; The output end of the controller is respectively connected with each proportional control valve, stepping motor and linear motor; the output ends of the pressure sensor, the speed sensor and the displacement sensor are connected with the input end of the acquisition processor, and the controller is based on the acquisition processor Input signal, respectively Each valve or motor implements control.

The controller is a single chip controller; or a PLC controller.

The buffer cylinder comprises: a support rod, a buffer cylinder piston rod, a buffer cylinder having a rod cavity pipe, a fuel tank, a liquid filling valve, a buffer cylinder rodless cavity pipe, a return oil pipe, a buffer cylinder outer cylinder, a return spring, and a buffer cylinder Cylinder, buffer cylinder piston and buffer cylinder reset piston;

The buffer cylinder outer cylinder is provided with a buffer cylinder inner cylinder, and a return spring, a screw rod and a buffer cylinder reset piston are arranged between the buffer cylinder outer cylinder and the buffer cylinder inner cylinder; and a buffer cylinder is arranged at one end of the buffer cylinder outer cylinder and the buffer cylinder inner cylinder The cylinder head and the support rod connect the buffer cylinder outer cylinder and the buffer cylinder inner cylinder to the throttle control valve block through the buffer cylinder cylinder cover; the buffer cylinder piston is arranged in the buffer cylinder inner cylinder, and one end of the buffer cylinder piston rod and the buffer cylinder piston Connected, the other end of the buffer cylinder piston rod passes through the buffer cylinder head; there is a fuel tank on the outer side of the outer cylinder of the buffer cylinder, and the oil return pipe is connected between the fuel tank and the stroke control valve block; the stroke control valve block and the throttle control A buffer cylinder without rod cavity is connected between the valve blocks; a buffer cylinder having a rod cavity pipe and a liquid filling valve is connected between the stroke control valve block and the buffer cylinder head.

The throttle control valve block comprises: a plug, an orifice, a coupling, a screw and a valve core;

The center of the end of the throttle control valve block and the stepping motor is connected with a coupling, a lead screw and a valve core; the end of the throttle control valve block and the buffer cylinder is sequentially connected with a plug and an orifice, One side of the orifice communicates with the rodless chamber of the buffer cylinder, and the other side communicates with the buffer cylinder reset chamber.

The direct acting cylinder comprises: a three-position two-way proportional valve with a rod cavity, a three-position two-way proportional valve without a rod cavity, a cylinder of a direct-acting cylinder, a piston of a direct-acting cylinder, an oil passage of a stroke control valve block, and a piston of a direct-acting cylinder Rod and vent;

The stroke control valve block connected to the linear motion cylinder is connected with a rod cavity three-position two-way proportional valve and a rodless cavity three-position two-way proportional valve; there is a stroke control valve block oil passage in the stroke control valve block; The other end of the cylinder is connected with a direct-acting cylinder head, and the cylinder of the direct-acting cylinder is located between the direct-acting cylinder and the linear motor; the cylinder of the direct-acting cylinder is provided with a vent hole; and the piston of the direct-acting cylinder has a piston of the direct-acting cylinder, A piston of the direct acting cylinder is connected to the piston of the direct acting cylinder, and the piston rod of the direct acting cylinder is connected with the linear motor; the oil path of the stroke control valve block and the oil tank, the buffer cylinder have a rod cavity oil passage, and the buffer cylinder has no rod cavity oil. The track is connected to the linear cylinder.

The speed sensor is mounted on the top of the buffer cylinder.

(1) The speed sensor detects the speed of the impact object, and adjusts the buffer stroke and the initial pressure in real time through the stroke control valve block;

(2) When the impact body contacts the piston rod head, the speed sensor detects the velocity of the impact object in real time, the pressure sensor detects the pressure of the buffer chamber in real time, and the measured speed signal and pressure signal are input to the acquisition processor, and the acquisition processor will The data is converted and calculated, and the processed data is transmitted to the controller, and the controller outputs a control signal to control the throttle area of the buffer device through the throttle control valve block.

Specific steps are as follows:

The speed sensor detects the velocity v _{2 of the} current impact object, and the pressure sensor located in the buffer chamber of the buffer detects that the internal pressure of the buffer cylinder is p ₂ , and the two are input to the acquisition processor, and the acquisition processor automatically calculates the current buffer. The optimal throttle area s ₂ , the current buffer throttle area is s ₃ , the acquisition processor automatically calculates the difference between s ₂ -s ₃ , passes the processed data to the controller, and the controller outputs a control signal. .

When s ₂ >s ₃ , the most pre-throttle area required to complete the current buffer is larger than the current throttle area, the controller controls the stepping motor, and the stepping motor drives the spool to move linearly through the screw to reduce the orifice. The area covered by the spool reaches the optimal pre-throttle area s ₂ to complete the current buffer;

When s ₂ <s ₃ , that is, the optimal throttle area required to complete the current buffer is smaller than the current throttle area, the controller controls the stepping motor, and the stepping motor drives the spool to move linearly through the screw to increase the orifice. The area covered by the valve core reaches the optimal pre-throttle area s ₂ for completing the current buffer;

Since the movement of the buffer cylinder piston has a rod cavity requiring oil replenishment, a liquid filling valve is provided. When the buffer cylinder piston rod moves rapidly, the liquid filling valve opens to replenish the rod chamber of the buffer cylinder.

Benefits and advantages:

1. The buffer capacity changes according to the impact load change, achieving efficient buffering;

2. The closed loop control system is used to realize the automatic adjustment of the buffer stroke and the throttle area;

3. A buffer with a wide range of impact load variation can buffer small impact loads and buffer large impact loads.

4. Through the automatic detection and control system, the buffer of the uncertain impact load is realized.

5. The linear motor is used to drive the linear motion cylinder to provide the power to adjust the stroke, effectively reducing the volume of the power source;

BRIEF DESCRIPTION OF THE DRAWINGS:

Fig. 1 is a structural view of the present invention.

Figure 2 is a structural view of a buffer cylinder of the present invention.

Figure 3 is a structural view of a direct acting cylinder of the present invention.

In the figure, 1, linear motor; 2, linear cylinder; 3, stroke control valve block; 4, three-position two-way proportional valve with rod cavity; 5, three-position two-way proportional valve without rod cavity; 7. Throttle control valve block; 8, acquisition processor; 9, controller, 10, pressure sensor; 11, buffer cylinder; 12, support rod; 13, buffer cylinder head; 14, speed sensor; Cylinder piston rod; 16, displacement sensor; 17, buffer cylinder with rod cavity pipe; 18, fuel tank; 19, liquid filling valve; 20, buffer cylinder without rod cavity; 21, oil return pipe; 22, straight cylinder head 23, buffer cylinder outer cylinder; 24, return spring; 25, buffer cylinder inner cylinder; 26, buffer cylinder piston; 27, plug; 28, throttle hole; 29, coupling; 30, screw; 31, valve core; 32, buffer cylinder reset piston; 33, direct-acting cylinder piston, 34, stroke control valve block oil circuit; 35, direct-acting cylinder piston rod; 36, vent hole.

detailed description

The intelligent feedback type variable throttle of the present invention includes a buffer system and a buffering method;

The buffer system realizes the automatic adjustment of the buffer capacity in a wide range by the closed-loop control of the speed sensor and the pressure sensor. The specific structure includes: linear motor 1, linear motion cylinder 2, stroke control valve block 3, stepping motor 6, throttle control valve Block 7, the acquisition processor 8, the controller 9, the pressure sensor 10, the buffer cylinder 11, the buffer cylinder head 13, the speed sensor 14, the displacement sensor 16;

One end of the linear cylinder 2 is connected to the linear motor 1, the other end is connected to the stroke control valve block 3, and the stroke control valve block 3 is connected to the buffer cylinder 11 through a pipe; the throttle cylinder 11 is connected to the throttle control valve block 7 at one end thereof, and a buffer cylinder head 13 is connected to one end; a speed sensor 14 and a displacement sensor 16 are connected to the buffer cylinder head 13; an acquisition processor 8, a controller 9 and a pressure sensor 10 are connected to the throttle control valve block 7; The flow control valve block 7 is connected with a stepping motor 6 coaxial with the buffer cylinder 11; the output ends of the controller 9 are respectively associated with the respective proportional control valves, the stepping motor and the linear motor 1; the pressure sensor 9, the speed sensor 13 and the displacement The output end of the sensor 15 is connected to the input end of the acquisition processor 8, and the controller 9 respectively controls each valve or motor according to the input signal of the acquisition processor 8;

The controller is a single chip controller; or a PLC controller.

The buffer cylinder comprises: a support rod 12, a buffer cylinder piston rod 15, a buffer cylinder rod chamber pipe 17, a fuel tank 18, a liquid filling valve 19, a buffer cylinder rodless chamber pipe 20, a return oil pipe 21, a buffer cylinder outer cylinder 23, the return spring 24, the buffer cylinder inner cylinder 25, the buffer cylinder piston 26 and the buffer cylinder reset piston 32;

The buffer cylinder outer cylinder 23 is provided with a buffer cylinder inner cylinder 25, and between the buffer cylinder outer cylinder 23 and the buffer cylinder inner cylinder 25, there are a return spring 23, a screw rod 29 and a buffer cylinder reset piston 32; a buffer cylinder outer cylinder 23 and a buffer One end of the cylinder inner cylinder 54 has a buffer cylinder head 13, and the support rod 12 connects the buffer cylinder outer cylinder 23 and the buffer cylinder inner cylinder 25 to the throttle control valve block 7 through the buffer cylinder head 13; There is a buffer cylinder piston 26, one end of the buffer cylinder piston rod 15 is connected with the buffer cylinder piston 26, the other end of the buffer cylinder piston rod 15 is passed through the buffer cylinder head 13; and the tank 18 is provided on the outer side of the buffer cylinder outer cylinder 23, A return oil pipe 21 is connected between the oil tank 18 and the stroke control valve block 3; a buffer cylinder rodless chamber pipe 20 is connected between the stroke control valve block 3 and the throttle control valve block 7; in the stroke control valve block 3 and the buffer A buffer cylinder having a rod chamber pipe 17 and a liquid filling valve 19 are connected between the cylinder heads 13.

The throttle control valve block 7 includes: a plug 27, an orifice 28, a coupling 29, a lead screw 30 and a spool 31;

The center of one end of the throttle control valve block 7 and the stepping motor 6 is connected with a coupling 29, a lead screw 30 and a valve core 31; the end of the throttle control valve block 7 connected to the buffer cylinder 11 is sequentially connected with a plug 27 And the orifice 28, as described One side of the orifice communicates with the rodless chamber of the buffer cylinder, and the other side communicates with the buffer cylinder reset chamber.

The plug is to isolate the oil passage formed by the valve block from being formed outside the processing process, so that the oil body is not leaked.

The direct acting cylinder 2 comprises: a rod cavity three-position two-way proportional valve 4, a rodless cavity three-position two-way proportional valve 5, a direct-acting cylinder head 22, a direct-acting cylinder piston 33, a stroke control valve block oil passage 34, the direct acting cylinder piston rod 35 and the venting hole 36;

The stroke control valve block 3 connected to the linear cylinder 2 is connected with a rod cavity three-position two-way proportional valve 4 and a rodless chamber three-position two-way proportional valve 5; and a stroke control valve block oil in the stroke control valve block 3 The other end of the direct-acting cylinder 2 is connected with a linear cylinder head 22, the linear cylinder head 22 is located between the linear cylinder 2 and the linear motor 1; the linear cylinder head is provided with a venting opening 36; a linear cylinder piston 33 is arranged in the linear cylinder 2, and a linear cylinder piston rod 35 is connected to the linear cylinder piston 33. The linear cylinder piston rod 35 is connected to the linear motor 1; the stroke control valve block 34 is The oil passage is connected to the oil tank 18, the buffer cylinder, the rod chamber oil passage 17, the buffer cylinder rodless chamber oil passage 20, and the linear motion cylinder 2.

The speed sensor 14 is mounted on the top of the buffer cylinder, and the buffering method is as follows:

Specific steps are as follows:

The speed sensor 14 located at the top of the buffer cylinder detects the velocity v _{2 of the} current impact object, and the pressure sensor 10 located in the buffer chamber of the buffer detects that the internal pressure of the buffer cylinder is p ₂ , and the two are commonly input to the acquisition processor 8 for collection and processing. The controller 8 automatically calculates the optimal throttle area s ₂ for completing the current buffer, and the current buffer throttle area is s ₃ , and the acquisition processor 8 automatically calculates the difference between s ₂ -s ₃ and the processed data. It is passed to the controller 9, which outputs a control signal.

When s ₂ >s ₃ , that is, the most pre-throttle area required to complete the current buffer is larger than the current throttle area, the controller 9 controls the stepping motor 6, and the stepping motor 6 drives the spool 31 to move linearly through the lead screw 30, Causing the orifice 28 to reduce the area covered by the spool to the optimum pre-throttle area s ₂ for completing the current buffer;

When s ₂ <s ₃ , that is, the optimal throttle area required to complete the current buffer is smaller than the current throttle area, the controller 9 controls the stepping motor 6, and the stepping motor 6 drives the spool 31 to move linearly through the lead screw 30, Causing the orifice 28 to increase the area covered by the spool to achieve the optimal pre-throttle area s _{2 for the} current buffer;

Since the movement of the buffer cylinder piston 26 requires the oil to be replenished, the liquid filling valve 19 is provided as the buffer cylinder piston. When the rod 15 moves rapidly, the filling valve 19 opens to replenish the rod chamber of the buffer cylinder.

Embodiment 1: The speed sensor 14 located at the top of the buffer cylinder detects the velocity v _{2 of the} current impact object, and the pressure sensor 9 located in the buffer chamber of the buffer detects that the internal pressure of the buffer cylinder is p ₂ , and the two are commonly input to the acquisition processor. 8, the acquisition processor 8 automatically calculates the optimal throttle area s _{2 to} complete the current buffer, the current buffer throttle area is s ₃ , the acquisition processor 8 automatically calculates the difference between s ₂ -s ₃

Since the movement of the buffer cylinder piston 26 requires oil to be replenished, the liquid filling valve 19 is provided. When the buffer cylinder piston rod 15 moves rapidly, the liquid filling valve 19 opens to replenish the rod chamber of the buffer cylinder.

The specific work process:

First, the buffer stroke adjustment

The speed sensor 14 located at the top of the buffer cylinder detects the velocity of the impact object in real time, transmits the speed signal to the acquisition processor 8, the acquisition processor 8 converts and calculates the speed signal, and the acquisition processor 8 transmits the calculation result to the controller 8. The controller 9 drives the linear motor 1, the linear motor 1 directly drives the linear motion cylinder piston 33, the linear motion cylinder 2 outputs the pressure oil, passes through the rodless cavity three-position two-way proportional valve 5 and the rod cavity three-position two-way proportional valve 4 Adjusting the flow rate of the output hydraulic oil, adjusting the speed of the output buffer cylinder 11 to the hydraulic oil, thereby adjusting the stroke of the buffer cylinder 11, the specific adjustment process is as follows: the speed sensor 14 detects the impact velocity, and the speed sensor 14 transmits the speed signal to the acquisition processor. 8. The acquisition processor 8 converts and calculates the speed signal, and the acquisition processor 8 transmits the calculation result to the controller 8. The controller 9 calculates the buffer stroke x required for the current completion of the buffer, and the displacement sensor 15 at the top of the buffer cylinder The current buffer stroke x _{1 is} detected and the acquisition processor 8 automatically calculates the difference between xx ₁ .

If x>x ₁ , that is, the current buffer stroke is greater than the current buffer stroke, it is necessary to increase the buffer stroke of the buffer cylinder 11 , and the rodless three-position two-way proportional valve 5 connects the pressure oil to the buffer cylinder 11 without the rod cavity, The rod cavity three-position two-way proportional valve 4 connects the rod chamber of the buffer cylinder 11 to the oil tank 18, so that the pressure oil pushes the buffer cylinder piston rod 15 outward until the displacement sensor 16 detects that the stroke s capable of completing the current buffer is reached. At this time, the controller 8 will send a signal to return the rodless three-position two-way proportional valve 5 and the rod-cavity three-position two-way proportional valve 4 to the neutral position, and the linear motor 1 stops moving to complete the stroke adjustment function;

If s<s ₁ , that is, the current buffer stroke is less than the current buffer stroke, the buffer stroke of the buffer cylinder 11 needs to be reduced, and the rodless three-position two-way proportional valve 5 connects the pressure oil to the oil tank 18, and has three rod chambers. The two-way proportional valve 4 connects the rod cavity of the buffer cylinder 11 to the rodless chamber of the buffer cylinder 11, so that the pressure oil retracts the buffer cylinder piston rod 15 inwardly until the displacement sensor detects that the stroke s capable of completing the current buffer is reached. At this time, the controller will send a signal to return the rodless three-position two-way proportional valve 5 and the rod-cavity three-position two-way proportional valve 4 to the neutral position, and the linear motor stops moving to complete the stroke adjustment; all the control valves are in the middle. The bit functions are all O-type.

Second, the initial pressure setting

The speed sensor 14 located at the top of the buffer cylinder detects the velocity of the impact object in real time, transmits the speed signal to the acquisition processor 8, the acquisition processor 8 converts and calculates the speed signal, and the acquisition processor 8 transmits the calculation result to the controller 8. The controller 9 calculates the optimal initial pressure p required to complete the current buffer according to the current velocity of the impact object. The pressure sensor 10 inside the buffer cylinder detects that the current buffer cylinder internal pressure value is p ₁ , and the acquisition processor 8 automatically calculates pp _{1 .} The difference between.

When p>p ₁ , that is, the optimal initial pressure p required to complete the current buffer is greater than the internal pressure p _{1 of the} current buffer cylinder 11 , the internal pressure of the buffer cylinder 11 needs to be increased, so that the current buffer can be most effectively completed, and the controller 9 controls the straight line. Motor 1, linear motor 1 directly drives the linear piston 33 movement, the linear cylinder 2 outputs the pressure oil, the rodless three-position two-way proportional valve 5 is connected to the pressure oil, and the rod cavity three-position two-way proportional valve 4 is in the middle. In the position state, the pressure oil of the buffer cylinder without the rod cavity compresses the return spring 32 until the internal pressure sensor 10 of the buffer cylinder 11 detects that the internal pressure of the buffer cylinder 11 reaches the optimum initial pressure p required to complete the current buffer, and the controller 9 issues The signal returns the linear motor 1 and all control valves to the neutral position;

When p>p ₁ , that is, the optimal initial pressure p required to complete the current buffer is smaller than the internal pressure p _{1 of the} current buffer cylinder 11 , the internal pressure of the buffer cylinder 11 needs to be lowered, so that the current buffer can be most effectively completed, and the controller 9 controls the straight line. Motor 1, linear motor 1 directly drives the linear piston 33 movement, the linear cylinder 2 sucks oil from the buffer cylinder, the rodless three-position two-way proportional valve 5 is connected to the linear cylinder, and the rod cavity three-position two-way proportional valve 4 In the neutral state, the pressure oil of the buffer cylinder without the rod cavity releases the return spring 32 until the internal pressure sensor 10 of the buffer cylinder 11 detects that the internal pressure of the buffer cylinder 11 reaches the optimum initial pressure p required to complete the current buffer, and controls The signal is sent to return the linear motor 1 and all control valves to the neutral position;

Third, throttle area adjustment

(1) The impact object is not in contact with the buffer cylinder piston rod

The speed sensor 14 located at the top of the buffer cylinder detects the velocity of the impact object in real time, transmits the speed signal to the acquisition processor 8, the acquisition processor 8 converts and calculates the speed signal, and the acquisition processor 8 transmits the calculation result to the controller 8. The acquisition processor 8 calculates the optimal pre-throttle area s required to complete the current buffer, the current buffer has a throttle area of s ₁ , and the acquisition processor 8 automatically calculates the difference between ss ₁ and the controller 9 controls The stepping motor 6, the stepping motor 6 drives the spool 31 to move linearly through the lead screw 30, so that the area of the orifice 28 reaches the optimal pre-throttle area s for completing the current buffer, and the adjustment amount is excessive when the instantaneous impact is avoided.

When s> s _1, that is required to complete the current buffer throttle area is larger than the current optimal pre-throttle area, the controller 9 controls the stepper motor 6, the stepping motor 6 moves the spool 31 linearly driven by the lead screw 30, Causing the orifice 28 to reduce the area covered by the spool to the optimum pre-throttle area s to complete the current buffer;

If s <s _1, that is required to complete the current buffer area is less than the current optimal pre-orifice throttle area, the controller 9 controls the stepper motor 6, the stepping motor 6 moves the spool 31 linearly driven by the lead screw 30, Causing the orifice 28 to increase the area covered by the spool to achieve the optimal pre-throttle area s of the current buffer;

(2) The impact object contacts the buffer cylinder piston rod

When the impacting material contacts the buffer cylinder piston rod 15, the velocity of the impacting object and the pressure in the buffering chamber are constantly changed, and the key factors affecting the buffering efficiency are the velocity of the impacting object and the pressure in the buffering chamber, by detecting the impacting object. The speed and the pressure in the buffer chamber, thus controlling the throttle surface, can maximize the buffer efficiency of the buffer.

Claims

An intelligent feedback variable throttle buffering system, characterized in that: the buffering system comprises: a linear motor, a linear motion cylinder, a stroke control valve block, a stepping motor, a throttle control valve block, an acquisition processor, a controller, a pressure sensor, Buffer cylinder, buffer cylinder head, speed sensor, displacement sensor; automatic adjustment of buffer capacity in a wide range by closed-loop control of speed sensor and pressure sensor;

One end of the linear cylinder is connected with the linear motor, the other end is connected with the stroke control valve block, and the stroke control valve block is connected to the buffer cylinder through a pipeline; the throttle cylinder is connected with a throttle control valve block at one end and a buffer cylinder at the other end; a cylinder head; a speed sensor and a displacement sensor are connected to the buffer cylinder head; the throttle control valve block is connected with an acquisition processor, a controller and a pressure sensor; and the throttle control valve block is connected and buffered a stepping motor with a cylinder coaxial; an output end of the controller and each proportional control valve, a stepping motor and a linear motor; the output ends of the pressure sensor, the speed sensor and the displacement sensor are both connected to an input end of the acquisition processor Connected, the controller controls each valve or motor according to the input signal of the acquisition processor; the controller is a single-chip controller; or a PLC controller.
The intelligent feedback variable throttle buffer system according to claim 1, wherein the buffer cylinder comprises: a support rod, a buffer cylinder piston rod, a buffer cylinder rod chamber, a fuel tank, a liquid filling valve, and a buffer. Cylinder-free tube, oil return pipe, buffer cylinder outer cylinder, return spring, buffer cylinder inner cylinder, buffer cylinder piston and buffer cylinder reset piston;

The buffer cylinder outer cylinder is provided with a buffer cylinder inner cylinder, and a return spring, a screw rod and a buffer cylinder reset piston are arranged between the buffer cylinder outer cylinder and the buffer cylinder inner cylinder; and one end of the buffer cylinder outer cylinder and the buffer cylinder inner cylinder are The buffer cylinder head, the support rod connects the buffer cylinder outer cylinder and the buffer cylinder inner cylinder to the throttle control valve block through the buffer cylinder head; the buffer cylinder piston in the buffer cylinder inner cylinder, the buffer cylinder piston rod end and the buffer Cylinder piston connection, the other end of the buffer cylinder piston rod passes through the buffer cylinder head; on the outer side of the outer cylinder of the buffer cylinder, there is a fuel tank, and the oil return pipe is connected between the fuel tank and the stroke control valve block; in the stroke control valve block and section A buffer cylinder rodless chamber is connected between the flow control valve blocks; a buffer cylinder having a rod cavity pipe and a liquid filling valve is connected between the stroke control valve block and the buffer cylinder head.
The intelligent feedback variable throttle buffer system according to claim 1, wherein the throttle control valve block comprises: a plug, an orifice, a coupling, a screw and a valve core;

a coupling, a lead screw and a valve core are sequentially connected to a center of one end of the throttle control valve block and the stepping motor; a plug and an orifice are sequentially connected to one end of the throttle control valve block and the buffer cylinder; One side of the orifice is connected to the rodless chamber of the buffer cylinder, and the other side is in communication with the buffer cylinder reset chamber.
The intelligent feedback variable throttle buffer system according to claim 1, wherein the direct acting cylinder comprises: a three-position two-way proportional valve with a rod cavity, a three-position two-way proportional valve without a rod cavity, and a straight Cylinder head, straight cylinder, piston The control valve block oil passage, the direct acting cylinder piston rod and the vent hole;

The stroke control valve block connected to the linear motion cylinder is connected with a rod cavity three-position two-way proportional valve and a rodless cavity three-position two-way proportional valve; there is a stroke control valve block oil passage in the stroke control valve block; The other end of the cylinder is connected with a direct-acting cylinder head, and the cylinder of the direct-acting cylinder is located between the direct-acting cylinder and the linear motor; the cylinder of the direct-acting cylinder is provided with a vent hole; and the piston of the direct-acting cylinder has a piston of the direct-acting cylinder, A piston of the direct acting cylinder is connected to the piston of the direct acting cylinder, and the piston rod of the direct acting cylinder is connected with the linear motor; the oil path of the stroke control valve block and the oil tank, the buffer cylinder have a rod cavity oil passage, and the buffer cylinder has no rod cavity oil. The track is connected to the linear cylinder.
An intelligent feedback variable throttle buffering method is characterized in that: the speed sensor is installed on the top of the buffer cylinder, and the buffering method comprises:

(1) The speed sensor detects the speed of the impact object, and adjusts the buffer stroke and the initial pressure in real time through the stroke control valve block;

(2) When the impact body contacts the piston rod head, the speed sensor detects the velocity of the impact object in real time, the pressure sensor detects the pressure of the buffer chamber in real time, and the measured speed signal and pressure signal are input to the acquisition processor, and the acquisition processor will data. The conversion and calculation are performed, and the processed data is transmitted to the controller, and the controller outputs a control signal to control the throttle area of the buffer device through the throttle control valve block.
The intelligent feedback variable throttle buffering method according to claim 5, wherein the speed sensor detects the velocity v 2 of the current impact object, and the pressure sensor located in the buffer chamber of the buffer detects the internal pressure of the buffer cylinder as p 2 , the two input to the acquisition processor, the acquisition processor automatically calculates the optimal throttle area s 2 to complete the current buffer, the current buffer throttle area is s 3 , the acquisition processor automatically calculates s 2 -s 3 The difference between the processed data is passed to the controller, and the controller outputs a control signal;

When s 2 >s 3 , the most pre-throttle area required to complete the current buffer is larger than the current throttle area, the controller controls the stepping motor, and the stepping motor drives the spool to move linearly through the screw to reduce the orifice. The area covered by the spool reaches the optimal pre-throttle area s 2 to complete the current buffer;

When s 2 <s 3 , that is, the optimal throttle area required to complete the current buffer is smaller than the current throttle area, the controller controls the stepping motor, and the stepping motor drives the spool to move linearly through the screw to increase the orifice. The area covered by the valve core reaches the optimal pre-throttle area s 2 for completing the current buffer;

The buffer cylinder piston moves, and the rod chamber needs oil replenishment. Therefore, the liquid filling valve is provided. When the buffer cylinder piston rod moves quickly, the liquid filling valve opens to replenish the rod chamber of the buffer cylinder.