CN202471336U - Portable handheld pressure tester - Google Patents

Abstract

The utility model relates to a portable hand-held pressure tester, which is characterized in that it includes four current pressure sensors, four cable channel interfaces, a signal conditioning module, an A/D conversion module, a data processing module, a central processing unit, Data storage module, human-computer interaction module and battery energy module; the pressure signals collected by four current pressure sensors are respectively input into the signal conditioning module through four cable channel interfaces, and after the pressure signals are converted into DC voltage signals, the A/D The conversion module is input into the data processing module for range and unit conversion, the converted signal is input into the central processing unit, and the processed signal is stored in the data storage module; the output end of the central processing unit is also connected to the human-computer interaction module for data display, The input end of the central processing unit is also connected to the battery energy module. The utility model can be widely used in online detection and data recording of various high-power vehicle gearbox hydraulic systems.

Description

A Portable Handheld Pressure Tester

technical field

The utility model relates to a pressure tester, in particular to a portable hand-held pressure tester for testing the pressure signal of a high-power vehicle gearbox.

Background technique

At present, wet clutch gearboxes are widely used in many crawler vehicles and construction machinery. This gearbox is an organic synthesis of machinery, electricity and hydraulics, and has technical characteristics such as hydraulic transmission, hydraulic stepless steering, power shifting and automatic transmission. , with complete functions and advanced technical level, with the rapid improvement of gearbox performance and informatization level, the failure rate will also increase. There is a large amount of hydraulic oil medium inside the wet clutch gearbox. The oil is not only the lubricating oil for gears and bearings, but also the cooling oil for the friction plate, the working oil for the clutch, and the hydraulic oil for the steering system. Different systems and parts The oil pressure is also different. Therefore, the oil pressure is one of the important characteristic parameters to characterize the different parts and functional components of the wet clutch gearbox. To carry out research on condition monitoring and fault diagnosis of wet clutch gearboxes, it is first necessary to monitor the pressure levels and changes in different systems and parts, and then carry out in-depth analysis and fault diagnosis research. Pressure testing is the basis for state monitoring and fault diagnosis of wet clutch gearboxes. important technical approach.

In recent years, mechanical device condition monitoring and signal testing technology have developed rapidly, and research methods and methods are changing with each passing day, especially in the field of mechanical fault diagnosis and condition monitoring instrument research and development. Good results have been achieved. However, for the complex transmission system of high-power crawler vehicle wet clutch gearbox, there is no special portable pressure testing instrument. Although there are many special pressure testing equipment at home and abroad, these equipment have the following disadvantages: 1. The equipment joint does not match the pressure measuring point interface of the gearbox, and the transition joint needs to be specially designed and processed, which is inconvenient to install and use. 2. It only simply displays the instantaneous pressure value, but does not record the pressure change process, let alone give the pressure change law curve, which does not meet the needs of the gearbox pressure test. 3. The anti-interference ability of the pressure sensor is not strong, and the pressure measurement range is small. The supporting pressure sensor is not suitable for pressure measurement under high temperature and high pressure environment. 4. There is no special supporting wrench and pressure oil gauge, and the installation and disassembly of the sensor is inconvenient. 5. Generally, only single-channel or dual-channel data can be collected, and the number of channels is relatively small.

Contents of the invention

In view of the above problems, the purpose of this utility model is to provide a portable hand-held pressure tester with high environmental applicability, high precision and low cost, which can quickly test and record the pressure value of the gearbox in real vehicles.

In order to achieve the above object, the utility model adopts the following technical solutions: a portable hand-held pressure tester, which is characterized in that it includes four current pressure sensors, four cable channel interfaces, a signal conditioning module, and an A/D conversion module , a data processing module, a central processing unit, a data storage module, a human-computer interaction module, and a battery energy module; the pressure signals collected by the four current pressure sensors are respectively input into the signal conditioning module through the four cable channel interfaces After the pressure signal is converted into a DC voltage signal, the A/D conversion module is input into the data processing module for range and unit conversion, the converted signal is input into the central processing unit, and the processed signal is stored in In the data storage module; the output end of the central processing unit is also connected to the human-computer interaction module for data display, and the input end of the central processing unit is also connected to the battery energy module.

The signal conditioning module includes four low-pass filter modules, four current conversion modules and four voltage isolation modules, and the current signal output by each of the amperometric pressure sensors is input to the Filtering processing is performed in the low-pass filter module; the output end of each of the low-pass filter modules is connected to the input end of each of the current conversion modules, and the current conversion module converts the current signal output by the amperometric pressure sensor into a voltage After the signal is input into the voltage isolation module for isolation processing, the output end of the voltage isolation module is connected to the input end of the A/D conversion module.

The output end of the battery energy module is connected to a power indicator light, and the input end of the battery energy module is connected to a charging interface.

The central processing unit uses a 32-bit processing chip, the A/D conversion module uses a 12-bit high-speed analog-to-digital conversion chip, and the data storage module uses a pluggable SD memory card.

The four cable channel interfaces all adopt loose waterproof aviation joints with threaded connections.

Each of the current pressure sensors adopts a pressure sensor with a maximum pressure measurement of 60 MPa and a pressure measurement temperature of 150 degrees.

Because the utility model adopts the above technical scheme, it has the following advantages: 1. Since the utility model adopts four current type pressure sensors and four cable channel interfaces, the collected pressure signal is passed through the voltage isolation module and the voltage isolation module in the signal conditioning module. After processing by the data processing module, the signal anti-interference ability is improved, which is convenient for the installation of real vehicle sensors. 2. Since the current pressure sensor of the utility model adopts a pressure sensor with a maximum pressure measurement of 60MPa and a pressure measurement temperature of 150 degrees, it can fully adapt to the high temperature and high pressure test environment of the vehicle gearbox. 3. The battery energy module adopted by the utility model not only supplies power to the portable hand-held pressure tester, but is also responsible for supplying power to the current pressure sensor. During the test, it is not necessary to provide additional power for the current pressure sensor, which improves the convenience of use . 4. Since the utility model supports up to four-channel pressure data collection, and the sampling interval is 5 milliseconds, it meets the requirement of multi-channel simultaneous pressure collection of the gearbox. 5. The utility model integrates functional modules such as signal collection, data processing, analysis and display alarm, etc., with compact structure, simple human-computer interaction operation, and strong portability. Therefore, the utility model can be widely used in online detection and data recording of various high-power vehicle gearbox hydraulic systems.

Description of drawings

Fig. 1 is the overall structural representation of the utility model;

Fig. 2 is a schematic structural diagram of a signal conditioning module of the present invention;

Fig. 3 is a schematic diagram of the operation flow when the utility model is in use.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is described in detail.

As shown in Figure 1, the utility model includes four current type pressure sensors 1, four cable channel interfaces 2, a signal conditioning module 3, an A/D conversion module 4, a data processing module 5, a central processing unit 6, and a data storage module 7. Human-computer interaction module 8, battery energy module 9, power indicator light 10 and charging interface 11.

The pressure signals collected by the four current pressure sensors 1 are respectively input into the signal conditioning module 3 through the four cable channel interfaces 2, and after the pressure signals are converted into DC voltage signals between 0 and 10V, they are input through the A/D conversion module 4 The range and the unit conversion are performed in the data processing module 5 to make it represent the size of the oil pressure in the form of MPa. The converted signal is input to the central processing unit 6 for processing, and the processed signal is stored in the data storage module 7, and the output terminal of the central processing unit 6 is also connected to the human-computer interaction module 8 for data display; the input terminal of the central processing unit 6 is also Connect the battery energy module 9. Wherein, the output end of the battery energy module 9 is connected to the power indicator light 10 for prompting charging, and the input end is connected to the charging interface 11. Blinking at an interval of 0.5 seconds, prompting the user to use the charging interface 11 to charge.

In the above embodiment, the central processing unit 6 uses a 32-bit processing chip, and the A/D conversion module 4 uses a 12-bit high-speed analog-to-digital conversion chip to ensure that the single-channel processing rate is not lower than 1K. The data storage module 7 adopts a pluggable SD memory card with a maximum capacity of 8G, which meets the data storage requirements of the actual vehicle test.

In each of the above-mentioned embodiments, four cable channel interfaces 2 are arranged side by side on the upper panel of the portable hand-held pressure tester of the present utility model. Aviation connectors to ensure that no virtual connections occur during the test.

In the above-mentioned embodiments, the human-computer interaction module 8 includes a color display screen and 4X4 buttons. By controlling the buttons, the functions of selecting display channels, data storage, fault code query, historical data playback and switching on and off can be realized.

In the above-mentioned embodiments, each current pressure sensor 1 adopts a pressure sensor with a maximum pressure measurement of 60 MPa, and its pressure measurement temperature reaches 150 degrees.

As shown in Figure 2, the signal conditioning module 3 of the present invention includes four low-pass filter modules 31, four current conversion modules 32 and four voltage isolation modules 33, and the current signal output by each current type pressure sensor 1 is passed through respectively A cable channel interface 2 is input to the low-pass filter module 31 for filtering and removal of interference signals. The output end of each low-pass filter module 31 is respectively connected to the input end of each current conversion module 32, and the current conversion module 32 converts the current signal output by the amperometric pressure sensor 1 into a voltage signal between 0 and 10V, and finally each The voltage signals all enter the same voltage isolation module 33 for mutual isolation processing to avoid mutual interference. The output end of the voltage isolation module 44 is connected to the input end of the A/D conversion module 4, and the isolated voltage signal enters the A/D conversion module 4 to be converted into a digital signal.

In the above-mentioned embodiment, each low-pass filter module 31, each current conversion module 32 and each voltage isolation module 33 are uniformly designed on one integrated circuit board, which reduces the actual volume of the signal conditioning module 3 and ensures the portable hand-held function of the utility model. The miniaturization and portability of the pressure tester improves the portability during use.

As shown in Figure 3, when the utility model is in use, its use steps are as follows:

(1) Install four current type pressure sensors, connect four current type pressure sensors and the portable hand-held pressure tester of the present utility model with a high-temperature shielded cable, check the battery power of the portable hand-held pressure tester;

(2) Start the portable hand-held pressure tester, set the normal and abnormal limit value range of each connected current pressure sensor, and start the test object;

(3) Carry out the shifting operation of the vehicle gearbox, observe the signals of each current pressure sensor during the shifting process, if the signal is normal, then automatically store the data, and if the signal is abnormal, store the fault data.

(4) After completing the data recording, turn off the portable handheld pressure tester and take out the SD memory card that can be plugged.

The above-mentioned embodiments are only used to illustrate the utility model, and the structure and connection mode of each component can be changed. The improvements and equivalent transformations should not be excluded from the protection scope of the present utility model.

Claims (9)

1. A portable hand-held pressure tester, characterized in that: it includes four current pressure sensors, four cable channel interfaces, signal conditioning module, A/D conversion module, data processing module, central processing unit, data storage module, human-computer interaction module and battery energy module; The pressure signals collected by the four current pressure sensors are respectively input into the signal conditioning module through the four cable channel interfaces, and after the pressure signals are converted into DC voltage signals, they are input into the A/D conversion module. The range and unit conversion is performed in the data processing module, the converted signal is input into the central processing unit, and the processed signal is stored in the data storage module; the output terminal of the central processing unit is also connected to the human-computer interaction The module performs data display, and the input end of the central processing unit is also connected to the battery energy module. 2. A kind of portable hand-held pressure tester as claimed in claim 1, it is characterized in that: said signal conditioning module comprises four low-pass filter modules, four current conversion modules and four voltage isolation modules, each of which The current signals output by the amperometric pressure sensors are respectively input into the low-pass filter module for filtering processing after passing through one of the cable channel interfaces; the output ends of each of the low-pass filter modules are respectively connected to each of the current conversion modules At the input end, the current conversion module converts the current signal output by the current type pressure sensor into a voltage signal, and then inputs it into the voltage isolation module for isolation processing, and the output end of the voltage isolation module is connected to the A/D conversion module input. 3. A portable hand-held pressure tester according to claim 1, characterized in that: the output end of the battery energy module is connected to a power indicator light, and the input end of the battery energy module is connected to a charging interface. 4. A kind of portable hand-held stress tester as claimed in claim 1 or 2 or 3, is characterized in that: described central processing unit adopts 32 processing chips, and described A/D conversion module adopts 12 high-speed modulus A conversion chip, the data storage module adopts a pluggable SD memory card. 5. A portable hand-held pressure tester as claimed in claim 1, 2 or 3, characterized in that: said four cable channel interfaces all adopt loose waterproof aviation joints with threaded connections. 6. A portable hand-held pressure tester as claimed in claim 4, characterized in that: said four cable channel interfaces all adopt loose waterproof aviation joints with threaded connections. 7. A kind of portable hand-held pressure tester as claimed in claim 1 or 2 or 3 or 6, it is characterized in that: each described amperometric pressure sensor adopts the highest pressure measurement reaches 60MPa, the pressure measurement temperature reaches 150 degrees Pressure Sensor. 8. A portable hand-held pressure tester as claimed in claim 4, characterized in that: each of the current pressure sensors adopts a pressure sensor with a maximum pressure measurement of 60 MPa and a pressure measurement temperature of 150 degrees. 9. A portable hand-held pressure tester as claimed in claim 5, characterized in that: each of the current pressure sensors adopts a pressure sensor with a maximum pressure measurement of 60 MPa and a pressure measurement temperature of 150 degrees.

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