RU2423264C1 - Miniature drive motor - Google Patents

Abstract

FIELD: transport. ^ SUBSTANCE: invention relates to electrified railway transport and may be used to drive various actuators, primarily, to control overhead contact circuit interrupters. Proposed drive comprises housing, motor coupled via mechanical converter with drive output shaft that serves to connect overhead contact circuit interrupter drive element. Motor and mechanical converter are arranged in said housing, while mechanical converter proper is made up of geared motor with its input shaft coupled with motor output shaft. Overhead contact circuit interrupter drive element is made up of rotary lever and half-coupling. Three-phase induction motor makes drive motor. Besides, proposed drive comprises drive rotational direction electronic switch arranged in housing. ^ EFFECT: expanded operating performances, simplified design and higher reliability. ^ 4 dwg, 6 cl

Description

The invention relates to devices designed to actuate various actuators, whose work is based on movement, and can be used mainly for controlling disconnectors of the contact network of electrified railways.

Known screw drives are used to control such actuators, for example, a helical gearbox, in the housing of which there is a gear sector mounted on the drive shaft, interacting with a gear rack and movably connected through a nut to the screw, the axis of the screw being aligned with the dividing line of the teeth of the rail and a notch was made in the gear sector dividing the ring gear into two rows (USSR copyright certificate No. 400765, F16K 31/50, publication 1973).

Known screw gearbox containing a gear sector located in the housing, mounted on the shaft, a double-row rail interacting with the sector, a screw connected movably to the rail by means of a nut, the axis of the screw being aligned with the dividing line of the teeth of the rail. In addition, there is an additional shaft located in the cavity of the first shaft, and a gear sector mounted on this shaft, and the rail is made with straight sections in each row, located so that when one gear sector is out of engagement, the other is engaged (copyright certificate USSR No. 1610176, F16K 31/50, publication 1990).

These devices have a complex structure, the use of gear racks makes it difficult to care for them, reduces reliability and makes it difficult to use rotary actuators to actuate.

A number of drives are known that use rocker mechanisms for coupling a screw pair and an element directly acting on the actuator, for example, a screw motor drive containing a shaft installed in the housing, acting on one end with actuators and using a rocker mechanism mounted on it that interacts with the screw nut , the screw of which is mounted on the supports in the said housing, one end of the screw is connected to the motor acting on the drive, and the handle p is fixed to the other LfTetanus control (№ British Patent 953,824, F16K 31/50, Publication 1964).

The configuration of the rocker mechanism in the specified known device causes difficulties in its manufacture and leads to a decrease in the reliability of the device as a whole.

Known drive rotary locking bodies of pipe fittings, comprising a housing, an electric motor, a gearbox, a screw pair, a link secured to the drive link of the locking element, the electric motor through a gearbox connected to the pair screw, and the nut provided with a finger placed in the slot of the fork of the backstage (USSR Copyright Certificate No. 1583693, F16K 31/00, publication 1988).

Known screw motor drive, which contains a housing, a rotation motor connected through a gearbox to a screw of a screw pair, a link, a slider and means for braking the rotation of the screw at the extreme positions of the slider. The housing has two guide grooves. The pins of the slide are made with the possibility of interaction with the grooves of the forks of the wings and the grooves of the body. A cylindrical cavity is made in the slider, the axis of which is perpendicular to the axis of the pins and the axis of the screw. The screw pair nut is made in the form of a cylinder with an axis perpendicular to the axis of its threaded hole. The nut is placed in the cavity of the slider with the possibility of relative rotation and the formation of axial play (Russian patent No. 2113646, F16 31/00, publication 1998).

The design of the wings in the form of a fork can cause it to slide off the slide, which reduces the reliability of the device. Assembly of the drive, replacement of parts and its testing are also difficult.

The closest technical solution for actuating contact network disconnectors is a screw motor drive containing a housing, an engine connected to a screw of a screw pair, the nut of which is located in a slider having trunnions on opposite sides, some of which are located in the guides of the housing, and others in the grooves of the respective wings connected to the drive element. It is equipped with bushings located on the trunnion parts, and the bushings interacting with the wings are made with collars on the side of the slide and their outer diameter is smaller than the outer diameter of the bushings interacting with the guides of the housing, and the grooves of the wings are closed (Russian patent No. 2172690, B61L 5 / 00, F16K 31/50, publication 2001).

The disadvantages of the specified screw motor drive are:

- the movement with two parallel working scenes implies the manufacture of parts very precise with a high frequency class;

- during the back and forth motion of the backstage there are two critical positions (the so-called dead points) at which the angle of inclination to the threaded screw leading into the movement of the backstage screw is small, which leads to the need to increase the torque to start the backward movement of the backstage;

- the movement of the bracket inside the wings, and the threaded nut on the drive screw due to the large contact area also leads to large power losses on the output shaft;

- it is necessary to use a powerful (3.2 kV) and heavy (20 kg) electric motor;

- large mass of the drive (PDV - 44 kg);

- a large area of the rubbing surface leads to significant condensation inside the drive, which freezes in the cold season, which complicates the operation of the drive;

- the need for constructive refinement for different versions of the disconnectors of the contact network of electrified railways.

The technical result to which this invention is directed is to eliminate or significantly reduce the above disadvantages, as well as expanding functional capabilities while simplifying the design, reducing weight and dimensions and increasing reliability, including in winter and in the presence of a sharp difference in climate temperatures. The design should provide a significant expansion of the range of maximum effort at the end of the lever of the output shaft of the drive at the moment of contact of the disconnector when it is turned on.

The specified technical result is achieved by the fact that in the motor drive, comprising a housing, the motor is connected through a mechanical converter with an output shaft of the drive for connecting the drive element of the contactor disconnector, the motor and the mechanical converter are placed in the housing, and the mechanical converter is made in the form of a motor - a reducer connected to the output shaft of the engine by its input shaft, and a communication unit of the output shaft of the gear motor with the output shaft of the drive.

In addition, the communication node of the output shaft of the gear motor can be made in the form of a rotary lever of the output shaft of the gear motor connected by a link to the intermediate lever of the output shaft of the drive.

In addition, the motor gearbox can be made in the form of a four-stage gearbox with a parallel arrangement of the axes of the gears.

In addition, the drive element of the contact network disconnector can be made in the form of a drive rotary lever or a coupling half.

In addition, a three-phase asynchronous electric motor with a capacitor start from a single-phase circuit can be used as a motor.

In addition, an electronic switch of the direction of rotation of the drive, a normally closed safety switch from unauthorized opening of the case, and a terminal block for connecting to the electric control circuits of the drive can be inserted into it.

The invention is illustrated by drawings.

Figure 1 - layout of the drive motor small-sized;

figure 2 is a view of the communication node of the output shaft of the gear motor with the output shaft of the drive;

figure 3 - installation diagram of the drive for the disconnector of contact networks with a horizontal output shaft;

figure 4 - installation diagram of the drive for the disconnector of contact networks with a vertical output shaft.

The small-sized motor drive contains a housing 1, in which the motor 2 is located, connected through a mechanical converter made in the form of a gear motor 3, connected to the output shaft of the engine 4 by its input shaft 5. The output shaft 6 of the drive is used to connect the drive element of the contact network disconnector. The communication node of the output shaft of the gear motor with the output shaft of the drive is made in the form of a rotary lever 7 of the output shaft of the gear motor connected by a rod 8 with an intermediate lever 9 of the output shaft of the drive.

The motor gearbox is made in the form of a four-stage gearbox with parallel arrangement of the axes of the gears 10, the drive element of the contact network disconnector is made in the form of a drive rotary lever 11 (or half-coupling 11a). An electronic switch 12 of the drive rotation direction, a normally closed safety switch 13 against unauthorized opening of the housing, and a terminal block 14 for connecting to the electric circuits (not shown) of the drive control are placed in the housing. As a motor, a three-phase asynchronous electric motor with a capacitor start from a single-phase circuit is used. The housing is closed by a cover 15, which can be removed, for example, to attach the handle 16 manual control.

Installation of the disconnector type RKZH - 3.3 / 4000 with a horizontal shaft and a small motor drive and checking their operation is carried out in accordance with Fig. 3, and the disconnector type RD-35/1000 with a vertical shaft and a small motor drive - in accordance with Fig. four.

The recommended mounting sequence for the disconnector with the actuator of FIG. 3 is as follows:

disconnector 26 is installed in the on position and secured to the bracket 18 mounted on the support 17 through insulating gaskets 24, fixed through the insulating bushings 29 to the housing 1 to the bracket 19 attached to the support 17 with clamps 27, the plug 22 is mounted on the actuating rotary lever 11 (Fig. .2) output shaft. Using the handle 16 for manual control of the drive set the motor drive to the "On" position in accordance with figure 3. The required length of the rod of the disconnector 21 is measured, and a rod with an insulating insert 25 and with a welded plug 22 at the opposite end is made for the connected length to the disconnector lever, and then a rod 21 is installed between the drive and the disconnector. Connect the ground terminal of the drive grounding conductor 20 with an external ground loop, connect the control cable to the terminal block 14 and close the cover 15.

The recommended mounting sequence for the disconnector with the actuator of FIG. 4 is as follows:

disconnector 26 is installed in the on position and fixed to the bracket 18, the housing 1 is fixed to the bracket 19 attached to the support 17 by the collar 27. Using the manual control handle 16, the motor drive is set to the “On” position in accordance with FIG. 4, set to the coupling half of the coupling 11a adjusting insert 28, measure the required length of the shaft of the disconnector 21, make the specified shaft from a pipe with an internal diameter of 30 mm, install it between the drive motor small-sized and the disconnector 26, with this, the upper end of the shaft should be welded to the shaft of the rotary column of the disconnector, and the lower end of the shaft to the flange of the adjusting insert 28. Connect the drive ground terminal with grounding conductor 20 with an external ground loop, connect the control cable to the terminal block 14 and close the cover 15.

To simplify the installation of PDM drives in existing areas when replacing drives of an old design (UMP, PDJ, PDV) complete with a PDM drive, an optional adapter is supplied with an adapter bracket without changing the design of the PDM.

The device operates as follows.

To actuate the drive, the motor 2 is turned on, which drives the gear motor 3 with its output shaft, the output shaft of which, through the rotary lever 7, connected by the rod 8 with the intermediate lever 9, transfers increased force to the output shaft of the drive, which is then converted into translational movement of the disconnector rod with a horizontal output shaft or rotary movement of the disconnector shaft with a vertical output shaft. In this case, the areas of rubbing surfaces and the contact area of moving parts are minimized. The rotation of the output shaft of the drive is carried out in two plain bearings (bronze bushings), the rotation of the axes of the gearbox is carried out in rolling bearings (ball bearings).

To prevent the drive motor from starting when the cover 15 is removed, a switch 13 is included in the drive control circuit, the contacts of which open when the casing is removed.

The proposed technical solution provided the following advantages of the drive compared to analogues:

- lack of a rocker mechanism;

- reducing the area of rubbing parts due to the gear 4-speed gearbox with a small module;

- lack of critical positions (blind spots) of the drive mechanism;

- the same torque in any position of the gearbox and the rotary lever;

- the use of a low-power small-sized engine leads to a significant reduction in the weight and dimensions of the drive (PDM weight - 19 kg);

- a small surface of the drive parts in contact with the movement reduces the amount of condensate inside the drive, which eliminates its freezing in the cold season and ensures stable operation of the drive at any time of the year.

Thus, a technical result is achieved, which is the elimination or significant reduction of the above disadvantages of analogues and prototype, as well as the expansion of functionality while simplifying the design, reducing weight and dimensions and increasing reliability, including in winter and in harsh climatic temperature difference. The design provides a significant expansion of the range of creating maximum effort at the end of the lever of the output shaft of the drive at the moment of contact of the disconnector when it is turned on.

Claims (6)

1. Small-sized motor drive, comprising a housing, an engine connected through a mechanical converter to an output drive shaft for connecting a drive element of a contact network disconnector, characterized in that the engine and the mechanical converter are located in the housing, and the mechanical converter is made in the form of a motor- a reducer connected to the output shaft of the engine with its input shaft, and a communication node of the output shaft of the gear motor with the output shaft of the drive. 2. The drive according to claim 1, characterized in that the communication node of the output shaft of the gearmotor is made in the form of a rotary lever of the output shaft of the gearmotor connected by a link to the intermediate lever of the drive output shaft. 3. The drive according to claim 1, characterized in that the motor gearbox is made in the form of a four-stage gearbox with a parallel arrangement of the axes of the gears. 4. The drive according to claim 1, characterized in that the drive element of the contactor disconnector is made in the form of a drive rotary lever or a coupling half. 5. The drive according to claim 1, characterized in that as a motor using a three-phase asynchronous electric motor with capacitor starting from a single-phase circuit. 6. The drive according to claim 1, characterized in that the electronic switch of the direction of rotation of the drive, a normally closed safety switch from unauthorized opening of the case, and a terminal block for connecting to the electric control circuits of the drive are inserted into it.

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