RU213235U1 - Low voltage cabinet drawer drive mechanism - Google Patents

Abstract

The utility model relates to the field of electrical engineering and can be used in withdrawable units of a low-voltage complete device (cabinet) to move the withdrawable unit to the required positions: "Disconnected", "Test", "Connected". The technical result is an increase in the reliability of the device. The technical result is achieved by the fact that inside the housing of the drive mechanism of the low-voltage cabinet drawer, a worm shaft is fixed in the holes of the side walls, on the front end part of which a two-stage gear drive gear with a worm shaft control socket is fixed. The driven wheel of the second stage of the two-stage gear train is made with a rotation angle limitation and is mounted on the driven shaft of the two-stage gear train. The fixing unit contains a lever fixed on the body, interacting with the control drive rod of the automatic switch with an external handle, and a protective shutter connected with the lever, blocking access to the worm shaft control socket and contacting the slotted disk, rigidly fixed on the driven shaft of the two-stage gear. 1 w.p. f-ly, 5 ill.

Description

The utility model relates to the field of electrical engineering and can be used in withdrawable units of a low-voltage complete device (cabinet) to move the withdrawable unit to the required positions: "Disconnected", "Test", "Connected".

A drive mechanism for a draw-out unit of a low-voltage complete device (RU145041U1) is known, containing a drive assembly consisting of a housing with a shaft placed inside with a worm groove interacting with a stop, and a drive fixation assembly interacting with the shaft, while grooves are made on the rear end of the drive shaft to block the rotation of the shaft, the drive fixing unit contains a rod with protrusions, a lock release button and a return spring, and the rod is mounted on the drive housing with the possibility of longitudinal movement, a lock release button is fixed at one end of the rod, extending beyond the front panel of the drawer, at the other it is made the first protrusion interacting with the corresponding groove on the rear end of the drive shaft, the return spring is fixed on the drive housing and acts on the end of the rod with the first protrusion, and in addition to it (the drive mechanism) a circuit breaker blocking assembly is introduced, containing a bracket and a limiter, and a sector located between them interacting with the circuit breaker shaft, while the sector is mounted on the bracket with the possibility of rotation in a vertical plane when the circuit breaker is turned on and off and the possibility of interacting with the second protrusion of the rod, the limiter and the bracket have a cutout for entering the second protrusion of the stem in the intermediate position of the withdrawable block. On the front end part of the drive shaft facing the front panel of the withdrawable unit, a position indicator of the withdrawable unit can be made.

The disadvantage of the known device is not clear fixation of the retractable unit in the desired position. If the shaft is accidentally rotated and the lock button is not released, deformation of the protrusion of the rod may occur, which will subsequently lead to the inoperability of the drive.

As a prototype, the drive mechanism of the drawer of the low-voltage complete device (RU160092U1), containing the drive unit, consisting of a housing with a shaft placed inside with a worm groove, interacting with the stop, a fixation unit interacting with the shaft, a locking unit, is selected, while on the body of the drive unit the inserted bracket is fixed, made of L-shaped form with a longitudinal groove for moving the blocking unit up and down, blind holes are made on the front end part of the drive unit shaft, the fixation unit interacting with the shaft is installed on the front wall of the drive unit housing and contains a sleeve, inside which contains a spring and a core interacting with the corresponding blind hole of the drive unit shaft, and on the rear wall of the drive unit body there is an inserted stop interacting with a protrusion made on the rear end of the shaft, the blocking unit is made in the form of a U-shaped plate bent with locking elements and paws at the end x, in the holes of which guides with springs are installed, and in its upper part in the longitudinal hole a lever is fixed with the help of fasteners.

In the selected prototype, the shortcomings of the analog (RU145041U1) are partially eliminated, but at the same time, the prototype design is characterized by high technical complexity of a number of parts (shaft of the drive unit, fixation unit) and low maintainability.

The task (technical problem) of the utility model was to simplify the device by using the maximum number of standardized and unified parts with high maintainability and replaceability.

The technical result is an increase in the reliability of the device.

This task is solved by the drive mechanism of the drawer of the low-voltage cabinet, containing the drive unit, consisting of a housing with a worm shaft placed inside, a fixation unit and a blocking unit, in which, according to the proposal, the unit for blocking the rotation of the worm shaft at the required extreme points is made in the form of a two-stage gear mounted on the housing of the drive mechanism, while the drive gear of the gear is mounted on the front end of the worm shaft, and the driven wheel of the second stage of the gear is made with a rotation angle limitation, the fixation unit contains a lever mounted on the rod of the circuit breaker and associated with a protective shutter, closing access to the worm shaft control socket and blocking the rotation of the driven wheel of the second gear stage when the circuit breaker is on.

It is advisable to install on the device a means for indicating the position of the drawer, made, for example, from a drive gear mounted on the intermediate shaft of the two-stage transmission of the blocking unit and the driven wheel, on which a plate with a graphic designation of the movement positions of the drawer is fixed.

The utility model is illustrated by drawings.

In FIG. 1 shows the external view of the low-voltage cabinet drawer drive mechanism from the front side.

In FIG. 2 shows the external view of the drive mechanism of the drawer of the low-voltage cabinet from the rear side without the fixation unit.

In FIG. 3 shows the external view of the drive mechanism of the drawer of the low-voltage cabinet from the front side with the locking unit.

In FIG. 4 shows the fixation assembly.

In FIG. 5 shows the sector with the grooves of the fixation unit.

The drive mechanism of the drawer of the low voltage cabinet is attached to the base of the drawer and ensures its longitudinal movement to the required positions. The drive mechanism consists of a housing 1, inside which a worm shaft 2 is fixed in the holes of the side walls. The worm shaft interacts with the worm rack 3, which is fixed on the stationary part of the cabinet (not shown). On the front end part of the worm shaft 2, a drive gear 4 of a two-stage gear with an internal hole in the form of a hexagon (worm shaft control socket) is fixed.

On the intermediate shaft 5 are installed: the driven wheel 6 of the first stage of a two-stage transmission, the drive gear 7 of the second stage, the gear 8 of the display means.

On the driven shaft of the two-stage transmission, the following are installed: the driven wheel 9, the driven wheel 10 of the indication means with platinum 11 with a graphic designation of the positions of movement of the sliding block.

The rotation of the driven wheel 9 of the second stage is limited by an angle of 120 degrees, the enlarged tooth on the wheel 9 can serve as a limiter.

The locking unit ensures blocking of the switching on of the circuit breaker in the intermediate positions of the drawer and blocking of the movement of the drawer when the circuit breaker is on. The fixation unit contains the following elements fixed on the prefabricated body 1:

- lever 12 interacting with the rod 13 of the control drive of the circuit breaker with an external handle 14 and a protective shutter 15 associated with the lever 12;

- disk 16 with grooves, rigidly fixed on the driven shaft of a two-stage gear. 2.3 node 2 and synchronously rotating with it.

The device works as follows.

When the circuit breaker is turned on by turning the stem 13 with the handle 14, the lever 12 acts on the shutter 15, and the shutter 15 blocks access to the worm shaft control socket 2 (internal hexagonal hole of the drive gear 4 of the two-stage gear transmission) and simultaneously comes into contact with the disk 16 in one of its three possible positions (Fig. 5).

If it is necessary to extend the block (case 1), the circuit breaker is turned off by turning the stem 13 with the handle 14. A key (not shown) is inserted into the worm shaft control socket, by turning which the worm shaft 2 rotates and, accordingly, the retractable block moves.

The means of indicating the position of the drawer provides visual control of the position of the drawer inside the cabinet (corresponding pictogram on plate 11).

Installation of the withdrawable unit in place is carried out by rotating the shaft 2 in the other direction with the circuit breaker turned off.

Prototypes of the proposed device showed the smoothness and failure-free operation of all elements, accessibility and ease of maintenance.

Claims (2)

1. The drive mechanism of the sliding block of the low-voltage cabinet, consisting of a housing with a worm shaft located inside, a fixation unit, characterized in that a worm shaft is fixed inside the housing in the holes of the side walls, on the front end part of which a two-stage gear drive gear with a worm control socket is fixed shaft, the driven wheel of the second stage of the two-stage gear transmission is made with a rotation angle limitation and is installed on the driven shaft of the two-stage gear transmission, the fixation unit comprises a lever fixed on the body, interacting with the rod of the control drive of the circuit breaker with an external handle, and a protective shutter associated with the lever, blocking access to the worm shaft control socket and in contact with a slotted disk rigidly mounted on the driven shaft of a two-stage gear. 2. The drive mechanism according to claim 1, characterized in that it contains a means for indicating the position of the sliding block, made of a gear of the indicating means mounted on the intermediate shaft of a two-stage gear, a driven wheel of the indicating means with a plate with a graphic designation of the positions of movement of the sliding block.

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