Auxiliary switch drive mechanism for hydraulic operating mechanism

Abstract

The utility model provides a kind of auxiliary switch drive mechanism for hydraulic operating mechanism belongs to drive mechanism structure technical field, by the prior art guide block sliding slot drive pre-stage crank arm+shaft pin+roller structure is changed into connecting plate and crank arm combination, with piston rod and guide block linear motion drive connecting plate crank arm assembly around spline shaft does variable radius rotation, change rotary radius by telescopic motion, reduce overall size, meet the use requirement of existing limited space, solve the long-stroke hydraulic operating mechanism auxiliary switch drive mechanism component interference problem, and through post-stage transmission component, realize auxiliary switch normal transmission and switching function;Connecting plate one end is hinged with guide block by shaft pin screw, the overall structure of connecting plate long hole sliding slot and shaft pin and roller assembly sliding and rolling installed on crank arm, reduce transmission friction resistance.

Description

Technical Field

[0001] This utility model belongs to the field of transmission mechanism structure technology, specifically relating to an auxiliary switch transmission mechanism for a hydraulic operating mechanism. Background Technology

[0002] High-voltage circuit breakers are the most important control and protection devices in power systems. They mainly consist of two parts: the circuit breaker body and the operating mechanism. The hydraulic operating mechanism is one of the commonly used driving elements of high-voltage circuit breakers, and the auxiliary switch and its transmission mechanism are the main components of the hydraulic operating mechanism.

[0003] The switching of the auxiliary switch in a conventional hydraulic operating mechanism is achieved by the linear motion of the main piston rod of the hydraulic operating mechanism, which drives the front crank arm pin through the guide block groove fixed to the end of the piston rod, converting the linear motion into rotational motion. The auxiliary switch shaft is then rotated through a combination transmission mechanism of spline shaft, crank arm and connecting rod to achieve the switching.

[0004] Since the auxiliary switch angle is essentially fixed, for hydraulic operating mechanisms with different working strokes, the main method is to adjust the length of the front-stage crank arm to maintain a relatively fixed rotation angle at the rear end of the transmission mechanism, thus meeting the normal switching angle requirements of the auxiliary switch. For hydraulic operating mechanisms with longer working strokes, to ensure a relatively fixed auxiliary switch switching angle, the standard design must consider lengthening the drive crank arm and the guide block at the piston rod end to extend the slide groove. However, due to the limited internal space of the connecting flange, lengthening the front-stage crank arm and guide block will interfere with the operating mechanism's connecting flange, preventing the auxiliary switch from functioning correctly. Furthermore, as the working stroke increases, existing solutions, such as lengthening the front-stage crank arm, reach a certain limit, leading to increased crank arm swing amplitude and elastic deformation. High-speed piston rod movement can easily cause the crank arm pin to dislodge from the groove, resulting in operational malfunctions. Utility Model Content

[0005] The purpose of this utility model is to provide an auxiliary switch transmission mechanism for hydraulic operating mechanisms, so as to overcome the technical problem that existing auxiliary switch transmission mechanisms require lengthening the drive crank arm for hydraulic operating mechanisms with large working strokes, which causes interference between the drive crank arm and the connecting flange.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] An auxiliary switch transmission mechanism for a hydraulic operating mechanism includes a front-stage transmission assembly, a splined shaft, and a rear-stage transmission assembly;

[0008] The pre-drive assembly includes a connecting plate, one end of which is fixed with a guide block, and a piston rod is mounted on the guide block;

[0009] The connecting plate has a sliding groove, and one end of the first crank arm is slidably connected to the connecting plate through the sliding groove. The other end of the first crank arm is fixed on the spline shaft.

[0010] The rear transmission assembly includes a second crank arm with one end fixed to a splined shaft, a connecting rod assembly with one end fixed to the second crank arm, and a third crank arm installed at the other end of the connecting rod assembly.

[0011] Furthermore, the connecting plate has an opening at one end where it connects to the guide block, and a threaded pin is installed in the opening. The connecting plate is connected to the guide block through the threaded pin.

[0012] Furthermore, one side of the guide block has a threaded hole for inserting a threaded pin.

[0013] Furthermore, the first crank arm has a pin hole at one end that is slidably connected to the connecting plate, and a spline hole at the other end of the first crank arm.

[0014] Furthermore, the first crank arm is connected to the slide groove of the connecting plate by a first pivot pin.

[0015] Furthermore, a roller is provided between the first pivot pin and the inner wall of the connecting plate groove.

[0016] Furthermore, a bushing for isolating the connecting plate and the first crank arm is provided on the outside of the first pivot pin.

[0017] Furthermore, elastic retaining rings are provided at both ends of the first shaft pin.

[0018] Furthermore, the second crank arm and the connecting rod assembly, as well as the third crank arm and the connecting rod assembly, are connected by a second pivot pin.

[0019] Furthermore, the third crank arm has two parts.

[0020] Compared with the prior art, the present invention has the following beneficial technical effects:

[0021] This utility model provides an auxiliary switch transmission mechanism for a hydraulic operating mechanism. It replaces the existing guide block groove drive front-stage crank arm + shaft pin + roller structure with a combination of connecting plate and crank arm. The front-stage transmission assembly, which is composed of connecting plate, crank arm, shaft pin, etc., forms a telescopic structure. With the linear movement of piston rod and guide block, it drives the connecting plate and crank arm assembly to rotate with a variable radius. This solves the problem of component interference caused by the increased turning radius of long-stroke auxiliary switch transmission components. Through the rear-stage transmission assembly, the normal transmission and switching functions of the auxiliary switch are realized.

[0022] Preferably, the first pivot pin and roller assembly mounted on the first crank arm reduces the transmission friction resistance between the first crank arm and the connecting plate.

[0023] Preferably, a bushing is provided between the connecting plate and the first crank arm to achieve isolation between the two. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of an auxiliary switch transmission mechanism for a hydraulic operating mechanism in an embodiment of this utility model;

[0025] Figure 2 A top view of an auxiliary switch transmission mechanism for a hydraulic operating mechanism in an embodiment of this utility model.

[0026] The components are as follows: I. Front-stage transmission assembly; II. Rear-stage transmission assembly; III. Auxiliary switch assembly; 1. Piston rod; 2. Guide block; 3. Threaded pin; 4. Connecting plate; 5. Bushing; 6. First crank arm; 7. First shaft pin; 8. Roller; 9. Splined shaft; 10. Second crank arm; 11. Connecting rod assembly; 12. Second shaft pin; 13. Crank arm; 14. Connecting plate; 15. Auxiliary switch; 16. Bend plate; 17. Connecting flange. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0028] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0030] Explanation of related terms

[0031] Hydraulic operating mechanism: As a type of operating mechanism for high-voltage circuit breakers, the hydraulic operating mechanism is also the power source of the circuit breaker. It is an operating mechanism that uses hydraulic oil as the working medium to transmit power.

[0032] High-voltage circuit breakers: As important control and protection components of high-voltage power systems, they are mechanical switching devices capable of closing, carrying, and interrupting current under normal circuit conditions, and capable of closing and carrying and interrupting current under abnormal circuit conditions within a specified time.

[0033] Closing: refers to the operation or state of controlling the operating mechanism to change the circuit breaker or switch from the open position to the closed position, thereby connecting the circuit and allowing current to flow.

[0034] Opening: refers to the operation or state of switching a circuit breaker or switch from the closed position to the open position by controlling the operating mechanism, thereby disconnecting the circuit and preventing current from flowing.

[0035] Working stroke: refers to the displacement of the piston rod or main crank arm of the operating mechanism from the open position to the closed position.

[0036] Auxiliary switches are part of the main switches and are configured in high-voltage or medium-voltage circuit breakers, disconnectors, and other power equipment as auxiliary components for secondary control circuits, including opening, closing, signal control, and interlocking protection.

[0037] Transmission mechanism: A component or mechanism that transmits power from one part of a machine to another, causing the machine or its parts to move or operate.

[0038] In one embodiment of this utility model, such as Figure 1 As shown, an auxiliary switch transmission mechanism for a hydraulic operating mechanism is provided, including a front-stage transmission assembly and a rear-stage transmission assembly respectively fixed on a splined shaft 9:

[0039] The front-stage transmission assembly includes a piston rod 1, a guide block 2, a connecting plate 4, and a first crank arm 6. Specifically, the piston rod 1 is connected to the guide block 2, the guide block 2 is installed on the outer end of the connecting plate 4, a sliding groove is opened on the connecting plate 4, one end of the first crank arm 6 is installed in the sliding groove of the connecting plate 4, and the other end is fixedly connected to the spline shaft 9.

[0040] The rear transmission assembly includes a second crank arm 10, a connecting rod assembly 11 and a third crank arm 13, wherein one end of the second crank arm 10 is fixedly connected to the spline shaft 9, and the other end is connected to one end of the connecting rod assembly 11, and the other end of the connecting rod assembly 11 is connected to the third crank arm 13.

[0041] The third crank arm 13 is connected to the square shaft of the auxiliary switch 15. The rotation of the third crank arm 13 drives the rotation of the square shaft, thereby switching the auxiliary switch 15 on and off. Figure 2 As shown, the auxiliary switch 15 is mounted on the bent plate 16 and fixed to the connecting flange 17 on the other side of the bent plate 16.

[0042] This invention solves the problem of component interference caused by the increased turning radius of long-stroke auxiliary opening transmission components by using a front-stage transmission assembly composed of a connecting plate 4, a crank arm, a shaft pin, etc., which drives the connecting plate crank arm assembly to rotate with a variable radius as the piston rod 1 and guide block 2 move linearly. It also realizes the normal transmission and switching functions of the auxiliary switch through the rear-stage transmission assembly.

[0043] In one optional embodiment, an auxiliary switch transmission mechanism for a hydraulic operating mechanism is provided, including a front-stage transmission assembly I, a splined shaft 9 and a rear-stage transmission assembly II. The front-stage transmission assembly I includes a guide block 2 installed at the end of the piston rod 1, a shaft pin screw 3, a connecting plate 4, a first crank arm 6, a first shaft pin 7 and a roller 8 assembly, and a bushing 5 connected and assembled in sequence. The first crank arm 6 is installed at one end of the splined shaft 9.

[0044] The splined shaft 9 is mounted on the connecting flange 17 and is used to transmit the rotational torque and rotational angle stroke of the front-stage transmission assembly I to the rear-stage transmission assembly II.

[0045] The rear drive assembly II includes a second crank arm 10, a connecting rod assembly 11, a third crank arm 13, and a connecting plate 14, which are sequentially connected and assembled via a second shaft pin 12.

[0046] In addition, auxiliary switch assembly III includes auxiliary switch 15 and bent plate 16. Auxiliary switch 15 is mounted on bent plate 16 and assembly is mounted on connecting flange 17.

[0047] Specifically, the guide block 2 has a threaded hole on its side, and the connecting plate 4 has an elongated groove and a shaft pin hole on its plane axis. The connecting plate 4 is connected to the guide block 2 by a threaded pin 3.

[0048] The first crank arm 6 has a spline hole at one end of its plane axis and two shaft pin holes at the other end. The first shaft pin 7 and roller 8 assembly pass through the long hole groove of the connecting plate 4, are pressed onto the first crank arm 6, and are fixed with an elastic retaining ring. The bushing 5 is installed on the first shaft pin 7 and acts as an isolation between the connecting plate 4 and the first crank arm 6. The outer truncated cone at the end of the first shaft pin 7 blocks the long hole groove of the connecting plate 4 to prevent the connecting plate 4 from falling off. The connecting plate 4 can rotate relative to the guide block 2 around the threaded pin 3. The first crank arm 6 is installed on the spline shaft 9 and fixed at the end with screws.

[0049] The front-stage transmission assembly I is driven by the linear motion of the guide block 2, which drives the connecting plate 4 to rotate through the threaded pin 3. The connecting plate 4 and the first crank arm 6 slide and rotate through the long hole groove and a pair of first shaft pins 7 and rollers 8, which drive the connecting plate 4 and the first crank arm 6 to achieve the extension and rotation of the turning radius. The piston rod 1 of the hydraulic operating mechanism moves linearly to open and close the circuit, which drives the extension and rotation of the turning radius of the front-stage transmission assembly I, drives the spline shaft 9 and the rear-stage transmission assembly II to rotate, and then drives the auxiliary switch 15 to achieve the switching of the open and closed positions.

[0050] There are two third crank arms 13. The connecting rod assembly 11 is connected to one of the third crank arms 13. By fixing the two third crank arms 13 to the connecting plate 14, the two third crank arms 13 can rotate in unison.

[0051] This utility model replaces the existing guide block groove drive front crank arm + shaft pin + roller structure with a connecting plate 4 and a first crank arm 6. One end of the connecting plate 4 is hinged to the guide block 2 by a threaded pin 3. The connecting plate 4 has a long hole groove and a sliding and rolling structure with the first shaft pin 7 and roller 8 installed on the first crank arm 6. This reduces transmission friction resistance, changes the turning radius through telescopic movement, and reduces the overall size, thus meeting the usage requirements of existing limited spaces.

[0052] This utility model relates to an auxiliary switch transmission mechanism for a long-stroke hydraulic operating mechanism. It adds two shaft pin roller assemblies to the crank arm mounted on the spline shaft. One end of the connecting plate with the elongated groove is connected to the guide block mounted on the end of the piston rod by shaft pin screws. The groove and the crank arm shaft pin rollers slide and roll in cooperation. With the linear movement of the piston rod opening and closing, the connecting plate and the crank arm assembly are driven to rotate and the radius of rotation is extended and retracted, avoiding interference between components and realizing the normal transmission and switching of the opening and closing position of the auxiliary switch.

[0053] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. An auxiliary switch transmission mechanism for a hydraulic operating mechanism, characterized in that, Includes the front drive assembly, splined shaft (9) and rear drive assembly; The front-stage transmission assembly includes a connecting plate (4), one end of which is fixed with a guide block (2), and a piston rod (1) is mounted on the guide block (2). The connecting plate (4) has a sliding groove, and the connecting plate (4) is slidably connected to one end of the first crank arm (6) through the sliding groove. The other end of the first crank arm (6) is fixed on the spline shaft (9). The rear transmission assembly includes a second crank arm (10) with one end fixed to a spline shaft (9), the second crank arm (10) having one end fixed to a connecting rod assembly (11), and a third crank arm (13) mounted on the other end of the connecting rod assembly (11).

2. The auxiliary switch transmission mechanism for a hydraulic operating mechanism according to claim 1, characterized in that, The connecting plate (4) has an opening at one end that connects to the guide block (2), and a threaded pin (3) is provided in the opening. The connecting plate (4) is connected to the guide block (2) through the threaded pin (3).

3. The auxiliary switch transmission mechanism for a hydraulic operating mechanism according to claim 2, characterized in that, The guide block (2) has a threaded hole on one side for inserting a threaded pin (3).

4. The auxiliary switch transmission mechanism for a hydraulic operating mechanism according to claim 1, characterized in that, The first crank arm (6) has a shaft pin hole at one end that is slidably connected to the connecting plate (4), and a spline hole at the other end of the first crank arm (6).

5. The auxiliary switch transmission mechanism for a hydraulic operating mechanism according to claim 1, characterized in that, The first crank arm (6) is connected to the slide groove of the connecting plate (4) by the first axle pin (7).

6. The auxiliary switch transmission mechanism for a hydraulic operating mechanism according to claim 5, characterized in that, A roller (8) is provided between the first shaft pin (7) and the inner wall of the groove of the connecting plate (4).

7. The auxiliary switch transmission mechanism for a hydraulic operating mechanism according to claim 5, characterized in that, The first axle pin (7) is provided with a bushing (5) for isolating the connecting plate (4) and the first crank arm (6).

8. The auxiliary switch transmission mechanism for a hydraulic operating mechanism according to claim 5, characterized in that, The first shaft pin (7) is provided with elastic retaining rings at both ends.

9. The auxiliary switch transmission mechanism for a hydraulic operating mechanism according to claim 1, characterized in that, The second crank arm (10) and the connecting rod assembly (11) are connected by the second pivot pin (12), and the third crank arm (13) and the connecting rod assembly (11) are connected by the second pivot pin (12).

10. The auxiliary switch transmission mechanism for a hydraulic operating mechanism according to claim 1, characterized in that, The third crank arm (13) has two parts.

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