Magnetic control circuit breaker residual holding force testing device based on worm gear and worm

Abstract

A magnetic control circuit breaker residual holding force testing device based on a worm gear and a worm comprises a worm gear and worm lifting machine, the worm gear and worm lifting machine is fixed to a horizontally-arranged mounting plate, and the worm is vertically arranged to be perpendicular to the mounting plate; the mounting plate is fixed on the bracket, the bracket is arranged on the circuit breaker box body and can move relative to the circuit breaker box body, and the moving direction is a horizontal linear direction; the end, close to the circuit breaker box body, of the worm is connected with a pull pressure sensor, the end, away from the worm, of the pull pressure sensor is movably connected with a connecting rod shaft, and the end, away from the pull pressure sensor, of the connecting rod shaft is movably connected to a mechanism branch hand plate of a magnetic control mechanism in the circuit breaker box body. The worm and gear lifting machine is arranged to serve as an output source for testing, testing is simpler and more convenient, movement of the support relative to the circuit breaker box body and the magnetic control mechanism can be located on the same vertical straight line, and then the precision of the obtained retention force is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of magnetic control holding force testing, in particular to a worm gear-based magnetic control circuit breaker residual holding force testing device. Background Art

[0002] The magnetic control operating mechanism of a circuit breaker offers numerous advantages, including a simple structure, long mechanical life, fast operation time, and low power consumption. The magnetic control mechanism primarily consists of a moving iron core, a stationary iron core, an excitation coil, and a tripping spring. The output shaft is mounted on the moving iron core. Its basic operating process involves injecting a positive closing pulse current into the mechanism coil via a dedicated control module. After excitation, the moving iron core moves until it engages with the stationary iron core, completing the circuit breaker closing operation. The mechanism then relies on residual magnetism to maintain the closed position, requiring no energy to maintain. During tripping, a reverse current is injected into the excitation coil for demagnetization, and the tripping spring activates the circuit breaker tripping operation. Because the magnetic control material relies on residual magnetic holding force to maintain the circuit breaker's closed state after excitation, sufficient residual magnetic holding force in the magnetic control mechanism is essential for maintaining reliable operation of the circuit breaker. Insufficient residual magnetic holding force can cause the circuit breaker to automatically trip during operation, resulting in a power outage.

[0003] The residual magnetic holding force of the magnetic control mechanism is a key parameter for measuring the reliable operation of magnetically controlled circuit breakers, and therefore requires testing. Before circuit breaker assembly, direct measurement can be performed using conventional equipment such as a tensile tester. However, direct testing using a tensile tester during factory inspection or on-site maintenance after assembly is difficult and results in significant errors, making it difficult to meet practical requirements. Utility Model Content

[0004] In order to solve the problem that the direct testing method of the above-mentioned tensile testing machine is not suitable for magnetic holding test, the utility model provides a residual holding force testing device for a magnetically controlled circuit breaker based on a worm gear.

[0005] The technical solution of this utility model is as follows:

[0006] A worm gear-based magnetically controlled circuit breaker residual holding force test device comprises a worm gear elevator fixed on a horizontally arranged mounting plate, and the worm gear is arranged vertically perpendicular to the mounting plate;

[0007] The mounting plate is fixed on the bracket, and the bracket is arranged on the circuit breaker box and can move relative to the circuit breaker box, and the moving direction is a horizontal straight line direction;

[0008] The end of the worm gear close to the circuit breaker box is connected to the tension and pressure sensor, and the end of the tension and pressure sensor away from the worm gear is movably connected to the connecting rod shaft, and the end of the connecting rod shaft away from the tension and pressure sensor is movably connected to the mechanism separation plate of the magnetic control mechanism in the circuit breaker box.

[0009] Different from existing methods, this system uses a worm gear lift as the output source, and then uses a tension and pressure sensor for testing. The bracket moves relative to the circuit breaker housing, and when the worm gear lift outputs tension, it moves with the bracket to the same vertical line as the magnetic control mechanism, thereby improving the accuracy of the holding force.

[0010] The method for realizing the rotational connection between the connecting rod shaft and the tension and pressure sensor is that a sensor U-shaped connection is provided at one end of the connecting rod shaft close to the tension and pressure sensor, and the tension and pressure sensor is rotationally connected to the sensor U-shaped connection through a sensor pin shaft that passes horizontally through the sensor.

[0011] In order to prevent the tension and pressure sensor from being collided, an extension hole plate is provided at the lower end of the tension and pressure sensor, and the U-shaped connection of the sensor is provided with a vertical waist-shaped hole, and the sensor pin shaft passes through the waist-shaped hole and the opening of the extension hole plate.

[0012] The method of limiting the movement path of the U-shaped connection of the sensor is that the stroke length of the sensor pin shaft moving in the waist-shaped hole is less than the minimum distance between the opening of the extended orifice plate and the tension and pressure sensor.

[0013] The above-mentioned connecting rod shaft is connected to the mechanism breaking plate in the following manner: a circuit breaker U-shaped connection is provided at the lower end of the connecting rod shaft, and a detachable pin shaft of the circuit breaker U-shaped connection is connected through the mechanism breaking plate.

[0014] The bracket is movably connected to the circuit breaker box in that a bearing mounting plate is provided at one end of the bracket close to the circuit breaker box, and the bearing mounting plate is provided with a rolling bearing connected to the circuit breaker box and is movable.

[0015] As a preferred solution, the central axis of the worm and the central axis of the magnetron mechanism can be moved to a coaxial position.

[0016] In order to facilitate the disassembly of the worm gear elevator and related structures, the mounting plate and the bracket are formed in one piece, and the worm gear elevator and the mounting plate are detachably connected.

[0017] The above-mentioned mounting plate is connected to the worm gear lift in such a way that an upward L-shaped extension is provided at one end of the mounting plate, the worm gear lift can be inserted into the L-shaped extension, and can be fixed to the opening of the mounting plate by positioning bolts when it is in close contact with the vertical surface of the L-shaped extension.

[0018] As a preferred solution, the end of the L-shaped extension is chamfered.

[0019] The beneficial effects of the utility model are as follows: the utility model is a worm gear-based magnetic control circuit breaker residual holding force test device, the weight of the entire tooling after assembly is within 9 kg, the output force is above 4000 N, no overhead crane is required during use, the tooling structure is compact and reliable, and it is easy for operators to use; and by adjusting the bearing mounting plate, the placement width of the test tooling can be adjusted, and it can be suitable for residual holding force tests of magnetic control switches of different models, with a wide range of applications; and after one adjustment, multiple circuit breakers of the same model can be measured; during the test process, the output tension is always in the same straight line as the movement direction of the tested mechanism, and the test accuracy is high; and a rolling bearing is used at the bottom, and the test position is automatically adjusted by the action of force during the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] By reading the detailed description of the preferred embodiment below, the solutions and advantages of the present application will become clear to those skilled in the art. The accompanying drawings are only used to illustrate the preferred embodiment and are not to be considered as limiting the present invention.

[0021] In the attached figure:

[0022] Figure 1 This is a schematic diagram of the structure of the utility model;

[0023] Figure 2 This is a schematic diagram of the relevant connection structure of the worm gear elevator of the utility model;

[0024] Figure 3 This is a schematic diagram of the connection structure of the magnetic control mechanism of the utility model;

[0025] Figure 4 This is a schematic diagram of the connection structure of the worm gear elevator of the utility model;

[0026] The components represented by the reference numerals in the figure are:

[0027] 1. Worm gear lift; 2. Mounting plate; 3. Tension and pressure sensor; 4. Sensor pin; 5. Sensor U-shaped connection; 6. Connecting rod shaft; 7. Circuit breaker U-shaped connection; 8. Magnetron mechanism; 9. Mechanism separation plate; 10. Circuit breaker housing; 11. Rolling bearing; 12. Bearing mounting plate; 13. Bracket; 14. Hand crank; 15. L-shaped extension; 16. Positioning bolt. DETAILED DESCRIPTION

[0028] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. It should be noted that these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. The present disclosure can be implemented in various forms and should not be limited by the embodiments described herein.

[0029] Example

[0030] like Figure 1 The device for testing the residual holding force of a magnetically controlled circuit breaker based on a worm gear is shown, comprising a worm gear elevator 1 fixed to a horizontally arranged mounting plate 2, with the worm arranged vertically perpendicular to the mounting plate 2. A hand-cranked wheel 14 for driving the worm to rotate is provided on one side of the worm gear elevator 1. By manually rotating the hand-cranked wheel 14, the end of the worm can be driven to rise and fall.

[0031] The mounting plate 2 is then fixed to the bracket 13, which is mounted on the circuit breaker housing 10 and can move relative to the circuit breaker housing 10 in a horizontal, linear direction. This method allows for adaptability to various models of magnetically controlled opening systems, offering greater applicability compared to existing dedicated equipment. Furthermore, in this structure, the central axis of the worm and the central axis of the magnetic control mechanism 8 can be moved to a coaxial position. This movement allows for a straight line tension, resulting in more accurate retention force test parameters.

[0032] like Figure 3 As shown, the bracket 13 is movably connected to the circuit breaker case 10 in the following manner: a bearing mounting plate 12 is provided at one end of the bracket 13 close to the circuit breaker case 10, and the bearing mounting plate 12 is provided with a rolling bearing 11 connected to the circuit breaker case 10 and movable. By rotating the rolling bearing 11, the position can be adjusted to achieve adaptation, and as the tension increases, the above adjustment process is automatically performed. Under the action of the tension, the bracket 13 will move until the tension is reflected as a straight line.

[0033] Then, based on the above structure, further, Figure 2 As shown, the end of the worm gear close to the circuit breaker housing 10 is connected to the tension and pressure sensor 3, and the end of the tension and pressure sensor 3 away from the worm gear is movably connected to the connecting rod shaft 6. The end of the connecting rod shaft 6 away from the tension and pressure sensor 3 is movably connected to the mechanism separation plate 9 of the magnetic control mechanism 8 in the circuit breaker housing 10. Through the above method, the connection between the output end and the magnetic control mechanism 8 can be achieved, and the holding test can be performed. The method is to manually rotate the hand wheel 14 to make the end of the worm gear start to move upward. During the upward movement, the mechanism separation plate 9 is driven to move upward by connecting the connecting rod shaft 6. During the upward movement of the worm gear, the tension and pressure sensor 3 can record the tension exerted on the magnetic control mechanism 8 in real time. At the moment when the dynamic and static iron cores of the magnetic control mechanism 8 are completely separated, the residual holding force of the circuit breaker is obtained on the display screen of the tension and pressure sensor 3.

[0034] This can be achieved through the above-mentioned device. Different from the existing method, by setting the worm gear elevator 1 as the output source, and then testing through the tension and pressure sensor 3, its structural weight is relatively low, only the weight of the worm gear elevator 1, and the above-mentioned worm gear elevator 1 is manually driven, and the weight is even lower. The characteristic of the worm gear elevator 1 is that it can manually output a large force, and then the worm can be tested for holding force with sufficient tension. At the same time, in the above-mentioned structure, the movement of the bracket 13 relative to the circuit breaker box 10 can move with the bracket 13 to the same vertical line as the magnetic control mechanism 8 when the worm gear elevator 1 outputs tension. In this way, the accuracy of the holding force is improved, and not only does it not require manual alignment operations, but it can also be applied to more models of products.

[0035] As one embodiment, the connection between the connecting rod shaft 6 and the tension and pressure sensor 3 is achieved by rotating as follows: Figure 2 As shown, a sensor U-shaped connection 5 is provided at one end of the connecting rod shaft 6 close to the tension and pressure sensor 3. After the sensor U-shaped connection 5 is connected to the tension and pressure sensor 3, it can be rotated in a vertical plane. In order to fix it, the tension and pressure sensor 3 is rotatably connected to the sensor U-shaped connection 5 through a horizontally penetrating sensor pin 4. The penetration of the sensor pin 4 can avoid the separation of the above-mentioned two structural parts and act as a rotation axis for application.

[0036] Afterwards, in the above structure, it should be noted that in order to prevent the tension and pressure sensor 3 from being hit, an extension hole plate is set at the lower end of the tension and pressure sensor 3. At the moment when the dynamic and static iron cores of the above-mentioned magnetic control mechanism 8 separate, the structural parts will move upward under the action of inertia. If no interference is made, the above-mentioned tension and pressure sensor 3 will be damaged by the collision. To this end, the sensor U-shaped connection 5 is provided with a vertical waist-shaped hole. The sensor pin shaft 4 passes through the waist-shaped hole and the opening of the extension hole plate. Through the above-mentioned setting method, the circuit breaker U-shaped connection 7 and the connecting rod shaft 6 can rotate freely after being connected and have a certain movable distance in the vertical direction. This avoids the kinetic energy generated at the moment of circuit breaker opening from being transmitted to cause the test tool to bounce up, causing collision damage to parts, while also preventing harm to operators.

[0037] The specific configuration of the above structure is to limit the movement path of the sensor U-shaped connection 5 in such a way that the travel length of the sensor pin 4 in the waist-shaped hole is less than the minimum distance between the opening of the extended orifice plate and the tension and pressure sensor 3. By limiting the sensor U-shaped connection 5, collisions with structural components are minimized.

[0038] Afterwards, based on the above structure, the above-mentioned connecting rod shaft 6 is connected to the mechanism separation plate 9 in the following manner: a circuit breaker U-shaped connection 7 is provided at the lower end of the connecting rod shaft 6, and the circuit breaker U-shaped connection 7 has a detachable pin shaft that penetrates and connects with the mechanism separation plate 9.

[0039] In the above structure, if the worm gear lifter 1 needs to be disassembled, the conventional method of connecting with multiple bolts will result in too many loose and tight structural parts, affecting the disassembly and assembly efficiency. Figure 4 As shown, in order to facilitate the disassembly of the worm gear lift 1 and related structures, the mounting plate 2 and the bracket 13 are integrally formed, and the worm gear lift 1 and the mounting plate 2 are detachably connected.

[0040] The mounting plate 2 is connected to the worm gear lift 1 by providing an upward L-shaped extension 15 at one end of the mounting plate 2. The worm gear lift 1 can be inserted into the L-shaped extension 15 and, when in close contact with the vertical surface of the L-shaped extension 15, secured to the opening of the mounting plate 2 via positioning bolts 16. When the worm gear lift 1 is not in close contact with the vertical surface of the L-shaped extension 15, the positioning bolts 16 cannot be aligned with and secured to the opening of the mounting plate 2. To facilitate the insertion of the worm gear lift 1 into the L-shaped extension 15, the end of the L-shaped extension 15 is chamfered.

Claims

1. A worm gear-based magnetic control circuit breaker residual holding force test device, comprising a worm gear elevator (1), characterized in that: The worm gear elevator (1) is fixed on a horizontally arranged mounting plate (2), and the worm is arranged vertically perpendicular to the mounting plate (2); The mounting plate (2) is fixed on a bracket (13), and the bracket (13) is arranged on a circuit breaker box (10) and is movable relative to the circuit breaker box (10), and the moving direction is a horizontal linear direction; One end of the worm gear close to the circuit breaker housing (10) is connected to a tension and pressure sensor (3), and one end of the tension and pressure sensor (3) away from the worm gear is movably connected to a connecting rod shaft (6), and one end of the connecting rod shaft (6) away from the tension and pressure sensor (3) is movably connected to a mechanism separation plate (9) of a magnetic control mechanism (8) in the circuit breaker housing (10).

2. A worm gear-based magnetically controlled circuit breaker residual holding force testing device according to claim 1, characterized in that: A sensor U-shaped connection (5) is provided at one end of the connecting rod shaft (6) close to the tension and pressure sensor (3), and the tension and pressure sensor (3) is rotationally connected to the sensor U-shaped connection (5) via a sensor pin shaft (4) that passes through horizontally.

3. The worm gear-based magnetically controlled circuit breaker residual holding force testing device according to claim 2, characterized in that: An extension orifice plate is provided at the lower end of the tension and pressure sensor (3), a vertical waist-shaped hole is provided on the sensor U-shaped connection (5), and the sensor pin shaft (4) passes through the waist-shaped hole and the opening of the extension orifice plate.

4. The worm gear-based magnetically controlled circuit breaker residual holding force testing device according to claim 3, characterized in that: The travel length of the sensor pin shaft (4) moving in the waist-shaped hole is less than the minimum distance between the opening of the extension hole plate and the tension and pressure sensor (3).

5. The worm gear-based magnetically controlled circuit breaker residual holding force testing device according to claim 1, characterized in that: A circuit breaker U-shaped connection (7) is provided at the lower end of the connecting rod shaft (6), and a detachable pin shaft of the circuit breaker U-shaped connection (7) is connected through the mechanism separation plate (9).

6. The worm gear-based magnetically controlled circuit breaker residual holding force testing device according to claim 1, characterized in that: A bearing mounting plate (12) is provided at one end of the bracket (13) close to the circuit breaker box (10), and the bearing mounting plate (12) is provided with a rolling bearing (11) connected to the circuit breaker box (10) and is movable.

7. The worm gear-based magnetically controlled circuit breaker residual holding force testing device according to claim 1, characterized in that: The central axis of the worm and the central axis of the magnetron mechanism (8) can be moved to a coaxial position.

8. The worm gear-based magnetically controlled circuit breaker residual holding force testing device according to claim 1, characterized in that: The mounting plate (2) and the bracket (13) are integrally formed, and the worm gear elevator (1) and the mounting plate (2) are detachably connected.

9. The worm gear-based magnetically controlled circuit breaker residual holding force testing device according to claim 8, characterized in that: An upward L-shaped extension (15) is provided at one end of the mounting plate (2), and the worm gear elevator (1) can be inserted into the L-shaped extension (15) and can be fixed to the opening of the mounting plate (2) by means of a positioning bolt (16) when it is in close contact with the vertical surface of the L-shaped extension (15).

10. The worm gear-based magnetically controlled circuit breaker residual holding force testing device according to claim 9, characterized in that: The end of the L-shaped extension (15) is chamfered.

Images