Mechanical interlock of self-locking valve opening mechanism of switch cabinet

Abstract

The invention provides a mechanical interlock of a self-locking valve opening mechanism of a switch cabinet, which relates to the technical field of medium-voltage alternating-current metal-enclosed switch equipment and control equipment and comprises a valve plate, a fixed plate welding part, an upper interlocking plate welding part, a lower interlocking plate welding part, a spring I, a spring II, a self-locking plate and an unlocking plate, the unlocking plate tilts outwards under the supporting force of the unlocking torsional spring, the elastic cylindrical stop pin and the lock plate slide in the upper interlocking plate welding and lower interlocking plate welding directions under the effect of the supporting force of the unlocking torsional spring, and at the moment, under the tensile force of the first spring and the second spring and the supporting force of the lower limiting position of the valve, the elastic cylindrical stop pin slides in the upper interlocking plate welding and lower interlocking plate welding directions. The sharp corners beside the shaft sleeves of the upper interlocking plate welding part and the lower interlocking plate welding part just form small clamping grooves, the self-locking plate is just clamped in the small clamping grooves, interlocking is in a locked state in the state, namely, the circuit breaker is not pushed into a cabinet or does not enter a working state, at the moment, a valve cannot be forcibly pushed open manually to make contact with a static contact, the self-locking function of the structure is safe and reliable, and manual misoperation is prevented.

Description

Technical Field

[0001] The present invention relates to the technical field of medium-voltage AC metal-enclosed switchgear and control equipment, and particularly to a mechanical interlock for a self-locking valve opening mechanism of a switch cabinet. Background Art

[0002] In medium-voltage AC metal-enclosed switchgear and control equipment, during the operation of inserting and removing the circuit breaker, which is the main core component, the valve opening mechanism plays an essential role; when the handcart is withdrawn from the switch cabinet without power-off, in order to protect personal safety, the upper and lower valves cannot be opened randomly, so it is necessary to design mechanical locking and interlocking components to meet the requirements.

[0003] The mechanical interlock function of the valve opening mechanism includes two parts: the first part is that during the process of the circuit breaker handcart entering the cabinet, the upper and lower valves are opened so that the static contacts inside the switch cabinet can be smoothly inserted into the upper and lower moving contacts of the circuit breaker for closing; the second part is that during the process of the circuit breaker handcart leaving the cabinet, the upper and lower valves are closed so that after the handcart exits the cabinet body, the static contacts are not exposed; for the second function, most of the existing valve opening mechanisms can be flexibly realized, but for some non-professional operating users, when the handcart exits the cabinet body but the cabinet body is still energized, the valve may be opened under external force, causing the live static contacts to be exposed, endangering the personal safety of the operator; in response to this, some solutions are to add a padlock function to the valve. When the handcart exits the cabinet body, lock it with a padlock in time, and then open the padlock before the handcart enters the cabinet for the handcart to enter the cabinet; although this method can meet the requirements, the padlock reduces the effect of the mechanical interlock and the operation is relatively cumbersome.

[0004] Therefore, we propose a mechanical interlock for a self-locking valve opening mechanism of a switch cabinet to solve the above problems. Summary of the Invention

[0005] The problem to be solved by the present invention is that for some non-professional operating users, when the handcart exits the cabinet body but the cabinet body is still energized, the valve may be opened under external force, causing the live static contacts to be exposed, endangering the personal safety of the operator.

[0006] To solve the above technical problems, the present invention provides a mechanical interlock for a self-locking valve opening mechanism of a switch cabinet, including a valve plate and a transmission component. The transmission component includes a fixed plate welded, an upper interlock plate welded, a lower interlock plate welded, a first spring, a second spring, a self-locking plate, an unlocking plate, a bush, a support sleeve, an elastic cylindrical pin, an unlocking torsion spring, a self-locking support, and a long bolt.

[0007] The number of the trap doors is two. Both ends of the trap doors are fixedly connected with trap door track plates. Short chains are movably connected to the sides of the trap door track plates close to the trap doors, and long chains are also movably connected to the sides of the trap door track plates close to the trap doors. One end of the short chain away from the trap door track plate is movably connected to one end of the lower interlock plate by welding, and one end of the long chain away from the trap door track plate is movably connected to one end of the upper interlock plate by welding. Rollers are movably connected to the sides of the upper interlock plate by welding and the lower interlock plate by welding through screws.

[0008] Preferably, a stepped shaft is fixedly connected to the surface of the welded fixed plate. A thick-hole diameter bushing is fixedly connected to the surface of the upper interlock plate by welding, and a thin-hole diameter bushing is fixedly connected to the surface of the lower interlock plate by welding. The thick-hole diameter bushing on the surface of the upper interlock plate by welding is adapted to the thin-hole diameter bushing on the surface of the lower interlock plate by welding. The thick-hole diameter bushing on the surface of the upper interlock plate by welding and the thin-hole diameter bushing on the surface of the lower interlock plate by welding are both movably sleeved on the outside of the stepped shaft on the surface of the welded fixed plate by a shaft pin. The lower interlock plate by welding is located between the welded fixed plate and the upper interlock plate by welding.

[0009] Preferably, a first spring and a second spring are respectively sleeved on both ends of the side of the stepped shaft on the surface of the welded fixed plate. The first spring is located between the welded fixed plate and the lower interlock plate by welding, and the second spring is located between the upper interlock plate by welding and the lower interlock plate by welding.

[0010] Preferably, one end of the first spring is fixedly connected to the small pin on the surface of the welded fixed plate, and the hook at the other end of the first spring is fixedly connected to the side of the lower interlock plate by welding.

[0011] Preferably, one end of the second spring is fixedly connected in the curved notch on the surface of the welded fixed plate, and the hook at the other end of the second spring is fixedly connected to the side of the upper interlock plate by welding.

[0012] Preferably, the self-locking bracket is fixedly connected to the surface of the welded fixed plate. A round hole is formed in the middle of the surface of the self-locking plate. An elastic cylindrical pin is fixedly connected in the round hole in the middle of the surface of the self-locking plate. Square holes are formed at the bending parts at both ends of the self-locking bracket. The side of the self-locking plate is adapted to the inner walls of the square holes at both ends of the bending of the self-locking bracket. A long round hole is formed in the middle of the surface of the self-locking bracket. The inner wall of the long round hole on the surface of the self-locking bracket is slidably connected to the side of the elastic cylindrical pin.

[0013] Preferably, the oblong hole at one end of the unlocking plate is movably sleeved outside the elastic cylindrical retaining pin. The round hole on the surface of the unlocking plate is aligned with the round hole on the surface of the self-locking bracket. A cushion sleeve is provided at the round part on the upper surface of the unlocking plate, and a bracket sleeve is provided at the round hole on the lower surface of the unlocking plate. The round hole on the surface of the unlocking plate, the round hole on the surface of the self-locking bracket, the bracket sleeve and the cushion sleeve are connected by a long bolt, and an unlocking torsion spring is also sleeved outside the long bolt.

[0014] Preferably, one end of the unlocking torsion spring is fixedly connected to the side surface of the elastic cylindrical retaining pin, and the other end of the unlocking torsion spring is adapted to the notch on the side surface of the self-locking bracket.

[0015] The technical effects and advantages of the present invention:

[0016] 1. In the process of using the present invention, by providing a torsion spring, the unlocking plate warps outwards under the supporting force of the unlocking torsion spring. Under the action of the supporting force of the unlocking torsion spring, the elastic cylindrical retaining pin slides along the welding direction of the upper interlocking plate and the lower interlocking plate together with the locking plate. At this time, under the pulling force of the first spring and the second spring and the supporting force of the lower limit of the movable door, the sharp corners beside the bushings of the upper interlocking plate welding and the lower interlocking plate welding just form a small card slot, and the self-locking plate just snaps in. In this state, the interlocking is in a locked state, that is, the circuit breaker is not pushed into the cabinet or not in the working state. At this time, it is impossible to forcibly push the movable door up and down manually to contact the static contact. The self-locking function of this structure is safe and reliable, preventing human misoperation.

[0017] 2. By providing the unlocking plate and the self-locking plate in the present invention, when the handcart withdraws from the working position, after the roller is no longer squeezed by the curtain lifting box, first, the first spring and the second spring that are elastically deformed by extrusion slide the movable door plate to close during the reset process. Immediately afterwards, after the unlocking plate is no longer squeezed by the circuit breaker, during the reset process of the unlocking torsion spring that is elastically deformed by extrusion, the self-locking plate is again clamped between the sharp corners of the upper interlocking plate welding and the lower interlocking plate welding for locking. The present invention endows the movable door opening mechanism with a self-locking mechanical interlocking function. This design has a simple interlocking, convenient operation, better mechanical interlocking performance, and reliable locking. Brief Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the assembly of the interlocking components of the present invention and the position of the components in the state where the handcart withdraws from the cabinet;

[0019] Figure 2 For the present invention Figure 1 The enlarged schematic diagram of the structure at A in

[0020] Figure 3 It is a schematic diagram of the position of the components in the state where the handcart of the present invention enters the working position of the cabinet;

[0021] Figure 4 It is a schematic diagram of the welding structure of the chain plate and the lower connecting plate of the present invention;

[0022] Figure 5 Schematic diagram of the assembly structure of the locking mechanism of the present invention;

[0023] Figure 6 Schematic diagram of the welding structure of the fixing plate of the present invention;

[0024] Figure 7 Schematic diagram of the self-locking plate structure of the present invention;

[0025] Figure 8 Schematic diagram of the unlocking plate structure of the present invention;

[0026] Figure 9 Schematic diagram of the self-locking bracket structure of the present invention.

[0027] The reference numerals are: 1, movable door panel; 2, movable door track plate; 3, short chain; 4, long chain; 5, roller; 6, fixing plate welding; 7, upper interlocking plate welding; 8, lower interlocking plate welding; 9, spring I; 10, spring II; 11, self-locking plate; 12, unlocking plate; 13, spacer sleeve; 14, bracket sleeve; 15, elastic cylindrical pin; 16, unlocking torsion spring; 17, self-locking bracket; 18, long bolt. Specific embodiments

[0028] The present invention provides a mechanical interlock for a self-locking movable door opening mechanism of a switch cabinet, as Figures 1-9 shown, including a movable door panel 1 and a transmission component. The transmission component includes a fixing plate welding 6, an upper interlocking plate welding 7, a lower interlocking plate welding 8, a spring I 9, a spring II 10, a self-locking plate 11, an unlocking plate 12, a spacer sleeve 13, a bracket sleeve 14, an elastic cylindrical pin 15, an unlocking torsion spring 16, and a self-locking bracket 17;

[0029] There are two trap doors 1. Both ends of the trap door 1 are fixedly connected with trap door track plates 2. Short chains 3 are movably connected to the sides of the trap door track plates 2 close to the trap door 1. Long chains 4 are also movably connected to the sides of the trap door track plates 2 close to the trap door 1. One end of the short chain 3 away from the trap door track plate 2 is movably connected to one end of the lower interlocking plate welded part 8. One end of the long chain 4 away from the trap door track plate 2 is movably connected to one end of the upper interlocking plate welded part 7. Rollers 5 are movably connected to the sides of the upper interlocking plate welded part 7 and the lower interlocking plate welded part 8 through screws. A stepped shaft is fixedly connected to the surface of the fixed plate welded part 6. A thick-aperture bushing is fixedly connected to the surface of the upper interlocking plate welded part 7. A thin-aperture bushing is fixedly connected to the surface of the lower interlocking plate welded part 8. The thick-aperture bushing on the surface of the upper interlocking plate welded part 7 is adapted to the thin-aperture bushing on the surface of the lower interlocking plate welded part 8. The thick-aperture bushing on the surface of the upper interlocking plate welded part 7 and the thin-aperture bushing on the surface of the lower interlocking plate welded part 8 are both movably sleeved on the outside of the stepped shaft on the surface of the fixed plate welded part 6 by a shaft pin. The lower interlocking plate welded part 8 is located between the fixed plate welded part 6 and the upper interlocking plate welded part 7. During use, when the circuit breaker continues to move forward, the side wall curtain box contacts the rollers 5 on the upper interlocking plate welded part 7 and the lower interlocking plate welded part 8. While the rollers 5 are squeezed by the curtain box, the upper interlocking plate welded part 7 and the lower interlocking plate welded part 8 rotate around the stepped shaft welded on the fixed plate welded part 6. The short chain 3 and the long chain 4 connected by a pin shaft at the other end slide up and down along the trap door track plate 2 with the trap door 1 respectively under their drive, so as to open the trap door, enabling the static contact to be inserted into the moving contact on the circuit breaker trolley. At the same time, the first spring 9 and the second spring 10 undergo elastic deformation. At this time, the interlocking component is in the unlocked state, and the circuit breaker is pushed into the cabinet to enter the working state position.

[0030] Furthermore, the first spring 9 and the second spring 10 are respectively sleeved on both ends of the side of the stepped shaft on the surface of the fixed plate welded part 6. The first spring 9 is located between the fixed plate welded part 6 and the lower interlocking plate welded part 8. The second spring 10 is located between the upper interlocking plate welded part 7 and the lower interlocking plate welded part 8. One end of the first spring 9 is fixedly connected to the small pin on the surface of the fixed plate welded part 6. The hook at the other end of the first spring 9 is fixedly connected to the side of the lower interlocking plate welded part 8. One end of the second spring 10 is fixedly connected in the bent notch on the surface of the fixed plate welded part 6. The hook at the other end of the second spring 10 is fixedly connected to the side of the upper interlocking plate welded part 7. During use, under the pulling force of the first spring 9 and the second spring 10 and the supporting force of the lower limit of the trap door, the sharp corners beside the bushings of the upper interlocking plate welded part 7 and the lower interlocking plate welded part 8 just form small card slots, and the self-locking plate 11 just snaps in. In this state, the interlocking is in the locked state, that is, the circuit breaker is not pushed into the cabinet or has not entered the working state. At the same time, it is not possible to manually push the trap door up and down forcefully to contact the static contact.

[0031] Furthermore, the self-locking bracket 17 is fixedly connected to the surface of the fixed plate welding 6, a circular hole is opened in the middle of the surface of the self-locking plate 11, and an elastic cylindrical stop pin 15 is fixedly connected in the circular hole in the middle of the surface of the self-locking plate 11, and the curved parts at both ends of the self-locking bracket 17 are opened with square holes, and the side surfaces of the self-locking plate 11 are adapted to the inner walls of the curved square holes at both ends of the self-locking bracket 17, and an oblong hole is opened in the middle of the surface of the self-locking bracket 17, and the inner wall of the oblong hole on the surface of the self-locking bracket 17 is slidably connected to the side surface of the elastic cylindrical stop pin 15, and the oblong hole at one end of the unlocking plate 12 is movably sleeved on the outer side of the elastic cylindrical stop pin 15, and the circular hole on the surface of the unlocking plate 12 is compatible with the surface of the self-locking bracket 17 The circular holes on the two surfaces are aligned, a cushion sleeve 13 is provided at the circle on the upper surface of the unlocking plate 12, and a bracket sleeve 14 is provided at the circular hole on the lower surface of the unlocking plate 12. The circular hole on the surface of the unlocking plate 12 is connected to the circular hole on the surface of the self-locking bracket 17 and the bracket sleeve 14 and the cushion sleeve 13 by a long bolt 18, and an unlocking torsion spring 16 is also sleeved on the outer side of the long bolt 18. When in use, as the circuit breaker enters the cabinet, the curtain box on the side wall of the circuit breaker first hits the raised unlocking plate 12, and the unlocking plate 12 is pressed down. At the same time, the elastic cylindrical stop pin 15 in the oblong hole at the other end is squeezed, causing the self-locking plate 11 to slide to the right, and the unlocking torsion spring 16 is squeezed and elastically deformed, and the unlocking is successful.

[0032] Furthermore, one end of the unlocking torsion spring 16 is fixedly connected to the side of the elastic cylindrical stop pin 15, and the other end of the unlocking torsion spring 16 is adapted to the door groove on the side of the self-locking bracket 17. When in use, the elastic cylindrical stop pin 15 slides toward the upper interlocking plate welding assembly 7 and the lower interlocking plate welding assembly 8 together with the locking plate under the support force of the unlocking torsion spring 16.

[0033] The working principle of the present invention is as follows: Figure 2 As shown, spring 1 9, spring 2 10, and unlocking torsion spring 16 are all in the initial state without external force. At this time, the unlocking plate 12 is tilted outward under the support force of the unlocking torsion spring 16, and the elastic cylindrical stop pin 15 slides together with the lock plate in the direction of the upper interlocking plate welding assembly 7 and the lower interlocking plate welding assembly 8 under the support force of the unlocking torsion spring 16. At this time, under the pulling force of spring 1 9 and spring 2 10 and the support force of the lower limit of the valve, the sharp corners next to the shaft sleeves of the upper interlocking plate welding assembly 7 and the lower interlocking plate welding assembly 8 just form a small slot, and the self-locking plate 11 just snaps in. In this state, the interlock is in a locked state, that is, the circuit breaker is not pushed into the cabinet or has not entered the working state. At the same time, the valve cannot be manually pushed up and down to contact the static contact.

[0034] like Figure 3 As shown, as the circuit breaker enters the cabinet, the curtain box on the side wall of the circuit breaker first hits the raised unlocking plate 12, and the unlocking plate 12 is pressed down. At the same time, the elastic cylindrical stop pin 15 in the oblong hole at the other end is squeezed, causing the self-locking plate 11 to slide to the right, and the unlocking torsion spring 16 is squeezed and elastically deformed, and the unlocking is successful;

[0035] The circuit breaker continues to enter the vehicle, and the side wall curtain box contacts the roller 5 on the upper interlocking plate welding 7 and the lower interlocking plate welding 8. When the roller 5 is squeezed by the curtain box, the upper interlocking plate welding 7 and the lower interlocking plate welding 8 rotate around the stepped shaft welded on the fixed plate welding 6. The short chain 3 and the long chain 4 connected by the pin at the other end respectively drive the valve plate 1 to slide up and down along the valve track plate 2, thereby opening the valve, so that the static contact is inserted into the moving contact on the circuit breaker trolley, and at the same time, the spring 1 9 and the spring 2 10 are elastically deformed. At this time, the interlocking component is in the unlocked state, and the circuit breaker is pushed into the cabinet to enter the working state position;

[0036] When the trolley is withdrawn from the working position, the roller 5 is not squeezed by the curtain box, and the spring 1 9 and the spring 2 10 are squeezed and elastically deformed. The valve plate 1 slides and closes during the reset process, and then the unlocking plate 12 is not squeezed by the circuit breaker, and the unlocking torsion spring 16 is squeezed and elastically deformed. During the reset process, the self-locking plate 11 is clamped in the middle of the sharp corners of the upper interlocking plate welding 7 and the lower interlocking plate welding 8 to lock it;

[0037] The implementation method and principle of the left self-locking opening mechanism, which is symmetrical to the left side, are the same as those of the right side opening mechanism.

[0038] It is to be understood that the present invention is described by some embodiments, and it is known to those skilled in the art that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A mechanical interlock for a self-locking door opening mechanism of a switchgear, comprising a door panel (1) and a transmission component, characterized in that: The transmission components include a fixed plate welded joint (6), an upper interlock plate welded assembly (7), a lower interlock plate welded assembly (8), a first spring (9), a second spring (10), a self-locking plate (11), an unlocking plate (12), a bush (13), a bracket sleeve (14), an elastic cylindrical pin (15), an unlocking torsion spring (16), a self-locking bracket (17), and a long bolt (18); There are two shutter doors (1), and both ends of the shutter door (1) are fixedly connected with shutter door track plates (2). On the side of the shutter door track plate (2) close to the shutter door (1), a short chain (3) is movably connected, and a long chain (4) is also movably connected. One end of the short chain (3) far from the shutter door track plate (2) is movably connected with one end of the lower interlock plate welded assembly (8), and one end of the long chain (4) far from the shutter door track plate (2) is movably connected with one end of the upper interlock plate welded assembly (7). Rollers (5) are movably connected to the sides of the upper interlock plate welded assembly (7) and the lower interlock plate welded assembly (8) through screws.

2. The mechanical interlock of a self-locking valve opening mechanism for a switch cabinet according to claim 1, characterized in that: A stepped shaft is fixedly connected to the surface of the fixed plate welded joint (6). A thick-hole diameter bushing is fixedly connected to the surface of the upper interlock plate welded assembly (7), and a thin-hole diameter bushing is fixedly connected to the surface of the lower interlock plate welded assembly (8). The thick-hole diameter bushing on the surface of the upper interlock plate welded assembly (7) is adapted to the thin-hole diameter bushing on the surface of the lower interlock plate welded assembly (8). The thick-hole diameter bushing on the surface of the upper interlock plate welded assembly (7) and the thin-hole diameter bushing on the surface of the lower interlock plate welded assembly (8) are both movably sleeved on the outside of the stepped shaft on the surface of the fixed plate welded joint (6) by a shaft pin. The lower interlock plate welded assembly (8) is located between the fixed plate welded joint (6) and the upper interlock plate welded assembly (7).

3. The mechanical interlock of a self-locking valve opening mechanism for a switch cabinet according to claim 2, characterized in that: The first spring (9) and the second spring (10) are respectively sleeved on both ends of the side of the stepped shaft on the surface of the fixed plate welded joint (6). The first spring (9) is located between the fixed plate welded joint (6) and the lower interlock plate welded assembly (8), and the second spring (10) is located between the upper interlock plate welded assembly (7) and the lower interlock plate welded assembly (8).

4. The mechanical interlock of a self-locking door opening mechanism for a switch cabinet according to claim 3, characterized in that: One end of the first spring (9) is fixedly connected to the small pin on the surface of the fixed plate welded joint 6, and the hook at the other end of the first spring (9) is fixedly connected to the side of the lower interlock plate welded assembly (8).

5. A mechanical interlock for a self-locking access door opening mechanism of a switchgear cabinet according to claim 4, characterized in that: One end of the second spring (10) is fixedly connected in the bent notch on the surface of the fixed plate welded joint (6), and the hook at the other end of the second spring (10) is fixedly connected to the side of the upper interlock plate welded assembly (7).

6. A mechanical interlock for a self-locking shutter opening mechanism of a switch cabinet according to claim 1, characterized in that: The self-locking bracket (17) is fixedly connected to the surface of the fixed plate welded joint (6). A round hole is opened in the middle of the surface of the self-locking plate (11), and an elastic cylindrical pin (15) is fixedly connected in the round hole in the middle of the surface of the self-locking plate (11). Square holes are opened at the bent parts at both ends of the self-locking bracket (17). The side of the self-locking plate (11) is adapted to the inner walls of the square holes at both ends of the bent self-locking bracket (17). A long round hole is opened in the middle of the surface of the self-locking bracket (17), and the inner wall of the long round hole on the surface of the self-locking bracket (17) is slidably connected to the side of the elastic cylindrical pin (15).

7. A mechanical interlock for a self-locking access door opening mechanism of a switchgear cabinet according to claim 6, characterized in that: The long circular hole at one end of the unlocking plate (12) is movably sleeved on the outside of the elastic cylindrical retaining pin (15). The circular hole on the surface of the unlocking plate (12) is aligned with the circular hole on the surface of the self-locking bracket (17). A cushion sleeve (13) is provided at the circular part on the upper surface of the unlocking plate (12), and a bracket sleeve (14) is provided at the circular hole on the lower surface of the unlocking plate (12). The circular hole on the surface of the unlocking plate (12), the circular hole on the surface of the self-locking bracket (17), the bracket sleeve (14), and the cushion sleeve (13) are connected by a long bolt (18). An unlocking torsion spring (16) is also sleeved on the outside of the long bolt (18).

8. A mechanical interlock for a self-locking access door opening mechanism of a switchgear cabinet according to claim 7, characterized in that: One end of the unlocking torsion spring (16) is fixedly connected to the side surface of the elastic cylindrical retaining pin (15), and the other end of the unlocking torsion spring (16) is adapted to the notch on the side surface of the self-locking bracket (17).

Images