Handcart operation interlocking device and switch cabinet

Abstract

The invention relates to the technical field of switch cabinets, in particular to a handcart operation interlocking device and a switch cabinet. The handcart operation interlocking device comprises a fixed plate, a movable plate and a switch device, the fixed plate is used for being fixedly installed on a handcart chamber door, an installation gap is formed between the fixed plate and the handcart chamber door, and the movable plate is installed in the installation gap in a sliding mode and is provided with an electric driving position and a manual driving position in the sliding stroke of the movable plate. The movable plate shields the handcart operation hole and triggers the switch device to be closed when sliding to the electric driving position, the movable plate avoids the handcart operation hole and switches off the switch device when sliding to the manual driving position, a guide groove is formed in the fixed plate, and the movable plate is installed in the guide groove in a guiding and sliding mode. The two side groove walls and the groove bottom face, used for guiding the movable plate, of the guide groove are all continuous planes, the continuous guiding effect can be provided for the movable plate, the contact area between the movable plate and the groove wall face of the guide groove is large, and therefore the better guiding effect can be provided for the movable plate.

Description

Technical Field

[0001] This invention relates to the field of switchgear technology, and in particular to a handcart operation interlocking device and switchgear. Background Technology

[0002] Circuit breaker trolleys are an important component of switchgear. A circuit breaker trolley consists of a chassis and the circuit breaker mounted on it. The chassis moves the circuit breaker back and forth, switching it between operating and test positions. Existing chassis typically include a motor, a sliding frame, and a screw and nut mechanism. The sliding frame slides within the switchgear, and the nut of the screw and nut mechanism is fixed to the sliding frame. Rotating the screw causes the nut to move linearly along its axis, moving the sliding frame and the circuit breaker back and forth. There are two ways to drive the screw: one is manual operation, where a dedicated operating handle is inserted into the trolley's operating hole; the other is electric operation, where the motor drives the screw. For safety, manual operation is prohibited during electric operation, and vice versa.

[0003] Chinese utility model patent CN219371851U discloses a drive interlocking device and an intelligent switch cabinet incorporating it. The drive interlocking device includes a switch device, a pressing structure (i.e., a movable plate), and a mounting structure (i.e., a fixed plate). The mounting structure is fixedly installed on the cabinet with a preset gap between it and the cabinet. The pressing structure is slidably disposed within this preset gap. The pressing structure has a pressing part and a blocking part. Within its sliding stroke, the pressing structure has an automatic drive position (i.e., an electric drive position) and a manual drive position (i.e., a manual drive position). When the pressing structure slides to the automatic drive position, its blocking part blocks the handcart operation hole on the cabinet, preventing the insertion of the operating handle. Simultaneously, its pressing part presses the switch device to a closed state, energizing the drive motor and enabling electric operation of the handcart. When the pressing structure slides to the manual drive position, its blocking part avoids the handcart operation hole on the cabinet, allowing the operating handle to be inserted. Simultaneously, its pressing part moves away from the switch device, disengaging the switch device and de-energizing the drive motor, allowing only manual operation.

[0004] The aforementioned existing drive interlocking device can prevent manual and electric operation of the handcart from occurring simultaneously, avoiding conflict between the two operation methods and damage to the switchgear. However, it has the following problems: the fixed plate is fixedly installed on the enclosure by multiple fasteners, and the movable plate is slidably installed in the preset gap between the fixed plate and the enclosure. Multiple fasteners are distributed on opposite sides of the preset gap to guide the sliding of the movable plate. Since the guiding contact area between each fastener and the movable plate is very small, and adjacent fasteners on the same side are spaced a certain distance apart, the guiding effect on the movable plate is poor. The movable plate may still deviate during the sliding process, affecting its pressing reliability on the switch device, thus causing safety risks during handcart operation. Summary of the Invention

[0005] The purpose of this invention is to provide a handcart operation interlocking device to solve the problem of poor guiding effect on the movable plate in existing handcart drive interlocking devices; the purpose of this invention is also to provide a switch cabinet to solve the problem of safety risks in handcart operation caused by the poor guiding effect of the movable plate in existing switch cabinet handcart drive interlocking devices.

[0006] To achieve the above objectives, the handcart operation interlocking device of the present invention adopts the following technical solution: A handcart operation interlocking device includes a fixed plate, a movable plate, and a switch device. The fixed plate is fixedly installed on the handcart compartment door and has an installation gap between it and the handcart compartment door. The movable plate is slidably installed within the installation gap and has an electric drive position and a manual drive position within its sliding stroke. When the movable plate slides to the electric drive position, it blocks the handcart operation hole and triggers the switch device to close. When the movable plate slides to the manual drive position, it avoids the handcart operation hole and the switch device is disengaged. The fixed plate is provided with a guide groove, and the movable plate is slidably installed in the guide groove.

[0007] Furthermore, the fixing plate includes a fixing base plate and upper and lower pads spaced apart on one side of the fixing base plate. The upper and lower pads protrude from the surface of the fixing base plate and form a long groove extending left and right on one side of the fixing base plate. The long groove constitutes the guide groove.

[0008] Furthermore, the fixed plate is also equipped with an auxiliary guide structure for assisting in guiding the movable plate.

[0009] Furthermore, the auxiliary guide structure is a guide hole, and the movable plate is provided with a contact for triggering the switch device, and the contact is guided and movably installed in the guide hole.

[0010] Furthermore, the switching device is fixedly installed on the side of the fixed plate facing away from the movable plate, and the contact ear extends inward beyond the guide hole to trigger the contact of the switching device.

[0011] Furthermore, the movable plate includes a movable base plate, which is a rectangular plate. The upper and lower long sides of the movable base plate are guided and slidably engaged with the guide groove. One end of the top of the movable base plate is provided with an L-shaped folded ear. One side of the L-shaped folded ear is fixedly connected to the movable base plate, and the other side extends perpendicularly to the surface of the movable base plate. The side of the L-shaped folded ear perpendicular to the movable base plate is guided and movably inserted into the guide hole and extends inward out of the guide hole. The L-shaped folded ear constitutes the contact ear.

[0012] Furthermore, the fixed plate is equipped with a grounding structure, which is electrically connected to the grounding component on the handcart compartment door.

[0013] Furthermore, the grounding structure is a grounding stud fixedly mounted on a fixed plate.

[0014] Furthermore, the switching device is a micro switch.

[0015] Beneficial Effects: This invention is an improved invention. The fixed plate is fixedly installed on the handcart compartment door and has an installation gap between it and the door. The movable plate is slidably installed within the installation gap and has an electric drive position and a manual drive position within its sliding stroke. When the movable plate slides to the electric drive position, it blocks the handcart operation hole and triggers the switch to close, connecting the electric drive circuit. At this time, only electric operation can be performed. When the movable plate slides to the manual drive position, it avoids the handcart operation hole and the switch to open, disconnecting the electric drive circuit. At this time, the operating handle can be inserted for manual operation, but electric operation is not possible. By setting guide grooves on the fixed plate, the movable plate is slidably installed in the guide grooves, allowing the movable plate to slide along the guide grooves. The opposite side walls of the guide grooves cooperate with the upper and lower sides of the movable plate to guide the movable plate. The bottom surface of the guide groove and the handcart door are located on the inner and outer sides of the movable plate to limit and guide the movable plate. The side walls and bottom surface of the guide grooves used to guide the movable plate are all continuous planes, which can provide continuous guidance for the movable plate. Moreover, the movable plate has a large contact area with the groove wall surface of the guide groove, thus providing a better guiding effect for the movable plate.

[0016] The switchgear of this invention adopts the following technical solution: The switch cabinet includes a cabinet body, inside which a handcart is installed. The handcart is equipped with a handcart operation interlocking device, which includes a fixed plate, a movable plate, and a switch device. The fixed plate is fixedly installed on the handcart compartment door and has an installation gap between it and the handcart compartment door. The movable plate is slidably installed within the installation gap and has an electric drive position and a manual drive position within its sliding stroke. When the movable plate slides to the electric drive position, it blocks the handcart operation hole and triggers the switch device to close. When the movable plate slides to the manual drive position, it avoids the handcart operation hole and the switch device is disengaged. The fixed plate is provided with a guide groove, and the movable plate is slidably installed in the guide groove.

[0017] Furthermore, the fixing plate includes a fixing base plate and upper and lower pads spaced apart on one side of the fixing base plate. The upper and lower pads protrude from the surface of the fixing base plate and form a long groove extending left and right on one side of the fixing base plate. The long groove constitutes the guide groove.

[0018] Furthermore, the fixed plate is also provided with an auxiliary guide structure for assisting in guiding the movable plate.

[0019] Furthermore, the auxiliary guide structure is a guide hole, and the movable plate is provided with a contact for triggering the switch device, and the contact is guided and movably installed in the guide hole.

[0020] Furthermore, the switching device is fixedly installed on the side of the fixed plate facing away from the movable plate, and the contact ear extends inward beyond the guide hole to trigger the contact of the switching device.

[0021] Furthermore, the movable plate includes a movable base plate, which is a rectangular plate. The upper and lower long sides of the movable base plate are guided and slidably engaged with the guide groove. One end of the top of the movable base plate is provided with an L-shaped folded ear. One side of the L-shaped folded ear is fixedly connected to the movable base plate, and the other side extends perpendicularly to the surface of the movable base plate. The side of the L-shaped folded ear perpendicular to the movable base plate is guided and movably inserted into the guide hole and extends inward out of the guide hole. The L-shaped folded ear constitutes the contact ear.

[0022] Furthermore, the fixed plate is equipped with a grounding structure, which is electrically connected to the grounding component on the handcart compartment door.

[0023] Furthermore, the grounding structure is a grounding stud fixedly mounted on a fixed plate.

[0024] Furthermore, the switching device is a micro switch.

[0025] Beneficial Effects: This invention is an improved invention. A fixed plate is fixedly installed on the handcart compartment door with an installation gap between it and the door. A movable plate is slidably installed within the installation gap and has an electric drive position and a manual drive position within its sliding stroke. When the movable plate slides to the electric drive position, it blocks the handcart operation hole and triggers a switch to close, connecting the electric drive circuit; at this time, only electric operation is possible. When the movable plate slides to the manual drive position, it avoids the handcart operation hole and the switch to open, disconnecting the electric drive circuit; at this time, the operating handle can be inserted for manual operation, but electric operation is not possible. By setting guide grooves on the fixed plate, the movable plate is slidably installed in the guide grooves, allowing the movable plate to slide along the guide grooves. The opposite side walls of the guide grooves cooperate with the upper and lower sides of the movable plate to guide the movable plate. The bottom surface of the guide groove and the handcart door are located on the inner and outer sides of the movable plate to limit and guide the movable plate. The side walls and bottom surface of the guide grooves used to guide the movable plate are all continuous planes, which can provide continuous guidance for the movable plate. Moreover, the movable plate has a large contact area with the groove wall surface of the guide groove, thus providing a better guiding effect for the movable plate and ensuring that the movable plate accurately triggers the switch device to close or open when it slides to the corresponding position, thereby improving operational safety. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the handcart operation interlocking device installed on the handcart compartment door in an embodiment of the switchgear of the present invention; Figure 2 A front view of the handcart operation interlocking device; Figure 3 Rear view of the handcart's operating interlocking device; Figure 4 An exploded view of the handcart operation interlocking device; Figure 5 This is a structural diagram of the fixed plate; Figure 6 A structural schematic diagram of the fixed plate from another perspective; Figure 7 This is a schematic diagram of the structure of the fixed substrate; Figure 8 for Figure 7 The front view of the fixed substrate shown; Figure 9 for Figure 7 Side view of the fixed substrate shown; Figure 10 for Figure 7 Top view of the fixed substrate shown; Figure 11 This is a schematic diagram of the movable plate structure; Figure 12 This is a structural diagram of the front cover. Figure 13 This is the front view of the front cover. Figure 14 This is a side view of the front cover. In the diagram: 1. Handcart compartment door; 101. Handcart operation hole; 2. Front cover plate; 201. Front cover plate padlock part; 202. Front cover plate padlock hole; 203. Front cover plate mounting hole; 3. Movable plate; 301. Movable base plate; 302. L-shaped folding lug; 303. Movable plate mounting hole; 304. Movable plate padlock part; 305. Movable plate padlock hole; 4. Fixed plate; 401. Fixed base plate; 4011. Flat plate part; 4012. L-shaped bending part; 402. Grounding stud; 403. Bushing; 404. Upper pad plate; 405. Lower pad plate; 406. Guide groove; 407. Fixed plate mounting hole; 408. Guide hole; 409. Switch mounting hole; 5. Switch device; 6. Fixing bolt; 7. Grounding component. Detailed Implementation

[0027] This invention primarily addresses the safety risks associated with switchgear operation caused by the poor guiding effect of existing handcart drive interlocking devices on the movable plate. The basic inventive concept is to slide the movable plate within the installation gap between the fixed plate and the handcart compartment door, and to provide a guide groove on the fixed plate. The movable plate is guided and slidably installed within the guide groove, and the groove wall continuously guides the movable plate, increasing the contact area between the movable plate and the groove wall. This optimizes the guiding effect on the movable plate and improves the safety of handcart operation.

[0028] Based on the above-described principles, the embodiments of the present invention will be described in detail below.

[0029] Embodiments of the switchgear of the present invention: The switch cabinet includes a cabinet body, and a handcart is installed inside the cabinet, such as... Figure 1 As shown, the handcart includes a handcart compartment door 1, which has a handcart operation hole 101 for inserting an operating handle, and is equipped with a handcart operation interlocking device, which is installed at the handcart operation hole 101. Figure 2-4As shown, the handcart operation interlocking device includes components such as a front cover plate 2, a movable plate 3, a fixed plate 4, and a switch device 5. The front cover plate 2 is installed on the outside of the handcart compartment door 1, and the fixed plate 4 is installed on the inside of the handcart compartment door 1. The front cover plate 2 and the fixed plate 4 are fixedly installed on the handcart compartment door 1 by four fixing bolts 6. There is an installation gap between the fixed plate 4 and the handcart compartment door 1, and the movable plate 3 is slidably installed within this installation gap. The switch device 5 is fixedly installed on the upper side of the fixed plate 4. The switch device 5 is connected to the electric drive circuit. When the movable plate 3 slides left and right, it triggers the switch device 5 to close or open, thereby controlling the on / off of the electric drive circuit. When the electric drive circuit is connected, it can supply power to the drive motor, thereby enabling electric operation of the handcart. The movable plate 3 has an electric drive position and a manual drive position within its sliding stroke. When the movable plate 3 slides to the left to the electric drive position, it blocks the handcart operation hole 101 and triggers the switch device 5 to close, connecting the electric drive circuit. At this time, the handcart is in electric operation mode, and manual operation is prohibited. When the movable plate 3 slides to the right to the manual drive position, it avoids the handcart operation hole 101 and the switch device 5 is disengaged, disconnecting the electric drive circuit. At this time, the operating handle can be inserted into the handcart operation hole 101 for manual operation, and electric operation is prohibited. By sliding the movable plate 3 left and right, the two operation modes of manual and electric operation of the handcart are clearly separated, improving the operational reliability of the switch cabinet interlocking.

[0030] like Figure 4 As shown, the fixed plate 4 is provided with a guide groove 406, and the movable plate 3 is slidably installed in the guide groove 406 to guide the sliding of the movable plate 3. The opposite side walls of the guide groove 406 cooperate with the upper and lower sides of the movable plate 3 to guide the movable plate 3. The bottom surface of the guide groove 406 and the handcart door 1 are respectively located on the inner and outer sides of the movable plate 3 to limit and guide the movable plate 3. The side walls and bottom surface of the guide groove 406 used to guide the movable plate 3 are all continuous planes, which can provide continuous guidance for the movable plate 3. Moreover, the movable plate 3 and the groove wall surface of the guide groove 406 have a large contact area, thus providing a better guiding effect for the movable plate 3 and ensuring that the movable plate 3 accurately triggers the switch device 5 to close or open when it slides to the corresponding position, thereby improving operational safety.

[0031] The structure of the fixed plate is as follows Figure 5-6As shown, the structure includes a fixed base plate 401, a bushing 403, an upper pad 404, and a lower pad 405. Both the upper and lower pads are rectangular plates, positioned vertically and opposite each other on one side of the fixed base plate 401, protruding from the surface of the fixed base plate 401 to form a long, horizontally extending groove on one side of the fixed base plate 401. This long groove constitutes the aforementioned guide groove 406, resulting in a simple structure that is easy to manufacture. The bushing 403 is fixedly mounted on the other side of the fixed base plate 401. The fixed base plate 401 has a mounting hole 407, and the bushing 403 is fixed to and communicates with the mounting hole 407. The four corners of the fixed plate 405 have bolt mounting holes for mounting bolts 6. After the fixed plate 405 is fixedly mounted onto the handcart door 1, the mounting holes 407 are directly opposite and communicate with the handcart operation hole 101. The fixed plate 4 is also equipped with a grounding structure, specifically a grounding stud 402. The grounding stud 402 is fixedly installed on the fixed plate 4 and is electrically connected to the grounding component 7 on the handcart compartment door 1 via a cable. This ensures continuous and effective electrical grounding of the handcart operation interlocking device and the switchgear cabinet, improving the operational safety of the switchgear. The grounding structure uses a grounding stud 402 for easy cable connection. Of course, in other embodiments, grounding protrusions, grounding springs, or other grounding structures can also be used.

[0032] The structure of the fixed substrate is as follows Figure 7-10 As shown, the fixed base plate 401 includes a flat plate portion 4011 and two L-shaped bent portions 4012 fixedly connected to the left and right ends of the flat plate portion 4011. A mounting hole 407 is located in the middle of the flat plate portion 4011. The fixed base plate 401 also has an auxiliary guiding structure for guiding the movable plate 3. Specifically, the auxiliary guiding structure is a guide hole 408. The movable plate 3 has a contact for triggering the switch device 5. The contact is guided and movably installed within the guide hole 408, so that the contact serves both as a triggering component for triggering the switch device 5 and as a guiding component for guiding and engaging with the guide hole 408. One component performs at least two functions simultaneously, thereby simplifying the overall structure of the device. By providing the auxiliary guiding structure, the guiding effect on the movable plate 3 can be further enhanced, making the guidance more reliable.

[0033] The fixed base plate 401 is also provided with a switch mounting hole 409 for mounting the switch device 5. The switch device 5 is fixedly mounted on the side of the fixed plate 4 facing away from the movable plate 3. The contact ear of the movable plate 3 is guided and movably inserted into the guide hole 408 and extends inward from the guide hole 408 to trigger the contact of the switch device 5. The switch device 5 and the movable plate 3 are respectively located on both sides of the fixed plate 4, which can avoid interference between the two and make the installation of the switch device 5 more convenient. At the same time, having the contact ear of the movable plate 3 extend inward from the guide hole 408 to trigger the contact of the switch device 5 helps to simplify the overall structure of the fixed plate 4. The switch device 5 is specifically a micro switch. When the movable plate 3 slides to the electric drive position, the contact ear triggers the switch device 5 to activate, connecting the electric drive circuit; when the movable plate 3 slides to the manual drive position, the contact ear triggers the switch device 5 to activate, disconnecting the electric drive circuit. Of course, in other embodiments, the switch device 5 can also be a limit switch or other switch devices 5.

[0034] The two L-shaped bends 4012 of the fixed base plate 401 can be used with the interlock on the chassis to realize the door closing operation interlock that the circuit breaker can only be operated after the handcart compartment door 1 is closed.

[0035] The structure of the movable plate is as follows Figure 11 As shown, the movable plate 3 includes a movable base plate 301, which is a rectangular plate. The upper and lower long sides of the movable base plate 301 are used for guiding and sliding cooperation with the two side walls of the guide groove 406 on the fixed plate 4, so that the movable base plate 301 and the two side walls of the guide groove 406 have a larger guiding contact area, making the guidance of the movable plate 3 more reliable and stable. One end of the top of the movable base plate 301 is provided with an L-shaped folded ear 302. One side of the L-shaped folded ear 302 is fixedly connected to the movable base plate 301, and the other side extends perpendicular to the plate surface of the movable base plate 301. The side of the L-shaped folded ear 302 perpendicular to the movable base plate 301 is guided and moved through the guide hole 408 of the fixed plate 4 and extends inward and outward from the guide hole 408, having a large guiding contact area with the guide hole 408. The L-shaped folded ear 302 constitutes the contact ear of the movable plate 3 for triggering the switch device 5. The contact ear structure is simple and easy to process, thus making the overall processing of the movable plate 3 more convenient. The movable base plate 301 is provided with a movable plate mounting hole 303. When the movable plate 3 slides to the electric drive position, the movable plate mounting hole 303 is offset from the handcart operation hole 101, and the movable base plate 301 blocks the handcart operation hole 101, preventing the operating handle from being inserted. When the movable plate 3 slides to the manual drive position, the movable plate mounting hole 303 is directly connected to the handcart operation hole 101, thus avoiding the handcart operation hole 101 and allowing the operating handle to be inserted. The movable base plate 301 is also provided with a movable plate padlock part 304 protruding outward from the movable base plate 301, and the movable plate padlock part 304 has two movable plate padlock holes 305 of different sizes.

[0036] The structure of the front cover is as follows Figure 12-14 As shown, the front cover plate 2 is a rectangular plate. Bolt mounting holes for fixing bolts 6 are provided at the four corners of the front cover plate 2. A front cover plate mounting hole 203 is provided in the center of the front cover plate 2. A front cover plate padlock part 201 protrudes outward from the front cover plate 2. The front cover plate padlock part 201 has two front cover plate padlock holes 202 of different sizes. Left and right arrow markings are provided below the front cover plate mounting holes 203 on the front cover plate 2, and left and right rotation arrow markings are provided above the front cover plate mounting holes 203. Figure 4 As shown, after the front cover plate 2 is installed on the handcart compartment door 1 using fixing bolts 6, the mounting hole 203 of the front cover plate is directly opposite and connected to the handcart operation hole 101. When the movable plate 3 slides to the left to its limit position, i.e., when the handcart is in electric operation mode, the padlock part 304 of the movable plate fits into the padlock part 201 of the front cover plate, and the padlock holes of the two correspond. The large padlock hole can be locked after being merged, and the small padlock hole can be sealed after being merged. The handcart can be locked in the electric operation state as needed by padlocking or sealing.

[0037] The handcart operation interlocking device of this invention, by controlling the left and right sliding of the movable plate 3, ensures a clear separation between manual and electric operation modes of the handcart, thus improving the operational reliability of the switchgear interlocking. By setting a guide structure on the fixed plate 4 to continuously guide the movable plate 3 and increasing the guide contact area between the movable plate 3 and the guide structure, the guiding effect on the movable plate 3 is optimized, further improving the safety of handcart operation. The handcart operation interlocking device of this invention is fully functional, safe, and reliable, meeting the safety and reliability requirements of power systems, especially the requirements for handcart operation interlocking devices used with electric chassis vehicles, effectively preventing electrical misoperation; its structure is reasonable, its manufacturing process is simple, its installation is convenient, and it is easy to widely promote and apply.

[0038] Of course, the switch cabinet of the present invention is not limited to the embodiments described above.

[0039] For example, in another embodiment, a fixing plate with a different structure is provided. The fixing plate specifically includes a fixing base plate, and a guide groove is formed by cutting a groove on one side of the fixing base plate. In this case, no upper and lower pads are provided, which reduces the number of parts.

[0040] For example, in another embodiment, a different auxiliary guiding structure is provided. A guide block is provided on the fixed plate, and a matching guide groove or guide hole is provided on the movable plate. The guide block is movably installed in the guide groove or guide hole. When the movable plate slides left and right, the guide groove or guide hole on it cooperates with the guide block to guide the movable plate and prevent it from tilting. The guide block constitutes an auxiliary guiding structure. As another example, in another embodiment, a guide hole is provided on the fixed plate as an auxiliary guiding structure. At the same time, a guide block adapted to the guide hole is provided on the movable plate. The guide block is movably installed in the guide hole. The two cooperate to guide the movable plate left and right to assist in guiding its movement. In this case, the lug on the movable plate only serves as a triggering component for triggering the switching device, ensuring that the fixed plate does not interfere with the movement of the lug.

[0041] For example, in another embodiment, the switch device can be fixedly installed on the upper or left side of the fixed plate, or it can be fixedly installed in the handcart compartment or on the handcart compartment door. The structure and position of the contact ear are adapted to make the contact ear guide movable in the guide hole on the fixed plate, and the contact ear triggers the contact of the switch device after the movable plate slides into place.

[0042] For example, in another embodiment, a contact ear with a different structure is provided, wherein a planar contact piece extending perpendicular to the surface of the movable substrate is provided on the movable substrate, and the planar contact piece is guided and movably inserted into the guide hole, and the planar contact piece constitutes the contact ear.

[0043] The present invention also provides an embodiment of a handcart operation interlocking device, the specific structure of which is the same as that of the handcart operation interlocking device in the above-described switchgear embodiment, and will not be described again here.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be determined by the claims. Similarly, any equivalent structural changes made based on the description and drawings of the present invention shall also be included within the scope of protection of the present invention.

Claims

1. A handcart operation interlocking device, comprising a fixed plate, a movable plate and a switch device, the fixed plate is fixedly installed on a handcart room door and has an installation gap with the handcart room door, the movable plate is slidingly installed in the installation gap and has an electric drive position and a manual drive position in its sliding stroke, the movable plate blocks a handcart operation hole and triggers the switch device to close when sliding to the electric drive position, the movable plate avoids the handcart operation hole and the switch device is disconnected when sliding to the manual drive position, characterized in that: The fixed plate is provided with a guide slot, and the movable plate is guided and slidably installed in the guide slot. ​ 2. The trolley operation interlock of claim 1, wherein: The fixed plate comprises a fixed base plate and upper and lower backing plates which are arranged on one side of the fixed base plate and extend leftward and rightward on one side of the fixed base plate.

3. A trolley operation interlock according to claim 1 or 2, characterised in that: The fixed plate is further provided with an auxiliary guide structure for assisting in guiding the movable plate.

4. The trolley operation interlock of claim 3, wherein: The auxiliary guide structure is a guide hole, and the movable plate is provided with a contact lug for triggering the switch device, and the contact lug is guided and movably installed in the guide hole.

5. The trolley operation interlock of claim 4, wherein: The switch device is fixedly installed on the side of the fixed plate which is away from the movable plate, and the contact lug extends inwardly out of the guide hole to trigger the contact of the switch device.

6. The trolley operation interlock of claim 5, wherein: The movable plate comprises a movable base plate which is a rectangular plate, and the upper and lower long edges of the movable base plate are guided and slidably matched with the guide slot, and the top end of the movable base plate is provided with an L-shaped folded lug, one side of the L-shaped folded lug is fixedly connected with the movable base plate, and the other side extends perpendicularly to the plate surface of the movable base plate, the side of the L-shaped folded lug which is perpendicular to the movable base plate is guided and movably installed in the guide hole and extends inwardly out of the guide hole, and the L-shaped folded lug constitutes the contact lug.

7. The trolley operation interlock of claim 1 or 2, wherein: The fixed plate is provided with a grounding structure which is electrically connected with a grounding member on the handcart room door.

8. The trolley operation interlock of claim 7, wherein: The grounding structure is a grounding stud which is fixedly installed on the fixed plate.

9. The trolley operation interlock of claim 1 or 2, wherein: The switch device is a micro switch.

10. A switchgear cabinet comprising a cabinet body, a handcart is arranged in the cabinet body, the handcart is provided with a handcart operation interlocking device, characterized in that: The handcart operation interlocking device is the handcart operation interlocking device according to any one of claims 1-9.

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