CN218769175U

CN218769175U - Interlocking mechanism for plug-in cabinet door of upper isolation lower circuit breaker switch cabinet

Info

Publication number: CN218769175U
Application number: CN202222794063.1U
Authority: CN
Inventors: 徐一鸣; 黄佩浩; 陈利克; 徐敏敏
Original assignee: Zhejiang Liange Electrical Technology Co ltd
Current assignee: Zhejiang Liange Electrical Technology Co ltd
Priority date: 2022-10-21
Filing date: 2022-10-21
Publication date: 2023-03-28
Anticipated expiration: 2032-10-21

Abstract

The utility model relates to an upper isolation lower circuit breaker switch cabinet plug-in cabinet door interlocking mechanism, which comprises a cabinet body, a lower door and an interlocking component, wherein the interlocking component comprises an interlocking rod, a grounding lower door interlocking group, a lower door interlocking plate and a lower door threshold group; the interlocking rod is provided with a limiting convex ring which is in a lower threshold group, when the lower door is opened, the lower threshold group limits the interlocking rod to move downwards, the lower door interlocking plate moves upwards along with the interlocking rod and abuts against a brake-separating half shaft operated by the circuit breaker, the lower door interlocking plate can limit the brake-separating half shaft to execute brake-separating action, when the lower door is closed, the lower threshold group is freely matched with the limiting convex ring, and one end of the interlocking rod penetrates into an interlocking hole of the lower door due to self weight. The utility model has the advantages of simple structure, stable and reliable performance, simple operation, low cost, safety and reliability.

Description

Interlocking mechanism for plug-in cabinet door of upper isolation lower circuit breaker switch cabinet

Technical Field

The utility model relates to a cubical switchboard technical field, concretely relates to plug-in cabinet door interlocking device of circuit breaker switch cabinet under upper isolation.

Background

The main function of the switch cabinet is to open and close, control and protect electric equipment in the process of power generation, power transmission, power distribution and electric energy conversion of an electric power system. The components in the switch cabinet mainly comprise a circuit breaker, an isolating switch, a load switch, an operating mechanism, a mutual inductor, various protection devices and the like. The method is mainly suitable for various occasions such as power plants, transformer substations, petrochemical industry, metallurgical steel rolling, light industrial textile, industrial and mining enterprises, residential districts, high-rise buildings and the like. In an electric power transmission and transformation system, a switch cabinet is very important electric equipment in an electric power system, and once misoperation occurs, equipment is damaged slightly, and electric power system faults are caused seriously, even personal life safety is harmed, so that a ring main unit has a perfect and reliable five-prevention interlocking function, and the safe operation of the person and a power grid is ensured.

The switch cabinet is internally provided with an isolating switch, an isolating switch operating mechanism, a circuit breaker and a circuit breaker operating mechanism, the isolating switch operating mechanism controls a cutter bar in the isolating switch to work among three stations of isolating switch-on, isolating switch-off (simultaneously, grounding switch-off) and grounding switch-on, and the circuit breaker operating mechanism controls a vacuum bubble in the circuit breaker to perform the operation of switch-off and switch-on. The upper isolation lower circuit breaker switch cabinet ensures the following two points in order to ensure the safety during operation; 1. when the cabinet door is in a closed state and the grounding operation shaft rotates to the grounding opening position, the cabinet door cannot be opened; 2. ensure that the cabinet door when open mode, the circuit breaker can not carry out the separating brake.

When the switch cabinet operates, the cabinet door is required to be closed, the charged body is sealed in the cable chamber, personal safety is protected, the switch cabinet door interlocking mechanism is a set of interlocking device which is arranged between the cabinet door and the three-station disconnecting switch and the vacuum circuit breaker on the basis of preventing the charged body from entering the charged space by mistake, the switch cabinet operates in a power-on mode, and once the cabinet door is correctly locked, the cabinet door cannot be opened unless violently damaged. The existing cabinet door interlocking mechanism is unreasonable in structural design, when a cabinet door is not closed in place or a lower door is violently pulled, the cabinet door interlocking mechanism fails due to accommodation, safety accidents are easily caused, and therefore the cabinet door interlocking mechanism has the defects of unreliable performance and low safety.

Disclosure of Invention

An object of the utility model is to overcome prior art's defect, provide a simple structure, stable performance is reliable, simple operation, with low costs, safe and reliable's plug-in cabinet door interlocking device of circuit breaker cubical switchboard under last isolation.

In order to achieve the above object, the utility model discloses an upper isolation lower circuit breaker switch cabinet plug-in cabinet door interlocking device, including the cabinet body, lower door, interlocking assembly include but longitudinal movement and with the interlocking lever of the interlocking hole matched with of lower door, with keep apart operating device's ground connection operating axis complex ground connection lower door interlocking group, the linkage sets up on the interlocking lever and with circuit breaker operating device's divide-shut brake operating axis complex lower door interlocking plate, set up in the cabinet body and with interlocking lever complex lower threshold group, ground connection operating axis, divide-shut brake operating axis rotate respectively to the separating brake position time, ground connection lower door interlocking group, lower door interlocking plate restriction interlocking lever upward movement, and can realize the locking of interlocking lever and lower door; the interlocking rod is provided with a limiting convex ring which is in a lower threshold group, when the lower door is opened, the lower threshold group limits the interlocking rod to move downwards, the lower door interlocking plate moves upwards along with the interlocking rod and abuts against a brake-separating half shaft operated by the circuit breaker, the lower door interlocking plate can limit the brake-separating half shaft to execute brake-separating action, when the lower door is closed, the lower threshold group is freely matched with the limiting convex ring, and one end of the interlocking rod is inserted into an interlocking hole of the lower door due to self weight.

The beneficial effect of above-mentioned structure is: this cabinet door interlocking device adopts bayonet structural design, and the interlocking is more reliable, can avoid opening the lower door because of the door is gone down to the violence, and only when the lower door closed in place, lower threshold group could with the interlocking lever unblock to the interlocking lever penetrates the interlocking hole of lower door because of self gravity, can avoid live-line operation, thereby this cabinet door interlocking device's security is higher. And the interlocking group of the grounding lower door of the cabinet door interlocking mechanism can realize the interlocking of the isolation operating mechanism and the lower door, and the interlocking group of the grounding lower door has simple structural design, better strength and better interlocking reliability. When the grounding operation shaft rotates to the switching-on position, the interlocking rod loses the limit of the grounding lower door interlocking group, and the interlocking rod can move upwards, so that the lower door can be opened. The lower threshold group can realize reliable locking or unlocking of the lower door, the isolation operating mechanism and the circuit breaker operating mechanism, when the lower door is opened, the lower threshold group limits the interlocking rod to move downwards, the interlocking rod can lock the opening half shaft through the lower door interlocking plate to avoid the opening operation of the circuit breaker operating mechanism, and after the lower door is closed in place, the lower threshold group is freely matched with the interlocking rod, the interlocking rod is inserted into an interlocking hole of the lower door due to self gravity, and interlocking of the interlocking rod and the lower door is realized. Therefore, the cabinet door interlocking mechanism has the advantages of simple structure, stable and reliable performance, convenience in operation, low cost, safety and reliability.

Especially, lower threshold group including set up at the internal support of cabinet, slide the limiting plate that sets up on the support, set up the extension spring between limiting plate and support, limiting plate one end have with spacing bulge loop matched with lock tongue portion, limiting plate one end have with lower door matched with drive division, the lower door close the time, the lower door contradict on the drive division, and can realize the free cooperation of lock tongue portion and spacing bulge loop, the lower door open the time, lock tongue portion block on spacing bulge loop, and constitute the spacing cooperation of lock tongue portion and spacing bulge loop. The lower door threshold group can realize reliable locking or unlocking of the lower door, the isolation operation mechanism and the circuit breaker operation mechanism, and is favorable for improving the safety performance of the cabinet door interlocking mechanism. When the lower door is closed in place, the lower door is driven to move by the limiting plate of the lower threshold group, the limiting plate is unlocked with the limiting convex ring of the interlocking rod, the interlocking rod is inserted into the interlocking hole of the lower door due to self gravity, after the lower door is opened, the limiting lug moves along with the interlocking rod, the limiting plate loses the limiting of the lower door, the lock tongue part of the limiting plate abuts against the lower end of the limiting convex ring, so that the lower door and the interlocking rod are unlocked, only after the lower door is closed in place, the interlocking rod can be inserted into the interlocking hole of the lower door, and the safety performance of the cabinet door interlocking mechanism is greatly improved.

Particularly, the ground connection lower door interlocking group including the linkage set up on the ground connection operating axis cam, slide and set up on keeping apart operating device and with cam matched with locating part, the locating part including corresponding interlocking lever department slide set up on keeping apart operating device gag lever post, the linkage set up on the gag lever post and with cam matched with deflector, the deflector along with the cam action and can drive the gag lever post action, and the gag lever post is contradicted on the interlocking lever post, and constitute the spacing cooperation of gag lever post and interlocking lever post. The grounding lower door interlocking set is simple in structural design, reliable in interlocking and higher in strength. When the grounding operation shaft rotates to the brake separating position, the cam abuts against the guide plate, the guide plate drives the limiting rod to abut against the interlocking rod, the interlocking rod is inserted into the interlocking hole of the lower door, the lower door is locked by the interlocking rod, and the lower door cannot be opened. When the grounding operation shaft rotates to the switching-on position, the guide plate loses the limitation of the cam, and the interlocking rod can move upwards, so that the lower door is unlocked.

Particularly, the lower door interlocking plate on have with separating brake semi-axis matched with first spacing portion, separating brake semi-axis on the linkage be provided with first spacing portion matched with lockplate, first spacing portion along with lower door interlocking plate rebound and can contradict on the lockplate, and constitute the spacing cooperation of lockplate and first spacing portion. When the opening and closing operation shaft is located at the opening position, the first limiting part of the lower door interlocking plate abuts against the locking plate, and the opening and closing half shaft cannot rotate to the opening position, so that the safety performance of the cabinet door interlocking mechanism is improved.

Particularly, the lower door interlocking plate is provided with a second limiting part matched with the switching-on and switching-off operating shaft, a stop block matched with the second limiting part is arranged on the switching-on and switching-off operating shaft in a linkage mode, when the switching-on and switching-off operating shaft rotates to the switching-off position, the stop block moves along with the switching-on and switching-off operating shaft and can abut against the second limiting part, limiting matching of the stop block and the second limiting part is formed, and when the switching-on and switching-off operating shaft rotates to the switching-on position, the stop block is freely matched with the second limiting part. The lower door interlocking plate is provided with a second limiting part matched with the stop block on the opening and closing operation shaft, when the opening and closing operation shaft is positioned at the opening position, the locking of the circuit breaker and the lower door can be realized, and the lower door cannot be opened, so that the interlocking reliability and the safety of the cabinet door interlocking mechanism can be improved.

Particularly, a guide groove is formed in the lower door interlocking plate, a support matched with the lower door interlocking plate is arranged on the circuit breaker operating mechanism, a guide rail matched with the guide groove is arranged on the support, and the guide groove is arranged on the guide rail in a sliding mode and forms sliding connection matching of the lower door interlocking plate and the support. The guide groove of the lower door interlocking plate is arranged on the support in a sliding mode, so that the lower door interlocking plate can reliably slide on the support, and the working reliability of the cabinet door interlocking mechanism is improved.

Particularly, the support is provided with guide posts matched with the lower door interlocking plate, the lower door interlocking plate is provided with sliding holes matched with the guide posts, and the guide posts are inserted into the sliding holes and form sliding connection matching of the guide posts and the lower door interlocking plate. The guide post on the bracket can play a role in guiding the lower door interlocking plate, so that the lower door interlocking plate can be ensured to reliably act, and the working reliability of the cabinet door interlocking mechanism can be improved.

Drawings

Fig. 1 is a perspective view of the internal structure of the switch cabinet according to the embodiment of the present invention.

Fig. 2 is a front view of the internal structure of the switch cabinet according to the embodiment of the present invention.

Fig. 3 isbase:Sub>A sectional view taken along linebase:Sub>A-base:Sub>A of fig. 2.

Fig. 4 is a perspective view of the embodiment of the present invention.

Fig. 5 is the assembly of the lower door interlocking plate and the bracket according to the embodiment of the present invention.

Fig. 6 is a perspective view of a threshold group according to an embodiment of the present invention.

Detailed Description

As shown in fig. 1 to 6, an embodiment of the present invention is an upper isolation lower circuit breaker switch cabinet plug-in type cabinet door interlocking mechanism, including a cabinet body 10, a lower door 11, and an interlocking component 20, where the interlocking component 20 includes an interlocking rod 21 which can move longitudinally and is matched with an interlocking hole 111 of the lower door 11, a grounding lower door interlocking group 30 which is matched with a grounding operating shaft 120 of an isolation operating mechanism 12, a lower door interlocking plate 22 which is arranged on the interlocking rod 21 in a linkage manner and is matched with a switching-on/off operating shaft 130 of a circuit breaker operating mechanism 13, and a lower door threshold group 40 which is arranged in the cabinet body 10 and is matched with the interlocking rod 21, and when the grounding operating shaft 120 and the switching-off operating shaft 130 rotate to a switching-off position respectively, the interlocking rod 21 is limited by the interlocking rod 30 and the lower door interlocking plate 22 to move upward, and the interlocking rod 21 and the lower door 11 can be locked; the interlocking rod 21 is provided with a limiting convex ring 211 corresponding to the lower threshold group 40, when the lower door 11 is opened, the lower threshold group 40 limits the interlocking rod 21 to move downwards, the lower door interlocking plate 22 moves upwards along with the interlocking rod 21 and abuts against a tripping half shaft 131 of the circuit breaker operation 13, the lower door interlocking plate 22 can limit the tripping half shaft 131 to perform a tripping action, when the lower door 11 is closed, the lower threshold group 40 is freely matched with the limiting convex ring 211, and one end of the interlocking rod 21 penetrates through an interlocking hole 111 of the lower door 11 due to self weight.

As shown in fig. 1, 3, and 4, the lower door threshold group 40 includes a bracket 41 disposed in the cabinet 10, a limiting plate 42 slidably disposed on the bracket 41, and a tension spring 43 disposed between the limiting plate 42 and the bracket 41, one end of the limiting plate 42 has a locking tongue portion 421 cooperating with the limiting convex ring 211, one end of the limiting plate 42 has a driving portion 422 cooperating with the lower door 11, when the lower door 11 is closed, the lower door 11 abuts against the driving portion 422, and the locking tongue portion 421 can freely cooperate with the limiting convex ring 211, and when the lower door 11 is opened, the locking tongue portion 421 is engaged with the limiting convex ring 211, and forms a limiting engagement between the locking tongue portion 421 and the limiting convex ring 211. The lower door threshold group can realize reliable locking or unlocking of the lower door, the isolation operation mechanism and the circuit breaker operation mechanism, and is favorable for improving the safety performance of the cabinet door interlocking mechanism. When the lower door is closed in place, the lower door is driven to move by the limiting plate of the lower threshold group, the limiting plate is unlocked with the limiting convex ring of the interlocking rod, the interlocking rod is inserted into the interlocking hole of the lower door due to self gravity, after the lower door is opened, the limiting lug moves along with the interlocking rod, the limiting plate loses the limiting of the lower door, the lock tongue part of the limiting plate abuts against the lower end of the limiting convex ring, so that the lower door and the interlocking rod are unlocked, only after the lower door is closed in place, the interlocking rod can be inserted into the interlocking hole of the lower door, and the safety performance of the cabinet door interlocking mechanism is greatly improved.

As shown in fig. 1 and 2, the grounding lower door interlock set 30 includes a cam 31 installed on the grounding operation shaft 120 in an interlocking manner, and a limiting member 32 installed on the isolation operation mechanism 12 in a sliding manner and engaged with the cam 31, wherein the limiting member 32 includes a limiting rod 321 installed on the isolation operation mechanism 12 in a sliding manner corresponding to the interlocking rod 21, and a guide plate 322 installed on the limiting rod 321 in an interlocking manner and engaged with the cam 31, the guide plate 322 moves along with the cam 31 and drives the limiting rod 321 to move, and the limiting rod 321 abuts against the interlocking rod 21 to form a limiting engagement between the limiting rod 321 and the interlocking rod 21. The grounding lower door interlocking group is simple in structural design, reliable in interlocking and higher in strength. When the grounding operation shaft rotates to the brake separating position, the cam abuts against the guide plate, the guide plate drives the limiting rod to abut against the interlocking rod, the interlocking rod is inserted into the interlocking hole of the lower door, the lower door is locked by the interlocking rod, and the lower door cannot be opened. When the grounding operation shaft rotates to the switching-on position, the guide plate loses the limitation of the cam, and the interlocking rod can move upwards, so that the lower door is unlocked.

As shown in fig. 2 and 5, the lower door interlock plate 22 has a first limit portion 221 engaged with the opening half shaft 131, the opening half shaft 131 is provided with a lock plate 132 engaged with the first limit portion 221 in a linkage manner, the first limit portion 221 moves upward along with the lower door interlock plate 22 and can abut against the lock plate 132, and the limit engagement between the lock plate 132 and the first limit portion 221 is formed. When the opening and closing operation shaft is located at the opening and closing position, the first limiting part of the lower door interlocking plate abuts against the locking plate, and the opening and closing half shaft cannot rotate to the opening and closing position, so that the safety performance of the cabinet door interlocking mechanism is improved. The lower door interlocking plate 22 is provided with a second limiting part 222 matched with the switching-on/off operation shaft 130, the switching-on/off operation shaft 130 is provided with a stop dog 133 matched with the second limiting part 222 in a linkage manner, when the switching-on/off operation shaft 130 rotates to a switching-off position, the stop dog 133 moves along with the switching-on/off operation shaft 130 and can be abutted against the second limiting part 222, and limit matching of the stop dog 133 and the second limiting part 222 is formed, and when the switching-on/off operation shaft 130 rotates to the switching-on position, the stop dog 133 and the second limiting part 222 are freely matched. The lower door interlocking plate is provided with a second limiting part matched with the stop block on the opening and closing operation shaft, when the opening and closing operation shaft is positioned at the opening position, the locking of the circuit breaker and the lower door can be realized, and the lower door cannot be opened, so that the interlocking reliability and the safety of the cabinet door interlocking mechanism can be improved. The lower door interlocking plate 22 is provided with a guide groove 223, the breaker operating mechanism 13 is provided with a bracket 132 matched with the lower door interlocking plate 22, the bracket 132 is provided with a guide rail 1321 matched with the guide groove 223, and the guide groove 223 is arranged on the guide rail 1321 in a sliding manner and forms sliding connection matching of the lower door interlocking plate 22 and the bracket 132. The guide groove of the lower door interlocking plate is arranged on the support in a sliding mode, so that the lower door interlocking plate can reliably slide on the support, and the working reliability of the cabinet door interlocking mechanism is improved. The bracket 132 is provided with a guide post 133 matched with the lower door interlocking plate 22, the lower door interlocking plate 22 is provided with a sliding hole 224 matched with the guide post 133, and the guide post 133 is inserted in the sliding hole 224 and forms sliding connection and matching of the guide post 133 and the lower door interlocking plate 22. The guide post on the bracket can play a role in guiding the lower door interlocking plate, so that the lower door interlocking plate can be ensured to reliably act, and the working reliability of the cabinet door interlocking mechanism can be improved.

This cabinet door interlocking device adopts bayonet structural design, and the interlocking is more reliable, can avoid opening the lower door because of the door is gone down to the violence, and only when the lower door closed in place, lower threshold group could with the interlocking lever unblock to the interlocking lever penetrates the interlocking hole of lower door because of self gravity, can avoid live-line operation, thereby this cabinet door interlocking device's security is higher. And the grounding lower door interlocking group of the cabinet door interlocking mechanism can realize interlocking of the isolation operating mechanism and the lower door, has simple structural design, better strength and better interlocking reliability, and can limit the interlocking rod to move upwards when the grounding operating shaft rotates to the opening position, so that the interlocking rod can reliably lock the lower door and the lower door cannot be opened. When the grounding operation shaft rotates to the switching-on position, the interlocking rod loses the limit of the grounding lower door interlocking group, and the interlocking rod can move upwards, so that the lower door can be opened. The lower threshold group can realize reliable locking or unlocking of the lower door, the isolation operating mechanism and the circuit breaker operating mechanism, when the lower door is opened, the lower threshold group limits the interlocking rod to move downwards, the interlocking rod can lock the opening half shaft through the lower door interlocking plate to avoid the opening operating mechanism from executing opening operation, and after the lower door is closed in place, the lower threshold group is freely matched with the interlocking rod, and the interlocking rod is inserted into an interlocking hole of the lower door due to self gravity to realize interlocking of the interlocking rod and the lower door. Therefore, the cabinet door interlocking mechanism has the advantages of simple structure, stable and reliable performance, convenience in operation, low cost, safety and reliability.

Claims

1. An upper isolation lower circuit breaker switch cabinet plug-in type cabinet door interlocking mechanism comprises a cabinet body, a lower door and an interlocking assembly, and is characterized in that the interlocking assembly comprises an interlocking rod which can move longitudinally and is matched with an interlocking hole of the lower door, a grounding lower door interlocking group which is matched with a grounding operating shaft of an isolation operating mechanism, a lower door interlocking plate which is arranged on the interlocking rod in a linkage manner and is matched with a switching-off and switching-on operating shaft of the circuit breaker operating mechanism, and a lower threshold group which is arranged in the cabinet body and is matched with the interlocking rod, when the grounding operating shaft and the switching-on and switching-off operating shaft respectively rotate to switching-off positions, the grounding lower door interlocking group and the lower door interlocking plate limit the upward movement of the interlocking rod and can realize the locking of the interlocking rod and the lower door; the interlocking rod is provided with a limiting convex ring which is in a lower threshold group, when the lower door is opened, the lower threshold group limits the interlocking rod to move downwards, the lower door interlocking plate moves upwards along with the interlocking rod and abuts against a brake-separating half shaft operated by the circuit breaker, the lower door interlocking plate can limit the brake-separating half shaft to execute brake-separating action, when the lower door is closed, the lower threshold group is freely matched with the limiting convex ring, and one end of the interlocking rod is inserted into an interlocking hole of the lower door due to self weight.

2. The interlocking mechanism for the plug-in cabinet door of an upper isolation lower circuit breaker switchgear of claim 1, wherein: lower threshold group including set up at the internal support of cabinet, slide limiting plate, the extension spring of setting between limiting plate and support of setting on the support, limiting plate one end have with spacing bulge loop matched with lock tongue, limiting plate one end have with lower door matched with drive division, lower door when closing, the lower door contradict on the drive division, and can realize the free cooperation of lock tongue and spacing bulge loop, lower door when opening, lock tongue block on spacing bulge loop, and constitute the spacing cooperation of lock tongue and spacing bulge loop.

3. The interlock mechanism for upper and lower isolating circuit breaker switchgear cabinet plug-in doors according to claim 1 or 2, characterized in that: ground connection lower door interlock group including the linkage set up on ground connection operating axis cam, slip set up on keeping apart operating device and with cam matched with locating part, the locating part including corresponding the gag lever post of interlocking lever department slip setting on keeping apart operating device, the linkage set up on the gag lever post and with cam matched with deflector, the deflector along with cam action and can drive the gag lever post action, and the gag lever post is contradicted on the interlocking lever, and constitutes the spacing cooperation of gag lever post and interlocking lever.

4. The interlock mechanism for upper and lower isolating circuit breaker switchgear cabinet plug-in doors according to claim 1 or 2, characterized in that: lower door interlocking plate on have with the first spacing portion of separating brake semi-axis matched with, separating brake semi-axis on the linkage be provided with first spacing portion matched with lockplate, first spacing portion along with lower door interlocking plate rebound and can contradict on the lockplate, and constitute the spacing cooperation of lockplate and first spacing portion.

5. The interlock mechanism for upper and lower isolating circuit breaker switchgear cabinet plug-in doors according to claim 1 or 2, characterized in that: the lower door interlocking plate is provided with a second limit part matched with the opening and closing operating shaft, the opening and closing operating shaft is provided with a stop block matched with the second limit part in a linkage mode, the opening and closing operating shaft rotates to the opening position, the stop block moves along with the opening and closing operating shaft and can be abutted to the second limit part, the stop block is in limit fit with the second limit part, and the opening and closing operating shaft rotates to the opening position and is freely matched with the second limit part.

6. The interlock mechanism for upper and lower isolating circuit breaker switchgear cabinet plug-in doors according to claim 1 or 2, characterized in that: the lower door interlocking plate is provided with a guide groove, the circuit breaker operating mechanism is provided with a support matched with the lower door interlocking plate, the support is provided with a guide rail matched with the guide groove, and the guide groove is arranged on the guide rail in a sliding mode and forms sliding connection matching of the lower door interlocking plate and the support.

7. The interlock mechanism according to claim 6, wherein: the support is provided with a guide post matched with the lower door interlocking plate, the lower door interlocking plate is provided with a sliding hole matched with the guide post, and the guide post is inserted into the sliding hole and forms sliding connection matching of the guide post and the lower door interlocking plate.