CN113417509B

CN113417509B - Interlocking device

Info

Publication number: CN113417509B
Application number: CN202110687031.9A
Authority: CN
Inventors: 白冰; 李琛玫; 王显洲; 丁伟民; 卢玉丹; 张鹏
Original assignee: CRRC Zhuzhou Locomotive Co Ltd
Current assignee: CRRC Zhuzhou Locomotive Co Ltd
Priority date: 2021-06-21
Filing date: 2021-06-21
Publication date: 2022-10-14
Anticipated expiration: 2041-06-21
Also published as: CN113417509A

Abstract

The invention discloses an interlocking device which comprises an anti-falling rod movably connected with a cabinet body, wherein the anti-falling rod comprises a cross rod and end rods fixedly connected to two ends of the cross rod, and waist-shaped holes are formed in the end rods; the interlocking device also comprises a lock body component and an interlocking box; the lock body component fixed on the cabinet body comprises a bolt hole, a lock tongue and a key hole for accommodating a safety interlocking key; the interlocking box comprises a limiting pin, an unlocking bolt and a lock tongue cavity for accommodating a lock tongue; when the interlocking box is installed on the lock body assembly through the fastener, the limiting pin is inserted into the kidney-shaped hole of the end rod; when the safety interlocking key rotates to a first position, the bolt extends into the bolt cavity; when the safety interlock key is rotated to the second position, the deadbolt is withdrawn from the deadbolt cavity and the interlock box can be removed from the lock body assembly by removing the fastener. This application accessible mechanical structure realizes the function of safety interlocking and cabinet door secondary anticreep, and compromise simultaneously and have good waterproof, dustproof protect function to the lock body.

Description

Interlocking device

Technical Field

The invention relates to an interlocking device, in particular to an interlocking device of an equipment cabinet under a rail transit vehicle.

Background

High voltage, heavy current electrical equipment of track traffic vehicle often concentrate to arrange in the car in the equipment box, for guaranteeing that electrical equipment overhauls safety and the cabinet door in service accident drops, need set up safety interlock and secondary anticreep device in the equipment cabinet.

The safety interlocking device is arranged, namely, the safety interlocking key can be taken only when no electricity exists in the equipment cabinet, so that the equipment cabinet is opened for overhauling and maintenance work, and the danger caused by live working of maintenance personnel is avoided; when the equipment cabinet is overhauled and the cabinet door is locked, the safety interlocking key can be taken out to recover the power supply of the vehicle. In the past project, considering the dirty environmental conditions under the vehicle and the condition that the lock body is easily blocked by dust, the equipment cabinet door lock is closed by a compression type door lock with a special-shaped key, and the door lock key and the safety interlocking key are welded in a key ring to realize the safety interlocking function. The defect of the scheme is that the compression type door lock has no locking function on the key, namely the safety interlocking key can be pulled out when the cabinet door is not locked, so that the equipment cabinet recovers the electrified state and has potential safety hazard, only the safety interlocking function when the equipment cabinet is opened is realized, and the safety interlocking function is not played when the equipment cabinet door is closed. As disclosed in patent document 1 (publication No. CN109184384 a), a compression type door lock is used. The problem that it exists is exactly that can extract the safety interlock key when the cabinet door is not locked to probably lead to the equipment cabinet to unexpected the recovery electrified.

Secondary anticreep device sets up, and the cabinet door needs carry out the design of secondary anticreep promptly, and when appearing cabinet door self locking device and inefficacy, the cabinet door does not take place to drop under the effect of secondary anticreep device, avoids because the cabinet door drops and leads to unexpected emergence such as vehicle derail. In the past, often set up between cabinet door and the cabinet body and prevent falling the rope, this scheme defect lies in, need lift off the rope that prevents falling of every cabinet door when opening the cabinet door, and the process is loaded down with trivial details, and loses easily.

A novel interlocking and protecting device suitable for an equipment cabinet under a vehicle in the field of rail transit is needed. The device accessible mechanical structure realizes the function of safety interlocking and cabinet door secondary anticreep, and compromise simultaneously and have good waterproof, dustproof protect function to the lock body.

Disclosure of Invention

In order to realize the functions of safety interlocking and secondary anti-falling of the cabinet door in the opening and closing states of the cabinet door, the invention provides an interlocking device, and the specific technical scheme is as follows.

An interlocking device comprises an anti-falling rod movably connected with a cabinet body, wherein the anti-falling rod comprises a cross rod and end rods fixedly connected to two ends of the cross rod, the anti-falling rod is U-shaped, waist-shaped holes are formed in the end rods, and the anti-falling rod is movably connected with the cabinet body through the waist-shaped holes; the method is characterized in that: the interlocking device also comprises a lock body assembly and an interlocking box;

the lock body assembly fixed on the cabinet body comprises a bolt hole, a lock tongue and a key hole for accommodating a safety interlocking key;

the interlocking box comprises a limiting pin, an unlocking bolt and a lock tongue cavity for accommodating the lock tongue;

when the interlocking box is installed on the lock body assembly through a fastener, the limiting pin is inserted into the waist-shaped hole of the end rod, the anti-falling rod can prevent the cabinet door of the cabinet body from being opened, the unlocking bolt is inserted into the bolt hole, the lock body assembly is in an unlocking state, and the safety interlocking key inserted into the key hole can rotate; when the safety interlocking key rotates to a first position, the bolt extends into the bolt cavity, and the safety interlocking key can be pulled out of the key hole; when the safety interlocking key rotates to the second position, the bolt withdraws from the bolt cavity, the interlocking box can be detached from the lock body assembly by detaching the fastener, the anti-drop rod can remove the opening limit of the cabinet door of the cabinet body after the interlocking box is detached, and the safety interlocking key cannot be pulled out from the key hole after the interlocking box is detached from the lock body assembly.

Further, a pin shaft or a screw fixed on the cabinet body penetrates through the waist-shaped hole to realize the movable connection of the anti-falling rod and the cabinet body.

Further, a bracket is arranged on the cabinet body, and the bracket is provided with a groove for supporting the cross rod.

Furthermore, the lock body assembly further comprises a sealing gasket, the interlocking box is provided with an inner sealing coaming plate corresponding to the sealing gasket, and when the interlocking box is installed on the lock body assembly, the inner sealing coaming plate is abutted to the sealing gasket. The sealing gasket and the inner sealing coaming together perform waterproof protection on the lock body assembly.

Furthermore, the interlocking box further comprises an outer sealing enclosing plate which is located on the periphery of the inner sealing enclosing plate, a sealing strip is inserted into the outer sealing enclosing plate, and when the interlocking box is installed on the lock body assembly, the sealing strip abuts against the cabinet body. The sealing strip can protect the inside of the whole interlocking box from water.

Further, the limiting pin is located outside the outer sealing enclosing plate. Preferably, a U-shaped limiting groove is further fixedly arranged outside the outer seal enclosing plate, and the limiting pin is fixed in the U-shaped limiting groove; when the interlock box is installed in the lock body assembly, a portion of the end rod is positioned within the U-shaped limiting groove. The U-shaped limiting groove and the limiting pin can limit the anti-falling rod to rotate relative to the cabinet body, so that the cabinet door of the cabinet body is prevented from being opened, and secondary anti-falling protection is performed on the cabinet door.

Further, interlocking box still has and is cylindric key protection cover mount pad, the safety interlocking key can pass the key protection cover mount pad inserts in the key hole, key protection cover mount pad threaded connection has key protection cover. After the safety interlocking key is pulled out of the key hole, the key protection cover is installed on the key protection cover installation seat, and the interlocking box is protected from water and dust.

The principle of the interlock of the present invention is as follows.

Only after the whole car cuts off the power supply, can open the cabinet door:

only after the whole vehicle is powered off, the safety interlocking key can be pulled out from the key box and used for unlocking an interlocking device of the equipment cabinet under the vehicle. And inserting the safety interlocking key, rotating the lock body, and contracting the lock tongue, so that the lock tongue is released, the interlocking box is limited, and the interlocking box is removed. After the interlocking box is removed, the unlocking bolt and the interlocking box leave the bolt hole of the lock body assembly together, and at the moment, the safety interlocking key is locked in the lock body assembly and cannot be pulled out, namely, the whole vehicle cannot be electrified; after the interlocking box is removed, the limiting of the anti-falling rod is removed by the interlocking box, the anti-falling rod can be lifted and fall down, the limiting of the anti-falling rod to the cabinet door is removed, the cabinet door is opened, and the maintenance is carried out under the condition of no electricity.

Only after closing the cabinet door, can the whole car circular telegram:

after the equipment cabinet is overhauled and maintained, the cabinet door is locked, the anti-falling rod is reset, and the interlocking box is correctly installed. During the unblock bolt entered into the bolt hole of lock body subassembly, activation lock body subassembly, the safety interlocking key is rotatable, and the spring bolt stretches out under the rotation of safety interlocking key and enters into the spring bolt chamber and carry out spacingly to the interlocking box, and the safety interlocking key could only extract from the lock body this moment, and the interlocking box carries on spacingly to the anticreep pole, and the anticreep pole can not rotate (remove), and the anticreep pole carries on spacingly to the cabinet door. At the moment, the safety interlocking key can be pulled out of the lock body assembly, and the safety interlocking key is inserted into the key box, so that the whole vehicle is electrified.

The anticreep pole is locked in the cabinet door outside by safety interlock, carries out spacing protection to the cabinet door, and when the locking device of cabinet door self became invalid, the cabinet door did not take place to drop under the effect of anticreep pole.

The invention realizes the functions of safety interlocking and secondary anti-falling of the cabinet door through a mechanical structure, and simultaneously has good waterproof and dustproof protection functions on the lock body; the overhaul safety of the equipment cabinet under the rail transit vehicle is reliably ensured.

Drawings

FIG. 1 is a schematic view of an interlock device according to the present invention;

FIG. 2 is a schematic structural view of the fixing frame;

FIG. 3 is a schematic structural view of the anti-slip bar;

FIG. 4 is a schematic structural view of the bracket;

figure 5 is a schematic structural view of the lock body assembly;

FIG. 6 is a schematic view of the structure of the mounting plate;

FIG. 7 is a schematic view of the gasket construction;

FIG. 8 is a schematic structural view of the lock body;

figure 9 is a schematic view of an interlock box;

figure 10 is a schematic view of the interlock box from another perspective;

figure 11 is a schematic view of the installation of the interlock device of the present invention in the use state one (the state where the interlock box is disengaged from the lock body assembly);

figure 12 is a schematic view of the installation of the interlock device of the present invention in the second use condition (the condition in which the interlock box is installed in the lock body assembly).

In the figure: the lock comprises a fixed frame 1, an anti-drop rod 2, a bracket 3, a lock body component 4, a cabinet body 5, a cabinet door 6, a screw 7, a safety interlocking key 8, a through hole 11, a nut seat 12, an open slot 13, an end rod 21, a kidney-shaped hole 22, a cross rod 23, a groove 31, a mounting plate 41, a sealing gasket 42, a bolt hole 43, a bolt 44, a first mounting hole 411, a sealing groove 412, a lock mounting hole 413, an interlocking box 51, a sealing strip 52, a key protection cover 53, an outer sealing coaming 511, a U-shaped limiting groove 512, a limiting pin 513, a bolt cavity 514, a bolt locking hole 515, a second mounting hole 516, a key protection cover mounting seat 517, an inner sealing coaming 518 and an unlocking bolt 519.

Detailed Description

The present invention is described in further detail below with reference to the attached drawing figures.

As shown in fig. 1, the equipment cabinet (cabinet) under the vehicle in the rail transit field is substantially a rectangular parallelepiped, a cabinet door 6 is arranged on a cabinet body 5, the cabinet door 6 can be turned upwards (or leftwards or rightwards) to be opened, and a lock (not shown) for locking the cabinet door 6 is arranged on the cabinet door 6. The cabinet body 5 is provided with a fixed frame 1, an anti-drop rod 2, a bracket 3 and a lock body component 4, and the lock body component 4 is provided with an interlocking box 51.

As shown in fig. 2, the fixing frame 1 is a cubic structure, and is welded and fixed on the cabinet body 5, and mainly includes: a through hole 11, a nut seat 12 and an open groove 13; the nut seat 12 is positioned inside the fixed frame 1, and the through hole 11 of the fixed frame 1 and the nut seat 12 are coaxially arranged; the nut seat 12 has an internal threaded hole; the open slot 13 is positioned between the nut seat 12 and the through hole 11; the screw 7 (fastener) is screwed into the nut seat 12 through the through hole 11, and the screw can be used as a shaft (bolt) for movably positioning the anti-drop rod on the cabinet body 5; in fig. 1, the cabinet body 5 is provided with fixing frames 1 at two sides of the cabinet door 6.

As shown in fig. 3, the anti-falling rod 2 includes a cross rod 23 and end rods 21 fixedly connected to both ends of the cross rod 23, the anti-falling rod is U-shaped, a waist-shaped hole 22 is formed in the end rod 21, the screw 7 passes through the waist-shaped hole 22, the anti-falling rod 22 can rotate around the screw 7 under the condition that no other constraint is applied, the anti-falling rod 22 can also perform translational motion (the screw 7 translates relative to the waist-shaped hole 22), that is, the anti-falling rod 22 is movably connected with the cabinet 5 through the waist-shaped hole 22. As will be appreciated by those skilled in the art: the fixing frame 1 can be eliminated, and only a bolt passing through the waist-shaped hole 22 is fixedly arranged on the cabinet body 5.

As shown in fig. 4, the bracket 3 is provided with a groove 31 for supporting the cross rod 23, when the cross rod 23 is located in the groove 31, the outward translational motion of the anti-falling rod 22 relative to the cabinet 5 (cabinet door 6) is limited by the groove, at this time, if not constrained by other constraints, the anti-falling rod 22 can rotate upward relative to the cabinet 5, and then move outward relative to the cabinet 5 so as to break away from the support (constraint) of the bracket 3, at this time, the cross rod 23 of the anti-falling rod 22 can be moved to the lower side of the cabinet door 6, and the anti-falling constraint of the anti-falling rod 22 on the cabinet door 6 is removed.

As shown in fig. 5-7, the lock body assembly 4 basically includes: mounting plate 41, gasket 42, and a lock body including a bolt hole 43, a deadbolt 44, and a key hole (not shown) for receiving safety interlock key 8.

The mounting plate 41 may be fixed to the cabinet 5 by welding, and mainly includes: a first mounting hole 411, a sealing groove 412, a lock mounting hole 413, the first mounting hole 411 and the lock mounting hole 413 having internal threaded holes; the lock body is secured to the mounting plate 41 through the lock mounting hole 413. The seal 42 is embedded in the seal groove 412, the seal 42 is disposed around the body of the lock body, and the seal 42 is made of a sealing material having a thickness and a compression amount, as shown in fig. 7.

Only after the unlocking pin 519 is properly inserted into the pin hole 43 can the safety interlock key 8 be inserted into the keyway and the lock cylinder rotated to retract or extend the deadbolt 44. The lock body assembly 4 with the bolt holes 43 is prior art.

As shown in fig. 9 to 11, the interlock box 51 mainly includes: the lock comprises an outer sealing coaming 511, a U-shaped limiting groove 512, a limiting pin 513, a lock tongue cavity 514, a lock tongue locking hole 515, a second mounting hole 516, a key protection cover mounting seat 517, an inner sealing coaming 518 and an unlocking bolt 519. Wherein, the second mounting hole 516 is a through hole, and the fastener passes through the second mounting hole 516 to connect with the first mounting hole 411, so as to detachably fix the interlocking box 51 on the lock body assembly 4; when the interlocking box 51 is installed on the lock body assembly 4 through a fastener, the limiting pin 513 is inserted into the kidney-shaped hole 22 of the end rod (and a part of the end rod is located in the U-shaped limiting groove, the U-shaped limiting groove and the limiting pin can limit the rotation of the anti-falling rod relative to the cabinet body), the anti-falling rod 2 cannot rotate around the cabinet body 5 at this time, and the anti-falling rod 2 can prevent the cabinet door 6 of the cabinet body 5 from being opened; when the interlock box 51 is installed in the lock body assembly 4, the inner sealing fence 518 abuts against the gasket 42, and the gasket 42 and the inner sealing fence 518 together provide water-proof protection for the lock body; the sealing strip 52 is inserted into the outer sealing enclosing plate 511, the sealing strip 52 is a hollow sealing piece, when the interlocking box 51 is installed on the lock body assembly 4, the sealing strip 52 abuts against the cabinet body 5, and the sealing strip 52 can protect the inside of the whole interlocking box 51 from water. The lock tongue cavity 514 is fixedly arranged on the outer surface of the inner sealing coaming 518, the inner sealing coaming 518 is provided with a lock tongue locking hole 515, and the lock tongue 44 can penetrate through the lock tongue locking hole 515 to enter the lock tongue cavity 514; as will be appreciated by those skilled in the art: the bolt cavity 514 may be located elsewhere on the interlock box 51 and may only receive the bolt 44. The U-shaped limiting groove is fixedly arranged on the outer surface of the outer sealing surrounding plate 511, the limiting pin 513 is fixed in the U-shaped limiting groove 512, when the interlocking box 51 is installed on the lock body assembly 4, the U-shaped limiting groove 512 just can cover a part of the end rod 21, and the limiting pin 513 is inserted into the kidney-shaped hole 22.

Key protection cover mount pad 517 is cylindricly to have the external screw thread, safety interlocking key 8 can pass key protection cover mount pad 517 and insert in the key hole, and key protection cover 53 is for being provided with the internal thread, and after safety interlocking key 8 was pulled out from the key hole, installed key protection cover 53 on key protection cover mount pad 517, carries out waterproof dustproof protection to interlock box 51.

The assembly process of the interlock is as follows:

step 1: symmetrically welding the fixed frame 1 on two sides of the equipment cabinet;

and 2, step: welding the end bars 21 to both ends of the cross bar 23 to form the anti-drop bars 2;

and step 3: welding the bracket 3 on the outer surface of the equipment cabinet body;

and 4, step 4: welding the mounting plates 41 to two sides of the equipment cabinet, wherein the mounting plates are close to the fixing frame 1, fixing the lock body main body on the mounting plates 41 by using fasteners, and then installing the sealing gaskets 42 on the sealing grooves 412 of the mounting plates 41, so as to complete the installation and fixation of the lock body assembly 4;

and 5: the sealing strip 52 is wrapped (inserted) on the outer sealing enclosing plate 511, and then the internal thread on the key protection cover 53 is screwed with the external thread on the key protection cover mounting seat 517, so that the sealing effect on the safety interlocking key of the lock body is achieved, and the assembly of the interlocking box 51 is completed;

and 6: the end rod 21 penetrates into the open slot 13, the cross rod 23 falls into the groove 31, and the waist-shaped hole 22 is fastened with the nut seat 12 by the screw 7, wherein the length of the screw 7 is required to be larger than the depth of the internal thread of the nut seat 12, so that the nut seat can play a role of a rotating shaft;

and 7: the interlocking box 51 is fastened with the lock body assembly 4 by using a fastener, at this time, the unlocking bolt 519 is inserted into the bolt hole 43, the lock body is activated, the retraction and the extension of the bolt 44 can be controlled by the rotation of the safety interlocking key 8, meanwhile, the limiting pin 513 is inserted into the kidney-shaped hole 22 and limits the position of the kidney-shaped hole, the U-shaped limiting groove 512 limits the end rod 21, and the assembly of the interlocking device is completed.

The interlocking device of the invention has the following working principle and effects.

To the realization of safety interlocking function when opening the cabinet door:

the whole car needs to be powered off, the safety interlocking key 8 can be taken, the key protection cover 53 is opened, the safety interlocking key 8 is inserted and rotated, the bolt 44 contracts to withdraw from the bolt cavity 514 and the bolt locking hole 515, a fastener on the interlocking box 51 is removed, and the interlocking box 51 is further removed, at the moment, the unlocking bolt 519 leaves the bolt hole 43 of the lock body main body, the safety interlocking key 8 is locked on the lock body assembly 4, the U-shaped limiting groove 512 and the limiting pin 513 remove the limitation on the anti-falling rod 2, the anti-falling rod 2 rotates by taking the screw 7 as an axis, is lifted upwards through the open slot 13, and is pulled outwards through the kidney-shaped hole 22, so that the limiting effect of the groove 31 on the cross rod 23 is removed, the cross rod 23 is positioned below the cabinet door after falling, and the aim of opening the cabinet door is fulfilled.

The realization of safety interlocking function when closing the cabinet door:

need close the cabinet door earlier and use screw 7 to be rotatory as the axle anti-disengaging rod 2, arrange horizontal pole 23 in recess 31, and installation interlocking box 51, the unblock bolt 519 on the interlocking box 51 gets into the bolt hole 43 of lock body subassembly 4 this moment, lock body subassembly 4 is activated, can rotate safety interlocking key 8, it lets spring bolt 44 pass after spring bolt lock obturator hole 515 enters into lock tongue chamber 514 to rotate safety interlocking key 8, just can extract safety interlocking key 8, really realize closing all cabinet doors and place good back to anti-disengaging rod 2, just can make whole car resume electrified state with safety interlocking key 8.

Have good waterproof dustproof protect function to lock body subassembly 4. After the fasteners on the interlocking box 51 are installed, the sealing strip 52 installed on the outer sealing enclosing plate 511 is in pressing contact with the cabinet 5, and a first resealing effect is achieved on the lock body assembly 4. A second, resealing action is provided to the lock body assembly by the abutting engagement of the inner seal fence 518 with the seal gasket 42 mounted at the seal groove 412. Latch cavity 514 seals against latch bolt 44. Internal threads on the key protection cover 53 are matched with external threads on the key protection cover mounting seat 517, and a sealing effect is achieved on the safety interlocking key 8.

It should be noted that: the lock body assembly 4 and the interlocking box 51, if any, may be provided on only one side of the cabinet 5, or may be provided on both sides of the cabinet 5.

The embodiments of the present invention are described above with reference to the drawings, and the embodiments and features of the embodiments of the present invention may be combined with each other without conflict. The present invention is not limited to the above-described embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many modifications without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. The interlocking device comprises an anti-falling rod (2) movably connected with a cabinet body (5), wherein the anti-falling rod (2) comprises a cross rod (23) and end rods (21) fixedly connected to two ends of the cross rod (23), the anti-falling rod (2) is U-shaped, waist-shaped holes (22) are formed in the end rods (21), and the anti-falling rod (2) is movably connected with the cabinet body (5) through the waist-shaped holes (22); the method is characterized in that: the interlocking device also comprises a lock body component (4) and an interlocking box (51);

the lock body assembly (4) fixed on the cabinet body (5) comprises a bolt hole (43), a bolt (44) and a key hole for accommodating a safety interlocking key (8);

the interlocking box (51) comprises a limiting pin (513), an unlocking bolt (519) and a bolt cavity (514) for accommodating the bolt (44);

when the interlocking box (51) is installed on the lock body assembly (4) through a fastener, the limiting pin (513) is inserted into the waist-shaped hole (22) of the end rod (21), the anti-falling rod (2) can prevent the cabinet door of the cabinet body (5) from being opened, the unlocking bolt (519) is inserted into the bolt hole (43), the lock body assembly (4) is in an unlocking state, and the safety interlocking key (8) inserted into the key hole can rotate; when the safety interlocking key (8) is rotated to a first position, the bolt (44) extends into the bolt cavity (514), and the safety interlocking key (8) can be pulled out of a key hole; when the safety interlocking key (8) is rotated to a second position, the bolt (44) is withdrawn from the bolt cavity (514), the interlocking box (51) can be detached from the lock body assembly (4) by detaching the fastener, the anti-falling rod (2) can release the opening limit of the cabinet door of the cabinet body (5) after the interlocking box (51) is detached, and the safety interlocking key (8) cannot be pulled out of the keyhole after the interlocking box (51) is detached from the lock body assembly (4);

and a pin shaft or a screw (7) fixed on the cabinet body (5) penetrates through the waist-shaped hole (22) to realize the movable connection between the anti-falling rod (2) and the cabinet body (5).

2. An interlocking device according to claim 1, characterized in that a bracket (3) is provided on the cabinet body (5), said bracket (3) having a recess (31) for supporting the crossbar (23).

3. An interlock device according to claim 1, wherein said lock body assembly (4) further comprises a gasket (42), said interlock box (51) having an internal sealing collar (518) disposed in correspondence with said gasket (42), said internal sealing collar (518) abutting said gasket (42) when said interlock box (51) is installed in said lock body assembly (4).

4. An interlocking device according to claim 3, characterized in that the interlocking box (51) further comprises an outer sealing enclosure (511) located at the periphery of the inner sealing enclosure (518), a sealing strip (52) is inserted into the outer sealing enclosure (511), and the sealing strip (52) abuts against the cabinet body (5) when the interlocking box (51) is mounted in the lock body assembly (4).

5. An interlocking device according to claim 4, characterised in that the limiting pin (513) is located outside the outer sealing fence (511).

6. An interlocking device according to claim 5, characterized in that a U-shaped limiting groove (512) is fixedly arranged outside the outer sealing coaming (511), and the limiting pin (513) is fixed in the U-shaped limiting groove (512); when the interlocking box (51) is installed on the lock body assembly (4), a part of the end rod (21) is positioned in the U-shaped limiting groove (512).

7. An interlocking device as claimed in claim 1, characterized in that said interlocking box (51) further has a key protection cover mounting seat (517) in the shape of a cylinder, said safety interlocking key (8) being insertable into said keyway through said key protection cover mounting seat (517), said key protection cover mounting seat (517) being threadedly connected with a key protection cover (53).