Spent fuel loading device with emergency function

Abstract

The application discloses a spent fuel loading device with an emergency function, and relates to the field of high-temperature gas cooled reactor loading and unloading devices. The spent fuel loading device with the emergency function comprises a main frame, a driving assembly and a loading tank. The connecting parts on the main frame are all made by using a welding process. The opening and closing of the loading tank cover are controlled by the driving assembly, and then the loading and unloading of the fuel from the loading tank are completed. The main frame is fixedly installed between a maintenance room floor and an operation room floor, and is used as a mechanism base. The main frame comprises guide rails arranged on the surface of the main frame. The guide rails extend from top to bottom on both sides of the main frame. An operation opening is arranged on the maintenance room floor, and a movable opening is arranged on the operation room floor. The driving assembly comprises a power piece arranged on the top of the main frame, a telescopic piece which is detachably connected with the power piece, and a locking piece which is fixedly installed on the telescopic piece. The telescopic piece slides on the guide rails, and the loading of the fuel can be realized by manual emergency means when the lifting mechanism motor fails.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-temperature gas cooled reactor loading and unloading, in particular to a spent fuel loading device with emergency function. BACKGROUND

[0002] The spent fuel loading device is an important equipment of the high-temperature gas cooled reactor, and its main function is to load the spent fuel balls discharged from the reactor core into the spent fuel storage tank according to the command. In normal operation, the spent fuel loading device is in a strong radioactive environment, so it is of great significance to design a spent fuel loading device with rapid emergency repair for the safe and stable operation of the system and the safety of the repair personnel.

[0003] The present application is directed to the above problems, and proposes a spent fuel loading device with emergency repair for high-temperature gas cooled reactor. The device can effectively reduce the radiation effect of the bottom spent fuel storage tank, meet the repair work of personnel approaching the drive motor, and solve the problem that the spent fuel loading device cannot be lifted when the lifting mechanism motor fails. SUMMARY

[0004] In view of the problems existing in the above-mentioned spent fuel loading device with emergency function, the present application is proposed.

[0005] Therefore, the problem to be solved by the present application is how to prevent pipe leakage.

[0006] To solve the above technical problems, the present application provides the following technical scheme: a spent fuel loading device with emergency function, comprising a main frame fixedly installed between a repair room floor and an operation room floor as a mechanism base, a guide rail provided on the surface of the main frame, the guide rail extending from top to bottom on both sides of the main frame, an operation opening provided on the repair room floor, and a movable opening provided on the operation room floor.

[0007] A drive assembly comprising a power component provided on the top of the main frame, a telescopic component detachably connected with the power component, and a locking component fixedly installed on the telescopic component, the telescopic component sliding on the guide rail.

[0008] A loading tank, wherein a material taking opening with the same caliber as the telescopic component is provided at the center of the loading tank, and a loading tank cover is provided on the material taking opening and can be taken out, the material taking opening being higher than the surface of the loading tank.

[0009] The loading tank is provided below the operation room floor, and the telescopic component can pass through the movable opening on the operation room floor to reach the material taking opening on the loading tank.

[0010] As a preferred scheme of the spent fuel loading device with emergency function, the end of the main frame is further provided with a feeding pipe extending from top to bottom, the other end of the feeding pipe is provided with a buffer pipe in the direction of the telescopic part, the lower side of the guide rail is further provided with a shock absorber, and each side of the guide rail at two different heights is provided with a pair of limiting piles.

[0011] As a preferred scheme of the spent fuel loading device with emergency function, the power part includes a motor fixedly installed on the main frame, a worm controlled by the motor, and a worm wheel matched with the worm, one side of the worm wheel is further provided with a sprocket coaxially rotating through a transmission shaft, one end of a ring chain on the sprocket is hung downward, and the end of the worm is provided with an operating head matched with a square rod controlled by a worker.

[0012] As a preferred scheme of the spent fuel loading device with emergency function, the telescopic part includes a mounting frame slidingly matched with the guide rail, the mounting frame is provided with a sleeve pipe extending into the inside of the loading tank, one side of the sleeve pipe is provided with a first bifurcated pipe matched and connected with the buffer pipe, the same side of the first bifurcated pipe is provided with a second bifurcated pipe, the second bifurcated pipe is provided with a screw cap, and the surface of the sleeve pipe is fixedly installed with a movable sleeve.

[0013] As a preferred scheme of the spent fuel loading device with emergency function, the telescopic part further includes a piston arranged in the inside of the sleeve pipe, the top of the piston is fixedly connected with the ring chain, the other end of the piston is fixedly connected with a claw through a connecting rod, and the claw is self-locked matched between the loading tank cover.

[0014] As a preferred scheme of the spent fuel loading device with emergency function, the telescopic part further includes a piston arranged in the inside of the sleeve pipe, the top of the piston is fixedly connected with the ring chain, the other end of the piston is fixedly connected with a claw through a connecting rod, and the claw is self-locked matched between the loading tank cover.

[0015] As a preferred scheme of the spent fuel loading device with emergency function, the locking part includes a fixed seat fixedly installed on both sides of the mounting frame, the fixed seat is fixedly installed with a cylinder, the piston rod of the cylinder is connected with a locking plate through a pin shaft, the tail of the cylinder is provided with a screw rod support, the screw rod support is installed with a screw rod, the end of the piston rod of the cylinder is connected with the screw rod through an unlocking connecting rod, the unlocking connecting rod has a long notch, and the piston rod of the cylinder can freely move.

[0016] As a preferred scheme of the spent fuel loading device with emergency function, the end of the locking plate is provided with a clamping groove matched with the limiting stake.

[0017] As a preferred scheme of the spent fuel loading device with emergency function, the locking member further comprises an anti-falling stake arranged on both sides of the guide rail, and a plurality of anti-falling grooves are arranged on the anti-falling stake.

[0018] As a preferred scheme of the spent fuel loading device with emergency function, the locking member further comprises a protection box fixedly connected with the mounting frame, a ejection port is arranged on one side of the protection box facing the anti-falling stake, the protection box further comprises a sensing stake fixedly connected with the inner wall of the box body through a first spring, a clamping plate is arranged at the end of the sensing stake, a moving groove is arranged on the clamping plate, and a spring stake is arranged in the moving groove and slides in the moving groove, one end of the spring stake is fixedly connected with the inner wall of the protection box through a compression spring, and the other end of the spring stake is embeddedly matched with the anti-falling groove.

[0019] The present application has the advantages that through cooperation of various components, manual emergency loading can be realized when the lifting mechanism motor fails, radioactive fuel is not in a stagnant state due to motor failure, a safety accident is reduced in a convenient and fast manner, and rapid braking can be realized when an operation error occurs, thereby greatly improving the safety index. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:

[0021] Figure 1 A scene diagram of the spent fuel loading device with emergency function.

[0022] Figure 2 A W enlarged view of the spent fuel loading device with emergency function.

[0023] Figure 3 A partial enlarged view of the spent fuel loading device with emergency function.

[0024] Figure 4 A partial sectional view of the spent fuel loading device with emergency function.

[0025] Figure 5The enlarged view of V of the spent fuel loading device with emergency function.

[0026] Figure 6 The enlarged view of M of the spent fuel loading device with emergency function.

[0027] Figure 7 The structure diagram of the power component of the spent fuel loading device with emergency function.

[0028] Figure 8 The structure diagram of the telescopic component of the spent fuel loading device with emergency function.

[0029] Figure 9 The structure diagram of the locking component of the spent fuel loading device with emergency function.

[0030] Figure 10 The internal structure diagram of the protective box of the spent fuel loading device with emergency function. DETAILED DESCRIPTION

[0031] In order to make the above objectives, features and advantages of the present application more apparent, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0032] In the following detailed description, many specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced without the specific details. In other instances, well-known methods, procedures, components, and circuits have not been described in detail so as not to obscure the present application. The present application is not intended to be limited to the details given herein, but includes all the features, advantages, and other modifications.

[0033] Next, the term "one embodiment" or "an embodiment" as used herein means that a particular implementation can include a particular feature, structure, or characteristic. However, the appearances of "in one embodiment" or "in an embodiment" at different places in the specification do not necessarily all refer to the same embodiment, and can refer to different embodiments.

[0034] Embodiment 1

[0035] Reference Figure 1 and Figure 2 In the first embodiment of the present application, the spent fuel loading device with emergency function is provided, which comprises a main frame 100, a driving assembly 200 and a loading tank 300. The connection parts of the main frame 100 are welded, the opening and closing of the loading tank cover 301 is controlled by the driving assembly 200, and then the loading and unloading of the fuel is completed in the loading tank 300.

[0036] Specifically, the main frame 100 is fixedly installed between the maintenance floor H and the operation floor P, and is used as a mechanism base, and the main frame 100 is provided with guide rails 101 on the surface of the main frame 100, the guide rails 101 extend from top to bottom on both sides of the main frame 100, the operation opening A is arranged on the maintenance floor H, and the movable opening B is arranged on the operation floor P, so that the staff can control the action of the worm 201c through the long rod tool at the operation opening A of the maintenance floor H when the motor fails, and the maintenance floor H and the operation floor P both meet the protection requirements.

[0037] Preferably, the driving assembly 200 comprises a power piece 201 arranged at the top of the main frame 100, a telescopic piece 202 detachably connected with the power piece 201, and a locking piece 203 fixedly installed on the telescopic piece 202, and the telescopic piece 202 slides on the guide rail 101, and the detachable connection with the power piece 201 refers to the connection between the endless chain 201f-1 in the power piece 201 and the end of the piston 202c, and the telescopic piece 202 as a whole slides on the guide rail 101.

[0038] Preferably, the charging tank 300 is provided with a material taking opening G matched with the telescopic piece 202 at the center, and a charging tank cover 301 arranged at the material taking opening G and capable of being taken out, and the material taking opening G is higher than the surface of the charging tank 300.

[0039] Preferably, the charging tank 300 is arranged below the operation floor P, and the telescopic piece 202 can pass through the movable opening B on the operation floor P to reach the material taking opening G on the charging tank 300.

[0040] In use, when the motor fails, the staff first releases the limiting of the driving assembly 200, and then controls the opening and closing of the charging tank cover 301 by driving the worm 201c, and after the charging tank cover 301 is clamped, the charging is carried out through the first bifurcated pipe 202b-1, and after the charging is completed, the charging tank cover 301 is closed, and then the worm 201c is controlled to restore the parts to the original position, and the motor is repaired.

[0041] Embodiment 2

[0042] Reference Figures 2 to 9 This is the second embodiment of the application, which is based on the previous embodiment.

[0043] Specifically, the end of the main frame 100 is also provided with a feeding pipe 102 extending from top to bottom, the other end of the feeding pipe 102 extends to the buffer pipe 103 in the direction of the telescopic part 202, the lower side of the guide rail 101 is also provided with a shock absorber 104, and each side of the guide rail 101 at two different heights is provided with a pair of limiting piles 105. The buffer pipe 103 is arranged to buffer the impact force of the spent fuel ball falling, so that the spent fuel ball slows down and enters the loading tank 300. The two pairs of limiting piles 105 are arranged at high and low positions respectively. In the initial state, the telescopic part 202 is in a locked state with the high-position limiting pile 105, and after the telescopic part 202 contacts the shock absorber 104, the power part 201 stops working, and the telescopic part 202 is in a locked state with the low-position limiting pile 105. The connection between the feeding pipe 102 and the buffer pipe 10 is provided with a copper sleeve and a sealing ring for lubrication and sealing.

[0044] Preferably, the power part 201 includes a motor 201a fixedly installed on the main frame 100, a worm 201c controlled by a shaft coupling 201b and the motor 201a, and a worm gear 201d cooperating with the worm 201c. The worm gear 201d is further provided with a sprocket 201f coaxially rotating through a transmission shaft 201e. One end of a ring chain 201f-1 on the sprocket 201f is hung downward. The end of the worm 201c is provided with an operating head 201c-1 cooperating with a square rod controlled by the worker. The worm 201c and the worm gear 201d have a self-locking function. The sprocket 201f has ring chains on both sides to ensure that the ring chain 201f-1 does not come off.

[0045] Preferably, the telescopic part 202 includes a mounting bracket 202a slidingly cooperating with the guide rail 101. The mounting bracket 202a is provided with an outer sleeve 202b extending into the inside of the loading tank 300. The outer sleeve 202b is provided with a first bifurcated pipe 202b-1 on one side and cooperates with the buffer pipe 103. The same side of the first bifurcated pipe 202b-1 is provided with a second bifurcated pipe 202b-2. The second bifurcated pipe 202b-2 is provided with a screw cap 202b-3. The surface of the outer sleeve 202b is fixedly installed with a movable sleeve 202b-4. The first bifurcated pipe 202b-1 serves as the entrance of the spent fuel ball, and the second bifurcated pipe 202b-2 is used to open the ball when the downstream pipe is blocked.

[0046] Preferably, the telescopic part 202 further includes a piston 202c arranged in the outer sleeve 202b. The piston 202c is fixedly connected with the ring chain 201f-1 at the top. The other end of the piston 202c is fixedly connected with a claw 202d through a connecting rod L. The claw 202d is self-locked with the loading tank cover 301.

[0047] Preferably, the telescopic member 202 further comprises a shield pipe 202e and an auxiliary rod 202e-1 fixedly installed on the shield pipe 202e, one end of the auxiliary rod 202e-1 is fixedly connected with the shield pipe 202e, and the other end extends to the active sleeve 202b-4 and is in sliding fit with the active sleeve 202b-4.

[0048] Preferably, the locking member 203 comprises a fixed seat 203a fixedly installed on the mounting frame 202a, a cylinder 203b fixedly installed on the fixed seat 203a, a piston rod of the cylinder 203b connected with a locking plate 203d through a pin shaft 203c, a screw rod support 203e provided at a tail of the cylinder 203b, a screw rod 203e-1 installed on the screw rod support 203e, and an unlocking connecting rod 203e-2 connecting the piston rod at the tail of the cylinder 203b with the screw rod 203e-1, the unlocking connecting rod 203e-2 having a long notch, the piston rod of the cylinder 203b being freely movable, the cylinder 203b being a double-acting double-rod cylinder, and the locking plate 203d being in sliding fit on a sliding groove of the fixed seat 203a, when the cylinder 203b fails, the screw rod 203e-1 can be twisted to drive the piston rod of the cylinder 203b to act.

[0049] Preferably, an end of the locking plate 203d is provided with a clamping groove 203d-1 in clamping fit with the limiting stake 105, the locking member 203 is provided with three sets, two of which are fixedly installed on two sides of the mounting frame 202a to position the lifting position, and the other set of the locking member 203d is provided on the side where the piston 202c is connected with the endless chain 201f-1 to limit and fix the piston 202c.

[0050] In use, when the motor fails, first the staff twists the screw 203e-1 to drive the piston rod of the air cylinder 203b to act, so that the locking plate 203d slides on the sliding groove of the fixed seat 203a, and then the locking state between the locking plate 203d and the high-position limiting pile 105 is released. The long rod tool drives the worm 201c to rotate, and then drives the worm wheel 201d to rotate, so that the sprocket 201f starts to drive the endless chain 201f-1 to descend. The mounting bracket 202a slides on the guide rail 101. When the mounting bracket 202a contacts the shock absorber 104, it stops rotating. When the shielding pipeline 202e is in place and is supported, the auxiliary rod 202e-1 can slide on the movable sleeve 202b-4, mainly to play a role in preventing leakage and enhancing sealing. At this time, the locking plate 203d also just falls to the low-position limiting pile 105. Twist the screw 203e-1 to make the locking plate 203d reach the limiting state with the limiting pile 105. Because the locking plate 203d used to limit and fix the piston 202c has not been released before, when the mounting bracket 202a descends, the piston 202c is still at the end of the outer sleeve 202b. After the locking plate 203d is fixed with the low-position limiting pile 105, the locking of the piston 202c and the locking plate 203d is released. At this time, continue to drive the worm 201c until the pawl 202d contacts the charging tank cover 301 to achieve self-locking and clamp the charging tank cover 301. At this time, reverse the worm 201c to make the endless chain 201f-1 rise and open the charging tank cover 301. Continuously drive the endless chain 201f-1 to rise until the charging tank cover 301 is higher than the inlet of the first bifurcated pipe 202b-1. At this time, the spent fuel balls can be loaded from the feed pipe 102.

[0051] After the loading is completed, the worm 201c drives the endless chain 201f-1 to descend to make the charging tank cover 301 close the charging tank 300 again. At this time, the pawl 202d is separated from the charging tank cover 301. The endless chain 201f-1 rises until the piston 202c reaches the position locked with the locking plate 203d. Twist the screw 203e-1 to make the locking plate 203d reach the limiting state with the piston 202c. The fixing state of the two locking plates 203d and the low-position limiting pile 105 is released. The endless chain 201f-1 continues to rise until the locking plate 203d reaches the high-position limiting pile 105 and is locked at this time. Repeat the above steps to achieve multiple loadings.

[0052] It should be noted that the opening and closing of the pawl 202d is controlled by a pneumatic method, and the operation of opening and closing the pawl 202d is completed by the gas claw 202d. The pawl 202d cylinder is de-pressurized and deflated when the pawl 202d needs to be opened, and high-pressure gas is filled when the pawl 202d needs to be closed, which can ensure that the pawl has the inherent safety feature of opening after power failure (gas loss) after grasping the tank cover.

[0053] Embodiment 3

[0054] With reference to Figure 10 For the third embodiment of the present application, the embodiment is based on the first two embodiments.

[0055] Specifically, the guard 204 includes a fall-preventing post 204a arranged on both sides of the guide rail 101, and a plurality of fall-preventing grooves 204a-1 are arranged on the fall-preventing post 204a.

[0056] Preferably, the locking member 203 further includes a protection box 204b fixedly connected with the mounting frame 202a, the protection box 204b is provided with a ejection port 204b-1 on the side facing the fall-preventing post 204a, the protection box 204b further includes a sensing post 204b-3 arranged in the box body and fixedly connected with the inner wall of the box body through a first spring 204b-2, the end of the sensing post 204b-3 is provided with a clamping plate 204b-4, the clamping plate 204b-4 is provided with a moving groove 204b-5, the protection box 204b further includes a spring post 204b-6 sliding in the moving groove 204b-5, one end of the spring post 204b-6 is fixedly connected with the inner wall of the protection box 204b through a compression spring 204b-7, and the other end is embeddedly matched with the fall-preventing groove 204a-1.

[0057] In use, since there may be self-locking failure between the worm 201c and the worm gear 201d, the working charging device stalls, at this time, the sensing post 204b-3 in the protection box 204b is affected by the inertia of rapid falling, and moves upward, and then the clamping plate 204b-4 moves upward, and since the compression spring 204b-7 on the other end of the spring post 204b-6 is always in a compressed state, when the clamping plate 204b-4 moves to the horizontal position of the spring post 204b-6, the ejection port 204b-1 and the moving groove 204b-5, the compression spring 204b-7 rebounds to the original position, so that the spring post 204b-6 is ejected and embedded in the fall-preventing groove 204a-1, at this time, the mounting frame 202a can be prevented from continuing to fall, and then the staff can carry out maintenance, and during the maintenance process, the components are restored to the initial state.

[0058] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limiting, and although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present application, and they should be covered in the scope of the claims of the present application.

Claims

1. A spent fuel loading device with emergency response capabilities, characterized in that: include, The main frame (100) is fixedly installed between the maintenance room floor slab (H) and the operating room floor slab (P) to serve as the foundation of the mechanism. It includes guide rails (101) set on the surface of the main frame (100). The guide rails (101) extend from top to bottom on both sides of the main frame (100). The maintenance room floor slab (H) is provided with an operating port (A), and the operating room floor slab (P) is provided with an access port (B). The drive assembly (200) includes a power component (201) disposed on the top of the main frame (100), a telescopic component (202) detachably connected to the power component (201), a locking component (203) fixedly installed on the telescopic component (202), and a protective component (204). The telescopic component (202) slides on the guide rail (101), and the protective component (204) is used for emergency braking in the event of stall. A material tank (300) has a material inlet (G) at its center that matches the diameter of the telescopic member (202), and a material tank cover (301) located at the material inlet (G) and removable. The material inlet (G) is higher than the surface of the material tank (300). The loading tank (300) is located below the operating room floor (P), and the telescopic component (202) can pass through the movable opening (B) on the operating room floor (P) to reach the material dispensing port (G) on the loading tank (300). The end of the main frame (100) is also provided with a feed pipe (102) extending from top to bottom. The other end of the feed pipe (102) extends to the direction of the telescopic member (202) and is provided with a buffer pipe (103). A shock absorber (104) is also provided below the guide rail (101). A pair of limit posts (105) are provided on each side of the guide rail (101) at two different heights.

2. The spent fuel charging device with emergency function as described in claim 1, characterized in that: The power component (201) includes a motor (201a) fixedly mounted on the main frame (100), a worm gear (201c) controlled by the motor (201a) via a coupling (201b), and a worm wheel (201d) cooperating with the worm gear (201c). A sprocket (201f) coaxially rotating via a transmission shaft (201e) is also provided on one side of the worm wheel (201d). One end of the ring chain (201f-1) on the sprocket (201f) hangs downward. An operating head (201c-1) cooperating with a square rod operated by the operator is provided at the end of the worm gear (201c).

3. The spent fuel charging device with emergency function as described in claim 2, characterized in that: The telescopic component (202) includes a mounting bracket (202a) that slides with the guide rail (101). The mounting bracket (202a) is provided with an outer sleeve (202b) that extends into the filling tank (300). A first branch pipe (202b-1) is provided on one side of the outer sleeve (202b) and is connected to the buffer pipe (103). A second branch pipe (202b-2) is provided on the same side of the first branch pipe (202b-1). A screw cap (202b-3) is provided on the second branch pipe (202b-2). A movable sleeve (202b-4) is fixedly installed on the surface of the outer sleeve (202b).

4. The spent fuel charging device with emergency function as described in claim 3, characterized in that: The telescopic component (202) also includes a piston (202c) disposed inside the outer sleeve (202b). The top of the piston (202c) is fixedly connected to the ring chain (201f-1), and the other end of the piston (202c) is fixedly connected to the claw (202d) through the connecting rod (L). The claw (202d) is self-lockingly engaged with the filling tank cover (301).

5. The spent fuel charging device with emergency function as described in claim 4, characterized in that: The telescopic component (202) also includes an auxiliary rod (202e-1) disposed on the shielded pipe (202e) and fixedly installed on the shielded pipe (202e). One end of the auxiliary rod (202e-1) is fixedly connected to the shielded pipe (202e), and the other end extends toward the movable sleeve (202b-4) and slides in cooperation with the movable sleeve (202b-4).

6. The spent fuel charging device with emergency function as described in claim 5, characterized in that: The locking component (203) includes a fixed seat (203a) fixedly installed on the mounting bracket (202a). A cylinder (203b) is fixedly installed on the fixed seat (203a). The piston rod of the cylinder (203b) is connected to the locking plate (203d) through a pin (203c). A screw bracket (203e) is provided at the tail of the cylinder (203b). A screw (203e-1) is installed on the screw bracket (203e). The piston rod at the end of the cylinder (203b) is connected to the screw (203e-1) through an unlocking link (203e-2). The unlocking link (203e-2) has a long slot, allowing the piston rod of the cylinder (203b) to move freely.

7. The spent fuel charging device with emergency function as described in claim 6, characterized in that: The locking plate (203d) has a slot (203d-1) at its end that engages with the limiting post (105). There are three sets of locking components (203), two of which are fixedly installed on both sides of the mounting bracket (202a) to position the lifting position. The other set of locking components (203) is located on the side where the piston (202c) is connected to the ring chain (201f-1) to limit and fix the piston (202c).

8. The spent fuel charging device with emergency function as described in claim 7, characterized in that: The protective component (204) includes anti-fall piles (204a) disposed on both sides of the guide rail (101), and a plurality of anti-fall grooves (204a-1) are provided on the anti-fall piles (204a).

9. The spent fuel charging device with emergency function as described in claim 8, characterized in that: The locking component (203) further includes a protective box (204b) fixedly connected to the mounting bracket (202a). The protective box (204b) has a spring outlet (204b-1) on the side facing the fall arrestor (204a). The protective box (204b) also includes a sensor (204b-3) fixedly connected to the inner wall of the box via a first spring (204b-2). The end of the sensor (204b-3) is provided with a locking plate (204b-4). The locking plate (204b-4) is provided with a moving groove (204b-5). The interior of the protective box (204b) also includes a spring (204b-6) that slides in the moving groove (204b-5). One end of the spring (204b-6) is fixedly connected to the inner wall of the protective box (204b) via a compression spring (204b-7), and the other end is embedded in the fall arrestor groove (204a-1).

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