CN112103005B

CN112103005B - Communication cable

Info

Publication number: CN112103005B
Application number: CN202010989925.9A
Authority: CN
Inventors: 杨虹
Original assignee: Anhui Xinxin Electric Co ltd
Current assignee: Anhui Xinxin Electric Co.,Ltd.
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2021-08-10
Anticipated expiration: 2040-09-18
Also published as: CN112103005A

Abstract

The invention discloses a communication cable, which comprises a machine body, wherein a moving cavity is arranged in the machine body, a cable which penetrates through the machine body from left to right and is connected with the machine body in a sliding manner is arranged in the machine body, a moving mechanism is arranged in the moving cavity, a cut-off cavity is arranged on the right side of the right inner wall of the moving cavity, a cut-off protection mechanism is arranged in the cut-off cavity, two limiting cavities with right openings are arranged on the right end surface of the machine body, a cleaning mechanism is arranged in the limiting cavities, the cut-off protection mechanism comprises a cut-off block which is positioned in the cut-off cavity in a sliding connection manner, and a cut-off blade is fixedly connected to the lower end of the cut-off block. And the cable is insulated and protected through mechanical transmission, so that the workload of workers is reduced.

Description

Communication cable

Technical Field

The invention relates to the field of communication cables, in particular to a communication cable.

Background

In daily life, cables are often used for data transmission, the surfaces of the cables are dusty due to long-term uncleaning, and the cables can spontaneously combust due to high temperature and load in hot weather, so that the cables are cleaned and prevented manually at present.

At the present stage, the cable surface cleaning and the cable fire prevention are both manually operated, so that the phenomena that the cable surface cleaning and the cable fire prevention are complex are avoided, a large amount of physical force of workers is consumed, and the workload of the workers is increased.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a communication cable, which overcomes the problems that the surface of the cable cannot be automatically cleaned and the cable cannot be automatically prevented from being ignited, and the like, and increases the functions of automatically cleaning the surface of the cable and automatically preventing the cable from being ignited.

The invention relates to a communication cable, which comprises a machine body, wherein a moving cavity is arranged in the machine body, a cable which penetrates through the machine body left and right and is connected with the machine body in a sliding manner is arranged in the machine body, a moving mechanism is arranged in the moving cavity, a cutting cavity is arranged on the right side of the right inner wall of the moving cavity, a cutting protection mechanism is arranged in the cutting cavity, two limiting cavities with right openings are arranged on the right end face of the machine body, a cleaning mechanism is arranged in each limiting cavity, the cutting protection mechanism comprises a cutting block which is positioned in the cutting cavity in a sliding connection manner, the lower end of the cutting block is fixedly connected with a cutting blade, two cutting springs fixedly connected with the lower end of the cutting block are fixedly connected on the lower inner wall of the cutting cavity, two linkage pull ropes are fixedly connected on the lower end of the cutting block, a fixed block is fixedly connected on the lower inner wall of the cutting cavity, sliding cavities with openings facing away from the center of the machine body are arranged on the left and right end faces of the machine body, the heat conduction block is fixedly connected with the communication position of the outer space on the inner wall of the sliding cavity, the expansion block and the sliding block are slidably connected in the sliding cavity, the sliding cavity is close to the inner wall of the center of the machine body and is close to the sliding spring fixedly connected on the end surface of the center of the machine body, the sliding block is close to the sliding stay rope fixedly connected on the end surface of the center of the machine body, an operation cavity is arranged in the machine body, the operation cavity is slidably connected with an operation block, the upper end of the operation block is fixedly connected with two other ends of the sliding stay rope, the lower inner wall of the operation cavity is fixedly connected with the operation spring fixedly connected with the lower end of the operation block, and the lower end of the operation block is fixedly connected with a limiting stay rope and two protecting stay ropes.

Furthermore, the moving mechanism comprises a power motor fixedly connected with the rear inner wall of the moving cavity, the front and rear inner walls of the moving cavity are rotatably connected with two moving shafts, the moving shafts are fixedly connected with moving wheels, the moving wheels are in friction connection with the cables, the moving shafts are fixedly connected with a centrifugal wheel and a driven gear at the upper side, sixteen centrifugal cavities with openings facing away from the center direction of the moving shafts are arranged in the centrifugal wheel, centrifugal blocks are slidably connected in the centrifugal cavities, centrifugal springs fixedly connected with the centrifugal blocks and close to the central end faces of the moving shafts are fixedly connected with the central inner wall of the moving cavity and close to the central end faces of the moving shafts, a pushing cavity with a downward opening is arranged on the upper inner wall of the moving cavity, pushing blocks are slidably connected in the pushing cavity, and pushing springs fixedly connected with the upper ends of the pushing blocks are fixedly connected with the upper inner wall of the pushing cavity, the device comprises a driving block, a driving shaft, a linkage shaft, a belt pulley, a linkage gear, a driven gear, a driving wheel, a driving block, an insulation cavity and a driving wheel, wherein the driving block is fixedly connected with two driving pull ropes at the upper end of the driving block and at the lower side of the driving block, the driving wheel is fixedly connected with the driving wheel on the moving cavity rear inner wall, the linkage shaft is fixedly connected with the belt pulley and the linkage gear on the linkage shaft, the linkage gear is meshed with the driven gear, the belt pulley is connected with the driving wheel through the linkage belt in a power fit mode, the insulation cavity is arranged on the left end face and the right end face of the insulation cavity, the opening faces are far away from the direction of the insulation cavity, and the insulation block is fixedly connected to the insulation cavity inner wall.

Furthermore, the cleaning mechanism comprises two limiting cavities, wherein limiting blocks are connected in the two limiting cavities in a sliding manner, a limiting spring fixedly connected with the left inner wall of each limiting cavity is fixedly connected with the left inner wall of each limiting cavity, the limiting blocks are close to the cleaning cavities with openings facing the direction of the cable center and arranged on the end faces of the cable center, cleaning blocks are connected in the cleaning cavities in a sliding manner, the cleaning cavities are far away from the inner wall of the cable center and far away from the end faces of the cable center through the cleaning springs and fixedly connected with each other, cleaning grooves with openings facing the direction of the cable center are arranged in the cleaning blocks, the front ends of the power motors are dynamically connected with power shafts, sliding gears and keys are connected with power gears in a sliding manner, the rear ends of the sliding gears and the front ends of the power gears are provided with magnet blocks capable of absorbing each other, and the rear end faces of the power gears are provided with limiting grooves with, sliding connection has the restriction pole in the restriction groove, be equipped with the forward restriction chamber of opening on the removal intracavity rear wall, the restriction pole is in restriction intracavity sliding connection, on the restriction intracavity rear wall fixedly connected with restriction pole rear end fixed connection's restriction spring, restriction pole rear end fixed connection has the other end of restriction stay cord, spacing chamber is kept away from be equipped with the opening orientation on the cable inner wall and be close to the protection chamber of cable center direction, sliding connection has the protection piece in the protection chamber, the protection chamber is kept away from fixedly connected with on the cable center inner wall with the protection piece is kept away from fixed connection's protection spring on the cable center terminal surface, the protection piece is kept away from fixedly connected with on the cable center terminal surface the other end of protection stay cord.

Furthermore, the elasticity of the operating spring is smaller than the sum of the elasticity of the two sliding springs, the elasticity of the operating spring is larger than the elasticity of the single sliding spring, the elasticity of the protecting spring and the elasticity of the limiting spring are far smaller than the elasticity of the operating spring, the elasticity of the pushing spring is larger than the sum of the elasticity of the two limiting springs, and the magnetic force between the two magnet blocks is larger than the sum of the elasticity of the two cutting springs.

The invention has the beneficial effects that: the cable surface cleaning device is simple in structure and convenient and fast to operate, when the cable surface needs to be cleaned, the cable can be automatically cleaned through mechanical transmission, when the cable is on fire, the cable can be cut off and protected in a power-off mode through the mechanical transmission, the cable is protected in an insulation mode through the mechanical transmission, and therefore the workload of workers is reduced.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an embodiment of the present invention;

FIG. 2 is a schematic structural diagram at A-A in FIG. 1 according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram at B-B in FIG. 1 according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram at C-C in FIG. 1 according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram at D-D in FIG. 2 according to an embodiment of the present invention.

Detailed Description

The invention will now be described in detail with reference to fig. 1-5, wherein for ease of description the orientations described hereinafter are now defined as follows: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

Combine 1-5 a communication cable, include organism 10, be equipped with in the organism 10 and remove chamber 11, be equipped with about in the organism 10 run through the organism 10 and with organism 10 sliding connection's cable 12, it is equipped with moving mechanism 66 to remove intracavity 11, it is equipped with and cuts chamber 45 to remove chamber 11 right inner wall right side, it is equipped with and cuts protection mechanism 67 to cut the intracavity 45, be equipped with two opening spacing chambers 52 to the right on the right terminal surface of organism 10, be equipped with clearance mechanism 65 in the spacing chamber 52, it includes and is located to cut the piece 46 of sliding connection in chamber 45 to cut protection mechanism 67, cut piece 46 lower extreme fixedly connected with and cut blade 47, cut on the inner wall under the chamber 45 fixedly connected with cut two spring 48 of cutting piece 46 lower extreme fixed connection, cut two linkage stay cords 32 of 46 lower extreme fixedly connected with of piece, a fixed block 49 is fixedly connected to the lower inner wall of the truncation cavity 45, sliding cavities 39 with openings facing away from the center direction of the machine body 10 are respectively arranged on the left end face and the right end face of the machine body 10, a heat conduction block 40 is fixedly connected to the communication part of the inner wall of the sliding cavity 39 and the external space, an expansion block 41 and a sliding block 42 are slidably connected in the sliding cavity 39, a sliding spring 44 is fixedly connected to the position, close to the center end face of the machine body 10, of the sliding cavity 39, close to the center inner wall of the machine body 10, of the sliding block 42, a sliding pull rope 43 is fixedly connected to the position, close to the center end face of the machine body 10, an operation cavity 62 is arranged in the machine body 10, an operation block 63 is slidably connected in the operation cavity 62, the other ends of the two sliding pull ropes 43 are fixedly connected to the upper end of the operation block 63, and an operation spring 64 fixedly connected to the lower ends of the operation block 63 is fixedly connected to the lower inner wall of the operation cavity 62, the lower end of the operating block 63 is fixedly connected with a limiting pull rope 38 and two protecting pull ropes 61.

Advantageously, the moving mechanism 66 includes a power motor 28 fixedly connected to the rear inner wall of the moving chamber 11, two moving shafts 13 are rotatably connected to the front and rear inner walls of the moving chamber 11, moving wheels 14 are fixedly connected to the moving shafts 13, the moving wheels 14 are frictionally connected to the cables 12, centrifugal wheels 15 and driven gears 16 are fixedly connected to the upper moving shafts 13, sixteen centrifugal cavities 17 with openings facing away from the center of the moving shafts 13 are disposed in the centrifugal wheels 15, centrifugal blocks 18 are slidably connected to the centrifugal cavities 17, centrifugal springs 19 fixedly connected to the centrifugal blocks 18 near the center end faces of the moving shafts 13 are fixedly connected to the centrifugal cavities 17 near the center of the moving shafts 13, a pushing cavity 20 with a downward opening is disposed on the upper inner wall of the moving chamber 11, and a pushing block 21 is slidably connected to the pushing cavity 20, the utility model discloses a drive device, including promote the chamber 20 on the inner wall fixedly connected with promote piece 21 upper end fixed connection's promotion spring 22, promote two promotion stay cords 23 of piece 21 upper end fixed connection, the downside remove fixedly connected with drive wheel 24 on the axle 13, it is connected with universal driving shaft 25 to rotate on the inner wall behind the chamber 11 to remove, fixedly connected with belt pulley 27, linkage gear 26 on the universal driving shaft 25, linkage gear 26 with driven gear 16 meshes mutually, belt pulley 27 with drive wheel 24 is connected by linkage belt 70 power fit, all be equipped with the opening orientation on the terminal surface about cutting the piece 46 and keep away from cut off the insulating chamber 50 of piece 46 direction, fixedly connected with insulating block 51 on the insulating chamber 50 inner wall.

Beneficially, the cleaning mechanism 65 includes two limiting cavities 52, each of the two limiting cavities 52 is slidably connected with a limiting block 53, a limiting spring 54 fixedly connected with the left end of the limiting block 53 is fixedly connected to the left inner wall of the limiting cavity 52, a cleaning cavity 55 with an opening facing the central direction of the cable 12 is provided on the end surface of the limiting block 53 close to the center of the cable 12, a cleaning block 56 is slidably connected to the cleaning cavity 55, a cleaning groove 58 with an opening facing the central direction of the cable 12 is provided in the cleaning block 56, the inner wall of the cleaning cavity 55 far away from the center of the cable 12 is fixedly connected to the end surface of the cleaning block 56 far away from the center of the cable 12 by a cleaning spring 57, the front end of the power motor 28 is dynamically connected with a power shaft 29, a sliding gear 31 and a key-connected power gear 30 are slidably connected to the power shaft 29, a magnet block 33 capable of attracting each of being provided at the rear end of the sliding gear 31 and the front end of the power gear 30, a limiting groove 34 with a backward opening is arranged on the rear end surface of the power gear 30, a limiting rod 35 is connected in the limiting groove 34 in a sliding way, a limiting cavity 36 with a forward opening is arranged on the rear inner wall of the moving cavity 11, the limiting rod 35 is connected in a sliding way in the limiting cavity 36, a limiting spring 37 fixedly connected with the rear end of the limiting rod 35 is fixedly connected with the rear inner wall of the limiting cavity 36, the rear end of the limiting rod 35 is fixedly connected with the other end of the limiting pull rope 38, a protection cavity 68 with an opening facing the direction close to the center of the cable 12 is arranged on the inner wall of the limiting cavity 52 far away from the cable 12, a protection block 59 is slidably connected in the protection cavity 68, a protection spring 60 fixedly connected with the protection block 59 on the end face far away from the center of the cable 12 is fixedly connected on the inner wall of the protection cavity 68 far away from the center of the cable 12, the other end of the protection pull rope 61 is fixedly connected to the end face, far away from the center of the cable 12, of the protection block 59.

Advantageously, the elastic force of the operating spring 64 is smaller than the sum of the elastic forces of the two sliding springs 44, the elastic force of the operating spring 64 is larger than the elastic force of the single sliding spring 44, the elastic force of the protection spring 60 and the limiting spring 37 is much smaller than the elastic force of the operating spring 64, the elastic force of the pushing spring 22 is larger than the sum of the elastic forces of the two limiting springs 54, and the magnetic force between the two magnet blocks 33 is larger than the sum of the elastic forces of the two intercepting springs 48.

In the initial state, the operating spring 64 is in a stretched state, the restricting spring 37 is in a compressed state, the protecting spring 60 is in a compressed state, the restricting spring 54 is in a compressed state, and the cleaning spring 57 is in a compressed state.

When the device works, the power motor 28 is started, the power motor 28 works to drive the power shaft 29 to rotate, the power shaft 29 rotates to drive the power gear 30 to rotate, the power gear 30 rotates to drive the linkage shaft 25, the linkage gear 26 and the belt pulley 27 to rotate, the linkage gear 26 rotates to drive the driven gear 16, the upper moving shaft 13, the upper moving wheel 14 and the centrifugal wheel 15 to rotate, the belt pulley 27 rotates to drive the linkage belt 70 and the lower driving wheel 24 to rotate to drive the lower moving shaft 13 and the lower moving wheel 14 to rotate, so that the device moves left and right on the cable 12, the centrifugal wheel 15 rotates to enable the centrifugal block 18 to move away from the center direction of the moving shaft 13, the centrifugal spring 19 is stretched, the pushing block 21 is pushed upwards, the pushing spring 22 is compressed, the two pushing pull ropes 23 are released, the limiting block 53 moves rightwards, and the limiting spring 54 resets, the two cleaning blocks 56 move towards the direction close to the cable 12, the cleaning spring 57 resets, the inner wall of the cleaning groove 58 is in contact with the outer surface of the cable 12, at the moment, the cleaning groove 58 moves left and right, and the cleaning effect is achieved, when a fire happens at a certain position of the cable 12, the heat conducting block 40 transfers heat to the expansion block 41, so that the expansion block 41 expands, the sliding block 42 is moved towards the direction close to the center of the machine body 10, the sliding spring 44 is compressed, the sliding pull rope 43 is loosened, the operation block 63 moves downwards, the operation spring 64 resets, the limiting pull rope 38 and the two protecting pull ropes 61 are loosened, the limiting pull rope 38 is loosened, the limiting spring 37 resets, the limiting rod 35 and the power gear 30 are pushed forwards, the power gear 30 is disengaged from the linkage gear 26, and the two magnets 33 are in contact and attracted to each other, the linkage gear 26, the belt pulley 27 and the linkage shaft 25 are stopped to rotate, the driven gear 16, the transmission wheel 24, the two moving shafts 13, the two moving wheels 14 and the centrifugal wheel 15 are stopped to rotate, the centrifugal wheel 15 is stopped to rotate, the centrifugal block 18 and the centrifugal spring 19 are reset, the pushing block 21 is moved downwards to an initial position, the pushing spring 22 is reset, the two pushing pull ropes 23 are pulled, the limiting block 53 and the cleaning block 56 are moved to the initial position, the limiting spring 54 and the cleaning spring 57 are compressed, the two protecting pull ropes 61 are loosened to reset the protecting spring 60, the protecting block 59 is moved towards the direction close to the center of the cable 12, the limiting block 53 and the cleaning block 56 are not contacted with the outside, the protecting effect is achieved, after the two magnet blocks 33 are mutually attracted, the power gear 30 rotates to drive the sliding gear 31 to rotate, the sliding gear 31 rotates to wind the two linkage pull ropes 32, the linkage pull rope 32 is pulled to compress the cut-off spring 48, the cut-off block 46 and the cut-off blade 47 are pulled downwards to cut off the cable 12, when the cut-off blade 47 is in contact with the fixed block 49 and the power motor 28 stops working, the sections of the cut-off cable 12 are respectively positioned in the two insulation cavities 50 at the moment, so that the power-off and insulation effects are achieved, when maintenance is needed after fire extinguishment, the expansion block 41 and the sliding block 42 are reset, the sliding pull rope 43 is pulled and the sliding spring 44 is reset, the operation block 63 is moved upwards to the initial position, the operation spring 64 is stretched, the limiting pull rope 38 and the two protecting pull ropes 61 are pulled, the limiting rod 35, the power gear 30 and the protecting block 59 are moved to the initial position, the sliding gear 31 can rotate to the initial position after being not limited, the linkage pull rope 32 is loosened, the cut-off spring 48 is reset, so that the cutting block 46 and the cutting blade 47 move to the initial positions, thereby achieving the resetting effect.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.

Claims

1. A communication cable, comprising a body, characterized in that: the machine body is internally provided with a moving cavity, the machine body is internally provided with a cable which runs through the machine body left and right and is connected with the machine body in a sliding way, the moving cavity is internally provided with a moving mechanism, the right side of the right inner wall of the moving cavity is provided with a cutting cavity, the cutting cavity is internally provided with a cutting protection mechanism, the right end face of the machine body is provided with two limiting cavities with right openings, the limiting cavities are internally provided with a cleaning mechanism, the cutting protection mechanism comprises a cutting block which is positioned in the cutting cavity and is connected with the cutting cavity in a sliding way, the lower end of the cutting block is fixedly connected with a cutting blade, the lower inner wall of the cutting cavity is fixedly connected with two cutting springs which are fixedly connected with the lower end of the cutting block, the lower end of the cutting block is fixedly connected with two linkage pull ropes, the lower inner wall of the cutting cavity is fixedly connected with a fixed block, the left end face and the right end face of the machine body are both provided with sliding cavities with openings which are far away from the center direction of the machine body, a heat conducting block is fixedly connected to the inner wall of the sliding cavity and communicated with the external space, an expansion block and a sliding block are connected in the sliding cavity in a sliding manner, a sliding spring is fixedly connected to the inner wall of the center of the machine body, which is close to the center end face of the machine body, of the sliding cavity, a sliding spring is fixedly connected to the inner wall of the center of the machine body, which is close to the center end face of the machine body, of the sliding block, a sliding pull rope is fixedly connected to the inner end face of the sliding block, an operation cavity is arranged in the machine body, an operation block is connected in the operation cavity in a sliding manner, the upper end of the operation block is fixedly connected with the other ends of the two sliding pull ropes, an operation spring fixedly connected to the lower end of the operation block is fixedly connected to the lower inner wall of the operation cavity, and the lower end of the operation block is fixedly connected with a limiting pull rope and two protecting pull ropes;

the moving mechanism comprises a power motor fixedly connected on the inner wall behind the moving cavity, two moving shafts are rotatably connected on the inner wall in front of and behind the moving cavity, moving wheels are fixedly connected on the moving shafts, the moving wheels are in friction connection with the cables, centrifugal wheels and driven gears are fixedly connected on the moving shafts at the upper side, sixteen centrifugal cavities with openings facing away from the center direction of the moving shafts are arranged in the centrifugal wheels, centrifugal blocks are slidably connected in the centrifugal cavities, centrifugal springs fixedly connected with the centrifugal blocks close to the central end faces of the moving shafts are fixedly connected on the inner wall of the moving shaft close to the central end faces of the moving shafts close to the central ends of the moving shafts, pushing cavities with downward openings are arranged on the inner wall of the moving cavities, pushing blocks are slidably connected in the pushing cavities, and pushing springs fixedly connected with the upper ends of the pushing blocks on the inner wall of the pushing cavities, the upper end of the pushing block is fixedly connected with two pushing pull ropes, the moving shaft at the lower side is fixedly connected with a driving wheel, the rear inner wall of the moving cavity is rotatably connected with a linkage shaft, the linkage shaft is fixedly connected with a belt pulley and a linkage gear, the linkage gear is meshed with the driven gear, the belt pulley and the driving wheel are in power fit connection through a linkage belt, insulating cavities with openings facing away from the direction of the cutting block are arranged on the left end surface and the right end surface of the cutting block, and insulating blocks are fixedly connected to the inner wall of the insulating cavities;

the cleaning mechanism comprises two limiting cavities, limiting blocks are respectively and slidably connected in the two limiting cavities, a limiting spring fixedly connected with the left end of each limiting cavity is fixedly connected to the left inner wall of each limiting cavity, the limiting blocks are close to the cleaning cavities with openings facing the direction of the cable center and arranged on the end faces of the cable center, cleaning blocks are slidably connected in the cleaning cavities, the cleaning cavities are far away from the inner walls of the cable center and the cleaning blocks and are fixedly connected by the cleaning springs, cleaning grooves with openings facing the direction of the cable center are arranged in the cleaning blocks, the front end of the power motor is dynamically connected with a power shaft, a sliding gear is slidably connected to the power shaft and is connected with a power gear, the rear end of the sliding gear and the front end of the power gear are respectively provided with a magnet block capable of absorbing each other, and a limiting groove with a backward opening is arranged on the rear end face of the power gear, a limiting rod is connected in the limiting groove in a sliding mode, a limiting cavity with a forward opening is formed in the rear inner wall of the moving cavity, the limiting rod is connected in the limiting cavity in a sliding mode, a limiting spring fixedly connected with the rear end of the limiting rod is fixedly connected to the rear inner wall of the limiting cavity, the rear end of the limiting rod is fixedly connected with the other end of the limiting pull rope, a protecting cavity with an opening facing the direction close to the center of the cable is formed in the position, away from the cable inner wall, of the limiting cavity, a protecting block is connected in the protecting cavity in a sliding mode, the position, away from the cable center inner wall, of the protecting cavity is fixedly connected with a protecting spring fixedly connected with the position, away from the cable center end face, of the protecting pull rope is fixedly connected to the position, away from the cable center end face, of the protecting block;

the elasticity of the operating spring is smaller than the sum of the elasticity of the two sliding springs, the elasticity of the operating spring is larger than the elasticity of the single sliding spring, the elasticity of the protection spring and the elasticity of the limiting spring are far smaller than the elasticity of the operating spring, the elasticity of the pushing spring is larger than the sum of the elasticity of the two limiting springs, and the magnetic force between the two magnet blocks is larger than the sum of the elasticity of the two cutting springs.