CN218747934U

CN218747934U - Coal mine transportation belt cutting and recycling device

Info

Publication number: CN218747934U
Application number: CN202223320181.5U
Authority: CN
Inventors: 唐晓伟; 李鹏博; 李金博
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-12-10
Filing date: 2022-12-10
Publication date: 2023-03-28
Anticipated expiration: 2032-12-10

Abstract

The utility model discloses a coal mine transportation belt cuts recovery unit, be the box-shaped base that the opening set up including the right side, box-shaped base's top fixedly connected with protecting tube is equipped with the belt that is used for coal mine transportation in the protecting tube, and the top of belt extends to the top of protecting tube, rotate between the front side inner wall of protecting tube and the rear side inner wall and install the conveying mechanism with belt matched with, conveying mechanism is used for carrying the belt. The utility model discloses a cut mechanism, elasticity and press solid mechanism and fixed cutter to cooperate, can press the mode that cuts admittedly to the belt automatically when removing first cutter, do not need personnel to part the exclusive operation, can effectually avoid because of not fixing the condition that directly cuts, and cooperate through weighing mechanism and audible-visual annunciator, automatic alarm reminds personnel to clear up when the belt that can be in the collection box is filled with, can effectually avoid influencing the efficiency of belt unloading because of the clearance untimely.

Description

Coal mine transportation belt cutting and recycling device

Technical Field

The utility model relates to a cutting recovery plant technical field especially relates to a coal mine transportation belt cuts recovery unit.

Background

The coal mine transportation belt is a necessary conveying part in coal mine transportation, is mainly used for transporting coal mines, is used for a long time, is easy to damage and needs to be replaced, in order to reduce the occupied space, the replaced belt can be cut and recovered through a belt cutting and recovering device, the cut belt occupies a small space and is convenient to place;

present colliery transportation belt cuts recovery unit, it is that the mechanism that cuts and press solid mechanism to be the exclusive operation use on it, need personnel to fix the back to the belt, then open and cut the mechanism and carry, its exclusive operation's mode, need set up fixed drive equipment or artifical hard fixed in addition alone, and easily because of personnel when not fixing the belt, touch the switch that cuts the mechanism because of the mistake, trigger and cut the mechanism and open the condition that cuts, there is the safety risk, and when the collection box was filled with, can not in time remind personnel, can not satisfy the user demand, synthesize the above-mentioned condition, therefore we have proposed a colliery transportation belt and cut recovery unit.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the defects existing in the prior art and providing a coal mine transportation belt cutting and recycling device.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a belt cutting and recycling device for coal mine transportation comprises a box-shaped base with an opening at the right side, a protective pipe is fixedly connected to the top of the box-shaped base, a belt for coal mine transportation is arranged in the protective pipe, the top of the belt extends to the upper side of the protective pipe, a conveying mechanism matched with the belt is rotatably arranged between the front inner wall and the rear inner wall of the protective pipe and used for conveying the belt, a driving motor fixedly connected with an output shaft and fixedly connected with the conveying mechanism is fixedly arranged at the front side of the protective pipe and used for driving the conveying mechanism to rotate, guide wheels are movably contacted with the two sides of the belt and used for guiding the belt, the guide wheels are rotatably arranged between the front inner wall and the rear inner wall of the protective pipe, a fixed cutting knife is fixedly connected to the right inner wall of the protective pipe, a cutting mechanism is arranged at the left side of the fixed cutting knife and matched with the belt, the left side of the cutting mechanism extends to the left side of the protective pipe and is fixedly connected with the left side of the protective pipe, an audible and visual alarm is arranged at the right side of the protective pipe and is used for electrically connected with an audible and visual alarm device for controlling the belt, and audible and visual alarm devices, and weighing the belt collected in the recovery box by a weighing mechanism.

Preferably, the conveying mechanism comprises two rubber conveying rollers rotatably mounted between the front inner wall and the rear inner wall of the protective pipe, the belt is movably contacted between the two rubber conveying rollers, and the rear end of the output shaft of the driving motor is fixedly connected with the front end of the left rubber conveying roller.

Preferably, cut the mechanism including setting up in the belt left side and with fixed cutter sword matched with first cutter sword, first through-hole has been seted up on the left side inner wall of protecting tube, first cutter sword is located first through-hole, the left side fixed mounting of protecting tube has multistage electric telescopic handle, multistage electric telescopic handle's output shaft right-hand member and the first left side fixed connection who cuts the sword, fixed and electric connection of rear side has timing controller, timing controller's setting, can set up the time of opening and closing with the reversal to multistage electric telescopic handle's forward, realize the effect that automatic control multistage electric telescopic handle opened.

Preferably, the elastic pressing and fixing mechanism comprises two pressing and fixing blocks, a belt is located between the two pressing and fixing blocks, the right side of the pressing and fixing block located on the right side is fixedly connected with the right side inner wall of the protective pipe, the right side fixedly connected with and electrically connected with a spring lockless pressing switch located on the left side of the pressing and fixing block is arranged on the right side, the spring lockless pressing switch is arranged, the driving motor can be controlled to be turned off when being pressed, the driving motor is controlled to be turned on when the pressing force is released, the control principle is the prior art and is not explained here, the left side fixedly connected with moving rod located on the left side of the pressing and fixing block is arranged on the left side inner wall of the protective pipe, the left end of the moving rod penetrates through the second through hole and extends to the left side of the protective pipe, a guide sleeve is fixedly connected between the top inner wall and the bottom inner wall of the second through hole, the guide sleeve is slidably arranged on the moving rod, the effect that the guide sleeve guides the moving rod plays a guiding role, a first mounting block is fixedly arranged on the left side of the moving rod, the spring mounting block is movably connected with the left side of the spring mounting block, and a spring mounting block is movably connected with the left side of the moving rod.

Preferably, weighing mechanism establishes the weighing plate in the collection box including the slip cover, inlays the dress on the bottom inner wall of collection box and is fixed with weighing sensor, and weighing sensor's weighing end and the bottom fixed connection of weighing plate cooperate through weighing sensor and weighing plate for weigh the belt of collecting, weighing sensor and controller electric connection.

Preferably, the right side of the recovery box is fixedly connected with a pull rod, and the right end of the pull rod extends to the right side of the box-shaped base and is fixedly connected with a pull ring.

Preferably, one side that two consolidated pieces are close to each other all bonds and is fixed with anti-skidding rubber, and the setting of anti-skidding rubber can the effectual circumstances of skidding of reduction consolidated in-process, the left side of the anti-skidding rubber on right side and the right side active contact of belt, and the anti-skidding rubber cover on left side is established on spring does not have lock push type switch.

Compared with the prior art, the beneficial effects of the utility model are that:

1. the belt can be conveyed by matching the conveying mechanism with the driving motor;

2. the belt can be pressed and fixed through the arrangement of the elastic pressing and fixing mechanism;

3. the belt after being pressed and fixed can be automatically cut by matching the cutting mechanism with the fixed cutting knife, and the belt is automatically pressed and cut when the first cutting knife is moved, so that the condition that the belt is directly cut because the belt is not fixed can be effectively avoided without separate operation of personnel, and additional driving equipment for pressing and fixing is not required to be separately arranged;

4. the belt cutting machine has the advantages that the collection box, the weighing mechanism, the audible and visual alarm and the controller are matched, cut belts can be collected, the weight of the collected belts can be weighed, when the preset weight is reached, automatic alarm can be given to remind people to clean the belts, and the influence on the belt blanking efficiency caused by untimely cleaning can be effectively avoided;

the utility model discloses a cut mechanism, elasticity and press solid mechanism and fixed cutter to cooperate, can press the mode that cuts admittedly to the belt automatically when removing first cutter, do not need personnel to part the exclusive operation, can effectually avoid because of not fixing the condition that directly cuts, and cooperate through weighing mechanism and audible-visual annunciator, automatic alarm reminds personnel to clear up when the belt that can be in the collection box is filled with, can effectually avoid influencing the efficiency of belt unloading because of the clearance untimely.

Drawings

Fig. 1 is a schematic perspective view of a belt cutting and recycling device for coal mine transportation according to the present invention;

FIG. 2 is a schematic view of a front cross-sectional structure of the belt cutting and recycling device for coal mine transportation according to the present invention;

fig. 3 is an enlarged schematic view of a portion a in fig. 2.

In the figure: 100. a protective tube; 101. a box-shaped base; 102. a rubber conveying roller; 103. a belt; 104. a guide wheel; 1. a drive motor; 2. a recycling bin; 3. a weighing plate; 4. a weighing sensor; 5. an audible and visual alarm; 6. a controller; 7. fixing a cutting knife; 8. a first cutting knife; 9. pressing and fixing the block; 10. a multi-stage electric telescopic rod; 11. the spring is locked and pressed; 12. a second through hole; 13. a guide sleeve; 14. a travel bar; 15. extruding the block; 16. a second mounting block; 17. a spring; 18. a first mounting block.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1-3, a belt cutting and recycling device for coal mine transportation comprises a box-shaped base 101 with an opening at the right side, a protective pipe 100 is fixedly connected to the top of the box-shaped base 101, a belt 103 for coal mine transportation is arranged in the protective pipe 100, the top of the belt 103 extends to the upper side of the protective pipe 100, a conveying mechanism matched with the belt 103 is rotatably installed between the front inner wall and the rear inner wall of the protective pipe 100, a driving motor 1 with an output shaft fixedly connected with the conveying mechanism is fixedly connected to the front side of the protective pipe 100, the conveying mechanism comprises two rubber conveying rollers 102 rotatably installed between the front inner wall and the rear inner wall of the protective pipe 100, two first pin shafts are fixedly connected between the front inner wall and the rear inner wall of the protective pipe 100, a first circular hole is formed in the front side of the rubber conveying roller 102, two first bearings are fixedly sleeved in the first circular hole, the inner side of an inner ring of each first bearing is fixedly connected with the outer side of the corresponding first pin shaft, the first bearings and the corresponding first pin shafts are matched to achieve the effect of rotating installation of the rubber conveying rollers 102, the belt 103 is movably contacted between the two rubber conveying rollers, and the rear end of the driving motor 1 is fixedly connected with the front end of the output shaft 102 at the left side of the conveying roller;

the two sides of the belt 103 are movably contacted with guide wheels 104, the guide wheels 104 are rotatably installed between the front inner wall and the rear inner wall of the protective tube 100, wherein a second pin shaft is fixedly connected between the front inner wall and the rear inner wall of the protective tube 100, a second circular hole is arranged on the front side of the guide wheel 104, a second bearing is fixedly sleeved in the second circular hole, the inner side of the inner ring of the second bearing is fixedly connected with the outer side of the corresponding second pin shaft, the second bearing and the corresponding second pin shaft are matched to play a role in rotating and installing the guide wheel 104, a fixed cutting knife 7 is fixedly connected on the inner wall on the right side of the protective tube 100, a cutting mechanism is arranged on the left side of the fixed cutting knife 7, the left side of the cutting mechanism extends to the left side of the protective tube 100 and is fixedly connected with the left side of the protective tube 100, the cutting mechanism comprises a first cutting knife 8 which is arranged on the left side of a belt 103 and matched with a fixed cutting knife 7, a first through hole is formed in the inner wall of the left side of the protective pipe 100, the first cutting knife 8 is positioned in the first through hole, a multi-stage electric telescopic rod 10 is fixedly installed on the left side of the protective pipe 100, a supporting rod is fixedly connected to the left side of the protective pipe 100, the bottom of the supporting rod is fixedly connected with the top of the multi-stage electric telescopic rod 10, the multi-stage electric telescopic rod 10 is supported through the supporting rod, the right end of an output shaft of the multi-stage electric telescopic rod 10 is fixedly connected with the left side of the first cutting knife 8, a timing controller is fixedly and electrically connected to the rear side of the multi-stage electric telescopic rod 10, and the timing controller is used for controlling the forward and reverse opening and closing time of the multi-stage electric telescopic rod 10;

an elastic pressing and fixing mechanism matched with a belt 103 and a driving motor 1 is installed on a protective pipe 100, the bottom of an output shaft of a multi-stage electric telescopic rod 10 is fixedly connected with an extrusion block 15 sleeved on the elastic pressing and fixing mechanism, wherein the elastic pressing and fixing mechanism comprises two pressing and fixing blocks 9, one sides of the two pressing and fixing blocks 9 close to each other are fixedly bonded with anti-slip rubber, the left side of the anti-slip rubber on the right side is in movable contact with the right side of the belt 103, the arrangement of the anti-slip rubber is capable of effectively reducing the slipping phenomenon of the belt 103 in the pressing and fixing process and improving the pressing and fixing stability, the belt 103 is positioned between the two pressing and fixing blocks 9, the right side of the pressing and fixing block 9 on the right side is fixedly connected with the inner wall on the right side of the protective pipe 100, a spring non-locking pressing switch 11 electrically connected with the pressing block 9 on the right side of the left side is fixedly connected with a movable rod 14, the inner wall on the left side of the pressing and fixing block 9 on the left side is fixedly connected with a movable rod 14, a second through hole 12 is formed on the inner wall of the movable rod 14, the movable rod 14 is provided with a first through a second through hole 14, the movable rod 14 is capable of preventing the movable block 14, the movable block 14 is capable of preventing block 14, the movable block 14, a second sliding hole is formed in the right side of the extrusion block 15, the inner wall of the second sliding hole is connected with the outer side of the moving rod 14 in a sliding mode, the right side of the extrusion block 15 is fixedly connected with the left side of the second mounting block 16, a spring 17 is fixedly connected between the right side of the second mounting block 16 and the left side of the first mounting block 18, and the spring 17 is movably sleeved on the moving rod 14;

the right side of the protective tube 100 is fixedly connected with an audible and visual alarm 5, the front side of the audible and visual alarm 5 is fixedly and electrically connected with a controller 6, a recovery box 2 with an opening at the top is movably sleeved in a box-shaped base 101, the right side of the recovery box 2 is fixedly connected with a pull rod, the right end of the pull rod extends to the right side of the box-shaped base 101 and is fixedly connected with a pull ring, the recovery box 2 is pulled through the matching of the pull ring and the pull rod, a weighing mechanism electrically connected with the controller 6 is fixedly installed in the recovery box 2, the weighing mechanism comprises a weighing plate 3 which is sleeved in the recovery box 2 in a sliding manner, a weighing sensor 4 is fixedly embedded on the inner wall of the bottom of the recovery box 2, a mounting groove for installing the weighing sensor 4 is formed on the inner wall of the bottom of the recovery box 2, and the weighing end of the weighing sensor 4 is fixedly connected with the bottom of the weighing plate 3,

weighing sensor

4 and 6 electric connection of controller, weighing sensor 4 is used for weighing the weight of the belt 103 of collecting, and the setting of cooperation controller 6 simultaneously can be reached and open the warning personnel through controller 6 control audible-visual annunciator 5 when predetermineeing the weight value, the utility model discloses a cut the mechanism, elasticity is pressed solid mechanism and fixed cutter 7 and is cooperateed, can be when removing first cutter 8 automatic to the belt 103 press solid mode of cutting, do not need personnel separately to operate alone, can effectually avoid directly carrying out the condition of cutting because of not fixing, and cooperate through weighing mechanism and audible-visual annunciator, can be when filling with belt 103 in collection box 2 automatic alarm remind personnel's clearance, can effectually avoid influencing the efficiency of belt 103 unloading because of the clearance is untimely.

The working principle is as follows: when the belt cutting machine is used for cutting a belt 103 for coal mine transportation, one end of the belt 103 is placed in a protective pipe 100, a time interval between forward starting and reverse starting of a multi-stage electric telescopic rod 10 is set through a timing controller, then a driving motor 1 is started, an output shaft of the driving motor 1 drives a left rubber conveying roller 102 to rotate, the left rubber conveying roller 102 moves downwards and simultaneously carries out friction conveying on the belt 103, so that the bottom end of the belt 103 moves downwards, the belt 103 moves downwards between two guide wheels 104, the bottom end of the belt 103 sequentially passes through a space between a fixed cutting knife 7 and a first cutting knife 8 and between two pressing and fixing blocks 9, when the multi-stage electric telescopic rod 10 reaches the forward starting time, the timing controller controls the multi-stage electric telescopic rod 10 to open forwards, the output shaft of the multi-stage electric telescopic rod 10 drives the first cutting knife 8 to move rightwards, the output shaft of the multi-stage electric telescopic rod 10 drives an extrusion block 15, the extrusion block 15 drives the second installation block 16 to move rightwards, the second installation block 16 drives the first installation block 18 to move rightwards through the spring 17, the first installation block 18 drives the moving rod 14 to move rightwards, the moving rod 14 drives the left pressing block 9 to move rightwards, the left pressing block 9 drives the spring non-lock pressing switch 11 to move rightwards until the spring non-lock pressing switch 11 moves rightwards to be contacted with the left side of the belt 103, the left pressing block 9 stops moving, the spring non-lock pressing switch 11 is triggered to be started, the spring non-lock pressing switch 11 controls the driving motor 1 to be closed, the belt 103 stops moving, the extrusion block 15 which continues to move drives the second installation block 16 to slide rightwards on the moving rod 14 and compress the spring 17, the second installation block 16 extrudes the first installation block 18 rightwards through the spring 17, the first installation block 18 drives the left pressing block 9 to move rightwards through the moving rod 14 to extrude the belt 103 through the rightward movement of the moving rod 14 Under the action of the extrusion force, the belt 103 is pressed and fixed, and the belt 103 is cut by matching the fixed cutting knife 104 while the first cutting knife 8 moves rightwards, so that the belt 103 is cut off;

after cutting, the customized controller controls the multi-stage electric telescopic rod 10 to be started reversely, so that the first cutting knife 8 moves leftwards to be separated from the belt 103, the output shaft of the multi-stage electric telescopic rod 10 drives the second mounting block 16 to move leftwards through the extrusion block 15 and releases the compression on the spring 17, the elastic force of the spring 17 in a compression state is gradually reset at the moment, when the spring 17 is completely reset, the second mounting block 16 moving leftwards sequentially passes through the spring 17, the first mounting block 18 and the moving rod 14 to drive the left pressing and fixing block 9 to move leftwards, the left pressing and fixing block 9 is separated from the belt 103 leftwards, the left pressing and fixing block 9 also drives the spring lock-free pressing switch 11 to be separated from the belt 103, at the moment, the spring lock-free pressing switch 11 controls the driving motor 1 to start again to convey the belt 103, when the fixing of the belt 103 is released, the cut belt 103 falls into the recovery box 2 under the action of gravity, and the recovery box 2 collects the belt 103, so that the purpose of automatically pressing and fixing and cutting the belt 103 when the first cutting knife 8 is moved is achieved, no separate and independent operation is needed by personnel, and the situation that the cutting is directly performed due to unfixed belt can be effectively avoided;

along with the going on of cutting work, make 2 inside cutting off belt 103 of collection box more and more, weighing sensor 4 weighs the total weight of belt 103 of cutting off through weighing plate 3, when reaching preset weight value, then prove that belt 103 in collection box 2 has filled, weighing sensor 4 gives controller 6 with signal transmission this moment, controller 6 control audible-visual annunciator 5 opens, audible-visual annunciator 5 sends audible-visual annunciator and reminds personnel, make things convenient for personnel in time to discover, personnel can drive collection box 2 through pull ring pulling pull rod and move out from box base 101 this moment, can pour the clearance with belt 103 in collection box 2, make can be when belt 103 in collection box 2 fills with, personnel's clearance is reminded in automatic alarm, can effectually avoid influencing the efficiency of belt 103 unloading because of the untimely clearance.

In the description of the present application, it should be further noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may include, for example, a fixed connection, a detachable connection, an integral connection, a mechanical connection, an electrical connection, a direct connection, a connection through an intermediate medium, and a connection between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to specific circumstances.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. The utility model provides a coal mine transportation belt cuts recovery unit, includes box-shaped base (101) that the right side set up for the opening, the top fixedly connected with protective tube (100) of box-shaped base (101), be equipped with belt (103) that are used for coal mine transportation in protective tube (100), the top of belt (103) extends to the top of protective tube (100), a serial communication port, rotate between the front side inner wall of protective tube (100) and the rear side inner wall and install the conveying mechanism with belt (103) matched with, the front side fixedly connected with output shaft of protective tube (100) and conveying mechanism fixed connection's driving motor (1), the equal movable contact in both sides of belt (103) has leading wheel (104), leading wheel (104) rotate install between the front side inner wall of protective tube (100) and rear side inner wall, fixedly connected with fixed cutting knife (7) on the right side inner wall of protective tube (100), the left side of fixed cutting knife (7) is equipped with the mechanism that cuts, the left side of cutting mechanism extends to the left side of protective tube (100) and is connected with the left side fixed audible-visual alarm (5) that the fixed alarm is connected with, the sound-light and sound-light alarm (5) fixed pressing mechanism that is connected with presses and is connected with on the protective tube (5), a recovery box (2) with an opening at the top is movably sleeved in the box-shaped base (101), and a weighing mechanism electrically connected with the controller (6) is fixedly installed in the recovery box (2).

2. The belt cutting and recycling device for coal mine transportation according to claim 1, characterized in that the conveying mechanism comprises two rubber conveying rollers (102) rotatably mounted between the front inner wall and the rear inner wall of the protective pipe (100), the belt (103) is movably contacted between the two rubber conveying rollers (102), and the rear end of the output shaft of the driving motor (1) is fixedly connected with the front end of the left rubber conveying roller (102).

3. The coal mine transportation belt cuts recovery unit according to claim 2, characterized in that, cut the mechanism including set up in belt (103) left side and with fixed cutter (7) matched with first cutter (8), first through-hole has been seted up on the left side inner wall of protecting tube (100), first cutter (8) are located first through-hole, the left side fixed mounting of protecting tube (100) has multistage electric telescopic handle (10), the output shaft right-hand member of multistage electric telescopic handle (10) and the left side fixed connection of first cutter (8), the fixed and electric connection of rear side of multistage electric telescopic handle (10) has timing controller.

4. The cutting and recycling device for the coal mine transportation belt as claimed in claim 3, wherein the elastic pressing and fixing mechanism comprises two pressing and fixing blocks (9), the belt (103) is positioned between the two pressing and fixing blocks (9), the right side of the pressing and fixing block (9) positioned on the right side is fixedly connected with the right inner wall of the protective pipe (100), the right side of the pressing and fixing block (9) positioned on the left side is fixedly connected with a spring lock-free pressing type switch (11) electrically connected with the driving motor (1), the left side of the pressing and fixing block (9) positioned on the left side is fixedly connected with a moving rod (14), the left inner wall of the protective pipe (100) is provided with a second through hole (12), the left end of the moving rod (14) penetrates through the second through hole (12) and extends to the left side of the protective pipe (100), a guide sleeve (13) is fixedly connected between the top inner wall and the bottom inner wall of the second through hole (12), the guide sleeve (13) is slidably sleeved on the moving rod (14), a first mounting block (18) is fixedly sleeved on the moving rod (14), the left side of the first mounting block (18) is provided with a sliding sleeve which is sleeved on the moving rod (14), and a pressing and fixing block (16) is connected with a pressing block (16) which is connected with a second mounting block (16), the spring (17) is movably sleeved on the moving rod (14).

5. The belt cutting and recycling device for coal mine transportation according to claim 1, wherein the weighing mechanism comprises a weighing plate (3) slidably sleeved in the recycling bin (2), a weighing sensor (4) is fixedly embedded in the inner wall of the bottom of the recycling bin (2), the weighing end of the weighing sensor (4) is fixedly connected with the bottom of the weighing plate (3), and the weighing sensor (4) is electrically connected with the controller (6).

6. The belt cutting and recycling device for coal mine transportation according to claim 1, characterized in that a pull rod is fixedly connected to the right side of the recycling box (2), and the right end of the pull rod extends to the right side of the box-shaped base (101) and is fixedly connected with a pull ring.

7. The belt cutting and recycling device for coal mine transportation according to claim 4, characterized in that the side of each of the two pressing blocks (9) close to each other is fixedly bonded with an anti-skid rubber sheet, the left side of the anti-skid rubber sheet on the right side is movably contacted with the right side of the belt (103), and the anti-skid rubber sheet on the left side is sleeved on the spring lock-free pressing switch (11).