Automatic conveying belt switching device

Abstract

The utility model discloses an automatic switching conveyer belt device, which relates to the technical field of braid conveying, and comprises a base and a winding drum, the top of the base is connected with a position changing assembly, the position changing assembly is connected with two unwinding assemblies, the winding drum can be installed on the unwinding assemblies, and the winding drum is connected with the position changing assembly. The position changing assembly is used for changing the positions of the two unwinding assemblies to the unwinding positions in turn. By means of the arranged transposition assembly, the first driving mechanism is started to drive the round roller to alternately rotate by 180 degrees clockwise or anticlockwise, the round roller can drive the two unwinding assemblies to alternately rotate to the overturning position, and therefore after a conveying belt of a winding drum on one unwinding assembly is unwound, the winding drum on the other unwinding assembly can rotate to the overturning position. When the winding drum is replaced, the other unwinding assembly provided with a new winding drum can be driven to rotate to the unwinding position through the position changing assembly, so that neutral gear pause of conveying of the conveying belt due to winding drum replacement can be avoided, and the conveying efficiency of the braid is effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of tape conveyor, especially a kind of automatic switching conveyor belt device. BACKGROUND

[0002] Tape is a kind of narrow or tubular fabric made of various yarns, widely used in clothing, shoe material, luggage, industry, agriculture, military and transportation fields, and the raw materials of tape include cotton thread, hemp thread, polyamide, vinylon, polyester, polypropylene, spandex and viscose, and the manufacturing process mainly includes weaving, knotting and knitting three categories.

[0003] Tape is a kind of narrow or tubular fabric made of various yarns, widely used in clothing, shoe material, luggage, industry, agriculture, military and transportation fields, and the raw materials of tape include cotton thread, hemp thread, polyamide, vinylon, polyester, polypropylene, spandex and viscose, and the manufacturing process mainly includes weaving, knotting and knitting three categories.

[0004] When the tape on the unwinding device is unwound, the tape will pass through the subsequent conveying path and go through each processing procedure.

[0005] In order to solve the above problems, an automatic switching conveyor belt device is needed. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing an automatic switching conveyor belt device to solve the problem that the existing unwinding device needs to spend a certain amount of time when replacing the already unwound roll installed thereon and installing a new roll thereon, and the unwinding and conveying of the tape will be paused during the roll replacement process, resulting in reduced conveying and processing efficiency of the tape.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: an automatic switching conveyor belt device, comprising a base and a roll, the top of the base is connected with a transposition assembly, two unwinding assemblies are connected on the transposition assembly, and the roll can be installed on the unwinding assembly.

[0008] The transposition assembly is used to rotate the two unwinding assemblies to the unwinding position alternately.

[0009] The unwinding assembly is used for unwinding the to-be-conveyed fabric belt on the winding drum from the winding drum.

[0010] Preferably, the transposition assembly comprises two vertical plates fixedly connected on the top of the base in symmetry, a first driving mechanism is fixedly connected on the right side surface of the vertical plate on the right side, a round roller is rotationally connected between the two vertical plates through a first rotating rod, the right end of the first rotating rod penetrates through the vertical plate on the right side and is connected with the first driving mechanism, and the two unwinding assemblies are connected on the round roller and are symmetrically distributed with the axis of the round roller as the reference. The advantage of this arrangement is that the first driving mechanism is started to drive the round roller to alternately rotate one hundred and eighty degrees clockwise or counterclockwise, and the round roller can drive the two unwinding assemblies to rotate one hundred and eighty degrees clockwise or counterclockwise to make the two unwinding assemblies rotate to the unwinding position in turn, so that the unwinding assembly can unwind the conveying belt in the winding drum thereon to the conveying path for conveying.

[0011] Preferably, the unwinding assembly comprises two fixed plates fixedly connected on the outer circumferential surface of the round roller in symmetry, a second driving mechanism is fixedly connected on the left side surface of the fixed plate on the left side, a clamping mechanism for clamping the winding drum is connected between the two fixed plates, the two second driving mechanisms are connected with the two clamping mechanisms respectively, and a dismounting mechanism for quickly dismounting the winding drum from the clamping mechanism is further connected between the two fixed plates. The advantage of this arrangement is that the winding drum is clamped between the two fixed plates through the clamping mechanism, so that the second driving mechanism can drive the winding drum to rotate to unwind the to-be-conveyed fabric belt on the winding drum to the conveying path for conveying, and meanwhile the dismounting mechanism can dismount the winding drum after unwinding from between the two fixed plates, so that the replacement operation of the winding drum is quickly completed, and the convenience and reliability of the device are improved.

[0012] Preferably, the clamping mechanism comprises a clamping plate, the second driving mechanism is fixedly connected with the left side surface of the clamping plate, a limiting rod is fixedly connected with the right side surface of the clamping plate, the winding drum is movably sleeved on the outer circumferential surface of the limiting rod, the clamping mechanism further comprises two pairs of air cylinders fixedly connected on the right side surface of the fixed plate on the right side in symmetry, the output ends of the two pairs of air cylinders penetrate through the fixed plate on the right side and are fixedly connected with clamping rings, the clamping rings are movably sleeved on the outer circumferential surface of the limiting rod, the left side surface of the clamping ring can abut against the right side surface of the winding drum, and the right side surface of the clamping plate can abut against the left side surface of the winding drum. The advantage of this arrangement is that the winding drum is movably sleeved on the outer circumferential surface of the limiting rod, then the air cylinders are started to push the clamping ring to move leftward until the clamping plate clamps and fixes the winding drum, so that the second driving mechanism can drive the winding drum to rotate through the clamping plate to stably complete the unwinding operation of the conveying belt.

[0013] Preferably, the dismounting mechanism comprises a swing plate hinged to the right side of the fixed plate away from the side surface of the roller, a hydraulic cylinder is hinged between the left side surface of the swing plate and the outer peripheral surface of the roller, the hydraulic cylinder can push the swing plate to move away from or close to the right side surface of the limiting rod when extending or retracting, the cylinder is fixedly connected to the right side surface of the swing plate, and the output ends of the two pairs of cylinders penetrate the swing plate and are fixedly connected to the right side surface of the clamping ring.

[0014] Preferably, the base is further connected with a limiting assembly, the limiting assembly comprises two pairs of connecting blocks symmetrically and fixedly connected to the side surfaces of the two fixed plates and the two swing plates based on the axis of the roller, the side surfaces of the two pairs of connecting blocks away from the fixed plates are provided with insertion grooves, the limiting assembly further comprises two mounting plates symmetrically and fixedly connected to the top of the two vertical plates, two pairs of first electric push rods are symmetrically and fixedly connected to the side surfaces away from each other of the two mounting plates, the output ends of the two pairs of first electric push rods penetrate the two mounting plates and are symmetrically and fixedly connected with two supporting blocks, the bottom of the two supporting blocks is symmetrically and fixedly connected with two insertion rods and two travel switches, the bottom ends of the two insertion rods can be inserted into the two adjacent insertion grooves, the top surfaces of the two adjacent connecting blocks can trigger the two travel switches, and two clamping mechanisms are symmetrically connected to the two insertion rods.

[0015] In conclusion, the technical effects and advantages of the utility model are as follows:

[0016] 1、the utility model discloses, through setting up the transposition assembly, the first drive mechanism is started with the roller clockwise or counterclockwise alternation rotation one hundred and eighty degrees, and the roller can drive two pay-off assemblies to rotate to the rolling position alternately, so that the pay-off assembly on the reel of the conveying belt can be rotated to the pay-off position through the transposition assembly after the pay-off of the reel, and the reel that has been payed off can be rotated to the place away from the pay-off position to facilitate the staff to replace the reel, so that the conveying of the conveying belt can be avoided to pause because of replacing the reel, and the conveying efficiency of the pair of belts is effectively improved.

[0017] 2. The utility model discloses, through the setting of limiting component, the first drive mechanism is started and drives unwinding assembly to rotate until two insertion rods are inserted into the slot on fixed plate and swing board respectively, then through chucking mechanism, the insertion rod is clamped in two slots respectively, so this can be positioned and fixed to fixed plate and swing board, thereby ensure the position stability of unwinding assembly when unwinding work, ensure that the unwinding work of the conveyer belt can be smoothly and reliably carried out, effectively improve the reliability and practicality of the device. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can also be obtained according to these drawings without creating labor.

[0019] Figure 1 It is the first structural schematic drawing of the utility model;

[0020] Figure 2 It is the second structural schematic drawing of the utility model;

[0021] Figure 3 It is the side view of limiting mechanism in the utility model;

[0022] Figure 4 It is the utility model in Figure 1 The enlarged schematic view of A place in;

[0023] Figure 5 It is the utility model in Figure 3 The enlarged schematic view of B place.

[0024] In the drawing: 1, base;2, transposition assembly;21, vertical board;22, first drive mechanism;23, round roller;3, unwinding assembly;31, fixed plate;32, second drive mechanism;33, clamping mechanism;331, clamping plate;332, limiting rod;333, air cylinder;334, clamping ring;34, dismounting mechanism;341, swing board;342, hydraulic cylinder;4, limiting component;41, connecting block;411, slot;42, mounting plate;43, first electric push rod;44, support block;45, insertion rod;46, travel switch;47, chucking mechanism;471, straight hole;472, third electric push rod;473, push block;474, cross bar;475, drive plate;476, top block;477, top slot;5, winding drum. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0026] Please refer to Figures 1-5 The automatic switching conveying belt device shown in the figure comprises a base 1 and a winding drum 5, the top of the base 1 is connected with a transposition assembly 2, two unwinding assemblies 3 are connected on the transposition assembly 2, and the winding drum 5 can be installed on the unwinding assembly 3.

[0027] The transposition assembly 2 is used for rotating the two unwinding assemblies 3 to the unwinding position alternately.

[0028] The unwinding assembly 3 is used for unwinding the conveying belt on the winding drum 5 from the winding drum 5.

[0029] Please refer to Figure 1 and Figure 2 The transposition assembly 2 comprises two vertical plates 21 fixedly connected on the top of the base 1 symmetrically, the right side surface of the vertical plate 21 on the right side is fixedly connected with a first driving mechanism 22, a round roller 23 is rotatably connected between the two vertical plates 21 through a first rotating rod, the right end of the first rotating rod penetrates through the right side vertical plate 21 and is connected with the first driving mechanism 22, and the two unwinding assemblies 3 are connected on the round roller 23 and are symmetrically distributed with the axis of the round roller 23 as the reference.

[0030] Specifically, the first driving mechanism 22 is started to drive the round roller 23 to rotate clockwise or counterclockwise alternately by one hundred and eighty degrees, the round roller 23 can drive the two unwinding assemblies 3 to rotate clockwise or counterclockwise by one hundred and eighty degrees to make the two unwinding assemblies 3 rotate to the unwinding position alternately, so that the unwinding assembly 3 can unwind the conveying belt in the winding drum 5 on it to the conveying path for conveying.

[0031] Please refer to Figures 1-4 The unwinding assembly 3 comprises two fixed plates 31 fixedly connected on the outer circumferential surface of the round roller 23 symmetrically, the left side surface of the fixed plate 31 on the left side is fixedly connected with a second driving mechanism 32, a clamping mechanism 33 for clamping the winding drum 5 is connected between the two fixed plates 31, the two second driving mechanisms 32 are connected with the two clamping mechanisms 33 respectively, and a dismounting mechanism 34 for quickly dismounting the winding drum 5 from the clamping mechanism 33 is further connected between the two fixed plates 31.

[0032] Specifically, the winding drum 5 is clamped between the two fixed plates 31 by the clamping mechanism 33, so that the second driving mechanism 32 can drive the winding drum 5 to rotate to pay off the belt on the winding drum 5 into the conveying path for conveying, and the winding drum 5 can be disassembled from between the two fixed plates 31 by the disassembly mechanism 34, so that the replacement operation of the winding drum 5 can be quickly completed, and the convenience and reliability of the device are improved.

[0033] Referring to Figure 1 , Figure 2 and Figure 4 , the clamping mechanism 33 includes a clamping plate 331, the second driving mechanism 32 is fixedly connected to the left side of the clamping plate 331, the right side of the clamping plate 331 is fixedly connected to a limiting rod 332, the winding drum 5 is movably sleeved on the outer circumferential surface of the limiting rod 332, the clamping mechanism 33 further includes two pairs of air cylinders 333 fixedly connected to the right side of the right fixed plate 31, the output ends of the two pairs of air cylinders 333 penetrate the right fixed plate 31 and are fixedly connected to a clamping ring 334, the clamping ring 334 is movably sleeved on the outer circumferential surface of the limiting rod 332, and the left side of the clamping ring 334 can abut against the right side of the winding drum 5. The right side of the clamping plate 331 can abut against the left side of the winding drum 5.

[0034] Specifically, the winding drum 5 is movably sleeved on the outer circumferential surface of the limiting rod 332, then the air cylinder 333 is started to push the clamping ring 334 to move left until the winding drum 5 is clamped and fixed by the clamping plate 331, so that the second driving mechanism 32 can drive the winding drum 5 to rotate through the clamping plate 331 to stably complete the pay-off operation of the conveying belt.

[0035] Referring to Figure 1 and Figure 4 , the disassembly mechanism 34 includes a swing plate 341 hinged to the side of the right fixed plate 31 away from the circular roller 23, a hydraulic cylinder 342 is hinged between the left side of the swing plate 341 and the outer circumferential surface of the circular roller 23, the hydraulic cylinder 342 can push the swing plate 341 to move away from or close to the right side of the limiting rod 332 when it is extended or retracted, the air cylinder 333 is fixedly connected to the right side of the swing plate 341, and the output ends of the two pairs of air cylinders 333 penetrate the swing plate 341 and are fixedly connected to the right side of the clamping ring 334.

[0036] Specifically, the hydraulic cylinder 342 is started to extend to drive the swing plate 341 to swing away from the right end of the limiting rod 332, so that the clamping ring 334 can swing away from the right side of the winding drum 5, thereby facilitating the winding drum 5 to be taken off from the limiting rod 332.

[0037] Referring to Figure 3 and Figure 5The base 1 is further connected with a limiting assembly 4. The limiting assembly 4 comprises two pairs of connecting blocks 41 which are symmetrically and fixedly connected to the side surfaces of the two fixed plates 31 and the two swing plates 341 based on the axis line of the round roller 23. The side surfaces away from the fixed plates 31 of the two pairs of connecting blocks 41 are provided with insertion grooves 411. The limiting assembly 4 further comprises two installation plates 42 which are symmetrically and fixedly connected to the top of the two vertical plates 21. The side surfaces away from each other of the two installation plates 42 are symmetrically and fixedly connected with two pairs of first electric push rods 43. The output ends of the two pairs of first electric push rods 43 are penetrated through the two installation plates 42 and are symmetrically and fixedly connected with two supporting blocks 44. The bottom of the two supporting blocks 44 is symmetrically and fixedly connected with an insertion rod 45 and two travel switches 46. The bottom end of the two insertion rods 45 can be inserted into the adjacent two insertion grooves 411. The two travel switches 46 can be triggered by the top surface of the adjacent two connecting blocks 41. The two insertion rods 45 are symmetrically connected with clamping mechanisms 47. The two clamping mechanisms 47 can clamp the two insertion rods 45 in the two insertion grooves 411 respectively.

[0038] Specifically, the first driving mechanism 22 is started to drive the unwinding assembly 3 to rotate until the two insertion rods 45 are inserted into the insertion grooves 411 on the fixed plates 31 and the swing plates 341 respectively. Then the insertion rods 45 are clamped in the two insertion grooves 411 by the clamping mechanisms 47. In this way, the fixed plates 31 and the swing plates 341 can be limited and fixed, thereby ensuring the position stability of the unwinding assembly 3 during the unwinding work, ensuring that the unwinding work of the conveying belt can be smoothly and reliably carried out, and effectively improving the reliability and practicality of the device.

[0039] The clamping mechanism 47 comprises a straight hole 471 which is formed in the bottom end of the insertion rod 45. The top end of the straight hole 471 penetrates through the top end of the insertion rod 45 and the top wall of the supporting block 44. The top of the supporting block 44 is fixedly connected with a third electric push rod 472. The output end of the third electric push rod 472 extends into the straight hole 471 and is fixedly connected with a push block 473. The clamping mechanism 47 further comprises two cross rods 474 which are symmetrically and rotationally connected to the bottom end of the insertion rod 45 through the second rotating rod and the second torsion spring. Two driving plates 475 are symmetrically and fixedly connected to the outer circumferential surface of the two cross rods 474. The push block 473 can drive the two driving plates 475 to rotate in opposite directions. Two top blocks 476 are symmetrically and fixedly connected to the outer circumferential surface of the two cross rods 474. The clamping mechanism 47 further comprises two top grooves 477 which are symmetrically formed in the front and rear inner side walls of the insertion groove 411. The two top blocks 476 can tightly abut against the inner top walls of the two top grooves 477.

[0040] The third electric push rod 472 is started to push the push block 473 to move downwards until the two driving plates 475 are rotated in opposite directions, the driving plates 475 drive the top blocks 476 to rotate in opposite directions through the cross rods 474 until the top surfaces of the two top blocks 476 are tightly abutted against the inner top walls of the two top grooves 477, so that the insertion rods 45 and the connecting blocks 41 are clamped and connected together, thereby improving the position stability of the unwinding assembly 3.

[0041] Working principle: when the conveying belt on the winding drum 5 is unwound, the first driving mechanism 22 is started to drive the circular roller 23 to rotate clockwise or counterclockwise by 180 degrees alternately, the circular roller 23 can drive the two unwinding assemblies 3 to rotate clockwise or counterclockwise by 180 degrees so that the other unwinding assembly 3 provided with a new winding drum 5 is rotated to the unwinding position.

[0042] Then the two pairs of first electric push rods 43 are started to push the two insertion rods 45 to move to the top of the insertion grooves 411 on the top of the connecting blocks 41 on the adjacent fixed plates 31 and swing plates 341 respectively, then the first driving mechanism 22 is started to drive the unwinding assembly 3 to rotate counterclockwise until the two insertion rods 45 are inserted into the two insertion grooves 411 respectively, and at this time the top of the connecting block 41 is provided with a travel switch 46, then the travel switch 46 transmits a signal to the central processor shown in the figure, the central processor starts the third electric push rod 472 to push the push block 473 to move downwards until the two driving plates 475 are rotated in opposite directions, the driving plates 475 drive the top blocks 476 to rotate in opposite directions through the cross rods 474 until the top surfaces of the two top blocks 476 are tightly abutted against the inner top walls of the two top grooves 477, so that the insertion rods 45 and the connecting blocks 41 are clamped and connected together, thereby improving the position stability of the unwinding assembly 3.

[0043] The winding drum 5 that is unwound is rotated to the non-unwinding position, then the starting cylinder 333 is started to push the clamping ring 334 to move to the right until the clamping plate 331 is away from the winding drum 5, then the hydraulic cylinder 342 is started to extend to drive the swing plate 341 to swing away from the right end of the limiting rod 332, so that the clamping ring 334 is driven to swing away from the right side of the winding drum 5, thereby facilitating the winding drum 5 to be taken off from the limiting rod 332, so that the disassembly work of the winding drum 5 is completed, then a new winding drum 5 is installed to wait for the next winding drum 5 position change.

[0044] It should be pointed out finally: the above is only the preferred embodiment of the utility model, and is not used to limit the utility model, although the utility model is described in detail with reference to the foregoing embodiments, for the person skilled in the art, it still can modify the technical scheme recorded in the foregoing each embodiment, or equivalent replacement is carried out to part of technical features, any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the utility model, should be contained in the protection scope of the utility model.

Claims

1. An automatic changeover conveyor belt device comprising a base (1) and a reel (5), characterized in that: The top of the base (1) is connected with a transposition assembly (2), two unwinding assemblies (3) are connected on the transposition assembly (2), and the winding drum (5) can be installed on the unwinding assembly (3); The transposition assembly (2) is used for rotating the two unwinding assemblies (3) to the unwinding position alternately; The unwinding assembly (3) is used for unwinding the to-be-conveyed woven belt on the winding drum (5) from the winding drum (5).

2. An automatic changeover conveyor belt apparatus as claimed in claim 1, wherein: The transposition assembly (2) comprises two vertical plates (21) which are fixedly connected on the top of the base (1) in a symmetrical mode, a first driving mechanism (22) is fixedly connected on the right side surface of the vertical plate (21) located on the right side, a round roller (23) is rotationally connected between the two vertical plates (21) through a first rotating rod, the right end of the first rotating rod penetrates through the right side vertical plate (21) and is connected with the first driving mechanism (22), and the two unwinding assemblies (3) are connected on the round roller (23) and are symmetrically distributed with the axis line of the round roller (23) as a reference.

3. An automatic changeover conveyor belt apparatus as claimed in claim 2, wherein: The unwinding assembly (3) comprises two fixed plates (31) which are fixedly connected on the outer circumferential surface of the round roller (23) in a left-right symmetrical mode, a second driving mechanism (32) is fixedly connected on the left side surface of the fixed plate (31) located on the left side, a clamping mechanism (33) for clamping the winding drum (5) is connected between the two fixed plates (31), the two second driving mechanisms (32) are connected with the two clamping mechanisms (33) respectively, and a dismounting mechanism (34) for quickly dismounting the winding drum (5) from the clamping mechanism (33) is further connected between the two fixed plates (31).

4. An automatic changeover conveyor belt apparatus as claimed in claim 3, wherein: The clamping mechanism (33) comprises a clamping plate (331), the second driving mechanism (32) is fixedly connected with the left side surface of the clamping plate (331), a limiting rod (332) is fixedly connected on the right side surface of the clamping plate (331), the winding drum (5) is movably sleeved on the outer circumferential surface of the limiting rod (332), the clamping mechanism (33) further comprises two pairs of air cylinders (333) which are fixedly connected on the right side surface of the right side fixed plate (31) in a symmetrical mode, the output ends of the two pairs of air cylinders (333) penetrate through the right side fixed plate (31) and are fixedly connected with a clamping ring (334), the clamping ring (334) is movably sleeved on the outer circumferential surface of the limiting rod (332), the left side surface of the clamping ring (334) can abut against the right side surface of the winding drum (5), and the right side surface of the clamping plate (331) can abut against the left side surface of the winding drum (5).

5. An automatic changeover conveyor belt apparatus as claimed in claim 4, wherein: The dismounting mechanism (34) comprises a swing plate (341) which is hinged on the side surface of the right side fixed plate (31) away from the round roller (23), a hydraulic cylinder (342) is hinged between the left side surface of the swing plate (341) and the outer circumferential surface of the round roller (23), the hydraulic cylinder (342) can push the swing plate (341) to move away from or close to the right side surface of the limiting rod (332) when being extended or retracted, the air cylinders (333) are fixedly connected on the right side surface of the swing plate (341), and the output ends of the two pairs of air cylinders (333) penetrate through the swing plate (341) and are fixedly connected with the right side surface of the clamping ring (334).

6. An automatic changeover conveyor belt apparatus as claimed in claim 5, wherein: The base (1) is also connected with a limiting assembly (4), the limiting assembly (4) comprises two pairs of connecting blocks (41) which are fixedly connected on the side surfaces of two fixed plates (31) and two swing plates (341) in a symmetrical manner with the axis of the circular roller (23) as reference, the side surfaces of the two pairs of connecting blocks (41) far away from the fixed plates (31) are provided with insertion grooves (411), the limiting assembly (4) further comprises two mounting plates (42) which are fixedly connected on the top of two vertical plates (21) in a symmetrical manner, two pairs of first electric push rods (43) are fixedly connected on the side surfaces of the two mounting plates (42) far away from each other in a symmetrical manner, the output ends of the two pairs of first electric push rods (43) penetrate through the two mounting plates (42) and are fixedly connected with two supporting blocks (44) in a symmetrical manner, the bottom of the two supporting blocks (44) is fixedly connected with an insertion rod (45) and two travel switches (46) in a symmetrical manner, the bottom end of the two insertion rods (45) can be inserted into two adjacent insertion grooves (411), the two travel switches (46) can be triggered by the top surfaces of two adjacent connecting blocks (41), two clamping mechanisms (47) are connected on the two insertion rods (45) in a symmetrical manner, and the two clamping mechanisms (47) can clamp the two insertion rods (45) in the two insertion grooves (411) respectively.

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