CN210840722U

CN210840722U - Alternating high-altitude picking and collecting device

Info

Publication number: CN210840722U
Application number: CN201921620908.7U
Authority: CN
Inventors: 余军; 林珮汝; 黄鑫宸; 林雅萍; 张永健; 曾景华
Original assignee: Xiamen University
Current assignee: Xiamen University
Priority date: 2019-09-27
Filing date: 2019-09-27
Publication date: 2020-06-26
Anticipated expiration: 2029-09-27

Abstract

The utility model relates to an alternating high-altitude picking and collecting device, which relates to the field of agricultural fruit picking tools and comprises a shearing mechanism and a conveying mechanism, wherein the shearing mechanism comprises scissors, a handle and a transmission component, the scissors and the handle are respectively fixed at two ends of the transmission component, and the handle can control the scissors to carry out shearing operation through the transmission component; the conveying mechanism comprises a support, a moving assembly and two net bags, the moving assembly comprises two pulleys fixed with the support and a synchronous belt sleeved on the two pulleys, the two net bags are connected to the synchronous belt and are configured to be lifted when one net bag descends, and the support is sleeved on the transmission assembly to enable the conveying mechanism to rotate relative to the shearing mechanism and move along the length direction. The utility model provides a collection device is picked in alternating high altitude's transport mechanism can cut the mechanism relatively and rotate and remove along length direction, has guaranteed sufficient degree of freedom, and operating personnel can find suitable angle always and make the string bag be located the scissors below in order to catch target fruit.

Description

Alternating high-altitude picking and collecting device

Technical Field

The utility model relates to an agricultural fruit picking tool field especially relates to a collection device is picked in alternating high altitude.

Background

In the vast rural areas, agricultural production is widely managed by multiple operations, and economic crops, particularly fruits, are massively produced and put on the market, so that the dietary varieties of people are enriched, and the life quality of people is improved. The problems of large labor workload, wide operation range (uneven fruit distribution), high touch force control requirement (juicy fruits are easy to damage), selective picking (inconsistent mature period of single fruit) and the like exist in mass production fruit picking, so that manual picking is still adopted in most ranges throughout the country. However, manual picking requires climbing trees or climbing stairs, the picking speed is slow, the labor intensity is high, and operators are easily injured.

For the above reasons, some fruit picking devices appear on the market, and there are three main types which are popular: the existing fruit picking device can help workers pick fruits in high altitude to a certain extent, but the design focuses on how to pick the fruits and how to not damage the fruits as much as possible when picking the fruits, and how to pick the fruits efficiently and how to convey the fruits back to the ground are not considered.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a collection device is picked in alternating high altitude, the function of transmission technique in order to obtain possessing complete collection fruit and high-efficient transportation fruit is merged into on the basis that the structure is as simple as possible, has simple structure, economy, practicality and efficient characteristics to certain market value has.

An alternating high-altitude picking and collecting device comprises a shearing mechanism and a conveying mechanism, wherein the shearing mechanism comprises scissors, a handle and a transmission assembly, the scissors and the handle are respectively fixed at two ends of the transmission assembly, and the handle can control the scissors to carry out shearing operation through the transmission assembly; the conveying mechanism comprises a support, a moving assembly and two net bags, the moving assembly comprises two pulleys fixed with the support and a synchronous belt sleeved on the two pulleys, the two net bags are connected to the synchronous belt and are configured to be lifted when one net bag descends, and the support is sleeved on the transmission assembly to enable the conveying mechanism to rotate relative to the shearing mechanism and move along the length direction.

Furthermore, the transmission assembly comprises a first connecting rod, a second connecting rod, a first connecting pipe and a second connecting pipe, the first connecting pipe is sleeved on the first connecting rod, the second connecting pipe is sleeved on the second connecting rod, the first connecting pipe and the first connecting rod are partially inserted into the second connecting pipe, an adjusting assembly used for adjusting the length of the first connecting pipe and the length of the first connecting rod extending into the second connecting pipe are arranged on the first connecting pipe, and the first connecting rod and the second connecting rod are in transmission connection through the adjusting assembly.

Furthermore, the adjusting component comprises a sliding block hinged to the front end of the second connecting rod, a locking piece hinged to the sliding block, a button assembled on the second connecting pipe and a pressing pin connected with the button, the first connecting rod is inserted between the sliding block and the locking piece, a first torsion spring is installed at the bottom of the locking piece, the first torsion spring provides thrust for the locking piece to enable the locking piece to be far away from the first connecting rod, a plurality of grooves are formed in the first connecting rod in the length direction, a plurality of first limiting holes corresponding to the grooves of the first connecting rod are formed in the first connecting pipe, the pressing pin is opposite to the first connecting rod, a second torsion spring is arranged at the bottom of the button, under the condition that external force is not applied, the front end of the button descends through the second torsion spring, the pressing pin is inserted into the grooves of the first connecting rod after passing through the first limiting holes, and the length of the transmission component can be adjusted by inserting the locking piece.

Further, the scissors comprise a movable blade and a fixed blade, the movable blade is hinged with the fixed blade, the fixed blade is fixedly connected with a first connecting pipe, a waist-shaped hole is formed in the fixed blade, the movable blade is connected with the first connecting rod through a rotating shaft, and the rotating shaft is inserted into the waist-shaped hole in the fixed blade; the handle comprises a movable handle and a fixed handle, the movable handle is hinged with the fixed handle, and the movable handle is connected with the second connecting rod.

Furthermore, the support comprises a first end block, a second end block and a plurality of support rods for connecting the first end block and the second end block, the first end block and the second end block are provided with through holes, and the first end block and the second end block are sleeved on a transmission assembly of the shearing mechanism through the through holes so that the support can rotate relative to the transmission assembly.

Furthermore, the first end block and the second end block are both provided with pulley seats, the two pulley seats are opposite, two ends of a central shaft of each pulley are sleeved with bearings, and the two pulleys are respectively arranged on the two pulley seats through the bearings.

Furthermore, the net bag is provided with a ferrule, the ferrule is fixedly connected with the synchronous belt, and the ferrule is parallel to the length direction of the support.

Further, be equipped with braking component on the transport mechanism, braking component includes brake round pin, spring and spring holder, spring holder fixed connection is equipped with the spout in the one end that is close to the handle of support on the spring holder, and during the spout was arranged in to spring and brake round pin, the brake round pin was relative with a pulley in the removal subassembly, and the brake round pin withstands this pulley so that the removal subassembly braking under the effect of spring, stirs the brake round pin and can relieve the brake state who removes the subassembly.

Compared with the prior art, the utility model has the advantages of it is following:

(1) compare in the characteristics that collection device only noted integrality in traditional high altitude, transport mechanism can cut the mechanism rotation relatively and remove along length direction, cuts except coaxial between mechanism and the transport mechanism, does not have other restraint, has guaranteed sufficient degree of freedom, and operating personnel can find suitable angle always and make the string bag be located the scissors below in order to catch target fruit.

(2) Transport mechanism adopts alternate transportation structure, replaces the motor transportation with the gravity transportation, after gathering target object article, utilizes gravity to realize reciprocating transport, improves and gathers collection efficiency, uses manpower sparingly, has simple structure, economy, practicality, high efficiency and simple characteristics of generally fitting, simplifies and gathers the action, guarantees to wait to gather that article are complete, has certain market value.

(3) The alternating high-altitude picking collecting device has scalability by assisting the adjusting component, so that the alternating high-altitude picking collecting device can adapt to different environments.

(4) Be equipped with braking component on the transport mechanism, improve the security performance, operating personnel stirs the brake pin gently, makes the hold-in range can normally slide, and the string bag falls off successfully, and simultaneously, another string bag rises and is in the operating condition, and the integrality and the collection efficiency of waiting to gather high altitude article have been guaranteed to this circulation reciprocal.

Drawings

Fig. 1 is an alternative high-altitude picking and collecting device according to an embodiment of the present invention;

fig. 2 is a broken away view of the alternate high altitude picking collection device of an embodiment of the present invention;

fig. 3 is an exploded view of a transport mechanism according to an embodiment of the present invention;

fig. 4 is a split view of a shearing mechanism of an embodiment of the present invention;

fig. 5 is a perspective view of a slider according to an embodiment of the present invention;

fig. 6 is a perspective view of a button seat according to an embodiment of the present invention;

figure 7 is a perspective view of an adjustment assembly in accordance with an embodiment of the present invention;

fig. 8 is an exploded view of an adjustment assembly in accordance with an embodiment of the present invention.

Detailed Description

The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the interconnection of two elements or through the interaction of two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

As shown in fig. 1 and fig. 2, the present embodiment discloses an alternating high-altitude picking and collecting device, which includes a shearing mechanism 1 and a transporting mechanism 2, wherein the shearing mechanism 1 includes scissors 101, a handle 102 and a transmission assembly 103, the scissors 101 and the handle 102 are respectively fixed at two ends of the transmission assembly 103, and the handle 102 can control the scissors 101 to perform shearing operation through the transmission assembly 103; the transportation mechanism 2 comprises a support 201, a moving assembly 202 and two net bags 203, wherein the moving assembly 202 comprises two pulleys fixed with the support 201 and a synchronous belt 2021 sleeved on the two pulleys, the two net bags 203 are connected to the synchronous belt 2021 and configured to enable one net bag 203 to ascend when the other net bag 203 descends, and the support 201 is sleeved on the transmission assembly 103 so that the transportation mechanism 2 can rotate relative to the shearing mechanism 1 and can move along the length direction.

The fruit should be transported with the mesh bag 203 kept relatively still and the fruits should be kept relatively still as much as possible, especially for juicy and easily damaged fruits, and the damage of the fruits in the mesh bag 203 due to collision and rolling should be avoided as much as possible. The transport mechanism 2 in this embodiment adopts an alternate transport structure, the two tuck nets 203 exchange front and back positions through the pulleys and the synchronous belt 2021, when the fruit falls into the tuck net 203 at a high position, due to the gravity, the total weight of the tuck net 203 and the fruit is larger than the empty tuck net 203 at the lower part, the tuck net 203 at the high position slides down to a low position, in the sliding down process, the tuck net 203 at the low position originally moves to the high position along with the synchronous belt 2021, at this moment, the fruit in the tuck net 203 at the low position can be taken out and picked by the next wheel, the reciprocating transportation is realized by utilizing the gravity, and the picking and collecting efficiency is improved. The transportation mechanism 2 of the alternate high-altitude picking and collecting device does not need to be provided with a power conveyer such as a servo motor and the like, so that the alternate high-altitude picking and collecting device is more portable and easy to operate.

In a specific structure, as shown in fig. 3, the support 201 includes a first end block 2011, a second end block 2012 and a plurality of support rods 2013 connecting the first end block 2011 and the second end block 2012, the first end block 2011 and the second end block 2012 are both provided with through holes, and the first end block 2011 and the second end block 2012 are sleeved on the transmission assembly 103 of the cutting mechanism 1 through the through holes so that the support 201 can rotate relative to the transmission assembly 103. All be equipped with pulley holder 2014 on first end block 2011 and the second end block 2012, two pulley holders 2014 are relative, and pulley holder 2014 includes two relative installation pieces, and the installation piece is fixed with first end block 2011 or second end block 2012 through modes such as threaded connection, welding, is equipped with the bearing mounting hole on the installation piece. The center pin both ends of pulley all overlap there is the bearing, and the bearing inlays in the bearing mounting hole, and two pulleys are installed respectively on two pulley seats 2014 by the bearing. The synchronous belt 2021 is sleeved on the two pulleys, the net bag 203 is provided with a ferrule, the ferrule is fixedly connected with the synchronous belt 2021, and the ferrule is parallel to the length direction of the bracket 201.

Because the fruit positions are irregularly distributed, the cutting angle of an operator is irregular, in the embodiment, the support 201 is sleeved on the transmission assembly 103 so that the transportation mechanism 2 can rotate and slide relative to the cutting mechanism 1, the transportation mechanism 2 and the cutting mechanism 1 still keep enough freedom degree under certain constraint, mutual limitation of the transportation mechanism 2 and the cutting mechanism 1 is avoided, and the net bag 203 for transporting the fruits can move to the lower part of the scissors 101 under any posture.

In order to ensure the control stability and safety of the device, the transport mechanism 2 is provided with a brake assembly 204. As shown in fig. 3, the braking assembly 204 includes a braking pin 2041, a spring 2042, and a spring seat 2043, the spring seat 2043 is fixedly connected to one end of the support 201 close to the handle 102, specifically, the spring seat 2043 is fixed to one side of the second end block 2012 close to the handle 102, a sliding slot is formed on the spring seat 2043, the spring 2042 and the braking pin 2041 are disposed in the sliding slot, one end of the spring 2042 abuts against an end of the sliding slot, and the other end abuts against the braking pin 2041, a through hole for the braking pin 2041 to pass through is formed on the second end block 2012, the braking pin 2041 is opposite to one pulley in the moving assembly 202, under the condition of no external force, the braking pin 2041 abuts against the pulley under the action of the spring 2042 to brake the moving assembly 202, and the braking pin 2041 can release the braking state of.

In a normal state, the spring 2042 provides a pushing force against the brake pin 2041, so that the brake pin 2041 and the pulley are pressed to prevent the pulley from rotating, and the transportation mechanism 2 is kept in a braking state under the action of the spring 2042 and the brake pin 2041. During the use, look for suitable angle and distance and aim at the high altitude article that the collection device was picked in the alternative high altitude to treat, cut end fruit branch, make the fruit fall into string bag 203, operating personnel holds handle 102 in one hand, the brake pin 2041 is slightly pulled in the other hand in order to relieve the brake state, make hold-in range 2021 can normally slide, string bag 203 that is in the high position moves down so that operating personnel takes out the fruit by oneself under the action of gravity of fruit and string bag 203, simultaneously, another string bag 203 rises and is in the operating condition, loosen brake pin 2041 and resume the braking, carry out the picking of next round, so the circulation is reciprocal, the integrality and the higher picking efficiency of waiting to pick high altitude fruit have been guaranteed.

Preferably, a handle is disposed on a side of the second end block 2012 facing the handle 102, the brake assembly 204 is mounted on the handle, the handle is sleeved on the transmission assembly 103, and the operator rotates the handle to rotate the bracket 201. The handle is in a circular tube shape, so that an operator can conveniently rotate the handle.

In the present embodiment, as shown in fig. 2, the handle 102 includes a movable handle 1021 and a fixed handle 1022, the movable handle 1021 and the fixed handle 1022 are connected by a hinge shaft, the scissors 101 includes a movable blade 1011 and a fixed blade 1012, and the movable blade 1011 and the fixed blade 1012 are connected by a hinge shaft. The driving unit 103 is used to transmit the movement of the movable handle 1021 to the movable blade 1011, so it is considered that the driving unit 103 is configured as a long rod having two ends connected to the movable blade 1011 and the movable handle 1021, respectively. If the transmission assembly 103 is a long rod, the length of the transmission assembly 103 is not adjustable.

Due to the different heights of the plants, the fruit is unevenly distributed, and in order to adapt to picking operations at different heights, the transmission assembly 103 is preferably arranged to be a telescopic structure in the embodiment. Specifically, as shown in fig. 4, the transmission assembly 103 includes a first connection pipe 1031, a second connection pipe 1032, a first connection pipe 1033, and a second connection pipe 1034, the first connection pipe 1033 is sleeved on the first connection pipe 1031, the second connection pipe 1034 is sleeved on the second connection pipe 1032, the first connection pipe 1033 and the first connection pipe 1031 are both partially inserted into the second connection pipe 1034, an adjustment assembly 1035 for adjusting the length of the first connection pipe 1033 and the first connection pipe 1031 extending into the second connection pipe 1034 is disposed on the first connection pipe 1033, and the first connection pipe 1031 and the second connection pipe 1032 are in transmission connection through the adjustment assembly 1035.

As shown in fig. 7 and 8, the adjustment assembly 1035 includes a slider 10351 hingedly connected to the front end of the second link 1032, a latch member 10352 hingedly connected to the slider 10351, a button 10353 assembled on the second connection pipe 1034, and a pressing pin 10354 connected to the button 10353, the slider 10351 and the latch member 10352 being located in the second connection pipe 1034, and the first link 1031 being inserted between the slider 10351 and the latch member 10352. A first torsion spring 10355 is mounted on the bottom of the locking member 10352, and the first torsion spring 10355 provides a pushing force to the locking member 10352 to push the locking member 10352 away from the first link 1031. The first connecting rod 1031 is provided with a plurality of grooves 10311 along the length direction, and the first connecting pipe 1033 is provided with a plurality of first limiting holes corresponding to the grooves 10311 of the first connecting rod 1031. The pressing pin 10354 is opposite to the first link 1031. The button 10353 is provided with a second torsion spring 10356 at the bottom, and under the condition of no external force, the second torsion spring 10356 lowers the front end of the button 10353, so that the pressing pin 10354 passes through the first limiting hole and then is inserted into the groove 10311 of the first link 1031, and the length of the transmission component 103 can be adjusted by inserting the locking piece 10352 into different grooves 10311.

In a more specific structure, as shown in fig. 5, a cavity is formed inside the slider 10351, a first positioning pin 103511, a second positioning pin 103512 and a third positioning pin 103513 are assembled in the cavity, the first connecting rod 1031 longitudinally penetrates through the cavity, the first connecting rod 1031 abuts against the three positioning pins, a positioning pin mounting hole is formed at the rear end of the locking element 10352, the third positioning pin 103513 penetrates through the positioning pin mounting hole of the locking element 10352, and the locking element 10352 is hinged to the slider 10351 through the third positioning pin 103513. A first torsion spring 10355 is assembled to the second positioning pin 103512, and the first torsion spring 10355 abuts the bottom wall of the cavity at one end and the bottom of the locking member 10352 at the other end. As shown in fig. 4 and 6, a button seat 10357 is fixedly sleeved on the second connecting tube 1034, the button 10353 is hinged to the button seat 10357 through a hinge shaft, the second torsion spring 10356 is sleeved on the hinge shaft, the second torsion spring 10356 is located below the button 10353, under the action of the second torsion spring 10356, the front end of the button 10353 descends and drives the pressing pin 10354 to press the locking member 10352 downwards, so that the locking member 10352 is inserted into the groove 10311 of the first connecting rod 1031.

In the present embodiment, the fixed handle 1022 in the handle 102 is fixedly connected to the second connecting pipe 1034, and the movable handle 1021 is connected to the second link 1032. The fixed blade 1012 of the scissors 101 is fixedly connected with the first connecting pipe 1033, the fixed blade 1012 is provided with a waist-shaped hole, the movable blade 1011 and the first connecting rod 1031 are connected through a rotating shaft, the rotating shaft is inserted into the waist-shaped hole on the fixed blade 1012, the handle 102 is held, the movable handle 1021 rotates relative to the fixed handle 1022, and then the movable blade 1011 of the scissors 101 rotates relative to the fixed blade 1012, so that the shearing action is generated. The handle 102 and the cutter head are connected through a transmission assembly 103, so that force transmission is realized. When cutting, the operator can hold the handle 102 with one hand and the transport mechanism 2 with the other hand, and the handle 102 can be rotated at least 180 ° relative to the transport mechanism 2 to match different hand movements.

Compared with the characteristic that the traditional high-altitude picking device only focuses on integrity, the alternating high-altitude picking collecting device provided by the embodiment can ensure the scalability of the shearing mechanism 1 by the aid of the transmission assembly 103, and meanwhile, the shearing mechanism 1 and the conveying mechanism 2 are coaxial without other constraints, so that the sufficient degree of freedom is ensured. The two characteristics enable the alternating high-altitude picking and collecting device to be suitable for different environments, and operators can always find out proper angles and distances to operate.

The alternating high-altitude picking and collecting device needs manpower to support when working, needs to face complex environments, and is high in degree of freedom and good in adaptability. For the sake of portability, there is a certain demand for materials, and for parts requiring relatively high rigidity, such as the shearing mechanism 1 and the holder 201, steel materials or composite materials are preferably used, and for example, light steel materials such as aluminum alloy can be used. For small parts with low requirements on rigidity and toughness, such as pulleys, nylon materials can be adopted. Thus, the weight of the whole device is limited to a certain range, and portability is realized. The alternating high-altitude picking and collecting device has the characteristics of simple structure, economy, practicability and high efficiency, and has certain market value.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The utility model provides a collection device is picked in alternating high altitude which characterized in that: the shearing mechanism comprises scissors, a handle and a transmission assembly, wherein the scissors and the handle are respectively fixed at two ends of the transmission assembly, and the handle can control the scissors to carry out shearing operation through the transmission assembly; the conveying mechanism comprises a support, a moving assembly and two net bags, the moving assembly comprises two pulleys fixed with the support and a synchronous belt sleeved on the two pulleys, the two net bags are connected to the synchronous belt and are configured to be lifted when one net bag descends, and the support is sleeved on the transmission assembly to enable the conveying mechanism to rotate relative to the shearing mechanism and move along the length direction of the shearing mechanism.

2. The alternating high altitude picking and collecting device according to claim 1, wherein the transmission assembly comprises a first connecting rod, a second connecting rod, a first connecting pipe and a second connecting pipe, the first connecting pipe is sleeved on the first connecting rod, the second connecting pipe is sleeved on the second connecting rod, the first connecting pipe and the first connecting rod are both partially inserted into the second connecting pipe, the first connecting pipe is provided with an adjusting assembly for adjusting the length of the first connecting pipe and the first connecting rod extending into the second connecting pipe, and the first connecting rod and the second connecting rod are in transmission connection through the adjusting assembly.

3. The alternating high altitude picking and collecting device according to claim 2, wherein the adjusting assembly comprises a slider hinged to the front end of the second connecting rod, a locking member hinged to the slider, a button assembled outside the second connecting rod, and a pressing pin connected to the button, the slider and the locking member are located in the second connecting pipe, the first connecting rod is inserted between the slider and the locking member, the first torsion spring is installed at the bottom of the locking member, the first torsion spring provides the locking member with a pushing force to keep the locking member away from the first connecting rod, the first connecting rod is provided with a plurality of grooves along the length direction, the first connecting pipe is provided with a plurality of first limiting holes corresponding to the grooves of the first connecting rod, the pressing pin is opposite to the first connecting rod, the second connecting pipe is provided with a second limiting hole for the pressing pin to pass through, the bottom of the button is provided with a second torsion spring, the second torsion spring lowers the front end of the button without being subjected to an external force, so that the pressing pin passes through the first limiting hole and the second limiting hole and then is inserted into the groove of the first connecting rod, and the length of the transmission assembly can be adjusted by inserting the locking piece into different grooves.

4. The alternating high-altitude picking and collecting device according to claim 2, wherein the scissors comprise a movable blade and a fixed blade, the movable blade is hinged with the fixed blade, the fixed blade is fixedly connected with the first connecting pipe, the fixed blade is provided with a waist-shaped hole, the movable blade is connected with the first connecting rod through a rotating shaft, and the rotating shaft is inserted into the waist-shaped hole on the fixed blade; the handle comprises a movable handle and a fixed handle, the movable handle is hinged with the fixed handle, and the movable handle is connected with the second connecting rod.

5. The alternating high altitude picking and collecting device of claim 1, wherein the bracket comprises a first end block, a second end block and a plurality of support rods connecting the first end block and the second end block, the first end block and the second end block are provided with through holes, and the first end block and the second end block are sleeved on the transmission assembly of the shearing mechanism through the through holes so that the bracket can rotate relative to the transmission assembly.

6. The alternating high-altitude picking and collecting device as claimed in claim 5, wherein the first end block and the second end block are provided with pulley seats, the two pulley seats are opposite, two ends of a central shaft of each pulley are sleeved with bearings, and the two pulleys are respectively mounted on the two pulley seats through the bearings.

7. The alternating high-altitude picking and collecting device as claimed in claim 1, wherein the tuck net is provided with a ferrule, the ferrule is fixedly connected with the synchronous belt, and the ferrule is parallel to the length direction of the bracket.

8. The alternating high-altitude picking and collecting device according to claim 1, wherein the transportation mechanism is provided with a brake assembly, the brake assembly comprises a brake pin, a spring and a spring seat, the spring seat is fixedly connected to one end of the support close to the handle, the spring seat is provided with a sliding groove, the spring and the brake pin are arranged in the sliding groove, the brake pin is opposite to one pulley in the moving assembly, the brake pin abuts against the pulley under the action of the spring to brake the moving assembly, and the brake pin can be pulled to release the braking state of the moving assembly.