Adjustable ladder stand for a truss

Abstract

The application discloses a kind of adjustable cat ladder for truss, including the climbing part for personnel to climb, climbing part includes two mutually parallel support tubes, several fixedly connected footboards between support tube, two mutually parallel adjusting rods, the upper end of adjusting rod is fixedly connected by connecting rod and the upper end of another adjusting rod, the upper end of adjusting rod is fixedly connected with the first hook for cooperating with upper chord, the lower end of support tube is fixedly connected with the second hook for cooperating with lower chord, the upper end of adjusting rod is provided with first working platform, the lower end of support tube is provided with second working platform, the side of adjusting rod close to another adjusting rod is provided with several accommodating grooves, rotating plate is arranged in accommodating groove, rotating plate includes the footboard arranged in the upper side of pivot, the limiting portion arranged in the lower side of pivot, the lower end of accommodating groove is provided with avoiding slot, the lower end of rotating plate is provided with connecting hole.The application can adjust length.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of truss butt joint, and particularly relates to an adjustable ladder stand for truss. BACKGROUND

[0002] When two trusses are butt jointed in the air, a ladder stand needs to be arranged at the end of the truss, and then personnel stand on the ladder stand and are lifted to the air along with the truss, and the personnel need to connect the two end trusses together through bolts or welding. The upper end of the existing ladder stand is connected with the upper chord of the truss, and the lower end of the ladder stand is connected with the lower chord of the truss, so that the personnel can move along the ladder stand between the upper chord and the lower chord, and then the personnel can connect the two end trusses together along the ladder stand. The existing ladder stand cannot be adjusted in length, that is, when the distance between the upper chord and the lower chord of the truss changes, the ladder stand needs to be redesigned and manufactured, which is time-consuming and laborious. SUMMARY

[0003] The present application is proposed to solve the problem that the existing ladder stand cannot be adjusted in length, and provides an adjustable ladder stand for truss, which can be adjusted in length and adapt to different distances between the upper chord and the lower chord.

[0004] To achieve the above-mentioned purpose, the present application adopts the following technical scheme:

[0005] An adjustable ladder stand for truss comprises a ladder climbing part for personnel to climb, the ladder climbing part comprises two mutually parallel support pipes, a plurality of footboards fixedly connected between the support pipes, and two mutually parallel adjusting rods, the footboards are arranged in sequence along the extension direction of the support pipes, the adjusting rods are in one-to-one correspondence with the support pipes, the lower end of the adjusting rod is inserted into the corresponding support pipe and is in sliding connection with the support pipe, the upper end of the adjusting rod is fixedly connected with the upper end of the other adjusting rod through a connecting rod, the upper end of the adjusting rod is fixedly connected with a first hook for cooperation with the upper chord, the lower end of the support pipe is fixedly connected with a second hook for cooperation with the lower chord, the upper end of the adjusting rod is provided with a first working platform, the lower end of the support pipe is provided with a second working platform, one side of the adjusting rod close to the other adjusting rod is provided with a plurality of accommodating grooves arranged in sequence along the extension direction of the adjusting rod, a rotating plate is arranged in the accommodating groove, the lower end of the rotating plate is rotatably connected with the adjusting rod through a rotating shaft, the rotating plate comprises a footboard arranged on the upper side of the rotating shaft and a limiting part arranged on the lower side of the rotating shaft, the lower end of the accommodating groove is provided with an avoiding groove for avoiding the limiting part, and the lower end of the rotating plate is provided with a connecting hole for fixedly connecting the rotating plate and the upper end of the support pipe through a bolt.

[0006] By the above arrangement, the length can be adjusted and adapted to the different distance between the upper chord and the lower chord. The support pipe is used to mount the foot plates, which are arranged along the support pipe in sequence, so that the personnel can climb up and down along the foot plates. The adjusting rods can slide up and down along the support pipe, so as to realize the length adjustment of the present application. The connecting rod is used to fixedly connect the two adjusting rods together, and also plays a role in protecting the personnel. The first hook is used to hook with the upper chord, so as to realize the connection between the upper chord and the adjusting rod. The second hook is used to hook with the lower chord, so as to realize the connection between the lower chord and the support pipe. At this time, the truss is lifted, and the present application moves together with the truss. The accommodating groove is used to accommodate the rotating plate. When the rotating plate is located in the accommodating groove, the adjusting rod can slide up and down along the support pipe, so as to realize the length adjustment of the present application, so as to adapt to different specifications of the truss. When the adjusting rod slides up along the support pipe, the rotating plate is away from the support pipe, and the rotating plate rotates by 90 degrees. At this time, the foot plate is horizontal, the limiting part passes through the avoiding groove, the upper side of the rotating plate of the support pipe abuts against the upper end of the support pipe, and the rotating plate and the support pipe are fixedly connected through the bolt passing through the connecting hole, so as to fix the relative position of the adjusting rod and the support pipe, that is, the length of the present application is fixed. The first working platform and the second working platform can be used for the personnel to stand and work. The first working platform and the second working platform have a relatively spacious area, which is convenient for the personnel to butt joint the truss. Correspondingly, the second working platform can climb to the first working platform along the foot plate and the foot plate.

[0007] Further, the upper end of the accommodating groove is provided with a first magnet for adsorbing the foot plate to make the rotating plate located in the accommodating groove. The upper side of the avoiding groove is provided with a second magnet for adsorbing the limiting part to make the rotating plate extend along the horizontal direction.

[0008] Further, the first working platform comprises a first bottom plate fixedly connected with the adjusting rod, a plurality of first railings in arc shape arranged above the first bottom plate, one end of the first railing is fixedly connected with one of the adjusting rods, and the other end of the first railing is fixedly connected with the other adjusting rod. The connecting rod, the first bottom plate and the first railing form a first working space for the personnel to work. The first bottom plate is provided with a through hole for the personnel to pass through. A flange is fixedly connected along the inner periphery of the through hole. A cover plate is arranged in the through hole. The cover plate abuts against the upper side of the flange. The cover plate is rotatably connected with the flange through a hinge.

[0009] Further, the second working platform comprises a second bottom plate fixedly connected with the lower end of the support pipe, a plurality of second railings in arc shape arranged above the second bottom plate, one end of the second railing is fixedly connected with one of the support pipes, and the other end of the second railing is fixedly connected with the other support pipe. The second bottom plate, the second railing and the foot plate form a second working space for the personnel to work.

[0010] Further, the first hook comprises a first support plate fixedly connected with the adjusting rod, and a first hook plate fixedly connected with the first support plate and extending downward.

[0011] Further, the first hook plate is screw-connected with a first bolt for abutting against the upper chord to prevent the first hook from being separated from the upper chord, and the second hook plate is screw-connected with a second bolt for abutting against the lower chord to prevent the second hook from being separated from the lower chord.

[0012] Further, a plurality of third railings in the shape of circular arc are arranged along the extending direction of the support pipes in sequence, one end of each of the third railings is fixedly connected with one of the support pipes, and the other end of each of the third railings is fixedly connected with another one of the support pipes, a climbing channel extending in the vertical direction is formed between the third railings, the foot plates and the support pipes, a reinforcing pipe extending in the vertical direction is fixedly connected with the outer side of each of the third railings, and a protection pipe is slidingly connected in the reinforcing pipe, and the upper end of the protection pipe is fixedly connected with the first bottom plate.

[0013] Further, the second bottom plate is provided with a winch, the winch is connected with a pull rope, the first bottom plate is provided with a first through hole and a second through hole, the first through hole is communicated with the protection pipe, the second through hole is located on the side of the first through hole away from the adjusting rod, the second bottom plate is provided with a third through hole, the upper side of the first bottom plate is rotatably connected with a first roller and a second roller, the first roller and the second roller are arranged between the first through hole and the second through hole, the pull rope passes through the third through hole, the support pipe, the protection pipe, the first through hole, the second through hole in sequence and is connected with a bucket, and the first roller and the second roller support the pull rope to reduce the movement resistance of the pull rope. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 is a schematic view of an embodiment.

[0015] Figure 2 is a schematic view of an embodiment. Figure 1 is an A-A sectional view of the embodiment.

[0016] Figure 3 is a B enlarged view of the embodiment. Figure 1

[0017] Figure 4 is a partial sectional view of the embodiment. Figure 3

[0018] is a sectional view of the climbing part. Figure 5

[0019] is a C enlarged view of the embodiment. Figure 6 Figure 5

[0020] Figure 7 ​​​A schematic view of the crawling part with increased length.

[0021] Figure 8 A Figure 7 An enlarged view of D. DETAILED DESCRIPTION

[0022] The technical solutions of the present application will be further described in detail below by way of examples in conjunction with the drawings.

[0023] Referring to Figures 1 to 8 An adjustable ladder for trusses, comprising a crawling part 11 for personnel to crawl, the crawling part 11 comprising two mutually parallel support tubes 111, a plurality of footboards 112 fixedly connected between the support tubes 111, and two mutually parallel adjusting rods 113, the footboards 112 being arranged in sequence along the extension direction of the support tubes 111, the adjusting rods 113 and the support tubes 111 corresponding one-to-one, the lower end of the adjusting rod 113 being inserted into the corresponding support tube 111 and being in sliding connection with the support tube 111, the upper end of the adjusting rod 113 being fixedly connected with the upper end of the other adjusting rod 113 through a connecting rod 23, the upper end of the adjusting rod 113 being fixedly connected with a first hook 114 for cooperating with an upper chord 21, the lower end of the support tube 111 being fixedly connected with a second hook 115 for cooperating with a lower chord 22, the upper end of the adjusting rod 113 being provided with a first working platform 116, the lower end of the support tube 111 being provided with a second working platform 117, the side of the adjusting rod 113 close to the other adjusting rod 113 being provided with a plurality of accommodating grooves 1131 arranged in sequence along the extension direction of the adjusting rod 113, the accommodating groove 1131 being provided with a rotating plate 1132, the lower end of the rotating plate 1132 being rotatably connected with the adjusting rod 113 through a rotating shaft 1133, the rotating plate 1132 comprising a footboard portion 11321 arranged on the upper side of the rotating shaft 1133 and a limiting portion 11322 arranged on the lower side of the rotating shaft 1133, the lower end of the accommodating groove 1131 being provided with an avoiding groove 11311 for avoiding the limiting portion 11322, the lower end of the rotating plate 1132 being provided with a connecting hole 11323 for fixedly connecting the rotating plate 1132 with the upper end of the support tube 111 through a bolt.

[0024] By the above setting, the length can be adjusted and adapted to the different distance between the upper chord 21 and the lower chord 22. The support pipe 111 is used to install the footboard 112, and the footboard 112 is arranged along the support pipe 111 in sequence, so that the personnel can climb up and down along the footboard 112, and the adjusting rod 113 can slide up and down along the support pipe 111, so as to realize the length adjustment of the present application. The connecting rod is fixedly connected with the two adjusting rods 113, and in addition, the connecting rod also plays a role in protecting the personnel. The first hook 114 is used to hook with the upper chord 21, so as to realize the connection between the upper chord 21 and the adjusting rod 113. The second hook 115 is used to hook with the lower chord 22, so as to realize the connection between the lower chord 22 and the support pipe 111. See Figure 1 At this time, the truss is in the process of being lifted, and the present application moves together with the truss. The accommodating groove 1131 is used to accommodate the rotating plate 1132. When the rotating plate 1132 is located in the accommodating groove 1131, see Figure 5 and Figure 6 The adjusting rod 113 can slide up and down along the support pipe 111, so as to realize the length adjustment of the present application to adapt to different specifications of the truss. When the adjusting rod 113 slides upward along the support pipe 111, the rotating plate 1132 is away from the support pipe 111, and the rotating plate 1132 rotates by ninety degrees. See Figure 7 and Figure 8 At this time, the footboard 11321 is along the horizontal, the limiting part 11322 passes through the avoiding groove 11311, the upper side of the rotating plate 1132 of the support pipe 111 abuts against the upper end of the support pipe 111, and the rotating plate 1132 and the support pipe 111 are fixedly connected through the bolt passing through the connecting hole 11323, so as to fix the relative position of the adjusting rod 113 and the support pipe 111, that is, to fix the length of the present application. The first working platform 116 and the second working platform 117 can be used for personnel to stand and work. The first working platform 116 and the second working platform 117 have a relatively spacious area, which is convenient for personnel to butt joint the truss. Correspondingly, the second working platform 117 can climb to the first working platform 116 along the footboard 112 and the footboard 11321.

[0025] As an implementation manner, the upper end of the accommodating groove 1131 is provided with a first magnet 11312 for adsorbing the footboard 11321 so that the rotating plate 1132 is located in the accommodating groove 1131. The upper side of the avoiding groove 11311 is provided with a second magnet 11313 for adsorbing the limiting part 11322 so that the rotating plate 1132 extends along the horizontal.

[0026] By the above setting, see Figure 6When the footboard 11321 and the first magnet 11312 abut, the rotating plate 1132 is kept in the accommodating groove 1131, so as to facilitate the sliding of the adjusting rod 113 into the adjusting pipe, that is, to facilitate the shortening of the application. When the rotating plate 1132 is rotated to be horizontal, referring to Figure 8 The limiting part 11322 is attracted by the second magnet 11313 at this time. When a person steps on the footboard 11321, the limiting part 11322 is supported by the second magnet 11313, and the footboard 11321 can stably support the person. The footboard 11321 will not be stepped down. In addition, the arrangement of the second magnet 11313 also prevents the rotating plate 1132 from being easily rotated when the application is in use, thereby improving the stability of the application.

[0027] As an implementation manner, the first working platform 116 comprises a first bottom plate 1161 fixedly connected with the adjusting rod 113, a plurality of first railings 1162 in the shape of a circular arc arranged above the first bottom plate 1161, one end of the first railing 1162 being fixedly connected with one of the adjusting rods 113, and the other end of the first railing 1162 being fixedly connected with the other adjusting rod 113. A first working space for a person to work is formed between the connecting rod, the first bottom plate 1161 and the first railing 1162. The first bottom plate 1161 is provided with a through hole 11611 for a person to walk through, a flange 11612 is fixedly connected along the inner periphery of the through hole 11611, a cover plate 11613 is arranged in the through hole 11611, the cover plate 11613 abuts against the upper side of the flange 11612, and the cover plate 11613 is rotationally connected to the flange 11612 through a hinge 11614 on one side.

[0028] Through the above arrangement, the first bottom plate 1161 is stepped on by a person, and the first guardrail prevents the person on the first bottom plate 1161 from falling off the edge of the first bottom plate 1161, thereby improving the safety of the person working in the first working space. The cover plate 11613 can also be stepped on by the person working in the first working space. The cover plate 11613 is used to block the through hole 11611, and the flange 11612 supports the cover plate 11613 to prevent the cover plate 11613 from being stepped down. When a person needs to climb from the first working platform 116 to the second working platform 117, the person rotates the cover plate 11613 upward to expose the through hole 11611, and then passes through the through hole 11611 to leave the first working platform 116 and climb to the second working platform 117 along the rotating plate 1132 and the footboard 112. In addition, when a person needs to climb from the second working platform 117 to the first working platform 116, the person climbs upward through the footboard 112 and the rotating plate 1132, then rotates the cover plate 11613 upward to expose the through hole 11611, then passes through the through hole 11611 to enter the first working platform 116, and finally covers the cover plate 11613 again.

[0029] As an implementation form, the second working platform 117 comprises a second bottom plate 1171 fixedly connected with the lower end of the support pipe 111, and a plurality of second guardrails 1172 in the shape of a circular arc arranged above the second bottom plate 1171, one end of each of the second guardrails 1172 being fixedly connected with one of the support pipes 111, and the other end of each of the second guardrails 1172 being fixedly connected with another support pipe 111, so as to form a second working space between the second bottom plate 1171, the second guardrails 1172 and the foot plate 112 for personnel to work.

[0030] Through the above arrangement, the second bottom plate 1171 is used for personnel to step on, and the second guardrails 1172 prevent personnel from falling off the edge of the second bottom plate 1171, thereby improving the safety of personnel working in the second working space.

[0031] As an implementation form, the first hook 114 comprises a first support plate 1141 fixedly connected with the adjusting rod 113, and a first hook plate 1142 fixedly connected with the side of the first support plate 1141 away from the adjusting rod 113 and extending downward, and the second hook 115 comprises a second support plate 1151 fixedly connected with the support pipe 111, and a second hook plate 1152 fixedly connected with the side of the second support plate 1151 away from the support pipe 111 and extending downward.

[0032] Through the above arrangement, when the first hook 114 cooperates with the upper chord 21, the upper chord 21 is located between the first hook plate 1142 and the adjusting rod 113, and the first support plate 1141 is attached to the upper side of the upper chord 21, as shown in Figure 1 When the second hook 115 cooperates with the lower chord 22, the lower chord 22 is located between the second hook plate 1152 and the support pipe 111, and the second support plate 1151 is attached to the upper side of the lower chord 22, as shown in Figure 1 The distance between the first hook plate 1142 and the adjusting rod 113 is adapted to the width of the upper chord 21, so that the stability between the first hook 114 and the upper chord 21 is good, and the distance between the second hook plate 1152 and the support pipe 111 is adapted to the width of the lower chord 22, so that the stability of the connection between the second hook 115 and the lower chord 22 is better.

[0033] As an implementation form, the first hook plate 1142 is screw-connected with a first bolt 11421 used for abutting against the upper chord 21 to prevent the first hook 114 and the upper chord 21 from being disengaged, and the second hook plate 1152 is screw-connected with a second bolt 11521 used for abutting against the lower chord 22 to prevent the second hook 115 and the lower chord 22 from being disengaged.

[0034] As an implementation form, a plurality of third railings 1111 in circular arc shape are arranged in sequence along the extending direction of the support tubes 111, one end of the third railings 1111 is fixedly connected with one of the support tubes 111, the other end of the third railings 1111 is fixedly connected with another support tube 111, the third railings 1111, the footboards 112 and the support tubes 111 form a climbing channel extending in the vertical direction, the outer side of the third railings 1111 is fixedly connected with a reinforcing tube 1112 extending in the vertical direction, the reinforcing tube 1112 is slidably connected with a protective tube 11121, the upper end of the protective tube 11121 is fixedly connected with the first bottom plate 1161.

[0035] Through the above arrangement, the personnel is safer when climbing along the climbing part 11. Specifically, when the personnel is climbing, the personnel is located in the climbing channel and is surrounded by the footboards 112 and the third railings 1111, so that the personnel is safer. In addition, the arrangement of the reinforcing tube 1112 improves the stability of the third railings 1111, and when the personnel climbs along the adjusting rod 113 by rotating the plate 1132, the protective tube 11121 is on the back of the personnel and protects the personnel.

[0036] As an implementation form, the lower side of the second bottom plate 1171 is provided with a winch 1173, the winch 1173 is connected with a pull rope 1174, the first bottom plate 1161 is provided with a first perforation 11615 and a second perforation 11616, the first perforation 11615 is in communication with the protective tube 11121, the second perforation 11616 is located on the side of the first perforation 11615 away from the adjusting rod 113, the second bottom plate 1171 is provided with a third perforation 11711, the upper side of the first bottom plate 1161 is rotatably connected with a first roller 1163 and a second roller 1164, the first roller 1163 and the second roller 1164 are arranged between the first perforation 11615 and the second perforation 11616, the pull rope 1174 passes through the third perforation 11711, the support tube 111, the protective tube 11121, the first perforation 11615, the second perforation 11616 in sequence and is connected with a bucket 11741, the first roller 1163 and the second roller 1164 support the pull rope 1174 to reduce the movement resistance of the pull rope 1174.

[0037] Through the above setting, the efficiency of the truss butt joint is improved. Specifically, there are personnel on the first working platform 116 and the second working platform 117. When the personnel on the second working platform 117 need to hand over tools to the personnel on the first working platform 116, the personnel can place the tools in the bucket 11741, and then the winch 1173 is operated and the pull rope 1174 is wound. The pull rope 1174 lifts the bucket 11741 upward. The bucket 11741 moves upward and approaches the first working platform 116. The personnel on the first working platform 116 take out the tools from the bucket 11741, without the need to climb down to the second working platform 117 to take the tools. Similarly, when the personnel on the first working platform 116 need to hand over tools to the personnel on the second working platform 117, the personnel place the tools in the bucket 11741. Then the winch 1173 releases the pull rope 1174. Under the action of the gravity of the bucket 11741 and the tools, the bucket 11741 moves downward and approaches the second working platform 117. The personnel on the second working platform 117 take out the tools from the bucket 11741, which is very convenient.

[0038] It should be understood that, for those skilled in the art, improvements or changes can be made according to the above description, and all these improvements and changes shall belong to the protection scope of the appended claims of the present application.

Claims

1. An adjustable ladder for a truss, characterized in that: The climbing part comprises two mutually parallel supporting tubes, a plurality of foot pedals fixedly connected between the supporting tubes, and two mutually parallel adjusting rods. The foot pedals are arranged in sequence along the extension direction of the supporting tubes. The adjusting rods correspond to the supporting tubes one by one. The lower ends of the adjusting rods are inserted into the corresponding supporting tubes and are slidably connected to the supporting tubes. The upper ends of the adjusting rods are fixedly connected to the upper ends of the other adjusting rods through the connecting rods. The upper ends of the adjusting rods are fixedly connected to a first hook for cooperating with an upper chord rod, and the lower ends of the supporting tubes are fixedly connected to a second hook for cooperating with a lower chord rod. A first working platform is provided at the upper end, and a second working platform is provided at the lower end of the support tube. A plurality of accommodating grooves are provided on the side of the adjusting rod close to the other adjusting rod, and the accommodating grooves are arranged in sequence along the extension direction of the adjusting rod. A rotating plate is provided in the accommodating groove, and the lower end of the rotating plate is rotatably connected to the adjusting rod through a rotating shaft. The rotating plate includes a foot pedal portion provided on the upper side of the rotating shaft and a limiting portion provided on the lower side of the rotating shaft. An avoidance groove for avoiding the limiting portion is provided at the lower end of the accommodating groove, and a connecting hole is provided at the lower end of the rotating plate so that the rotating plate and the upper end of the support tube can be fixedly connected by bolts.

2. The adjustable ladder for trusses according to claim 1, characterized in that: The upper end of the accommodating groove is provided with a first magnet for adsorbing the pedal part so that the rotating plate is located in the accommodating groove, and the upper side of the avoidance groove is provided with a second magnet for adsorbing the limiting part so that the rotating plate extends horizontally.

3. The adjustable ladder for trusses according to claim 1, characterized in that: The first working platform includes a first base plate fixedly connected to the adjusting rod, and a plurality of arc-shaped first railings arranged above the first base plate, one end of the first railing is fixedly connected to one of the adjusting rods, and the other end of the first railing is fixedly connected to another adjusting rod, and a first working space for personnel to work is formed between the connecting rod, the first base plate and the first railing, and the first base plate is provided with a through hole for personnel to pass through, and a flange is fixedly connected along the inner periphery of the through hole, and a cover plate is provided in the through hole, the cover plate abuts against the upper side of the flange, and one side of the cover plate is rotatably connected to the flange through a hinge.

4. The adjustable ladder for trusses according to claim 3, characterized in that: The second working platform includes a second base plate fixedly connected to the lower end of the support tube, and several arc-shaped second guardrails arranged above the second base plate. One end of the second guardrail is fixedly connected to one of the support tubes, and the other end of the second guardrail is fixedly connected to the other support tube. A second working space for personnel to work is formed between the second base plate, the second guardrail and the foot pedal.

5. The adjustable ladder for trusses according to claim 1, characterized in that: The first hook includes a first support plate fixedly connected to the adjusting rod, and a first hook plate extending downward is fixedly connected to the side of the first support plate away from the adjusting rod. The second hook includes a second support plate fixedly connected to the supporting tube, and a second hook plate extending downward is fixedly connected to the side of the second support plate away from the supporting tube.

6. The adjustable ladder for trusses according to claim 5, characterized in that: The first hook plate is threadedly connected to a first bolt for abutting the upper chord to prevent the first hook from being disengaged from the upper chord, and the second hook plate is threadedly connected to a second bolt for abutting the lower chord to prevent the second hook from being disengaged from the lower chord.

7. The adjustable ladder for trusses according to claim 4, characterized in that: A plurality of arc-shaped third railings are arranged in sequence along the extension direction of the support tube, one end of the third railing is fixedly connected to one of the support tubes, and the other end of the third railing is fixedly connected to another support tube. A crawling channel extending vertically is formed between the third railing, the foot pedal and the support tube, a reinforcing tube extending vertically is fixedly connected to the outer side of the third railing, a protective tube is slidably connected inside the reinforcing tube, and the upper end of the protective tube is fixedly connected to the first bottom plate.

8. The adjustable ladder for trusses according to claim 7, characterized in that: A winch is provided on the lower side of the second base plate, and the winch is connected to a pull rope. The first base plate is provided with a first through-hole and a second through-hole. The first through-hole is connected to the protective tube, and the second through-hole is located on the side of the first through-hole away from the adjusting rod. The second base plate is provided with a third through-hole. The upper side of the first base plate is rotatably connected with a first roller and a second roller. The first roller and the second roller are arranged between the first through-hole and the second through-hole. The pull rope passes through the third through-hole, the support tube, the protective tube, the first through-hole, the second through-hole in sequence and is connected to a bucket. The first roller and the second roller support the pull rope to reduce the movement resistance of the pull rope.

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