Counterweight bearing equipment

Abstract

This utility model discloses a counterweight support device, relating to the field of counterweight technology. The counterweight support device includes a support box and multiple abutment limiting structures. The technical solution of this utility model is to set multiple triple abutment limiting structures in the support box, with each abutting against the recess of the counterweight unit. The multiple abutment limiting structures are arranged around the counterweight unit, thereby restricting the counterweight unit within the support box. Furthermore, by adjusting the position of the adjusting unit on each abutment limiting structure, the center of gravity of the support box can be easily adjusted, ensuring the stability of the support box during use.

Description

Technical Field

[0001] This utility model relates to the field of counterweight technology, and in particular to a counterweight support device. Background Technology

[0002] When elevators use counterweights, they need a box to support the counterweights. However, elevator counterweights are usually cast in concrete. Since most counterweights are cast as a whole, they are large in size and mass and the mass is not uniform. When multiple counterweights are stacked in the box, it cannot be guaranteed that the center of the entire box is in the required position. At this time, if the position of the stacked counterweights is adjusted, it is inefficient and time-consuming due to the mass of the stacked counterweights. This increases the difficulty of fine-tuning the counterweights and is not conducive to adjusting the center of gravity of the box. Utility Model Content

[0003] The main purpose of this utility model is to propose a counterweight support device, which aims to facilitate the adjustment of the center of gravity of the box that supports the counterweight.

[0004] To achieve the above objectives, the counterweight bearing device proposed in this utility model includes:

[0005] A support box, which carries stacked counterweight units;

[0006] Multiple abutment limiting structures are arranged around the counterweight unit, and the abutment limiting structures abut against the concave part of the counterweight unit;

[0007] The abutment limiting structure includes an adjustment unit that slides within it. After the multiple adjustment units move a preset distance away from the counterweight unit, the adjustment unit is fixed within the abutment limiting structure to adjust the center of gravity balance of the load-bearing box.

[0008] In one embodiment, the abutment limiting structure includes a first abutment portion and a second abutment portion. The first abutment portion is slidably connected to the bearing box and abuts against the concave side of the counterweight unit. The first extension end of the second abutment portion is inserted into the first abutment portion, and the second abutment portion abuts against the concave side of the counterweight unit.

[0009] In one embodiment, the abutment limiting structure further includes a first driving unit, which is disposed in the bearing box and the output end of the first driving unit is connected to the first abutment part to drive the first abutment part to move within the bearing box.

[0010] When the second abutting part moves relative to the first abutting part and abuts against the concave side of the counterweight unit, the first extension end is connected to the first abutting part by bolts to restrict the relative movement between the first abutting part and the second abutting part.

[0011] In one embodiment, the first driving unit includes a first driving part and a first transmission end. The first driving part is connected to the carrier housing, and one end of the first transmission end is connected to the first driving part, and the other end is connected to the first abutment part.

[0012] In one embodiment, the adjustment unit includes a first adjustment unit and a second adjustment unit, wherein the first adjustment unit is inserted into the side of the first abutment portion opposite to the second abutment portion, and the second adjustment unit is inserted into the side of the second abutment portion opposite to the counterweight unit.

[0013] In one embodiment, the first adjustment unit is provided with a plurality of second extension ends at intervals on the side facing the first abutment portion, and the plurality of second extension ends are inserted into the first abutment portion;

[0014] Wherein, when the first adjusting unit moves relative to the first abutting part, the second extension end is bolted to the first abutting part to restrict the relative movement between the first abutting part and the first adjusting unit.

[0015] In one embodiment, the second adjustment unit is provided with a plurality of third extension ends at intervals on the side facing the second abutment portion, and the plurality of third extension ends are inserted into the second abutment portion;

[0016] When the second adjusting unit moves relative to the second abutment, the third extension end is bolted to the second abutment to restrict the relative movement between the second abutment and the second adjusting unit.

[0017] In one embodiment, the load-bearing box includes a bottom plate, a top plate structure, and multiple side plates. The multiple side plates are all inserted into the bottom plate, and adjacent side plates are connected to each other. The top plate structure is disposed opposite to the bottom plate, and the multiple side plates are all inserted into the top plate structure. The bottom plate, the top plate structure, and the multiple side plates together form a counterweight space to accommodate the multiple abutment limiting structures and the multiple counterweight units.

[0018] In one embodiment, the base plate is provided with a plurality of first sliding grooves, and the abutment limiting structure is inserted into the first sliding groove.

[0019] In one embodiment, the top plate structure includes a top plate, a pressure plate, and a connector. A plurality of side plates are inserted into the top plate. The pressure plate abuts against the surface of the counterweight unit away from the bottom plate. The surface of the pressure plate is rotatably connected to the connector. The portion of the connector away from the pressure plate passes through the top plate and is helically engaged with the top plate.

[0020] The technical solution of this utility model is to set multiple three-abutment limiting structures in the bearing box, and the multiple abutment limiting structures abut against the inner recess of the counterweight unit respectively. The multiple abutment limiting structures are arranged around the counterweight unit, thereby restricting the counterweight unit in the bearing box. Moreover, by adjusting the position of the adjusting unit on each abutment limiting structure, the center of gravity position of the bearing box can be easily adjusted, thus ensuring the stability of the bearing box during use. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 A schematic diagram of a structure of an embodiment of the counterweight bearing device provided by this utility model;

[0023] Figure 2 A schematic diagram of another embodiment of the counterweight support device provided by this utility model;

[0024] Figure 3 A schematic diagram of another embodiment of the counterweight bearing device provided by this utility model;

[0025] Figure 4 A schematic diagram of another embodiment of the counterweight support device provided by this utility model.

[0026] Explanation of icon numbers:

[0027] 100. Counterweight bearing device; 10. Bearing box; 11. Base plate; 12. Side plate; 13. Top plate structure; 131. Pressure plate; 132. Top plate; 133. Connecting piece; 134. Tightening piece; 14. First sliding groove; 15. Second sliding groove; 16. Third sliding groove; 20. Counterweight unit; 30. Abutment and limiting structure; 31. First abutment part; 32. Second abutment part; 33. Second adjustment unit; 34. First drive unit; 341. First transmission end; 342. First drive part; 35. First adjustment unit; 36. Third extension end; 37. Second extension end; 38. Fourth extension end.

[0028] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0030] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0031] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0032] When elevators use counterweights, they need a box to support the counterweights. However, elevator counterweights are usually cast in concrete. Since most counterweights are cast as a whole, they are large in size and mass and the mass is not uniform. When multiple counterweights are stacked in the box, it cannot be guaranteed that the center of the entire box is in the required position. At this time, if the position of the stacked counterweights is adjusted, it is inefficient and time-consuming due to the mass of the stacked counterweights. This increases the difficulty of fine-tuning the counterweights and is not conducive to adjusting the center of gravity of the box.

[0033] This utility model proposes a counterweight support device.

[0034] Please see Figure 1In one embodiment of this utility model, the counterweight bearing device includes:

[0035] The supporting box 10 carries stacked counterweight units 20 inside;

[0036] Multiple abutment limiting structures 30 are arranged around the counterweight unit 20, and the abutment limiting structures 30 abut against the concave part of the counterweight unit 20.

[0037] The abutment limiting structure 30 is equipped with an adjustment unit that slides within it. After the multiple adjustment units move a preset distance away from the counterweight unit 20, the adjustment units are fixed within the abutment limiting structure 30 to adjust the center of gravity balance of the load-bearing box 10.

[0038] like Figure 2 As shown, the counterweight unit 20 has a long strip-shaped structure, and multiple recessed abutment spaces are provided on the side of the counterweight unit 20 to facilitate the assembly of the counterweight unit 20.

[0039] Furthermore, the plurality of abutment limiting structures 30 abut against different abutment spaces, and the plurality of abutment limiting structures 30 are arranged around the counterweight unit 20, thereby restricting the operation of the counterweight unit 20.

[0040] The technical solution of this utility model involves setting multiple three-abutment limiting structures 30 inside the bearing housing 10. These multiple abutment limiting structures abut against the recesses of the counterweight unit 20, and the multiple abutment limiting structures 30 are arranged around the counterweight unit 20, thereby restricting the counterweight unit 20 within the bearing housing 10. Furthermore, by adjusting the position of the adjustment unit on each abutment limiting structure 30, the center of gravity of the bearing housing 10 can be easily adjusted, ensuring the stability of the bearing housing 10 during use.

[0041] In one embodiment, the abutment limiting structure 30 includes a first abutment portion 31 and a second abutment portion 32. The first abutment portion 31 is slidably connected inside the bearing box 10 and abuts against the concave side of the counterweight unit 20. The first extension end of the second abutment portion 32 is inserted into the first abutment portion 31, and the second abutment portion 32 abuts against the concave side of the counterweight unit 20.

[0042] like Figure 2 As shown, the contact space of the counterweight unit 20 has two sides arranged at an angle.

[0043] It is understood that the first abutting part 31 and the second abutting part 32 abut against the two sides of the abutting space, respectively.

[0044] It is understood that the four abutting spaces are arranged around the counterweight unit 20 and located at the four corners of the counterweight unit 20. When the multiple abutting limiting structures 30 abut against the four abutting spaces, the forces exerted by the four abutting limiting structures 30 when they abut against each other are mutually opposed, thereby ensuring the stability of the counterweight unit within the bearing box 10.

[0045] In one embodiment, the adjacent sides of the abutment space form an acute angle. In order to facilitate the first abutment part 31 and the second abutment part 32 to abut against the adjacent sides of the abutment space respectively, the sides of the abutment space are no longer in complete contact with the first abutment part 31 and the second abutment part 32. The purpose of restriction is achieved by limiting the movement distance of the counterweight unit 20 in the translational direction.

[0046] In another embodiment, the adjacent sides of the abutting space form an obtuse angle. In this case, the contact area between the first abutting part 31 and the second abutting part 32 and the side of the abutting space is reduced, but the purpose of restricting its movement can still be achieved.

[0047] In one embodiment, the abutment limiting structure 30 further includes a first driving unit 34, which is disposed inside the support box 10, and the output end of the first driving unit 34 is connected to the first abutment part 31 to drive the first abutment part 31 to move within the support box 10.

[0048] When the second abutting part 32 moves relative to the first abutting part 31 and abuts against the concave side of the counterweight unit 20, the first extension end is connected to the first abutting part 31 by bolts to restrict the relative movement between the first abutting part 31 and the second abutting part 32.

[0049] It should be noted that the counterweight unit 20 is placed inside the bearing box 10 before the abutment limiting structure 30 operates and abuts against the counterweight unit 20.

[0050] It is understood that after the counterweight unit 20 is installed, the first drive unit 34 moves to drive the first abutment part 31 to move and make the first abutment part 31 contact the counterweight unit 20. At the same time, the second abutment part 32 is manually pulled to move so that the second abutment part 32 contacts the counterweight unit 20. Then, the relative distance between the first abutment part 31 and the second abutment part 32 is fixed to ensure the restraining effect of the first abutment part 31 and the second abutment part 32 on the counterweight unit.

[0051] In another embodiment, the second abutment portion 32 is connected to the second drive unit on the side facing the first drive unit 34, and the second drive unit abuts against the side of the first drive unit 34 facing the second abutment portion 32. When the first abutment portion 31 moves, it synchronously drives the second abutment portion 32 and the second drive unit to move, and the second drive unit is always in contact with the first drive unit 34.

[0052] It is understood that when the first driving unit 34 moves, it drives the first abutting part 31, the second abutting part 32 and the second driving unit to move, and the second driving unit is always in contact with the side of the first driving unit 34 facing the second abutting part 32. After the first abutting part 31 contacts the counterweight unit 20, the second driving unit drives the second abutting part to move, and the second abutting part 32 abuts against the side of the abutting space, thereby achieving a limiting effect.

[0053] In one embodiment, the first drive unit 34 includes a first drive part 342 and a first transmission end 341. The first drive part 342 is connected to the support housing 10. One end of the first transmission end 341 is connected to the first drive part 342, and the other end is connected to the first abutment part 31.

[0054] It is understood that the first driving part 342 is a cylinder, and the first transmission end 341 is a transmission push rod. The cylinder outputs power to drive the transmission push rod to move, thereby realizing the translation of the first abutment part 31.

[0055] In another embodiment, the second driving unit 34 includes a second driving part and a second transmission end. The second driving part is slidably connected to the side of the first driving part 342 facing the second abutment part 32. One end of the second transmission end is connected to the second driving part, and the other end is connected to the second abutment part 32.

[0056] It is understandable that when the first drive unit 342 outputs power to drive the first transmission end 341 to move, thereby driving the first abutment part 31 to move and contact the counterweight unit 20, the second drive unit outputs power to drive the second transmission end 341 to move, thereby driving the second abutment part 32 to contact the counterweight unit 20.

[0057] It should be noted that both the first drive unit 342 and the second drive unit are cylinders.

[0058] like Figure 4 As shown, the height of the first abutting part 31 and the height of the second abutting part 32 are both close to the internal height of the bearing box 10, so as to accommodate the counterweight unit 20 stacked to a certain height.

[0059] In one embodiment, the adjustment unit includes a first adjustment unit 35 and a second adjustment unit 33. The first adjustment unit 35 is inserted into the side of the first abutment 31 opposite to the second abutment 32, and the second adjustment unit 33 is inserted into the side of the second abutment 32 opposite to the counterweight unit 20.

[0060] like Figure 3 As shown, the four abutment limiting structures 30 are located at the four corners of the counterweight unit 20, so that the adjustment unit of each corner is driven synchronously or partially, thereby facilitating the fine adjustment of the center of gravity of the bearing box 10.

[0061] It should be noted that both the first adjustment unit 35 and the second adjustment unit 33 have a certain weight, which facilitates the adjustment of the center of gravity of the supporting box 10.

[0062] When the center of gravity of the bearing box 10 needs to be adjusted, the weight of the abutment limiting structure 30 within the bearing box 10 is adjusted by adjusting the distance between the first adjustment unit 35 and the first abutment part 31 and the distance between the second adjustment unit 33 and the second abutment part 32. By adjusting multiple abutment limiting structures 30 or all of the abutment limiting structures 30, the center of gravity of the bearing box 10 bearing different counterweight units 20 can be adjusted.

[0063] In one embodiment, the first adjustment unit 35 is provided with a plurality of second extension ends 37 at intervals on the side facing the first abutting portion 31, and the plurality of second extension ends 37 are inserted into the first abutting portion 31.

[0064] When the first adjustment unit 35 moves relative to the first abutment 31, the second extension end 37 is bolted to the first abutment 31 to restrict the relative movement between the first abutment 31 and the first adjustment unit 35.

[0065] It is understood that, in order to facilitate the movement of the first adjustment unit 35 relative to the first abutment 31, the second extension end 37 connected to the first adjustment unit 35 is inserted into the first abutment 31.

[0066] Furthermore, when it is necessary to adjust the distance between the first adjustment unit 35 and the first abutment 31 to adjust the center of gravity of the bearing box 10, the first adjustment unit 35 is moved so that the second extension end 37 moves relative to the first abutment 31, thereby realizing the adjustment of the distance between the first adjustment unit 35 and the first abutment 31, and also facilitating the stability between the first abutment 31 and the first adjustment unit 35. After the movement adjustment of the first adjustment unit 35 is completed, the second extension end 37 and the first abutment 31 are connected by bolts to fix the position of the first adjustment unit 35.

[0067] In one embodiment, the second adjustment unit 33 is provided with a plurality of third extension ends 36 at intervals on the side facing the second abutment portion 32, and the plurality of third extension ends 36 are inserted into the second abutment portion 32.

[0068] When the second adjustment unit 33 moves relative to the second abutment 32, the third extension end 36 is bolted to the second abutment 32 to restrict the relative movement of the second abutment 32 and the second adjustment unit 33.

[0069] It is understood that, in order to facilitate the movement of the second adjustment unit 33 relative to the second abutment 32, the third extension end 36 connected to the second adjustment unit 33 is inserted into the second abutment 32.

[0070] Furthermore, when it is necessary to adjust the distance between the second adjustment unit 33 and the second abutment part 32 to adjust the center of gravity of the bearing box 10, the second adjustment unit 33 is moved so that the third extension end 36 moves relative to the second abutment part 32, thereby realizing the adjustment of the distance between the second adjustment unit 33 and the second abutment part 32, and also facilitating the stability between the second abutment part 32 and the second adjustment unit 33. After the movement adjustment of the second adjustment unit 33 is completed, the third extension end 36 and the second abutment part 32 are connected by bolts to fix the position of the second adjustment unit 33.

[0071] In one embodiment, the supporting box 10 includes a bottom plate 11, a top plate structure 13, and a plurality of side plates 12. The plurality of side plates 12 are all inserted into the bottom plate 11, and adjacent two side plates 12 are connected to each other. The top plate structure 13 is disposed opposite to the bottom plate 11, and the plurality of side plates 12 are all inserted into the top plate structure 13. The bottom plate 11, the top plate structure 13, and the plurality of side plates 12 together form a counterweight space to accommodate the plurality of abutment limiting structures 30 and the plurality of counterweight units 20.

[0072] It is understood that the base plate 11, the top plate structure 13, and the multiple side plates 12 together form a counterweight space for supporting the counterweight unit 20.

[0073] In one embodiment, the base plate 11 is provided with a plurality of first sliding grooves 14, and the abutment limiting structure 30 is partially inserted into the first sliding grooves 14.

[0074] It is understood that, in order to facilitate the insertion of the side plates 12 into the base plate 11, the first sliding groove 14 is provided on the base plate. In order for the multiple side plates 12 to enclose the counterweight space, multiple second sliding grooves 15 are provided on the base plate 11. The multiple first sliding grooves 14 and the multiple second sliding grooves 15 are all arranged along the edge of the base plate 11. In this way, the multiple side plates 12 can be inserted along the edge of the base plate 11 to enclose the counterweight space, thereby protecting the counterweight unit 20.

[0075] Furthermore, in order to ensure the connection between two adjacent side plates 12, a connecting member is used between the two adjacent side plates 12 to ensure the stability of the connection.

[0076] In another embodiment, one of the two adjacent side plates 12 is provided with a plug groove, and the other side plate 12 is provided with a plug end that mates with the plug groove. The plug end is inserted into the plug groove to improve the stability of the connection between the two side plates 12.

[0077] To ensure the stability of the movement of the abutment limiting structure 30 on the base plate 11, a third sliding groove 16 is provided on the base plate 11, and a fourth extension end 38 is provided on the first abutment part 31, the fourth extension end 38 being inserted into the third sliding groove 16.

[0078] It is understood that when the first abutting part 31 is mounted on the base plate 11, the fourth extension end 38 slides on the third sliding groove 16 to ensure the stability of the movement of the first abutting part 31.

[0079] In one embodiment, the top plate structure 13 includes a top plate 132, a pressure plate 131, and a connector 133. A plurality of side plates 12 are inserted into the top plate 132. The pressure plate 131 abuts against the surface of the counterweight unit 20 away from the bottom plate 11. The surface of the pressure plate 131 is rotatably connected to the connector 133. The portion of the connector 133 away from the pressure plate 131 passes through the top plate 132 and is helically engaged with the top plate 132.

[0080] It is understood that by rotating the connector 133, the pressure plate 131 is brought closer to the counterweight unit 20, thereby restricting the counterweight unit 20 in the height direction and ensuring the stability of the counterweight unit 20.

[0081] Meanwhile, a tightening member 134 is connected to the end of the connector 133 that is away from the pressure plate 131. After the pressure plate 131 presses against the counterweight unit 20, the tightening member 134 rotates and abuts against the top plate 132.

[0082] In one embodiment, the connector 133 is a threaded rod.

[0083] In another example, there are multiple pressure plates 131, so that the multiple pressure plates 131 evenly cover the surface of the counterweight unit 20, thereby ensuring stability when abutting the counterweight unit 20.

[0084] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A counterweight bearing device, characterized in that, include: A support box, which carries stacked counterweight units; Multiple abutment limiting structures are arranged around the counterweight unit, and the abutment limiting structures abut against the concave part of the counterweight unit; The abutment limiting structure includes an adjustment unit that slides within it. After the multiple adjustment units move a preset distance away from the counterweight unit, the adjustment unit is fixed within the abutment limiting structure to adjust the center of gravity balance of the load-bearing box.

2. The counterweight bearing device as described in claim 1, characterized in that, The abutment limiting structure includes a first abutment part and a second abutment part. The first abutment part is slidably connected to the bearing box and abuts against the concave side of the counterweight unit. The first extension end of the second abutment part is inserted into the first abutment part, and the second abutment part abuts against the concave side of the counterweight unit.

3. The counterweight bearing device as described in claim 2, characterized in that, The abutment limiting structure further includes a first driving unit, which is disposed in the bearing box and the output end of the first driving unit is connected to the first abutment part to drive the first abutment part to move within the bearing box. When the second abutting part moves relative to the first abutting part and abuts against the concave side of the counterweight unit, the first extension end is connected to the first abutting part by bolts to restrict the relative movement between the first abutting part and the second abutting part.

4. The counterweight bearing device as described in claim 3, characterized in that, The first driving unit includes a first driving part and a first transmission end. The first driving part is connected to the carrier housing. One end of the first transmission end is connected to the first driving part, and the other end is connected to the first abutment part.

5. The counterweight bearing device as described in any one of claims 2 to 4, characterized in that, The adjustment unit includes a first adjustment unit and a second adjustment unit. The first adjustment unit is inserted into the side of the first abutment portion away from the second abutment portion, and the second adjustment unit is inserted into the side of the second abutment portion away from the counterweight unit.

6. The counterweight bearing device as described in claim 5, characterized in that, The first adjustment unit has a plurality of second extension ends spaced apart on the side facing the first abutment portion, and the plurality of second extension ends are inserted into the first abutment portion; Wherein, when the first adjusting unit moves relative to the first abutting part, the second extension end is bolted to the first abutting part to restrict the relative movement between the first abutting part and the first adjusting unit.

7. The counterweight bearing device as described in claim 5, characterized in that, The second adjustment unit has a plurality of third extension ends spaced apart on the side facing the second abutment portion, and the plurality of third extension ends are inserted into the second abutment portion; When the second adjusting unit moves relative to the second abutment, the third extension end is bolted to the second abutment to restrict the relative movement between the second abutment and the second adjusting unit.

8. The counterweight bearing device as described in any one of claims 1 to 4, characterized in that, The load-bearing box includes a bottom plate, a top plate structure, and multiple side plates. The multiple side plates are all inserted into the bottom plate, and adjacent side plates are connected to each other. The top plate structure is arranged opposite to the bottom plate, and the multiple side plates are all inserted into the top plate structure. The bottom plate, the top plate structure, and the multiple side plates together form a counterweight space to accommodate the multiple abutment limiting structures and the multiple counterweight units.

9. The counterweight bearing device as described in claim 8, characterized in that, The base plate is provided with multiple first sliding grooves, and the abutment limiting structure is inserted into the first sliding groove.

10. The counterweight bearing device as described in claim 8, characterized in that, The top plate structure includes a top plate, a pressure plate, and a connector. Multiple side plates are inserted into the top plate. The pressure plate abuts against the surface of the counterweight unit away from the bottom plate. The surface of the pressure plate is rotatably connected to the connector. The portion of the connector away from the pressure plate passes through the top plate and is helically engaged with the top plate.

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