Guide device of rope coring winch

Abstract

The utility model relates to a rope coring winch guiding device which comprises a pulley portion used for guiding a rope and a fixing portion used for fixing the pulley portion, the pulley portion comprises a main pulley and a plurality of auxiliary pulleys which are adjacently arranged, and the fixing portion comprises a vertical fixing support connected with the main pulley and a double-face fixing plate connected with the auxiliary pulleys. The vertical fixing support and the double-face fixing plate form an interlayer through two oppositely-arranged structural plates, and the double-face fixing plate is arranged on the outer side of the vertical fixing support, so that the main pulley and the auxiliary pulley can be arranged in the interlayer of the double-face fixing plate in the mode that the main pulley and the auxiliary pulley are located on the same plane, and the rope is limited between the main pulley and the auxiliary pulley. The main pulley and the auxiliary pulley jointly act on the rope under accurate positioning of the double-sided fixing plate, and the rope is effectively limited in the preset track. Even under the conditions of high-speed operation and heavy load, the rope can keep stable operation, and the problems of abrasion aggravation and efficiency reduction caused by deviation are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of wireline coring equipment for drilling rigs, in particular to a wireline coring winch alignment device. Background Art

[0002] A wireline coring winch is a lifting device used in places such as mines, construction sites, port terminals, etc. It uses a drum (winch) to wind or release a rope, thereby realizing the vertical or inclined lifting of heavy objects. In geological exploration, it is mainly used to extract underground core samples. Such a winch is usually equipped with a special rope for lowering the coring tool into the borehole and lifting it back to the ground after coring, so as to achieve the vertical or inclined lifting of heavy objects through the cyclic movement of the rope. The working process of the wireline coring winch mainly includes:

[0003] Lowering process: The operator controls the drive system of the winch to slowly release the rope, lowering the coring tool along the borehole to a predetermined depth. During this process, the rope needs to bear the weight of the tool and ensure a smooth descent to avoid damaging the core sample.

[0004] Coring process: When the coring tool reaches the target depth, the tool is started for coring. After coring is completed, a section of core sample will be contained inside the tool.

[0005] Lifting process: After coring is completed, the operator controls the winch again to lift the tool containing the core sample from the borehole back to the ground by tightening the rope. During this process, the rope not only needs to bear the weight of the tool and its internal core, but also ensure the stability during the lifting process to prevent the core from falling off.

[0006] The rope is the only component connecting the winch and the coring tool. It must be able to bear the weight of the tool and its internal core and transmit the traction force of the winch. The design and material selection of the rope need to ensure sufficient strength and wear resistance during long-term use to ensure the safety of operation and the stability of the coring process. The rope needs to adapt to different geological conditions and borehole depths and be able to maintain good working performance in various environments. Therefore, the role of the rope is crucial. However, after long-term use, due to wear, the gap becomes larger, which may cause the rope to run out of the main pulley track or the rope to be broken, etc., which will have a greater impact on normal production work.

[0007] CN214495495U discloses a material hoisting and lifting device for road construction, including an installation frame, a support column, and a lifting crossbar. One side of the top of the installation frame is fixedly connected with a control cabinet, a winch is arranged on one side of the control cabinet, a stabilizing structure is fixedly connected to one side of the installation frame, and guiding structures are fixedly connected to the top and both sides of the lifting crossbar. The bottom end of the fixed frame is fixedly connected to the top end of the lifting crossbar.

[0008] The hoisting and lifting equipment of this patent is provided with a guiding structure. When the winch winds up the hoisting rope, the hoisting rope is restricted by the guiding groove and cannot shake. Moreover, the rotating structure of the fixed frame and the guiding wheel reduces the friction when the hoisting rope moves, thus avoiding the shaking and wear of the hoisting rope while guiding the hoisting rope. However, it is inconvenient to maintain and replace the guiding structure of the hoisting and lifting equipment of this patent, and this limitation is particularly prominent after the equipment has experienced long-term operation and heavy load conditions. As the wear of the guiding structure intensifies, the stability of the steel wire rope is threatened and it may not be able to stably stay within the preset track, thus directly weakening the operating efficiency and safety of the hoisting and lifting equipment.

[0009] In addition, on the one hand, there are differences in the understanding of those skilled in the art; on the other hand, although the applicant has studied a large number of documents and patents when making this utility model, due to space limitations, all details and contents are not listed in detail. However, this does not mean that this utility model does not possess the features of these prior arts. On the contrary, this utility model already possesses all the features of the prior arts, and the applicant reserves the right to add relevant prior arts in the background art. Summary of the Utility Model

[0010] In view of the deficiencies of the prior art, the present application proposes a core barrel wireline winch alignment device, aiming to solve one or more technical problems in the prior art.

[0011] The present utility model proposes a core barrel wireline winch alignment device, which includes a pulley part for realizing rope guiding and a fixing part for fixing the pulley part. The pulley part includes a main pulley and several auxiliary pulleys arranged adjacent to each other. The fixing part includes a vertical fixing bracket connected to the main pulley and a double-sided fixing plate connected to the auxiliary pulleys. Among them, both the vertical fixing bracket and the double-sided fixing plate are formed with a sandwich by two relatively arranged structural plates, and the double-sided fixing plate is arranged outside the vertical fixing bracket, so that the main pulley and the auxiliary pulleys can be arranged in the sandwich of the double-sided fixing plate in the same plane to limit the rope between the main pulley and the auxiliary pulleys.

[0012] The device of the utility model can achieve a smoother and more stable transition of the rope when passing through the pulley part through the adjacent configuration of the main pulley and the auxiliary pulley, reducing the swing and vibration of the rope during the guiding process, thereby improving the stability of the overall guiding system. The design of the coplanar configuration of the main pulley and the auxiliary pulley reduces the bending and twisting of the rope, which helps to reduce the wear of the rope and extend its service life. The sandwich structure formed by the vertical fixed bracket and the double-sided fixed plate can provide a solid support for the pulley part, enhance the rigidity of the entire guiding device, and enable it to withstand a larger workload without deformation. In addition, since the main pulley and the auxiliary pulley are fixed on the same plane, the tension and guidance of the rope can be controlled more accurately, which is conducive to the fine operation of the rope by the rope coring winch.

[0013] According to a preferred embodiment, the fixing portion includes a transverse fixing bracket configured as a channel steel, and the transverse fixing bracket is provided with a plurality of threaded through holes for accommodating positioning bolts at intervals along the length direction of its web. The channel steel has high bending and torsional strength due to its cross-sectional characteristics. As a transverse fixing bracket, it can withstand greater loads and thus provide a stable support foundation. The threaded through holes provided at intervals along the length direction of the web of the transverse fixing bracket can provide precise installation positions for the positioning bolts, ensuring accurate fixing and alignment of the pulley portion. These through holes allow the positioning bolts to be installed at different positions, thereby accommodating pulleys of different sizes or adjusting the spacing of the pulley portions, thereby improving the adaptability and flexibility of the device.

[0014] According to a preferred embodiment, two structural plates arranged opposite to each other of the vertical fixing bracket extend out folded edges coplanar with the web of the transverse fixing bracket in a manner of departing from each other at one end close to the transverse fixing bracket, and holes matching the threaded through holes are provided on the folded edges, so that the vertical fixing bracket can be detachably connected to the transverse fixing bracket through positioning bolts in a manner that the interlayer width thereof is adjustable. By configuring the folded edges to be coplanar with the web of the transverse fixing bracket, the adjustability of the interlayer width can be provided, which allows the interlayer thickness of the vertical fixing bracket to be adjusted as required. The holes provided on the folded edges can match the threaded through holes on the transverse fixing bracket, which ensures that the vertical fixing bracket and the transverse fixing bracket can be accurately aligned, thereby ensuring the structural stability and accuracy of the entire guide device. The design of the folded edges enhances the structural stability of the connection point between the vertical fixing bracket and the transverse fixing bracket, so that the entire guide device can withstand a larger workload.

[0015] According to a preferred embodiment, an adjusting bolt is disposed at one end of the vertical fixing bracket away from the horizontal fixing bracket, and the adjusting bolt maintains the thickness of the sandwich layer of the vertical fixing bracket by passing through the sandwich layer of the vertical fixing bracket. In view of the lack of stability at the end of the vertical fixing bracket away from the horizontal fixing bracket due to the lack of direct structural connection, the thickness of the sandwich layer of the double-layer plate structure at this end may be difficult to remain consistent throughout the entire length without the action of the lateral support force. Such non-uniformity may hinder the normal rotation of the main pulley. By disposing an adjusting bolt at the suspended end of the vertical fixing bracket, a direct connection and fastening of the double-layer plate structure are achieved. By precisely adjusting the tightening degree of the adjusting bolt, the consistency of the sandwich layer thickness can be effectively controlled and maintained, ensuring that it matches the sandwich layer thickness maintained at the connection end with the horizontal fixing bracket.

[0016] According to a preferred embodiment, both the main pulley and the auxiliary pulley are provided with pulley bearings at their respective shaft positions to assist rotation. Among them, a first fixing bolt is disposed through the pulley bearing of the main pulley, and a second fixing bolt is disposed through the pulley bearing of the auxiliary pulley. The design of the pulley bearing significantly reduces the friction coefficient of the rope on the pulley, enabling the rope to pass through the pulley more smoothly, reducing power loss. The rotation ability of the main pulley and the auxiliary pulley ensures the continuity and smoothness of the rope during the guiding process, improving the overall guiding efficiency.

[0017] According to a preferred embodiment, the second fixing bolt passes through the double-sided fixing plate and is slidably connected to the pulley bearing of the auxiliary pulley, and the first fixing bolt passes through the vertical fixing bracket and the double-sided fixing plate in sequence and is slidably connected to the pulley bearing of the main pulley. The configuration of the fixing bolt enables the pulley bearing to be stably installed at a predetermined position, and the sliding connection method adopted enables it to adapt to manufacturing tolerances, minor changes during the installation process, or dimensional changes caused by temperature changes during operation. According to a preferred embodiment, a plurality of adjusting holes are disposed at intervals along the length direction of the vertical fixing bracket, and the first fixing bolt can adjust the distance between the main pulley and the horizontal fixing bracket by being installed in different adjusting holes. The setting of the adjusting holes provides multiple installation options for the first fixing bolt, so that the distance between the main pulley and the horizontal fixing bracket can be adjusted according to actual needs, realizing precise adjustment of the pulley position. The design of the adjusting holes allows for fine adjustment or repositioning of the position of the main pulley without disassembling the entire alignment device, facilitating maintenance and performance optimization.

[0018] According to a preferred embodiment, when multiple auxiliary pulleys are connected to the double-sided fixing plate, the sizes of the auxiliary pulleys and the distances from the main pulley are the same. The same-sized auxiliary pulleys and the unified spacing ensure that the loads on the ropes on each pulley are evenly distributed, avoiding rope wear or pulley damage caused by uneven loads.

[0019] According to a preferred embodiment, an elastic retaining ring is provided on the rod body of the second fixing bolt. The elastic retaining ring can limit the axial transverse movement of the auxiliary pulley in a way that fills the gap between the auxiliary pulley and the double-sided fixing plate. By filling the gap between the auxiliary pulley and the double-sided fixing plate, the elastic retaining ring effectively restricts the axial transverse movement of the auxiliary pulley, enhancing the positioning stability of the pulley. The application of the elastic retaining ring prevents the possible deviation of the auxiliary pulley when under force, ensuring the stable guiding of the rope on the pulley.

[0020] According to a preferred embodiment, the surfaces of the vertical fixing bracket, the double-sided fixing plate, the main pulley, and the auxiliary pulley are coated with an anti-corrosion layer and a wear-resistant layer. The application of the anti-corrosion layer significantly improves the corrosion resistance of the metal surface, capable of resisting the erosion of corrosive media such as moisture, salt spray, and chemicals, and extending the service life of the components. The coating of the wear-resistant layer reduces the wear of the surfaces of the pulley and the bracket caused by rope friction, load stress, and environmental factors, maintaining the geometric accuracy and surface finish of the components. Description of the Drawings

[0021] Figure 1 is the overall structural schematic diagram of the alignment device of the present utility model from a top-down perspective;

[0022] Figure 2 is the overall structural schematic diagram of the alignment device of the present utility model from a bottom-up perspective;

[0023] Figure 3 is the partial structural schematic diagram of the pulley part of the alignment device of the present utility model;

[0024] Figure 4 is the partial structural schematic diagram of the fixing part of the alignment device of the present utility model;

[0025] Figure 5 is the structural schematic diagram of the main pulley and the auxiliary pulley of the alignment device of the present utility model;

[0026] Figure 6 is the partial disassembled diagram of the alignment device of the present utility model.

[0027] List of Reference Numerals

[0028] 100: Pulley part; 110: Main pulley; 120: Auxiliary pulley; 122: Elastic retaining ring; 130: Pulley bearing; 200: Fixing part; 211: First fixing bolt; 212: Second fixing bolt; 220: Horizontal fixing bracket; 221: Threaded through-hole; 230: Vertical fixing bracket; 231: Adjusting hole; 240: Double-sided fixing plate; 250: Positioning bolt; 260: Adjusting bolt. Detailed Embodiment

[0029] The present utility model will be described in detail below with reference to the accompanying drawings.

[0030] The utility model relates to a guiding device for a rope coring winch, such as Figure 1 , Figure 6 As shown, it comprises a pulley portion 100 and a fixing portion 200 , wherein the pulley portion 100 can guide a rope with a coring drill tool at the end thereof, and the fixing portion 200 is designed to stably install the pulley portion 100 .

[0031] Preferably, if Figure 1 As shown, the pulley unit 100 is designed to include a main pulley 110 and a plurality of auxiliary pulleys 120, which are arranged adjacent to each other to form a coordinated guiding mechanism. The main pulley 110 is the main guiding element and undertakes the main guiding task; the auxiliary pulleys 120 are arranged according to actual needs to assist in stabilizing the rope path and reduce shaking and deviation.

[0032] Preferably, if Figure 1 , Figure 4 As shown, the fixing part 200 includes a vertical fixing bracket 230 and a double-sided fixing plate 240, both of which are formed by two parallel and oppositely arranged structural plates to form a sandwich structure. The vertical fixing bracket 230 is designed to stably install the main pulley 110, and the main pulley 110 is ensured to be stable and not shaken by being accommodated in the sandwich. The sandwich thickness of the double-sided fixing plate 240 is greater than the sandwich thickness of the vertical fixing bracket 230, so that the double-sided fixing plate 240 can be accurately positioned outside the sandwich of the vertical fixing bracket 230, thereby forming an overall composite sandwich structure, which enhances the stability and rigidity of the structure. Preferably, the double-sided fixing plate 240 can be designed to contain the auxiliary pulley 120 therein. This design layout ensures that the main pulley 110 and the auxiliary pulley 120 are positioned in the same plane, thereby achieving precise rope guidance. Through this layout, the rope is effectively confined in the channel formed by the main pulley 110 and the auxiliary pulley 120 (such as Figure 6 As shown), it ensures the stable operation and guiding efficiency of the rope.

[0033] Preferably, if Figure 1 , Figure 4 As shown, the fixing part 200 includes a transverse fixing bracket 220, and the material of the transverse fixing bracket 220 is selected from high-strength channel steel, which ensures the stability and safety of the fixing part 200 with its excellent load-bearing capacity and good processing performance. The transverse fixing bracket 220 is provided with a plurality of threaded through holes 221 spaced apart along the length direction of its web. The diameter and pitch standards of the positioning bolts 250 selected for these threaded through holes 221 are processed by high-precision CNC processing equipment to ensure the position accuracy, hole diameter consistency and processing quality of the internal thread of the threaded through hole 221 to meet the requirements of high-precision positioning. The hole diameter and internal thread specifications of the threaded through hole 221 are precisely designed to ensure the close fit between the bolt and the hole and enhance the connection strength.

[0034] Preferably, as Figure 1 、 Figure 2 shown, at one end of each structural plate of the vertical fixing bracket 230 close to the horizontal fixing bracket 220, a flanging is respectively extended. The flanging preferably bends in a right-angle form along the edge of the structural plate to ensure being in the same plane as the web of the horizontal fixing bracket 220. Holes matching the preset threaded through-holes 221 on the horizontal fixing bracket 220 are opened on the flanging. The positions, sizes and shapes of these holes are designed to ensure that the positioning bolts 250 can pass through smoothly to achieve a firm connection. At the same time, the edges of the holes can be chamfered to facilitate the insertion of the bolts and reduce stress concentration. By selecting positioning bolts 250 with appropriate lengths and combining with lock nuts, the vertical fixing bracket 230 can be connected to the horizontal fixing bracket 220 in a manner that the width of the sandwich is adjustable. This mechanism allows the spacing between the vertical brackets to be adjusted according to actual needs at the construction site to adapt to different installation conditions, thereby improving the flexibility and adaptability of the structure. Since standard threaded connectors are used, this connection structure is very convenient during the fastening and disassembly processes and can be completed without special tools, significantly improving the construction efficiency.

[0035] Preferably, as Figure 2 shown, at an appropriate position of the vertical fixing bracket 230 away from the horizontal fixing bracket 220, an adjusting bolt 260 is designed and installed. The adjusting bolt 260 should be designed in the form of a long screw rod, and its length is sufficient to penetrate the entire bracket sandwich. A through-hole matching the adjusting bolt 260 needs to be reserved in the sandwich structure of the vertical fixing bracket 230 to ensure that the adjusting bolt 260 can penetrate smoothly. By rotating the head of the adjusting bolt 260, it moves horizontally within the bracket sandwich, thereby realizing the dynamic adjustment of the sandwich thickness. During the adjustment process, the ideal thickness of the sandwich can be set according to actual needs, and the adjusting bolt 260 can be fixed at the corresponding position by a lock nut to ensure the stability and durability of the sandwich. To enhance the structural strength and stability of the bracket during the adjustment process, auxiliary structures such as reinforcing ribs and support plates can be arranged inside the sandwich. These structures can be used in cooperation with the adjusting bolt 260 to jointly bear and disperse the stress and load generated during the adjustment process.

[0036] Preferably, as Figure 3 、 Figure 5As shown, both the main pulley 110 and the auxiliary pulley 120 are equipped with pulley bearings 130. A fixing bolt passes through the center of the pulley bearing 130, allowing the pulley to freely rotate around the axis of the pulley bearing 130 or the fixing bolt to reduce the friction during the guiding process of the rope. Specifically, a first fixing bolt 211 passes through the pulley bearing 130 of the main pulley 110, and a second fixing bolt 212 passes through the pulley bearing 130 of the auxiliary pulley 120. This nested structural layout enables the main pulley 110 and the auxiliary pulley 120 to be stably installed in the sandwich layer formed by the fixing part 200, and can ensure that the main pulley 110 and the auxiliary pulley 120 are coplanar, realizing the smooth transition and guiding of the rope between the main pulley 110 and the auxiliary pulley 120.

[0037] Preferably, as Figure 1 、 Figure 2 shown, the pulley bearings 130 carried by the main pulley 110 and the auxiliary pulley 120 are both fixed by the fixing bolts passing through. These fixing bolts not only maintain the position of the pulley bearing 130, but also ensure the precise alignment and stable rotation of the pulley bearing 130 during operation. Specifically, the fixing bolts include a first fixing bolt 211 and a second fixing bolt 212. Among them, the second fixing bolt 212 passes through the double-sided fixing plate 240 and is slidably connected to the pulley bearing 130 of the auxiliary pulley 120, and the first fixing bolt 211 passes through the vertical fixing bracket 230 and the double-sided fixing plate 240 in sequence and is slidably connected to the pulley bearing 130 of the main pulley 110. This design provides a reliable fixing mechanism to prevent the pulley bearing 130 from displacing or rotating under the load, thus ensuring the stability and durability of the wireline coring winch alignment device during long-term operation.

[0038] Preferably, as Figure 4 shown, a series of adjustment holes 231 are equidistantly distributed along the length direction of the vertical fixing bracket 230. The purpose of these holes is to provide a fine-tuning function so that the position of the main pulley 110 can be precisely adjusted. The first fixing bolt 211 can be installed in any adjustment hole 231 to adjust the distance between the main pulley 110 and the horizontal fixing bracket 220. This design of the present utility model endows the device with high adaptability and flexibility, allowing the relative position of the main pulley 110 to be adjusted according to the specific size of the rope and the requirements of the working load, optimizing the guiding and tension distribution of the rope on the main pulley 110. In this way, the wireline coring winch alignment device can achieve more precise adjustment, ensure the stability and efficiency of the rope during the alignment process, and improve the reliability and durability of the equipment.

[0039] Preferably, when two or more auxiliary pulleys 120 are arranged on the double-sided fixing plate 240, the diameters and sizes of each auxiliary pulley 120 are kept consistent. In addition, the distances between these auxiliary pulleys 120 and the main pulley 110 are also the same. By maintaining the consistency of the distances between each auxiliary pulley 120 and the main pulley 110, the balance of the force line during the transmission process can be ensured, and the extra friction and wear caused by uneven distances can be reduced, so as to achieve an even load distribution and an optimized rope path during the rope alignment process.

[0040] Preferably, as Figure 3 shown, an elastic retaining ring 122 is installed on the rod body of the second fixing bolt 212. The elastic retaining ring 122 restricts the axial transverse movement of the auxiliary pulley 120 by filling the gap between the auxiliary pulley 120 and the double-sided fixing plate 240. The installation of the elastic retaining ring 122 ensures the axial fixity of the auxiliary pulley 120 and prevents its unexpected transverse movement during operation. This design ensures the smooth rolling of the rope on the auxiliary pulley 120, reduces the rope deviation or vibration caused by the movement of the pulley, and thus improves the operation efficiency and reliability of the rope core winch alignment device.

[0041] Preferably, the surfaces of the vertical fixing bracket 230, the double-sided fixing plate 240, the main pulley 110 and the auxiliary pulley 120 are treated with a special coating to improve the corrosion resistance and weather resistance and meet the use requirements under harsh environments such as mines, construction sites, port terminals, etc. The coating may include an ultraviolet protection layer to prevent the material aging caused by long-term exposure to sunlight; a corrosion-resistant layer to resist chemical corrosion and seawater erosion; and a wear-resistant layer to improve the durability of the device.

[0042] It should be noted that the above specific embodiments are exemplary. Those skilled in the art can come up with various solutions inspired by the disclosure content of the present invention, and these solutions also belong to the disclosure scope of the present invention and fall within the protection scope of the present invention. Those skilled in the art should understand that the description and drawings of the present invention are illustrative and do not constitute a limitation to the claims. The protection scope of the present invention is defined by the claims and their equivalents. Throughout the text, the features guided by "Preferably" are only an optional manner and should not be understood as must be set. Therefore, the applicant reserves the right to abandon or delete the relevant preferred features at any time.

Claims

1. A rope coring winch guiding device, comprising a pulley portion (100) for guiding the rope and a fixing portion (200) for fixing the pulley portion (100), characterized in that: The pulley part (100) comprises a main pulley (110) and a plurality of auxiliary pulleys (120) arranged adjacent to each other, and the fixing part (200) comprises a vertical fixing bracket (230) connected to the main pulley (110) and a double-sided fixing plate (240) connected to the auxiliary pulley (120), wherein: The vertical fixing bracket (230) and the double-sided fixing plate (240) both form a sandwich by two oppositely arranged structural plates, and the double-sided fixing plate (240) is arranged on the outer side of the vertical fixing bracket (230), so that the main pulley (110) can be arranged in the sandwich of the double-sided fixing plate (240) in the form of being in the same plane as the auxiliary pulley (120), so as to confine the rope between the main pulley (110) and the auxiliary pulley (120).

2. The device according to claim 1, characterized in that The fixing portion (200) comprises a transverse fixing bracket (220) configured as a channel steel, and the transverse fixing bracket (220) is provided with a plurality of threaded through holes (221) for accommodating positioning bolts (250) at intervals along the length direction of the web.

3. The device according to claim 2, characterized in that The two structural plates arranged opposite to each other of the vertical fixing bracket (230) extend away from each other at one end close to the transverse fixing bracket (220) to form folded edges coplanar with the web of the transverse fixing bracket (220), and holes matching the threaded through holes (221) are provided on the folded edges so that the vertical fixing bracket (230) can be detachably connected to the transverse fixing bracket (220) through the positioning bolts (250) in a manner that the interlayer width thereof is adjustable.

4. The device according to claim 2, characterized in that An adjusting bolt (260) is disposed at one end of the vertical fixing bracket (230) away from the horizontal fixing bracket (220), and the adjusting bolt (260) maintains the thickness of the interlayer by penetrating the interlayer of the vertical fixing bracket (230).

5. The device according to claim 2, characterized in that The main pulley (110) and the auxiliary pulley (120) are both provided with pulley bearings (130) at their own rotation axes to assist rotation, wherein a first fixing bolt (211) is penetrated through the pulley bearing (130) of the main pulley (110), and a second fixing bolt (212) is penetrated through the pulley bearing (130) of the auxiliary pulley (120).

6. The device according to claim 5, characterized in that The second fixing bolt (212) passes through the double-sided fixing plate (240) and is slidably connected to the pulley bearing (130) of the auxiliary pulley (120), and the first fixing bolt (211) successively passes through the vertical fixing bracket (230) and the double-sided fixing plate (240) and is slidably connected to the pulley bearing (130) of the main pulley (110).

7. The device according to claim 5, characterized in that The vertical fixing bracket (230) is provided with a plurality of adjustment holes (231) at intervals along its length direction, and the first fixing bolt (211) can be installed in different adjustment holes (231) to adjust the distance between the main pulley (110) and the horizontal fixing bracket (220).

8. The device according to claim 1, characterized in that When a plurality of the auxiliary pulleys (120) are connected to the double-sided fixing plate (240), the size of each auxiliary pulley (120) and the spacing between the auxiliary pulleys (120) and the main pulley (110) are the same.

9. The device according to claim 5, characterized in that The rod body of the second fixing bolt (212) is provided with an elastic retaining ring (122), and the elastic retaining ring (122) can limit the axial transverse movement of the auxiliary pulley (120) by filling the gap between the auxiliary pulley (120) and the double-sided fixing plate (240).

10. The device according to claim 1, characterized in that The surfaces of the vertical fixing bracket (230), the double-sided fixing plate (240), the main pulley (110) and the auxiliary pulley (120) are coated with an anti-corrosion layer and a wear-resistant layer.

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