A wall-mounted power conduit for grain delivery

Abstract

The utility model relates to: a wall -hanging power pipeline for grain conveying, include: pipeline main part and damping assembly, the damping assembly includes installation shell, the installation shell is equipped in the outside of pipeline main part, and the inside of installation shell is provided with magnetorheological damper mechanism, magnetorheological damper mechanism is used to consume the kinetic energy of vibration, the utility model discloses through setting installation shell, metal ball, rope and permanent magnet etc. parts, through the cooperation between metal ball and rope, make when installing in the outside of pipeline main part, when the vibration of pipeline main part can be passed to metal ball through the rope, make metal ball move in cylindrical cavity, and produce magnetorheological damping phenomenon under the action of permanent magnet, and then consume the kinetic energy of vibration, weaken the negative influence that vibration brings to pipeline main part, and through the setting of clamping piece, make the height of metal ball can change, and then change the state in the process of metal ball shaking.

Description

Technical Field

[0001] This utility model relates to the field of grain conveying technology, specifically to a wall-mounted power pipeline for grain conveying. Background Technology

[0002] Grain transportation involves using specific equipment and systems to move grain from its place of origin to warehouses, processing plants, or from storage points to end-consumer scenarios. The core objective is to ensure that the grain is not damaged, moldy, or contaminated during transportation.

[0003] Powered pipeline systems are a method of grain transportation. By laying pipelines, the grain is driven by compressed air / negative pressure airflow, causing the grain and airflow to interact and achieve the effect of transportation through the pipeline. In the above process, the pipeline is fixed to the wall or ceiling (hereinafter referred to as the wall) directly below by brackets. At this time, the brackets and the wall are connected to each other by screws. The core working principle of pneumatic conveying pipelines is to generate positive or negative pressure airflow through power devices such as Roots blowers and vacuum pumps, causing grain particles to form a gas-solid two-phase flow, achieving directional conveying within the pipeline. However, in actual operation, these pipelines generally face the technical challenge of significant vibration problems, specifically manifested as follows: The sources of vibration are complex: on the one hand, when the airflow flows in the pipeline, it is easy to generate airflow vibration due to fan pulsation, eddies at pipe diameter changes / bends, etc. On the other hand, the collision and friction between grain particles and the inner wall of the pipeline (especially when conveying hard particles such as corn and wheat) will generate solid impact vibration. The superposition of the two types of vibrations will cause the overall vibration frequency of the pipeline to reach 5-50Hz, and the amplitude is usually 2-8mm. Vibration poses significant hazards: long-term vibration can cause the bolts connecting the pipes and wall-mounted supports to loosen (requiring retightening on average every 3 months), and in severe cases, it can cause the supports to fall off, posing a safety hazard of equipment falling. At the same time, vibration can accelerate the wear of the inner wall of the pipes (especially at bends, where the wear rate is 3-5 times faster than that of static pipes), shortening the service life of the pipes (the life of conventional carbon steel pipes is reduced from 5 years to 2-3 years). In addition, vibration may also lead to an increase in the breakage rate of grain particles (e.g., the breakage rate of wheat increases from 1% to more than 3%), affecting the quality of grains, and the noise generated by vibration (usually 65-85dB) can damage the workshop working environment and fail to meet the requirements of the "Design Code for Noise Control of Industrial Enterprises" (GB / T50087). Existing solutions for pipeline vibration mainly fall into two categories: one is to reduce the source of vibration by optimizing the pipeline layout (such as increasing the radius of curvature of bends and reducing the number of diameter changes), but this solution is only suitable for new projects, and it is difficult and costly to modify existing pipelines; the other is to use traditional vibration damping components such as rubber damping pads and spring vibration dampers, but these components are easily contaminated by grain dust (dust entering the damping gap will cause the damping effect to decrease by more than 50%), and they are prone to aging in the humid environment of grain transportation (such as the plum rain season in the south, where the air humidity can reach more than 85%), requiring replacement every 6-12 months, resulting in high maintenance costs; Therefore, developing a vibration reduction solution that is compatible with wall-mounted grain power pipelines, has stable vibration reduction effect, is resistant to dust and moisture, and is easy to maintain has become a key requirement to solve the pain points of existing technologies. Utility Model Content

[0004] Based on the above description, this utility model provides a wall-mounted power pipeline for grain transportation, which solves the problems of high vibration hazards, poor effectiveness of traditional vibration reduction schemes, and high maintenance costs in the prior art.

[0005] The technical solution of this utility model to solve the above-mentioned technical problems is as follows: a wall-mounted power pipeline for grain transportation, comprising: a pipeline body and a vibration damping component; The vibration damping assembly includes a mounting housing, which is fitted over the outside of the pipe body, and a magnetic damping mechanism is provided inside the mounting housing to dissipate the kinetic energy of the vibration.

[0006] Based on the above technical solution, the present invention can be further improved as follows.

[0007] Furthermore, the mounting housing includes two mounting blocks, each mounting block has a semi-circular hoop on its top, and a mounting ear is provided at one end of the semi-circular hoop facing away from the mounting block. Two adjacent mounting ears are connected to each other by screws and nuts. The pipe body is located between the two semi-circular hoops and is in close contact with the surfaces of the opposite sides of the two semi-circular hoops.

[0008] Furthermore, each of the two mounting blocks has a semi-circular groove on one side opposite to the other, and the two semi-circular grooves form a cylindrical cavity. A semi-groove is provided on the surface of the semi-circular groove facing the semi-circular hoop, and a rope guiding cavity is formed between the two semi-grooves. The end of the rope guiding cavity away from the cylindrical cavity is open.

[0009] Furthermore, protrusions and semi-threaded posts are provided on the surfaces of adjacent sides of the two mounting blocks. The two protrusions are located at the opening of the rope guiding cavity, and a fixed pulley is provided between the two protrusions. A fixed pulley is provided inside the rope guiding cavity at one end near the cylindrical cavity. The two fixed pulleys are distributed in parallel, and the two semi-threaded posts cooperate with each other to form a complete threaded post.

[0010] Furthermore, each of the two mounting blocks is provided with a limiting groove on its opposite side, and both ends of the limiting groove are open. The lower surface of the mounting block is provided with a plurality of magnet placement grooves, which are an even number and are distributed in a ring at equal intervals along the outer edge of the cylindrical cavity. Permanent magnets are provided inside the magnet placement grooves.

[0011] Furthermore, a clamping member and a nut are sleeved on the outside of the threaded post, the clamping member being located between the mounting block and the nut, and the nut being threadedly connected to the threaded post.

[0012] Furthermore, the clamping member includes a clamping plate, a central hole is provided at the center of the clamping plate, the threaded post passes through the central hole, and side plates are provided on both sides of the clamping plate, the side plates extending into the interior of the limiting groove.

[0013] Furthermore, the bottom end of the mounting block is provided with a bottom cover by screws. The bottom cover includes a cover plate, and a through hole is provided at the center of the cover plate. The through hole is located directly below the cylindrical cavity and communicates with the cylindrical cavity. The inner diameter of the through hole is smaller than the inner diameter of the cylindrical cavity.

[0014] Furthermore, a metal ball is disposed inside the cylindrical cavity, and the metal ball is made of a non-ferromagnetic material with high conductivity.

[0015] Furthermore, a rope is provided on the top of the metal ball, the rope extends along the direction of the rope guide cavity, and contacts the two fixed pulleys simultaneously during the extension process. The end of the rope away from the metal ball is wrapped around the outside of the threaded column and is in close contact with the surface of the clamping member facing the mounting housing.

[0016] Compared with the prior art, the technical solution of this application has the following beneficial technical effects: 1. This utility model, by setting up a mounting shell, a metal ball, a rope, and a permanent magnet, etc., through the cooperation between the metal ball and the rope, allows the vibration of the pipe body to be transmitted to the metal ball through the rope when it is installed on the outside of the pipe body. This causes the metal ball to move in the cylindrical cavity and generate magnetic damping under the action of the permanent magnet, thereby consuming the kinetic energy of the vibration and reducing the negative impact of the vibration on the pipe body. 2. By designing the mounting housing, fixed pulley, and clamping components, the rope can be loosened or fixed by loosening or tightening the clamping components. This changes the height of the metal ball, i.e., the distance between the second fixed pulley and the metal ball changes, resulting in different characteristics of the metal ball's movement to meet different needs. Attached Figure Description

[0017] Figure 1 A schematic diagram of a wall-mounted power pipeline for grain transportation provided in an embodiment of this utility model; Figure 2 This is a schematic diagram of the vibration damping component in an embodiment of the present invention; Figure 3 for Figure 2 Structural sectional view; Figure 4 for Figure 3 Another structural diagram from a different perspective; Figure 5 This is an exploded view of the outer casing in an embodiment of the present invention; Figure 6 This is a schematic diagram of the structure for mounting the outer shell in an embodiment of this utility model; Figure 7 This is a schematic diagram of the clamping component in an embodiment of the present utility model; Figure 8 This is a schematic diagram of the permanent magnet structure in an embodiment of the present invention; Figure 9 This is a schematic diagram showing the usage state of the permanent magnet in an embodiment of this utility model; Figure 10 This is a schematic diagram showing the usage state of the permanent magnet in an embodiment of this utility model; Figure 11 This is a schematic diagram showing the usage state of the permanent magnet in an embodiment of this utility model; The attached diagram lists the components represented by each number as follows: 1. Pipe body; 2. Housing; 21. Mounting block; 22. Semicircular hoop; 23. Mounting ear; 24. Semicircular groove; 25. Semi-groove; 26. Protrusion; 27. Magnet placement groove; 28. Semi-threaded column; 29. ​​Limiting groove; 3. Bottom cover; 31. Cover plate; 32. Through hole; 4. Metal ball; 5. Rope; 6. Fixed pulley; 7. Clamping component; 71. Clamping plate; 72. Side plate; 73. Center hole; 8. Permanent magnet. Detailed Implementation

[0018] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application.

[0020] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0021] Please see Figure 1 A wall-mounted power pipeline for grain transportation includes: a pipeline body 1 and a vibration damping assembly; The vibration damping component includes a mounting housing 2, which is sleeved on the outside of the pipe body 1, and a magnetic damping mechanism is provided inside the mounting housing 2 to dissipate the kinetic energy of the vibration. Based on the above, the mounting shell 2 is fixed to the outside of the pipe body 1. Since the power pipeline is a mature existing technology and the center of gravity of this technical solution is at the vibration damping component, the other main structures of the power pipeline are not described here. The setting of the magnetic damping mechanism allows the pipe body 1 to buffer and consume vibration through the magnetic damping phenomenon, thereby reducing the negative effects of vibration and extending the service life of the power pipeline.

[0022] like Figures 2-6 As shown, the mounting housing 2 includes two mounting blocks 21. A semi-circular hoop 22 is provided on the top of the mounting block 21. A mounting ear 23 is provided on one end of the semi-circular hoop 22 away from the mounting block 21. Two adjacent mounting ears 23 are connected to each other by screws and nuts. The pipe body 1 is located between the two semi-circular hoops 22 and is in close contact with the surface of the opposite side of the two semi-circular hoops 22. Each of the two mounting blocks 21 has a semi-circular groove 24 on one side opposite to the other, forming a cylindrical cavity. A semi-groove 25 is provided on the surface of the semi-circular groove 24 facing the semi-circular hoop 22, forming a rope guiding cavity between the two semi-groove 25. The end of the rope guiding cavity away from the cylindrical cavity is open. Each of the two mounting blocks 21 has a protrusion 26 and a semi-threaded post 28 on an adjacent surface. The two protrusions 26 are located at the opening of the rope guiding cavity, and a fixed pulley 6 is provided between the two protrusions 26. A fixed pulley 6 is provided inside the end of the rope guiding cavity near the cylindrical cavity. The two fixed pulleys 6 are parallel to each other, and the two semi-threaded posts 28 cooperate to form a complete threaded post. Each of the two mounting blocks 21 has a limiting groove 29 on its opposite side. Both ends of the limiting groove 29 are open. The lower surface of the mounting block 21 has a plurality of magnet placement grooves 27. There are an even number of magnet placement grooves 27, which are distributed in a ring at equal intervals along the outer edge of the cylindrical cavity. Permanent magnets 8 are placed inside the magnet placement grooves 27, preferably neodymium iron boron strong magnets (grades N35-N52). Based on the above, the two mounting ears 23 are connected to each other by screws and nuts. At this time, the semicircular hoop 22 and the mounting block 21 are fixed to the outside of the pipe body 1 under the action of the mounting ears 23. The two mounting blocks 21 are connected to each other by threaded columns and nuts. After connection, the two semicircular grooves 24 form a cylindrical cavity, and the two semicircular grooves 25 form a rope guiding cavity. The fixed pulley 6 can turn the rope 5, making the rope 5 easy for the user to operate. The setting of the limiting groove 29 restricts the clamping member 7, so that the clamping member 7 can only move along the direction of the limiting groove 29. After the permanent magnet 8 is placed inside the magnet placement groove 27, it can affect the metal ball 4 located inside the cylindrical cavity. That is, when the metal ball 4 moves inside the cylindrical cavity, it will cut the magnetic field lines and produce magnetic damping phenomenon.

[0023] like Figure 2 , Figure 3 as well as Figure 7 As shown, a clamping member 7 and a nut are sleeved on the outside of the threaded column. The clamping member 7 is located between the mounting block 21 and the nut, and the nut is threadedly connected to the threaded column. The clamping member 7 includes a clamping plate 71, a central hole 73 is provided at the center of the clamping plate 71, the threaded post passes through the central hole 73, and side plates 72 are provided on both sides of the clamping plate 71, the side plates 72 extending into the interior of the limiting groove 29. Based on the above, the clamping member 7 serves to connect the two mounting blocks 21 on the one hand, and to clamp and fix the rope 5 wrapped around the outside of the threaded column on the other hand. The side plate 72 and the limiting groove 29 cooperate with each other to prevent the clamping member 7 from rotating during the tightening of the nut.

[0024] like Figures 2-4 As shown, the bottom end of the mounting block 21 is provided with a bottom cover 3 by screws. The bottom cover 3 includes a cover plate 31. A through hole 32 is provided at the center of the cover plate 31. The through hole 32 is located directly below the cylindrical cavity and communicates with the cylindrical cavity. The inner diameter of the through hole 32 is smaller than the inner diameter of the cylindrical cavity. Based on the above, the bottom cover 3 serves two purposes: connecting the two mounting blocks 21 and sealing the permanent magnet 8, thus fixing the permanent magnet 8 inside the magnet placement slot 27. The through hole 32 allows the cylindrical cavity to communicate with the external environment, thus achieving a heat dissipation effect. When the metal ball is subjected to magnetic damping, its surface heats up, and the generated heat can be dissipated through the through hole 32.

[0025] like Figures 2-4 As shown, a metal ball 4 is disposed inside the cylindrical cavity. The metal ball 4 is made of a non-ferromagnetic material with high conductivity, preferably a sphere made of pure copper (conductivity ≥ 58 MS / m) or pure aluminum (conductivity ≥ 37 MS / m). The top of the metal ball 4 is provided with a rope 5, preferably a high-strength, low-elasticity polyamide fiber rope (breaking strength ≥500N, elongation ≤5%). The rope 5 extends along the direction of the rope guide cavity and contacts the two fixed pulleys 6 during the extension process. The end of the rope 5 away from the metal ball 4 is wrapped around the outside of the threaded column and is tightly fitted to the surface of the clamping member 7 facing the mounting housing 2. Based on the above, the vibration damping component fixes the metal ball 4 with rope 5. When the pipe body 1 vibrates, the vibration is transmitted to the rope 5. At this time, the metal ball 4 can swing under the drive of the rope 5. During the swinging process, it will cut the magnetic field lines and generate magnetic damping. The magnetic damping effect consumes and buffers the energy during vibration, thereby reducing the negative impact of vibration on the pipe body 1. like Figure 9 and Figure 10 As shown, at this time, the magnetic poles of the multiple permanent magnets 8 facing the cylindrical cavity are the same, that is, a radially uniform magnetic field. When the metal ball 4 moves in this magnetic field, it has the following characteristics: When the metal ball 4 vibrates along any radial direction, the direction of the cut magnetic field lines is uniform. However, because the magnetic field gradient is gentle (the magnetic field line density changes slowly with the radius), the number of cut magnetic field lines per unit displacement is small, and the intensity of the generated eddy current is weak. Therefore, the damping force is small. Because the magnetic field is symmetrical around the entire circle, the damping force on the metal ball 4 is basically the same in any radial direction (such as X and Y directions), and there is no "directional deviation". The eddy current intensity is weak, and the eddy current loss (electrical energy is converted into heat energy) per unit time is small. Therefore, the heating of the metal ball 4 and the magnet is not obvious. During long-term use, the magnetic field performance (such as the Curie temperature stability of neodymium iron boron magnets) is less affected by temperature, and the lifespan is longer. like Figure 11 As shown, at this time, the magnetic poles of two adjacent permanent magnets 8 facing the cylindrical cavity are opposite, that is, a radially alternating magnetic field. When the metal ball 44 moves in this magnetic field, it has the following characteristics: When the metal ball 4 vibrates, especially when it moves at the junction of adjacent magnets, it will quickly cut the "densely intersecting magnetic field lines" (short path magnetic field lines from N to S). The number of magnetic field lines cut per unit displacement is much greater than that in Scheme 1, and the intensity of the generated eddy current is significantly stronger, thus the damping force is greater. The damping force exhibits "directional fluctuations" (its strength alternates periodically with the direction of vibration), and its damping characteristics are "nonlinear" (the damping force increases sharply at small displacements, and the damping force fluctuations weaken at large displacements due to the crossing of multiple cycles, but it is still not completely linear). Its stability is weaker than that of a radially uniform magnetic field. High eddy current intensity leads to a significant increase in eddy current losses, resulting in more pronounced heating at the interface between the metal sphere 4 (especially its surface) and the magnet. High vibration frequency and large amplitude may lead to localized temperature increases with prolonged use. Therefore, this radial uniform magnetic field is suitable for environments that require high damping stability, low heat generation, and long lifespan, and it also has the characteristics of small vibration amplitude and low frequency. Radial alternating magnetic fields are suitable for environments that require strong damping forces and rapid response.

[0026] In summary, this power pipeline vibrates during grain transport. The vibration of the pipeline body 1 is transmitted to the rope 5 through the housing 2. The rope 5 drives the metal ball 4 to reciprocate within the cylindrical cavity. Because the cylindrical cavity has radially distributed permanent magnets 8, the metal ball 4 cuts the magnetic field lines generated by the permanent magnets during its movement. According to the law of electromagnetic induction, a closed eddy current loop is induced inside the metal ball. The eddy current is subjected to Ampere's force in the magnetic field. According to Lenz's law, the direction of Ampere's force is opposite to the direction of the metal ball's movement, forming a magnetic damping force. This magnetic damping force consumes the kinetic energy of the metal ball 4 (converting kinetic energy into heat energy, which is dissipated through the perforations in the bottom cover), thereby weakening the vibration energy of the pipeline body 1 and achieving a vibration reduction effect. This improved vibration reduction effect can reduce the grain breakage rate by more than 30%, while simultaneously reducing pipeline vibration noise by 10-15 dB, meeting the quality requirements of grain processing and the noise standards of workshop operations. Meanwhile, by adjusting the position of the clamping member 7, the suspension height of the metal ball 4 can be changed, and the swaying period of the metal ball 4 can be adjusted so that the natural frequency of the magnetic damping mechanism matches the vibration frequency of the pipeline (resonance principle), further improving the vibration reduction efficiency (the vibration reduction rate can be increased from the conventional 30% - 40% to 50% - 60%). This magnetic damping mechanism utilizes the principle of electromagnetic induction to achieve contactless vibration reduction, avoiding the performance degradation caused by dust and moisture in traditional vibration damping components. The vibration reduction rate remains stable at 30%-60% over a long period. It also supports two permanent magnet pole arrangements and adjustable metal ball height, adapting to different vibration frequencies (5-50Hz) and amplitudes (2-8mm) in pipeline scenarios, making it widely applicable. Furthermore, the symmetrical, split-type mounting housing allows for on-site installation without disassembling the pipeline, with an installation time of ≤30 minutes per set. The magnetic damping mechanism has no easily damaged parts (the lifespan of metal ball 4, rope 5, and permanent magnet 7 is ≥3 years), resulting in a long maintenance cycle and annual maintenance costs that are only 1 / 5 of traditional rubber vibration damping pad solutions. The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A wall-mounted power pipeline for grain transportation, characterized in that, include: Pipe body (1) and vibration damping components; The vibration damping assembly includes a mounting shell (2), which is fitted over the outside of the pipe body (1), and a magnetic damping mechanism is provided inside the mounting shell (2) to dissipate the kinetic energy of the vibration.

2. The wall-mounted power pipeline according to claim 1, characterized in that, The mounting housing (2) includes two mounting blocks (21). A semi-circular hoop (22) is provided on the top of the mounting block (21). A mounting ear (23) is provided on one end of the semi-circular hoop (22) away from the mounting block (21). Two adjacent mounting ears (23) are connected to each other by screws and nuts. The pipe body (1) is located between the two semi-circular hoops (22) and is in close contact with the surface of the opposite side of the two semi-circular hoops (22).

3. The wall-mounted power pipeline according to claim 2, characterized in that, Each of the two mounting blocks (21) has a semi-circular groove (24) on one side opposite to the other. The two semi-circular grooves (24) form a cylindrical cavity. A semi-groove (25) is provided on the surface of the semi-circular groove (24) facing the semi-circular hoop (22). The two semi-grooves (25) form a rope guiding cavity. The end of the rope guiding cavity away from the cylindrical cavity is open.

4. The wall-mounted power pipeline according to claim 3, characterized in that, On the surfaces of the two mounting blocks (21) on adjacent sides, there are protrusions (26) and semi-threaded posts (28). The two protrusions (26) are located at the opening of the rope guide cavity, and a fixed pulley (6) is provided between the two protrusions (26). A fixed pulley (6) is provided inside the end of the rope guide cavity near the cylindrical cavity. The two fixed pulleys (6) are distributed in parallel, and the two semi-threaded posts (28) cooperate with each other to form a complete threaded post.

5. The wall-mounted power pipeline according to claim 2, characterized in that, Each of the two mounting blocks (21) is provided with a limiting groove (29) on the opposite side. Both ends of the limiting groove (29) are open. The lower surface of the mounting block (21) is provided with a plurality of magnet placement grooves (27). There are an even number of magnet placement grooves (27), and they are distributed in a ring at equal intervals along the outer edge of the cylindrical cavity. A permanent magnet (8) is provided inside the magnet placement groove (27).

6. The wall-mounted power pipeline according to claim 4, characterized in that, The threaded post is fitted with a clamping member (7) and a nut. The clamping member (7) is located between the mounting block (21) and the nut. The nut is threadedly connected to the threaded post.

7. The wall-mounted power pipeline according to claim 6, characterized in that, The clamping member (7) includes a clamping plate (71), a central hole (73) is provided at the center of the clamping plate (71), the threaded post passes through the central hole (73), and side plates (72) are provided on both sides of the clamping plate (71), the side plates (72) extend into the interior of the limiting groove (29).

8. The wall-mounted power pipeline according to claim 3, characterized in that, The bottom end of the mounting block (21) is provided with a bottom cover (3) by screws. The bottom cover (3) includes a cover plate (31). A through hole (32) is provided at the center of the cover plate (31). The through hole (32) is located directly below the cylindrical cavity and is connected to the cylindrical cavity. The inner diameter of the through hole (32) is smaller than the inner diameter of the cylindrical cavity.

9. The wall-mounted power pipeline according to claim 6, characterized in that, The cylindrical cavity is provided with a metal ball (4), which is made of a non-ferromagnetic material with high conductivity.

10. The wall-mounted power pipeline according to claim 9, characterized in that, A rope (5) is provided on the top of the metal ball (4). The rope (5) extends along the direction of the rope guide cavity and contacts the two fixed pulleys (6) during the extension process. The end of the rope (5) away from the metal ball (4) is wrapped around the outside of the threaded column and is tightly attached to the surface of the clamp (7) facing the mounting housing (2).

Images