Segmented energy storage delivery threader

Abstract

The application relates to a segmented energy storage transmission type threading device, belonging to the field of construction tools, which comprises a plurality of wire segments, a spring is arranged between two adjacent wire segments, the spring can be compressed along the advancing direction of the wire segment, and the elastic force provided by the spring after compression is greater than the maximum static friction force suffered by the previous wire segment connected with the spring in a static state. The application has the effects of increasing the maximum traction length of the threading device under the same material and improving the adaptability.

Description

Technical Field

[0001] This application relates to the field of construction tool technology, and in particular to a segmented energy storage and transmission type wire puller. Background Technology

[0002] A cable puller is a tool made primarily of fiberglass reinforced plastic (FRP) and widely used in industries such as power and telecommunications to guide and pull ropes or cables in conduits or cable trays. A cable puller typically consists of two parts: a fiberglass push rod and a pulling head. It possesses good flexibility and tensile strength, enabling it to adapt to complex laying paths such as bends and narrow passages.

[0003] During use, the effective pushing length of a cable puller into a pipe is limited by the mechanical properties of its materials. As the puller extends deeper into the pipe, the cumulative length of its weight within the pipe increases, leading to a continuous increase in frictional resistance between it and the pipe wall. When the static friction of the puller exceeds the limit that its bending stiffness (structural rigidity) can withstand, continued application of thrust will not produce an axial pushing effect, but will instead cause structural deformation such as local bending, springback, or coiling of the rod, resulting in pushing failure.

[0004] As mentioned above, existing cable pullers typically have a maximum effective pushing length determined at the initial design stage. This length is mainly limited by the material stiffness of the puller, its structural design, and the frictional characteristics between the puller and the pipe. In actual use, when the required pipe length slightly exceeds the puller's maximum effective pushing length, such as when the pipe length is 20-40 meters longer than the puller's maximum effective pushing length, existing puller structures often cannot continue pushing, easily resulting in bending, springback, or coiling, leading to operation failure.

[0005] To address this issue, the traditional solution is to select a type of threader with greater propulsion capability. While this can meet the needs of operations over longer distances, this approach has the following technical limitations: existing threaders lack the ability to adjust for "critical propulsion distance" scenarios in their design structure, making it difficult to adapt to similar distance requirements, resulting in low adaptability of the threader. Utility Model Content

[0006] In order to increase the maximum pulling length of the threader made of the same material and improve its adaptability, this application provides a segmented energy storage and transmission type threader.

[0007] This application provides a segmented energy storage and transfer type cable puller. The technical solution adopted is as follows:

[0008] A segmented energy storage and transmission type wire threader includes several wire segments. A spring is provided between two adjacent wire segments. The spring can be compressed along the pushing direction of the wire segment. The elastic force provided by the spring after compression is greater than the static friction force experienced by the preceding wire segment when it is stationary.

[0009] By adopting the above technical solution, during the advancement of the cable puller, the section of wire furthest from the puller's traction head is first subjected to external thrust. Once the thrust overcomes the static friction between this section and the conduit, the section begins to move, and the static friction transforms into a smaller sliding friction. Subsequently, the thrust continues to be applied, causing the preceding section of wire to begin to bear force. Before this section starts moving, the spring between it and the preceding section is compressed, storing energy during the compression process.

[0010] When the spring force on the front segment exceeds its static friction, the rear segment also begins to move and enters the sliding friction stage. At this time, the spring in the rear segment releases its stored energy, applying an instantaneous impact force, thereby achieving coordinated propulsion of multiple wire segments. Through the dynamic process of segment-by-segment compression, release, and sliding, multiple wire segments of the threader are activated sequentially and gradually form a linked sliding state.

[0011] This structure cleverly utilizes the physical property that static friction is greater than sliding friction. Through the force transmission mechanism of "overcoming static friction segment by segment - sliding - spring pushing the next segment", it avoids the problem that traditional wire pullers need to overcome the total friction of the entire wire puller when advancing over long distances. This effectively increases the maximum effective advancing length of the wire puller under given material conditions, thereby expanding its applicable construction scenarios.

[0012] Optionally, the length of the wire segment decreases sequentially along the pushing direction, that is, the length of the wire segment near the traction head is less than the length of the wire segment away from the traction head.

[0013] By adopting the above technical solution, during the advancement of the threader, the wire segment closer to the traction head is shorter than the wire segment farther from the traction head, making it easier to start. Therefore, it is easier to be pushed and slid by the compression spring, forming a good "lead-linkage" rhythm. By setting the shorter wire segment closer to the traction head and the longer wire segment farther from the traction head, the front structure of the wire segment has stronger rigidity and less inertia. It responds quickly after being subjected to force and is not easily deformed, which helps to maintain the linear advancement path of the threader as a whole.

[0014] Optionally, the spring's stiffness coefficient decreases along the direction of application.

[0015] By adopting the above technical solution, the spring with the smallest stiffness coefficient is located near the traction head, and then the stiffness coefficient of each spring gradually increases. This ensures that each spring has a certain amount of compression before starting, further improving the rhythm coordination and propulsion stability of the threader's advancement process.

[0016] Optionally, a protective housing may be included, one end of which is fixed to the drive end of the wire segment.

[0017] By adopting the above technical solution, the protective shell is used to protect the spring from frictional contact with the inner wall of the pipe, which helps to enhance its durability; at the same time, the protective shell makes the wire segment and the spring form a whole, improving the structural integrity and stability of the device during advancement, ensuring more reliable coordinated operation of each component, and indirectly ensuring the smoothness of the threading process.

[0018] Optionally, the inner wall of the protective housing is fitted to the spring to guide the axial movement of the spring and prevent it from bending.

[0019] By adopting the above technical solution, the inner wall of the protective shell fits into the spring. The inner wall, as a guide structure for the spring, restricts the spring to move only along the axial direction of the wire segment, ensuring that the spring is always in the correct position and preventing lateral, vertical, or twisting bending or twisting during compression, thus ensuring that the wire segment moves forward stably.

[0020] Optionally, a movable block is fitted onto the other end of the spring, and a circular protrusion is provided on the movable block. The spring is in contact with the circular protrusion, and when the spring is in its natural state, the circular protrusion abuts against the inner end wall of the protective shell.

[0021] By adopting the above technical solution, the circular protrusion cooperates with the protective shell, and the protective shell limits the circular protrusion. When the wire puller is pulled back, it forms overload protection, limits the spring's stretching stroke, prevents the spring from being stretched beyond its elastic limit and causing plastic deformation, ensures that the spring always maintains stable elastic performance, and extends its service life.

[0022] Optionally, the protective housing has a guide hole at one end near the driven end of the wire segment. The guide hole is opened along the length direction of the protective housing. A guide post is provided on the moving block near the guide hole. One end of the guide post passes through the guide hole and the guide post can move along the guide hole.

[0023] By adopting the above technical solution, during the threading process, the guide post is restricted to radial movement within the guide hole, preventing relative rotation of each wire segment, thereby eliminating the tendency of wire twisting segment by segment and ensuring that the threader always passes smoothly through the threading pipe.

[0024] Optionally, the protective housing includes a top cover and a housing body, with the top cover and the housing body being snap-fitted together.

[0025] By adopting the above technical solution, the shell cover and the shell body are connected by a snap-fit, which is convenient to disassemble. The moving block can be directly removed by opening the shell cover, which simplifies maintenance operations and facilitates the inspection, replacement or maintenance of the moving block and internal related structures, effectively improving the maintenance efficiency of the equipment.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. During the advancement of the cable puller, the cable segment furthest from the puller's traction head is initially subjected to external thrust. Once the thrust overcomes the static friction between this segment and the conduit, the segment begins to move, and the static friction transforms into a smaller sliding friction. Subsequent thrust application causes the preceding cable segment to begin bearing force. Before this segment starts moving, the spring between it and the preceding segment is compressed, storing energy during this compression. When the spring force on the preceding segment exceeds its static friction, the following segment also begins to move and enters the sliding friction stage. At this point, the spring in the following segment releases its stored energy, applying a momentary impact force, thus achieving coordinated advancement of multiple cable segments. Through this dynamic process of segmental compression, release, and sliding, multiple cable segments of the cable puller are sequentially activated and gradually form a linked sliding state.

[0028] This structure cleverly utilizes the physical property that static friction is greater than sliding friction. Through the force transmission mechanism of "overcoming static friction segment by segment - sliding - spring pushing the next segment", it avoids the problem that traditional wire pullers need to overcome the total friction of the entire wire puller when advancing over long distances. This effectively increases the maximum effective advancing length of the wire puller under given material conditions, thereby expanding its applicable construction scenarios.

[0029] 2. During the threader's advancement process, the wire segment near the traction head is shorter than the segment far from the traction head, and the spring stiffness coefficient is smaller, which makes the threader's advancement response faster and less prone to deformation. This helps maintain the overall linear advancement path of the threader, improves the coordination of advancement rhythm and advancement stability.

[0030] 3. The protective shell protects the spring from frictional contact with the inner wall of the pipe, thus enhancing its durability. The protective shell makes the wire segment and the spring a whole, improving the structural integrity and stability of the device during advancement, ensuring more reliable coordinated operation of each component, and indirectly ensuring the smoothness of the threading process. At the same time, the fit between the inner wall of the protective shell and the spring restricts the spring to axial displacement along the wire segment, keeping the spring in the correct position and preventing lateral, vertical, or twisting bending or twisting during compression, thus ensuring the stable forward advancement of the wire segment.

[0031] 4. The circular protrusion cooperates with the protective shell, and the protective shell limits the circular protrusion. When the wire puller is pulled back, it forms overload protection, limits the spring's extension stroke, and prevents the spring from being stretched beyond its elastic limit and causing plastic deformation. This ensures that the spring always maintains stable elastic performance and extends its service life.

[0032] 5. The shell cover and the shell body are connected by a snap-fit, which makes disassembly convenient. The moving block can be directly removed by opening the shell cover, which simplifies maintenance operations and facilitates the inspection, replacement or maintenance of the moving block and internal related structures, effectively improving the maintenance efficiency of the equipment. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0034] Figure 2 yes Figure 1 An enlarged schematic diagram of part A in the middle.

[0035] Figure 3 yes Figure 1 Enlarged schematic diagram of part B.

[0036] Figure 4 This is a schematic cross-sectional view illustrating the structure of the spring and the protective housing in an embodiment of this application.

[0037] Explanation of reference numerals in the attached drawings: 1. Wire segment; 2. Spring; 3. Protective housing; 31. Housing cover; 32. Housing body; 33. Guide hole; 4. Moving block; 41. Circular protrusion; 42. Guide post. Detailed Implementation

[0038] The following is in conjunction with the appendix Figures 1-4 This application will be described in further detail.

[0039] This application discloses a segmented energy storage and transmission type threader.

[0040] like Figure 1 and Figure 2The device includes several wire segments 1, the length of which decreases sequentially along the pushing direction. The wire segment 1 closest to the traction head is the shortest, and the wire segment 1 furthest from the traction head is the longest. A spring 2 and a moving block 4 are provided between two adjacent wire segments 1. The spring 2 closest to the traction head has the smallest stiffness coefficient, and the spring 2 furthest from the traction head has the largest stiffness coefficient. The spring 2 can be compressed along the pushing direction of the wire segment 1. The elastic force provided by the compressed spring 2 is greater than the static friction force experienced by the wire segment 1 connected to it. One end of the spring 2 is fixed to the driving end of the wire segment 1, and the other end of the spring 2 is sleeved on the moving block 4. The other end of the moving block 4 is fixedly connected to the driven end of another wire segment 1. A circular protrusion 41 is provided on the moving block 4, and the spring 2 is connected to the circular protrusion 41. A guide post 42 is provided between the circular protrusion 41 and the spring 2 on the moving block 4.

[0041] In this embodiment, for example, the threader is 200 meters long, and the wire segments 1 from the push end to the pull head are the first wire segment 1, the second wire segment 1, the third wire segment 1, and the fourth wire segment 1, with lengths of 80 meters, 60 meters, 40 meters, and 20 meters, respectively. The springs 2 from the push end to the pull head are the first spring 2, the second spring 2, and the third spring 2, with stiffness coefficients of k1, k2, and k3, respectively, where k1>k2>k3. The annular protrusion 41 is located in the middle of the moving block 4, and the spring 2 is in contact with the annular protrusion 41.

[0042] In other embodiments, the lengths of each wire segment 1 can be equal, the stiffness coefficients of each spring 2 can be consistent, the annular protrusion 41 can be located at other positions of the moving block 4, and the spring 2 and the annular protrusion 41 can be fixedly connected.

[0043] like Figure 1 , Figure 3 and Figure 4A protective housing 3 is fixedly connected to the drive end of wire segment 1. The protective housing 3 includes a top cover 31 and a cylindrical body 32. The cylindrical body 32 is fixedly connected to the drive end of wire segment 1. The top cover 31 and the cylindrical body 32 are connected by a snap-fit. The moving block 4 passes through the top cover 31 and extends into the cylindrical body 32. Both the moving block 4 and the protective housing 3 are cylindrical. The moving block 4 moves coaxially with the protective housing 3. When the spring 2 is in its natural state, the annular protrusion 41 abuts against the inner end wall of the top cover 31. When the wire segment 1 is pulled back, the wire segment 1 drives the moving block 4 to move. When the moving block 4 moves, the protective shell 3 moves, and the protective shell 3 pulls the other wire segment 1 back. Since the inner end wall of the shell cover 31 is in contact with the annular protrusion 41, the spring 2 will not be stretched. The inner wall of the shell body 32 fits the spring 2 so that the spring 2 can only move axially. A guide hole 33 is provided at one end of the shell body 32 near the moving end of the wire segment 1. The guide hole 33 extends from the shell body 32 to the shell cover 31. The guide hole 33 is opened along the length direction of the shell body 32. One end of the guide post 42 passes through the guide hole 33 and moves along the guide hole 33.

[0044] The implementation principle of this application embodiment is as follows: During the threader's advancement process, the first section of wire 1 is first subjected to external thrust. When the applied thrust is sufficient to overcome the static friction of the first section of wire 1, the static friction suddenly changes into a smaller sliding friction, and the first section of wire 1 begins to move. At this time, the first spring 2 begins to be compressed.

[0045] As the applied thrust increases, the first spring 2 is continuously compressed and stores energy. When the elastic force of the first spring 2 is sufficient to overcome the static friction of the second wire segment 1, the elastic potential energy of the first spring 2 is released, generating an instantaneous thrust to push the second wire segment 1 to start moving. At the same time, the static friction suddenly changes into sliding friction, and the first wire segment 1, the second wire segment 1, and the first spring 2 move together. At this time, the second spring 2 begins to compress.

[0046] Then, as the external thrust continues to increase, the second spring 2 is continuously compressed to store energy. When the second spring 2 is compressed to the point where the elastic force is sufficient to overcome the static friction of the third wire segment 1, the elastic potential energy of the second spring 2 is released, generating an instantaneous thrust to push the third wire segment 1 to start moving. At the same time, the static friction force suddenly changes into sliding friction force. While the first spring 2 and the second spring 2 remain compressed, the first wire segment 1, the second wire segment 1, the third wire segment 1, the first spring 2, and the second spring 2 move together.

[0047] As the external thrust is further increased, the third spring 2 is continuously compressed and stored energy. When the elastic force of the third spring 2 is sufficient to overcome the static friction of the fourth wire segment 1, the elastic potential energy of the third spring 2 is released, generating an instantaneous thrust to push the fourth wire segment 1 to start moving. At the same time, the static friction suddenly changes into sliding friction. At this time, all wire segments 1 and spring 2 move synchronously and enter a stable driving state.

[0048] During the pushing process, assuming that the maximum static friction force on the entire 200-meter threader is 1000N, the sliding friction force is 850N, and the bending critical force is 950N, if the existing threader structure is used, the threader cannot be pushed further after 200 meters because when the static friction force increases beyond its bending critical force, the threader will bend and coil locally.

[0049] However, by pushing the 200-meter cable puller in segments, compared to the original 200-meter cable puller in one continuous section, the first segment of the cable 1 is pushed to overcome static friction, changing from static friction to sliding friction. At the same time, the first spring 2 is squeezed, and the pushing force of the first spring 2 pushes the second segment of the cable 1 to overcome static friction and begin to move, forming segment-by-segment sliding. This process is repeated, and only the sliding friction of the entire cable puller needs to be overcome. This not only enables the cable puller to be pushed in a total length of 200 meters, but also ensures that the sliding friction will not exceed the bending critical force and cause bending deformation only when the length of the cable puller increases to 230-240 meters.

[0050] Furthermore, when the length of the threader is within 200 meters, it is not necessary to apply a pushing force greater than the static friction of the entire threader; instead, only the sliding friction of the entire length needs to be applied to push it, which is more labor-saving.

[0051] Utilizing the physical property that static friction is greater than sliding friction, the force transmission mechanism of "overcoming static friction segment by segment - sliding - spring 2 pushing the next segment" effectively increases the maximum effective pushing length of the threader under given material conditions, thereby expanding its applicable construction scenarios.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A segmented energy storage and transmission type cable threader, characterized in that: It includes several wire segments (1), and a spring (2) is provided between two adjacent wire segments (1). The spring (2) can be compressed along the pushing direction of the wire segment (1). The elastic force provided by the spring (2) after compression is greater than the maximum static friction force experienced by the previous wire segment (1) when it is stationary.

2. The segmented energy storage and transmission type wire threader according to claim 1, characterized in that: The length of the wire segment (1) decreases sequentially along the pushing direction.

3. The segmented energy storage and transmission type wire threader according to claim 1, characterized in that: The spring (2) has a stiffness coefficient that decreases along the direction of the push.

4. The segmented energy storage and transmission type wire threader according to claim 1, characterized in that: It includes a protective housing (3), one end of which is fixed to the drive end of the wire segment (1).

5. The segmented energy storage and transmission type wire threader according to claim 4, characterized in that: The inner wall of the protective shell (3) is fitted with the spring (2).

6. The segmented energy storage and transmission type wire threader according to claim 4, characterized in that: The other end of the spring (2) is fitted with a movable block (4), and the movable block (4) is provided with a circular protrusion (41). The spring (2) is in contact with the circular protrusion (41). When the spring (2) is in its natural state, the circular protrusion (41) abuts against the inner end wall of the protective shell (3).

7. The segmented energy storage and transmission type wire threader according to claim 6, characterized in that: The protective shell (3) has a guide hole (33) at one end near the driven end of the wire segment (1). The guide hole (33) is opened along the length direction of the protective shell (3). A guide post (42) is provided on the moving block (4) near the guide hole (33). One end of the guide post (42) passes through the guide hole (33) and the guide post (42) can move along the guide hole (33).

8. The segmented energy storage and transmission type wire threader according to claim 4, characterized in that: The protective shell (3) includes a shell cover (31) and a shell body (32), and the shell cover (31) and the shell body (32) are snap-fitted together.

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