Combined type stay wire system

Abstract

The invention relates to the technical field of power equipment, in particular to a combined type stay wire system which comprises a plurality of stay wire sections fixedly connected together in sequence, each stay wire section comprises a steel strand section and a wire clamp, and every two adjacent steel strand sections are fixedly connected together through the corresponding wire clamp. The elastic stay wire is reasonable and compact in structure, and due to the fact that an existing single stay wire is decomposed into a plurality of stay wire sections, the elastic force of the whole stay wire can be obviously reduced. When the stay wire is subjected to external force, due to the relative independence between the stay wire sections, the external force can be dispersed to each stay wire section, so that the stress degree of a single stay wire section is reduced. When the stay wire is damaged by external force of agricultural machinery and the like, because the elastic force between the stay wire sections is reduced, the stay wire cannot bounce, even if a certain stay wire section is broken, because the tensile force is dispersed, the elastic force of a single stay wire section can be obviously reduced, and the broken stay wire section and the stay wire system cannot be wound on an overhead line lead; therefore, potential safety hazards are avoided.

Description

Technical Field

[0001] The invention relates to the technical field of electric power equipment and relates to a combined wire drawing system. Background Art

[0002] Guy wires are important auxiliary facilities in power lines used to stabilize poles and towers, balance conductor tension, and resist external forces.

[0003] In power lines, conductors generate horizontal or vertical tension due to their own weight, wind loads, and ice buildup. Guy wires form a triangular load-bearing structure with the tower, transferring this tension to the ground or adjacent support points, preventing the tower from tilting or collapsing due to uneven loads. Guy wires also partially absorb impacts from external forces, such as vehicle collisions and falling trees.

[0004] The cable body is typically constructed of high-strength galvanized steel strands, which are corrosion-resistant and offer high tensile strength. However, when the cable is damaged by external forces, such as being scraped by agricultural machinery, it can be overstretched and instantly break. The free end of the cable can then bounce and become entangled in the tower. In severe cases, it can become entangled directly in the overhead line conductors, causing transmission and distribution line failures. Furthermore, due to the high strength and poor flexibility of steel strands, reconnecting broken strands with wire clips is time-consuming and labor-intensive. Summary of the Invention

[0005] The present invention provides a combined wire pulling system that overcomes the above-mentioned shortcomings of the existing technology. It can effectively solve the problem that when the existing steel strand wire pulling wire is damaged by external force, the wire will break instantly due to excessive tension, and there is a hidden danger that the broken wire will be entangled in the overhead line conductor.

[0006] The technical solution of the present invention is achieved through the following measures: a combined wire pulling system, comprising several wire pulling sections fixedly connected together in sequence, the wire pulling section comprising a steel strand section and a wire clamp, two adjacent steel strand sections are fixedly connected together by a wire clamp, the wire clamp comprises two sub-wire clamps that are symmetrically arranged and detachably fixed together, the lower sub-wire clamp comprises a clamping block, an adjusting nut, a limit piece and a shell with an inner cavity, the inner cavity of the shell is formed with a sleeve for fixing the end of the steel strand section, a plurality of limit through holes are distributed circumferentially at intervals on the outer side of the upper part of the shell, the lower part of the limit through hole is inclined inwardly relative to the upper part, and a clamping block is provided in each limit through hole, the clamping block comprises a first connecting part and a second connecting part whose upper and lower ends are fixed together, the first connecting part has a wedge-shaped structure, and an adjusting nut is screwed on the outer side of the upper part of the second connecting part, and a limit piece for limiting the axial movement of the adjusting nut is fixed on the upper side of the shell.

[0007] The following are further optimizations and / or improvements to the above technical solutions: The above-mentioned limiting member may include a first pressure ring, a second pressure ring and a limiting member. The first pressure ring is sleeved on the outer side of the upper part of the sleeve, the second pressure ring is sleeved on the outer side of the upper part of the second connecting part, and the second pressure ring is fixedly installed together with the corresponding position of the outer side of the first pressure ring. A limiting member is fixedly installed on the outer side of the sleeve corresponding to the position above the first pressure ring.

[0008] A plurality of balls may be evenly distributed along the circumference between the upper end of the adjusting nut and the lower end of the second pressure ring, and between the lower end of the adjusting nut and the upper side of the shell.

[0009] The inner side of the wedge-shaped structure may be provided with a clamping groove which opens inwards and passes through vertically.

[0010] A plurality of transversely arranged protruding teeth may be fixed on the inner wall of the clamping groove at intervals along the up and down directions.

[0011] The lower inner wall of the above-mentioned limiting through hole can be provided with a plurality of first ratchet teeth along the up-down direction, and a second ratchet tooth is provided on the outer side of the wedge-shaped structure between each adjacent two first ratchet teeth.

[0012] The outer side of the upper portion of the shell may be provided with two to four limiting through holes spaced apart along the circumferential direction.

[0013] The structure of the present invention is reasonable and compact. Since the present application decomposes the existing single wire into multiple wire sections, the elastic force of the overall wire system will be significantly reduced. When the wire system is subjected to external force, due to the relative independence between the wire sections, the external force will be dispersed to each wire section, thereby reducing the stress level of a single wire section. When the wire system is damaged by external forces such as agricultural machinery, the elastic force between the wire sections is reduced, and the wire system will not bounce. Even if a wire section breaks, the elastic force of the single wire section will be significantly reduced after the tension is dispersed, and the broken wire section and the wire system will not be entangled on the overhead line conductor, thereby avoiding safety hazards.

[0014] The present application designs a wire clamp. When the wire clamp clamps the steel strand segment, the end of the steel strand segment is inserted into the sleeve from the bottom of the shell, and the position of the clamping block is adjusted by rotating the adjusting nut, so that the wedge-shaped structure can tightly clamp the steel strand segment, and the position of the clamping block is further adjusted by adjusting the nut until the fixed clamping block completely clamps the steel strand segment and does not fall off. The sub-wire clamp comprising a shell, a clamping block, an adjusting nut and a limiter can significantly improve the connection stability and operation convenience of the combined wire pulling system. By adopting the sub-wire clamp design, it can be ensured that the wire pulling system can maintain a reliable state in various environments and the wire pulling can be easily installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Attachment Figure 1 This is a schematic diagram of the application scenario of Example 1 of the present application.

[0016] Attachment Figure 2 This is a schematic diagram of a wire clamp connection structure in Example 1 of the present application.

[0017] Attachment Figure 3 This is a schematic diagram of the three-dimensional structure of a sub-clip in Example 1 of the present application.

[0018] Attachment Figure 4 This is a schematic diagram of a sub-clamp structure in Example 1 of the present application.

[0019] Attachment Figure 5 This is a schematic diagram of the cross-sectional structure of a sub-clip in Example 1 of the present application.

[0020] Attachment Figure 6 This is a schematic diagram of a clamping block structure in Example 1 of the present application.

[0021] Attachment Figure 7 This is a schematic diagram of another clamping block structure in Example 1 of the present application.

[0022] The codes in the accompanying drawings are: 100 is a wire clamp, 110 is a shell, 111 is a limiting through hole, 120 is a sleeve, 1111 is a first ratchet, 130 is a clamping block, 131 is a first connecting part, 132 is a second connecting part, 1311 is a wedge-shaped structure, 1312 is a convex tooth, 1321 is a thread, 1313 is a second ratchet, 140 is a limiting member, 141 is a first pressure ring, 142 is a second pressure ring, 143 is a limiting member, 150 is an adjusting nut, 160 is a ball, 200 is a steel strand section, and 300 is a transmission line tower. DETAILED DESCRIPTION

[0023] The present invention is not limited to the following embodiments, and specific implementation methods can be determined based on the technical solutions of the present invention and actual conditions.

[0024] In the present invention, for the convenience of description, the relative position relationship of each component is described based on the Figure 1 The positional relationships of front, back, top, bottom, left, and right are described in the layout of the manual. Figure 1 The layout direction is determined by the

[0025] The present invention will be further described below in conjunction with the embodiments and accompanying drawings: Example 1: As shown in the attached Figures 1 to 5As shown, the combined cable pulling system includes a plurality of cable pulling sections fixedly connected together in sequence, the cable pulling section includes a steel strand section 200 and a wire clamp 100, and two adjacent steel strand sections 200 are fixedly connected together by the wire clamp 100. The wire clamp 100 includes two sub-clip sections that are symmetrically arranged and detachably fixed together. The lower sub-clip includes a clamping block 130, an adjusting nut 150, a limiter 140 and a housing 110 with an inner cavity. The inner cavity of the housing 110 is formed with a sleeve 120 for fixing the end of the steel strand section 200. There are several limiting through holes 111 distributed along the circumferential interval on the outer side of the upper part of the shell 110, and the lower part of the limiting through hole 111 is inclined inward relative to the upper part. A clamping block 130 is provided in each limiting through hole 111, and the clamping block 130 includes a first connecting part 131 and a second connecting part 132 fixed together at the upper and lower ends. The first connecting part 131 has a wedge-shaped structure 1311, and the outer side of the upper part of the second connecting part 132 is screwed with an adjusting nut 150. A limiting member 140 for limiting the axial movement of the adjusting nut 150 is fixed on the upper side of the shell 110.

[0026] The combined wire pulling system of the present application is connected between the transmission line tower 300 and the ground, and is used to stabilize the transmission line tower 300. The length of the steel strand segment 200 is designed according to actual needs, and is usually shorter to reduce the elastic force of the overall wire pulling. The wire clamp 100 is set at both ends of the steel strand segment 200, and is used to fix the adjacent steel strand segments 200 together to form a complete combined wire pulling system. The wire clamp 100 is generally made of high-strength metal material, or other high-strength polymer material or inorganic fiber material, etc.

[0027] Since the present application decomposes the existing single long guy wire into multiple guy wire sections, the elastic force of the overall guy wire system will be significantly reduced. When the guy wire system is subjected to external force, due to the relative independence between the guy wire sections, the external force will be dispersed to each guy wire section, thereby reducing the force level of a single guy wire section. When the guy wire system is damaged by external forces such as agricultural machinery, the elastic force between the guy wire sections is reduced and the guy wire system will not bounce. Even if a guy wire section breaks, the elastic force of the single guy wire section will be significantly reduced after the tension is dispersed, and the broken guy wire section and the guy wire system will not be entangled on the overhead line conductor, thereby avoiding safety hazards.

[0028] During installation, the number and length of the guying sections are determined according to actual needs, and each steel strand section 200 is assembled with the wire clamp 100 to form a complete guying section. The assembled guying sections are connected in sequence to form a combined guying system, and the combined guying system is fixed to the corresponding position of the transmission tower 300.

[0029] The combined wire pulling system of the present application effectively solves the problem that a single long wire in the existing system is prone to over-tightening, instantaneous breakage and entanglement with overhead line conductors under external force damage. At the same time, due to the relative independence between the wire pulling sections, the wire pulling system is more flexible and reliable, and is easy to install and maintain.

[0030] In order to further improve the assembly efficiency between the steel strand section 200 and the wire clamp 100, the wire clamp 100 includes two connected sub-clamps, and the connection methods of the two sub-clamps include but are not limited to hook connection, welding, threaded connection, etc. If a hook connection is adopted, the end of the sub-clamp should be a hook or a hanging ring. If a threaded connection is adopted, the end of the sub-clamp should be an internal thread or an external thread. Of course, those skilled in the art can also adopt other methods to reliably connect the two sub-clamps.

[0031] The shell 110 serves as the main structure of the sub-wire clamp, and its inner cavity forms a sleeve 120 for accommodating the end of the steel strand segment 200. The shell 110 is provided with a plurality of limiting through holes 111. The lower part of the limiting through holes 111 is inclined inward relative to the upper part. The limiting through holes 111 pass through the shell 110, so that the clamping block 130 can be inserted and set in the limiting through holes 111 of the shell 110, thereby achieving a firm clamping of the steel strand segment 200.

[0032] The clamping block 130 passes through the limiting through hole 111. The clamping block 130 includes a first connecting part 131 and a second connecting part 132, the upper and lower ends of which are fixed together, that is, the upper end of the first connecting part 131 and the lower end of the second connecting part 132 are fixed together. The first connecting part 131 is a wedge-shaped structure 1311. The side of the wedge-shaped structure 1311 facing the axis of the sleeve 120 is a vertically downward surface. The wedge-shaped structure 1311 enables the clamping block 130 to gradually clamp the steel strand section 200 as the insertion depth increases when inserted into the limiting through hole 111. The outer periphery of the second connecting part 132 is provided with a thread 1321 for threaded connection with the adjusting nut 150.

[0033] The adjusting nut 150 is threadedly connected to the outside of the second connecting part 132 of the clamping block 130. When the clamping block 130 is inserted into the limiting through hole 111 and adjusted to a suitable position, the position of the clamping block 130 can be further adjusted by tightening the adjusting nut 150, so that the clamping block 130 can firmly clamp the steel strand section 200.

[0034] The limit member 140 is fixedly mounted on the upper end of the shell 110, and the limit member 140 is located above the adjusting nut 150. The function of the limit member 140 is to limit the axial movement of the adjusting nut 150, thereby ensuring that after the adjusting nut 150 is rotated, the clamping block 130 can move axially, thereby clamping the steel strand section 200.

[0035] During use, the end of the steel strand segment 200 is inserted into the sleeve 120 from the lower part of the shell 110, and the position of the clamping block 130 is adjusted by rotating the adjusting nut 150 so that the wedge-shaped structure 1311 can tightly clamp the steel strand segment 200. The position of the clamping block 130 is further adjusted by adjusting the nut 150 until the clamping block 130 completely clamps the steel strand segment 200 and does not fall off.

[0036] In actual applications, the sub-wire clamp comprising a shell 110, a clamping block 130, an adjusting nut 150 and a limiter 140 can significantly improve the connection stability and operational convenience of the combined wire pulling system. The sub-wire clamp of the present application is particularly suitable for scenarios where high requirements are placed on the convenience of connection of the wire pulling system. By adopting the sub-wire clamp design, it can ensure that the wire pulling system can maintain a reliable state in various complex environments, and can achieve convenient installation of the wire pulling system.

[0037] The above-mentioned combined wire drawing system can be further optimized and / or improved according to actual needs: Example 2: As an optimization of the above example, as shown in the attached Figure 3 、 4 As shown in Figures 5 and 6, the limiting member 140 includes a first pressure ring 141, a second pressure ring 142 and a limiting member 143. The first pressure ring 141 is sleeved on the outer side of the upper part of the sleeve 120, and the second pressure ring 142 is sleeved on the outer side of the upper part of the second connecting portion 132. The second pressure ring 142 is fixedly installed together with the corresponding position of the outer side of the first pressure ring 141, and the limiting member 143 is fixedly installed on the outer side of the sleeve 120 corresponding to the position above the first pressure ring 141.

[0038] According to requirements, the first pressure ring 141 and the second pressure ring 142 are both circular in shape, and the inner diameter of the first pressure ring 141 is larger than the outer diameter of the sleeve 120 above the shell 110, so that the first pressure ring 141 can be directly mounted on the outside of the sleeve 120 located above the shell 110. The main function of the first pressure ring 141 is to limit the upward movement of the second pressure ring 142.

[0039] The inner diameter of the second pressure ring 142 is larger than the outer diameter of the second connecting part 132, so that the second pressure ring 142 can be directly sleeved on the outside of the second connecting part 132, and the second pressure ring 142 can constrain the adjusting nut 150, thereby limiting the axial movement of the adjusting nut 150, so that the adjusting nut 150 can adjust the axial sliding position of the clamping block 130 by rotation. The second pressure ring 142 is connected to the first pressure ring 141, and the two together constitute the main structure of the limiter 140 to achieve a limiting effect on the adjusting nut 150, preventing the adjusting nut 150 from axial movement, so that the axial position of the clamping block 130 can be adjusted by rotating the adjusting nut 150. The connection method of the second pressure ring 142 and the first pressure ring 141 can be welding, bolt connection, etc., to ensure that the connection is firm and reliable.

[0040] The upper part of the first pressure ring 141 is also provided with a limiting member 143 for limiting the upward movement of the first pressure ring 141. The limiting member 143 can be in the form of a nut, a snap, a baffle, etc., which is connected to the shell 110. By limiting the position of the first pressure ring 141, the first pressure ring 141 is prevented from moving upward when subjected to external force, thereby ensuring that the entire limit member 140 can limit the axial movement of the adjusting nut 150, ensuring that the adjusting nut 150 is always in a restricted state, so that the axial position of the clamping block 130 can be adjusted by rotating the adjusting nut 150.

[0041] Example 3: As an optimization of the above embodiment, as shown in the attached Figure 4 、 5 As shown, a plurality of balls 160 are evenly distributed along the circumference between the upper end of the adjusting nut 150 and the lower end of the second pressure ring 142 , and between the lower end of the adjusting nut 150 and the upper side of the housing 110 .

[0042] Depending on the requirements, an annular groove or a plurality of dot-shaped grooves are formed on the surfaces of the adjusting nut 150, the housing 110, and the second pressure ring 142 that are close to each other, and the balls 160 are placed in these grooves. During the rotation of the adjusting nut 150, the balls 160 can roll between the adjusting nut 150 and the housing 110, and between the adjusting nut 150 and the second pressure ring 142, converting the original sliding friction into rolling friction. The friction force of rolling friction is much smaller than that of sliding friction, making it easier for the operator to rotate the adjusting nut 150. Alternatively, conventional thrust ball bearings can be installed on the outer sides of the second connecting portion 132 at the upper and lower ends of the adjusting nut 150.

[0043] Example 4: As an optimization of the above embodiment, as shown in the attached Figure 5 、 6 As shown in FIG. 7 , a clamping groove is provided on the inner side of the wedge-shaped structure 1311 , which opens inward and passes through the upper and lower parts.

[0044] The lower part of the first connecting part 131 has a wedge-shaped structure 1311, and the wedge-shaped structure 1311 is provided with a clamping groove with an inward opening and passing through the upper and lower parts on the side facing the axis of the sleeve 120. The inner wall of the clamping groove is a curved surface around the axis of the sleeve 120. Since the steel strand segment 200 is usually composed of multiple steel wires twisted together, its surface is not a completely regular cylindrical surface. The curved inner wall can better adapt to the irregular shape of the surface of the steel strand segment 200 and increase the contact area with the steel strand segment 200. During the clamping process, the curved inner wall can fit the surface of the steel strand segment 200 more closely, thereby improving the firmness of the clamping and reducing the possibility of relative sliding of the steel strand segment 200 in the sleeve 120.

[0045] In addition, the curved inner wall of the clamping groove enables the clamping force to be more evenly distributed along the surface of the steel strand segment 200. Compared with the planar structure, the curved inner wall can avoid excessive stress concentration in local areas, preventing the surface of the steel strand segment 200 from being damaged due to stress concentration. The evenly distributed clamping force helps to improve the force-bearing performance of the steel strand segment 200 and extend its service life. When using steel strand segments 200 of different specifications, the curved inner wall of the clamping groove has a certain degree of adaptability, and its curved shape can adapt to steel strand segments 200 of different diameters to a certain extent. By adjusting the insertion depth of the clamping block 130, effective clamping of the steel strand segment 200 can still be achieved, thereby improving the versatility and adaptability of the wire clamp 100.

[0046] Example 5: As an optimization of the above embodiment, as shown in the attached Figure 5 、 7 As shown, a plurality of transversely arranged protruding teeth 1312 are fixed at intervals along the up-down direction on the inner wall of the clamping groove.

[0047] A number of transversely arranged convex teeth 1312 are provided on the curved inner wall of the clamping groove. These convex teeth 1312 are evenly distributed on the surface of the wedge-shaped structure 1311. The cross-sectional shape of the convex teeth 1312 can be rectangular, triangular, trapezoidal, etc. The specific shape can be designed according to actual needs. The height, width of the convex teeth 1312 and the spacing between adjacent convex teeth 1312 also need to be specifically set according to factors such as the material, diameter and required clamping force of the steel strand segment 200.

[0048] The transversely arranged convex teeth 1312 can significantly increase the friction between the wedge-shaped structure 1311 and the surface of the steel strand segment 200. When the clamping block 130 clamps the steel strand, the convex teeth 1312 will be embedded in the surface of the steel strand segment 200 to form a mechanical bite, which greatly increases the friction coefficient between the two, making it more difficult for the steel strand segment 200 to slide relative to the casing 120 when subjected to tension, thereby enhancing the firmness of the clamping.

[0049] The direction of the protruding tooth 1312 can also be set upward, that is, the end of the protruding tooth 1312 away from the inner wall of the clamping groove is tilted upward. When the clamping block 130 clamps the steel strand segment 200, the upward protruding tooth 1312 can further prevent the steel strand segment 200 from sliding downward or displacing when subjected to external force, thereby enhancing the stability of the clamping.

[0050] According to requirements, the first connecting part 131 is a non-cylindrical columnar structure, and the cross-section of the first connecting part 131 can be square or regular hexagonal. The advantage of the cylindrical structure of the clamping block 130 is that it is relatively simple, but there are certain limitations when clamping the steel strand section 200. The non-cylindrical columnar structure prevents the adjusting nut 150 from driving the clamping block 130 to rotate together during the rotation process, thereby ensuring that the adjusting nut 150 can effectively adjust the axial movement position of the clamping block 130.

[0051] Example 6: As an optimization of the above embodiment, as shown in the attached Figure 5 、 7 As shown, a plurality of first ratchet teeth 1111 are provided on the inner wall of the lower portion of the limiting through hole 111 along the up-down direction, and a second ratchet tooth 1313 is provided on the outer side of the wedge-shaped structure 1311 between each two adjacent first ratchet teeth 1111 .

[0052] According to the requirements, the lower part of the limiting through hole 111 is a wedge-shaped cavity, and the clamping block 130 is designed as a wedge-shaped block matching it. A downward first ratchet 1111 is set on at least one inner wall of the wedge-shaped cavity, and an upward second ratchet 1313 is set on the surface of the contact surface between the wedge block and the first ratchet 1111. The first ratchet 1111 and the second ratchet 1313 are engaged with each other. When the clamping block 130 moves downward in the wedge-shaped cavity, the first ratchet 1111 and the second ratchet 1313 are engaged with each other, which can prevent the clamping block 130 from falling off when subjected to a reverse force (such as the force of the steel strand segment 200 trying to slide downward), ensuring that the clamping block 130 always maintains effective clamping of the steel strand segment 200.

[0053] The wedge-shaped structure 1311 gradually increases the clamping force of the clamping block 130 on the steel strand segment 200 as it moves downward, better accommodating steel strand segments 200 of varying diameters and ensuring that the steel strand segment 200 is securely clamped within the limiting through-hole 111. Furthermore, the self-locking nature of the wedge-shaped structure 1311 prevents the clamping block 130 from automatically moving upward when subjected to external forces, maintaining a stable clamping force.

[0054] Example 7: As an optimization of the above embodiment, as shown in the attached Figures 2 to 5 As shown, two to four limiting through holes 111 are distributed at intervals along the circumferential direction on the outer side of the upper portion of the shell 110.

[0055] The clamping blocks 130 and the limiting through-holes 111 are evenly distributed around the axis of the sleeve 120. For example, if two clamping blocks 130 are provided, the clamping blocks 130 and the limiting through-holes 111 can be symmetrically distributed on either side of the sleeve 120. If three clamping blocks 130 are provided, they can be evenly distributed at a 120-degree angle, and so on. This even distribution ensures that the strand segment 200 is subjected to a uniform clamping force within the sleeve 120, preventing deformation or damage to the strand segment 200 due to uneven clamping force.

[0056] Multiple clamping blocks 130 clamp the strand segment 200 from different directions, providing a larger clamping area and more stable clamping compared to a single clamping block 130. When the cable tensioning system is subjected to external forces, the multiple clamping blocks 130 share the tensile force, dispersing the stress and reducing the load on a single clamping block 130, thereby improving the clamping stability and reliability of the entire cable clamp 100.

[0057] Furthermore, steel strand segments 200 of different specifications and materials may vary in diameter, surface roughness, etc. The multiple clamping blocks 130 can be adjusted based on the actual conditions of the steel strand segments 200. By adjusting the clamping force of each clamping block 130, effective clamping of steel strand segments 200 of different specifications can be achieved, thereby improving the versatility and adaptability of the wire clamp 100.

[0058] The above technical features respectively constitute the embodiments of the present invention, which have strong adaptability and implementation effect. Non-essential technical features can be added or removed according to actual needs to meet the requirements of different situations.

Claims

1. A combined wire drawing system, characterized in that It includes several tensioning sections fixedly connected together in sequence, and the tensioning section includes a steel strand section and a wire clamp. Two adjacent steel strand sections are fixedly connected together by a wire clamp. The wire clamp includes two sub-wire clamps that are symmetrically arranged and detachably fixed together. The lower sub-wire clamp includes a clamping block, an adjusting nut, a limit piece and a shell with an inner cavity. The inner cavity of the shell is formed with a sleeve for fixing the end of the steel strand section. Several limit through holes are distributed at intervals along the circumferential direction on the outer side of the upper part of the shell. The lower part of the limit through hole is inclined inwardly relative to the upper part. A clamping block is provided in each limit through hole. The clamping block includes a first connecting part and a second connecting part whose upper and lower ends are fixed together. The first connecting part has a wedge-shaped structure. The outer side of the upper part of the second connecting part is screwed with an adjusting nut. A limit piece for limiting the axial movement of the adjusting nut is fixed on the upper side of the shell.

2. The combined wire pulling system according to claim 1, characterized in that The limiting member includes a first pressure ring, a second pressure ring and a limiting member. The first pressure ring is sleeved on the outer side of the upper part of the sleeve, and the second pressure ring is sleeved on the outer side of the upper part of the second connecting part. The second pressure ring is fixedly installed together with the corresponding position of the outer side of the first pressure ring, and a limiting member is fixedly installed on the outer side of the sleeve corresponding to the position above the first pressure ring.

3. The combined wire pulling system according to claim 2, characterized in that A plurality of balls are evenly distributed along the circumference between the upper end of the adjusting nut and the lower end of the second pressure ring, and between the lower end of the adjusting nut and the upper side of the shell.

4. The combined wire drawing system according to claim 1, 2 or 3, characterized in that A clamping groove which opens inwards and passes through vertically is provided on the inner side of the wedge-shaped structure.

5. The combined wire pulling system according to claim 4, characterized in that A plurality of transversely arranged convex teeth are fixed at intervals along the up-down direction on the inner wall of the clamping groove.

6. The combined wire drawing system according to claim 1, 2, 3 or 5, characterized in that A plurality of first ratchet teeth are provided on the inner wall of the lower portion of the limiting through hole along the up-down direction, and a second ratchet tooth is provided on the outer side of the wedge-shaped structure between each two adjacent first ratchet teeth.

7. The combined wire pulling system according to claim 4, characterized in that A plurality of first ratchet teeth are provided on the inner wall of the lower portion of the limiting through hole along the up-down direction, and a second ratchet tooth is provided on the outer side of the wedge-shaped structure between each two adjacent first ratchet teeth.

8. The combined wire drawing system according to claim 1, 2, 3, 5 or 7, characterized in that Two to four limiting through holes are distributed at intervals along the circumferential direction on the outer side of the upper part of the shell.

9. The combined wire pulling system according to claim 4, characterized in that Two to four limiting through holes are distributed at intervals along the circumferential direction on the outer side of the upper part of the shell.

10. The combined wire pulling system according to claim 6, characterized in that Two to four limiting through holes are distributed at intervals along the circumferential direction on the outer side of the upper part of the shell.

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