Steel strand pulling device and working method thereof

Abstract

The invention discloses a steel strand pulling device and a working method thereof, and relates to the technical field of engineering construction.The steel strand pulling device comprises two limiting blocks which are symmetrically arranged, two sets of self-adaptive wire pulling mechanisms which are arranged in the same direction at a fixed distance are installed in the middles of the two limiting blocks, and each self-adaptive wire pulling mechanism comprises a wire guiding pipe, a steel strand penetrates through the middle of the wire guiding pipe, and the wire guiding pipe is connected with the wire guiding pipe; three limiting balls which are sequentially distributed in the axial direction are assembled in the pipe in a sliding mode. The connecting sleeve can slide along the outer surface of the lead tube, and one end of the connecting sleeve is fixedly connected with the conical sleeve; through the arrangement of the self-adaptive wire pulling mechanism, self-adaptive adaptation of steel strands with different diameters is achieved, the slope structure of the conical sleeve can automatically adapt to the position of the limiting ball body in the push-pull process, and strand pulling operation of the steel strands with different diameters can be completed without replacing any assembly; the limitation that an existing device has one function is effectively solved, and the universality and construction flexibility of the device are greatly improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of engineering construction technology, specifically to a steel strand threading device and its working method. Background Technology

[0002] In large-scale engineering projects such as bridges, buildings, and water conservancy, steel strands, as key load-bearing components, are widely used in prestressed structural systems. Their core function is to enhance the structure's load-bearing capacity, crack resistance, and overall stability by applying prestress, ensuring the long-term safe service of the project. The steel strand threading operation, as one of the core procedures in prestressed construction, involves precisely threading the steel strands into pre-designed corrugated pipes or ducts, laying the foundation for subsequent tensioning and anchoring processes. The efficiency and quality of this operation directly determine the progress of the entire prestressed construction and the final structural stress effect.

[0003] Existing wire threading devices often employ fixed-size locking mechanisms, adaptable only to single-specification steel strands. When encountering minor diameter deviations in the steel strands (such as diameter fluctuations due to production errors) or when threading strands of different diameters, frequent replacement of locking components is necessary. This not only increases operational procedures and time costs but may also affect threading accuracy and locking reliability due to installation errors after component replacement, failing to meet the diverse steel strand specifications required in engineering projects. Furthermore, the threading process is prone to backlash and interference: traditional wire threading devices lack coordination between loosening and locking actions. During push-pull switching, the locking mechanism's constraint on the steel strand is prone to temporary failure, causing the steel strand to backlash. Especially when threading long distances or curved channels, backlash not only disrupts the threading rhythm but may also cause secondary friction between the steel strand and the channel wall, resulting in surface damage to the steel strand or channel blockage. In severe cases, the channel must be cleaned and reworked, significantly reducing construction efficiency. Summary of the Invention

[0004] To overcome the above-mentioned defects, the present invention provides a steel strand threading device and its working method to solve the problems existing in the background art.

[0005] According to one aspect, at least one embodiment of the present invention provides a steel strand threading device, comprising: two symmetrically arranged limiting blocks, and two sets of adaptive wire pulling mechanisms arranged in the same direction and at fixed intervals installed in the middle of the two limiting blocks, wherein the adaptive wire pulling mechanism specifically includes: The lead tube has a steel strand running through its middle section, and three limiting balls are slidably assembled inside the tube and distributed sequentially along the axial direction. The connecting sleeve can slide along the outer surface of the lead tube, and one end of it is fixedly connected to the tapered sleeve. By connecting the sleeve and driving the tapered sleeve to slide along the surface of the lead tube, the self-adaptive locking of the three limiting balls can be achieved.

[0006] For example, in a steel strand threading device provided in at least one embodiment of the present invention, the inner side of the conical sleeve is provided with an inclined structure and the diameter of the inclined surface gradually decreases along the axial direction, and the limiting ball is adapted to be disposed in the inner space of the conical sleeve.

[0007] For example, in at least one embodiment of the present invention, a steel strand threading device further includes: the adaptive wire pulling mechanism further includes: The movable block can slide along the inner groove of the two limiting blocks, and its interior is fixedly connected to the connecting sleeve. The slide rail is fixedly connected to the outer surface of the lead tube, and limit plates are fixedly installed around the surface of the slide rail; The sliding plate is slidably connected to the slide rail, and one end of it is fixedly connected to the inner wall of the connecting sleeve. The movable plate is slidably assembled in the groove opened inside the lead tube, and one end of it is fixedly connected to the outer surface of the limiting ball.

[0008] For example, in a steel strand threading device provided in at least one embodiment of the present invention, a limiting post is fixedly assembled in the sliding groove opened on the inner side of the limiting block, a sliding block is slidably sleeved on the outer surface of the limiting post, and one end of the sliding block is fixedly connected to the surface of the moving block. The sliding block slides within a groove located in the middle of the inner side of the limiting block.

[0009] According to another aspect, at least one embodiment of the present invention also provides a steel strand threading device, comprising: a protective shell fixedly covering the outer sides of both of the limiting blocks, an auxiliary pulley rotatably connected inside the protective shell, and a linkage belt in frictional engagement wound around the auxiliary pulley.

[0010] For example, in a steel strand threading device provided in at least one embodiment of the present invention, a second connecting plate is fixedly connected to one end of the linkage belt. The second connecting plate can slide along the groove on the bottom side of the limiting block, and one end of the second connecting plate is fixedly connected to the surface of one of the moving blocks. The other end of the linkage belt is fixedly connected to a connecting plate, which can slide along the groove on the top side of the limiting block, and one end of the connecting plate is fixedly connected to the surface of another set of moving blocks.

[0011] For example, in a steel strand threading device provided in at least one embodiment of the present invention, a positioning plate is fixedly connected to both ends of the two limiting blocks. One of the positioning plates is fixedly fitted with a connecting buckle 2 on its inner side; One of the movable blocks is fixedly fitted with a connecting buckle one, and the connecting buckle one and the connecting buckle two are connected by a hook and a compression spring nested together.

[0012] For example, in at least one embodiment of the present invention, a steel strand threading device is provided, which further includes a reciprocating push mechanism on a set of adaptive wire pulling mechanisms away from the compression spring, thereby realizing the reciprocating sliding of the moving block.

[0013] As a further aspect of the present invention: the reciprocating driving mechanism includes: The limiting frame consists of two symmetrically fixed pieces on the surfaces of the two limiting blocks; The reciprocating rod slides through the middle of the two limiting frames, and one end of it is fixedly connected to the surface of one of the moving blocks. A fixed frame is fixedly connected to the surface of two limit frames, and a motor for driving the turntable is fixedly mounted on the fixed frame; The positioning block is fixedly connected to the middle of the reciprocating rod, and a sliding column is slidably connected in the groove inside it; The threaded screw is rotatably connected to the middle of the turntable and is threadedly connected to one end of the sliding column; The knob is fixedly connected to one end of the threaded screw; The guide plate is fixedly connected to the other end of the positioning block; One end of the sliding column is slidably adapted to the groove opened in the turntable; the guide plate is slidably connected to the surface of the positioning block.

[0014] According to another aspect, at least one embodiment of the present invention also provides a method for threading steel strands, comprising: The steel strands are passed sequentially through the middle of the two positioning plates and the middle of the two sets of adaptive wire pulling mechanisms to complete the initial threading; The reciprocating drive mechanism is activated and set so that one set of adaptive wire pulling mechanisms applies a thrust to the steel strand, while the other set of adaptive wire pulling mechanisms applies a tension to the steel strand simultaneously, thus achieving coordinated drive. Rotating the threaded screw in the reciprocating drive mechanism adjusts the position of the sliding column through the threaded engagement, thereby achieving precise adjustment of the strand threading length.

[0015] The beneficial effects of the embodiments of the present invention are as follows: In this invention, the adaptive pull-wire mechanism enables adaptive adaptation to steel strands of different diameters. Furthermore, the inclined structure of the conical sleeve can automatically adapt to the position of the limiting ball during the push-pull process. The threading operation of steel strands of different diameters can be completed without replacing any components, effectively solving the limitation of existing devices that are used for only one purpose, and greatly improving the versatility and construction flexibility of the device. This invention optimizes the push-pull action logic of the adaptive wire pulling mechanism to achieve precise coordination of loosening and locking. When pushed forward, the conical sleeve moves to its maximum diameter, and the limiting ball is in a relaxed state, which can freely adapt to changes in the diameter of the steel strand, ensuring smooth forward movement of the steel strand. When pulled backward, the conical sleeve moves backward, and its inclined surface compresses the limiting ball, causing the ball to lock the steel strand, effectively preventing the steel strand from retracting during the threading process, reducing frictional damage between the steel strand and the channel, and ensuring construction continuity. This invention utilizes a linkage structure of auxiliary pulleys, a linkage belt, and a connecting plate to enable two sets of adaptive wire pulling mechanisms to achieve synchronous relative motion. When one set of mechanisms pushes forward, the other set of mechanisms pulls backward through the linkage belt. The two sets of mechanisms form a synergistic driving force, which significantly improves the traction capacity for large-diameter, long-distance steel strands, solves the problem of insufficient driving power in traditional single-set systems, increases the wire threading speed, and greatly shortens the construction cycle. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of the present invention and these drawings without any creative effort.

[0017] Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 This is a partial structural diagram of the present invention. Figure 1 ; Figure 3 This is a schematic diagram of the internal structure of the protective outer shell in this invention; Figure 4 This is a schematic diagram of the internal structure of the limiting block in this invention; Figure 5 This is a three-dimensional structural diagram of the reciprocating drive mechanism in this invention; Figure 6 This is a cross-sectional structural schematic diagram of the reciprocating drive mechanism in this invention; Figure 7 This is a partial structural diagram of the present invention. Figure 2 ; Figure 8 This is a cross-sectional structural diagram of the two sets of adaptive wire-pulling mechanisms in this invention; Figure 9 This is a cross-sectional structural schematic diagram of one set of adaptive wire-pulling mechanisms in this invention; Figure 10 yes Figure 9 Enlarged view of point A in the middle; Figure 11This is a partial cross-sectional structural diagram of the adaptive wire-pulling mechanism in this invention.

[0018] In the diagram: 1. Limiting block; 2. Positioning plate; 3. Adaptive pull-wire mechanism; 30. Moving block; 31. Lead wire tube; 32. Conical sleeve; 33. Connecting sleeve; 34. Limiting ball; 35. Slide rail; 36. Sliding plate; 37. Limiting plate; 38. Moving plate; 4. Reciprocating push mechanism; 40. Limiting frame; 41. Reciprocating rod; 42. Fixed frame; 43. Motor; 44. Turntable; 45. Positioning block; 46. Threaded screw; 47. Sliding column; 48. Guide plate; 49. Knob; 5. Protective shell; 6. Steel strand; 7. Connecting buckle one; 8. Compression spring; 9. Connecting buckle two; 10. Auxiliary pulley; 11. Linkage belt; 12. Connecting plate one; 13. Connecting plate two; 14. Limiting column; 15. Sliding block. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it.

[0020] To keep the drawings concise, each drawing only schematically shows the parts relevant to the invention; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0021] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0023] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0024] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0025] Example 1 like Figures 8-11 As shown, a steel strand threading device according to an embodiment of the present invention is illustrated, comprising: two symmetrically arranged limiting blocks 1, and two sets of adaptive wire pulling mechanisms 3 arranged in the same direction and at fixed intervals installed in the middle of the two limiting blocks 1. The adaptive wire pulling mechanism 3 specifically includes: The lead tube 31 has a steel strand 6 running through its middle section, and three limiting balls 34 are slidably assembled inside the tube and distributed sequentially along the axial direction. The connecting sleeve 33 can slide along the outer surface of the lead tube 31, and one end of it is fixedly connected to the tapered sleeve 32. By connecting the sleeve 33 and driving the tapered sleeve 32 to slide along the surface of the lead tube 31, the self-adaptive locking of the three limiting balls 34 can be achieved.

[0026] Preferably, the inner side of the conical sleeve 32 is provided with an inclined surface structure, and the diameter of the inclined surface gradually decreases along the axial direction, and the limiting ball 34 is adapted to be disposed in the inner space of the conical sleeve 32.

[0027] Preferably, the adaptive draw mechanism 3 further includes: The movable block 30 can slide along the inner groove of the two limiting blocks 1, and its interior is fixedly connected to the connecting sleeve 33. The slide rail 35 is fixedly connected to the outer surface of the lead tube 31, and the slide rail 35 is fixedly fitted with limit plates 37 around its surface. The sliding plate 36 is slidably connected to the slide rail 35, and one end of it is fixedly connected to the inner wall of the connecting sleeve 33. The movable plate 38 is slidably assembled in the groove opened inside the lead tube 31, and one end of it is fixedly connected to the outer surface of the limiting ball 34.

[0028] Preferably, each of the grooves opened on the inner side of the limiting block 1 is fixedly equipped with a limiting post 14, and a sliding block 15 is slidably sleeved on the outer surface of the limiting post 14, and one end of the sliding block 15 is fixedly connected to the surface of the moving block 30. The sliding block 15 slides in the groove opened in the middle of the inner side of the limiting block 1.

[0029] In some examples, when the moving block 30, along with the sliding block 15, moves forward along the inner groove of the limiting block 1 and the limiting post 14, the moving block 30, along with the connecting sleeve 33 and the conical sleeve 32, moves forward along the slide rail 35 via the sliding plate 36. The maximum diameter of the inner inclined surface of the conical sleeve 32 moves to the point of contact with the limiting ball 34. The sliding plate 36 moves to the front end of the slide rail 35. The sliding plate 36 pushes the limiting plate 37 and moves forward along the slide rail 35 and the lead tube 31. The lead tube 31 moves forward along with the three axially distributed limiting balls 34 inside. The three limiting balls 34 move forward along the surface of the inner steel strand 6. At this time, the three limiting balls 34 are at the maximum diameter inside the conical sleeve 32 and have a certain upward movement space. When the diameter of the three limiting balls 34 increases as they move along the surface of the steel strand 6, the limiting balls 34, along with the moving plates 38 on both sides, move upward along the inner groove of the lead tube 31 to adjust the height. When the moving block 30, along with the sliding block 15, moves backward along the inner groove of the limiting block 1 and the limiting post 14, the moving block 30, along with the connecting sleeve 33 and the conical sleeve 32, moves backward along the slide rail 35 via the sliding plate 36. The conical sleeve 32 moves backward, causing the inclined surface of the conical sleeve 32 to compress the three limiting balls 34. The three limiting balls 34 move downward along the inner groove of the lead tube 31 via the moving plates 38 on both sides, thereby locking the inner steel strand 6. The moving block 30, along with the connecting sleeve 33 and the conical sleeve 32, continues to move backward along the limiting post 14 and the groove via the sliding block 15, so that the steel strand 6 locked with the three limiting balls 34 is pulled backward for threading. The adaptive wire pulling mechanism 3 can make certain adaptive adjustments according to the change in the diameter of the steel strand 6 in the lead tube 31, and can coordinate the loosening and locking during the pushing and pulling process to avoid interference caused by retraction during the threading process.

[0030] It should be noted that in this embodiment, the reference is moved forward or backward. Figure 9 From left to right is front, and from right to left is back.

[0031] Example 2 like Figures 1-7 As shown, it illustrates a steel strand threading device in another embodiment of the present invention. The outer sides of the two limiting blocks 1 are fixedly covered with protective shells 5. The interior of the protective shells 5 is rotatably connected with auxiliary pulleys 10, and the auxiliary pulleys 10 are wound with a linkage belt 11 in friction engagement. Preferably, one end of the linkage belt 11 is fixedly connected to a connecting plate 2 13, which can slide along the groove on the inner bottom side of the limiting block 1, and one end of the connecting plate 2 13 is fixedly connected to the surface of one of the moving blocks 30. The other end of the linkage belt 11 is fixedly connected to a connecting plate 12. The connecting plate 12 can slide along the groove on the top side of the limiting block 1, and one end of the connecting plate 12 is fixedly connected to the surface of another set of moving blocks 30.

[0032] Preferably, both ends of the two limiting blocks 1 are fixedly connected to positioning plates 2; One of the positioning plates 2 has a connecting buckle 2 9 fixedly installed on its inner side; One side of one set of movable blocks 30 is fixedly equipped with a connecting buckle 7, and the connecting buckle 7 and the connecting buckle 9 are connected by a hook and a compression spring 8.

[0033] Preferably, a reciprocating push mechanism 4 is provided on a set of adaptive pull wire mechanisms 3 that are far away from the compression spring 8, and the reciprocating push mechanism 4 is used to realize the reciprocating sliding of the moving block 30.

[0034] Preferably, the reciprocating drive mechanism 4 of this invention includes: The limiting frame 40 has two pieces that are symmetrically fixed to the surfaces of the two limiting blocks 1; The reciprocating rod 41 is slidably inserted through the middle of the two limiting frames 40, and one end of it is fixedly connected to the surface of one of the moving blocks 30. A fixed frame 42 is fixedly connected to the surface of two limit frames 40, and a motor 43 for driving the turntable 44 is fixedly mounted on the fixed frame 42. The positioning block 45 is fixedly connected to the middle of the reciprocating rod 41, and a sliding column 47 is slidably connected in the groove inside it. The threaded screw 46 is rotatably connected to the middle of the turntable 44 and is threadedly connected to one end of the sliding column 47; Knob 49 is fixedly connected to one end of threaded screw 46; The guide plate 48 is fixedly connected to the other end of the positioning block 45; One end of the sliding column 47 is slidably fitted into the groove opened in the turntable 44; the guide plate 48 is slidably connected to the surface of the positioning block 45.

[0035] In some examples, a motor 43 is set up, and the output end of the motor 43 drives the turntable 44 to rotate along the middle of the fixed frame 42. The turntable 44 drives the threaded screw 46 and the sliding column 47 to rotate. The sliding column 47 moves back and forth along the slide groove in the positioning block 45. As the sliding column 47 rotates with the turntable 44, it drives the positioning block 45 and the reciprocating rod 41 connected to it to move back and forth along the middle of the two limit frames 40, thereby realizing the pushing and pulling of a set of adaptive pull wire mechanism 3. When it is necessary to adjust the swing amplitude, turn the knob 49. The output end of the knob 49 rotates the threaded screw 46, causing the sliding column 47 to move along the groove opened between the threaded screw 46 and the turntable 44. Adjust the distance of the sliding column 47 from the center, thereby adjusting the swing amplitude of the positioning block 45 and the reciprocating rod 41 with a set of adaptive pull wire mechanism 3 moving block 30. When the moving block 30 of one set of adaptive wire pulling mechanisms 3 moves forward with the reciprocating rod 41, it moves forward along the bottom slide groove of the limiting block 1 along the connecting plate 13. The other end of the connecting plate 13 moves forward along the limiting post 14 along the sliding block 15 along the moving block 30. At this time, the three limiting balls 34 in this set of adaptive wire pulling mechanisms 3 remain in a loose state on the surface of the steel strand 6. The connecting plate 13 pulls the linkage belt 11, causing the linkage belt 11 to rotate along the auxiliary pulley 10. The other end of the linkage belt 11 moves along the top slide groove along the connecting plate 12 and pulls the moving block 30 of another set of adaptive wire pulling mechanisms 3 backward, causing the moving block 30 of the other set of adaptive wire pulling mechanisms 3 to move backward along the limiting post 14 through the sliding block 15 and compress the compression spring 8. At this time, the three limiting balls 34 in this set of adaptive wire pulling mechanisms 3 remain in a locked state and thread the steel strand 6 backward. When the moving block 30 of one set of adaptive wire pulling mechanisms 3 moves backward with the reciprocating rod 41, it moves the connecting plate 2 13 backward along the bottom slide groove of the limiting block 1. The other end of the connecting plate 2 13 moves the moving block 30 backward along the limiting post 14 through the sliding block 15. At this time, the three limiting balls 34 in this set of adaptive wire pulling mechanisms 3 remain locked to the surface of the steel strand 6 and are conveyed backward. The connecting plate 2 13 remains relaxed as the linkage belt 11 moves backward and moves forward through the counter-thrust of the compression spring 8 connected to the moving block 30 in another set of adaptive wire pulling mechanisms 3, keeping the linkage belt 11 in a taut state. The other end of the linkage belt 11 moves along the top slide groove with the connecting plate 12 and moves forward through the counter-thrust of the compression spring 8 in another set of adaptive wire pulling mechanisms 3. At this time, the three limiting balls 34 in this set of adaptive wire pulling mechanisms 3 remain in a loose state. The two sets of adaptive wire pulling mechanisms 3 move synchronously relative to each other under the action of the linkage belt 11 and the compression spring 8. During the relative movement, the three limiting balls 34 in one set of adaptive wire pulling mechanisms 3 remain in a loose state on the surface of the steel strand 6, while the three limiting balls 34 in the other set of adaptive wire pulling mechanisms 3 remain in a locked state and pull the steel strand 6 backward.

[0036] It should be noted that in this embodiment, the insertion direction is referenced. Figures 1-2 The steel strand 6 is laid from right to left, with the front going from left to right and the back going from right to left.

[0037] Example 3 (used less frequently) like Figures 1-11 As shown, it illustrates a method for threading steel strands in another embodiment of the present invention, which is largely the same as the technical solution of embodiment 2, so only the differences are described.

[0038] Includes the following steps: The steel strand 6 is passed sequentially through the middle of the two positioning plates 2 and the middle of the two sets of adaptive wire pulling mechanisms 3 to complete the initial threading; Start and set the reciprocating drive mechanism 4 so that one set of adaptive wire pulling mechanism 3 applies a pushing force to the steel strand 6, and the other set of adaptive wire pulling mechanism 3 applies a pulling force to the steel strand 6 simultaneously to achieve coordinated drive; Rotating the threaded screw 46 in the reciprocating drive mechanism 4 adjusts the position of the sliding column 47 through the threaded engagement, thereby achieving precise adjustment of the strand length of the steel strand 6.

[0039] In some examples, the motor 43 is started, and the output of the motor 43 drives the turntable 44 to rotate along the middle of the fixed frame 42. The turntable 44 drives the threaded screw 46 and the sliding column 47 to rotate synchronously. The sliding column 47 moves back and forth along the inner groove of the positioning block 45. During the rotation, it pushes the positioning block 45 and the reciprocating rod 41 forward along the middle of the two limit frames 40, thereby driving the connecting plate 13 connected to it to move forward. The connecting plate 13 drives the sliding block 15 to move forward along the inner groove of the limiting block 1 and the limiting post 14, and simultaneously drives the connecting sleeve 33 and the conical sleeve 32 of the bottom adaptive pull mechanism to move forward along the slide rail 35. As described in the first embodiment "steel strand diameter adaptation adjustment operation", the three limiting balls 34 on the bottom side remain in a loose state on the steel strand 6. When the connecting plate 2 13 moves forward, it drives the connecting plate 2 13 to pull the linkage belt 11 forward along the inner bottom side slide groove of the limiting block 1. The linkage belt 11 rotates along the auxiliary pulley 10, and its other end drives the connecting plate 1 12 to move along the inner top side slide groove of the limiting block 1, thereby pulling the connecting plate 1 12 to move backward. When the connecting plate 12 moves backward, it drives the connecting sleeve 33 and the conical sleeve 32 of the top adaptive pull mechanism to move backward along the slide rail 35. As described in Embodiment 1, "Steel strand locking and threading operation", the three limiting balls 34 on the top side lock the steel strand 6. At the same time, the connecting plate 12 moves backward to compress the compression spring 8 until the top adaptive pull mechanism completes the backward threading operation with the locked steel strand 6. The motor 43 continues to run, and the turntable 44 drives the sliding column 47, the positioning block 45 and the reciprocating rod 41 to move backward, thereby driving the connecting plate 13 to move backward. The connecting plate 13 drives the sliding block 15 to move backward along the inner sliding groove of the limiting block 1 and the limiting post 14, and simultaneously drives the connecting sleeve 33 and the conical sleeve 32 of the bottom adaptive pull mechanism to move backward along the slide rail 35. As described in the first embodiment, "steel strand locking and threading operation", the three limiting balls 34 on the bottom side lock the steel strand 6, and then pull the steel strand 6 backward to complete the threading. When the connecting plate 13 moves backward, the connecting plate 13 moves backward as well, and the linkage belt 11 gradually loosens; at this time, the compressed spring 8 releases its counter-force, pushing the connecting plate 12 forward, so that the linkage belt 11 remains taut. When the connecting plate 12 moves forward, it drives the connecting sleeve 33 and the conical sleeve 32 of the top adaptive wire pulling mechanism to move forward along the slide rail 35. As described in Embodiment 1 "Steel strand diameter adaptation adjustment operation", the three limiting balls 34 on the top side remain in a loose state on the steel strand 6, in preparation for the next threading.

[0040] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A strand threading device, characterized in that The utility model relates to a kind of self-adapting cable pulling mechanism, including: Two limit blocks (1) are symmetrically arranged, and the middle part of the two limit blocks (1) is provided with two groups of self-adapting cable pulling mechanisms (3) arranged in the same direction at a distance, and the self-adapting cable pulling mechanism (3) specifically includes: A lead tube (31) is provided with a steel strand (6) penetrating through the middle part, and three limit balls (34) are slidingly assembled in the lead tube (31) along the axial direction; A connecting sleeve (33) is slidingly connected to the outer surface of the lead tube (31), and one end of the connecting sleeve (33) is fixedly connected to the conical sleeve (32). By sliding the connecting sleeve (33) along the surface of the lead tube (31), the self-adapting locking of the three limit balls (34) can be realized.

2. A strand threading device according to claim 1, characterized in that The inner side of the conical sleeve (32) is provided with a slope structure, and the diameter of the slope gradually decreases along the axial direction, and the limit ball (34) is adaptively arranged in the inner space of the conical sleeve (32).

3. A strand threading device according to claim 1, characterized in that The self-adapting cable pulling mechanism (3) further includes: A moving block (30) is slidingly connected to the inner side of the two limit blocks (1), and the inside of the moving block (30) is fixedly connected to the connecting sleeve (33); A slide rail (35) is fixedly connected to the outer surface of the lead tube (31), and a limit plate (37) is fixedly assembled around the surface of the slide rail (35); A sliding plate (36) is slidingly connected to the slide rail (35), and one end of the sliding plate (36) is fixedly connected to the inner wall of the connecting sleeve (33); A moving plate (38) is slidingly assembled in the sliding groove formed in the inner side of the lead tube (31), and one end of the moving plate (38) is fixedly connected to the outer surface of the limit ball (34).

4. A strand threading device according to claim 1, characterized in that A limit column (14) is fixedly assembled in the sliding groove formed in the inner side of the limit block (1), and a sliding block (15) is slidingly connected to the outer surface of the limit column (14), and one end of the sliding block (15) is fixedly connected to the surface of the moving block (30); The sliding block (15) is slidingly connected to the sliding groove formed in the middle part of the inner side of the limit block (1).

5. A strand threading device according to claim 1, characterized in that The outer side of the two limit blocks (1) is fixedly covered with a protective shell (5), and the inner side of the protective shell (5) is rotatably connected with an auxiliary pulley (10), and the auxiliary pulley (10) is wrapped with a linkage belt (11) in frictional connection.

6. A strand threading device according to claim 5, characterised in that One end of the linkage belt (11) is fixedly connected with a connecting plate II (13), and the connecting plate II (13) is slidingly connected to the sliding groove formed in the inner bottom side of the limit block (1), and one end of the connecting plate II (13) is fixedly connected to the surface of one of the moving blocks (30); The other end of the linkage belt (11) is fixedly connected with a connecting plate I (12), and the connecting plate I (12) is slidingly connected to the sliding groove formed in the inner top side of the limit block (1), and one end of the connecting plate I (12) is fixedly connected to the surface of the other moving block (30).

7. A strand threading device according to claim 6, characterised in that The two ends of the two limit blocks (1) are fixedly connected with a positioning plate (2); The inner side of one of the positioning plates (2) is fixedly connected with a connecting buckle II (9); One side of one of the moving blocks (30) is fixedly connected with a connecting buckle I (7), and the connecting buckle I (7) and the connecting buckle II (9) are connected in nested connection through the hook and the compression spring (8).

8. A strand threading device according to claim 1, characterized in that A reciprocating pushing mechanism (4) is arranged on the set of adaptive tensioning mechanisms (3) away from the compression spring (8), and the reciprocating pushing mechanism (4) is used to realize the reciprocating sliding of the moving block (30).

9. A strand threading device according to claim 8, characterised in that The reciprocating pushing mechanism (4) comprises: Two limiting frames (40) are symmetrically fixed to the surfaces of the two limiting blocks (1); A reciprocating rod (41) is slidably arranged in the middle of the two limiting frames (40), and one end of the reciprocating rod (41) is fixedly connected to the surface of one set of moving blocks (30); A fixed frame (42) is fixedly connected to the surfaces of the two limiting frames (40), and a motor (43) for driving a rotating disc (44) is fixedly arranged on the fixed frame (42); A positioning block (45) is fixedly connected to the middle of the reciprocating rod (41), and a sliding column (47) is slidably arranged in a sliding groove in the positioning block (45); A threaded screw rod (46) is rotatably connected to the middle of the rotating disc (44) and is in threaded connection with one end of the sliding column (47); A knob (49) is fixedly connected to one end of the threaded screw rod (46); A guide sliding plate (48) is fixedly connected to the other end of the positioning block (45); One end of the sliding column (47) is slidably arranged in the sliding groove of the rotating disc (44); and the guide sliding plate (48) is slidably connected to the surface of the positioning block (45).

10. A method of threading a steel strand (6) through a bundle, using a steel strand threading device according to any one of claims 1-9, characterized in that The method comprises the following steps: The steel strand (6) is sequentially arranged through the middle of the two positioning plates (2) and the middle of the two sets of adaptive tensioning mechanisms (3) to complete the initial arrangement; The reciprocating pushing mechanism (4) is started and set, so that one set of adaptive tensioning mechanisms (3) applies a pushing force to the steel strand (6), and the other set of adaptive tensioning mechanisms (3) simultaneously applies a pulling force to the steel strand (6) to realize cooperative driving; The threaded screw rod (46) in the reciprocating pushing mechanism (4) is rotated, the position of the sliding column (47) is adjusted through threaded connection, and the precise adjustment of the length of the steel strand (6) is realized.

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