Clamping jack and its whole bunching machine

Abstract

The utility model discloses a kind of clamping jack and its whole bundle cable threading machine, it is related to the steel strand cable threading technical field of construction, bridge cable-stayed cable construction engineering, it includes cylinder body and piston rod of one end sliding connection in the cylinder body and the other end stretches out the cylinder body outside, the end of the cylinder body that stretches out piston rod is connected with barrel clamping head, steel strand transmission channel is radially equipped in the middle of this clamping head, the piston rod stretching out end is connected with clamping fork, the clamping fork is installed in the movement channel that is axially equipped in the clamping head, the clamping head is installed with steel strand inductor, compared with prior art, the utility model realizes accurate clamping to steel strand, improve the friction with steel strand, avoid the cable threading slip, can improve the reliability of steel strand compression, also can be used for cable threading different specifications whole bundle steel strand, improve the applicability of cable threading machine.

Description

Technical Field

[0001] This utility model relates to the field of steel strand threading technology in cable-stayed engineering of buildings and bridges, and in particular to a clamping jack and a whole bundle threading machine. Background Technology

[0002] As a key piece of equipment in prestressed construction, the bundled steel strand threading machine uses mechanical power to precisely and efficiently thread bundled steel strands into precast ducts. In large-scale projects such as bridges and high-rise buildings, the application of prestressed technology is crucial, and the strand threading process directly affects project quality and progress. Compared to traditional manual threading methods—where workers use simple tools to drag the steel strands by hand, resulting in extremely high labor intensity, low efficiency, and difficulty in guaranteeing threading quality; and single-strand threading machines—which thread the steel strands one by one into the duct, prone to disordered tangling, jamming during transport, and the lack of overall guidance for individual strands, leading to deviations from the precast duct's trajectory and affecting the prestressing effect—the bundled steel strand threading machine, with its mechanized operation mode, significantly reduces the labor intensity of workers, greatly improves threading efficiency, and ensures the standardization and accuracy of threading, laying a solid foundation for subsequent construction.

[0003] Traditional cable threading machines mainly consist of a traction mechanism, a power drive system, a control system, guiding and positioning devices, and a shuttle channel. The traction mechanism is the direct actuator for threading the steel strands. It typically consists of one or more pairs of traction wheels with special anti-slip textures or grooves on their surfaces. The driving traction wheel rotates at high speed under the power drive system, while the driven traction wheel cooperates with the driving wheel through a clamping device, tightly clamping the steel strand bundle between the two wheels. When the driving wheel rotates, the friction between the wheel and the steel strand bundle drives the bundle to move along a preset direction, thus achieving the threading action. This type of cable threading machine relies on the friction generated between the pressure wheel and the bundle of steel strands to clamp and transport the strands; however, the friction between the pressure wheel and the strands is low, making it prone to slippage.

[0004] Furthermore, traditional cable threading machines often employ mechanical transmission in their power drive system and traction mechanism, resulting in a complex internal structure and a large, heavy machine. This makes handling and installation extremely difficult on actual construction sites, especially in confined spaces like inside bridge box girders or on high-altitude work platforms. Moreover, traditional cable threading machines typically have a fixed height, designed only to meet the cable threading requirements of anchor holes at a specific height. When encountering anchor holes at different heights, such as low-lying abutment anchor holes or high-lying pier anchor holes, the inability to easily adjust the machine height often necessitates the construction of complex scaffolding or the use of lifting platforms to adjust the machine's position. This undoubtedly increases construction costs and safety risks, and severely impacts construction progress. Utility Model Content

[0005] The purpose of this utility model is to provide a clamping jack that can be applied to a whole bundle threading machine, and can ensure the reliability of clamping the steel strands during the threading process, and can also be used for threading whole bundles of steel strands of different specifications.

[0006] To solve the above problems, the technical solution adopted by this utility model is as follows: This clamping jack includes a cylinder body and a piston rod with one end sliding inside the cylinder body and the other end extending out of the cylinder body. The end of the piston rod extending out of the cylinder body is connected to a cylindrical clamping head. A steel strand transmission channel is radially provided in the middle of the clamping head. A clamping fork is connected to the extended end of the piston rod. The clamping fork is installed in a movement channel axially provided inside the clamping head. A steel strand sensor is installed in the clamping head.

[0007] In the above-mentioned technical solution for clamping the jack, a more specific technical solution may be: the clamping fork consists of at least two clamping blocks, one end of the two clamping blocks is fixedly connected, the other end is opened outward, and its connecting end is connected and fixed to the piston rod through a connector; the clamping head is connected to the cylinder body through a thread.

[0008] In some possible implementations, the clamping head is a cylindrical clamping head closed at both ends, with a threaded hole at one end for threaded connection with the cylinder body. Two symmetrical faces of the cylindrical wall of the clamping head have elongated notches that extend through the other end of the clamping head. The elongated notches are connected to the steel strand transmission channel and the motion channel, and are perpendicular to the steel strand transmission channel. The fork tail of the clamping fork extends into the elongated notch.

[0009] A cable threading machine includes a cable threading mechanism with an elongated base plate. A guide tube and a guide roller are mounted at one end of the elongated base plate, and a cable outlet tube and a cable outlet roller are mounted at the other end. Two clamping jacks, arranged front-to-back and laterally, are mounted on the elongated base plate between the guide roller and the cable outlet roller. Each clamping jack is mounted on its respective guide rod via a connecting support mounted below it. One clamping jack is driven by a first electric cylinder mounted near the guide roller to slide back and forth along the guide rod, and the other clamping jack is driven by a second electric cylinder mounted near the cable outlet roller to slide back and forth along the guide rod. The electric cylinders and the clamping jacks are respectively connected to a control device.

[0010] In some possible implementations, a slider is mounted on each side of the bottom surface of each connecting support, and the slider is fitted onto the guide rod; a transmission roller is provided between the two clamping jacks on the steel strand transmission path; one of the guide rods of the clamping jack near the guide roller is installed between the guide roller and the transmission roller, and the other guide rod is installed on one side of the elongated base plate; one of the guide rods of the clamping jack near the cable output roller is installed between the cable output roller and the transmission roller, and the other guide rod is installed on the other side of the elongated base plate; both ends of each guide rod are mounted on their respective guide rod supports.

[0011] In some possible implementations, the cylinder body of the clamping jack is fixed to the connecting support via a lug, and the front ends of the push rods of the first electric cylinder and the second electric cylinder are respectively connected to the connecting support via forks.

[0012] In some possible implementations, a lifting platform with an outer frame is also included, the outer frame having casters at its bottom and hydraulic cylinders mounted on its sides, and the cable-threading mechanism is mounted on the lifting platform.

[0013] By adopting the above technical solution, this utility model has the following beneficial effects compared with the prior art:

[0014] 1. This utility model uses a clamping fork and a clamping head to clamp the steel strand. The clamping fork, connected to the extended end of the piston rod, is installed in the axially provided movement channel inside the clamping head. The clamping head has a radially provided steel strand transmission channel in the middle. When the piston rod slides in the cylinder, the clamping fork can move axially in the movement channel, thereby achieving precise clamping of the steel strand, improving the friction with the steel strand, and avoiding slippage during cable threading. At the same time, the clamping fork pushes and clamps the steel strand towards the clamping head, which not only improves the reliability of steel strand clamping, but can also be used to thread bundles of steel strands of different specifications, improving the applicability of the cable threading machine.

[0015] 2. The end of the cylinder that extends from the piston rod is connected to a cylindrical clamping head, and the clamping head has a radial steel strand transmission channel in the middle. This structural design allows the steel strand to pass smoothly through the clamping head, which greatly facilitates the installation and positioning of the steel strand. In actual use, no complicated installation steps are required, and the steel strand can be quickly guided to the designated position, effectively improving the efficiency of construction or operation.

[0016] 3. The cable threading mechanism of this utility model is equipped with a long base plate, with a guide tube and guide roller installed at one end and a cable outlet tube and cable outlet roller installed at the other end, forming a through steel strand transmission path. This structural design can guide the steel strand to be transported smoothly in a predetermined direction, reducing deviation and jamming during the cable threading process. With the help of two clamping jacks arranged in front and behind, the steel strand is alternately clamped and slides along the guide rod under the drive of the electric cylinder, which can form a continuous pushing force to realize the rapid cable threading of the entire bundle of steel strands. Compared with the traditional cable threading method, it greatly improves the work efficiency, and is especially suitable for cable threading scenarios of long lengths and multiple strands of steel strands.

[0017] 4. Two clamping jacks are mounted on the guide rod via connecting supports. The distance between them can be adjusted according to the length of the steel strand and the cable threading requirements, flexibly adapting to cable threading operations of different specifications. At the same time, the design of the electric cylinder driving the clamping jacks to slide along the guide rod allows the equipment to adjust the pushing position in real time according to the cable threading progress, ensuring that the entire bundle of steel strands is evenly stressed and avoiding deformation or damage to the steel strands due to uneven stress. This expands the applicability of the equipment and can meet the cable threading needs of various engineering fields such as bridge construction and geotechnical anchoring.

[0018] 5. The transmission rollers positioned between the two clamping jacks are located on the steel strand transmission path and provide auxiliary support and guidance for the steel strand. When the steel strand passes through the transmission rollers under the push of the clamping jacks, the transmission rollers reduce the friction between the steel strand and the base plate, preventing wear or deformation of the steel strand due to excessive friction. At the same time, the transmission rollers, guide rollers, and cable exit rollers together form a multi-point support transmission system, ensuring that the steel strand remains in a straight transmission state throughout the entire cable threading process. This effectively improves the transmission stability and cable threading accuracy of the steel strand, making it particularly suitable for engineering scenarios with high cable threading accuracy requirements.

[0019] 6. The lifting platform has an outer frame, casters at the bottom, and hydraulic cylinders on the side. The cable threading mechanism is mounted on the lifting platform. This design gives the entire cable threading machine flexible movement and height adjustment capabilities: the casters allow for quick movement of the equipment on the construction site without the need for other handling tools, greatly improving the equipment's mobility; the hydraulic cylinders enable precise adjustment of the lifting platform's height, allowing the steel strand transmission path of the cable threading mechanism to align with cable threading channels at different heights, adapting to the construction needs of different engineering scenarios, significantly expanding the equipment's engineering adaptability, and improving its application range and flexibility. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the external structure of the clamping jack of this utility model.

[0021] Figure 2 This is a schematic diagram of the internal structure of the clamping jack of this utility model.

[0022] Figure 3 This is a schematic diagram of the internal structure of the clamping jack of this utility model in the clamping state.

[0023] Figure 4 This is a schematic diagram of the cable-threading mechanism of this utility model.

[0024] Figure 5 This is a schematic diagram of the structure of the cable threading machine of this utility model.

[0025] Explanation of icon numbers:

[0026] 1. Cylinder body; 2. Piston rod; 3. Clamping head; 4. Steel strand transmission channel; 5. Clamping fork; 6. Movement channel; 7. Steel strand sensor; 8. Connector; 9. Threaded hole; 10. Long strip notch; 11. Long base plate; 12. Guide tube; 13. Guide roller; 14. Cable outlet tube; 15. Cable outlet roller; 16. First clamping jack; 17. First connecting support; 18. First guide rod; 19. Slider one; 20. Slider two; 21. First electric cylinder; 22. Ear plate; 23. Second connecting support; 24. Slider three; 25. Slider four; 26. Third guide rod; 27. Fourth guide rod; 28. Second clamping jack; 29. ​​Second electric cylinder; 30. Transmission roller; 31. Guide rod support seat; 32. Fork ear; 33. Lifting platform outer frame; 34. Lifting platform; 35. Universal wheel; 36. Hydraulic cylinder; 37. Steel strand bundle. Detailed Implementation

[0027] To make the above-mentioned objectives, features, and advantages of this utility model more readily understood, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model; however, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "fixation," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] like Figure 1-3As shown, this utility model discloses a clamping jack, including a cylinder body 1 and a piston rod 2 with one end slidingly connected to the cylinder body and the other end extending out of the cylinder body. A cylindrical clamping head 3 is connected to the end of the piston rod 2 extending out of the cylinder body 1. A steel strand transmission channel 4 is radially provided in the middle of the clamping head. This structural design allows the steel strand to pass smoothly through the clamping head, greatly facilitating the installation and positioning of the steel strand bundle. In actual use, no complicated installation steps are required, and the steel strand bundle can be quickly guided to the designated position, effectively improving the efficiency of construction or operation. A clamping fork 5 is connected to the extended end of the piston rod 2. The clamping fork is mounted within the axially oriented movement channel 6 inside the clamping head 3. When the piston rod slides within the cylinder, the clamping fork can move axially within the movement channel, thereby achieving precise clamping of the steel strand bundle. This design ensures that the clamping fork can stably act on the steel strand bundle, providing reliable clamping force and preventing the steel strand bundle from slipping or falling off during the force application process. This guarantees the stability and reliability of the entire clamping process, laying the foundation for the smooth progress of subsequent related operations. The clamping head 3 is equipped with a steel strand sensor 7, which can monitor the status of the steel strand in real time, such as whether the steel strand is correctly positioned and whether there is any abnormal displacement or deformation during the force application process. Through the real-time feedback from the sensor, operators can promptly understand the working status of the steel strand bundle and take corresponding measures quickly when problems are detected, avoiding safety accidents caused by abnormal steel strand conditions and effectively improving the safety and reliability of equipment use. The clamping fork 5 is symmetrically assembled from at least two clamping blocks. One end of each clamping block is fixedly connected, while the other end opens outward, forming an elastic clamping space. The connecting end is fixedly connected to the piston rod 2 via the connector 8. The clamping head 3 is connected to the cylinder 2 via threads. When the piston rod drives the clamping fork to move axially, the opening clamping block can adaptively adjust the clamping force according to the diameter of the steel strand bundle. This ensures reliable clamping of steel strand bundles of different specifications and avoids damage to the steel strand sheath due to excessive clamping force. Compared with the integrated structure, this split clamping fork design significantly improves the equipment's adaptability to steel strands of different diameters. It is especially suitable for engineering scenarios that require frequent changes in steel strand specifications, reducing downtime caused by equipment changes and improving work efficiency. The clamping head 3 is a cylindrical clamping head closed at both ends. One end of the clamping head 3 is provided with a threaded hole 9 for threaded connection with the cylinder body 2. Two symmetrical surfaces of the cylindrical wall of the clamping head 3 are provided with elongated notches 10, which pass through the other end of the clamping head 3. The elongated notches 10 are connected to the steel strand transmission channel 4 and the movement channel 6, and the elongated notches are arranged perpendicular to the steel strand transmission channel 4. The fork tail of the clamping fork 5 extends into the elongated notch 10.

[0030] like Figure 4 and Figure 5The cable threading machine shown includes a cable threading mechanism with an elongated base plate 11. A guide tube 12 and a guide roller 13 are installed at the front end of the elongated base plate 11, and a cable outlet tube 14 and a cable outlet roller 15 are installed at the rear end, forming a through-path for the steel strand transmission. Two clamping jacks, arranged front-to-back and laterally, are installed on the elongated base plate 11 between the guide roller 13 and the cable outlet roller 15. The first clamping jack 16 is mounted on a guide rod via a first connecting support 17 installed below it. The cylinder of each clamping jack is connected and fixed to its respective connecting support via its respective ear plate 22. A connecting support 17 has a slider 19 and a slider 20 mounted on its bottom sides. Slider 19 is fitted onto the first guide rod 18, and slider 20 is fitted onto the second guide rod. The first and second guide rods are arranged parallel to each other. A first clamping jack 16 is driven by a first electric cylinder 21 installed near the guide roller 12 to slide back and forth along the first and second guide rails. A second clamping jack 28 is fitted onto the guide rod via a second connecting support 23 installed below it. A slider 3 24 and a slider 4 25 are mounted on the bottom sides of the second connecting support 23, and slider 3 24 is fitted onto the third guide rod 26. Above, slider 4 25 is mounted on the fourth guide rod 27, with the third and fourth guide rods arranged parallel to each other. The second clamping jack 28 is driven by the second electric cylinder 29, which is installed near the cable exit roller 15, to slide back and forth along the third and fourth guide rails. The front ends of the push rods of the first electric cylinder 21 and the second electric cylinder 29 are respectively connected to their respective connecting supports through fork lugs 32. The two clamping jacks arranged in a front-to-back manner alternately clamp the steel strand bundle 37 and slide along the guide rods under the drive of the electric cylinders, which can form a continuous pushing force to realize the rapid cable threading of the entire bundle of steel strands, which greatly improves the operation compared with the traditional cable threading method. Efficiency: The electric cylinder and clamping jack are connected to the control device, which can precisely adjust the extension and retraction stroke of the electric cylinder and the clamping force of the clamping jack, realizing automated control of the cable threading process. Operators do not need to perform complicated manual operations; they only need to set relevant parameters, and the equipment can complete the cable threading operation according to the settings, reducing labor intensity and avoiding human error, thus improving the consistency and reliability of the cable threading operation. In addition, the setting of guide rollers and cable exit rollers can reduce the friction between the steel strand bundle and the equipment, making the steel strand bundle transport smoother and further improving the convenience of operation.

[0031] In some possible preferred embodiments, a transmission roller 30 is provided between the first clamping jack 16 and the second clamping jack 28 on the steel strand transmission path. The transmission roller 30 can provide auxiliary support and guidance for the steel strand bundle. When the steel strand bundle passes through the transmission roller under the push of the clamping jack, the transmission roller can reduce the friction between the steel strand bundle and the base plate, and avoid wear or deformation of the steel strand bundle due to excessive friction. At the same time, the transmission roller, the guide roller, and the cable exit roller together form a multi-point support transmission system to ensure that the steel strand bundle always maintains a straight transmission state throughout the entire cable threading process. The third guide rod 26 of the second clamping jack 28 is installed between the guide roller 12 and the transmission roller 30, and the fourth guide rod 27 is installed on the left side of the elongated base plate 11. The second guide rod of the first clamping jack 16 is installed between the cable exit roller 15 and the transmission roller 30, and the first guide rod 18 is installed on the right side of the elongated base plate 11. Both ends of the four guide rods are installed on their respective guide rod support seats 31.

[0032] Among some possible preferred solutions, a lifting platform 34 with an outer frame 33 is also included. The outer frame 33 has casters 35 at its bottom and hydraulic cylinders 36 mounted on its sides. The cable threading mechanism is mounted on the lifting platform 34. This design gives the entire cable threading machine flexible movement and height adjustment capabilities: the casters allow for quick movement of the equipment on the construction site without the need for other handling tools, significantly improving the equipment's mobility; the hydraulic cylinders enable precise adjustment of the lifting platform height, allowing the steel strand transmission path of the cable threading mechanism to align with cable threading channels at different heights, adapting to the construction needs of different engineering scenarios. For example, in bridge construction, the equipment height can be adjusted according to the height of the bridge structure; in geotechnical anchoring projects, it can adapt to cable threading operations at different slope heights, significantly expanding the equipment's engineering adaptability and improving its scope of use and flexibility.

Claims

1. A clamping jack, comprising a cylinder and a piston rod with one end slidably connected to the cylinder and the other end extending out of the cylinder, characterized in that: The cylinder body has a cylindrical clamping head connected to the extended piston rod end. The clamping head has a radially arranged steel strand transmission channel in the middle. The extended piston rod end is connected to a clamping fork, which is installed in an axially arranged movement channel inside the clamping head. The clamping head is equipped with a steel strand sensor.

2. The clamping jack according to claim 1, characterized in that: The clamping fork consists of at least two clamping blocks, one end of which is fixedly connected and the other end is open outward. The connecting end is connected and fixed to the piston rod through a connector. The clamping head is connected to the cylinder body through a thread.

3. The clamping jack according to claim 2, characterized in that: The clamping head is a cylindrical clamping head closed at both ends. One end of the clamping head is provided with a threaded hole for threaded connection with the cylinder body. Two symmetrical surfaces of the cylindrical wall of the clamping head are provided with elongated notches, which pass through the other end of the clamping head. The elongated notches are connected to the steel strand transmission channel and the motion channel, and the elongated notches are arranged perpendicular to the steel strand transmission channel. The fork tail of the clamping fork extends into the elongated notch.

4. A cable threading machine, comprising a cable threading mechanism, characterized in that: The cable-threading mechanism has an elongated base plate. A guide tube and a guide roller are installed at one end of the elongated base plate, and a cable-exit tube and a cable-exit roller are installed at the other end. Two clamping jacks, as described in any one of claims 1-3, are installed on the elongated base plate between the guide roller and the cable-exit roller, arranged in a front-to-back and laterally. Each clamping jack is mounted on its respective guide rod via a connecting support installed below it. One clamping jack is driven by a first electric cylinder installed near the guide roller to slide back and forth along the guide rod, and the other clamping jack is driven by a second electric cylinder installed near the cable-exit roller to slide back and forth along the guide rod. The electric cylinder and the clamping jack are respectively connected to a control device.

5. The cable threading machine according to claim 4, characterized in that: Each of the connecting supports has a slider installed on both sides of its bottom surface, and the slider is fitted onto the guide rod; a transmission roller is provided between the two clamping jacks on the steel strand transmission path; one of the guide rods of the clamping jack near the guide roller is installed between the guide roller and the transmission roller, and the other guide rod is installed on one side of the elongated base plate; one of the guide rods of the clamping jack near the cable output roller is installed between the cable output roller and the transmission roller, and the other guide rod is installed on the other side of the elongated base plate; both ends of each guide rod are mounted on their respective guide rod support seats.

6. The cable threading machine according to claim 5, characterized in that: The cylinder body of the clamping jack is fixed to the connecting support via a lug plate, and the front ends of the push rods of the first electric cylinder and the second electric cylinder are respectively connected to the connecting support via fork lugs.

7. The cable threading machine according to claim 4, 5, or 6, characterized in that: It also includes a lifting platform with an outer frame, the outer frame of which is equipped with casters at the bottom and hydraulic cylinders on the side, and the cable threading mechanism is mounted on the lifting platform.

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