Tensioning device for track slab production

Abstract

The application discloses a tensioning device for track slab production and relates to the technical field of track slab production. The tensioning device for track slab production comprises a limiting structure, a guiding structure, a screwing structure and a lifting structure. The limiting structure is sleeved on the limiting end. The guiding structure is sleeved on the screwing end. The screwing structure is provided between the guiding structure and the screwing end. The screwing end penetrates through the guiding structure and extends into the screwing structure through the screwing space. The screwing structure is used for driving the screwing end to rotate, so that the tensioning rod can stretch the prestressed steel bar. The lifting structure is used for driving the limiting structure, the guiding structure and the screwing structure to lift. The limiting structure, the guiding structure and the screwing structure are integrated on the lifting structure. The positioning process of the tensioning device for track slab production is simplified. Meanwhile, the working strength of the operator for adjusting the position of the device is reduced, and the tensioning operation efficiency in the track slab production process is improved.

Description

Technical Field

[0001] This invention relates to the field of track slab production technology, and in particular to a tensioning device for track slab production. Background Technology

[0002] As a key component in rail transit engineering, the quality of track slabs directly affects the smoothness and safety of train operation. During track slab manufacturing, prestressing tensioning is a core step in ensuring structural performance. By tensioning prestressed steel bars, prestress is generated in the concrete, significantly improving the flexural strength and durability of the track slab.

[0003] Currently, the tensioning equipment used in the industry generally lacks position adaptability and cannot meet the tensioning requirements of track slabs of different specifications. When aligning the tensioning rod with the anchor hole, manual adjustments are often required, which seriously affects work efficiency. Summary of the Invention

[0004] The main objective of this invention is to provide a tensioning device for track slab production, which aims to improve the tensioning efficiency of track slab tensioning rods.

[0005] To achieve the above objectives, the present invention proposes a tensioning device for track slab production, wherein a tensioning rod is inserted inside the track slab, the tensioning rod is connected to the prestressed steel bars inside the track slab, and the two ends of the tensioning rod along its axial direction are a limiting end and a tightening end, respectively. The tensioning device for track slab production includes:

[0006] A limiting structure is sleeved on the limiting end and abuts against the track plate;

[0007] A guide structure is sleeved on the screwing end and is positioned close to the track plate.

[0008] A screwing structure is provided, which is positioned corresponding to the screwing end. A screwing space is provided between the screwing structure and the guide structure. The screwing end passes through the guide structure and extends into the screwing structure through the screwing space. The screwing structure is used to drive the screwing end to rotate so that the tension rod stretches the prestressed steel bar.

[0009] A lifting structure is provided, wherein the limiting structure, the guiding structure, and the screwing structure are spaced apart along the axial direction of the tension rod. The lifting structure is used to drive the limiting structure, the guiding structure, and the screwing structure to rise and fall, so that the limiting structure corresponds to the position of the limiting end, and the guiding structure and the screwing structure correspond to the position of the screwing end.

[0010] In one embodiment, the lifting structure includes a support frame, a mounting frame, and a lifting drive component. The mounting frame extends horizontally and is framed outside the track plate. The support frame extends vertically. The connecting end of the lifting drive component is mounted on the support frame, and the output end of the lifting drive component is mounted on the mounting frame. The limiting structure, the guiding structure, and the screwing structure are spaced apart along the axial direction of the tension rod on the mounting frame. The lifting drive component is used to drive the mounting frame to lift, thereby driving the limiting structure, the guiding structure, and the screwing structure to lift.

[0011] In one embodiment, the support frame includes multiple crossbeams and multiple columns. The multiple crossbeams surround the upper part of the track plate along the circumference of the track plate, and the multiple columns are distributed along the circumference of the track plate. Adjacent crossbeams are connected by a column. The mounting frame is disposed inside the multiple crossbeams and below the multiple crossbeams. The connecting end of the lifting drive component is mounted on the crossbeam.

[0012] In one embodiment, the connecting end of the lifting drive component is mounted to the support frame via a first hinge seat, and the output end of the lifting drive component is mounted to the mounting frame via a second hinge seat.

[0013] In one embodiment, the screwing structure includes a mounting base, a first driving member, and a transmission assembly. The mounting base is installed on the lifting structure at a position corresponding to the screwing end. The first driving member is installed on the mounting base, and the output end of the first driving member is connected to the screwing end through the transmission assembly and is used to drive the screwing end to rotate.

[0014] In one embodiment, the transmission assembly includes a connecting sleeve and a driving sleeve. The driving sleeve is fitted onto the output end of the first driving member, and the connecting sleeve is fitted onto the screwing end. The driving sleeve has a connection port on its side facing the screwing end, and the connection port extends axially along the driving sleeve. The outer wall of the driving sleeve has a connection socket, and the connection socket extends radially along the driving sleeve. The connection socket communicates with the connecting port. The connecting sleeve has a connection hole corresponding to the position of the connection socket, and the connection hole extends radially along the connecting sleeve. The connecting sleeve is inserted into the connection port, and the connection hole and the connection socket are connected by a pin.

[0015] In one embodiment, the guide structure includes a guide seat and a guide ring. The guide seat is installed on the lifting structure at a position corresponding to the screwing end. The guide ring is rotatably installed on the guide seat. A screwing space is provided between the guide seat and the screwing structure. The screwing end passes through the guide ring and the guide seat and extends into the screwing structure.

[0016] In one embodiment, the track plate is provided with a first anchoring hole at the position corresponding to the screwing end, and a first anchoring nut is sleeved on the screwing end; the guide structure further includes a second driving member, the second driving member is installed on the guide seat, the output end of the second driving member is connected to the guide ring, the guide ring is sleeved outside the first anchoring nut, and the second driving member is used to drive the guide ring to rotate so as to screw the first anchoring nut into the first anchoring hole.

[0017] In one embodiment, the limiting structure includes a limiting seat, a limiting ring, a limiting rod, and a limiting head. The limiting seat is installed on the mounting frame at a position corresponding to the limiting end. The limiting ring is rotatably installed on the limiting seat and sleeved on the limiting end. The limiting rod is installed at the bottom end of the limiting seat and extends along the axial direction of the tension rod. The limiting head is installed between the limiting rod and the track plate, and the limiting rod abuts against the track plate through the limiting head.

[0018] In one embodiment, the track plate is provided with a second anchoring hole at the position corresponding to the limiting end, and the limiting end is fitted with a second anchoring nut; the limiting structure further includes a third driving member, the third driving member is installed on the limiting seat, the output end of the third driving member is connected to the limiting ring, the limiting ring is fitted outside the second anchoring nut, and the third driving member is used to drive the limiting ring to rotate so as to screw the second anchoring nut into the second anchoring hole.

[0019] The technical solution of this invention integrates the limiting structure, guiding structure, and screwing structure into the lifting structure, simplifying the positioning process of the tensioning device for track slab production, reducing the workload of operators adjusting the device position, and improving the efficiency of tensioning operations. Furthermore, the synergistic effect of the guiding structure and the limiting structure ensures that the tensioning rod always moves along the predetermined trajectory, improving the accuracy of prestress application to the track slab, achieving axial stability control during the rotation of the tensioning rod, and eliminating the problem of uneven prestress distribution caused by radial offset. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 A schematic diagram of an embodiment of the tensioning device for track slab production provided by the present invention;

[0022] Figure 2 This is a schematic diagram of an embodiment of the lifting structure involved in the present invention;

[0023] Figure 3 A schematic diagram of another embodiment of the tensioning device for track slab production provided by the present invention;

[0024] Figure 4 This is a schematic diagram of the limiting structure, guiding structure, or screwing structure involved in the present invention;

[0025] Figure 5 for Figure 1 A magnified view of a section at point A in the middle;

[0026] Figure 6 for Figure 2 A magnified view of a section at point B.

[0027] Explanation of icon numbers:

[0028] 10. Tensioning rod; 20. Track slab; 11. Limiting end; 12. Tightening end; 21. First anchoring hole; 13. First anchoring nut; 22. Second anchoring hole; 14. Second anchoring nut;

[0029] 100. Limiting structure; 200. Guide structure; 300. Twisting structure; 400. Lifting structure; 201. Twisting space; 110. Limiting seat; 120. Limiting ring; 130. Limiting rod; 140. Limiting head; 150. Third driving component; 210. Guide seat; 220. Guide ring; 230. Second driving component; 310. Mounting seat; 320. First driving component; 330. Transmission assembly; 331. Connecting bushing; 332. Drive bushing; 301. Connecting port; 302. Connecting socket; 303. Connecting hole; 410. Support frame; 420. Mounting frame; 430. Lifting driving component; 440. First hinge seat; 450. Second hinge seat; 411. Crossbeam; 412. Column.

[0030] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0032] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0033] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0034] As a key component in rail transit engineering, the quality of track slabs directly affects the smoothness and safety of train operation. During track slab manufacturing, prestressing tensioning is a core step in ensuring structural performance. Tensile prestressing steel bars induces prestress in the concrete, significantly improving the flexural strength and durability of the track slab. Currently, the tensioning equipment used in the industry faces three major technical bottlenecks: First, traditional manual tensioning devices rely on manual operation, which is not only inefficient but also makes it difficult to ensure the synchronization of tensioning forces across multiple steel bars, easily leading to uneven stress distribution within the track slab. Second, while hydraulic tensioning systems offer high output force, they suffer from bulky equipment and large pressure fluctuations, easily causing prestress loss during prolonged operation. Third, existing electric tensioning devices generally lack precise positioning capabilities, and the tensioning rod is prone to radial displacement during rotation, leading to accelerated wear at threaded connections. More significantly, existing devices lack adjustable lifting mechanisms, failing to adapt to the tensioning requirements of track slabs of different specifications. Alignment between the tensioning rod and anchor holes often requires repeated manual adjustments, severely impacting operational efficiency. In addition, traditional equipment requires separate anchoring operations after tensioning, which extends the production cycle and increases the risk of human error.

[0035] To address this technical problem, the present invention proposes a tensioning device for track slab production.

[0036] Please see Figures 1 to 4In one embodiment of the present invention, a tension rod 10 is inserted into the track slab 20, and the tension rod 10 is connected to the prestressed steel bars in the track slab 20. The two ends of the tension rod 10 along its axial direction are a limiting end 11 and a screwing end 12, respectively. The tensioning device for track slab production includes a limiting structure 100, a guiding structure 200, a screwing structure 300, and a lifting structure 400. The limiting structure 100 is sleeved on the limiting end 11 and abuts against the track slab 20; the guiding structure 200 is sleeved on the screwing end 12 and is located close to the track slab 20; the screwing structure 300 is located at the position corresponding to the screwing end 12, and the screwing structure 300 and the guiding structure 200 are connected. A twisting space 201 is provided between 00 and 00. The twisting end 12 passes through the guide structure 200 and extends into the twisting structure 300 through the twisting space 201. The twisting structure 300 is used to drive the twisting end 12 to rotate so that the tension rod 10 stretches the prestressed steel bar. The limiting structure 100, the guide structure 200 and the twisting structure 300 are arranged at intervals along the axial direction of the tension rod 10 on the lifting structure 400. The lifting structure 400 is used to drive the limiting structure 100, the guide structure 200 and the twisting structure 300 to rise and fall so that the limiting structure 100 corresponds to the position of the limiting end 11 and the guide structure 200 and the twisting structure 300 correspond to the position of the twisting end 12.

[0037] Specifically, the limiting structure 100 is sleeved on the limiting end 11 of the tension rod 10 and abuts against the track plate 20, the guide structure 200 is sleeved on the screwing end 12 and is set close to the track plate 20, the screwing structure 300 is used to drive the screwing end 12 to rotate, and the lifting structure 400 drives the limiting structure 100, the guide structure 200 and the screwing structure 300 to rise and fall to match the installation position of the tension rod 10.

[0038] The limiting structure 100 refers to the constraint component sleeved on the fixed end of the tension rod 10, which can be a rigid support with a limiting ring 120, limiting the radial and axial displacement of the tension rod 10 through mechanical contact. The guiding structure 200 refers to the rotary guiding mechanism set on the turning end 12, such as a guide ring 220 with bearings, which allows circumferential rotation while maintaining axial positioning. The turning structure 300 refers to the drive component, such as a servo motor with a reducer, which transmits torque by connecting to the turning end 12 through a transmission shaft sleeve. The lifting structure 400 refers to the vertical moving platform, such as a hydraulic lifting frame, which achieves overall height adjustment of the device by synchronously controlling multiple lifting drive components 430.

[0039] More specifically, during operation, the lifting structure 400 first lowers the limiting structure 100 to the side of the track slab 20, achieving rigid contact through the limiting rod 130 at the bottom of the limiting seat 110. Simultaneously, the guide structure 200 lowers to the outside of the turning end 12, at which point the turning structure 300 is connected to the turning end 12 via the transmission assembly 330. After the turning structure 300 is activated, the tension rod 10 is radially constrained by the guide ring 220 during rotation, while the limiting structure 100 continuously provides reverse support force. The lifting structure 400 adjusts its height according to the position of the tension rod 10, ensuring that the limiting structure 100, guide structure 200, and turning structure 300 are in their predetermined working positions, effectively eliminating radial offset during the rotation of the tension rod 10 and ensuring uniform stress on the prestressed steel bars.

[0040] Compared to existing technologies, traditional devices require the separate installation of limiters and drive equipment. This application achieves simultaneous positioning of multiple structures through an integrated lifting platform, reducing the number of manual adjustments. Compared to hydraulic tensioning devices, this solution uses a mechanical turning method to avoid pressure fluctuations in the hydraulic system. Compared to fixed electric tensioning equipment, the liftable structure 400 can adapt to the production needs of track slabs 20 of different specifications.

[0041] The technical solution provided by this invention integrates the limiting structure 100, the guiding structure 200, and the screwing structure 300 into the lifting structure 400, simplifying the positioning process of the tensioning device for track slab production, reducing the workload of operators adjusting the device position, and improving the efficiency of tensioning operations. Furthermore, the synergistic effect of the guiding structure 200 and the limiting structure 100 ensures that the tensioning rod 10 always moves along a predetermined trajectory, improving the accuracy of prestress application to the track slab 20, achieving axial stability control during the rotation of the tensioning rod 10, and eliminating the problem of uneven prestress distribution caused by radial offset.

[0042] Please continue reading. Figure 1 , Figure 2 and Figure 3 In an embodiment of the present invention, the lifting structure 400 includes a support frame 410, a mounting frame 420, and a lifting drive component 430. The mounting frame 420 extends horizontally and is framed outside the track plate 20. The support frame 410 extends vertically. The connecting end of the lifting drive component 430 is mounted on the support frame 410, and the output end of the lifting drive component 430 is mounted on the mounting frame 420. The limiting structure 100, the guide structure 200, and the screwing structure 300 are spaced apart along the axial direction of the tension rod 10 on the mounting frame 420. The lifting drive component 430 is used to drive the mounting frame 420 to lift and lower, thereby driving the limiting structure 100, the guide structure 200, and the screwing structure 300 to lift and lower.

[0043] Specifically, the support frame 410 refers to the vertical load-bearing frame distributed circumferentially along the track slab 20. It can adopt a grid structure composed of beams 411 and columns 412, which provides the installation foundation for the lifting drive component 430 and bears the reaction force during the tensioning process. The mounting frame 420 refers to a frame-shaped support extending horizontally. It can adopt a rectangular or ring frame structure. Its inner space is used to accommodate the track slab 20, and its outer side is connected to the lifting drive component 430. The lifting movement allows the limiting structure 100, guide structure 200, and screwing structure 300 to adjust their height synchronously. The lifting drive component 430 refers to the mechanical device that realizes linear lifting action. It can be a hydraulic cylinder, electric push rod, or screw mechanism. Its connecting end is fixed to the support frame 410 by hinge, and its output end is connected to the mounting frame 420. The lifting stroke of the mounting frame 420 is controlled by telescopic movement.

[0044] More specifically, the mounting frame 420, through a horizontally extending frame structure, surrounds the periphery of the track plate 20 and moves up and down along the vertical track of the support frame 410 under the drive of the lifting drive component 430. The support frame 410 consists of multiple crossbeams 411 and columns 412. The crossbeams 411 are arranged circumferentially along the track plate 20 to form an annular support surface, and the columns 412 are vertically connected to adjacent crossbeams 411 to form a stable spatial frame. When the lifting drive component 430 is activated, the mounting frame 420 drives the limiting structure 100, the guide structure 200, and the rotating structure 300 to rise and fall as a whole, so that the limiting structure 100 is aligned with the limiting end 11 of the tension rod 10, while the guide structure 200 and the rotating structure 300 correspond to the position of the rotating end 12. The combined layout of the support frame 410 and the mounting frame 420 ensures the structural rigidity of the lifting system and provides an adjustable mounting platform for each functional component. This ensures that the limiting structure 100 and the limiting end 11 of the tension rod 10 maintain effective contact at all times, while also ensuring that the guide structure 200 and the screwing structure 300 accurately match the working position of the screwing end 12. This lifting structure 400 improves the adaptability of the device, effectively prevents axial displacement of the tension rod 10 during tensioning, and enhances the tensioning accuracy and anchorage reliability of the prestressed steel bars.

[0045] Please continue reading. Figure 1 , Figure 2 and Figure 3 In an embodiment of the present invention, the support frame 410 includes a plurality of crossbeams 411 and a plurality of columns 412. The plurality of crossbeams 411 surround the track plate 20 on the upper part of the track plate 20 along the circumference. The plurality of columns 412 are distributed along the circumference of the track plate 20. Two adjacent crossbeams 411 are connected by a column 412. The mounting frame 420 is disposed on the inner side of the plurality of crossbeams 411 and below the plurality of crossbeams 411. The connecting end of the lifting drive component 430 is installed on the crossbeams 411.

[0046] Specifically, the crossbeam 411 refers to the transverse support member extending circumferentially along the track slab 20, which can be formed by welding I-beams or rectangular steel pipes, and is used to provide a horizontal support foundation for the mounting frame 420. The column 412 refers to the vertical support member distributed circumferentially along the track slab 20, which can be made of H-beams or square steel, and is used to connect adjacent crossbeams 411 to form a split frame structure. The mounting frame 420 being located below and inside the crossbeam 411 means that its installation position is in the lower space of the area surrounded by the crossbeam 411, which can be achieved through a suspension connector, facilitating maintaining its relative position to the track slab 20 during lifting. The lifting drive component 430 being installed on the crossbeam 411 means that its fixing point is located at the load-bearing part of the crossbeam 411, and can be connected by bolts to ensure the stability of the force transmission path.

[0047] More specifically, multiple crossbeams 411 form a ring-shaped support frame around the track slab 20, and their circumferential arrangement can adapt to the operational needs of track slabs 20 of different sizes. Columns 412 are evenly distributed circumferentially, each column 412 connecting two adjacent crossbeams 411 to form a grid-like support system, facilitating on-site assembly and disassembly. The mounting frame 420 is located below the inner side of the crossbeams 411, avoiding interference with the main structure of the track slab 20 and ensuring the alignment accuracy of the guide structure 200 and the screwing end 12 during lifting. The lifting drive component 430 is directly installed at the load-bearing node of the crossbeam 411, allowing the driving force to be evenly transmitted through the crossbeam 411 to the entire support frame 410, effectively preventing local stress concentration and suppressing vibration and displacement during lifting. The lower placement of the mounting frame 420 improves space utilization and ensures the alignment accuracy of the screwing structure 300 and the guide structure 200, thereby ensuring the stability and repeatability of the tensioning operation.

[0048] Please continue reading. Figure 1 and Figure 2 In an embodiment of the present invention, the connecting end of the lifting drive component 430 is mounted on the support frame 410 via the first hinge seat 440, and the output end of the lifting drive component 430 is mounted on the mounting frame 420 via the second hinge seat 450.

[0049] Specifically, the first hinge seat 440 refers to the hinge component used to connect the lifting drive component 430 and the support frame 410. It can be implemented using a metal base with a rotating shaft, allowing the lifting drive component 430 to be angled on the support frame 410. The second hinge seat 450 refers to the hinge component used to connect the lifting drive component 430 and the mounting frame 420. It can be implemented using a connector with a ball joint structure, allowing multi-directional angular offset between the lifting drive component 430 and the mounting frame 420.

[0050] Specifically, the configuration of the track slab 20 causes the tension rod 10 to tilt slightly or deviate horizontally. Through the cooperation of the first hinge seat 440 and the second hinge seat 450, the lifting drive component 430 can adaptively adjust the connection angle, so that the limiting structure 100, the guide structure 200 and the turning structure 300 are adaptively adjusted to the connection position, thereby improving the operational reliability and working condition adaptability of the limiting structure 100, the guide structure 200 and the turning structure 300.

[0051] Please continue reading. Figure 1 and Figure 4 And see Figure 5 In an embodiment of the present invention, the screwing structure 300 includes a mounting base 310, a first driving member 320, and a transmission assembly 330. The mounting base 310 is installed on the lifting structure 400 at the position corresponding to the screwing end 12. The first driving member 320 is installed on the mounting base 310. The output end of the first driving member 320 is connected to the screwing end 12 through the transmission assembly 330 and is used to drive the screwing end 12 to rotate.

[0052] Specifically, the mounting base 310 refers to the support component used to fix the first driving member 320 and the transmission assembly 330. It can be implemented using a welded steel plate structure or a cast base, and its function is to provide a stable mounting foundation for the tightening operation. The first driving member 320 refers to the device that provides rotational power, which can be implemented using a servo motor or a stepper motor. By controlling the speed and torque, the stability of the rotation of the tension rod 10 is ensured. The transmission assembly 330 refers to the power transmission mechanism connecting the driving member and the tightening end 12. It can be implemented using a gear set or a coupling, and is used to efficiently transmit the rotational motion of the driving member to the tension rod 10.

[0053] More specifically, the screwing structure 300 is fixed to the lifting structure 400 via the mounting base 310, allowing it to adjust its height with the lifting structure 400 to align with the screwing end 12. After the first drive component 320 is activated, its output end forms a mechanical connection with the screwing end 12 of the tension rod 10 via the transmission assembly 330, driving the screwing end 12 to rotate axially. During this process, the tension rod 10 generates axial tensile force due to the rotation of the screwing end 12, thereby tensioning the prestressed steel bars. The transmission assembly 330 ensures the synchronization and reliability of power transmission, avoids the tension rod 10 from shifting due to torque fluctuations, reduces power loss through a rigid connection structure, and effectively prevents radial shift of the tension rod 10 during rotation, thereby improving the uniformity of tension force and operational efficiency. This solves the problem of uneven tension force distribution caused by unstable power transmission in existing tensioning devices. At the same time, the modular screwing structure 300 simplifies the maintenance process, reduces the failure rate caused by structural complexity, and ensures the tensioning accuracy and process stability of the prestressed steel bars of the track slab 20.

[0054] Please continue reading. Figure 5In an embodiment of the present invention, the transmission assembly 330 includes a connecting sleeve 331 and a driving sleeve 332. The driving sleeve 332 is sleeved on the output end of the first driving member 320, and the connecting sleeve 331 is sleeved on the screwing end 12. The driving sleeve 332 is provided with a connecting port 301 on the side facing the screwing end 12. The connecting port 301 extends axially along the driving sleeve 332. The outer wall of the driving sleeve 332 is provided with a connecting insertion port 302. The connecting insertion port 302 extends radially along the driving sleeve 332 and communicates with the connecting port 301. The connecting sleeve 331 is provided with a connecting hole 303 at the position corresponding to the connecting insertion port 302. The connecting hole 303 extends radially along the connecting sleeve 331. The connecting sleeve 331 is inserted into the connecting port 301, and the connecting hole 303 and the connecting insertion port 302 are connected by a pin.

[0055] Specifically, the connecting bushing 331 is an annular component fitted onto the outside of the screwing end 12, made of high-strength alloy steel, with a toothed groove on its inner wall matching the external thread of the screwing end 12 for transmitting torque. The drive bushing 332 is an annular component fitted onto the output end of the first drive member 320, and can be a split structure for easy quick docking with the connecting bushing 331. The connecting port 301 is an axial groove on the end face of the drive bushing 332, slightly wider than the outer diameter of the connecting bushing 331, for accommodating the insertion of the connecting bushing 331. The connecting socket 302 is a radial through hole on the side wall of the drive bushing 332, its axis perpendicular to the connecting port 301, for forming a pin mounting channel. The connecting hole 303 is a radial through hole on the side wall of the connecting bushing 331, its position corresponding to the connecting socket 302, for achieving pin penetration and fixation. The pin can be a cylindrical pin or a tapered pin, and its surface can be provided with anti-slip texture to enhance connection stability.

[0056] More specifically, when the drive sleeve 332 mates with the connecting sleeve 331, the connecting sleeve 331 is inserted into the connecting port 301 along the axial direction of the drive sleeve 332 until the connecting hole 303 aligns with the connecting socket 302. At this point, the pin is inserted radially into the connecting socket 302 and the connecting hole 303 to form a mechanical lock. The rotational torque output by the first drive component 320 is transmitted to the pin through the drive sleeve 332, and then the pin drives the connecting sleeve 331 and the screwing end 12 to rotate synchronously. This structure avoids the axial displacement that may occur in traditional keyway connections through the radial fixing effect of the pin. At the same time, the split structure facilitates quick disassembly and maintenance, realizing the quick disassembly and assembly of the drive component and the tension rod 10. In addition, the radial pin can withstand bidirectional torque, avoiding connection failure due to unilateral force. Compared with the keyway connection, the radial penetration of the pin eliminates the influence of axial assembly errors on transmission accuracy.

[0057] Please continue reading. Figure 1 , Figure 4 and Figure 5In an embodiment of the present invention, the guide structure 200 includes a guide seat 210 and a guide ring 220. The guide seat 210 is installed on the lifting structure 400 at the position corresponding to the twisting end 12. The guide ring 220 is rotatably installed on the guide seat 210. A twisting space 201 is provided between the guide seat 210 and the twisting structure 300. The twisting end 12 passes through the guide ring 220 and the guide seat 210 and extends into the twisting structure 300.

[0058] Specifically, the guide seat 210 refers to the support component fixed to the lifting structure 400, used to support the guide ring 220 and provide an installation reference. It can be implemented using a metal base with a flange, and its interior has a through hole for the screwing end 12 to pass through. The guide ring 220 refers to the rotating component sleeved on the outer periphery of the screwing end 12, which can be implemented using a ring structure with rolling bearings, used to constrain the radial offset of the screwing end 12. The screwing space 201 refers to the operating area between the guide seat 210 and the screwing structure 300, which can be formed by adjusting the axial distance between the guide seat 210 and the screwing structure 300, used to accommodate the transmission assembly 330 and allow the rotational movement of the screwing end 12.

[0059] More specifically, the twisting end 12 passes through the guide ring 220 and enters the twisting structure 300, where the transmission assembly 330 completes power transmission within the twisting space 201. When the twisting structure 300 drives the twisting end 12 to rotate, the guide ring 220 rotates synchronously with the twisting end 12. The rolling bearing reduces frictional resistance, while the rigid support of the guide seat 210 restricts the radial displacement of the twisting end 12 during rotation. The transmission assembly 330 maintains a stable connection with the twisting end 12 within the twisting space 201, preventing transmission failure due to the misalignment of the tension rod 10. By cooperating with the guide ring 220 and the guide seat 210, the screwing end 12 is allowed to rotate freely, while the radial offset is eliminated by mechanical constraint, ensuring that the tension rod 10 always moves along the axial direction. This solves the problems of weak anchorage and uneven distribution of tension force caused by the offset of the screwing end 12 during the tensioning process. The rotational freedom of the guide ring 220 and the rigid support of the guide seat 210 complement each other, so that the tension rod 10 can maintain a stable axial positioning effect when subjected to high torque, thereby improving the tensioning accuracy of the prestressed steel bars and the forming quality of the track slab 20.

[0060] Please continue reading. Figure 5 In an embodiment of the present invention, the track plate 20 is provided with a first anchoring hole 21 at the position corresponding to the screwing end 12, and the screwing end 12 is fitted with a first anchoring nut 13; the guide structure 200 also includes a second driving member 230, the second driving member 230 is installed on the guide seat 210, the output end of the second driving member 230 is connected to the guide ring 220, the guide ring 220 is fitted outside the first anchoring nut 13, and the second driving member 230 is used to drive the guide ring 220 to rotate so as to screw the first anchoring nut 13 into the first anchoring hole 21.

[0061] Specifically, the second driving component 230 refers to a power unit that independently controls the anchoring action. It can be implemented using a servo motor or a stepper motor. Its output end is connected to the guide ring 220 via a coupling, and it is used to drive the anchoring operation independently after the tension rod 10 has completed its stretching. The guide ring 220 is sleeved outside the first anchoring nut 13 because it matches the outer contour of the nut through a locking structure set on its inner wall. For example, a hexagonal inner cavity is used to cooperate with a hexagonal nut to ensure effective transmission of rotational torque. The first anchoring hole 21 and the first anchoring nut 13 have opposite thread directions, meaning that their screw-in directions are opposite. For example, the tension rod 10 uses a right-hand thread, while the anchoring nut uses a left-hand thread, so that the nut will not be screwed into the anchoring hole when the tension rod 10 is rotated and stretched.

[0062] More specifically, after the tension rod 10 completes the stretching of the prestressed steel bars through the screwing structure 300, the second drive component 230 is activated and drives the guide ring 220 to rotate. Due to the engaging connection between the guide ring 220 and the first anchoring nut 13, the nut, under the action of rotation, screws into the first anchoring hole 21 in a predetermined direction, thereby fixing the end of the tension rod 10. During this process, the rotation direction of the tension rod 10 is opposite to the screwing direction of the anchoring nut. For example, when the tension rod 10 rotates clockwise to complete the stretching, the anchoring nut needs to rotate counterclockwise to screw into the anchoring hole. Therefore, the drive of the screwing structure 300 will not interfere with the anchoring action. The anchoring operation is only performed after the tension rod 10 reaches the predetermined stretching amount, avoiding premature fixing that could lead to uneven prestress distribution. By setting an independent second drive component 230 and a reverse thread, the anchoring operation and the tensioning operation are completely separated in terms of timing and mechanical relationship, ensuring that the anchoring is only performed after the stretching is complete, thus achieving independent control of the tension force and the anchoring force. By operating in stages, we can ensure both the uniform stretching of the prestressed steel bars and the reliable locking of the anchor nuts and anchor holes, thereby improving the pass rate and structural stability of the track slab production.

[0063] Please continue reading. Figure 2 and Figure 4 And see Figure 6 In an embodiment of the present invention, the limiting structure 100 includes a limiting seat 110, a limiting ring 120, a limiting rod 130, and a limiting head 140. The limiting seat 110 is installed on the mounting frame 420 at the position corresponding to the limiting end 11. The limiting ring 120 is rotatably installed on the limiting seat 110 and is sleeved on the limiting end 11. The limiting rod 130 is installed at the bottom end of the limiting seat 110 and extends along the axial direction of the tension rod 10. The limiting head 140 is installed between the limiting rod 130 and the track plate 20, and the limiting rod 130 abuts against the track plate 20 through the limiting head 140.

[0064] Specifically, the limiting seat 110 refers to the support component fixed to the mounting bracket 420, which can be implemented by welding or bolting, and serves as the mounting base for supporting the limiting ring 120 and the limiting rod 130. The limiting ring 120 refers to a rotatable sleeve component, which can be implemented by a ring structure with bearings, allowing the tension rod 10 to maintain axial stability during rotation. The limiting rod 130 refers to a rigid connecting component, which can be implemented by a cylindrical metal rod, the length of which can be adjusted according to the thickness of the track plate 20, and is used to transmit the clamping force. The limiting head 140 refers to a contact-type pressure distribution component, which can be implemented by a rubber pad or a metal pressure block, and its contact surface can be machined into a flat or concave surface to adapt to the surface shape of the track plate 20.

[0065] More specifically, after the limiting end 11 of the tension rod 10 is fitted with the limiting ring 120, the limiting rod 130 extends axially to the surface of the track slab 20, forming a rigid contact through the limiting head 140. When the screwing structure 300 drives the tension rod 10 to rotate, the limiting ring 120 rotates synchronously with the tension rod 10, and the abutting structure formed by the limiting rod 130 and the limiting head 140 prevents the tension rod 10 from radially deviating. For example, an anti-loosening nut can be provided at the connection between the limiting rod 130 and the limiting seat 110 to adjust the extension length of the limiting rod 130, ensuring that the limiting head 140 always maintains a preset pressure with the surface of the track slab 20.

[0066] In some specific embodiments, the inner wall of the limiting ring 120 may be provided with a ball bearing to reduce its rotational resistance to below 5 N·m; the contact surface of the limiting head 140 may be machined into a circular plane with a diameter of 50 mm, and its material may be polyurethane rubber with a hardness range controlled between Shore A70 and A90.

[0067] Compared to existing technologies, traditional tensioning devices only use fixed stops to restrict the displacement of the tension rod 10, which cannot adapt to dynamic offsets during rotation. This solution, however, utilizes the synergistic effect of the limiting ring 120 and the limiting rod 130 to allow the tension rod 10 to rotate freely while using the rigid clamping of the limiting head 140 to eliminate lateral displacement, thus solving the positioning inaccuracy problem caused by torque during rotational tensioning. This achieves a high degree of consistency between the rotation axis of the tension rod 10 and the tensile direction of the prestressed steel bars, avoiding uneven prestress distribution caused by the offset of the tension rod 10.

[0068] Please continue reading. Figure 6In an embodiment of the present invention, the track plate 20 is provided with a second anchoring hole 22 at the position corresponding to the limiting end 11, and the limiting end 11 is fitted with a second anchoring nut 14; the limiting structure 100 also includes a third driving member 150, the third driving member 150 is installed on the limiting seat 110, the output end of the third driving member 150 is connected to the limiting ring 120, the limiting ring 120 is fitted outside the second anchoring nut 14, and the third driving member 150 is used to drive the limiting ring 120 to rotate so as to screw the second anchoring nut 14 into the second anchoring hole 22.

[0069] Specifically, the limiting seat 110 refers to the support component used to fix the limiting ring 120. It can be fixed to the mounting bracket 420 by welding or bolting, and its function is to provide a stable mounting base for the limiting ring 120. The limiting ring 120 refers to the rotating component sleeved on the outside of the limiting end 11. It can be rotated using a bearing or gear structure, and is used to transmit the rotational power of the third driving component 150 to the second anchoring nut 14. The third driving component 150 refers to the power source that drives the limiting ring 120 to rotate. It can be a servo motor or a stepper motor, and is connected to the limiting ring 120 through a coupling or gear set. Its function is to realize the precise screwing action of the second anchoring nut 14. The second anchoring nut 14 refers to the threaded component sleeved on the outside of the limiting end 11. Its thread direction is opposite to the rotation direction of the tension rod 10, ensuring that the tension rod 10 will not screw into the second anchoring hole 22 on its own when rotating. The second anchoring hole 22 refers to the threaded hole pre-set on the track plate 20, which is used to cooperate with the second anchoring nut 14 to achieve anchoring of the limiting end 11 through thread engagement.

[0070] More specifically, during the tensioning process, when the tension rod 10 is rotated by the screwing structure 300 to stretch the prestressed steel bars, the second anchoring nut 14 will not screw into the second anchoring hole 22 on its own because its thread direction is opposite to the rotation direction of the tension rod 10. At this time, the limiting head 140 of the limiting structure 100 presses against the track plate 20 through the limiting rod 130 to prevent the tension rod 10 from deviating. After tensioning is in place, the third driving component 150 is activated, driving the limiting ring 120 to rotate the second anchoring nut 14, causing it to screw into the second anchoring hole 22 along the thread direction opposite to the rotation direction of the tension rod 10, thereby completing the anchoring of the limiting end 11. During this process, the guide ring 220 of the guide structure 200 and the transmission component 330 of the screwing structure 300 work together to ensure that the tension rod 10 maintains axial stability during rotation and tensioning. The screwing action of the second anchoring nut 14 is controlled by an independent third drive component 150, separating the anchoring process from the tensioning process. This ensures that anchoring is performed only after tensioning is in place, avoiding anchoring failure caused by thread direction conflict. Independent control of the anchoring process at the limiting end 11 is achieved, solving the problem of uncontrollable anchoring timing caused by thread direction limitations in traditional tensioning devices, and improving the accuracy and reliability of anchoring operations. Simultaneously, the cooperation between the limiting structure 100 and the guide structure 200 further ensures the axial stability of the tensioning rod 10 during rotational tensioning, preventing uneven prestress distribution or anchor loosening due to misalignment.

[0071] The above description is merely an exemplary embodiment of the present invention and does not limit the scope of protection of the present invention. Any equivalent structural transformations made based on the technical concept of the present invention and the contents of the specification and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present invention.

Claims

1. A tensioning device for producing track slabs, wherein a tensioning rod is inserted inside the track slab, the tensioning rod is connected to prestressed steel bars inside the track slab, and the two ends of the tensioning rod along its axial direction are a limiting end and a screwing end, characterized in that, The tensioning device for track slab production includes: A limiting structure is sleeved on the limiting end and abuts against the track plate; A guide structure is sleeved on the screwing end and is positioned close to the track plate. A screwing structure is provided, which is positioned corresponding to the screwing end. A screwing space is provided between the screwing structure and the guide structure. The screwing end passes through the guide structure and extends into the screwing structure through the screwing space. The screwing structure is used to drive the screwing end to rotate so that the tension rod stretches the prestressed steel bar. A lifting structure is provided, wherein the limiting structure, the guiding structure, and the screwing structure are spaced apart along the axial direction of the tension rod. The lifting structure is used to drive the limiting structure, the guiding structure, and the screwing structure to rise and fall, so that the limiting structure corresponds to the position of the limiting end, and the guiding structure and the screwing structure correspond to the position of the screwing end. The lifting structure includes a support frame, a mounting frame, and a lifting drive component. The mounting frame extends horizontally and is framed outside the track plate. The support frame extends vertically. The connecting end of the lifting drive component is installed on the support frame, and the output end of the lifting drive component is installed on the mounting frame. The limiting structure, the guiding structure, and the screwing structure are spaced apart along the axial direction of the tension rod on the mounting frame. The lifting drive component is used to drive the mounting frame to rise and fall, thereby driving the limiting structure, the guiding structure, and the screwing structure to rise and fall. The screwing structure includes a mounting base, a first driving component, and a transmission assembly. The mounting base is installed on the lifting structure at the position corresponding to the screwing end. The first driving component is installed on the mounting base. The output end of the first driving component is connected to the screwing end through the transmission assembly and is used to drive the screwing end to rotate. The limiting structure includes a limiting seat, a limiting ring, a limiting rod, and a limiting head. The limiting seat is installed on the mounting frame at the position corresponding to the limiting end. The limiting ring is rotatably installed on the limiting seat and sleeved on the limiting end. The limiting rod is installed at the bottom end of the limiting seat and extends along the axial direction of the tension rod. The limiting head is installed between the limiting rod and the track plate, and the limiting rod abuts against the track plate through the limiting head.

2. The tensioning device for track slab production as described in claim 1, characterized in that, The support frame includes multiple crossbeams and multiple columns. The multiple crossbeams surround the track plate around its circumference and are located above the track plate. The multiple columns are distributed around the track plate. Adjacent crossbeams are connected by a column. The mounting frame is located inside the multiple crossbeams and below the multiple crossbeams. The connecting end of the lifting drive component is mounted on the crossbeam.

3. The tensioning device for track slab production as described in claim 1, characterized in that, The connecting end of the lifting drive component is mounted on the support frame via a first hinge seat, and the output end of the lifting drive component is mounted on the mounting frame via a second hinge seat.

4. The tensioning device for track slab production as described in any one of claims 1 to 3, characterized in that, The transmission assembly includes a connecting sleeve and a driving sleeve. The driving sleeve is fitted onto the output end of the first driving component, and the connecting sleeve is fitted onto the screwing end. The driving sleeve has a connection port on its side facing the screwing end, and the connection port extends axially along the driving sleeve. The outer wall of the driving sleeve has a connection socket, and the connection socket extends radially along the driving sleeve. The connection socket communicates with the connecting port. The connecting sleeve has a connection hole corresponding to the position of the connection socket, and the connection hole extends radially along the connecting sleeve. The connecting sleeve is inserted into the connection port, and the connection hole and the connection socket are connected by a pin.

5. The tensioning device for track slab production as described in any one of claims 1 to 3, characterized in that, The guide structure includes a guide seat and a guide ring. The guide seat is installed on the lifting structure at the position corresponding to the screwing end. The guide ring is rotatably installed on the guide seat. A screwing space is provided between the guide seat and the screwing structure. The screwing end passes through the guide ring and the guide seat and extends into the screwing structure.

6. The tensioning device for track slab production as described in claim 5, characterized in that, The track plate is provided with a first anchoring hole at the position corresponding to the screwing end, and the screwing end is fitted with a first anchoring nut; the guide structure also includes a second driving member, the second driving member is installed on the guide seat, the output end of the second driving member is connected to the guide ring, the guide ring is fitted outside the first anchoring nut, and the second driving member is used to drive the guide ring to rotate so as to screw the first anchoring nut into the first anchoring hole.

7. The tensioning device for track slab production as described in any one of claims 1 to 3, characterized in that, The track plate is provided with a second anchoring hole at the position corresponding to the limiting end, and the limiting end is fitted with a second anchoring nut; the limiting structure also includes a third driving member, the third driving member is installed on the limiting seat, the output end of the third driving member is connected to the limiting ring, the limiting ring is fitted outside the second anchoring nut, and the third driving member is used to drive the limiting ring to rotate so as to screw the second anchoring nut into the second anchoring hole.

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