Tension rod screwing mechanism for track slab production

Abstract

The utility model discloses a kind of tension rod screwing mechanism for track slab production, it is related to track slab production technical field, wherein, the tension rod screwing mechanism for track slab production includes limiting structure, guide structure and screwing structure, limiting structure is sleeved in limiting end;Guide structure is sleeved in screwing end;Screwing structure is set corresponding to the position of screwing end, limiting structure, screwing structure and guide structure are spaced apart along the axial direction of tension rod, screwing end passes through guide structure and is inserted into screwing structure through screwing space, screwing structure is used to drive screwing end rotation, to make tension rod stretch prestressed steel bar.The utility model is through the synergic effect of limiting structure, guide structure and screwing structure, form stable constraint in the axial direction of tension rod two ends, effectively prevent tension rod deviation in screwing process, ensure that prestressed steel bar is uniformly stressed, make tension rod keep predetermined rotation axis, improve the screwing stability of tension rod, to ensure that prestressed steel bar is uniformly stressed.

Description

Technical Field

[0001] This utility model relates to the field of track slab production technology, and in particular to a tension rod screwing mechanism for track slab production. Background Technology

[0002] As a key load-bearing component in high-speed railways and urban rail transit systems, the structural strength and durability of track slabs directly affect the safe operation of the track system. During track slab manufacturing, the tensioning process of prestressed steel bars is a crucial step in ensuring the load-bearing performance of the track slab. Traditional tensioning processes mainly rely on manual operation or simple mechanical devices to tighten the tension rods.

[0003] However, in traditional tensioning processes, the tension rod is prone to radial displacement during the tightening process, resulting in uneven stress on the prestressed steel bars. Utility Model Content

[0004] The main purpose of this invention is to propose a tension rod screwing mechanism for track slab production, which aims to improve the screwing stability of the tension rod and ensure uniform stress on the prestressed steel bars.

[0005] To achieve the above objectives, this utility model proposes a tension rod tightening mechanism for track slab production. The tension rod passes through the track slab and is connected to the prestressed steel bars within the track slab. The tension rod has a limiting end and a tightening end at its two axial ends. The tension rod tightening mechanism 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. The limiting structure, the screwing structure, and the guiding structure are spaced apart along the axial direction of the tension rod. A screwing space is provided between the screwing structure and the guiding structure. The screwing end passes through the guiding 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] In one embodiment, the screwing structure includes a mounting base, a first driving member, and a transmission assembly. The outer frame of the track plate is provided with a mounting bracket. The mounting base is installed on the mounting bracket at a position corresponding to the screwing end. The first driving member is installed on the mounting base. 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.

[0010] In one embodiment, the transmission assembly includes a connecting sleeve and a driving sleeve, the driving sleeve being sleeved on the output end of the first driving member, the connecting sleeve being sleeved on the screwing end, and the connecting sleeve being detachably connected to the driving sleeve.

[0011] In one embodiment, the drive bushing has a connection port on the side facing the screw end, the connection port extends axially along the drive bushing, the outer wall of the drive bushing has a connection socket, the connection socket extends radially along the drive bushing, the connection socket communicates with the connection port, the connecting bushing has a connection hole corresponding to the position of the connection socket, the connection hole extends radially along the connecting bushing, the connecting bushing is inserted into the connection port, and the connection hole and the connection socket are connected by a pin.

[0012] In one embodiment, the guide structure includes a guide seat and a guide ring. The guide seat is mounted on the mounting bracket at a position corresponding to the mounting base. The guide ring is rotatably mounted on the guide seat. A screwing space is provided between the guide seat and the mounting base. The transmission assembly is disposed within the screwing space. The screwing end passes through the guide ring and the guide seat and extends into the transmission assembly.

[0013] 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.

[0014] In one embodiment, the limiting structure includes a limiting seat and a limiting ring. The limiting seat is installed on the mounting frame at a position corresponding to the limiting end, and the limiting ring is rotatably installed on the limiting seat and sleeved on the limiting end.

[0015] In one embodiment, the limiting structure further includes a limiting component, which is installed at the bottom end of the limiting seat, extends along the axial direction of the tension rod, and one end of the limiting component abuts against the track plate.

[0016] In one embodiment, the limiting assembly includes a limiting rod and a limiting head. 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.

[0017] 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.

[0018] This invention utilizes the synergistic effect of a limiting structure, a guiding structure, and a tightening structure to create stable constraints at both ends of the tension rod along its axial direction. This effectively prevents the tension rod from shifting during tightening, ensuring uniform stress on the prestressed steel bars and maintaining the tension rod on its predetermined axis of rotation. It simplifies the complex positioning system of traditional tensioning equipment, reduces the technical requirements for operators, and improves the tensioning accuracy and operational efficiency of the track slab. Furthermore, it achieves axial stability control during the tightening process of the tension rod, improves its tightening stability, eliminates prestress deviation caused by tightening offset, and ensures uniform stress on the prestressed steel bars. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 A schematic diagram of an embodiment of the tension rod screwing mechanism for track slab production provided by this utility model;

[0021] Figure 2 This is a schematic diagram of an embodiment of the guide structure and screwing structure involved in this utility model;

[0022] Figure 3 for Figure 2 A magnified view of a section at point A in the middle;

[0023] Figure 4 This is a schematic diagram of an embodiment of the limiting structure involved in this utility model;

[0024] Figure 5 for Figure 4 A magnified view of a section at point B in the middle;

[0025] Figure 6 This is a schematic diagram of an embodiment of the limiting structure, guiding structure, or screwing structure involved in this utility model.

[0026] Explanation of icon numbers:

[0027] 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;

[0028] 100, Limiting structure; 200, Guide structure; 300, Tightening structure; 400, Mounting bracket; 201, Tightening 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.

[0029] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0031] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators 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 indicators will also change accordingly.

[0032] Furthermore, if the embodiments of this utility model 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. Therefore, 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 utility model.

[0033] As a key load-bearing component in high-speed railways and urban rail transit systems, the structural strength and durability of track slabs directly affect the safe operation of the track system. During track slab manufacturing, the tensioning process of prestressed steel bars is a crucial step in ensuring the load-bearing performance of the track slab. Traditional tensioning processes mainly rely on manual operation or simple mechanical devices to tighten the tension rods.

[0034] In manual tightening, operators need to maintain high-intensity work for extended periods, which can easily lead to fatigue errors and uneven tension. Furthermore, manual operation makes it difficult to control the tightening angle and torque, affecting the uniformity of stress distribution in the prestressed steel bars.

[0035] While existing mechanical screw-tightening devices improve work efficiency to some extent, they lack an effective axial positioning mechanism in practical applications. During the screw-tightening process, the tension rod is prone to radial displacement, resulting in uneven stress on the prestressed steel bars.

[0036] To solve this technical problem, this utility model proposes a tension rod screwing mechanism for track slab production.

[0037] Please see Figure 1 , Figure 2 and Figure 4 In one embodiment of this utility model, the tension rod 10 passes through the track slab 20 and is connected to the prestressed steel bars inside the track slab 20. The two ends of the tension rod 10 along its axial direction are a limiting end 11 and a tightening end 12, respectively. The tension rod tightening mechanism for track slab production includes a limiting structure 100, a guiding structure 200, and a tightening structure 300. 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 tightening end 12, and the guiding structure 200... The 00 is positioned close to the track slab 20; the screwing structure 300 is positioned corresponding to the screwing end 12; the limiting structure 100, the screwing structure 300, and the guide structure 200 are spaced apart along the axial direction of the tension rod 10; a screwing space 201 is provided between the screwing structure 300 and the guide structure 200; the screwing end 12 passes through the guide structure 200 and extends into the screwing structure 300 through the screwing space 201; the screwing structure 300 is used to drive the screwing end 12 to rotate, so that the tension rod 10 stretches the prestressed steel bars.

[0038] Specifically, the limiting structure 100 refers to the fixing device that wraps around the limiting end 11 of the tension rod 10. It can be a sleeve structure with an annular support surface, whose inner wall matches the outer diameter of the limiting end 11. It abuts against the surface of the track plate 20 through mechanical locking or elastic clamping to prevent the tension rod 10 from radially shifting. The guiding structure 200 refers to the guiding device set on the outside of the turning end 12, such as a guide ring 220 with a sliding bearing, which can constrain the rotation trajectory of the turning end 12 and ensure axial alignment. The turning space 201 refers to the operating area between the drive device and the guiding device. Its axial length can be adjusted according to the thread stroke of the tension rod 10, for example, set to 1.2 to 1.5 times the effective thread length, to provide sufficient operating space for turning.

[0039] More specifically, after the tension rod 10 is inserted into the track slab 20, the limiting structure 100 is sleeved on its limiting end 11 and presses against the surface of the track slab 20 to form a fixed fulcrum. The guide structure 200 is sleeved on the screwing end 12 and installed close to the track slab 20, and the two together constrain the rotation axis of the tension rod 10. The driving component in the screwing structure 300 is connected to the screwing end 12 through the transmission assembly 330, generating rotational torque within the screwing space 201. During driving, the screwing end 12 rotates axially under the constraint of the guide structure 200, causing the tension rod 10 to stretch the steel bar and generate prestress, while the limiting structure 100 prevents the overall displacement of the tension rod 10, forming a stable tensile force transmission path.

[0040] Compared to existing technologies, traditional devices, which are fixed on only one side, are prone to misalignment during rotation. This solution, however, uses three-point positioning to form a stable rotation axis. Existing technologies require manual adjustment for centering, while this solution uses a guide ring 220 to automatically correct the rotation trajectory. Existing rotation devices have complex structures, but this solution simplifies the installation process by using three spaced-apart components. For example, the limiting structure 100 and the guide structure 200 can be pre-installed on the track plate 20 mold, while the rotation structure 300 can be independently installed on an external support.

[0041] In the technical solution provided by this utility model, through the synergistic effect of the limiting structure 100, the guiding structure 200, and the screwing structure 300, stable constraints are formed at both ends of the tension rod 10 along the axial direction, effectively preventing the tension rod 10 from deviating during the screwing process, ensuring uniform stress on the prestressed steel bars, and keeping the tension rod 10 on the predetermined axis of rotation. This simplifies the complex positioning system of traditional tensioning equipment, reduces the technical requirements for operators, and improves the tensioning accuracy and operational efficiency of the track slab 20. It achieves axial stability control during the screwing process of the tension rod 10, improves the screwing stability of the tension rod 10, eliminates prestress deviation caused by screwing deviation, and ensures uniform stress on the prestressed steel bars.

[0042] Please continue reading. Figure 2 And see Figure 3 and Figure 6In an embodiment of this utility model, the screwing structure 300 includes a mounting base 310, a first driving member 320, and a transmission assembly 330. The outer frame of the track plate 20 is provided with a mounting bracket 400. The mounting base 310 is mounted on the mounting bracket 400 at the position corresponding to the screwing end 12. The first driving member 320 is mounted 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.

[0043] Specifically, the mounting base 310 refers to the support structure used to fix the first driving component 320, which can be implemented using a welded steel plate frame or a cast base. It is bolted to the mounting frame 400 to form a stable load-bearing platform. The first driving component 320 refers to the power output device, which can be implemented using a servo motor or a hydraulic motor. Its output end is connected to the transmission assembly 330 through a coupling to transmit torque. The transmission assembly 330 refers to the power transmission mechanism, which can be implemented using a gear set or a sprocket and chain structure. Its input end is connected to the first driving component 320, and its output end is detachably connected to the screwing end 12. The mounting frame 400 refers to the fixed support structure of the track plate 20 production line, which can be implemented using a welded steel frame. Its surface has pre-set mounting holes for fixing the mounting base 310.

[0044] More specifically, the mounting base 310 is fixed to a preset position on the mounting frame 400 by bolts, and the first drive component 320 is vertically mounted on the top of the mounting base 310. The driving gear in the transmission assembly 330 is keyed to the output shaft of the first drive component 320, and the driven gear is splined to the screwing end 12. When the first drive component 320 is activated, the driving gear drives the driven gear to rotate, thereby driving the screwing end 12 to produce circumferential motion. The mounting frame 400 is adjustable to the outer frame of the track plate 20. By adjusting the horizontal position of the mounting base 310, the transmission assembly 330 and the screwing ends 12 of tension rods 10 of different specifications are kept coaxially aligned.

[0045] Compared with existing technologies, traditional screw-tightening devices use an integral power unit to directly drive the tension rod 10, which suffers from fixed installation positions and difficulties in adjustment. This embodiment decomposes the drive unit into a mounting base 310, a first drive component 320, and a transmission assembly 330, enabling rapid assembly and disassembly of the power unit and the track slab 20 mounting frame 400. The transmission assembly 330 adopts a split structure, ensuring efficient power transmission while facilitating the replacement of suitable components according to the size of the tension rod 10. The preset mounting holes of the mounting frame 400 cooperate with the adjustment mechanism of the mounting base 310 to adapt to different track slab 20 production line layouts. This effectively solves the technical defects of traditional screw-tightening devices, such as complex structure and difficult debugging. It makes equipment maintenance and component replacement more convenient, and the split transmission structure reduces the requirements for machining accuracy and improves equipment versatility. It avoids axial offset during the screw-tightening process, ensuring that the rotation center of the tension rod 10 coincides with the axis of the prestressed steel bar, thereby improving the stability and accuracy of the tensioning operation.

[0046] Please continue reading. Figure 3 In an embodiment of this utility model, the transmission assembly 330 includes a connecting bushing 331 and a driving bushing 332. The driving bushing 332 is sleeved on the output end of the first driving member 320, and the connecting bushing 331 is sleeved on the screwing end 12. The connecting bushing 331 is detachably connected to the driving bushing 332.

[0047] Specifically, the drive sleeve 332 refers to a sleeve structure rigidly connected to the output end of the first drive member 320. It can be implemented using a metal sleeve with an internal hexagonal hole or a spline hole, and is used to transmit the rotational power of the first drive member 320 to the connecting sleeve 331. The connecting sleeve 331 refers to a sleeve structure that mates with the screwing end 12. It can be implemented using a metal sleeve with anti-slip textures or grooves on the inner wall, and is used to clamp the screwing end 12 and transmit torque. Detachable connection means that the drive sleeve 332 and the connecting sleeve 331 can be quickly separated by means of pins, snaps, or threads, which facilitates the replacement of the connecting sleeve 331 with a suitable one according to the specifications of the tension rod 10.

[0048] More specifically, the drive bushing 332 is fixedly connected to the output shaft of the first drive member 320 via an internal hexagonal socket, and the connecting bushing 331 transmits friction with the screwing end 12 through anti-slip grooves. When installation is required, the connecting bushing 331 is inserted into the axial connection port 301 of the drive bushing 332 and locked by a radial pin. During screwing, the first drive member 320 drives the connecting bushing 331 to rotate via the drive bushing 332, thereby driving the screwing end 12 to rotate. For disassembly, only the pin needs to be pulled out to separate the drive bushing 332 and the connecting bushing 331; it is not necessary to disassemble the first drive member 320 or the mounting base 310.

[0049] This embodiment achieves rapid adaptation to tension rods 10 of different specifications by combining a detachable drive bushing 332 with a connecting bushing 331, while simplifying the maintenance process of the transmission assembly 330. It solves the problems of poor versatility and low maintenance efficiency of the existing tension rod 10 screwing mechanism transmission assembly 330, enabling rapid replacement of the transmission assembly 330, reducing equipment modification costs, and ensuring stable transmission of screwing torque.

[0050] Please continue reading. Figure 3 In an embodiment of this utility model, a connection port 301 is provided on the side of the drive bushing 332 facing the screw end 12. The connection port 301 extends axially along the drive bushing 332. A connection socket 302 is provided on the outer wall of the drive bushing 332. The connection socket 302 extends radially along the drive bushing 332. The connection socket 302 communicates with the connection port 301. A connection hole 303 is provided on the connecting bushing 331 at the position corresponding to the connection socket 302. The connection hole 303 extends radially along the connecting bushing 331. The connecting bushing 331 is inserted into the connection port 301. The connection hole 303 and the connection socket 302 are connected by a pin.

[0051] Specifically, the connection port 301 refers to the axial opening at the end of the drive bushing 332 for accommodating the insertion of the connecting bushing 331. It can be implemented using a cylindrical structure with an inner diameter slightly larger than the outer diameter of the connecting bushing 331, enabling axial connection between the connecting bushing 331 and the drive bushing 332. The connection socket 302 refers to a radial through hole on the side wall of the drive bushing 332. It can be implemented using a cylindrical channel perpendicular to the axial direction, forming a pin insertion channel with the connection hole 303 of the connecting bushing 331. The connection hole 303 refers to a radial through hole on the side wall of the connecting bushing 331. It can be implemented using a hole structure coaxial with and matching the diameter of the connection socket 302, forming a through channel with the connection socket 302 after the connecting bushing 331 is inserted into the drive bushing 332. The pin connection refers to the mechanical connection method in which a metal pin passes through the connecting socket 302 and the connecting hole 303. It can be achieved by using a cylindrical steel pin in conjunction with an elastic buckle, and is used to achieve quick and easy detachable fixing of the drive bushing 332 and the connecting bushing 331.

[0052] More specifically, a connection port 301 is provided at the axial end of the drive bushing 332, allowing the connecting bushing 331 to be inserted axially into the drive bushing 332. When the connecting bushing 331 is fully inserted, the connection hole 303 on its side wall and the connection port 302 on the side wall of the drive bushing 332 form a radially penetrating channel. Inserting a pin radially into this channel then achieves circumferential locking between the drive bushing 332 and the connecting bushing 331. This structure, through axial insertion and radial pin fixing, ensures effective transmission of torque and enables quick assembly and disassembly of the two bushings. During disassembly, simply pulling out the pin separates the drive bushing 332 from the connecting bushing 331, eliminating the need for complex tools or threaded loosening operations.

[0053] This embodiment, through a pin-connection structure, significantly shortens the assembly time of the transmission assembly 330 while ensuring connection strength. It also facilitates the replacement of matching connecting bushings 331 for tension rods 10 of different specifications. This enables rapid assembly and disassembly of the drive bushing 332 and connecting bushing 331, solving the problems of cumbersome installation and debugging and poor versatility of the transmission assembly 330 in the prior art. It improves the equipment's adaptability to tension rods 10 of different specifications and reduces maintenance costs.

[0054] Please continue reading. Figure 2 and Figure 6 And see Figure 3 In an embodiment of this utility model, the guide structure 200 includes a guide seat 210 and a guide ring 220. The guide seat 210 is mounted on the mounting frame 400 at a position corresponding to the mounting base 310. The guide ring 220 is rotatably mounted on the guide seat 210. A screwing space 201 is provided between the guide seat 210 and the mounting base 310. The transmission assembly 330 is disposed in the screwing space 201. The screwing end 12 passes through the guide ring 220 and the guide seat 210 and extends into the transmission assembly 330.

[0055] Specifically, the guide seat 210 is a support component used to fix the installation position. It can be implemented using a metal base with a flange, which is fixed to the mounting bracket 400 by bolts, providing an axial positioning reference for the screwing end 12. The guide ring 220 is a rotating component sleeved on the outside of the screwing end 12. It can be implemented using a ring structure with ball bearings. Its inner wall maintains a clearance fit with the screwing end 12, allowing the screwing end 12 to rotate freely. The screwing space 201 is the area located between the guide seat 210 and the mounting base 310. It can be formed by adjusting the installation distance between the guide seat 210 and the mounting bracket 400, and is used to accommodate the transmission assembly 330 and ensure the coaxial alignment of the screwing end 12 and the transmission assembly 330.

[0056] More specifically, the guide seat 210 is fixedly connected to the mounting bracket 400 via a flange, and its axis is aligned with the axial direction of the tension rod 10. The guide ring 220 is mounted in the inner hole of the guide seat 210 via ball bearings. The screwing end 12 passes through the inner hole of the guide ring 220 and enters the screwing space 201, where it docks with the connecting sleeve 331 in the transmission assembly 330. When the first drive member 320 drives the screwing end 12 to rotate via the transmission assembly 330, the guide ring 220 rotates synchronously with the screwing end 12, but is constrained by the guide seat 210 and cannot undergo radial displacement. At this time, the screwing space 201 provides sufficient operating space for the docking of the connecting sleeve 331 and the drive sleeve 332 of the transmission assembly 330, while avoiding interference between the transmission assembly 330 and the track plate 20.

[0057] This embodiment, through the cooperation of the guide seat 210 and the guide ring 220, forms a double constraint during the rotation of the screwing end 12, ensuring the coaxiality of the screwing end 12 and the transmission assembly 330, while preventing the connecting sleeve 331 from disengaging due to vibration. This solves the problem of uneven stress on the prestressed steel bars caused by rotational offset during the screwing of the tension rod 10. The combined structure of the guide ring 220 and the guide seat 210 ensures that the screwing end 12 always moves along a predetermined axis during rotation, guaranteeing linear tension of the tension rod 10 and the prestressed steel bars, and preventing thread wear or connection failure caused by eccentric rotation. Simultaneously, the screwing space 201 simplifies the installation process of the transmission assembly 330, enabling rapid docking of the drive sleeve 332 and the connecting sleeve 331 without additional adjustments.

[0058] Please continue reading. Figure 3 In an embodiment of this utility model, 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.

[0059] Specifically, the second driving component 230 refers to a power unit independent of the first driving component 320. It can be implemented using a servo motor or a hydraulic motor. Its output end is connected to the guide ring 220 via a coupling or gear set, and is used to independently control the screwing action of the first anchoring nut 13 after the tension rod 10 has completed its tensioning. The guide ring 220 is a ring-shaped component with internal threads. Its inner diameter matches the outer diameter of the first anchoring nut 13. It can adopt a split structure to accommodate nuts of different sizes. The nut is pushed into the anchoring hole by rotational movement. The first anchoring nut 13 is a fastener with external threads. It can be made of high-strength alloy steel. Its thread direction is opposite to the rotation direction of the tension rod 10, ensuring that it will not screw into the anchoring hole on its own when the first driving component 320 drives the tension rod 10 to rotate and stretch. The first anchoring hole 21 is a pre-set threaded hole on the surface of the track plate 20. It can be formed by pre-embedded sleeves or direct tapping. Its position is coaxially aligned with the screwing end 12 of the tension rod 10, and is used to fix the anchoring nut.

[0060] More specifically, after the tension rod 10 completes the tensioning of the prestressed steel bars, the second drive member 230 is activated and drives the guide ring 220 to rotate. Since the internal thread of the guide ring 220 engages with the external thread of the first anchoring nut 13, the rotation of the guide ring 220 will push the first anchoring nut 13 to move axially until it is fully screwed into the first anchoring hole 21. During this process, the first drive member 320 remains stationary to prevent the rotation of the tension rod 10 from interfering with the anchoring action. The rotation speed of the guide ring 220 can be adjusted by the control system of the second drive member 230, for example, by using closed-loop feedback control, to ensure that the nut screwing torque meets the preset standard.

[0061] This embodiment integrates the second driving component 230 and the guide ring 220, and directly utilizes the axial positioning function of the guide structure 200 after tensioning to achieve automated and precise screwing of the nut without manual intervention. This solves the problems of low installation efficiency and poor alignment accuracy of the anchor nut, realizing continuous automated operation of the tensioning and anchoring processes. It also avoids accidental screwing of the anchor nut due to rotation of the tensioning rod 10, ensuring stable and controllable tension force of the prestressed steel bars.

[0062] Please continue reading. Figure 4 and Figure 6 And see Figure 5 In an embodiment of this utility model, the limiting structure 100 includes a limiting seat 110 and a limiting ring 120. The limiting seat 110 is installed on the mounting frame 400 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.

[0063] Specifically, the limiting seat 110 refers to the support structure fixedly installed on the mounting bracket 400 of the outer frame of the track slab 20. It can be implemented by welding or bolting and is used to provide a stable installation base for the limiting ring 120. The limiting ring 120 refers to the annular component rotatably nested within the limiting seat 110. It can be implemented using a bearing or sliding sleeve structure, and its inner diameter matches the outer diameter of the limiting end 11 of the tension rod 10, used to constrain the radial offset of the tension rod 10. The mounting bracket 400 refers to the load-bearing frame fixed to the outer frame of the track slab 20. It can be formed by welding steel structure and is used to provide an installation positioning reference for the limiting seat 110 and the screwing structure 300.

[0064] More specifically, the limiting seat 110 is fixed to the mounting bracket 400 by bolts or welding, and its position is axially aligned with the limiting end 11 of the tension rod 10. The limiting ring 120 is installed in the limiting seat 110 by a bearing or sliding sleeve structure and can rotate freely around the axis of the tension rod 10. The limiting end 11 of the tension rod 10 passes through and is wrapped by the limiting ring 120. During the tightening process, the limiting ring 120 rotates synchronously with the rotation of the tension rod 10, while the limiting seat 110 restricts the radial displacement of the tension rod 10 through a rigid connection. Thus, when the tension rod 10 is rotating to stretch the prestressed steel bar, the coaxiality between the limiting end 11 and the tightening end 12 is maintained, avoiding uneven prestress distribution or connection failure caused by eccentricity.

[0065] In this embodiment, the cooperation of the limiting seat 110 and the limiting ring 120 allows the tension rod 10 to rotate freely while forcibly restricting its radial displacement, ensuring that the tension rod 10 always moves along the preset axis. This solves the problem of displacement caused by the lack of effective limiting during the tightening process of the tension rod 10. Through the synergistic effect of the rigid limiting seat 110 and the rotatable limiting ring 120, the rotational freedom of the tension rod 10 is guaranteed, while the influence of radial displacement on the tensioning accuracy is eliminated, thereby improving the uniformity and stability of the prestressed steel bar tensioning.

[0066] Please continue reading. Figure 5 In an embodiment of this utility model, the limiting structure 100 further includes a limiting component, which is installed at the bottom end of the limiting seat 110. The limiting component extends along the axial direction of the tension rod 10, and one end of the limiting component abuts against the track plate 20.

[0067] Specifically, the limiting rod 130 refers to a rigid support component extending axially along the tension rod 10. It can be implemented using threaded steel or alloy steel columns, and its length can be adjusted according to the thickness of the track slab 20. It is used to transmit axial pressure. The limiting head 140 refers to a contact component located at the end of the limiting rod 130. It can be implemented using a metal disc with a rubber buffer layer. It is used to disperse contact stress and prevent damage to the surface of the track slab 20.

[0068] More specifically, the limiting rod 130 is vertically fixed to the bottom of the limiting seat 110, and its extension direction is parallel to the axis of the tension rod 10. After the limiting seat 110 is positioned with the mounting frame 400, the limiting rod 130 drives the limiting head 140 to move downwards until it is in complete contact with the surface of the track slab 20. During the rotation of the tension rod 10, the limiting head 140 continuously applies vertical pressure to counteract the radial offset tendency of the tension rod 10 caused by torque. The axial rigid support of the limiting rod 130 and the buffer contact of the limiting head 140 cooperate to form a double constraint mechanism, ensuring that the tension rod 10 always maintains axial alignment when tensioning the prestressed steel bars.

[0069] In this embodiment, the axially extending limiting rod 130 directly contacts the track slab 20, forming a continuous support throughout the entire tensioning stroke, significantly improving the resistance to offset. This solves the problem of radial offset caused by torque during high-speed rotation of the tensioning rod 10, and avoids uneven stress on the prestressed steel bars caused by axial misalignment. The flexible contact between the limiting head 140 and the track slab 20 prevents surface damage to the track slab 20 caused by rigid collisions, achieving the dual effects of high-precision positioning and equipment protection during the tensioning process.

[0070] Please continue reading. Figure 5 In an embodiment of this utility model, the limiting component includes a limiting rod 130 and a limiting head 140. 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.

[0071] Specifically, the limiting rod 130 is a rigid support component extending axially along the tension rod 10. It can be made of threaded steel or alloy rod, with its bottom end connected to the limiting seat 110 and its top end transmitting pressure through the limiting head 140. This component is used to form axial constraint during tensioning, preventing the limiting end 11 from shifting due to rotation. The limiting head 140 is a buffer component located on the contact surface between the limiting rod 130 and the track slab 20. It can be made of a metal block with rubber pads, and its surface can be flat or have a grooved structure. This component is used to disperse the local pressure of the limiting rod 130 on the track slab 20, avoiding damage to the surface of the track slab 20 due to direct contact, while enhancing the contact stability between the limiting component and the track slab 20.

[0072] More specifically, the limiting rod 130 is vertically fixed to the bottom of the limiting seat 110 by bolts or welding, and its length can be adjusted according to the thickness of the track slab 20. The limiting head 140 is installed at the end of the limiting rod 130 by a threaded connection or a snap-fit ​​structure, and the side in contact with the track slab 20 can be covered with elastic material. During the tightening of the tension rod 10, the axial extension direction of the limiting rod 130 remains parallel to the axis of the tension rod 10, and the limiting head 140 is pressed tightly against the surface of the side wall of the track slab 20, forming a three-point support structure, thereby suppressing the offset of the tension rod 10 during rotation.

[0073] In some specific embodiments, the limiting head 140 is a detachable structure, for example, connected to the limiting rod 130 by a pin or quick-release bolt, which facilitates the replacement of limiting heads 140 of different shapes according to the flatness of the track plate 20 surface. The contact area between the limiting head 140 and the track plate 20 can be 2 to 3 times the cross-sectional area of ​​the limiting rod 130 to reduce the pressure per unit area.

[0074] This embodiment achieves adjustable axial constraint through the combination of the limiting rod 130 and the limiting head 140, while also providing buffer protection for the surface of the track plate 20. Furthermore, the axial extension characteristic of the limiting rod 130 allows it to compensate for positional deviations between the mounting frame 400 and the track plate 20, preventing limiting failure due to misalignment.

[0075] Please continue reading. Figure 5 In an embodiment of this utility model, 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.

[0076] Specifically, the second anchoring hole 22 refers to a threaded hole on the surface of the track plate 20, which can be formed by drilling, and is used to accommodate the screwing in of the second anchoring nut 14. The second anchoring nut 14 is a fastener with external threads, which can be made of high-strength alloy material, and is used to axially fix the limiting end 11 after the tension rod 10 has been stretched. The third driving component 150 refers to an actuator that provides rotational power, which can be implemented by a servo motor or a stepper motor, and transmits torque through a mechanical connection between its output end and the limiting ring 120. The limiting ring 120 is a rotating sleeve with internal threads, which can be a split structure, and its inner diameter matches the outer diameter of the second anchoring nut 14, and is used to push the nut to move axially along the second anchoring hole 22 during rotation.

[0077] More specifically, after the tension rod 10 completes the tensioning of the prestressed steel bars, the third drive component 150 is activated and drives the limiting ring 120 to rotate. Since the internal thread of the limiting ring 120 engages with the external thread of the second anchoring nut 14, the rotational motion is converted into a linear movement of the nut along the axial direction of the second anchoring hole 22. During this process, the rotation direction of the limiting ring 120 is opposite to the rotation direction of the tension rod 10 during operation, ensuring that the second anchoring nut 14 will not accidentally screw into the anchoring hole during the tensioning stage of the tension rod 10. After the third drive component 150 completes the rotational motion according to preset parameters, the second anchoring nut 14 is fully embedded in the second anchoring hole 22, forming a rigid constraint on the limiting end 11.

[0078] In this embodiment, the rotation of the limiting ring 120 is directly controlled by an independently configured third driving component 150, achieving precise screwing in of the anchor nut and avoiding the risk of anchoring failure due to conflicting thread directions. This ensures that the anchor nut is screwed into the anchor hole only during a preset process stage, eliminating the possibility of accidental loosening of the anchor during tensioning and improving the stability and anchoring reliability of the prestressed steel reinforcement tensioning process.

[0079] The above description is merely an exemplary embodiment of the present utility model and does not limit the scope of protection of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the scope of protection of the present utility model.

Claims

1. A tension rod tightening mechanism for track slab production, wherein the tension rod passes through the track slab, the tension rod is connected to the prestressed steel bars within the track slab, and the two ends of the tension rod along its axial direction are a limiting end and a tightening end, characterized in that, The tension rod screwing mechanism 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. The limiting structure, the screwing structure, and the guiding structure are spaced apart along the axial direction of the tension rod. A screwing space is provided between the screwing structure and the guiding structure. The screwing end passes through the guiding 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.

2. The tension rod screwing mechanism for track slab production as described in claim 1, characterized in that, The screwing structure includes a mounting base, a first driving component, and a transmission assembly. The outer frame of the track plate is provided with a mounting bracket. The mounting base is installed on the mounting bracket corresponding to the position of 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.

3. The tension rod screwing mechanism for track slab production as described in claim 2, characterized in that, The transmission assembly includes a connecting bushing and a driving bushing. The driving bushing is sleeved on the output end of the first driving member, and the connecting bushing is sleeved on the screwing end. The connecting bushing is detachably connected to the driving bushing.

4. The tension rod screwing mechanism for track slab production as described in claim 3, characterized in that, The drive bushing has a connection port on the side facing the screw end, the connection port extends axially along the drive bushing, the outer wall of the drive bushing has a connection socket, the connection socket extends radially along the drive bushing, the connection socket communicates with the connection port, the connecting bushing has a connection hole corresponding to the position of the connection socket, the connection hole extends radially along the connecting bushing, the connecting bushing is inserted into the connection port, and the connection hole and the connection socket are connected by a pin.

5. The tension rod screwing mechanism for track slab production as described in claim 2, characterized in that, The guiding structure includes a guide seat and a guide ring. The guide seat is installed on the mounting frame at a position corresponding to the mounting base. The guide ring is rotatably installed on the guide seat. A screwing space is provided between the guide seat and the mounting base. The transmission assembly is disposed in the screwing space. The screwing end passes through the guide ring and the guide seat and extends into the transmission assembly.

6. The tension rod screwing mechanism 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 tension rod screwing mechanism for track slab production as described in claim 2, characterized in that, The limiting structure includes a limiting seat and a limiting ring. 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 is sleeved on the limiting end.

8. The tension rod screwing mechanism for track slab production as described in claim 7, characterized in that, The limiting structure also includes a limiting component, which is installed at the bottom end of the limiting seat. The limiting component extends along the axial direction of the tension rod, and one end of the limiting component abuts against the track plate.

9. The tension rod screwing mechanism for track slab production as described in claim 8, characterized in that, The limiting assembly includes a limiting rod and a limiting head. 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.

10. The tension rod screwing mechanism for track slab production as described in claim 7, 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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