Track bolt tightening device

Abstract

The invention discloses a track bolt tightening device, and relates to the technical field of bolt tightening equipment, the track bolt tightening device comprises a wrench mounting rack, one end of the wrench mounting rack is fixed on a moving device, the other end of the wrench mounting rack is connected with a plurality of wrench connecting plates, and one end, far away from the wrench mounting rack, of each wrench connecting plate is connected with a wrench assembly; the wrench assembly comprises a torque wrench, a wrench rotating head of the torque wrench is connected with a connecting shaft sleeve, a spline shaft is connected into the connecting shaft sleeve and slidably connected into the connecting shaft sleeve, and the lower end of the spline shaft is connected with a bolt sleeve. The wrench mounting frame is further provided with a plurality of lifting devices, the number of the lifting devices is the same as that of the wrench assemblies, the movable ends of the lifting devices are connected with lifting frames, the lifting frames are arranged on the outer sides of the wrench assemblies, and when the lifting frames ascend, the spline shafts can be driven to ascend. The torque wrench can be automatically driven to tighten a bolt, no worker participates in the whole process, and the working efficiency and the automation level can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of bolt tightening equipment, and in particular to a track bolt tightening device. Background Art

[0002] Since rail fasteners are in a complex working environment for a long time, they need to withstand periodic bending and torsion as well as the influence of harsh environments such as rain, snow, strong wind, high and low temperatures, and rail bolts are prone to loosening. If the loose bolts are not tightened in time, it will lead to a variety of fastener defects, including nut loss, spring clip loss, spring clip breakage, spring clip deviation, etc. These defects may cause relative displacement of the rails, leading to derailment accidents, and in serious cases, may cause casualties.

[0003] The existing fastening tools for track bolts are as follows:

[0004] Spike wrench: Spike wrench is a basic tool used for track maintenance. Its main function is to tighten the track bolts through manual operation. However, this traditional operation method has problems such as low efficiency, frequent repetitive operations and high labor intensity. More importantly, during the operation, track maintenance personnel mainly rely on personal experience to judge the tightness of the bolts, which can easily lead to over-tightening of the bolts or failure to meet the appropriate tightening standards, which in turn leads to safety hazards such as loosening or breaking of track fasteners, affecting the overall stability and operational safety of the track system.

[0005] Handheld bolt tightening equipment: There are many handheld tightening equipment on the market, such as the portable rail wrench AT18 internal combustion air cannon launched by Germany's Atson Company, the alloy hydraulic wrench AL-Ti of the American Kate Company, and the impact single-head wrench GT-3500GE of Japan's VESSEL Company. Although these devices are easy to operate, they still require manual alignment and pressing, which is highly repetitive and labor-intensive. In addition, each operation can only tighten a single bolt, resulting in low overall work efficiency.

[0006] Therefore, there is an urgent need in the art for a rail bolt tightening device to solve the above-mentioned problems. Summary of the invention

[0007] The purpose of the present invention is to provide a rail bolt tightening device to solve the problems existing in the above-mentioned prior art, which can control the torque wrench to automatically tighten the bolts without the participation of workers, thereby reducing labor intensity and improving work efficiency.

[0008] To achieve the above object, the present invention provides the following solutions:

[0009] The invention discloses a rail bolt tightening device, comprising a wrench mounting frame, one end of the wrench mounting frame is fixed on a moving device, the other end of the wrench mounting frame is connected to a plurality of wrench connecting plates, one end of the wrench connecting plate away from the wrench mounting frame is connected to a wrench assembly, the wrench assembly comprises a torque wrench, a wrench rotating head of the torque wrench is connected to a connecting sleeve, a spline shaft is connected inside the connecting sleeve, the spline shaft is slidably connected to the inside of the connecting sleeve, and a bolt sleeve is connected to the lower end of the spline shaft;

[0010] The wrench mounting frame is also equipped with a plurality of lifting devices, the number of which is the same as that of the wrench assemblies. The movable end of the lifting device is connected to a lifting frame, which is arranged on the outside of the wrench assembly. When the lifting frame rises, it can drive the spline shaft to rise.

[0011] Preferably, two of each of the wrench connecting plate, the wrench assembly and the lifting device are provided.

[0012] Preferably, the wrench connecting plate is a Z-shaped structure, and the wrench connecting plate is fixedly connected to the wrench mounting frame by screws.

[0013] Preferably, a spring is provided in the connecting sleeve, the upper end of the spring abuts against the top end of the connecting sleeve, and the lower end of the spring abuts against the upper end of the spline shaft.

[0014] Preferably, the wrench rotating head and the connecting sleeve are matched by splines; the wrench rotating head is provided with a rotating head pin hole penetrating therethrough, the upper end of the connecting sleeve is provided with a sleeve upper pin hole, and the rotating head pin hole and the sleeve upper pin hole are connected by a sleeve upper pin shaft;

[0015] An outer connecting spline is provided on the outer wall of the spline shaft, and an inner connecting spline is provided on the inner wall of the connecting sleeve, and the inner connecting spline matches the outer connecting spline;

[0016] A spline pin hole is provided at the lower end of the spline shaft, a sleeve pin hole is provided on the bolt sleeve, and the spline pin hole and the sleeve pin hole are connected via a spline pin shaft;

[0017] The rotating head pin hole and the pin hole on the sleeve are both clearance-matched with the pin shaft on the sleeve; the inner connecting spline and the outer connecting spline are clearance-matched; the spline pin hole and the sleeve pin hole are both clearance-matched with the spline pin shaft.

[0018] Preferably, the bolt sleeve is provided with a hexagonal hole, and one end of the hexagonal hole is chamfered.

[0019] Preferably, the lifting device is a linear module, which includes a servo motor, a coupling, a rotating screw, a slider and a protective shell. The output shaft of the servo motor is transmission-connected to one end of the rotating screw through the coupling, the slider is threadedly connected to the rotating screw, and the protective shell is located on the outside of the rotating screw.

[0020] Preferably, two photoelectric switches are provided on the protective housing, and a photoelectric baffle is provided on the slider, and the photoelectric baffle can block the optical axis on the photoelectric switch.

[0021] Preferably, the spline shaft is provided with a penetrating screw slot, a connecting screw is provided in the screw slot, a long hole is provided on both sides of the connecting sleeve, and both ends of the connecting screw pass through the two long holes respectively.

[0022] Preferably, a guide wheel is provided at each end of the connecting screw, a lifting base plate is provided at the bottom of the lifting frame, a lifting through hole is provided at the center of the lifting base plate, the spline shaft and the bolt sleeve can both pass through the lifting through hole, a guide groove is provided on the upper surface of the lifting base plate, and the two guide wheels are both arranged in the guide groove.

[0023] Compared with the prior art, the present invention has achieved the following technical effects:

[0024] The present invention can drive the spline shaft and the bolt sleeve connected thereto to move up and down through the lifting device, thereby driving the bolt sleeve to be inserted into or pulled out of the bolt to be tightened, and then use the torque wrench to drive the bolt sleeve to rotate, thereby realizing the tightening of the bolt. The whole process does not require manual operation by the staff, so the labor intensity of the staff can be effectively reduced, and the work efficiency and the degree of mechanical automation can also be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 This is a schematic structural diagram of a rail bolt tightening device according to an embodiment of the present invention;

[0027] Figure 2 It is a structural schematic diagram of a wrench assembly in a rail bolt tightening device according to an embodiment of the present invention;

[0028] Figure 3 It is a front cross-sectional view of a wrench assembly in a rail bolt tightening device according to an embodiment of the present invention;

[0029] Figure 4 Schematic diagram of the structure of the connecting sleeve in the rail bolt tightening device according to the embodiment of the present invention

[0030] Figure 5 It is a schematic structural diagram of a spline shaft in a rail bolt tightening device according to an embodiment of the present invention;

[0031] Figure 6 It is a schematic structural diagram of a bolt sleeve in a rail bolt tightening device according to an embodiment of the present invention;

[0032] Figure 7 It is a schematic structural diagram of a lifting base plate in a rail bolt tightening device according to an embodiment of the present invention;

[0033] Figure 8 A diagram showing the position relationship between a slider and a photoelectric switch in a rail bolt tightening device according to an embodiment of the present invention;

[0034] In the figure: 1-wrench mounting frame; 2-wrench connecting plate; 3-wrench assembly; 301-torque wrench; 302-wrench rotating head; 303-connecting sleeve; 3031-long hole; 304-spring; 305-spline shaft; 306-bolt sleeve; 3061-chamfer; 307-connecting screw; 4-lifting device; 401-slider; 402-photoelectric baffle; 403-photoelectric switch; 5-lifting frame; 501-lifting bottom plate; 5011-guide groove. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The purpose of the present invention is to provide a rail bolt tightening device to solve the problems existing in the above-mentioned prior art, which can control the torque wrench to automatically tighten the bolts without the participation of workers, thereby reducing labor intensity and improving work efficiency.

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] Embodiment 1

[0039] like Figure 1-Figure 8As shown, this embodiment provides a rail bolt tightening device, including a wrench mounting frame 1, one end of the wrench mounting frame 1 is fixed on a mobile device, and the mobile device includes but is not limited to the existing AGV rail robot, AGV trolley or other electric trolley, and its purpose is to drive the wrench mounting frame 1 and other structures connected thereto to move synchronously from one work site to the next work site. The other end of the wrench mounting frame 1 is connected to a plurality of wrench connecting plates 2, and the end of the wrench connecting plate 2 away from the wrench mounting frame 1 is connected to a wrench assembly 3. The number of wrench connecting plates 2 and wrench assemblies 3 can be designed according to actual needs. Generally speaking, the more the number is set, the higher the work efficiency is. Of course, the manufacturing cost and the use cost will also increase accordingly, so the specific number needs to be designed according to actual needs during design. The wrench assembly 3 includes a torque wrench 301, and the torque wrench 301 is preferably an existing electric torque wrench 301, and is electrically connected to an industrial control computer, and its operation is controlled by the industrial control computer. The wrench rotating head 302 of the torque wrench 301 is connected to a connecting sleeve 303, and a spline shaft 305 is connected inside the connecting sleeve 303. The spline shaft 305 is connected to the inside of the connecting sleeve 303 by sliding up and down. The lower end of the spline shaft 305 is connected to a bolt sleeve 306, which is used to cooperate with the bolt to be tightened.

[0040] The wrench mounting frame 1 is also equipped with a plurality of lifting devices 4, the number of which is the same as that of the wrench assembly 3 and they correspond one to one. The moving end of the lifting device 4 is connected to a lifting frame 5, and the moving end of the lifting device 4 can drive the lifting frame 5 to move up and down. The lifting frame 5 is arranged on the outside of the wrench assembly 3, and when the lifting frame 5 rises, it can drive the spline shaft 305 to rise.

[0041] In actual work, the mobile device first drives each wrench assembly 3 to move to the expected position, and then drives the lifting frame 5 to move downward through the lifting device 4, and the bolt sleeve 306 will also drop accordingly, so that the bolt sleeve 306 is inserted into the bolt to be tightened. If the position of the bolt to be tightened is higher than the position of the bolt sleeve 306, it is necessary to first use the lifting device 4 to drive the bolt sleeve 306 to move upward, and then control the bolt sleeve 306 to move downward. Then start the torque wrench 301, and the wrench rotating head 302 drives the spline shaft 305 and the bolt sleeve 306 to rotate through the connecting sleeve 303, thereby realizing the tightening of the bolt. After the bolt tightening work is completed, the mobile device controls the entire equipment to move to the next station to tighten the next bolt.

[0042] In this embodiment, if Figure 1 As shown, two wrench connecting plates 2, two wrench assemblies 3 and two lifting devices 4 are provided. The purpose of such arrangement is to tighten two bolts at one time, thereby effectively improving work efficiency.

[0043] In this embodiment, if Figure 2 As shown, the wrench connecting plate 2 is a Z-shaped structure, and the two ends of the wrench connecting plate 2 are fixedly connected to the wrench mounting frame 1 and the torque wrench 301 respectively by screws.

[0044] In this embodiment, if Figure 3 As shown, a spring 304 is provided in the connecting sleeve 303, the upper end of the spring 304 abuts against the top of the connecting sleeve 303, and the lower end of the spring 304 abuts against the upper end of the spline shaft 305. When the lifting device 4 drives the spline shaft 305 to move upward through the lifting frame 5, the spring 304 is in a compressed state; when the lifting frame 5 moves downward, the spring 304 will give the spline shaft 305 a downward elastic force, and combined with the deadweight of the spline shaft 305, it can drive the spline shaft 305 to move downward.

[0045] In this embodiment, if Figure 3 As shown, the wrench rotating head 302 and the connecting shaft sleeve 303 are matched by splines. It is easy to understand that the outer wall of the wrench rotating head 302 is provided with a special-shaped protrusion, and the upper inner wall of the connecting shaft sleeve 303 is provided with a corresponding special-shaped groove. The special-shaped protrusion cooperates with the special-shaped groove, so that the rotation of the wrench rotating head 302 drives the connecting shaft sleeve 303 to rotate. In addition, the wrench rotating head 302 is provided with a rotating head pin hole that penetrates, and the upper end of the connecting shaft sleeve 303 is provided with a sleeve upper pin hole (i.e. Figure 4 The small round hole on the right side of the middle), the pin hole of the rotating head and the pin hole on the shaft sleeve are connected through the pin shaft on the shaft sleeve, so as to further fix the two and enable the two to rotate synchronously.

[0046] An outer connecting spline is provided on the outer wall of the spline shaft 305, and an inner connecting spline is provided on the inner wall of the connecting sleeve 303. The inner connecting spline cooperates with the outer connecting spline to achieve the technical effect that the spline shaft 305 slides up and down in the connecting sleeve 303, and the connecting sleeve 303 can drive the spline shaft 305 to rotate synchronously.

[0047] The lower end of the spline shaft 305 is provided with a spline pin hole (i.e. Figure 5 The bolt sleeve 306 is provided with a sleeve pin hole ( Figure 6 The spline pin hole and the sleeve pin hole are connected by a spline pin shaft, thereby realizing the hinge connection between the spline shaft 305 and the bolt sleeve 306. When the spline shaft 305 rotates, the bolt sleeve 306 is driven to rotate.

[0048] It should be noted that the rotating head pin hole and the sleeve pin hole are both clearance matched with the sleeve pin shaft, so as to achieve displacement compensation between the wrench rotating head 302 and the connecting sleeve 303. The inner connecting spline and the outer connecting spline are clearance matched, so as to achieve displacement compensation between the connecting sleeve 303 and the spline shaft 305. Similarly, the spline pin hole and the sleeve pin hole are both clearance matched with the spline pin shaft, so as to achieve displacement compensation between the spline shaft 305 and the bolt sleeve 306. The purpose of such a setting is that when the bolt sleeve 306 is not located directly above the track bolt and tightening operation is performed, during the process of the bolt sleeve 306 descending, the bolt sleeve 306 can be tilted to contact one side of the track bolt. Since there is displacement compensation between the connecting sleeve 303 and the wrench rotating head 302, between the spline shaft 305 and the connecting sleeve 303, and between the spline shaft 305 and the bolt sleeve 306, under the downward pressure generated when the spring 304 is restored, the bolt sleeve 306 can adaptively adjust the angle according to the position of the track bolt so as to cover the track bolt and realize adaptive work.

[0049] In this embodiment, if Figure 6 As shown, the bolt sleeve 306 is provided with a hexagonal hole, and one end of the hexagonal hole (specifically the lower end, that is, Figure 6 The left end in the figure is provided with a chamfer 3061, the purpose of which is also to enhance the adaptability of the bolt sleeve 306 and the track bolt when the bolt sleeve 306 is descending and is not directly opposite to the track bolt (i.e., the bolt to be tightened).

[0050] In this embodiment, the lifting device 4 is a linear module, which is a prior art. Figure 1 To explain its structure, the linear module includes a servo motor, a coupling, a rotating screw, a slider 401 and a protective shell. The servo motor is located at the top of the linear module, and the output shaft of the servo motor is set downward, and the output shaft of the servo motor is connected to one end of the rotating screw through the coupling, so when the servo motor rotates, it will drive the rotating screw to rotate synchronously. The slider 401 is threadedly connected to the rotating screw, and the protective shell is located on the outside of the rotating screw. It should be noted that the protective shell can be a rectangular shell, but one side must be provided with an opening, the purpose of which is to give the slider 401 enough space to slide, and the slider 401 can contact the two opposite sides of the protective shell, thereby limiting the slider 401 to prevent the slider 401 from rotating with the rotation of the rotating screw, so that the slider 401 can only move back and forth in a straight line along the axis direction of the rotating screw under the rotation of the rotating screw.

[0051] In addition, the servo motor can also be electrically connected to the controller, and the controller controls the switch of the servo motor to further control the up and down positions of the slider 401 and the lifting frame 5. The controller can include but is not limited to an existing PLC controller or a single-chip microcomputer controller.

[0052] In this embodiment, if Figure 8 As shown, two photoelectric switches 403 are provided on the protective housing. The photoelectric switch 403 can adopt the existing slot-type photoelectric switch 403 (or U-shaped photoelectric switch 403), which is usually a standard U-shaped structure. Its transmitter and receiver are respectively located on both sides of the U-shaped slot and form an optical axis. When the detected object passes through the U-shaped slot and blocks the optical axis, the photoelectric switch 403 generates a detected switch signal.

[0053] In order to cooperate with the photoelectric switch 403, the slider 401 is provided with a photoelectric baffle 402. When the slider 401 moves to the position of the photoelectric switch 403, the photoelectric baffle 402 can block the optical axis of the photoelectric switch 403. The detection signal can be further transmitted to the controller, and then the controller controls the next action of the slider 401.

[0054] In this embodiment, the spline shaft 305 is provided with a screw through slot (i.e. Figure 5 The connecting screw 307 is arranged in the screw groove. In contrast, both sides of the connecting sleeve 303 are provided with a long hole 3031, and the two ends of the connecting screw 307 pass through the two long holes 3031 respectively. When the spline shaft 305 moves up and down, the connecting screw 307 can move up and down under the limiting effect of the long holes 3031, so that the spline shaft 305 can only slide up and down in the connecting sleeve 303, and the two cannot rotate relative to each other.

[0055] In this embodiment, a guide wheel (or a bearing) is provided at each end of the connecting screw 307. Figure 8 As shown, a lifting base plate 501 is provided at the bottom of the lifting frame 5, and a lifting through hole is provided at the center of the lifting base plate 501, through which the spline shaft 305 and the bolt sleeve 306 can pass when moving up and down. A circular guide groove 5011 is provided on the upper surface of the lifting base plate 501, and two guide wheels are arranged in the guide groove 5011. When the spline shaft 305 rotates, the guide wheels can rotate in the guide groove 5011. And when the lifting frame 5 moves upward, the guide groove 5011 can provide a supporting force for the guide wheels, thereby pushing the spline shaft 305 to move upward.

[0056] Embodiment 2

[0057] This embodiment provides a working method of a rail bolt tightening device, based on the rail bolt tightening device disclosed in the first embodiment, specifically including a bolt sleeve 306 lifting process, a tightening working process and an adaptive working process, each process is as follows:

[0058] The lifting process of the bolt sleeve 306: the controller controls the servo motor to rotate, and drives the slider 401 to move upward through the coupling and the rotating screw. The lifting base plate 501 lifts the spline shaft 305 upward through the guide wheel, and the bolt sleeve 306 at the lower end of the spline shaft 305 is lifted, and the spring 304 in the connecting sleeve 303 is compressed. During the downward movement of the slider 401, the spring 304 releases the pressure and restores the extension, pushing the spline shaft 305 out of the connecting sleeve 303, and the bolt sleeve 306 descends until the photoelectric baffle 402 triggers the photoelectric switch 403, and the photoelectric switch 403 transmits the corresponding electrical signal to the control, and then the controller controls the next action of the slider 401, and finally realizes the lifting and lowering of the bolt sleeve 306.

[0059] Tightening process: The industrial computer communicates with the torque wrench and controls the torque wrench to rotate at the rated torque and speed. The torque wrench transmits the torque to the connecting sleeve 303, and the connecting sleeve 303 transmits the torque to the spline shaft 305. The guide wheels fixed on both sides of the spline shaft 305 rotate with the spline shaft 305 and roll on the guide groove 5011 of the lifting base plate 501. The guide groove 5011 bears the axial force generated by the guide wheel during operation. The spline shaft 305 finally transmits the torque to the bolt sleeve 306, realizing the tightening action of the bolt sleeve 306 on the track bolt.

[0060] Adaptive working process: When the device is tightening, the industrial computer controls the torque wrench to rotate, and the controller controls the bolt sleeve 306 to be lowered. The inner contours of the nut of the track bolt and the bolt sleeve 306 are both regular hexagons. When the bolt sleeve 306 is lowered, if the angles of the nut of the track bolt and the bolt sleeve 306 are not aligned, the bolt sleeve 306 will always be located above the track bolt and cannot continue to descend and cover the track bolt. The lifting base plate 501 moves downward with the slider 401, disengaging from the guide wheels on both sides of the spline shaft 305, and the compression constraint force of the spring 304 inside the connecting sleeve 303 is transferred from the lifting base plate 501 to the bolt sleeve 306. When the torque wrench 301 drives the bolt sleeve 306 to rotate to align with the angle of the nut of the track bolt, the bolt sleeve 306 will cover the track bolt below under the action of the instantaneous recovery and release of the pressure of the spring 304 inside the connecting sleeve 303. When the bolt sleeve 306 is still not located directly above the track bolt (when there is a slight angular deviation) and the tightening operation is being performed, since the bolt sleeve 306 has a hexagonal hole and a chamfer 3061, during the process of the bolt sleeve 306 descending, the bolt sleeve 306 can be tilted to contact one side of the track bolt, and further since there is displacement compensation between the connecting sleeve 303 and the wrench rotating head 302, between the spline shaft 305 and the connecting sleeve 303, and between the spline shaft 305 and the bolt sleeve 306, under the downward pressure generated when the spring 304 is restored, the bolt sleeve 306 can adaptively adjust the angle according to the position of the track bolt so as to cover the track bolt, thereby realizing adaptive work.

[0061] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A rail bolt tightening device, characterized in that: It comprises a wrench mounting frame, one end of the wrench mounting frame is fixed on the mobile device, the other end of the wrench mounting frame is connected to a plurality of wrench connecting plates, one end of the wrench connecting plate away from the wrench mounting frame is connected to a wrench assembly, the wrench assembly comprises a torque wrench, the wrench rotating head of the torque wrench is connected to a connecting sleeve, a spline shaft is connected inside the connecting sleeve, the spline shaft is slidably connected to the inside of the connecting sleeve, and a bolt sleeve is connected to the lower end of the spline shaft; The wrench mounting frame is also equipped with a plurality of lifting devices, the number of which is the same as that of the wrench assemblies. The movable end of the lifting device is connected to a lifting frame, which is arranged on the outside of the wrench assembly. When the lifting frame rises, it can drive the spline shaft to rise.

2. The rail bolt tightening device according to claim 1, characterized in that: The wrench connecting plate, the wrench assembly and the lifting device are each provided with two.

3. The track bolt tightening device according to claim 1, characterized in that: The wrench connecting plate is a Z-shaped structure, and the wrench connecting plate is fixedly connected to the wrench mounting frame by screws.

4. The rail bolt tightening device according to claim 1, characterized in that: A spring is arranged inside the connecting sleeve, the upper end of the spring abuts against the top end inside the connecting sleeve, and the lower end of the spring abuts against the upper end of the spline shaft.

5. The track bolt tightening device according to claim 1, characterized in that: The wrench rotating head and the connecting sleeve are matched by splines; the wrench rotating head is provided with a rotating head pin hole penetrating therethrough, the upper end of the connecting sleeve is provided with a sleeve upper pin hole, and the rotating head pin hole and the sleeve upper pin hole are connected by a sleeve upper pin shaft; An outer connecting spline is provided on the outer wall of the spline shaft, and an inner connecting spline is provided on the inner wall of the connecting sleeve, and the inner connecting spline matches the outer connecting spline; A spline pin hole is provided at the lower end of the spline shaft, a sleeve pin hole is provided on the bolt sleeve, and the spline pin hole and the sleeve pin hole are connected via a spline pin shaft; The rotating head pin hole and the pin hole on the sleeve are both clearance-matched with the pin shaft on the sleeve; the inner connecting spline and the outer connecting spline are clearance-matched; the spline pin hole and the sleeve pin hole are both clearance-matched with the spline pin shaft.

6. The track bolt tightening device according to claim 1, characterized in that: The bolt sleeve is provided with a hexagonal hole, and one end of the hexagonal hole is chamfered.

7. The track bolt tightening device according to claim 1, characterized in that: The lifting device is a linear module, which includes a servo motor, a coupling, a rotating screw, a slider and a protective shell. The output shaft of the servo motor is transmission-connected to one end of the rotating screw through the coupling, the slider is threadedly connected to the rotating screw, and the protective shell is located on the outside of the rotating screw.

8. The track bolt tightening device according to claim 7, characterized in that: The protective housing is provided with two photoelectric switches, and the slider is provided with a photoelectric baffle, which can block the optical axis on the photoelectric switch.

9. The rail bolt tightening device according to claim 1, characterized in that: The spline shaft is provided with a screw through slot, a connecting screw is arranged in the screw through slot, a long hole is arranged on both sides of the connecting sleeve, and two ends of the connecting screw pass through the two long holes respectively.

10. The track bolt tightening device according to claim 9, characterized in that: A guide wheel is provided at each end of the connecting screw, a lifting base plate is provided at the bottom of the lifting frame, a lifting through hole is provided at the center of the lifting base plate, the spline shaft and the bolt sleeve can both pass through the lifting through hole, a guide groove is provided on the upper surface of the lifting base plate, and the two guide wheels are both arranged in the guide groove.

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