Tunnel lining trolley capable of laying rails automatically

Abstract

The invention relates to the technical field of tunnel lining trolleys, in particular to an automatic track laying tunnel lining trolley which comprises a walking frame and two tracks symmetrically arranged at the bottom of the walking frame, each track comprises a track beam and a steel rail, the steel rails are fixedly installed at the tops of the track beams, and supports are fixedly installed at the two ends of the bottom of the walking frame. Two supporting legs are symmetrically and fixedly installed at the two ends of the two supports, first air cylinders are fixedly installed at the two ends of the interiors of the two supports, walking mechanisms are arranged at the bottoms of the multiple first air cylinders, and limiting mechanisms are arranged in the multiple supporting legs. The automatic track laying system has the beneficial effects that the problem of failure of the automatic track laying system caused by slipping between the pulleys and the track under the conditions that the interior of a tunnel is relatively humid and the surface of the track is polluted by oil stains is solved, so that the automatic track laying system can normally operate under special conditions to lay the track.

Description

Technical Field

[0001] The invention relates to the technical field of tunnel lining trolleys, in particular to a tunnel lining trolley capable of automatically laying tracks. Background Art

[0002] Tunnel lining trolleys are specialized equipment used for secondary lining operations during tunnel construction. Existing tunnel lining trolleys primarily consist of a gantry, bracket, arched formwork, support mechanism, and travel mechanism. The travel mechanism can be configured in either manual or automatic track-laying modes.

[0003] The automatic track laying system in the tunnel lining trolley can move the track on the previous workstation of the tunnel lining trolley to the next workstation of the tunnel lining trolley before the tunnel lining trolley moves, thereby achieving the effect of automatic track laying. The automatic track laying system in the prior art lifts the track, uses multiple pulleys to contact the track, and then drives the multiple pulleys to rotate. The track is moved by the friction between the multiple pulleys and the track. However, when the interior of the tunnel is relatively humid, the friction between the pulleys and the track decreases due to the water film lubrication effect. At the same time, when the track surface is contaminated with oil (such as leakage of some hydraulic systems in the tunnel lining trolley), the oil molecules on the track surface form a super-slip interface, and slippage will occur between the pulleys and the track. The automatic track laying system then fails and cannot lay the track to the next workstation. Summary of the Invention

[0004] The object of the present invention is to provide a tunnel lining trolley capable of automatically laying tracks, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a tunnel lining trolley capable of automatically laying tracks, comprising a traveling frame and two tracks symmetrically arranged at the bottom of the traveling frame, the tracks comprising a track beam and steel rails, the steel rails being fixedly mounted on the top of the track beam, brackets being fixedly mounted at both ends of the bottom of the traveling frame, two supporting legs being symmetrically fixedly mounted at both ends of the two brackets, cylinder 1 being fixedly mounted at both ends of the two brackets, a traveling mechanism being arranged at the bottom of the plurality of cylinders 1, a limiting mechanism being arranged inside the plurality of supporting legs, a driving mechanism 1 and a driving mechanism 2 being arranged in the two brackets, and a clamping mechanism being arranged on the two driving mechanisms 2.

[0006] Preferably, the walking mechanism includes a frame, two walking wheels and a walking drive device. The top of the frame is fixedly connected to the telescopic shaft end of cylinder 1. The two walking wheels are symmetrically installed at both ends inside the frame. The walking drive device is connected to the two walking wheels, and the bottoms of the two walking wheels are in contact with the rails.

[0007] Preferably, the limiting mechanism includes a mounting seat and an adjusting component, and a limiting pulley group 1 is provided at the top and bottom ends of the mounting seat close to the walking mechanism side, and the two limiting pulley groups 1 are both slidably sleeved inside the end of the mounting seat close to a plurality of evenly distributed guide rods 1, and the plurality of guide rods 1 are fixedly connected to the mounting seat, and a limiting pulley group 2 is fixedly installed in the middle of the mounting seat close to the two limiting pulley groups 1.

[0008] Preferably, the adjustment assembly includes two extension plates and four adjustment rods, the two extension plates are symmetrically fixedly installed on the bottom of the support leg close to the walking mechanism, the top and bottom of the two extension plates are each provided with a strip groove, the four strip grooves are connected to an inclined groove on the side close to the walking mechanism, the four adjustment rods are respectively fixedly installed on both sides of the two limiting pulley groups, the four adjustment rods are respectively arranged at the end of the two limiting pulley groups away from the walking mechanism, and the four adjustment rods are respectively slidably arranged in the interior of their respective corresponding strip grooves and inclined grooves.

[0009] Preferably, the driving mechanism 1 includes a cylinder 2, the bottom of the cylinder 2 is fixedly connected to the supporting leg, the telescopic shaft end of the cylinder 2 is fixedly installed with a lifting frame 1, and multiple connecting rods are fixedly installed at both ends of the bottom of the lifting frame 1. The multiple connecting rods are divided into two groups and symmetrically arranged at one end of the lifting frame 1. Transmission rods are slidably installed inside the bottom ends of the multiple connecting rods, and the multiple transmission rods are respectively fixedly installed inside the corresponding mounting seats.

[0010] Preferably, the clamping mechanism includes an adjusting seat, two lifting frames and a transmission assembly, each of the two ends of the adjusting seat is provided with a strip groove, and the two sides of the two strip grooves away from each other are connected to the inclined groove, and the inside of the two inclined grooves is movably installed with an adjusting rod, and the outside of the two adjusting rods is fixedly sleeved with a supporting pulley group, and the tops of the two supporting pulley groups are respectively fitted with the bottoms of the two lifting frames, and clamping plates are slidably installed at both ends of the bottom of the adjusting seat, and a spring is fixedly installed between the sides of the two clamping plates close to each other and the adjusting seat, and multiple sliding rods are fixedly installed at both ends of the bottom of the two lifting frames, and multiple mounting seats are slidably connected to their corresponding sliding rods.

[0011] Preferably, the transmission assembly includes a motor 1, a bidirectional screw and a guide rod 2. The motor 1 is fixedly installed on one side of the adjustment seat, the bidirectional screw is rotatably connected to the adjustment seat, the guide rod 2 is fixedly connected to the adjustment seat, the output shaft end of the motor 1 is connected to the bidirectional screw, and both ends of the outside of the bidirectional screw are threadedly sleeved with a pushing frame, and both ends of the two pushing frames are provided with a strip groove 3. The two ends of the two adjusting rods 2 are respectively slidably arranged in the interior of their respective corresponding strip grooves 3, and the bottom ends of the two pushing frames respectively cooperate with the top ends of the two clamping plates.

[0012] Preferably, the second driving mechanism includes a second motor and a threaded rod, the threaded rod is rotatably installed inside the bracket, the second motor is fixedly installed at one end inside the bracket, the output shaft end of the second motor is fixedly connected to the threaded rod, and the adjustment seat is threadedly sleeved on the outside of the threaded rod.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. This device uses two clamping mechanisms to clamp the two rails before laying the two rails at the next workstation, replacing the existing method of laying the rails at the next workstation solely through the friction generated by the pulleys and rails. This solves the problem of the automatic rail laying system failing due to slippage between the pulleys and rails when the tunnel is relatively humid or the rail surface is contaminated by oil. This allows the automatic rail laying system to operate normally and lay rails even under special circumstances.

[0015] 2. By using multiple limiting mechanisms to limit the two rails, they also play a supporting role on the two rails, avoiding the deviation of the two rails during the forward laying process, making the two rails move forward stably, thereby ensuring the correspondence between the subsequent walking mechanism and the rails. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 A schematic diagram of a support structure of the present invention;

[0018] Figure 3 This is a schematic structural diagram of one side of the bracket of the present invention;

[0019] Figure 4 This is a schematic diagram of the supporting local internal structure of the present invention;

[0020] Figure 5 It is a schematic diagram of the walking mechanism of the present invention;

[0021] Figure 6 It is a schematic structural diagram of the adjustment seat of the present invention;

[0022] Figure 7 This is a schematic structural diagram of the lifting frame 1 and the lifting frame 2 of the present invention;

[0023] Figure 8 This is a schematic structural diagram of one side of the mounting base of the present invention;

[0024] Figure 9 This is a schematic structural diagram of the other side of the mounting base of the present invention;

[0025] Figure 10 This is a schematic diagram of the support leg structure of the present invention;

[0026] Figure 11 For the present invention Figure 10 A partial enlarged view in .

[0027] In the accompanying drawings, the components represented by the reference numerals are as follows: 1. Traveling frame; 2. Track beam; 3. Rail; 4. Bracket; 5. Support leg; 6. Cylinder 1; 7. Frame; 8. Travel wheel; 9. Travel drive device; 10. Mounting seat; 11. Limiting pulley assembly 1; 12. Guide rod 1; 13. Extension plate; 14. Adjusting rod 1; 15. Strip groove 1; 16. Inclined groove 1; 17. Cylinder 2; 18. Lifting frame 1; 19. Connecting rod; 20. Transmission rod; 21. Adjusting seat; 22. Lifting frame 2; 23. Strip groove 2; 24. Inclined groove 2; 25. Adjusting rod 2; 26. Support pulley group; 27. Clamping plate; 28. Spring; 29. ​​Motor 1; 30. Bidirectional screw rod; 31. Guide rod 2; 32. Pushing frame; 33. Strip groove 3; 34. Motor 2; 35. Threaded rod; 36. Limiting pulley group 2; 37. Sliding rod. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts are within the scope of protection of the present invention.

[0029] The present invention provides a technical solution: Figures 1-11The tunnel lining trolley capable of automatic track laying shown includes a traveling frame 1 and two tracks symmetrically arranged at the bottom of the traveling frame 1, the tracks including a track beam 2 and a steel rail 3, the steel rail 3 is fixedly installed on the top of the track beam 2, and brackets 4 are fixedly installed at both ends of the bottom of the traveling frame 1, and two supporting legs 5 are symmetrically fixedly installed at both ends of the two brackets 4, and cylinders 6 are fixedly installed at both ends of the two brackets 4, and the bottoms of multiple cylinders 6 are provided with traveling mechanisms, and the interiors of multiple supporting legs 5 are provided with limiting mechanisms, and the two brackets 4 are provided with a driving mechanism 1 and a driving mechanism 2, and the two driving mechanisms 2 are provided with a clamping mechanism.

[0030] The walking mechanism includes a frame 7, two walking wheels 8 and a walking drive device 9. The top of the frame 7 is fixedly connected to the telescopic shaft end of the cylinder 6. The two walking wheels 8 are symmetrically installed at both ends of the frame 7. The walking drive device 9 is connected to the two walking wheels 8, and the bottoms of the two walking wheels 8 are in contact with the rail 3.

[0031] The limiting mechanism includes a mounting seat 10 and an adjustment component. A limiting pulley group 11 is provided at the top and bottom ends of the mounting seat 10 near the walking mechanism. The two limiting pulley groups 11 are both slidably sleeved inside the ends of the mounting seat 10 near one end. The multiple guide rods 12 are all fixedly connected to the mounting seat 10. A limiting pulley group 2 36 is fixedly installed in the middle of the mounting seat 10 near the two limiting pulley groups 11.

[0032] The adjustment assembly includes two extension plates 13 and four adjustment rods 14. The two extension plates 13 are symmetrically fixedly installed on the bottom of the support leg 5 near the walking mechanism. The top and bottom of the two extension plates 13 are each provided with a strip groove 15. The four strip grooves 15 are connected to an inclined groove 16 on the side near the walking mechanism. The four adjustment rods 14 are respectively fixedly installed on both sides of the two limiting pulley groups 11. The four adjustment rods 14 are respectively arranged at the end of the two limiting pulley groups 11 away from the walking mechanism. The four adjustment rods 14 are respectively slidably arranged inside the corresponding strip groove 15 and the inclined groove 16.

[0033] The driving mechanism 1 includes a cylinder 2 17, the bottom of the cylinder 2 17 is fixedly connected to the support leg 5, and the telescopic shaft end of the cylinder 2 17 is fixedly installed with a lifting frame 18. Both ends of the bottom of the lifting frame 18 are fixedly installed with multiple connecting rods 19. The multiple connecting rods 19 are divided into two groups and symmetrically arranged at one end of the lifting frame 18. The bottom ends of the multiple connecting rods 19 are all slidably installed with transmission rods 20. The multiple transmission rods 20 are respectively fixedly installed in the interior of their corresponding mounting seats 10.

[0034] The clamping mechanism includes an adjusting seat 21, two lifting frames 22 and a transmission assembly. Both ends of the adjusting seat 21 are provided with a strip groove 23. The two strip grooves 23 are connected to an inclined groove 24 on the side away from each other. Adjusting rods 25 are movably installed inside the two inclined grooves 24. The outsides of the two adjusting rods 25 are fixedly sleeved with supporting pulley groups 26. The tops of the two supporting pulley groups 26 are respectively fitted with the bottoms of the two lifting frames 22. Clamping plates 27 are slidably installed on both ends of the bottom of the adjusting seat 21. A spring 28 is fixedly installed between the side where the two clamping plates 27 are close to each other and the adjusting seat 21. Multiple sliding rods 37 are fixedly installed on both ends of the bottom of the two lifting frames 22. Multiple mounting seats 10 are slidably connected to their corresponding sliding rods 37.

[0035] The transmission assembly includes a motor 29, a bidirectional screw rod 30 and a guide rod 2 31. The motor 1 29 is fixedly installed on one side of the adjustment seat 21. The bidirectional screw rod 30 is rotatably connected to the adjustment seat 21. The guide rod 2 31 is fixedly connected to the adjustment seat 21. The output shaft end of the motor 1 29 is connected to the bidirectional screw rod 30. Both ends of the outside of the bidirectional screw rod 30 are threadedly sleeved with a pushing frame 32. Both ends of the two pushing frames 32 are provided with a strip groove 33. The two ends of the two adjusting rods 25 are respectively slidably arranged in the interior of their respective corresponding strip grooves 33. The bottom ends of the two pushing frames 32 respectively cooperate with the top ends of the two clamping plates 27.

[0036] Driving mechanism 2 includes motor 2 34 and threaded rod 35. The threaded rod 35 is rotatably installed inside the bracket 4. Motor 2 34 is fixedly installed at one end inside the bracket 4. The output shaft end of motor 2 34 is fixedly connected to the threaded rod 35. The adjustment seat 21 is threadedly sleeved on the outside of the threaded rod 35.

[0037] Working principle: When in use, multiple travel drive devices 9 drive the corresponding travel wheels 8 to rotate, and the multiple travel wheels 8 slide on the top of the corresponding rails 3, thereby driving the travel frame 1 to move. When the track is laid at the next workstation, the multiple cylinders 1-6 are first activated to contract, and the multiple travel mechanisms move upward, and the travel frame 1, two brackets 4 and multiple support legs 5 descend. The bottoms of the multiple support legs 5 contact the ground to support the whole. At this time, the multiple limit mechanisms correspond to the corresponding track beams 2 respectively;

[0038] Subsequently, the two driving mechanisms 1 are started, and the two driving mechanisms 1 act on their respective corresponding limiting mechanisms, and the limiting mechanisms are used to pre-limit the two track beams 2. The movement process of one driving mechanism and one limiting mechanism is as follows: the cylinder 2 17 is started to push the lifting frame 18 to move downward, and the lifting frame 18 drives the multiple connecting rods 19 at its bottom to move downward, and the multiple connecting rods 19 slide along their respective corresponding transmission rods 20. The two transmission rods 20 in one limiting mechanism are subjected to force, thereby pushing the mounting seat 10 to move toward the outside of the track beam 2, and the mounting seat 10 drives the two limiting pulley groups 11 and the limiting pulley group 2 36 to approach the track beam 2 synchronously, and the two limiting pulley groups 11 drive their respective corresponding adjusting rods 14 to first move in the opposite direction. When the plurality of adjusting rods 14 enter the corresponding inclined grooves 16, the two limiting pulley sets 11 move away from each other and slide along the corresponding guide rods 12. When the limiting pulley set 2 36 is in contact with the side surface of the track beam 2, the two limiting pulley sets 11 are respectively in contact with the top and bottom of the inner wall of the track beam 2; the movement process of the remaining plurality of limiting mechanisms is the same as the above-mentioned. The plurality of limiting mechanisms limit the two rails and also play the role of supporting the two rails, thereby preventing the two rails from deviating during the forward laying process, allowing the two rails to move forward stably, thereby ensuring the correspondence between the subsequent walking mechanism and the rails;

[0039] After the two rails are limited, the two rails are clamped by the two clamping mechanisms respectively. The movement process of one clamping mechanism is as follows: start the motor 1 29 to make the bidirectional screw rod 30 rotate. Under the action of the guide rod 2 31, the two pushing frames 32 move inward at the same time. The two adjusting rods 25 move close to each other under the action of the two pushing frames 32. The two ends of the two adjusting rods 25 slide in the corresponding strip grooves 33 respectively. The two adjusting rods 25 first move in the corresponding inclined grooves 24. At this time, the two adjusting rods 25 respectively drive the two supporting pulley groups 26 to move upward. The two supporting pulley groups 26 push the two lifting frames 22 upward. The two lifting frames 22 drive the corresponding limiting mechanisms and the driving mechanism 1 to move upward as a whole, so that the corresponding rails can be lifted so that the bottom of the rails do not contact the ground. When the rails are lifted to the position corresponding to the bottom of the two clamping plates 27, the two adjusting rods 2 5, they slide into the interior of their respective corresponding strip grooves 23, and the two supporting pulley sets 26 no longer move upward, but move horizontally. As the two pushing frames 32 continue to move, the bottom ends of the two pushing frames 32 act on the tops of the two clamping plates 27 respectively, and the two clamping plates 27 move closer to each other. The corresponding springs 28 in the two clamping plates 27 are compressed, and the bottoms of the two clamping plates 27 clamp the track beam 2; the movement process of the other clamping mechanism is the same as described above. This device uses two clamping mechanisms to clamp the two rails, and then lays the two rails at the next station, replacing the existing technology of laying the rails at the next station only by the friction generated by the pulleys and the rails. This solves the problem of failure of the automatic track laying system caused by slippage between the pulleys and the rails when the tunnel is relatively humid and the track surface is contaminated with oil. This enables the automatic track laying system to operate normally under special circumstances and lay the rails;

[0040] Finally, the two motors 34 are started to respectively drive the two threaded rods 35 to rotate, and the two clamping mechanisms move synchronously, thereby driving the two rails to move, and the two rails are laid at the next work station.

[0041] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0042] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A tunnel lining trolley capable of automatically laying tracks, comprising a traveling frame (1) and two tracks symmetrically arranged at the bottom of the traveling frame (1), characterized in that: The track comprises a track beam (2) and a steel rail (3), wherein the steel rail (3) is fixedly mounted on the top of the track beam (2), brackets (4) are fixedly mounted at both ends of the bottom of the walking frame (1), two supporting legs (5) are symmetrically fixedly mounted at both ends of the two brackets (4), a cylinder (6) is fixedly mounted at both ends of the inside of the two brackets (4), a walking mechanism is provided at the bottom of the plurality of cylinders (6), a limiting mechanism is provided inside the plurality of supporting legs (5), a driving mechanism (1) and a driving mechanism (2) are provided in the two brackets (4), and a clamping mechanism is provided on the two driving mechanisms (2).

2. The automatic track-laying tunnel lining trolley according to claim 1, characterized in that: The walking mechanism comprises a frame (7), two walking wheels (8) and a walking drive device (9); the top of the frame (7) is fixedly connected to the telescopic shaft end of the cylinder (6); the two walking wheels (8) are symmetrically mounted at the two ends of the frame (7); the walking drive device (9) is connected to the two walking wheels (8); and the bottoms of the two walking wheels (8) are in contact with the rail (3).

3. The automatic track-laying tunnel lining trolley according to claim 1, characterized in that: The limiting mechanism includes a mounting seat (10) and an adjusting component. A limiting pulley group (11) is provided at the top and bottom ends of the mounting seat (10) near the walking mechanism. A plurality of uniformly distributed guide rods (12) are slidably sleeved inside the two limiting pulley groups (11) near one end of the mounting seat (10). The plurality of guide rods (12) are fixedly connected to the mounting seat (10). A limiting pulley group (36) is fixedly installed in the middle of the mounting seat (10) near the two limiting pulley groups (11).

4. The automatic track-laying tunnel lining trolley according to claim 3, characterized in that: The adjustment assembly includes two extension plates (13) and four adjustment rods (14). The two extension plates (13) are symmetrically fixedly installed on the bottom of the support leg (5) near the walking mechanism. The top and bottom of the two extension plates (13) are each provided with a strip groove (15). The four strip grooves (15) are connected to an inclined groove (16) on the side close to the walking mechanism. The four adjustment rods (14) are respectively fixedly installed on both sides of the two limiting pulley groups (11). The four adjustment rods (14) are respectively arranged at the end of the two limiting pulley groups (11) away from the walking mechanism. The four adjustment rods (14) are respectively slidably arranged inside the corresponding strip groove (15) and the inclined groove (16).

5. The tunnel lining trolley capable of automatic track laying according to claim 4, characterized in that: The driving mechanism 1 includes a cylinder 2 (17), the bottom of the cylinder 2 (17) is fixedly connected to the supporting leg (5), the telescopic shaft end of the cylinder 2 (17) is fixedly installed with a lifting frame 1 (18), and multiple connecting rods (19) are fixedly installed at both ends of the bottom of the lifting frame 1 (18), and the multiple connecting rods (19) are divided into two groups and symmetrically arranged at one end of the lifting frame 1 (18). The bottom ends of the multiple connecting rods (19) are all slidably installed with transmission rods (20), and the multiple transmission rods (20) are respectively fixedly installed in the interior of their corresponding mounting seats (10).

6. The tunnel lining trolley capable of automatic track laying according to claim 3, characterized in that: The clamping mechanism comprises an adjusting seat (21), two lifting frames (22) and a transmission assembly, wherein both ends of the adjusting seat (21) are provided with a strip groove (23), and the two strip grooves (23) are connected to an inclined groove (24) on the side away from each other, and an adjusting rod (25) is movably installed inside the two inclined grooves (24), and the outsides of the two adjusting rods (25) are fixedly sleeved with a supporting pulley group (26), and the tops of the two supporting pulley groups (26) are respectively fitted with the bottoms of the two lifting frames (22), and the two ends of the bottom of the adjusting seat (21) are slidably installed with a clamping plate (27), and a spring (28) is fixedly installed between the side of the two clamping plates (27) close to each other and the adjusting seat (21), and the two ends of the bottom of the two lifting frames (22) are fixedly installed with a plurality of sliding rods (37), and the plurality of mounting seats (10) are respectively slidably connected with the corresponding sliding rods (37).

7. The tunnel lining trolley capable of automatic track laying according to claim 6, characterized in that: The transmission assembly includes a motor (29), a bidirectional screw rod (30) and a guide rod (31), wherein the motor (29) is fixedly mounted on one side of the adjustment seat (21), the bidirectional screw rod (30) is rotatably connected to the adjustment seat (21), the guide rod (31) is fixedly connected to the adjustment seat (21), the output shaft end of the motor (29) is connected to the bidirectional screw rod (30), both ends of the outer side of the bidirectional screw rod (30) are threadedly sleeved with a push frame (32), both ends of the two push frames (32) are provided with a strip groove (33), the two ends of the two adjustment rods (25) are respectively slidably arranged inside the corresponding strip groove (33), and the bottom ends of the two push frames (32) are respectively matched with the top ends of the two clamping plates (27).

8. The tunnel lining trolley capable of automatic track laying according to claim 6, characterized in that: The second driving mechanism comprises a second motor (34) and a threaded rod (35), wherein the threaded rod (35) is rotatably mounted inside the bracket (4), the second motor (34) is fixedly mounted at one end inside the bracket (4), the output shaft end of the second motor (34) is fixedly connected to the threaded rod (35), and the adjustment seat (21) is threadedly sleeved on the outside of the threaded rod (35).

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