Tamping machine lifting clamp anti-fall structure

Abstract

This utility model discloses a tamping machine track clamp anti-detachment structure, including a U-shaped track jacking frame, two main lifting hydraulic cylinders fixed between the top of the U-shaped track jacking frame and the middle of the bottom of the tamping machine, a fixed base fixed to the bottom of the U-shaped track jacking frame, and an auxiliary lifting hydraulic cylinder fixed to the bottom of the fixed base. This utility model, through a series of structures, facilitates single-drive synchronous four-point clamping and locking of the two tracks, effectively preventing track detachment during track lifting. It eliminates the need for multiple hydraulic cylinders for clamping, thus reducing the load on the hydraulic system. Furthermore, by incorporating a protective cover and a gear connection design where the rotating shaft extends into the cover, the gears are protected while ensuring the two clamp supports at the synchronous position rotate in opposite directions. This effectively reduces the risk of accidental stone splashing and jamming at the gear mesh, improving the stability and effectiveness of the anti-jamming application.

Description

Technical Field

[0001] This utility model relates to the field of road maintenance machinery technology, specifically to a tamping machine lifting clamp anti-fall-off structure. Background Technology

[0002] In the maintenance of railway tracks, tamping machines are typically used to automatically level, lift, and move the track, tamping the ballast and compacting the ballast on the ballast shoulders. This improves the density of the ballast and increases the stability of the track. The tamping machine is equipped with a track lifting and moving device in the middle of its frame, which acts on both the left and right rails to lift or move the rail panels left and right, i.e., track lifting and moving operations. During the track lifting operation, it is necessary to ensure that the lifting clamps hold the track stably, and it is especially important to prevent the track from falling off during the lifting process.

[0003] CN213925679U discloses a structure for preventing the detachment of a track clamp on a large track maintenance machine. The structure includes a lifting frame and a lifting clamp box. Lifting clamp boxes are located on both ends of the lifting frame. A first clamp support and a second clamp support are symmetrically connected inside the lifting clamp box. A clamping disc is connected to the lower end of both the first and second clamp supports. The structure extends by controlling the extension rod of the hydraulic cylinder of the clamp support, causing the first clamp support to flip downwards. Due to the meshing of the first and second gears welded at the upper junction of the first and second clamp supports, the second clamp support also flips downwards simultaneously until the clamping discs at the lower ends of the first and second clamp supports disengage from the upper sides of the track. This effectively prevents the clamping discs from detaching from the guide rail during track lifting.

[0004] The aforementioned technology discloses a large track maintenance machinery anti-detachment structure for track clamps. This structure utilizes eight gears, eight clamp supports, eight clamp discs, and four hydraulic cylinders for the clamp supports to drive two clamp discs at corresponding positions to clamp into the recessed area in the middle of the track. It leverages the fact that the diameter of the clamp discs is larger than the diameter of the clamp supports to create a clamping engagement, and uses the wider protruding portion at the top of the track to provide a blocking and limiting effect, thereby achieving an anti-detachment clamping effect and preventing separation during track lifting operations. However, this structure has the following shortcomings in practical applications:

[0005] 1. The clamping action of the four parts needs to be controlled by the hydraulic cylinders of the four clamp supports individually. This not only greatly increases the configuration load of the hydraulic system, but also makes it impossible to achieve four-point synchronous anti-disengagement clamping operation through a single drive.

[0006] 2. The gears are open in all directions (to allow for the rotation space of the clamp support). This structure makes it easy for stones splashed up during operation to get accidentally stuck in the meshing of the gear teeth, which can lead to jamming and poor stability.

[0007] In view of this, this application proposes a tamping machine lifting clamp anti-fall-off structure to solve the above problems. Utility Model Content

[0008] The purpose of this utility model is to provide a structure to prevent the tamping machine's track clamps from falling off, so as to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, this utility model provides the following technical solution: a tamping machine lifting clamp anti-fall-off structure, comprising a loop-shaped lifting frame, two main lifting hydraulic cylinders fixed between the top of the loop-shaped lifting frame and the middle of the bottom of the tamping machine, a fixing seat fixed to the bottom of the loop-shaped lifting frame, and an auxiliary lifting hydraulic cylinder fixed to the bottom of the fixing seat, and further comprising:

[0010] The U-shaped seats consist of four sets, which are fixedly connected to the front and rear sides of the U-shaped starting frame, respectively.

[0011] A dual-shaft drive motor is fixedly mounted on the top of the fixed base and located inside the loop-shaped starting frame;

[0012] A bidirectional thread drive assembly is mounted on a circular starter frame and fixedly connected to the ends of the two output shafts of a dual-shaft drive motor.

[0013] The anti-jamming relative rotation support assembly consists of four sets, each installed within a corresponding U-shaped seat. Two clamp supports are fixedly connected to the bottom of each assembly. A clamping disc larger than its outer diameter is welded to the bottom of each clamp support. The four middle clamp supports are rotatably connected to the bottom of a bidirectional threaded drive assembly on their adjacent sides. The bidirectional threaded drive assembly drives the four middle clamp supports to rotate synchronously or repulsively. The anti-jamming relative rotation support assembly drives the corresponding outer clamp supports to rotate in the opposite direction when the four middle clamp supports rotate. The opposite rotation of two clamp supports within the same U-shaped seat drives the corresponding two clamping discs to rotate in the opposite direction. By using a clamping disc diameter larger than the outer diameter of the clamp support, the two clamping discs at the same location clamp together in the concave area in the middle of the track when rotating close together. The outward convexity of the upper part of the track blocks and restricts the corresponding clamping discs, achieving the effect of preventing slippage and clamping.

[0014] Preferably, the bidirectional threaded drive assembly includes a screw, a horizontal guide rod, a movable seat, a rectangular sliding sleeve, a rotating sleeve, and a connecting rod. Two screws are rotatably mounted on the inner walls of both sides of the spiral-shaped starting frame. The ends of the two screws that are close to each other are fixedly connected to the ends of the two output shafts of the dual-axis drive motor. The threads of the two screws have opposite directions. Two movable seats are threaded onto the corresponding screws and slidably connected between the top and bottom inner walls of the spiral-shaped starting frame. Two horizontal guide rods are fixedly connected between the inner walls of both sides of the spiral-shaped starting frame. The dual-axis drive motor and the two screws are both located between the two horizontal guide rods, and the movable seats are slidably mounted on the two horizontal guide rods.

[0015] The number of rectangular sliding sleeves is two, both of which are slidably sleeved on the outside of the U-shaped starting frame. The movable seat is fixedly connected between the inner walls of the front and rear sides of the corresponding rectangular sliding sleeve. The number of rotating sleeves is four, with the front and rear sides of the rectangular sliding sleeves rotatably installed with the corresponding rotating sleeves. The number of connecting rods is four, which are welded and fixed to the bottom of the corresponding rotating sleeves. The two connecting rods on the left and right are symmetrically arranged at an angle. The four clamp supports in the middle are rotatably connected to the bottom end of the corresponding connecting rods on the side closest to each other.

[0016] Preferably, the anti-jamming relative rotation support assembly includes a rotating shaft, gears, and a retaining cover. There are two rotating shafts in the same group of anti-jamming relative rotation support assemblies, which are rotatably fitted between the front inner wall and the rear inner wall of the corresponding U-shaped seat. The two retaining covers that are opposite each other are respectively fixedly installed on the opposing sides of the two corresponding U-shaped seats. The bottom end of the rotating shaft is welded to the top end of the corresponding clamp support, and one end of the rotating shaft extends into the corresponding U-shaped seat. There are two gears in the same group of anti-jamming relative rotation support assemblies, which are respectively welded and sleeved on the corresponding rotating shafts. The two gears in the same group of anti-jamming relative rotation support assemblies are both located in the corresponding retaining covers and mesh with each other.

[0017] Preferably, a battery is fixedly installed on the top of the spiral-shaped starting frame and electrically connected to the dual-shaft drive motor via wires.

[0018] Preferably, a U-shaped mounting base is welded and fixed to one side of each of the four clamp supports located in the middle. A stainless steel shaft is welded and fixed between the inner walls of the front and rear sides of the U-shaped mounting base. A round sleeve is welded and fixed to the bottom end of the connecting rod. A first bearing is fixedly sleeved inside the round sleeve. The inner ring of the first bearing is fixedly fitted to the outer side of the corresponding stainless steel shaft.

[0019] Preferably, threaded holes are provided on the adjacent sides of the two movable seats, and the threaded holes are threadedly connected to the corresponding screws.

[0020] Preferably, a support base is fixedly connected to the bottom of the extended end of the auxiliary lifting hydraulic cylinder.

[0021] Compared with the prior art, the beneficial effects of this utility model are:

[0022] 1. Through the combination of the set-in spiral lifting frame, U-shaped seat, clamp support, clamp plate, dual-axis drive motor, bidirectional thread drive assembly and anti-jamming relative rotation support assembly, it can synchronously clamp and fasten the two rails at four points with a single drive, which can effectively prevent the rails from falling off when lifting the track. The method of achieving four-point synchronous anti-jamming clamping with a single drive does not require the separate equipment of multiple hydraulic cylinders for clamping, thus reducing the configuration load of the hydraulic system;

[0023] 2. By setting up an anti-jamming relative rotation support component, equipped with a protective cover, and combined with the design of the rotating shaft extending into its interior and using gear connection, the two clamp supports at the synchronous position can rotate in opposite directions while sealing and protecting the gears. This effectively reduces the phenomenon of stones accidentally splashing and getting stuck in the gear meshing point, thus improving the anti-jamming stability application effect.

[0024] This utility model features a series of structures that facilitate single-drive synchronous four-point engagement of two track anti-detachment clamps, effectively preventing track detachment during track lifting. Utilizing a single-drive, four-point synchronous anti-detachment clamping method eliminates the need for multiple hydraulic cylinders for clamping, thus reducing the load on the hydraulic system. Furthermore, by incorporating a protective cover and a gear-connected design where the rotating shaft extends into the cover, the gears are protected while ensuring the two clamp supports at the synchronous position rotate in opposite directions. This effectively reduces the risk of accidental stone splashing and jamming at the gear mesh, improving the stability and effectiveness of the anti-jamming application. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the anti-detachment structure of the tamping machine lifting clamp proposed in this utility model.

[0026] Figure 2 This is a schematic diagram of the cut-off structure of the protective cover of the anti-detachment structure of the tamping machine track clamp proposed in this utility model.

[0027] Figure 3 for Figure 2 A further cross-sectional structural diagram.

[0028] In the diagram: 1. Recurved lifting frame; 101. Main lifting hydraulic cylinder; 102. Auxiliary lifting hydraulic cylinder; 2. U-shaped seat; 201. Rotating shaft; 202. Clamp support; 203. Clamp disc; 204. Protective cover; 205. Gear; 3. Rectangular sliding sleeve; 301. Rotating sleeve; 302. Connecting rod; 303. Screw; 304. Moving seat; 305. Horizontal guide rod; 4. Fixed seat; 401. Dual-shaft drive motor. Detailed Implementation

[0029] 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 protection scope of the present utility model.

[0030] like Figures 1 to 3 As shown, the anti-detachment structure for the tamping machine lifting clamp proposed in this embodiment includes a loop-shaped lifting frame 1, two main lifting hydraulic cylinders 101 fixed between the top of the loop-shaped lifting frame 1 and the middle of the bottom of the tamping machine, a fixed base 4 fixed to the bottom of the loop-shaped lifting frame 1, and a secondary lifting hydraulic cylinder 102 fixed to the bottom of the fixed base 4. The bottom of the extended end of the secondary lifting hydraulic cylinder 102 is fixedly connected to a support base, and also includes:

[0031] The U-shaped seat 2 consists of four sets, which are respectively fixedly connected to the front two sides and the rear two sides of the U-shaped starting frame 1;

[0032] A dual-axis drive motor 401 is fixedly installed on the top of the fixed base 4 and located inside the loop-shaped starting frame 1. The loop-shaped starting frame 1 has a rectangular through hole, and the dual-axis drive motor 401 is located inside the rectangular through hole. A battery is fixedly installed on the top of the loop-shaped starting frame 1 and electrically connected to the dual-axis drive motor 401 through a wire.

[0033] A bidirectional thread drive assembly is mounted on the circular starter frame 1 and is fixedly connected to the ends of the two output shafts of the dual-shaft drive motor 401.

[0034] The anti-jamming relative rotation support assembly consists of four sets, each installed within a corresponding U-shaped seat 2. Two clamp supports 202 are fixedly connected to the bottom of each assembly. A clamp disc 203 larger than its outer diameter is welded to the bottom end of each clamp support 202. The four middle clamp supports 202 are rotatably connected to the bottom end of a bidirectional threaded drive assembly on adjacent sides. The bidirectional threaded drive assembly drives the four middle clamp supports 202 to rotate synchronously or repulsively. The anti-jamming relative rotation support assembly is used to... When the clamp support 202 rotates, it drives the corresponding outer clamp support 202 to rotate in the opposite direction. The opposite rotation of the two clamp supports 202 within the same U-shaped seat 2 drives the opposite rotation of the two corresponding clamp discs 203. By using the method that the diameter of the clamp disc 203 is larger than the outer diameter of the clamp support 202, when the two clamp discs 203 at the same location rotate close to each other, they are clamped and engaged in the concave area in the middle of the track. The width of the upper part of the track is convex to block and restrict the corresponding clamp disc 203, thereby achieving the effect of preventing the clamp from coming off.

[0035] It should be noted that a wireless remote control switch is fixed on the front side of the dual-axis drive motor 401, and the two are electrically connected by wires. The wireless remote control switch is equipped with a matching external remote control. It should be understood that the technology of realizing motor remote control operation by integrating a wireless remote control switch is a mature and well-known existing technology in the field of motor remote control start and stop control. It has been widely used in motor remote control start and stop scenarios. Therefore, this application will not elaborate on its specific structure and working principle here.

[0036] Furthermore, such as Figure 1 , 2 As shown in Figure 3, the bidirectional threaded drive assembly includes a screw 303, a transverse guide rod 305, a movable seat 304, a rectangular sliding sleeve 3, a rotating sleeve 301, and a connecting rod 302. Two screws 303 are rotatably mounted on the inner walls of both sides of the spiral-shaped starting frame 1. The ends of the two screws 303 that are close to each other are fixedly connected to the ends of the two output shafts of the dual-shaft drive motor 401. The threads of the two screws 303 have opposite directions. Two movable seats 304 are threaded onto the corresponding screws 303. The movable seats 304 are slidably connected between the top and bottom inner walls of the spiral-shaped starting frame 1. Two transverse guide rods 305 are fixedly connected between the inner walls of both sides of the spiral-shaped starting frame 1. The shaft drive motor 401 and the two screws 303 are located between the two horizontal guide rods 305. The movable seat 304 is slidably mounted on the two horizontal guide rods 305. There are two rectangular sliding sleeves 3, which are slidably mounted on the outside of the loop-shaped starting frame 1. The movable seat 304 is fixedly connected between the inner walls of the front and rear sides of the corresponding rectangular sliding sleeves 3. There are four rotating sleeves 301. The front and rear sides of the rectangular sliding sleeves 3 are rotatably mounted with the corresponding rotating sleeves 301. There are four connecting rods 302, which are welded and fixed to the bottom of the corresponding rotating sleeves 301. The two connecting rods 302 on the left and right are symmetrically arranged. The four clamp supports 202 in the middle are rotatably connected to the bottom of the corresponding connecting rods 302 on the side closest to each other.

[0037] In this embodiment, U-shaped mounting seats are welded and fixed to the adjacent sides of the four clamp supports 202 located in the middle. Stainless steel shafts are welded and fixed between the front and rear inner walls of the U-shaped mounting seats. A circular sleeve is welded and fixed to the bottom end of the connecting rod 302. A first bearing is fixedly fitted inside the circular sleeve. The inner ring of the first bearing is fixedly fitted to the outer side of the corresponding stainless steel shaft. The first bearing, U-shaped mounting seats, and circular sleeves provide rotational support between the corresponding clamp supports 202 and connecting rods 302. Threaded holes are opened on the adjacent sides of the two movable seats 304. The threaded holes are threadedly connected to the corresponding screws 303. The threaded connection between the screws 303 and the threaded holes, combined with the opposite screw directions of the two screws 303, facilitates the movement of the two movable seats 304 towards each other or repulsively when the two screws 303 rotate.

[0038] In this embodiment, a second bearing is fixedly fitted inside the rotating sleeve 301, and a support shaft welded and fixed to the outer side of the corresponding rectangular sliding sleeve 3 is fixedly fitted inside the inner ring of the second bearing. The rotating sleeve 301 is rotated and installed using the support shaft and the second bearing. The right side of the movable seat 304 has two horizontal guide holes that are respectively slidably fitted to the outer side of the corresponding horizontal guide rod 305, which serve to guide the lateral sliding of the movable seat 304. A third bearing is fixedly connected to the inner walls of both sides of the rotary lifting frame 1. The inner ring of the third bearing is fixedly fitted to the outer side of the corresponding screw 303, which serves to rotate and install the screw 303.

[0039] In this embodiment, the screws 303, horizontal guide rods 305, movable seats 304, rectangular sliding sleeves 3, rotating sleeves 301, and connecting rods 302 work together. The dual-axis drive motor 401 drives the two screws 303 to rotate synchronously. By using the opposite screw threads of the two screws 303, when the two screws 303 rotate, they drive the two movable seats 304 to slide close together or move back against each other on the two horizontal guide rods 305. The two movable seats 304 drive the two rectangular sliding sleeves 3 to move close together or move back against each other. The two rectangular sliding sleeves 3 drive the four connecting rods 302 to rotate close together or rotate back against each other through the four rotating sleeves 301. When the four connecting rods 302 move close together, they pull and drive the four clamp supports 202 in the middle to rotate close together. When the four connecting rods 302 move back against each other, they squeeze and drive the four clamp supports 202 in the middle to rotate back against each other.

[0040] Furthermore, such as Figure 1 , 2 As shown in Figure 3, the anti-jamming relative rotation support assembly includes a rotating shaft 201, a gear 205, and a retaining cover 204. There are two rotating shafts 201 in the same group of anti-jamming relative rotation support assemblies, which are rotatably fitted between the front inner wall and the rear inner wall of the corresponding U-shaped seat 2. The two retaining covers 204, which are opposite to each other, are respectively fixedly installed on the opposing sides of the two corresponding U-shaped seats 2. The bottom end of the rotating shaft 201 is welded to the top end of the corresponding clamp support 202. One end of the rotating shaft 201 extends into the corresponding U-shaped seat 2. There are two gears 205 in the same group of anti-jamming relative rotation support assemblies, which are respectively welded and sleeved on the corresponding rotating shaft 201. The two gears 205 in the same group of anti-jamming relative rotation support assemblies are both located in the corresponding retaining covers 204 and mesh with each other.

[0041] In this embodiment, two circular holes are opened on the inner walls of the front and rear sides of the U-shaped seat 2. A fourth bearing is fixedly sleeved in the circular hole. The inner ring of the fourth bearing is fixedly sleeved with the outer side of the corresponding rotating shaft 201, so as to achieve the effect of rotating the rotating shaft 201.

[0042] In this embodiment, through the cooperation of the rotating shaft 201, gear 205, and guard cover 204, when the four middle clamp supports 202 rotate close together, the middle clamp support 202 drives the corresponding rotating shaft 201 to rotate, the middle rotating shaft 201 drives the corresponding gear 205 to rotate, and the middle gear 205 drives the outer gear 205 meshing with it to rotate in the opposite direction. The outer gear 205, through the corresponding rotating shaft 201, drives the outer clamp support 202 to rotate in the opposite direction to its corresponding middle clamp support 202. When the four middle clamp supports 202 rotate repulsively, the direction of movement is opposite to the above-mentioned direction, thus changing the direction of movement. The middle clamp support 202 drives the outer clamp support 202 to rotate in close proximity through the corresponding rotating shaft 201 and two gears 205. When the two clamp discs 203 at the same location rotate close to each other, the clamps engage with the concave area in the middle of the track. When they rotate in opposite directions, the clamps disengage. By using the clamps to engage with the concave area in the middle of the track to prevent disengagement, the phenomenon of separation can be effectively avoided when the tamping machine lifts the track. The protective cover 204 is used to enclose and protect the corresponding two gears 205, reducing the phenomenon of stones accidentally splashing and getting stuck in the meshing of the gears 205, thus achieving a stable anti-jamming effect.

[0043] It should be noted that the screw 303, connecting rod 302, support shaft, rotating shaft 201, moving seat 304, clamp support 202 and clamp disc 203 are all made of stainless steel. The screw 303 has a high wear-resistant load-bearing specification with a thread clearance of 0.2 to 0.35 mm on the outer side. It utilizes the advantages of stainless steel, such as high hardness, high wear resistance and good maintenance-free effect, to ensure long-term connection and drive support stability.

[0044] The usage method of this embodiment is as follows: When using the anti-fall-off structure of the tamping machine's lifting clamp, fix the two main lifting hydraulic cylinders 101 in the middle of the bottom of the tamping machine, start the dual-shaft drive motor 401 in the forward direction to drive the two screws 303 to rotate synchronously. Utilizing the opposite screw threads of the two screws 303, when the two screws 303 rotate, they drive the two moving seats 304 to slide close together on the two horizontal guide rods 305. The two moving seats 304 drive the two rectangular sliding sleeves 3 to move close together. The two rectangular sliding sleeves 3 drive the four connecting rods 302 to rotate close together through the four rotating sleeves 301. When the four connecting rods 302 move close together, they pull and drive the four clamp supports 202 in the middle to rotate close together. During rotation, the middle clamp support 202 drives the corresponding rotating shaft 201 to rotate, the middle rotating shaft 201 drives the corresponding gear 205 to rotate, and the middle gear 205 drives the outer gear 205 meshing with it to rotate in the opposite direction. The outer gear 205 drives the outer clamp support 202 to rotate in the opposite direction to its corresponding middle clamp support 202 through the corresponding rotating shaft 201. When the two clamp supports 202 in the same U-shaped seat 2 rotate in the opposite direction, they drive the two corresponding clamp discs 203 to rotate in the opposite direction, thereby increasing the distance between them to provide space to move down and avoid the width of the upper part of the track. Then, the two main lifting hydraulic cylinders 101 drive the return lifting frame 1 to move down, thereby moving the four U-shaped seats 2 down. This causes the four clamping discs 203 to move downwards. Once the downward movement is appropriate, the dual-axis drive motor 401 is started in the reverse direction. Similarly, the movement direction of the dual-axis drive motor 401 is completely opposite to that of the forward start mentioned above. At this time, the two rectangular sliding sleeves 3 change to repulsive return movement, and through the four rotating sleeves 301, drive the four connecting rods 302 to rotate repulsively. When the four connecting rods 302 move repulsively, they squeeze and drive the four clamping supports 202 in the middle to rotate repulsively. When the four clamping supports 202 in the middle rotate repulsively, the movement direction is opposite to that mentioned above. The middle clamping support 202 drives the outer clamping supports 202 to rotate in a similar direction through the corresponding rotating shaft 201 and two gears 205. The two clamping supports 202 at the same location rotate in the same direction. The two corresponding clamping discs 203 rotate in close proximity and clamp onto the concave area in the middle of the track. By using the method that the diameter of the clamping disc 203 is larger than the outer diameter of the clamping support 202, it can provide the conditions for the clamping disc 203 to clamp onto the concave area in the middle of the track. By using the four-point clamping method to prevent detachment at the concave area in the middle of the track, the effect of single-drive synchronous four-point clamping and locking of the two tracks is achieved. When the main lifting hydraulic cylinder 101 is used for lifting or the auxiliary lifting hydraulic cylinder 102 is used for assisted lifting, the phenomenon of track falling off can be effectively avoided. By using a single drive to achieve four-point synchronous anti-detachment clamping, there is no need to equip multiple hydraulic cylinder devices for clamping, thus reducing the configuration load of the hydraulic system.Furthermore, by equipping the gear with a protective cover 204 and combining it with the design where the rotating shaft 201 extends into it and is connected by a gear 205, the gear 205 can be sealed and protected, effectively reducing the possibility of stones accidentally splashing and getting stuck at the meshing point of the gear 205, thus improving the anti-jamming stability of the application.

[0045] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A tamping machine lifting clamp anti-fall-off structure, comprising a spiral lifting frame (1), two main lifting hydraulic cylinders (101) fixed between the top of the spiral lifting frame (1) and the middle of the bottom of the tamping machine, a fixing seat (4) fixed to the bottom of the spiral lifting frame (1), and an auxiliary lifting hydraulic cylinder (102) fixed to the bottom of the fixing seat (4), characterized in that: Also includes: The U-shaped seat (2) consists of four sets, which are respectively fixedly connected to the front two sides and the rear two sides of the U-shaped starting frame (1); A dual-axis drive motor (401) is fixedly installed on the top of the fixed base (4) and located inside the loop-shaped starting frame (1); The bidirectional thread drive assembly is mounted on the circular starter frame (1) and is fixedly connected to the ends of the two output shafts of the dual-shaft drive motor (401); The anti-jamming relative rotation support assembly consists of four sets, each installed in a corresponding U-shaped seat (2). The bottom of the anti-jamming relative rotation support assembly is fixedly connected to two clamp supports (202). The bottom end of the clamp support (202) is welded and fixed with a clamp disc (203) larger than its outer diameter. The four clamp supports (202) in the middle are rotatably connected to the bottom end of the bidirectional threaded drive assembly on the same side.

2. The drop structure of claim 1, wherein: The bidirectional threaded drive assembly includes a screw (303), a horizontal guide rod (305), a movable seat (304), a rectangular sliding sleeve (3), a rotating sleeve (301), and a connecting rod (302). Two screws (303) are rotatably mounted on the inner walls of the two sides of the circular starting frame (1). The ends of the two screws (303) that are close to each other are fixedly connected to the ends of the two output shafts of the dual-axis drive motor (401). The threads of the two screws (303) have opposite directions. The movable seat (304) There are two of 304) and they are threaded onto the corresponding screws (303). The moving seat (304) is slidably connected between the top inner wall and the bottom inner wall of the spiral lifting frame (1). There are two horizontal guide rods (305) and they are fixedly connected between the inner walls of the two sides of the spiral lifting frame (1). The dual-shaft drive motor (401) and the two screws (303) are located between the two horizontal guide rods (305). The moving seat (304) is slidably fitted onto the two horizontal guide rods (305). The number of rectangular sliding sleeves (3) is two, and both are slidably sleeved on the outside of the loop-shaped starting frame (1). The moving seat (304) is fixedly connected between the inner walls of the front and rear sides of the corresponding rectangular sliding sleeves (3). The number of rotating sleeves (301) is four. The front and rear sides of the rectangular sliding sleeves (3) are rotatably installed with the corresponding rotating sleeves (301). The number of connecting rods (302) is four, and they are welded and fixed to the bottom of the corresponding rotating sleeves (301). The two connecting rods (302) on the left and right are symmetrically arranged. The four clamp supports (202) in the middle are rotatably connected to the bottom of the corresponding connecting rods (302) on the side closest to each other.

3. The drop structure of claim 1, wherein: The anti-jamming relative rotation support assembly includes a rotating shaft (201), a gear (205), and a guard (204). There are two rotating shafts (201) in the same group of anti-jamming relative rotation support assemblies, which are rotatably fitted between the front inner wall and the rear inner wall of the corresponding U-shaped seat (2). The two guards (204) that are opposite each other are fixedly installed on the opposing sides of the two corresponding U-shaped seats (2). The bottom end of the rotating shaft (201) is welded to the top end of the corresponding clamp support (202). One end of the rotating shaft (201) extends into the corresponding U-shaped seat (2). There are two gears (205) in the same group of anti-jamming relative rotation support assemblies, which are welded and sleeved on the corresponding rotating shaft (201). The two gears (205) in the same group of anti-jamming relative rotation support assemblies are both located in the corresponding guards (204) and mesh with each other.

4. The drop structure of claim 1, wherein: A battery is fixedly installed on the top of the rotary starting frame (1) and electrically connected to the dual-shaft drive motor (401) via wires.

5. The drop structure of claim 2, wherein: U-shaped mounting seats are welded and fixed on the side of each of the four clamp supports (202) located in the middle. Stainless steel shafts are welded and fixed between the inner walls of the front and rear sides of the U-shaped mounting seats. A circular sleeve is welded and fixed to the bottom end of the connecting rod (302). A first bearing is fixedly fitted inside the circular sleeve. The inner ring of the first bearing is fixedly fitted with the outer side of the corresponding stainless steel shaft.

6. The drop structure of claim 2, wherein: Both of the two movable seats (304) have threaded holes on their adjacent sides, and the threaded holes are threadedly connected to the corresponding screws (303).

7. The drop structure of claim 1, wherein: The bottom of the extended end of the auxiliary lifting hydraulic cylinder (102) is fixedly connected to a support base.

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