A steel reinforcement cage feeding device for bridge pile driving

Abstract

The present invention relates to a device related to bridge construction, and more specifically to a device for loading steel reinforcement cages for bridge pile driving, including a steel bar conveying mechanism, a mounting base mechanism, a rotating mechanism, and a material receiving mechanism. The steel bar conveying mechanism is fixedly installed on the mounting base mechanism, the rotating mechanism is fixedly installed on the mounting base mechanism, the material receiving mechanism is fixedly installed on the mounting base mechanism, and the material receiving mechanism is fixedly installed on the rotating mechanism. This device can orderly convey single steel bars, can adapt to the processing of steel reinforcement cages of different lengths, can adapt to the processing of steel reinforcement cages of different diameters, does not require manual insertion of steel bars into the steel bar fixing ports, can automatically feed the steel bars, can meet the steel bar fixing requirements of different thicknesses, and does not require secondary fixing.

Description

Technical Field

[0001] The present invention relates to a device related to bridge construction, and more specifically to a steel cage feeding device for bridge pile driving. Background Art

[0002] The main function of the steel cage is the same as that of the longitudinal steel bars in the column, mainly playing a tensile role. The compressive strength of concrete is high, but the tensile strength is very low. It plays a role in restraining the pile body concrete so that it can withstand a certain axial tension.

[0003] During the construction of bridge culverts or high-rise buildings, according to requirements, pile driving of the foundation may be required. The method is to use a machine to punch holes and grind holes with water, and the hole depth reaches the design requirements. Then, a steel cage is lowered into the pile hole, and a conduit is inserted for concrete pouring.

[0004] In addition, when the concrete structure is a columnar or strip-shaped member, no reinforcement is required in the central part, and reinforcement is only arranged under the surface of the concrete member in contact with the air. If this member is independent, the reinforcement arranged around this member is prefabricated in advance, and this is the steel cage. Usually, the prefabricated steel structures such as bored cast-in-place piles, dug piles, and columns are called steel cages.

[0005] The inventor of the present invention found that for the existing steel cage rolling machine, for the feeding of steel bars, it is necessary to manually fix the steel bar head to the designated position of the steel cage rolling machine, and then further fix the steel bar to realize the feeding of the steel cage, which is time-consuming and laborious. Summary of the Invention

[0006] The main technical problem to be solved by the present invention is to provide a steel cage feeding device for bridge pile driving. This device can orderly convey single steel bars, can adapt to the processing of steel cages of different lengths, can adapt to the processing of steel cages of different diameters, does not require manual insertion of steel bars into the steel bar fixing ports, can automatically feed the steel bars, can meet the fixing requirements of steel bars of different thicknesses, and does not require secondary fixing.

[0007] The object of the present invention is achieved by the following technical solutions:

[0008] A steel cage feeding device for bridge pile driving, including a steel bar conveying mechanism, a mounting base mechanism, a rotating mechanism, and a material receiving mechanism. The steel bar conveying mechanism is fixedly installed on the mounting base mechanism, the rotating mechanism is fixedly installed on the mounting base mechanism, the material receiving mechanism is fixedly installed on the mounting base mechanism, and the material receiving mechanism is fixedly installed on the rotating mechanism.

[0009] As a further optimization of the technical solution, in the steel cage feeding device for bridge pile driving of the present invention, the steel bar conveying mechanism includes a first hydraulic cylinder, a movable frame plate, a first motor, a second motor, a conveyor belt device, a cross shaft, a spring, a camshaft rod, and an inclined plate. The output end of the first hydraulic cylinder is fixedly installed with the movable frame plate. A first motor is fixedly installed in the through hole provided on the movable frame plate. A second motor is fixedly installed in the through hole provided on the movable frame plate. The output end of the second motor is fixedly installed with the camshaft rod. The camshaft rod is rotatably installed in the groove provided on the movable frame plate. The output end of the first motor is fixedly installed with the cross shaft. The cross shaft is rotatably installed in the groove provided on the movable frame plate. The inclined plate is rotatably installed in the groove provided on the movable frame plate. A spring is fixedly installed on the inclined plate. The spring is fixedly installed on the movable frame plate. A conveyor belt device is fixedly installed on the movable frame plate.

[0010] As a further optimization of the technical solution, in the steel cage feeding device for bridge pile driving of the present invention, the installation base mechanism includes a strip-shaped bottom plate, a lifting seat, a triangular support frame, a bidirectional threaded rod, and a third motor. The first hydraulic cylinder is fixedly installed on the lifting seat. The movable frame plate is slidably installed in the groove provided on the lifting seat. The lifting seat is fixedly installed on the strip-shaped bottom plate. The triangular support frame is slidably installed in the groove provided on the strip-shaped bottom plate. The triangular support frame is threadedly connected to the bidirectional threaded rod. The bidirectional threaded rod is rotatably installed in the groove provided on the strip-shaped bottom plate. The bidirectional threaded rod is fixedly installed at the output end of the third motor. The third motor is fixedly installed in the groove provided on the strip-shaped bottom plate.

[0011] As a further optimization of the technical solution, in the steel cage feeding device for bridge pile driving of the present invention, the rotating mechanism includes a support plate, a fourth motor, an internal gear ring, a main output sprocket, and an auxiliary support sprocket. The support plate is fixedly installed on the triangular support frame. A fourth motor is fixedly installed in the groove provided on the support plate. The output end of the fourth motor is fixedly installed with the main output sprocket. The main output sprocket meshes with the internal gear ring. The internal gear ring meshes with the auxiliary support sprocket. The auxiliary support sprocket is rotatably installed in the groove provided on the support plate.

[0012] As a further optimization of the technical solution, the receiving mechanism of the steel reinforcement cage feeding device for bridge pile driving in the present invention includes an annular track frame, a connecting circular plate, a support arm rod, a second hydraulic cylinder, a third hydraulic cylinder, a single-tooth claw, a double-tooth claw, and an arc-shaped slide plate. A support arm rod is fixedly installed on the internal gear ring, and the support arm rod is fixedly installed on the connecting circular plate. The annular track frame is fixedly installed on the triangular support frame. A second hydraulic cylinder is fixedly installed on the support arm rod, and a third hydraulic cylinder is fixedly installed on the support arm rod. The output end of the third hydraulic cylinder is fixedly installed with a single-tooth claw, and the single-tooth claw is slidably installed on the support arm rod. The output end of the second hydraulic cylinder is fixedly installed with a double-tooth claw, and the double-tooth claw is slidably installed on the support arm rod. An arc-shaped slide plate is fixedly installed on the support arm rod, and the arc-shaped slide plate is slidably installed in a groove provided on the annular track frame.

[0013] The beneficial effects of the steel reinforcement cage feeding device for bridge pile driving in the present invention are as follows:

[0014] 1. Place the steel bars at one end of the conveyor belt device, below the inclined plate. When the conveyor belt device conveys the steel bars forward, the steel bars will be blocked by the inclined plate. The gap between the inclined plate and the conveyor belt device only allows one steel bar to pass through. Start the first motor, and the first motor drives the cross shaft to rotate. When the first steel bar passes through the cross shaft, the rotation of the cross shaft will block the subsequent steel bars, thereby realizing the forward transportation of single steel bars at intervals. After the steel bar feeding is completed, retract the first hydraulic cylinder. The first hydraulic cylinder drives the movable frame plate to contract, so that the conveyor belt device is disengaged from the working range of the receiving mechanism, avoiding affecting subsequent welding operations.

[0015] 2. Start the second hydraulic cylinder and the third hydraulic cylinder, adjust the single-tooth claw and the double-tooth claw to the corresponding positions at the same time, and start the fourth motor. The fourth motor drives the internal gear ring to rotate through the main output sprocket, and the internal gear ring drives all the support arm rods to rotate at the same time. At this time, the steel bars conveyed by the conveyor belt device are within the range of the single-tooth claw and the double-tooth claw, and the rotating upward support arm rods lift the conveyed steel bars. At this time, the single-tooth claw and the double-tooth claw are combined to form a triangle with the support arm rod to clamp the steel bars inside. The single-tooth claw, the double-tooth claw and the support arm rod can adapt to steel bars of different thicknesses, ensuring the stability of clamping the steel bars, and solving the problem in the prior art that the steel bar heads need to be fixed twice. When a support arm rod completes the steel bar feeding, it rotates upward and moves, and the next support arm rod continues to perform the steel bar feeding operation, achieving the automatic steel bar feeding operation and solving the problem of manual feeding by workers in the prior art.

[0016] 3. The positions of the single-tooth claw and the double-tooth claw can be arbitrarily adjusted through the second hydraulic cylinder and the third hydraulic cylinder, so as to enable the device to meet the feeding requirements of steel reinforcement cages with different diameter requirements.

[0017] 4. Start the third motor. The third motor drives the bidirectional threaded rod to rotate. The bidirectional threaded rod is threadedly connected to the triangular support frame. At this time, the two triangular support frames can drive the two material receiving mechanisms to perform relative displacement respectively, realizing the feeding operation of processing steel reinforcement cages of different lengths. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention will be further described in detail below with reference to the drawings and specific implementation methods.

[0019] Figure 1 FIG. is a three-dimensional structural schematic diagram of a steel reinforcement cage feeding device for bridge pile driving according to the present invention.

[0020] Figure 2 FIG. is a partial three-dimensional structural schematic diagram of a steel reinforcement cage feeding device for bridge pile driving according to the present invention.

[0021] Figure 3 FIG. is a three-dimensional structural schematic diagram of the steel bar conveying mechanism 1 of a steel reinforcement cage feeding device for bridge pile driving according to the present invention.

[0022] Figure 4 FIG. is a three-dimensional structural schematic diagram of the steel bar conveying mechanism 1 of a steel reinforcement cage feeding device for bridge pile driving according to the present invention.

[0023] Figure 5 FIG. is a three-dimensional structural schematic diagram of the steel bar conveying mechanism 1 of a steel reinforcement cage feeding device for bridge pile driving according to the present invention.

[0024] Figure 6 FIG. is a cross-sectional structural schematic diagram of the steel bar conveying mechanism 1 of a steel reinforcement cage feeding device for bridge pile driving according to the present invention.

[0025] Figure 7 FIG. is a three-dimensional structural schematic diagram of the installation base mechanism 2 of a steel reinforcement cage feeding device for bridge pile driving according to the present invention.

[0026] Figure 8 FIG. is a three-dimensional structural schematic diagram of the rotating mechanism 3 of a steel reinforcement cage feeding device for bridge pile driving according to the present invention.

[0027] Figure 9 FIG. is a three-dimensional structural schematic diagram of the rotating mechanism 3 of a steel reinforcement cage feeding device for bridge pile driving according to the present invention.

[0028] Figure 10 FIG. is a cross-sectional structural schematic diagram of the rotating mechanism 3 of a steel reinforcement cage feeding device for bridge pile driving according to the present invention.

[0029] Figure 11 FIG. is a three-dimensional structural schematic diagram of the material receiving mechanism 4 of a steel reinforcement cage feeding device for bridge pile driving according to the present invention.

[0030] Figure 12This is a three-dimensional structural schematic diagram of the material receiving mechanism 4 of a steel reinforcement cage feeding device for bridge pile driving in the present invention.

[0031] In the figure: steel bar conveying mechanism 1; hydraulic cylinder 1-1; movable frame plate 1-2; first motor 1-3; second motor 1-4; conveyor belt device 1-5; cross shaft 1-6; spring 1-7; camshaft rod 1-8; inclined plate 1-9; installation base mechanism 2; strip-shaped bottom plate 2-1; elevation seat 2-2; triangular support frame 2-3; bidirectional threaded rod 2-4; third motor 2-5; rotating mechanism 3; support plate 3-1; fourth motor 3-2; internal gear ring 3-3; main output sprocket 3-4; auxiliary support sprocket 3-5; material receiving mechanism 4; annular track frame 4-1; connecting circular plate 4-2; support arm rod 4-3; hydraulic cylinder 4-4; hydraulic cylinder 4-5; single-tooth claw 4-6; double-tooth claw 4-7; arc-shaped slide plate 4-8. Specific embodiments

[0032] The present invention will be further described in detail below with reference to the accompanying drawings. Specific embodiment one:

[0034] The following combines Figures 1-12 To illustrate this embodiment, a steel reinforcement cage feeding device for bridge pile driving includes a steel bar conveying mechanism 1, an installation base mechanism 2, a rotating mechanism 3, and a material receiving mechanism 4. The steel bar conveying mechanism 1 is fixedly installed on the installation base mechanism 2, the rotating mechanism 3 is fixedly installed on the installation base mechanism 2, the material receiving mechanism 4 is fixedly installed on the installation base mechanism 2, and the material receiving mechanism 4 is fixedly installed on the rotating mechanism 3. Specific embodiment two:

[0036] The following combines Figures 1-12 To illustrate this embodiment, this embodiment further describes embodiment one. The steel bar conveying mechanism 1 includes a hydraulic cylinder 1-1, a movable frame plate 1-2, a first motor 1-3, a second motor 1-4, a conveyor belt device 1-5, a cross shaft 1-6, a spring 1-7, a camshaft rod 1-8, and an inclined plate 1-9. The output end of the hydraulic cylinder 1-1 is fixedly installed with a movable frame plate 1-2. A first motor 1-3 is fixedly installed in the through hole provided on the movable frame plate 1-2. A second motor 1-4 is fixedly installed in the through hole provided on the movable frame plate 1-2. The output end of the second motor 1-4 is fixedly installed with a camshaft rod 1-8. The camshaft rod 1-8 is rotatably installed in the groove provided on the movable frame plate 1-2. The output end of the first motor 1-3 is fixedly installed with a cross shaft 1-6. The cross shaft 1-6 is rotatably installed in the groove provided on the movable frame plate 1-2. The inclined plate 1-9 is rotatably installed in the groove provided on the movable frame plate 1-2. A spring 1-7 is fixedly installed on the inclined plate 1-9. The spring 1-7 is fixedly installed on the movable frame plate 1-2. A conveyor belt device 1-5 is fixedly installed on the movable frame plate 1-2. Embodiment 3:

[0038] The following is combined with Figures 1-12 to describe this embodiment. This embodiment further describes Embodiment 2. The installation base mechanism 2 includes a strip-shaped bottom plate 2-1, a lifting seat 2-2, a triangular support frame 2-3, a bidirectional threaded rod 2-4, and a third motor 2-5. The hydraulic cylinder 1-1 is fixedly installed on the lifting seat 2-2. An active frame plate 1-2 is slidably installed in the groove provided on the lifting seat 2-2. The lifting seat 2-2 is fixedly installed on the strip-shaped bottom plate 2-1. A triangular support frame 2-3 is slidably installed in the groove provided on the strip-shaped bottom plate 2-1. The triangular support frame 2-3 is threadedly connected to the bidirectional threaded rod 2-4. The bidirectional threaded rod 2-4 is rotatably installed in the groove provided on the strip-shaped bottom plate 2-1. The bidirectional threaded rod 2-4 is fixedly installed at the output end of the third motor 2-5. The third motor 2-5 is fixedly installed in the groove provided on the strip-shaped bottom plate 2-1. Embodiment 4:

[0040] The following is combined with Figures 1-12 to describe this embodiment. This embodiment further describes Embodiment 3. The rotation mechanism 3 includes a support plate 3-1, a fourth motor 3-2, an internal gear ring 3-3, a main output sprocket 3-4, and an auxiliary support sprocket 3-5. The support plate 3-1 is fixedly installed on the triangular support frame 2-3. The fourth motor 3-2 is fixedly installed in the groove provided on the support plate 3-1. The output end of the fourth motor 3-2 is fixedly installed with the main output sprocket 3-4. The main output sprocket 3-4 meshes with the internal gear ring 3-3. The internal gear ring 3-3 meshes with the auxiliary support sprocket 3-5. The auxiliary support sprocket 3-5 is rotatably installed in the groove provided on the support plate 3-1. Embodiment 5:

[0042] The following is combined with Figures 1-12To describe this embodiment, this embodiment further elaborates on Embodiment 4. The material receiving mechanism 4 includes an annular track frame 4-1, a connecting circular plate 4-2, a support arm rod 4-3, a second hydraulic cylinder 4-4, a third hydraulic cylinder 4-5, a single-tooth claw 4-6, a double-tooth claw 4-7, and an arc-shaped slide plate 4-8. A support arm rod 4-3 is fixedly installed on the internal gear ring 3-3. The support arm rod 4-3 is fixedly installed on the connecting circular plate 4-2. The annular track frame 4-1 is fixedly installed on the triangular support frame 2-3. A second hydraulic cylinder 4-4 is fixedly installed on the support arm rod 4-3. A third hydraulic cylinder 4-5 is fixedly installed on the support arm rod 4-3. The output end of the third hydraulic cylinder 4-5 is fixedly installed with a single-tooth claw 4-6. The single-tooth claw 4-6 is slidably installed on the support arm rod 4-3. The output end of the second hydraulic cylinder 4-4 is fixedly installed with a double-tooth claw 4-7. The double-tooth claw 4-7 is slidably installed on the support arm rod 4-3. An arc-shaped slide plate 4-8 is fixedly installed on the support arm rod 4-3. The arc-shaped slide plate 4-8 is slidably installed in a groove provided on the annular track frame 4-1. The arc-shaped slide plate 4-8 slides in the groove of the annular track frame 4-1, providing good stability.

[0043] The working principle of a steel reinforcement cage feeding device for bridge pile driving in the present invention is as follows:

[0044] Place the steel bars at one end of the conveyor belt device 1-5, below the inclined plate 1-9. When the conveyor belt device 1-5 conveys the steel bars forward, the steel bars will be blocked by the inclined plate 1-9. The gap between the inclined plate 1-9 and the conveyor belt device 1-5 only allows one steel bar to pass through. Start the first motor 1-3. The first motor 1-3 drives the cross shaft 1-6 to rotate. When the first steel bar passes through the cross shaft 1-6, the rotation of the cross shaft 1-6 will block the subsequent steel bars, thereby realizing the forward transportation of single steel bars at intervals. After the steel bar feeding is completed, retract the first hydraulic cylinder 1-1. The first hydraulic cylinder 1-1 drives the movable frame plate 1-2 to retract, so that the conveyor belt device 1-5 is disengaged from the operation range of the material receiving mechanism 4, avoiding affecting subsequent welding operations.

[0045] Start the second hydraulic cylinder 4-4 and the third hydraulic cylinder 4-5, adjust the single-tooth claw 4-6 and the double-tooth claw 4-7 to the corresponding positions simultaneously, and start the fourth motor 3-2. The fourth motor 3-2 drives the internal gear ring 3-3 to rotate through the main output sprocket 3-4. The internal gear ring 3-3 drives all the support arm rods 4-3 to rotate at the same time. At this time, the steel bars conveyed by the conveyor device 1-5 are within the range of the single-tooth claw 4-6 and the double-tooth claw 4-7. The support arm rods 4-3 rotating upward lift the conveyed steel bars. At this time, the single-tooth claw 4-6 and the double-tooth claw 4-7 are combined to form a triangle with the support arm rod 4-3, clamping the steel bars inside. The single-tooth claw 4-6, the double-tooth claw 4-7 and the support arm rod 4-3 can adapt to steel bars of different thicknesses, ensuring the stability of clamping the steel bars, solving the problem in the prior art that the steel bar heads need to be fixed twice. When a support arm rod 4-3 finishes the steel bar feeding, it rotates upward and moves, and the next support arm rod 4-3 continues the steel bar feeding operation, achieving the automatic steel bar feeding operation and solving the problem of manual feeding by workers in the prior art.

[0046] The positions of the single-tooth claw 4-6 and the double-tooth claw 4-7 can be adjusted arbitrarily through the second hydraulic cylinder 4-4 and the third hydraulic cylinder 4-5, so as to realize the feeding requirement of the device for the steel cage with different diameter requirements.

[0047] Start the third motor 2-5. The third motor 2-5 drives the bidirectional threaded rod 2-4 to rotate. The bidirectional threaded rod 2-4 is threadedly connected to the triangular support frame 2-3. At this time, the two triangular support frames 2-3 can drive the two material receiving mechanisms 4 to move relatively respectively, realizing the feeding operation of processing steel cages with different lengths.

[0048] Certainly, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples either. The changes, modifications, additions or substitutions made by those of ordinary skill in the art within the essence of the present invention also belong to the protection scope of the present invention.

Claims

1. A steel bar cage feeding device for bridge pile driving, comprising a steel bar conveying mechanism (1), a mounting base mechanism (2), a rotating mechanism (3) and a material receiving mechanism (4), characterized in that: The described steel bar conveying mechanism (1) is fixedly installed on the installation base mechanism (2), the rotating mechanism (3) is fixedly installed on the installation base mechanism (2), the material receiving mechanism (4) is fixedly installed on the installation base mechanism (2), and the material receiving mechanism (4) is fixedly installed on the rotating mechanism (3). The described steel bar conveying mechanism (1) includes a first hydraulic cylinder (1-1), a movable frame plate (1-2), a first motor (1-3), a second motor (1-4), a conveyor belt device (1-5), a cross shaft (1-6), a spring (1-7), a camshaft rod (1-8), and an inclined plate (1-9). The output end of the first hydraulic cylinder (1-1) is fixedly installed with a movable frame plate (1-2). A first motor (1-3) is fixedly installed in the through hole provided on the movable frame plate (1-2), and a second motor (1-4) is fixedly installed in the through hole provided on the movable frame plate (1-2). The output end of the second motor (1-4) is fixedly installed with a camshaft rod (1-8), and the camshaft rod (1-8) is rotatably installed in the groove provided on the movable frame plate (1-2). The output end of the first motor (1-3) is fixedly installed with a cross shaft (1-6), and the cross shaft (1-6) is rotatably installed in the groove provided on the movable frame plate (1-2). The inclined plate (1-9) is rotatably installed in the groove provided on the movable frame plate (1-2), a spring (1-7) is fixedly installed on the inclined plate (1-9), the spring (1-7) is fixedly installed on the movable frame plate (1-2), and a conveyor belt device (1-5) is fixedly installed on the movable frame plate (1-2).

2. The steel cage feeding device for bridge pile driving according to claim 1, characterized in that: The described installation base mechanism (2) includes a strip-shaped bottom plate (2-1), a lifting seat (2-2), a triangular support frame (2-3), a bidirectional threaded rod (2-4), and a third motor (2-5). The first hydraulic cylinder (1-1) is fixedly installed on the lifting seat (2-2), and the movable frame plate (1-2) is slidably installed in the groove provided on the lifting seat (2-2). The lifting seat (2-2) is fixedly installed on the strip-shaped bottom plate (2-1), and the triangular support frame (2-3) is slidably installed in the groove provided on the strip-shaped bottom plate (2-1). The triangular support frame (2-3) is threadedly connected to the bidirectional threaded rod (2-4), the bidirectional threaded rod (2-4) is rotatably installed in the groove provided on the strip-shaped bottom plate (2-1), the bidirectional threaded rod (2-4) is fixedly installed at the output end of the third motor (2-5), and the third motor (2-5) is fixedly installed in the groove provided on the strip-shaped bottom plate (2-1).

3. The steel cage feeding device for bridge pile driving according to claim 2, characterized in that: The described rotating mechanism (3) includes a support plate (3-1), a fourth motor (3-2), an internal gear ring (3-3), a main output sprocket (3-4), and an auxiliary support sprocket (3-5). The support plate (3-1) is fixedly installed on the triangular support frame (2-3). The fourth motor (3-2) is fixedly installed in a groove provided on the support plate (3-1). The output end of the fourth motor (3-2) is fixedly installed with the main output sprocket (3-4). The main output sprocket (3-4) meshes with the internal gear ring (3-3). The internal gear ring (3-3) meshes with the auxiliary support sprocket (3-5). The auxiliary support sprocket (3-5) is rotatably installed in a groove provided on the support plate (3-1).

4. The steel cage feeding device for bridge pile driving according to claim 3, characterized in that: The described material receiving mechanism (4) includes an annular track frame (4-1), a connecting circular plate (4-2), a support arm rod (4-3), a second hydraulic cylinder (4-4), a third hydraulic cylinder (4-5), a single-tooth claw (4-6), a double-tooth claw (4-7), and an arc-shaped sliding plate (4-8). A support arm rod (4-3) is fixedly installed on the internal gear ring (3-3). The support arm rod (4-3) is fixedly installed on the connecting circular plate (4-2). The annular track frame (4-1) is fixedly installed on the triangular support frame (2-3). A second hydraulic cylinder (4-4) is fixedly installed on the support arm rod (4-3). A third hydraulic cylinder (4-5) is fixedly installed on the support arm rod (4-3). The output end of the third hydraulic cylinder (4-5) is fixedly installed with the single-tooth claw (4-6). The single-tooth claw (4-6) is slidably installed on the support arm rod (4-3). The output end of the second hydraulic cylinder (4-4) is fixedly installed with the double-tooth claw (4-7). The double-tooth claw (4-7) is slidably installed on the support arm rod (4-3). An arc-shaped sliding plate (4-8) is fixedly installed on the support arm rod (4-3). The arc-shaped sliding plate (4-8) is slidably installed in a groove provided on the annular track frame (4-1).

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