A hammering dynamic load testing pile machine
Through the coordinated design of the tracked chassis, clamping mechanism, and guiding mechanism, the stability and ease of operation of traditional hammer-type pile testing equipment have been solved, realizing the automation and efficient detection of hammer testing.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHANGSHA TIANWEI ENG MASCH MANUFACUTURE CO LTD
- Filing Date
- 2025-07-30
- Publication Date
- 2026-07-14
AI Technical Summary
Traditional hammer-type pile testing equipment has an unreasonable structural design, poor machine stability, and inconvenient clamping and releasing operations, which affects the accuracy and efficiency of the test results.
The equipment employs a coordinated design of tracked chassis, clamping mechanism, lifting cylinder and guiding mechanism to achieve flexible movement and automated hammering test. The hammering avoidance hole is used to accurately act on the pile body, and the adjustable height auxiliary support base ensures the stability of the equipment.
It improves the accuracy and efficiency of hammer impact testing, reduces equipment noise and wear, extends service life, and adapts to different terrains and testing needs.
Smart Images
Figure CN224495236U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of piling equipment technology, specifically to a hammer-driven dynamic load testing piling machine. Background Technology
[0002] In the field of building construction, pile foundations, as the foundation of a building, directly affect the stability and safety of the entire structure. Currently, various methods are commonly used for pile foundation quality testing, with hammer testing being one of the more intuitive and effective methods. However, traditional hammer-type pile testing equipment suffers from structural design flaws, such as poor machine stability, prone to swaying during hammering, affecting the accuracy of test results; and inconvenient clamping and releasing of the counterweight mechanism, leading to low work efficiency and difficulty in meeting the testing needs of different construction scenarios. Therefore, there is an urgent need to design a structurally optimized and easily operable hammer-driven dynamic load pile testing machine. Utility Model Content
[0003] The purpose of this utility model is to provide a hammer dynamic load testing pile machine with a compact structure, stable hammering force, automated hammering test and high testing efficiency.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] A hammer-driven dynamic load testing pile driver includes a tracked chassis, a hammering device, and a connecting frame. The tracked chassis is mounted on both sides of the connecting frame, and a hammering clearance hole is provided in the middle of the connecting frame. The hammering device includes a clamping and releasing mechanism, a counterweight mechanism, and multiple sets of lifting cylinders. The clamping and releasing mechanism has a ring structure and can clamp and release the counterweight mechanism located in the middle of its ring. The multiple sets of lifting cylinders are vertically installed in the hammering clearance hole and symmetrically arranged on the outside of the clamping and releasing mechanism, with their telescopic ends pointing vertically upward and hinged to the clamping and releasing mechanism. The vertical projection planes of the clamping and releasing mechanism and the counterweight mechanism are located in the hammering clearance hole. During operation, the clamping and releasing mechanism first clamps the counterweight mechanism, the lifting cylinders lift the clamping and releasing mechanism to the highest point, and then the clamping and releasing mechanism releases the counterweight mechanism so that it falls freely from the highest point and can pass through the hammering clearance hole to hammer the pile below for testing.
[0006] Furthermore, the hammering device also includes a guide mechanism, which includes four sets of guide columns vertically mounted on the connecting frame and located in the hammering clearance hole. A rectangular limiting space is formed between the four sets of guide columns. The counterweight mechanism is placed in the rectangular limiting space and does not contact the guide columns. The clamping mechanism has an annular rectangular structure, and its inner ring is movably fitted on the outside of the four sets of guide columns.
[0007] Furthermore, the clamping and releasing mechanism includes a horizontally arranged annular rectangular box and two sets of clamping and releasing cylinders horizontally installed in the inner cavities at both ends of the annular rectangular box. The clamping and releasing mechanism realizes the clamping and releasing movement of the counterweight mechanism by the horizontal extension and retraction of the telescopic rods of the two sets of clamping and releasing cylinders. There are four sets of lifting cylinders, which are symmetrically distributed on the outer sides of both ends of the annular rectangular box. The cylinder body of the lifting cylinder is installed on the connecting frame, and the telescopic end is hinged to the top of the outer side of the annular rectangular box.
[0008] Furthermore, the guide post has a square tube structure, and the inner four corners of the annular rectangular box are provided with rollers for contacting the outer wall of the square tube.
[0009] Furthermore, each end of the connecting frame is provided with two sets of symmetrically arranged auxiliary support seats, and the auxiliary support seats are height-adjustable structures.
[0010] Furthermore, the auxiliary support base includes an L-shaped mounting base and an adjusting cylinder. The cylinder body of the adjusting cylinder is vertically mounted on the horizontal side of the L-shaped mounting base, and the telescopic rod of the adjusting cylinder extends downward from the horizontal side and is equipped with a support foot at its end. The L-shaped mounting base is also provided with reinforcing plates on both sides.
[0011] Furthermore, the counterweight mechanism includes a rectangular counterweight box and multiple rectangular counterweight blocks. The counterweight box has a rectangular inner cavity with an open top. Two symmetrically arranged connecting shafts are vertically mounted in the middle of the rectangular bottom plate. The counterweight blocks have two vertical through holes in the middle. Multiple counterweight blocks are stacked in the rectangular inner cavity of the counterweight box and pass through the vertical through holes via the connecting shafts to form a detachable integral structure.
[0012] Furthermore, the end of the telescopic rod of the clamping cylinder is equipped with a clamp, and the side of the clamp that is in contact with the counterweight mechanism is provided with an anti-slip groove.
[0013] Furthermore, the lifting cylinder, clamping cylinder, and adjusting cylinder are all connected to the hydraulic control system, which can automatically adjust the extension and retraction speed and stroke of the lifting cylinder and clamping cylinder according to preset hammering force and height parameters.
[0014] Furthermore, the connecting frame includes a rectangular connecting plate, two sets of longitudinal connecting brackets, and two sets of transverse connecting brackets. The hammer impact avoidance hole is rectangular and is located in the middle of the rectangular connecting plate. The two sets of longitudinal connecting brackets are symmetrically installed below the connecting plate and located at the hammer impact avoidance hole. The two sets of transverse connecting brackets are symmetrically installed below the two sets of longitudinal connecting brackets and located at the hammer impact avoidance hole. The bottom end of the guide column is connected to the middle of the longitudinal connecting bracket, and the auxiliary support seat is installed at both ends of the longitudinal connecting bracket. The cylinder body of the lifting cylinder is installed in the middle of the transverse connecting bracket through a hinge seat, and the track chassis is installed at both ends of the transverse connecting bracket.
[0015] Compared with the prior art, the present invention has the following advantages:
[0016] 1. The tracked chassis allows for flexible movement of the equipment, adapting to the relocation needs of different testing sites. Utilizing the coordinated action of the clamping mechanism and the lifting cylinder, the counterweight mechanism can be stably lifted and allowed to fall freely at its highest point. The hammer strike is precisely applied to the pile body through the impact avoidance hole, ensuring the stability of the hammering force (relying on the gravitational potential energy conversion of the free-falling counterweight mechanism) and automating the hammering test, thus improving testing efficiency. The overall structure is compact, with all components working in tandem to quickly complete the "clamping-lifting-releasing-hammering" cycle, meeting continuous testing requirements.
[0017] 2. The four sets of guide columns of the guiding mechanism form a rectangular limiting space, which can accurately constrain the movement trajectory of the counterweight mechanism and the clamping mechanism, effectively avoiding the hammer position deviation caused by lateral offset when the counterweight mechanism falls freely, and improving the accuracy of the hammer test; at the same time, the guiding effect of the guide columns on the clamping mechanism can reduce the shaking during its lifting process, reduce the noise of equipment operation and component wear, and extend the service life of the equipment.
[0018] 3. The height-adjustable auxiliary support base can provide auxiliary support to both ends of the connecting frame during equipment operation. By adjusting the height, it can compensate for the tilt of the equipment caused by terrain undulations, ensuring that the whole machine remains in a horizontal and stable state during testing. It can also prevent the hammer position from shifting or the trajectory deviation of the counterweight mechanism from falling due to equipment shaking, improve the reliability of test data, and reduce the structural stress of the equipment when operating on uneven ground, thus protecting the core components.
[0019] 4. The counterweight mechanism is a detachable structure, which makes it easy to flexibly increase or decrease the number of counterweights according to testing needs, and adapt to different pile bearing capacity testing standards. Attached Figure Description
[0020] Figure 1 This is a three-dimensional structural diagram of the present invention.
[0021] Figure 2 This is a schematic diagram of the main structure of this utility model.
[0022] Figure 3 This is a side view of the structure of this utility model.
[0023] Figure 4 This is a top view of the structure of this utility model.
[0024] Figure 5 This is a three-dimensional structural diagram of the present invention after the tracked chassis has been removed.
[0025] Figure 6This is a side view of the structure of this utility model after the tracked chassis has been removed (when the counterweight mechanism is at its lowest point).
[0026] Figure 7 yes Figure 6 Enlarged cross-sectional view of the structure along the AA direction.
[0027] Figure 8 This is a three-dimensional structural diagram of the counterweight box in this utility model.
[0028] Legend:
[0029] 1. Tracked chassis; 2. Hammering device; 3. Connecting frame; 31. Rectangular connecting plate; 32. Longitudinal connecting bracket; 33. Transverse connecting bracket; 4. Auxiliary support seat; 41. L-shaped mounting seat; 42. Adjusting cylinder; 5. Clamping mechanism; 6. Counterweight mechanism; 61. Counterweight box; 62. Counterweight block; 63. Connecting shaft; 7. Lifting cylinder; 8. Clamping cylinder; 9. Guide column; 10. Roller. Detailed Implementation
[0030] The utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0031] like Figures 1-8 As shown, an embodiment of the hammer-driven dynamic load testing pile driver of this utility model includes a tracked chassis 1, a hammering device 2, and a connecting frame 3. The tracked chassis 1 is mounted on both sides of the connecting frame 3, and a hammering clearance hole is opened in the middle of the connecting frame 3. The hammering device 2 includes a clamping and releasing mechanism 5, a counterweight mechanism 6, and multiple sets of lifting cylinders 7. The clamping and releasing mechanism 5 has a ring structure and can clamp and release the counterweight mechanism 6 located in the middle of its ring. Multiple sets of lifting cylinders 7 are vertically installed in the hammering clearance hole and symmetrically arranged on the outside of the clamping and releasing mechanism 5, with the telescopic ends pointing vertically upward and hinged to the clamping and releasing mechanism 5. The vertical projection planes of the clamping and releasing mechanism 5 and the counterweight mechanism 6 are located in the hammering clearance hole. During operation, the clamping and releasing mechanism 5 first clamps the counterweight mechanism 6, and the lifting cylinders 7 lift the clamping and releasing mechanism 5 to the highest point. The clamping and releasing mechanism 5 then releases the counterweight mechanism 6 so that it falls freely from the highest point and can pass through the hammering clearance hole to hammer the pile below for testing. In this invention, the tracked chassis enables flexible movement of the equipment, adapting to the relocation needs of different testing sites. The coordinated action of the clamping mechanism and the lifting cylinder allows the counterweight mechanism to be stably lifted and allowed to fall freely at its highest point. The hammer strike, through the avoidance hole, precisely targets the pile, ensuring the stability of the hammering force (relying on the gravitational potential energy conversion of the free-falling counterweight mechanism) and automating the hammering test, thus improving testing efficiency. The overall structure is compact, with all components working in tandem to quickly complete the "clamping-lifting-releasing-hammering" cycle, meeting continuous testing requirements.
[0032] In this embodiment, the hammering device 2 also includes a guiding mechanism, which comprises four sets of guide posts 9 vertically mounted on the connecting frame 3 and located within the hammering clearance holes. A rectangular limiting space is formed between the four sets of guide posts 9. The counterweight mechanism 6 is placed within this space and does not contact the guide posts 9. The clamping mechanism 5 has a ring-shaped rectangular structure, with its inner ring movably fitted around the outside of the four sets of guide posts 9. The top of each guide post 9 is higher than the highest point of the clamping mechanism 5. The four sets of guide posts of the guiding mechanism form a rectangular limiting space, which can precisely constrain the movement trajectory of the counterweight mechanism and the clamping mechanism, effectively preventing hammering position deviations caused by lateral offset when the counterweight mechanism falls freely, thus improving the accuracy of the hammering test. Simultaneously, the guiding effect of the guide posts on the clamping mechanism reduces swaying during its lifting process, lowers equipment operating noise and component wear, and extends the equipment's service life.
[0033] In this embodiment, the clamping and releasing mechanism 5 includes a horizontally arranged annular rectangular box and two sets of clamping and releasing cylinders 8 horizontally installed in the inner cavities at both ends of the annular rectangular box. The clamping and releasing mechanism 5 achieves clamping and releasing of the counterweight mechanism 6 by horizontally extending and retracting the telescopic rods of the two sets of clamping and releasing cylinders 8. There are four sets of lifting cylinders 7, which are symmetrically arranged on the outer sides of both ends of the annular rectangular box. The cylinder body of the lifting cylinder 7 is mounted on the connecting frame 3, and the telescopic end is hinged to the outer top of the annular rectangular box. The two sets of clamping and releasing cylinders can form a uniform clamping force on the counterweight mechanism from both ends, which can improve the reliability of the clamping action. The four sets of symmetrically arranged lifting cylinders provide a balanced lifting force to the clamping and releasing mechanism, which can reduce the off-center load phenomenon during the lifting process, reduce the force loss of the cylinder, and at the same time ensure that the counterweight mechanism can be lifted to the preset height, ensuring the consistency of the hammering energy.
[0034] In this embodiment, the guide column 9 has a square tube structure, and rollers 10 are provided on the side walls at the four corners of the inner ring of the annular rectangular box for contacting the outer wall of the square tube. Angle steel is also installed on the outer sides of the square tube guide column 9 corresponding to the rollers and the counterweight mechanism at opposite angles to reinforce it and prevent the counterweight mechanism from hitting the guide column during free fall. The contact between the rollers on the annular rectangular box and the outer wall of the square tube converts sliding friction into rolling friction, which significantly reduces the resistance during the up-and-down movement of the clamping mechanism, reduces component wear, improves the smoothness of movement, and reduces the energy consumption of the equipment.
[0035] In this embodiment, two sets of symmetrically arranged auxiliary support seats 4 are provided at both ends of the connecting frame 3. The auxiliary support seats 4 are height-adjustable structures. The height-adjustable auxiliary support seats can provide auxiliary support to both ends of the connecting frame during equipment operation. By adjusting the height, the equipment tilt caused by terrain undulations can be compensated, ensuring that the whole machine remains horizontal and stable during testing. This avoids the offset of the hammer impact position or the deviation of the counterweight mechanism's falling trajectory caused by equipment shaking, which can further improve the reliability of test data. At the same time, it reduces the structural stress of the equipment when operating on uneven ground and protects the core components.
[0036] In this embodiment, the auxiliary support base 4 includes an L-shaped mounting base 41 and an adjusting cylinder 42. The cylinder body of the adjusting cylinder 42 is vertically mounted on the horizontal side of the L-shaped mounting base 41. The telescopic rod of the adjusting cylinder 42 extends downward from the horizontal side and is equipped with a disc-shaped support foot (not shown in the figure, prior art) at its end. Reinforcing plates are also provided on both sides of the L-shaped mounting base 41. The telescopic function of the adjusting cylinder can achieve precise fine-tuning of the support height, quickly adapt to the support requirements of complex terrain, and ensure the stability of the equipment under various working conditions.
[0037] In this embodiment, the counterweight mechanism 6 includes a rectangular counterweight box 61 and multiple rectangular counterweight blocks 62. The counterweight box 61 has a rectangular inner cavity with an open top. Two symmetrically arranged connecting shafts 63 are vertically mounted in the middle of the rectangular base plate. Two vertical through holes are symmetrically opened in the middle of the rectangular counterweight blocks 62. Multiple rectangular counterweight blocks 62 are stacked in the rectangular inner cavity of the counterweight box 61 and are connected by connecting shafts 63 through the vertical through holes of the counterweight blocks to form a detachable integral structure. This structure allows the total weight of the counterweight mechanism to be flexibly adjusted according to testing requirements (increasing or decreasing the number of counterweight blocks) to adapt to different pile bearing capacity testing standards. The four outer corners of the rectangular counterweight box have concave right angles. When the counterweight mechanism 6 is placed within the limiting space formed by four sets of guide columns, the concave right angles correspond to the square tube guide columns. The concave right angles allow both ends and sides of the rectangular counterweight box to be located between adjacent guide columns, providing better limiting effect.
[0038] In this embodiment, a clamp is installed at the end of the telescopic rod of the clamping cylinder 8. The side of the clamp that contacts the counterweight mechanism 6 has an anti-slip groove (not shown in the figure, prior art). This increases the contact friction with the counterweight mechanism, effectively preventing relative slippage of the counterweight mechanism during clamping and lifting, ensuring the reliability of the clamping and releasing action; avoiding insufficient lifting height or deviation in the falling position of the counterweight mechanism due to slippage, ensuring the stability of the hammering energy and the accuracy of the test results, while reducing wear on the clamp and the counterweight mechanism.
[0039] In this embodiment, the lifting cylinder 7, the clamping cylinder 8, and the adjusting cylinder 42 are all connected to the hydraulic control system (refer to the prior art). The hydraulic control system can automatically adjust the extension and retraction speed and stroke of the lifting cylinder 7 and the clamping cylinder 8 according to the preset hammering force and height parameters.
[0040] In this embodiment, the connecting frame 3 includes a rectangular connecting plate 31, two sets of longitudinal connecting brackets 32, and two sets of transverse connecting brackets 33. The hammering avoidance hole is rectangular and located in the middle of the rectangular connecting plate 31. The two sets of longitudinal connecting brackets 32 (preferably U-shaped channel steel structure, with the openings of the two sets of U-shaped channels arranged opposite each other) are symmetrically installed below the connecting plate 31 and located at the hammering avoidance hole. The two sets of transverse connecting brackets 33 (preferably square or rectangular tube structure) are symmetrically installed below the two sets of longitudinal connecting brackets 32 and located at the hammering avoidance hole. The bottom end of the guide column 9 is provided with a slot corresponding to the opening side of the longitudinal connecting bracket 32 and is engaged in the middle of the longitudinal connecting bracket 32. The vertical side of the L-shaped mounting seat 41 of the auxiliary support seat 4 is welded to the end of the longitudinal connecting bracket 32. The cylinder body of the lifting cylinder 7 is mounted in the middle of the transverse connecting bracket 33 through a hinge seat. The track chassis 1 is mounted at both ends of the transverse connecting bracket 33.
[0041] Working principle:
[0042] In practical use, the pile testing machine is first moved to the construction site of the pile foundation to be tested via a tracked chassis. Depending on the flatness of the construction site, the auxiliary support base is adjusted to ensure it is stably supported on the ground.
[0043] First, operate the clamping cylinder to extend its telescopic rod and clamp the counterweight mechanism. Then, control the lifting cylinder to extend upwards, raising the counterweight mechanism and the clamping mechanism together to a preset height. This height can be monitored in real time by sensors in the hydraulic control system and precisely controlled according to preset parameters.
[0044] After the counterweight mechanism and the clamping mechanism rise to their highest point, the clamping cylinder is operated to retract, releasing the counterweight mechanism so that it falls freely under gravity, and a hammering test is performed on the pile located below the hammering avoidance hole.
[0045] After the hammer test is completed, the lifting cylinder retracts, causing the clamping mechanism to descend and clamp the counterweight mechanism again. The lifting cylinder is then used to lift the counterweight mechanism to a certain height, facilitating the movement of the equipment and the next testing operation.
[0046] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. 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 hammer-driven dynamic load testing pile driver, characterized in that, The device includes a tracked chassis (1), a hammering device (2), and a connecting frame (3). The tracked chassis (1) is mounted on both sides of the connecting frame (3). A hammering clearance hole is provided in the middle of the connecting frame (3). The hammering device (2) includes a clamping mechanism (5), a counterweight mechanism (6), and multiple sets of lifting cylinders (7). The clamping mechanism (5) has a ring structure and can clamp and release the counterweight mechanism (6) located in the middle of its ring. Multiple sets of lifting cylinders (7) are vertically mounted in the hammering clearance hole. The inner and outer sides of the clamping mechanism (5) are symmetrically arranged, with the telescopic end vertically upward and hinged to the clamping mechanism (5). The vertical projection plane of the clamping mechanism (5) and the counterweight mechanism (6) is located inside the hammering avoidance hole. During operation, the clamping mechanism (5) first clamps the counterweight mechanism (6), and the lifting cylinder (7) lifts the clamping mechanism (5) to the highest point. Then the clamping mechanism (5) releases the counterweight mechanism (6) so that it can fall freely at the highest point and pass through the hammering avoidance hole to hammer the pile below.
2. The hammer-driven dynamic load testing pile driver according to claim 1, characterized in that: The hammering device (2) also includes a guide mechanism, which includes four sets of guide columns (9) vertically mounted on the connecting frame (3) and located in the hammering clearance hole. A rectangular limiting space is formed between the four sets of guide columns (9). The counterweight mechanism (6) is placed in the rectangular limiting space and does not contact the guide columns (9). The clamping mechanism (5) has an annular rectangular structure, and its inner ring is movably fitted on the outside of the four sets of guide columns (9).
3. The hammer-driven dynamic load testing pile driver according to claim 2, characterized in that: The clamping and releasing mechanism (5) includes a horizontally arranged annular rectangular box and two sets of clamping and releasing cylinders (8) horizontally installed in the inner cavities at both ends of the annular rectangular box. The clamping and releasing mechanism (5) achieves clamping and releasing of the counterweight mechanism (6) by horizontally extending and retracting the telescopic rods of the two sets of clamping and releasing cylinders (8). There are four sets of lifting cylinders (7), which are symmetrically arranged on the outer sides of both ends of the annular rectangular box. The cylinder body of the lifting cylinder (7) is installed on the connecting frame (3), and the telescopic end is hinged to the outer top of the annular rectangular box.
4. The hammer-driven dynamic load testing pile driver according to claim 3, characterized in that: The guide post (9) has a square tube structure, and the inner four corners of the annular rectangular box are provided with rollers (10) for contacting the outer side wall of the square tube.
5. The hammer-driven dynamic load testing pile driver according to claim 2, characterized in that: The connecting frame (3) has two sets of symmetrically arranged auxiliary support seats (4) at both ends, and the auxiliary support seats (4) are adjustable in height.
6. The hammer-driven dynamic load testing pile driver according to claim 5, characterized in that: The auxiliary support base (4) includes an L-shaped mounting base (41) and an adjusting cylinder (42). The cylinder body of the adjusting cylinder (42) is vertically mounted on the horizontal side of the L-shaped mounting base (41). The telescopic rod of the adjusting cylinder (42) extends downward from the horizontal side and is equipped with a support foot at the end. The L-shaped mounting base (41) is also provided with reinforcing plates on both sides.
7. The hammer-driven dynamic load testing pile driver according to claim 2, characterized in that: The counterweight mechanism (6) includes a rectangular counterweight box (61) and multiple rectangular counterweight blocks (62). The counterweight box (61) has a rectangular inner cavity with an open top. Two symmetrically arranged connecting shafts (63) are vertically installed in the middle of the rectangular bottom plate. The counterweight blocks (62) have two vertical through holes in the middle. Multiple counterweight blocks (62) are stacked in the rectangular inner cavity of the counterweight box (61) and pass through the vertical through holes via the connecting shafts (63) to form a detachable integral structure.
8. The hammer-driven dynamic load testing pile driver according to claim 3, characterized in that: The telescopic rod end of the clamping cylinder (8) is equipped with a clamp, and the side of the clamp that is in contact with the counterweight mechanism (6) is provided with an anti-slip groove.
9. The hammer-driven dynamic load testing pile driver according to claim 1, characterized in that: The lifting cylinder (7), clamping cylinder (8) and adjusting cylinder (42) are all connected to the hydraulic control system. The hydraulic control system can automatically adjust the extension speed and stroke of the lifting cylinder (7) and clamping cylinder (8) according to the preset hammering force and height parameters.
10. The hammer-driven dynamic load testing pile driver according to claim 5, characterized in that: The connecting frame (3) includes a rectangular connecting plate (31), two sets of longitudinal connecting brackets (32) and two sets of transverse connecting brackets (33). The hammering avoidance hole is rectangular and is opened in the middle of the rectangular connecting plate (31). The two sets of longitudinal connecting brackets (32) are symmetrically installed below the connecting plate (31) and located at the hammering avoidance hole. The two sets of transverse connecting brackets (33) are symmetrically installed below the two sets of longitudinal connecting brackets (32) and located at the hammering avoidance hole. The bottom end of the guide column (9) is connected to the middle of the longitudinal connecting bracket (32). The auxiliary support seat (4) is installed at both ends of the longitudinal connecting bracket (32). The cylinder body of the lifting cylinder (7) is installed in the middle of the transverse connecting bracket (33) through the hinge seat. The track chassis (1) is installed at both ends of the transverse connecting bracket (33).