Adjustable dewatering well point device for deep foundation pit

Abstract

This invention discloses an adjustable dewatering wellpoint device for deep foundation pits, comprising a diesel engine and a pump mounted on the same base frame. The pump is powered by the diesel engine. The device also includes a pumping mechanism, a drive mechanism, and a travel and steering mechanism. The drive mechanism and the travel and steering mechanism are respectively mounted at both ends below the base frame. The drive mechanism has an interruptible power connection with the diesel engine. The travel and steering mechanism is used to adjust the travel direction of the base frame. Both the drive mechanism and the travel and steering mechanism have large-area contact with the bottom surface of the foundation pit. This invention integrates a diesel engine-driven autonomous movement structure with an adjustable steering mechanism. The power transmission state can be flexibly switched by moving the connecting pipe up and down—when connected, the diesel engine power is transmitted to the drive wheels via a gear set and transmission shaft, enabling autonomous movement of the device; when disconnected, it can be fixed at a designated location for operation, eliminating the need for manual handling or reliance on lifting equipment.

Description

Technical Field

[0001] This invention relates to the field of deep foundation pit construction dewatering technology, specifically to an adjustable dewatering well point device for deep foundation pits. Background Technology

[0002] In various infrastructure construction projects, such as building construction and municipal engineering, deep foundation pit construction is a fundamental step, and its construction quality and safety directly determine the stability of the subsequent main structure. During the excavation of deep foundation pits, due to various factors such as geological conditions, hydrological environment, and construction technology, water accumulation is very likely to occur in the pit, becoming a key issue that restricts construction progress and threatens construction safety.

[0003] If the water accumulated in the foundation pit is not pumped out in a timely and thorough manner, it will significantly reduce the bearing capacity of the soil at the bottom of the pit, and easily cause adverse geological disasters such as water inrush, quicksand, and piping, leading to the collapse of the pit sidewalls and the heave of the foundation, which seriously threatens the safety of construction personnel and equipment. At the same time, the water will soak the construction area, hindering the subsequent foundation treatment, rebar binding, concrete pouring and other processes after the foundation pit excavation, greatly reducing construction efficiency and increasing construction costs. Therefore, timely pumping out the water in different areas of the foundation pit is an indispensable key process in the construction of deep foundation pits.

[0004] Currently, the equipment used for drainage in deep foundation pit construction is mostly traditional fixed pumps or simple dewatering devices. These types of equipment generally suffer from the prominent problem of inconvenience in movement, making them unsuitable for the drainage needs of scattered and dynamic water accumulation within the foundation pit. Specifically, existing pumps are mostly fixedly installed, or have a bulky structure and lack convenient moving mechanisms. After completing the drainage work in one area, if it needs to be moved to another water accumulation area for continued drainage, it is necessary to use large lifting equipment such as cranes and hoists, and go through a series of cumbersome procedures such as lifting, transporting, and re-fixing to complete the relocation of the pump.

[0005] This method of moving pumps by relying on lifting equipment has many drawbacks: First, the construction efficiency is extremely low. The scheduling, positioning, lifting, and re-fixing of the lifting equipment all require a lot of time and cannot respond in a timely manner to the dynamic changes in the water accumulation in the foundation pit, which can easily lead to prolonged water retention and affect the construction progress. Second, the construction cost is high. The rental and operation of lifting equipment such as cranes require a large amount of additional manpower and material resources, and the surrounding construction work needs to be suspended during the lifting operation, which further increases the construction cost.

[0006] In summary, the existing pumps and dewatering devices used in the current deep foundation pit water drainage process suffer from problems such as inconvenience in movement, reliance on lifting equipment for relocation, low construction efficiency, and high costs. These issues have become important factors restricting the construction progress and quality of deep foundation pits, and cannot meet the needs of efficient, convenient, safe, and precise water drainage in modern deep foundation pit construction. Summary of the Invention

[0007] The purpose of this invention is to provide an adjustable dewatering well point device for deep foundation pits, which aims to improve the problems of existing pumps and dewatering devices, such as inconvenience in movement, reliance on lifting equipment for relocation, low construction efficiency, and high cost.

[0008] This invention is implemented as follows:

[0009] An adjustable dewatering wellpoint device for deep foundation pits includes a diesel engine and a pump mounted on the same base frame, with the pump connected to the diesel engine for power. It also includes...

[0010] The drive mechanism and the travel steering mechanism are respectively installed at both ends below the bottom frame; the drive mechanism is connected to the diesel engine in an interruptible manner; the travel steering mechanism is used to adjust the travel direction of the bottom frame; both the drive mechanism and the travel steering mechanism have a large contact area with the bottom surface of the pit.

[0011] The liquid extraction mechanism is designed to be retractable, with one end connected to the inlet end of the pump, while the other end of the liquid extraction mechanism is stationary at a certain position in the foundation pit.

[0012] Preferably, the liquid extraction mechanism includes a liquid extraction pipe, a filter, and a connecting plate. The liquid extraction pipe is configured to be spirally telescopic. The filter and the connecting plate are respectively installed at both ends of the liquid extraction pipe. The filter is in contact with the bottom surface of the pit, and the connecting plate is connected to the pump.

[0013] Preferably, a connecting plate is sleeved at the end of the liquid extraction tube, and a through hole is provided at both ends of the connecting plate, through which an insertion rod is inserted.

[0014] Preferably, the connecting plate and the filter are located at the same end of the liquid extraction pipe, the length of the insertion rod is greater than the height of the filter, and the bottom of the insertion rod is inserted into the bottom surface of the pit to restrict the position of the filter.

[0015] Preferably, the drive mechanism includes a first coupling shaft, a first wheel body, and a second wheel body. Both ends of the first coupling shaft are connected by bearing seats and installed below the base frame. The first wheel body and the second wheel body are both installed at the ends of the first coupling shaft, and the two first wheel bodies are located between the two second wheel bodies. At the same time, the diameter of the second wheel body is larger than the diameter of the first wheel body. In addition, the second wheel body is detachably connected to the first coupling shaft.

[0016] Preferably, the first wheel body is configured as a wide wheel body structure, and multiple conical protrusions are evenly installed on the outer side surface of the first wheel body.

[0017] Preferably, the drive mechanism further includes a power transmission assembly, which includes a frame, a drive shaft that passes through the upper and lower ends of the frame via bearings, and second gears respectively mounted on the two drive shafts at opposite ends; a first gear is provided on both the first coupling shaft and the power output shaft of the diesel engine, and the first gear meshes with the second gear.

[0018] Preferably, a quincunx groove is provided on the side wall of each of the two drive shafts at one end close to each other, and the height of the quincunx groove of the lower drive shaft is greater than the height of the quincunx groove of the upper drive shaft; the power transmission assembly also includes a connecting pipe, the inner side of which is provided with a quincunx hole, and the connecting pipe is sleeved on the lower drive shaft, and the connecting pipe can also be sleeved on the upper drive shaft.

[0019] Preferably, at least one channel is provided on the lower drive shaft, and the channel is located at the top of the drive shaft; a bolt is provided through the connecting pipe, and the bolt can pass through the channel, while the top of the connecting pipe is sleeved on the upper drive shaft.

[0020] Preferably, the walking and steering mechanism includes a second coupling shaft, a first wheel body and a second wheel body installed at both ends of the second coupling shaft; a top plate is provided above the second coupling shaft via a bearing seat, and a shaft body in the middle of the top plate is provided through a fixed frame via a bearing connection, the fixed frame being connected to the bottom frame; a gearbox is connected to the top of the shaft body on the top plate, and a rotating wheel is installed on the power input shaft of the gearbox.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] 1. Addressing the core pain points of traditional deep foundation pit dewatering devices—namely, their fixed and immovable nature, reliance on cranes for relocation, cumbersome procedures, and extremely low construction efficiency—this device integrates a diesel engine-driven autonomous movement structure and an adjustable steering mechanism. By moving the connecting pipe up and down, the power transmission state can be flexibly switched: when connected, the diesel engine power is transmitted to the drive wheels via gear sets and drive shafts, enabling autonomous movement; when disconnected, it can be fixed at a designated location, eliminating the need for manual handling or reliance on cranes. The travel and steering mechanism adjusts the wheel direction via rotating wheels, flexibly adapting to complex layouts within deep foundation pits and enabling rapid relocation to different water accumulation points. This reduces the relocation time to a single point, effectively solving the problem of low efficiency in pumping out scattered water accumulation in foundation pits, and meeting the needs of large-scale deep foundation pit construction.

[0023] 2. This design addresses the shortcomings of traditional dewatering wellpoint pumping pipes, which have fixed lengths, cannot adapt to varying water depths, and are prone to filter displacement due to water flow impact. It employs a spiral telescopic pumping pipe, whose length can be flexibly adjusted according to the depth and location of the water layer in the pit. This eliminates the need to replace the pumping pipe, covering pumping needs at different depths. A connecting plate at the end of the pumping pipe works in conjunction with a rod; the rod is inserted into the bottom of the pit to firmly fix the filter in place, preventing displacement or tilting during pumping and ensuring the filter remains in close contact with the water-affected area. Simultaneously, the filter intercepts impurities such as silt and sand in the water, preventing them from entering the pump and further ensuring pumping stability. This design is suitable for pumping water from deep pits with varying depths and distributions. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the structure of the diesel engine, pump, drive mechanism, and travel steering mechanism of the present invention;

[0026] Figure 3 This is a schematic diagram of the liquid extraction mechanism of the present invention;

[0027] Figure 4 This is a partial structural schematic diagram of the liquid extraction mechanism of the present invention;

[0028] Figure 5 This is a schematic diagram of the drive mechanism of the present invention;

[0029] Figure 6 This is a first structural schematic diagram of the power transmission mechanism of the present invention;

[0030] Figure 7 This is a schematic diagram of the second structure of the power transmission mechanism of the present invention;

[0031] Figure 8 This is a schematic diagram of the walking and steering mechanism of the present invention.

[0032] In the picture:

[0033] 1. Diesel engine; 2. Pump; 3. Liquid extraction mechanism; 31. Liquid extraction pipe; 32. Filter; 33. Connecting plate; 34. Connecting plate; 35. Perforation; 36. Insert rod; 4. Drive mechanism; 41. First coupling; 42. First gear; 43. Conical protrusion; 44. First wheel body; 45. Second wheel body; 5. Travel and steering mechanism; 51. Second coupling; 52. Top plate; 53. Fixing frame; 54. Rotating wheel; 55. Gearbox; 6. Power transmission assembly; 61. Frame; 62. Connecting pipe; 63. Drive shaft; 64. Second gear; 65. Plum blossom hole; 66. Plum blossom groove. Detailed Implementation

[0034] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] The following description, in conjunction with the accompanying drawings and specific embodiments, provides further details:

[0036] This embodiment details the assembly process of the adjustable dewatering wellpoint device for deep foundation pits, ensuring that all components are securely connected, flexible in movement, and efficient in pumping, thus solving the problems of traditional dewatering devices being inconvenient to move, reliant on lifting equipment, and having low construction efficiency.

[0037] In this application, when assembling the base frame and the power components, the base frame is made of welded steel to ensure that the structural strength is suitable for the foundation pit construction environment; the diesel engine 1 and the pump 2 are fixed to the base frame with bolts so that the power output end of the pump 2 and the diesel engine 1 are directly connected to ensure stable power transmission; the installation interfaces of the drive mechanism 4 and the walking and steering mechanism 5 are reserved at both ends below the base frame to ensure accurate assembly of subsequent components.

[0038] Reference Figure 5-7 In this application, during the assembly of the drive mechanism, the core power drive and movement structure is assembled as follows: Assemble the wheel assembly: Select the first connecting shaft 41 and horizontally install it at one end below the bottom frame via a bearing seat; install the first wheel body 44 and the second wheel body 45 sequentially at both ends of the first connecting shaft 41, ensuring that the two first wheel bodies 44 are located between the two second wheel bodies 45, and that the diameter of the second wheel body 45 is larger than that of the first wheel body 44 to adapt to different pit terrains. This arrangement facilitates the removal of the second wheel body 45 before the device is placed in the pit, thereby allowing the first wheel body 44 to make contact with a larger area of ​​the pit bottom surface, providing convenience for the device to move; after the device leaves the pit, the second wheel body 45 is then installed on the first connecting shaft 41, facilitating the device to move to the corresponding position; the second wheel body 45 and the first connecting shaft 41 are fixed with detachable connecting bolts, facilitating subsequent replacement and maintenance; the first wheel body 44 adopts a wide wheel structure, with multiple tapered protrusions 43 evenly welded on the outer side to increase the friction with the pit bottom surface and increase the contact area between the device and the pit.

[0039] Install the power transmission assembly 6: Select a frame 61 and fix it on the base frame. Connect two drive shafts 63 through the upper and lower ends of the frame 61 via bearings. Install a second gear 64 at the ends of the two drive shafts 63 that are far apart from each other. Install a first gear 42 on the first connecting shaft 41 and the power output shaft of the diesel engine 1, respectively, to ensure that the first gear 42 meshes with the corresponding second gear 64. Machining a perforated groove 66 at the ends of the two drive shafts 63 that are close to each other, with the height of the perforated groove on the lower drive shaft 63 being greater than that on the upper drive shaft. Sleeve a connecting pipe 62 with perforated holes 65 on the inner side onto the lower drive shaft 63. A channel is opened at the top of the lower drive shaft 63, or a channel can be set at other positions on the lower drive shaft 63. Insert a bolt through the connecting pipe 62, and the bolt can be inserted into the top channel for fixation. At this time, the top of the connecting pipe 62 can be sleeved onto the upper drive shaft 63 to realize the interruption or connection of power transmission.

[0040] Reference Figure 8 In this application, during the assembly of the walking and steering mechanism, the assembly direction adjustment and auxiliary movement structure are as follows:

[0041] Assemble the wheel body and steering assembly: Select the second connecting shaft 51, and install the first wheel body 44 and the second wheel body 45, which are consistent with the drive mechanism, at both ends; fix the top plate 52 above the second connecting shaft 51 through the bearing seat, and the shaft body in the middle of the top plate 52 passes through the fixing frame 53 through the bearing. The fixing frame 53 is bolted to the bottom frame; install the gearbox 55 on the top of the shaft body of the top plate 52, and install the rotating wheel 54 on the power input shaft of the gearbox 55. Rotating the rotating wheel 54 can adjust the steering of the top plate 52 and the second connecting shaft 51 through the gearbox, thereby adjusting the walking direction of the device.

[0042] Reference Figure 3-4 When assembling the liquid extraction mechanism, the retractable extraction and filtration structure is assembled as follows:

[0043] Assemble the pumping assembly: Select a spiral telescopic pumping pipe 31, install a filter 32 at one end, and a connecting plate 33 at the other end. The connecting plate 33 is bolted to the inlet end of the pump 2. Install a connecting plate 34 at the end of the pumping pipe 31 near the filter 32. Through holes 35 are opened at both ends of the connecting plate 34 to insert a rod 36. The length of the rod 36 is greater than the height of the filter 32, ensuring that its bottom can be inserted into the bottom of the pit. When the pump 2 is working to pump water, install a pipe body at the output end of the pump 2 to discharge water from the pit.

[0044] Overall integration and debugging

[0045] Functional verification: The wheels of the propulsion device and the walking and steering mechanism roll smoothly, and the walking direction can be flexibly adjusted by rotating the wheel 54; the connecting pipe 62 is moved up and fitted onto the upper drive shaft 63, and the bolts are tightened to fix it. The diesel engine 1 is started, and the power is transmitted to the drive wheel through the gear set, drive shaft, and first coupling. The device can move autonomously. The power is interrupted when the connecting pipe is disconnected, and it can be fixed for operation; the liquid extraction pipe 31 can be freely extended and retracted, and the insertion rod 36 can stably restrict the position of the filter 32 after being inserted into the bottom of the pit; the pump 2 is started, and the liquid extraction mechanism can extract and discharge normally. There is no leakage at any connection, and the overall assembly is completed.

[0046] Application Examples of Deep Foundation Pit Dewatering

[0047] This embodiment, based on the assembled equipment and combined with the scenario of decentralized water drainage in deep foundation pits of building engineering, explains the usage process of the device and solves the pain points of traditional dewatering devices, such as inconvenience in movement, reliance on lifting equipment, and low construction efficiency.

[0048] Pre-construction preparation

[0049] Equipment inspection: It was confirmed that the diesel engine 1 and pump 2 were operating normally, and there was no jamming in the wheels and gears of the drive mechanism and the walking and steering mechanism; the liquid extraction pipe 31 was flexible in extension and retraction, the filter 32 was not blocked, and the insertion rod 36 was intact; the connecting pipe 62 was in the disconnected state and the upper drive shaft was not fitted on it, and the device could be manually pushed to adjust the initial position.

[0050] On-site adaptation: Based on the distribution of water accumulation in the deep foundation pit, determine the first pumping point, push the device to that position, ensure that the filter 32 is facing the water accumulation area, and step on the wheel brake if temporary fixing is configured.

[0051] Initial sampling operation

[0052] Fixed pumping mechanism: stretch the spiral pumping pipe 31 to make the filter 32 fit against the bottom surface of the water accumulation pit; insert the rods 36 at both ends of the connecting plate 34 vertically into the bottom surface of the pit to limit the displacement of the filter 32 and prevent it from shifting due to water flow impact during pumping.

[0053] Start pumping: Start the diesel engine 1 to drive the pump 2 to run. The filter 32 intercepts impurities such as mud and sand in the water. The accumulated water is pumped out by the pump through the suction pipe 31 and discharged outside the pit. During the pumping process, the coverage of the filter 32 can be finely adjusted by extending and retracting the suction pipe 31 to improve the pumping efficiency.

[0054] Rapid transfer of drainage area

[0055] Interruption of pumping and unlocking: Pull out the plug rod 36, retract the pumping tube 31 to detach the filter 32 from the bottom surface; release the wheel brake, if the transfer distance is far, move the connecting tube 62 up and put it on the upper drive shaft 63, tighten the bolts to fix it, and drive the wheel to move by the power of the diesel engine 1 without relying on lifting equipment.

[0056] Steering and positioning: Rotate the wheel 54 of the walking steering mechanism, adjust the top plate 52 through the gearbox 55 to change the direction of travel of the device, and accurately drive to the next water accumulation area; after reaching the target position, disconnect the connecting pipe 62, loosen the bolt and move it down, interrupt the power transmission, push the device to fine-tune to the best pumping position, and repeat the initial pumping fixing and starting steps.

[0057] Complex terrain adaptation and maintenance

[0058] Terrain adaptability: If the bottom of the pit is uneven or muddy, the second wheel 45 can be removed, leaving only the first wheel 44. The wide wheel structure and conical protrusion 43 can increase the ground contact area and friction, preventing the device from slipping. If it is necessary to cross a shallow ditch, the second wheel 45 can be reinstalled to improve passability by utilizing its large diameter.

[0059] Temporary maintenance: If filter 32 becomes clogged during the pumping process, turn off the pump, pull out the plunger, retract the suction pipe to remove the filter, clean the impurities, and reinstall it. There is no need to move the entire device. When the diesel engine 1 is low on fuel, the device can be pushed directly to the edge of the pit for refueling. The operation is convenient.

[0060] Effect verification

[0061] Convenience of movement: The device can be moved manually or by diesel engine power, and it is flexible in steering. It does not require lifting equipment such as cranes, and it takes less time to move a single pumping area. It is more efficient than traditional fixed equipment and completely solves the core pain point of inconvenience of movement.

[0062] High efficiency of pumping: The spiral telescopic pumping pipe is suitable for water accumulation areas of different distances, and the fixed rod ensures the stability of the filter. The filter avoids pump blockage and the pumping flow is stable. It is suitable for the decentralized and dynamic water accumulation pumping needs of deep foundation pits, which greatly reduces the water retention time, ensures the construction progress, reduces the risk of collapse caused by water accumulation, and reduces the cost of lifting equipment rental and labor input.

[0063] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A deep foundation pit adjustable dewatering well point device, comprising a diesel engine (1) and a pump (2) mounted on the same base frame, wherein the pump (2) is powered by the diesel engine (1), characterized in that, Also includes: The drive mechanism (4) and the travel steering mechanism (5) are respectively installed at both ends below the bottom frame; the drive mechanism (4) is connected to the diesel engine (1) in an interruptible power connection; the travel steering mechanism (5) is used to adjust the travel direction of the bottom frame; both the drive mechanism (4) and the travel steering mechanism (5) are in large-area contact with the bottom surface of the pit. The liquid extraction mechanism (3) is configured as a telescopic structure, with one end connected to the liquid inlet of the pump (2), while the other end of the liquid extraction mechanism (3) is placed at a certain position in the pit.

2. The adjustable dewatering well point device for deep foundation pits according to claim 1, characterized in that, The liquid extraction mechanism (3) includes a liquid extraction pipe (31), a filter (32) and a connecting plate (33). The liquid extraction pipe (31) is spirally telescopic. The filter (32) and the connecting plate (33) are respectively installed at both ends of the liquid extraction pipe (31). The filter (32) is in contact with the bottom surface of the pit. The connecting plate (33) is connected to the pump (2).

3. The adjustable dewatering well point device for deep foundation pits according to claim 2, characterized in that, A connecting plate (34) is sleeved at the end of the liquid extraction tube (31), and a through hole (35) is provided at both ends of the connecting plate (34), and an insertion rod (36) is inserted through the through hole (35).

4. The adjustable dewatering well point device for deep foundation pits according to claim 3, characterized in that, The connecting plate (34) and the filter (32) are located at the same end of the liquid extraction pipe (31). The length of the insertion rod (36) is greater than the height of the filter (32). The bottom of the insertion rod (36) is inserted into the bottom surface of the pit to restrict the position of the filter (32).

5. The adjustable dewatering well point device for deep foundation pits according to claim 1, characterized in that, The drive mechanism (4) includes a first connecting shaft (41), a first wheel body (44), and a second wheel body (45). Both ends of the first connecting shaft (41) are connected by bearing seats and installed below the bottom frame. The first wheel body (44) and the second wheel body (45) are both installed at the ends of the first connecting shaft (41), and the two first wheel bodies (44) are located between the two second wheel bodies (45). At the same time, the diameter of the second wheel body (45) is larger than the diameter of the first wheel body (44). In addition, the second wheel body (45) is detachably connected to the first connecting shaft (41).

6. The adjustable dewatering well point device for deep foundation pits according to claim 5, characterized in that, The first wheel body (44) is configured as a wide wheel body structure, and multiple conical protrusions (43) are evenly installed on the outer side surface of the first wheel body (44).

7. The adjustable dewatering well point device for deep foundation pits according to claim 5, characterized in that, The drive mechanism (4) further includes a power transmission assembly (6), which includes a frame (61), a drive shaft (63) that passes through the upper and lower ends of the frame (61) via bearings, and a second gear (64) that is installed on the two drive shafts (63) at opposite ends; a first gear (42) is provided on the first connecting shaft (41) and the power output shaft of the diesel engine (1), and the first gear (42) meshes with the second gear (64).

8. The adjustable dewatering well point device for deep foundation pits according to claim 7, characterized in that, Both drive shafts (63) have a quincunx groove (66) on their sidewalls at their respective ends. The height of the quincunx groove (66) on the lower drive shaft (63) is greater than that on the upper drive shaft (63). The power transmission assembly (6) also includes a connecting pipe (62). The inner side of the connecting pipe (62) is provided with a quincunx hole (65). The connecting pipe (62) is sleeved on the lower drive shaft (63) and can also be sleeved on the upper drive shaft (63).

9. The adjustable dewatering well point device for deep foundation pits according to claim 8, characterized in that, At least one channel is provided on the lower drive shaft (63), the channel being set at the top of the drive shaft (63); a bolt is provided through the connecting pipe (62), the bolt being able to pass through the channel, and the top of the connecting pipe (62) is sleeved on the upper drive shaft (63).

10. The adjustable dewatering well point device for deep foundation pits according to claim 5, characterized in that, The walking and steering mechanism (5) includes a second connecting shaft (51), a first wheel body (44) and a second wheel body (45) installed at both ends of the second connecting shaft (51); a top plate (52) is provided above the second connecting shaft (51) by a bearing seat, and the shaft body in the middle of the top plate (52) is connected through a fixed frame (53) by a bearing, and the fixed frame (53) is connected to the bottom frame; a gearbox (55) is connected to the top of the shaft body of the top plate (52), and a rotating wheel (54) is installed on the power input shaft of the gearbox (55).

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