Multifunctional tractor capable of realizing heavy object hoisting

Abstract

The invention relates to a multifunctional tractor capable of hoisting heavy objects, and belongs to the technical field of tractors, the multifunctional tractor comprises a tractor body, a positioning column, a bearing plate and a lifting assembly are arranged on the tractor body, the positioning column is vertically fixed on the tractor body and penetrates through the bearing plate, and the bearing plate is flatly laid on the tractor body and is connected with the positioning column in an inserted mode; a splicing clamping piece used for detachably connecting the bearing plate and the vehicle body is arranged between the bearing plate and the vehicle body, and the lifting assembly is fixed to the bearing plate; the lifting assembly is used for lifting and lowering goods. The multifunctional tractor has the effects that the tractor can be matched with a user to carry heavy objects, and the multifunctionality of the tractor is improved.

Description

Technical Field

[0001] This application relates to the technical field of tractor vehicles, and in particular to a multi-functional tractor vehicle capable of lifting heavy objects. Background Technology

[0002] Currently, towing vehicles are one of the core pieces of equipment for airport ground support, specifically designed to tow and push aircraft on the apron or taxiway, helping them to accurately park at their designated positions or enter and exit maintenance hangars. Despite their small size, they possess extremely strong traction, easily pulling commercial airliners weighing tens or even hundreds of tons, making them a crucial tool for ensuring efficient airport ground operations.

[0003] The existing towing vehicle includes a body, a running system, a power system, and a tow bar. The tow bar is rotatably connected to the front of the body, making it easy for the user to hold and control the direction. The running system is equipped with large-diameter solid rubber wheels, and some heavy-duty models use multi-wheel drive, providing extremely strong grip and load-bearing capacity to prevent slipping on slippery tarmacs. The power system mostly uses high-torque diesel engines or pure electric drive, combined with a hydraulic transmission system, which can output huge traction force at low speeds, easily propelling aircraft weighing hundreds of tons.

[0004] The existing towing vehicles used at airports not only need to tow small aircraft, but also to drag suitcases or other heavy cargo. However, the towing vehicles only have the function of carrying loads and do not have the function of assisting in the handling of goods, which is a deficiency of single function. Summary of the Invention

[0005] In order to enable the tractor to cooperate with the user in moving heavy objects and improve the versatility of the tractor, this application provides a multi-functional tractor that can lift heavy objects.

[0006] The multi-functional tractor unit capable of lifting heavy objects provided in this application adopts the following technical solution: A multi-functional tractor capable of lifting heavy objects includes a vehicle body with a positioning column, a load-bearing plate, and a lifting assembly. The positioning column is vertically fixed to the vehicle body and penetrates the load-bearing plate. The load-bearing plate is laid flat on the vehicle body and inserted into the positioning column. A splicing clip is provided between the load-bearing plate and the vehicle body for detachable connection. The lifting assembly is fixed to the load-bearing plate. The lifting assembly includes a bucket, a boom, a forearm, a hydraulic cylinder, a column, and a base. The base is fixed to the load-bearing plate, and the column is fixed to the base. One end of the boom is rotatably connected to the column, and the other end is rotatably connected to the outer wall of the bucket. One end of the forearm is rotatably connected to the column, and the other end is rotatably connected to the outer wall of the bucket. The rotatable connections of the boom and forearm to the outer wall of the bucket are located on the same side wall, and the rotation axes are both horizontally set. The bottom end of the hydraulic cylinder is hinged to the base, and the piston end of the hydraulic cylinder is hinged to the boom. The forearm includes a telescopic section and a fixed section, with the telescopic section located near the bucket.

[0007] By adopting the above technical solution, a load-bearing plate and an integrated lifting assembly are installed on the tractor unit. The lifting assembly uses a four-link structure driven by hydraulic cylinders through a boom and forearm, and is equipped with a bucket. This allows the tractor unit to retain its core traction function while possessing lifting and transporting capabilities similar to a small excavator or loader. This robust structure can output a large lifting force and can be used for hoisting and transporting airport baggage containers, bulk heavy cargo, or equipment. It effectively solves the problem of the traditional tractor unit's single function and significantly improves its multi-functionality and the overall efficiency of airport ground support operations.

[0008] Optionally, the telescopic section includes an inner tube and an outer tube. One end of the outer tube is fixed to one end of the fixed section, and one end of the inner tube is slidably inserted into the inside of the outer tube, while the other end is rotatably connected to the outer wall of the bucket. An electric cylinder is fixed on the outer wall of the outer tube, and the piston end of the electric cylinder is fixedly connected to the outer wall of the inner tube. The piston movement direction of the electric cylinder is set in accordance with the length direction of the telescopic section.

[0009] By adopting the above technical solution, the boom adopts a telescopic structure driven by an electric cylinder. The operator can precisely control the length of the boom, thereby flexibly adjusting the attitude of the bucket within a limited angle, so that the bucket can be hooked inward toward the boom or swung downward away from the boom.

[0010] Optionally, the column includes a column body, a first gantry and a second gantry. The bottom end of the column body is fixed to the base. The first gantry is fixedly connected to the side wall of the column body. The bottom end of the second gantry is rotatably connected to the first gantry. The top end of the second gantry is rotatably connected to the end of the fixed section away from the telescopic section. The rotatable connection between the upper arm and the column is located on the first gantry. A screw is provided between the top end of the first gantry and the top end of the second gantry for adjusting the included angle between them.

[0011] By adopting the above technical solution, the column uses a composite structure consisting of a column body and two gantry frames. The tilt angle of the second gantry frame is adjusted by a screw, thereby changing the installation angle of the boom base. This allows the working plane and posture of the entire lifting mechanism to be adjusted within a certain range, i.e., the posture of the bucket, to adapt to lifting tasks at different heights and angles, further enhancing the lifting system's adaptability to complex working scenarios.

[0012] Optionally, the splicing clip includes a clip plate, a left clip, a right clip, a cylinder, and a spring. The clip plate has a slot, and the edges of the vehicle body and the support plate are tightly inserted into the slot. The cylinder is fixed to the top of the clip plate. The left and right clips are distributed on both sides of the cylinder and are rotatably connected to the cylinder. The spring is located between the left and right clips on one side of the cylinder, with one end of the spring fixed to the left clip and the other end fixed to the right clip. Ratchets are fixed on the sidewalls of the left and right clips, and the ratchet is located on the side of the cylinder away from the spring. The horizontal cross-section of the positioning post is triangular to cooperate with the ratchet to achieve one-way locking when the splicing clip slides horizontally relative to the positioning post.

[0013] By adopting the above technical solution, and utilizing the cooperation of the left and right ratchet-equipped locking strips with the triangular cross-section positioning post, the splicing fastener is quickly installed and unidirectionally locked onto the vehicle body positioning post. During installation, simply align the support plate with the positioning post and lower it, then push the splicing fastener horizontally to automatically lock it in place; during disassembly, the two locking strips must be separated by overcoming the spring force. This structure is simple and reliable, achieving a stable and detachable connection between the support plate and the vehicle body, facilitating the rapid installation and removal of lifting functional modules. Optionally, the card plate has a notch located at the top of the card plate with the opening facing the positioning post, and the splicing card covers the notch.

[0014] By adopting the above technical solution, the notch on the card plate provides clear guidance and accommodation space for the positioning post. During installation, the edges of the vehicle body and the support plate are first inserted into the slot, and then the card plate is pushed to make the positioning post slide into the notch. The card plate slides along the direction close to the positioning post until the positioning post slides into the notch. At this time, the edge of the support plate is also located in the slot and its top abuts against the top of the slot. The ratchet and the positioning post achieve one-way limiting, preventing the splicing parts from sliding away from the positioning post.

[0015] Optionally, an auxiliary locking mechanism is provided between the card plate and the vehicle body. The auxiliary locking mechanism includes a movable part and a fixed part. The fixed part is fixed to the bottom of the vehicle body, and the movable part is fixed to the card plate. The combination or separation of the fixed part and the movable part is used to control the locking or unlocking of the card plate and the vehicle body.

[0016] By adopting the above technical solution, an auxiliary locking mechanism is added between the pallet and the vehicle body, providing a second layer of protection for the connection of the load-bearing plate. Even if the main locking of the splicing clamp fails unexpectedly, this mechanism can prevent the load-bearing plate from detaching from the vehicle body, greatly improving the safety and reliability of the entire lifting system under high load and high risk operations.

[0017] Optionally, the movable part includes a housing, a protrusion, a hemisphere, a lever, and an elastic element. The housing is hollow inside. The protrusion is fixed to one end of the housing and fits the housing in an L-shape. A through hole is opened on the end face of the housing where the protrusion is located. The through hole is set close to the edge of the protrusion. An extension plate is fixed to the edge of the protrusion adjacent to the through hole. The extension plate is located inside the housing. A hemispherical rotating cavity is set at the junction of the extension plate and the protrusion. The hemisphere is rotatably set in the rotating cavity. One end of the lever is fixed to the arc surface of the hemisphere. The other end passes through the rotating cavity and the housing and is located outside the housing. Both the rotating cavity and the housing are provided with a way to facilitate the movement of the lever at the point where the lever passes through. The movable part has a clearance hole; the lever swings towards or away from the protrusion, one end of the elastic element is fixed to the inner wall of the housing, and the other end is fixed to the lever. The elastic element is used to pull the lever to swing away from the protrusion; the fixed part has the same structure as the movable part and the two are arranged in a centrally symmetrical manner. The housing of the movable part is fixed to the bottom of the card plate, and the housing of the fixed part is fixed to the bottom of the vehicle body; when the card plate is locked to the vehicle body, the protrusion of the fixed part passes through the through hole of the movable part and is inserted into the housing of the movable part. The hemisphere of the fixed part and the hemisphere of the movable part abut and are spliced ​​to form a complete sphere, and the joint between the two is misaligned with the joint between the two rotating cavities.

[0018] By adopting the above technical solution, the auxiliary locking mechanism uses a symmetrically designed moving and fixed part, achieving interlocking through the concentric abutment and staggered joint of two hemispheres. Unlocking is easily achieved by moving the lever, and the elastic element automatically resets and locks the mechanism after release. This ingenious mechanism is easy to operate, provides a stable and reliable locked state, and can effectively withstand forces from all directions, offering a high-strength and high-safety mechanical interlock guarantee for detachable connections.

[0019] Optionally, the end of the protrusion facing away from the housing is cone-shaped.

[0020] By adopting the above technical solution, the end of the protrusion is designed as a pointed cone, so that when the moving part and the fixed part are docked, the pointed cone first slides against the plane of the hemisphere. The pointed cone can play a guiding role. When the protrusion is inserted into the through hole of the other, the planes of the two hemispheres approach each other and slide against each other, and the two hemispheres are put together to form a complete sphere, thus optimizing the docking operation.

[0021] Optionally, the elastic element is a tension spring.

[0022] By adopting the above technical solution and using a tension spring as the elastic element, the structure is simple and the performance is reliable. The tension spring always applies a pulling force to the lever, causing it to swing away from the direction of the protrusion (i.e., tending towards the locked position), ensuring that the auxiliary locking mechanism can automatically maintain a reliable locked state without human intervention, and avoiding accidental unlocking due to vibration or other reasons.

[0023] In summary, this application includes at least one of the following beneficial technical effects: By modularly integrating a hydraulically driven lifting assembly into the tractor unit, traditional tractors retain their core traction function while gaining independent lifting, transporting, and hoisting capabilities. This effectively solves the problem of limited functionality for airport ground support equipment, achieving "one vehicle for multiple uses" and significantly improving equipment utilization and operational efficiency. By using triangular positioning posts and ratchet-equipped splicing clips, combined with a unique auxiliary locking mechanism, a stable, reliable, and quick-to-disassemble connection is achieved between the load-bearing plate and the entire lifting module and the vehicle body. This design ensures safety during heavy-duty operations and allows for quick removal of the module when the lifting function is not needed, restoring the tractor to its original state and mobility. The lifting assembly employs a four-bar linkage structure with telescopic boom and adjustable gantry angle, allowing for flexible adjustment of the bucket's working range, height, and posture over a wide range. This enhances the equipment's adaptability to different sized cargoes and different operating positions (such as under the fuselage or at the cargo hatch) in complex apron environments, improving the accuracy and convenience of handling operations. Attached Figure Description

[0024] Figure 1 This is a structural schematic diagram of an embodiment of this application; Figure 2 yes Figure 1 A magnified view of part A in the middle; Figure 3 yes Figure 1 A magnified view of part B in the middle section; Figure 4 This is a partial structural diagram of the location of the auxiliary locking mechanism; Figure 5 This is a cross-sectional view of the internal structure of the auxiliary locking mechanism; Figure 6 This is a schematic diagram illustrating the use of the auxiliary locking mechanism.

[0025] In the diagram, 1. Body; 11. Positioning post; 12. Load-bearing plate; 2. Lifting assembly; 21. Bucket; 22. Boom; 23. Arm; 231. Inner tube; 232. Outer tube; 233. Electric cylinder; 24. Hydraulic cylinder; 25. Column; 251. First mast; 252. Second mast; 26. Base; 3. Splicing fastener; 31. Clamping plate; 311. Clamping slot; 312. Notch; 32. Left clamping bar; 33. Right clamping bar; 34. Cylinder; 35. Spring; 4. Screw; 5. Ratchet; 6. Auxiliary locking mechanism; 61. Moving part; 611. Housing; 612. Protrusion; 613. Hemisphere; 614. Lever; 615. Elastic element; 62. Fixing part; 7. Through hole; 8. Extension plate; 81. Rotating cavity; 82. Clearance strip hole. Detailed Implementation

[0026] The following is in conjunction with the appendix Figures 1-6 This application will be described in further detail.

[0027] This application discloses a multi-functional tractor vehicle capable of lifting heavy objects.

[0028] refer to Figure 1 and Figure 3 A multi-functional tractor capable of lifting heavy objects includes a vehicle body 1. Several vertically arranged positioning posts 11 are fixed to the vehicle body 1, each with a triangular horizontal cross-section. A support plate 12 is provided on the vehicle body 1, and the support plate 12 is fitted onto the positioning posts 11 through corresponding holes, lying flat on the vehicle body 1. The support plate 12 and the vehicle body 1 are detachably fixedly connected by multiple splicing fasteners 3. A lifting assembly 2 is installed on the support plate 12.

[0029] refer to Figure 1 and Figure 3 The lifting assembly 2 includes a base 26, a column 25, a boom 22, a forearm 23, a hydraulic cylinder 24, and a bucket 21. The base 26 is fixed to the support plate 12. The lower end of the column 25 is fixed to the base 26. Specifically, the column 25 includes a column body, a first mast 251, and a second mast 252. The first mast 251 is fixed to one side of the column body. The lower end of the second mast 252 is rotatably connected to the lower end of the first mast 251 via a hinge shaft. A screw 4 is connected between the top of the first mast 251 and the top of the second mast 252. One end of the screw 4 is fixedly connected to the top of the second mast 252, and the other end passes through the top of the first mast 251. Two nuts are threaded onto the screw 4, and the two nuts are distributed on both sides of the first mast 251. By turning the nuts, the included angle between the first mast 251 and the second mast 252 can be changed, thereby adjusting the tilt angle of the second mast 252.

[0030] refer to Figure 1 and Figure 2 One end of the boom 22 is hinged to the bottom end of the first gantry 251, i.e., rotatably connected. The forearm 23 consists of a fixed section and a telescopic section. The end of the fixed section is rotatably connected to the top of the second gantry 252, so when the angle of the second gantry 252 is adjusted, the base angle of the forearm 23 also changes. The telescopic section is located at the end of the forearm 23 near the bucket 21. Specifically, the telescopic section includes an outer tube 232 and an inner tube 231. One end of the outer tube 232 is fixedly connected to the fixed section, and the inner tube 231 is slidably inserted into the outer tube 232. An electric cylinder 233 is installed on the outer tube 232. The piston rod of the electric cylinder 233 is connected to the outer wall of the inner tube 231. By controlling the extension and retraction of the electric cylinder 233, the inner tube 231 can be driven to extend or retract, thereby changing the effective length of the forearm 23.

[0031] refer to Figure 1 and Figure 2The bucket 21 is connected to the free end of the boom 22 and the free end of the inner tube 231 via two hinge points, respectively. These two hinge points are located on the same side wall of the bucket 21, and their rotation axes are both horizontally set. The bottom end of the hydraulic cylinder 24 is hinged to the base 26, and the end of its piston rod is hinged to the boom 22. By driving the hydraulic cylinder 24 to extend or retract, the boom 22 can be controlled to rotate around its hinge point with the first mast 251, thereby realizing the lifting and lowering action of the bucket 21. By adjusting the length of the boom 23 via the electric cylinder 233, the posture of the bucket 21 (such as inward hooking or outward swinging) can be further fine-tuned during this process.

[0032] refer to Figure 1 and Figure 3 The splicing fastener 3 includes a fastener plate 31. A slot 311 is formed inwardly on the side of the fastener plate 31. A notch 312 is formed on the top surface of the fastener plate 31, the opening direction of which is perpendicular to the extension direction of the slot 311 and faces the positioning post 11. During installation, first align the edges of the support plate 12 and place it on the corresponding edge of the vehicle body 1. Then, the slot 311 of the fastener plate 31 is inserted into the edge of the vehicle body 1 and the edge of the support plate 12. Next, the fastener plate 31 is pushed horizontally along the direction close to the positioning post 11, causing the edge of the positioning post 11 to slide into the notch 312. At this point, the edge of the support plate 12 is fully inserted into the slot 311, and its top surface abuts against the top inner wall of the slot 311.

[0033] refer to Figure 1 and Figure 3 A vertical cylinder 34 is fixed to the top of the clamping plate 31. A left clamping strip 32 and a right clamping strip 33 are rotatably connected to both sides of the cylinder 34. A spring 35 connects the left clamping strip 32 and the right clamping strip 33 on one side of the cylinder 34, with both ends of the spring 35 fixed to the two clamping strips respectively. A ratchet 5 is fixed near the free end of the left clamping strip 32 and the right clamping strip 33 on their opposite inner surfaces. The ratchet 5 and the spring 35 are distributed on both sides of the cylinder 34. When the clamping plate 31 is pushed towards the positioning post 11, causing the positioning post 11 to enter the notch 312, the inclined surface of the triangular cross-section positioning post 11 will open the ends of the left clamping strip 32 and the right clamping strip 33, further compressing the spring 35. When the ratchet 5 passes the widest edge of the positioning post 11, under the restoring force of the spring 35, the two ratchet 5 will be locked on the plane on the other side of the positioning post 11, forming a one-way lock, preventing the locking plate 31 from sliding away from the positioning post 11, thereby firmly locking the bearing plate 12 to the vehicle body 1.

[0034] refer to Figure 1 and Figure 4To provide double protection, an auxiliary locking mechanism 6 is provided between the bottom surface of the card plate 31 and the bottom surface of the vehicle body 1. The auxiliary locking mechanism 6 consists of a movable part 61 and a fixed part 62 with identical structures and arranged centrally symmetrically. The housing 611 of the movable part 61 is fixed to the bottom of the card plate 31, and the housing of the fixed part 62 is fixed to the bottom of the vehicle body 1.

[0035] refer to Figure 4 , Figure 5 and Figure 6 Taking the movable part 61 as an example, the movable part 61 includes a housing 611, a protrusion 612, a hemisphere 613, a lever 614, and an elastic element 615. The protrusion 612 is fixed at one end of the housing 611. The housing 611 and the protrusion 612 together form an L-shape. On the end face of the housing 611 where the protrusion 612 is located, a through hole 7 is opened adjacent to the protrusion 612. The edge of the protrusion 612 facing the through hole 7 extends into the housing 611 to form an extension plate 8. At the junction of the extension plate 8 and the protrusion 612, a hemispherical rotating cavity 81 is machined. The hemisphere 613 is rotatably disposed in the rotating cavity 81. One end of the lever 614 is fixed to the arc surface of the hemisphere 613, and the other end passes through the clearance slots 82 on the wall of the rotating cavity 81 and the side wall of the housing 611 before extending to the outside of the housing 611. That is, the cavity wall of the rotating cavity 81 and the housing 611 where the lever 614 passes through are both provided with elongated clearance slots 82, allowing the lever 614 to swing within a certain angle. A tension spring 615, which acts as an elastic element, is fixed at one end to the inner wall of the housing 611 and at the other end to the lever 614. Its tension always causes the lever 614 to swing away from the protrusion 612, thereby causing the planar part of the hemisphere 613 to turn towards the inside of the protrusion 612.

[0036] refer to Figure 4 , Figure 5 and Figure 6The fixed part 62 has an identical structure. During the installation of the latch 31, i.e., the locking process of the splicing clip 3, the movable part 61 and the fixed part 62 are aligned. At this time, the protrusion 612 of the fixed part 62 passes through the through hole 7 on the housing of the movable part 61 and inserts into the housing 611 of the movable part 61. Simultaneously, the hemisphere 613 of the fixed part 62 and the plane of the hemisphere 613 of the movable part 61 face each other and contact each other. Under the action of the tension spring, the planes of the two hemispheres 613 tightly abut against each other, and because the two parts are centrally symmetrically installed, the two hemispheres 613 eventually assemble into a complete sphere. At this time, the two rotating cavities 81 also assemble into a complete sphere. Due to the tension of the tension spring, the splicing seam of the sphere is misaligned with the splicing seam of each rotating cavity 81, making it impossible for the two hemispheres 613 to separate, thus firmly locking the movable part 61 and the fixed part 62 together, achieving auxiliary locking. The end of the protrusion 612 is designed as a pointed cone to facilitate its insertion into the through hole 7 of the other party during docking. When unlocking is required, simply move any one of the levers 614 to make it swing towards the protrusion 612 against the tension of the spring, causing the hemisphere 613 to rotate, breaking the sphere's assembled state, and thus separating the two parts.

[0037] The implementation principle of this application embodiment is as follows: When heavy lifting or handling operations are required on the tractor, the bearing plate 12 and the complete lifting assembly 2 module installed on it are first lifted onto the vehicle body 1 and aligned with the positioning post 11. Then, the slot 311 of the splicing clip 3 is inserted into the edge of the vehicle body 1 and the bearing plate 12, and pushed horizontally towards the positioning post 11 until the ratchet 5 engages and locks with the triangular positioning post 11. At the same time, the moving part 61 and the fixed part 62 of the auxiliary locking mechanism 6 automatically interlock after docking. Afterward, the operator can control the hydraulic cylinder 24 to drive the boom 22 through the hydraulic system, and control the electric cylinder 233 to drive the extension and retraction of the forearm 23 through the electric control system, flexibly maneuvering the bucket 21 to complete actions such as scooping, lifting, handling, and stacking of goods. By adjusting the screw 4 on the column 25, the initial angle of the forearm 23 can also be changed to adapt to different operational needs. When only the towing function is needed, the auxiliary locking mechanism 6 can be unlocked first, and then the two clips of the splicing clip 3 can be pried open to quickly remove the entire lifting module and restore the towing vehicle to its original state.

[0038] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A multi-functional tractor capable of lifting heavy objects, comprising a body (1), characterized in that: The vehicle body (1) is provided with a positioning post (11), a support plate (12) and a lifting assembly (2). The positioning post (11) is vertically fixed on the vehicle body (1) and passes through the support plate (12). The support plate (12) is laid flat on the vehicle body (1) and inserted into the positioning post (11). A splicing clip (3) for detachable connection between the support plate (12) and the vehicle body (1) is provided. The lifting assembly (2) is fixed on the support plate (12). The lifting assembly (2) includes a bucket (21), a boom (22), a forearm (23), a hydraulic cylinder (24), a column (25) and a base (26). The base (26) is fixed on the support plate (12). On the upper part, the column (25) is fixed on the base (26). One end of the boom (22) is rotatably connected to the column (25), and the other end is rotatably connected to the outer wall of the bucket (21). One end of the forearm (23) is rotatably connected to the column (25), and the other end is rotatably connected to the outer wall of the bucket (21). The boom (22) and the forearm (23) are rotatably connected to the outer wall of the bucket (21) on the same side wall and the rotating shafts are both horizontally set. The bottom end of the hydraulic cylinder (24) is hinged to the base (26), and the piston end of the hydraulic cylinder (24) is hinged to the boom (22). The forearm (23) includes a telescopic section and a fixed section. The telescopic section is located on the forearm (23) near the bucket (21).

2. The multi-functional tractor unit capable of lifting heavy objects according to claim 1, characterized in that: The telescopic section includes an inner tube (231) and an outer tube (232). One end of the outer tube (232) is fixed to one end of the fixed section. One end of the inner tube (231) is slidably inserted into the inner tube (232), and the other end is rotatably connected to the outer wall of the bucket (21). An electric cylinder (233) is fixed on the outer wall of the outer tube (232). The piston end of the electric cylinder (233) is fixedly connected to the outer wall of the inner tube (231). The piston movement direction of the electric cylinder (233) is set in accordance with the length direction of the telescopic section.

3. The multi-functional tractor unit capable of lifting heavy objects according to claim 2, characterized in that: The column (25) includes a column body, a first gantry (251) and a second gantry (252). The bottom end of the column body is fixed to the base (26). The first gantry (251) is fixedly connected to the side wall of the column body. The bottom end of the second gantry (252) is rotatably connected to the first gantry (251). The top end of the second gantry (252) is rotatably connected to the end of the fixed section away from the telescopic section. The rotatable connection between the upper arm (22) and the column (25) is located on the first gantry (251). A screw (4) for adjusting the included angle between the top end of the first gantry (251) and the top end of the second gantry (252) is provided.

4. A multi-functional tractor capable of lifting heavy objects according to claim 1, characterized in that: The splicing fastener (3) includes a fastener plate (31), a left fastener strip (32), a right fastener strip (33), a cylinder (34), and a spring (35). The fastener plate (31) has a slot (311) on it. The edge of the vehicle body (1) and the edge of the support plate (12) are simultaneously and tightly inserted into the slot (311). The cylinder (34) is fixed to the top of the fastener plate (31). The left fastener strip (32) and the right fastener strip (33) are distributed on both sides of the cylinder (34) and are rotatably connected to the cylinder (34). The spring (35) is located on the cylinder. (34) Between the left locking bar (32) and the right locking bar (33) on one side, one end of the spring (35) is fixed to the left locking bar (32), and the other end is fixed to the right locking bar (33); ratchet (5) is fixed on the side wall opposite to the left locking bar (32) and the right locking bar (33). The ratchet (5) is located on the side of the cylinder (34) away from the spring (35). The horizontal cross section of the positioning post (11) is triangular to cooperate with the ratchet (5) to realize the one-way locking when the splicing piece (3) slides horizontally relative to the positioning post (11).

5. A multi-functional tractor capable of lifting heavy objects according to claim 4, characterized in that: The card plate (31) has a notch (312) located at the top of the card plate (31) and the opening is set towards the positioning post (11). The splicing card (3) covers the notch (312).

6. A multi-functional tractor capable of lifting heavy objects according to claim 4, characterized in that: An auxiliary locking mechanism (6) is provided between the card plate (31) and the vehicle body (1). The auxiliary locking mechanism (6) includes a movable part (61) and a fixed part (62). The fixed part (62) is fixed to the bottom of the vehicle body (1), and the movable part (61) is fixed to the card plate (31). The combination or separation of the fixed part (62) and the movable part (61) is used to control the locking or unlocking of the card plate (31) and the vehicle body (1).

7. A multi-functional tractor capable of lifting heavy objects according to claim 6, characterized in that: The movable part (61) includes a housing (611), a protrusion (612), a hemisphere (613), a lever (614), and an elastic element (615). The housing (611) is hollow inside. The protrusion (612) is fixed at one end of the housing (611) and fits the housing (611) in an L-shape. A through hole (7) is provided on the end face of the housing (611) where the protrusion (612) is located. The through hole (7) is set close to the edge of the protrusion (612). An extension is fixed on the edge of the protrusion (612) adjacent to the through hole (7). The extension plate (8) is located inside the housing (611). A hemispherical rotating cavity (81) is provided at the junction of the extension plate (8) and the protrusion (612). The hemisphere (613) is rotatably disposed inside the rotating cavity (81). One end of the lever (614) is fixed to the arc surface of the hemisphere (613), and the other end passes through the rotating cavity (81) and the housing (611) and is located outside the housing (611). Convection points are provided at the points through which the lever (614) passes through the rotating cavity (81) and the housing (611). The lever (614) has a clearance slot (82) for swinging; the lever (614) swings towards or away from the protrusion (612), one end of the elastic element (615) is fixed to the inner wall of the housing (611), and the other end is fixed to the lever (614). The elastic element (615) is used to pull the lever (614) to swing away from the protrusion (612); the structure of the fixed part (62) is completely identical to that of the movable part (61) and the two are arranged in a centrally symmetrical manner. The housing (611) of the movable part (61) is fixed to... At the bottom of the card plate (31), the housing (611) of the fixing part (62) is fixed to the bottom of the vehicle body (1); when the card plate (31) is locked to the vehicle body (1), the protrusion (612) of the fixing part (62) passes through the through hole (7) of the movable part (61) and is inserted into the housing (611) of the movable part (61). The hemisphere (613) of the fixing part (62) and the hemisphere (613) of the movable part (61) abut against each other to form a complete sphere, and the joint between the two is misaligned with the joint between the two rotating cavities (81).

8. A multi-functional tractor capable of lifting heavy objects according to claim 7, characterized in that: The end of the protrusion (612) facing away from the housing (611) is cone-shaped.

9. A multi-functional tractor capable of lifting heavy objects according to claim 7, characterized in that: The elastic element (615) is a tension spring.

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