Drive unit for semi-trailer

Abstract

The present invention provides a driving device for a semi-trailer, comprising a frame, a lifting assembly and a power assembly; the lifting assembly comprises a lifting drive, a connecting rod mechanism and two upper guide wheel mechanisms; the lifting drive comprises a shell mounted on the frame and a lifting rod capable of lifting relative to the shell; the two upper guide wheel mechanisms are arranged on both sides of the lifting drive, connected to the lifting drive through a connecting rod mechanism, and when the lifting rod descends, the two upper guide wheel mechanisms are relatively far away and can be pressed and supported on two adjacent front and rear tires of the semi-trailer, so that the frame is driven to rise when the lifting rod further descends; the power assembly comprises a rotating drive and a power wheel driven to rotate by the rotating drive; the rotating drive is mounted on the frame; the power wheel can rise with the frame to contact the two tires, and when driven to rotate by the rotating drive, the power wheel drives the tires to rotate to move the semi-trailer. The present invention can drive the semi-trailer to move on the production line, thereby improving production efficiency.

Description

Technical Field

[0001] This invention relates to auxiliary tooling for semi-trailer production, and particularly to a drive device for semi-trailers. Background Technology

[0002] To maintain production line flexibility, semi-trailer assembly lines can accommodate the production of multiple vehicle models. Traditional production lines often use ground-mounted chain conveyor systems to move semi-trailers. However, when producing different models of semi-trailers on the same line, the varying components and structures of the semi-trailers result in inconsistent production rhythms at different workstations. The chain conveyor system cannot adapt to the different rhythms of each model between workstations. In existing compatible production lines, moving semi-finished semi-trailers often relies on manual pushing or overhead crane hoisting. Overhead crane hoisting poses risks of working at height and personnel safety hazards; while semi-trailers weigh 3-5 tons, manual operation results in high labor loads for workers and low production efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide a drive device for semi-trailers, which facilitates the movement of semi-trailers on the production line, reduces labor intensity, and improves production efficiency.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: a drive device for a semi-trailer, comprising a frame, a lifting assembly, and a power assembly; the lifting assembly includes a lifting drive component, a linkage mechanism, and two upper guide wheel mechanisms; the lifting drive component includes a housing mounted on the frame and a lifting rod that can be raised and lowered relative to the housing; the two upper guide wheel mechanisms are arranged on both sides of the lifting drive component and connected to the lifting drive component through the linkage mechanism, and when the lifting rod descends, the two upper guide wheel mechanisms move away from each other and can press and support the two adjacent front and rear tires of the semi-trailer, thereby causing the frame to rise when the lifting rod descends further; the power assembly includes a rotary drive component and a power wheel driven to rotate by the rotary drive component; the rotary drive component is mounted on the frame; the power wheel can rise with the frame to contact the two tires, and when driven to rotate by the rotary drive component, it drives the tires to rotate, thereby moving the semi-trailer.

[0005] The linkage mechanism includes two symmetrically arranged upper linkages and two lower linkages, each hinged to one of the upper linkages. The upper end of each upper linkage is hinged to the lifting rod, and the lower end of each lower linkage is hinged to the housing. The upper guide wheel mechanism is installed at the hinge point between the upper and lower linkages. When the lifting rod descends, the upper linkages close relative to the lower linkages, causing the upper guide wheel mechanism to move laterally away from the lifting drive component, thus moving the two upper guide wheel mechanisms relatively away from each other.

[0006] The upper guide wheel mechanism includes an upper guide wheel shaft and two upper guide wheels rotatably mounted on the upper guide wheel shaft; the two upper guide wheels are arranged at intervals, and the interval is adjustable; the upper guide wheel shaft passes through the hinge joint of the upper connecting rod and the lower connecting rod.

[0007] The upper guide wheel shaft is threaded; the upper guide wheel mechanism also includes a spring and a limiting nut; the spring is sleeved on the upper guide wheel shaft and clamped between the upper guide wheel and the linkage mechanism; the limiting nut is screwed onto the upper guide wheel shaft and respectively blocks the outside of the upper guide wheel.

[0008] The hinge joint between the upper connecting rod and the lower connecting rod is provided with an internal thread, which is used to screw into the thread on the upper guide wheel shaft.

[0009] The lifting drive component is an electric push rod.

[0010] The frame is also equipped with two lower guide wheel mechanisms; the two lower guide wheel mechanisms are arranged on both sides of the lifting drive component and located below the upper guide wheel mechanism; when the power wheel contacts the two tires, the two lower guide wheel mechanisms respectively press one of the tires.

[0011] The lower guide wheel mechanism includes a lower guide wheel shaft and two lower guide wheels rotatably mounted on the lower guide wheel shaft; the two lower guide wheels are arranged at intervals, and the position of the lower guide wheels on the lower guide wheel shaft is adjustable.

[0012] The lower guide wheel is provided with a bearing and a bushing between the lower guide wheel shaft and the lower guide wheel shaft; the bushing is slidably fitted on the lower guide wheel shaft and can be fastened to the lower guide wheel shaft by radially installed fasteners; the bearing is disposed between the lower guide wheel and the bushing so that the lower guide wheel can rotate relative to the bushing.

[0013] The upper guide wheel and the lower guide wheel each include a guide wheel body and a flange located at the outer end of the guide wheel body and extending circumferentially out of the guide wheel body.

[0014] The rotary drive component includes a motor and a reducer, which are respectively mounted on the frame. The motor shaft drives the power wheel to rotate via the reducer.

[0015] The frame includes a base, a side fixing frame erected on one side of the base, and a support frame protruding upward from the side fixing frame onto the base; the rotation drive is fixedly mounted on the base; the bottom of the lifting drive is fixed on the base, and the middle part of the lifting drive is supported and fixed by the support frame.

[0016] The side fixing frame includes two support tubes arranged at intervals; both ends of the support frame are respectively connected to the two support tubes; and a housing space for accommodating the battery is formed between the two support tubes and the support frame.

[0017] The support frame is further provided with a fixing strip between its two ends. One end of the fixing strip is hinged to one end of the support frame, and the other end of the fixing strip is detachably fastened to the other end of the support frame.

[0018] The side fixing frame also includes a handrail; the handrail is inserted between the two support tubes, and the height of the handrail relative to the support tube is adjustable.

[0019] The number of support frames is multiple, and they are arranged at intervals along the height direction.

[0020] The base is also equipped with wheels.

[0021] As can be seen from the above technical solution, the present invention has at least the following advantages and positive effects: The drive device of the present invention can assist in the production of semi-trailers. Through the cooperation of the upper guide wheel mechanism of the lifting assembly and the power wheel of the power assembly, it can closely contact the two adjacent front and rear tires of the semi-trailer; then, through the rotation drive component of the power assembly, power is provided, and the power wheel drives the tires to rotate, thus moving the semi-trailer. The power drive device provides the power for the movement of the semi-trailer, replacing manual labor, reducing labor intensity, and improving production efficiency. With this drive device, the configuration of semi-trailer moving devices in the final assembly line can be reduced, facilitating the layout of the production line and improving its flexibility. At the same time, in this drive device, by utilizing the cooperation of the lifting drive component, the linkage mechanism, and the upper guide wheel mechanism, the state can be flexibly changed to contact or separate from the tires as needed, making it convenient to use. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the driving device according to an embodiment of the present invention.

[0023] Figure 2 yes Figure 1 A schematic diagram from another angle.

[0024] Figure 3 yes Figure 1 A structural decomposition diagram.

[0025] Figure 4 yes Figure 1 Exploded view of the structure of the lifting assembly.

[0026] Figures 5 to 7 yes Figure 1 A diagram illustrating the usage status.

[0027] The reference numerals in the attached drawings are explained as follows: 100, drive unit; 500, semi-trailer; 501, tire.

[0028] 1. Frame; 11. Base; 111. Beam; 1111. Mounting hole; 112. Mounting seat; 113. Guard rod; 12. Side fixing bracket; 121. Support tube; 122. Handrail; 13. Support frame; 131. Sleeve; 14. Fixing strip; 15. Traveling wheel; 16. Lower guide wheel mechanism; 161. Lower guide wheel shaft; 162. Lower guide wheel; 1621. Guide wheel body; 1622. Flange; 163. Fastener.

[0029] 2. Lifting assembly; 21. Lifting drive component; 211. Housing; 212. Lifting rod; 214. Rod end hinge; 215. Housing hinge; 22. Linkage mechanism; 221. Upper link; 222. Lower link; 2221. Hinge plate; 23. Upper guide wheel mechanism; 231. Upper guide wheel shaft; 232. Upper guide wheel; 2321. Guide wheel body; 2322. Flange; 233. Bearing; 234. Limit nut; 235. Mounting component.

[0030] 3. Power components; 31. Rotary drive components; 311. Motor; 312. Reducer; 32. Drive wheel.

[0031] 4. Electrical control components; 41. Control box; 42. Battery. Detailed Implementation

[0032] Typical embodiments embodying the features and advantages of the present invention will be described in detail in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0033] This invention provides a drive device for semi-trailers, suitable for moving semi-trailers on a semi-trailer assembly line.

[0034] See Figures 1 to 3 and refer to Figures 5 to 7The drive unit 100 in this embodiment mainly includes a frame 1, a lifting assembly 2, a power assembly 3, and an electronic control assembly 4. The frame 1 serves as the main support, housing the lifting assembly 2, the power assembly 3, and the electronic control assembly 4, and can be positioned between the two adjacent front and rear tires 501 of the semi-trailer 500. The lifting assembly 2 is equipped with a lifting drive component 21 and an upper guide wheel mechanism 23. The upper guide wheel mechanism 23 presses against and supports the two adjacent front and rear tires 501 of the semi-trailer 500, using the tires 501 as fulcrums to drive the frame 1 upwards. The power assembly 3 is equipped with a rotation drive component 31 and a drive wheel 32. The drive wheel 32 contacts the tires 501, causing the tires 501 to rotate and thus moving the semi-trailer 500. The electronic control assembly 4 provides the necessary power supply and electrical control.

[0035] like Figure 3 As shown, the frame 1 mainly includes a base 11, a side fixing frame 12 erected on one side of the base 11, a support frame 13 protruding from the side fixing frame 12 upwards from the base 11, and a traveling wheel 15 installed at the bottom of the base 11. Preferably, two sets of lower guide wheel mechanisms 16 are also arranged on the frame 1.

[0036] The main structure of the base 11 is roughly composed of multiple beams 111 arranged longitudinally and transversely. A mounting hole 1111 for mounting the lifting drive component 21 is provided on the central beam 111. On the side of the base 11 opposite to the side fixing frame 12, there is a mounting seat 112 for mounting the rotation drive component 31 and an outwardly protruding protective rod 113. However, it is understood that the structure of the base 11 can be flexibly designed according to actual conditions.

[0037] The side fixing frame 12 includes two spaced-apart support tubes 121 and a handrail 122 inserted between the two support tubes 121. The lower end of the support tube 121 is fixed to the base 11. The support tube 121 has a hollow structure, and the lower end of the handrail 122 is movably inserted into the support tube 121, thereby making the height of the handrail 122 relative to the support tube 121 adjustable. When the handrail 122 is adjusted to a predetermined height, it can be clamped and fixed to the support tube 121 by means of a pipe clamp or other structure. The side fixing frame 12 facilitates manual pushing of the frame 1.

[0038] Each end of the support frame 13 is fixed to a support tube 121. A sleeve 131 is provided in the middle of the support frame 13 for the lifting drive component 21 to pass through and be fixed. Multiple support frames 13 can be arranged at intervals in the height direction to support multiple positions of the lifting drive component 21 in the height direction, thereby improving the stability of the lifting drive component 21. The support frame 13 bends and extends upward from the support tube 121 toward the base 11, forming an accommodating space between the support frame 13 and the two support tubes 121, which can accommodate the installation of the power control component 4. A fixing strip 14 is also provided between the two ends of the support frame 13 (that is, between the two support tubes 121). One end of the fixing strip 14 is hinged to one end of the support frame 13, and the other end of the fixing strip 14 is detachably fastened to the other end of the support frame 13.

[0039] The traveling wheels 15 are preferably swivel casters, installed below the base 11 to facilitate the movement of the frame 1. It is understood that even without the traveling wheels 15, the frame 1 can still move by using other carriers, such as mounting it on a trolley.

[0040] The lower guide wheel mechanism 16 is arranged at intervals on the base 11, roughly opposite to the two support tubes 121, and symmetrically located on both sides of the mounting hole 1111. Each lower guide wheel mechanism 16 mainly includes a lower guide wheel shaft 161 and two lower guide wheels 162 rotatably sleeved on the lower guide wheel shaft 161.

[0041] The lower guide wheel shaft 161 extends along the side of the support tube 121 to the side of the mounting base 112, and both ends of the lower guide wheel shaft 161 are fixed to the corresponding fixing structures provided on the base 11.

[0042] Two lower guide wheels 162 are arranged at intervals along the length of the lower guide wheel shaft 161, and the position of the lower guide wheels 162 on the lower guide wheel shaft 161 is adjustable. In this embodiment, the lower guide wheels 162 are mounted on the lower guide wheel shaft 161 via bearings (not shown in the figure) and bushings (not shown in the figure). Specifically, the bushing is slidably fitted onto the lower guide wheel shaft 161 and fastened to the lower guide wheel shaft 161 by radially mounted fasteners 163. The bearing is disposed between the lower guide wheel 162 and the bushing, allowing the lower guide wheel 162 to rotate relative to the bushing. The lower guide wheel 162 is provided with through holes (not labeled in the figure) through which the fasteners 163 can pass. When it is necessary to adjust the position of the lower guide wheel 162, the fastener 163 can be loosened so that the bushing can slide relative to the lower guide wheel shaft 161, thereby adjusting the position of the lower guide wheel 162 on the lower guide wheel shaft 161; after adjusting to the predetermined position, the fastener 163 is tightened to fix the position of the bushing relative to the lower guide wheel shaft 161, and the lower guide wheel 162 will only be able to rotate relative to the lower guide wheel shaft 161.

[0043] Preferably, the lower guide wheel 162 includes a guide wheel body 1621 and a flange 1622 located at one end of the guide wheel body 1621 and extending circumferentially outward from the guide wheel body 1621. The guide wheel body 1621 is generally conical in shape, and the flange 1622 extends circumferentially outward from the larger end of the guide wheel body 1621. The smaller ends of the guide wheel bodies 1621 of the two lower guide wheels 162 are opposite to each other, while the flanges 1622 are relatively far apart and located at the outward-facing ends.

[0044] Still refer to Figure 3 The rotation drive component 31 of the power assembly 3 includes a motor 311 and a reducer 312. The motor shaft of the motor 311 drives the power wheel 32 to rotate via the reducer 312. Figure 1 The reducer 312 is fixedly mounted on the mounting base 112 of the base 11, and the motor 311 is fixedly connected to the reducer 312. The motor 311 is located above the protective rod 113 of the base 11. The rotary drive component 31 provides rotary motion, but other power drive structures can also be used. The drive wheel 32 is located between the two lower guide wheel mechanisms 16, and the radius of the drive wheel 32 is much larger than the radius of the lower guide wheels 162. The outer circumferential surface of the drive wheel 32 is preferably provided with an uneven pattern to increase friction.

[0045] See also Figure 3 and Figure 4 The lifting drive component 21 of the lifting assembly 2 is preferably an electric actuator, including a housing 211 and a lifting rod 212 that can be raised and lowered relative to the housing 211. This lifting rod 212 can also be referred to as a telescopic rod or a push rod in electric actuators. The electric actuator integrates a motor and a lead screw, directly outputting linear motion, and can achieve self-locking to maintain the position of the lifting rod 212, improving stability.

[0046] The two upper guide wheel mechanisms 23 are connected to the lifting drive component 21 through the linkage mechanism 22. Through the motion conversion of the linkage mechanism 22, when the lifting rod 212 of the lifting drive component 21 is raised or lowered, the two upper guide wheel mechanisms 23 move closer or further apart.

[0047] A housing hinge 215 is installed on the upper outer periphery of the housing 211, and a rod end hinge 214 is installed on the upper outer periphery of the lifting rod 212. The housing hinge 215 and the rod end hinge 214 each provide a pivot for mounting the linkage mechanism 22.

[0048] The linkage mechanism 22 includes two upper linkages 221 and two lower linkages 222, each hinged to one of the upper linkages 221. The two upper linkages 221 are symmetrically arranged on both sides of the lifting drive member 21, and the upper ends of the upper linkages 221 are hinged to the lifting rod 212 through rod end hinges 214; the two lower linkages 222 are correspondingly symmetrically arranged, and the lower ends of the lower linkages 222 are hinged to the housing 211 through housing hinges 215. The hinge points of the upper linkages 221 and lower linkages 222 are used for mounting the upper guide wheel mechanism 23. The linkage mechanism 22 forms a scissor-like structure. When the lifting rod 212 of the lifting drive 21 descends, the upper link 221 and the lower link 222 retract relative to each other, and the hinge of the upper link 221 and the lower link 222 moves laterally away from the lifting drive 21, thereby causing the two upper guide wheel mechanisms 23 to move away from each other. Conversely, when the lifting rod 212 rises, the upper link 221 and the lower link 222 unfold relative to each other, causing the two upper guide wheel mechanisms 23 to move closer to each other.

[0049] The hinge joint between the upper connecting rod 221 and the lower connecting rod 222 can be formed by various structural forms, and no limitation is made here. Figure 4 In the structure shown, the lower end of the upper connecting rod 221 is provided with a sleeve (not shown in the figure), and the sleeve has a smooth hole; while the upper end of the lower connecting rod 222 is provided with two spaced-apart hinge plates 2221, and the two hinge plates 2221 are provided with threaded holes (not shown in the figure). The lower end of the upper connecting rod 221 is located between the two hinge plates 2221 of the lower connecting rod 222, and the sleeve of the upper connecting rod 221 communicates with the threaded holes of the hinge plates 2221 of the lower connecting rod 222.

[0050] The upper guide wheel mechanism 23 mainly includes an upper guide wheel shaft 231 and two upper guide wheels 232 sleeved on the upper guide wheel shaft 231.

[0051] Two mounting parts 235 are provided in the middle of the upper guide wheel shaft 231 for fixing the upper guide wheel shaft 231 to the hinge joint of the upper connecting rod 221 and the lower connecting rod 222. In this embodiment, the upper guide wheel shaft 231 is a screw with threads. The upper guide wheel shaft 231 passes through the sleeve at the lower end of the upper connecting rod 221 and the hinge plate 2221 at the upper end of the lower connecting rod 222. The upper guide wheel shaft 231 is clearance-fitted with the sleeve and forms a threaded connection with the threaded hole of the hinge plate 2221. Therefore, the upper guide wheel shaft 231 is fixedly connected to the lower connecting rod 222, but can rotate relative to the upper connecting rod 221. That is to say, the upper guide wheel shaft 231 can also be considered as the hinge shaft that hinges the upper connecting rod 221 and the lower connecting rod 222. The two mounting parts 235 can be nuts, which are screwed onto the upper guide wheel shaft 231 and respectively abut against the outer sides of the two hinge plates 2221 of the lower connecting rod 222, fixing the axial relative position of the upper guide wheel shaft 231 and the lower connecting rod 222.

[0052] Two upper guide wheels 232 are respectively arranged at both ends of the upper guide wheel shaft 231; each upper guide wheel 232 is mounted on the upper guide wheel shaft 231 through a bearing 233, so that it can rotate relative to the upper guide wheel shaft 231.

[0053] The upper guide wheel 232 has a structure basically the same as the lower guide wheel 162. The upper guide wheel 232 also includes a guide wheel body 2321 and a flange 2322 located at one end of the guide wheel body 2321 and extending circumferentially outward from it. The guide wheel body 2321 is also conical in shape, and the flange 2322 extends circumferentially outward from the larger end of the guide wheel body 2321. The smaller ends of the guide wheel bodies 2321 of the two upper guide wheels 232 face each other, while the flanges 2322 are relatively far apart, located at the outward-facing end.

[0054] In this embodiment, a spring (not labeled in the figure) and a limiting nut 234 are also installed on the upper guide wheel shaft 231 to adjust the gap between the two upper guide wheels 232. The spring is sleeved on the upper guide wheel shaft 231, with its two ends abutting against the bearing 233 and the mounting part 235 respectively, and the spring is in a compressed state. The limiting nut 234 is screwed onto the upper guide wheel shaft 231 and stops on the outside of the upper guide wheel 232. When it is necessary to adjust the position of the upper guide wheel 232, by adjusting the axial position of the limiting nut 234 on the upper guide wheel shaft 231, the upper guide wheel 232 can be moved towards the mounting part 235 to further compress the spring, or the elastic restoring force of the spring can be used to push the upper guide wheel 232 away from the mounting part 235, thereby reducing or increasing the gap between the two upper guide wheels 232.

[0055] Combination Figures 1 to 3 When the lifting assembly 2 is installed on the frame 1, the bottom of the housing 211 of the lifting drive component 21 is installed in the mounting hole 1111 of the base 11, and the middle part of the housing 211 is supported by the sleeve 131 of the support frame 13. The two upper guide wheel mechanisms 23 are correspondingly located above the two lower guide wheel mechanisms 16.

[0056] Still refer to Figures 1 to 3 The electronic control assembly 4 includes a control box 41 and a battery 42. The control box 41 is mounted on the base 11 of the frame 1. The battery 42 is mounted above the control box 41 and is located in the accommodating space between the support frame 13 and the support tube 121. The back of the battery 42 is blocked by a fixing strip 14. Since one end of the fixing strip 14 is detachable, the battery 42 can be easily replaced. The control box 41 is equipped with the necessary controllers to control the operation of the lifting drive 21 and the rotation drive 31.

[0057] Based on the above structural description of the drive device 100, the following, combined with... Figures 5 to 7The method of using the drive unit 100 is described in detail. As mentioned above, the drive unit 100 is suitable for driving the movement of a semi-finished semi-trailer 500 on the final assembly line, wherein the tires 501 of the semi-trailer 500 have been installed.

[0058] For ease of description, the forward direction of a semi-trailer 500 in its operating state is defined as "forward" and the opposite direction as "rear".

[0059] In the initial state, the lifting rod 212 of the lifting drive component 21 is in the extended state, the linkage mechanism 22 is retracted, and the two upper guide wheel mechanisms 23 are retracted towards the lifting drive component 21. Figure 5 As shown, the drive unit 100 is pushed into the gap between the two adjacent tires 501 of the semi-trailer 500. The state after being pushed in is as follows. Figure 6 As shown. At this time, the frame 1 of the drive unit 100 is still on the ground, and the upper guide wheel 232, lower guide wheel 162, and drive wheel 32 are not in contact with the tires 501 of the semi-trailer 500.

[0060] The lifting drive unit 21 is activated, and the lifting rod 212 of the lifting drive unit 21 descends and retracts, driving the linkage mechanism 22 to extend outward, driving the two upper guide wheel mechanisms 23 to move away from each other. One upper guide wheel mechanism 23 moves forward closer to the front tire 501, and the other upper guide wheel mechanism 23 moves backward closer to the rear tire 501. When the upper guide wheels 232 of both upper guide wheel mechanisms 23 contact and press against the upper rim of the tire 501, the two upper guide wheel mechanisms 23 can support the tire 501. The lifting rod 212 then descends and retracts further relative to the housing 211. At this time, with the tire 501 as the support point, the housing 211 will rise, driving the entire frame 1 and the power assembly 3 to rise together, until the lower guide wheel 162 of the lower guide wheel mechanism 16 presses against the lower rim of the tire 501, and at the same time, the power wheel 32 is in close contact with the front and rear tires 501. The state at this time is as follows. Figure 7 As shown.

[0061] Restart the rotary drive unit 31, and the power wheel 32 rotates, thereby driving the tire 501 to rotate, so that the semi-trailer 500 can move. After reaching the preset position, stop the rotary drive unit 31.

[0062] Next, the lifting drive unit 21 is activated, causing its lifting rod 212 to extend upward relative to the housing 211, driving the linkage mechanism 22 to retract inward. The two upper guide wheel mechanisms 23 move closer together, and the upper guide wheels 232 slowly descend along the upper rim of the tire 501. The entire drive unit 100 descends until the frame 1 touches the ground. The lifting rod 212 continues to extend, and the two upper guide wheel mechanisms 23 continue to retract inward, so that the entire machine completely detaches from the tire 501 and maintains a gap with the tire 501, i.e., returns to its original position. Figure 6The state shown. At this point, the entire drive unit 100 can be moved out of the gap between the tires 501 of the semi-trailer 500, as shown. Figure 5 As shown.

[0063] Based on the above description, the driving device of this embodiment has at least the following advantages:

[0064] 1. The lifting component and the power component work together to contact and fix the semi-trailer's tires. The power component provides the power to move the semi-trailer, replacing manual labor, reducing labor intensity, and improving production efficiency.

[0065] 2. The lifting drive component, linkage mechanism and upper guide wheel mechanism of the lifting assembly cooperate to flexibly change the state to contact or separate from the tire as needed, which is convenient to use.

[0066] 3. The linkage mechanism adopts a scissor-type structure, which is simple in structure and smooth in transmission.

[0067] 4. The frame is equipped with a lower guide wheel mechanism, which works in conjunction with the upper guide wheel mechanism to make the contact between the drive unit and the tire more stable.

[0068] 5. The spacing between the two upper guide wheels (or lower guide wheels) on the same upper guide wheel axle (or lower guide wheel axle) can be adjusted, which can easily adapt to semi-trailers with different tire specifications.

[0069] 6. Both the upper and lower guide wheels include a guide wheel body and a flange. The guide wheel body is used to rotate and engage with the outer periphery of the tire, while the flange can stop outside the end face of the tire, making the pressing fit between the upper guide wheel (or lower guide wheel) and the tire more secure, and better controlling the tire's direction of travel to prevent the drive unit from veering off course.

[0070] 7. The frame is equipped with handrails for easy manual pushing; the bottom of the frame is equipped with casters for easy movement of the entire machine.

[0071] Although the invention has been described with reference to several typical embodiments, it should be understood that the terminology used is illustrative and exemplary, and not restrictive. Since the invention can be embodied in many forms without departing from the spirit or essence of the invention, it should be understood that the above embodiments are not limited to any of the foregoing details, but should be interpreted broadly within the spirit and scope defined by the appended claims. Therefore, all variations and modifications falling within the scope of the claims or their equivalents should be covered by the appended claims.

Claims

1. A driving device for a semi-trailer, characterized in that: include: frame; A lifting assembly, comprising a lifting drive member, a connecting rod mechanism and two upper guide wheel mechanisms; The lifting drive member includes a shell mounted on the frame and a lifting rod that can be lifted and lowered relative to the shell; the two upper guide wheel mechanisms are arranged on both sides of the lifting drive member and are connected to the lifting drive member through the connecting rod mechanism, and when the lifting rod descends, the two upper guide wheel mechanisms are relatively separated and can be pressed and supported on the two adjacent front and rear tires of the semi-trailer, so that when the lifting rod further descends, the frame is driven to rise; The power assembly includes a rotary drive member and a power wheel driven to rotate by the rotary drive member; the rotary drive member is installed on the frame; the power wheel can rise with the frame to contact the two tires, and when driven to rotate by the rotary drive member, it drives the tires to rotate to move the semi-trailer.

2. The driving device according to claim 1, characterized in that: The connecting rod mechanism comprises two upper connecting rods arranged symmetrically and two lower connecting rods respectively hinged to one of the upper connecting rods; The upper end of the upper connecting rod is hinged to the lifting rod, and the lower end of the lower connecting rod is hinged to the housing; the upper guide wheel mechanism is installed at the hinge between the upper connecting rod and the lower connecting rod; When the lifting rod descends, the upper connecting rod closes relative to the lower connecting rod, driving the upper guide wheel mechanism to move laterally in a direction away from the lifting drive member, so that the two upper guide wheel mechanisms are relatively away from each other.

3. The driving device according to claim 2, characterized in that: The upper guide wheel mechanism comprises an upper guide wheel shaft and two upper guide wheels rotatably mounted on the upper guide wheel shaft; the two upper guide wheels are arranged at intervals, and the intervals are adjustable; the upper guide wheel shaft passes through the hinge between the upper connecting rod and the lower connecting rod.

4. The driving device according to claim 3, characterized in that: The upper guide wheel shaft is provided with a thread; the upper guide wheel mechanism also includes a spring and a limit nut; the spring is sleeved on the upper guide wheel shaft and is clamped between the upper guide wheel and the connecting rod mechanism; the limit nut is threaded on the upper guide wheel shaft and is stopped on the outer side of the upper guide wheel respectively.

5. The driving device according to claim 4, characterized in that: An internal thread is provided at the hinge of the upper connecting rod and the lower connecting rod, and the internal thread is used for threaded connection with the thread on the upper guide wheel shaft.

6. The driving device according to claim 1, characterized in that: The lifting drive member is an electric push rod.

7. The driving device according to claim 1, characterized in that: The frame is also provided with two lower guide wheel mechanisms; the two lower guide wheel mechanisms are arranged on both sides of the lifting drive member and are located below the upper guide wheel mechanism; when the power wheel contacts the two tires, the two lower guide wheel mechanisms respectively press one of the tires accordingly.

8. The driving device according to claim 7, characterized in that: The lower guide wheel mechanism comprises a lower guide wheel shaft and two lower guide wheels rotatably mounted on the lower guide wheel shaft; the two lower guide wheels are arranged at intervals, and the positions of the lower guide wheels on the lower guide wheel shaft are adjustable.

9. The driving device according to claim 8, characterized in that: A bearing and a sleeve are provided between the lower guide wheel and the lower guide wheel shaft; the sleeve is slidably mounted on the lower guide wheel shaft and can be fastened to the lower guide wheel shaft by radially installed fasteners; the bearing is arranged between the lower guide wheel and the sleeve so that the lower guide wheel can rotate relative to the sleeve.

10. The driving device according to claim 7, characterized in that: The upper guide wheel and the lower guide wheel both include a guide wheel body and a flange located at the outer end of the guide wheel body and circumferentially protruding from the guide wheel body.

11. The driving device according to claim 1, characterized in that: The rotary drive member includes a motor and a reducer, and the motor and the reducer are respectively mounted on the frame, and the motor shaft of the motor drives the power wheel to rotate via the reducer.

12. The driving device according to any one of claims 1 to 10, characterized in that: The frame includes a base, a side fixing frame erected on one side of the base, and a support frame protruding from the side fixing frame to the top of the base; The rotary drive member is fixedly mounted on the base; The bottom of the lifting drive member is fixed on the base, and the middle part of the lifting drive member is supported and fixed by the supporting frame.

13. The driving device according to claim 12, characterized in that: The side fixing frame includes two support tubes arranged at intervals; two ends of the support frame are respectively connected to the two support tubes; and a storage space for accommodating batteries is formed between the two support tubes and the support frame.

14. The driving device according to claim 13, characterized in that: A fixing strip is also provided between the two ends of the support frame, one end of the fixing strip is hinged to one end of the support frame, and the other end of the fixing strip is detachably buckled to the other end of the support frame.

15. The driving device according to claim 13, characterized in that: The side fixing frame also includes a handrail rod; the handrail rod is inserted between the two support tubes, and the height of the handrail rod relative to the support tubes is adjustable.

16. The driving device according to claim 12, characterized in that: There are multiple support frames, which are arranged at intervals along the height direction.

17. The driving device according to claim 12, characterized in that: The bottom of the base is also provided with walking wheels.

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