A carrier with double-sided pallet carrying function and a carrying method thereof

Abstract

The present application provides a carrying vehicle with double-sided tray carrying function, which comprises a vehicle body, a fork, and a roll-preventing mechanism. The fork comprises a swing arm connected with a pull rod seat through a fifth rotating shaft and connected with a lifting unit through a sixth rotating shaft which can translate up and down. The fifth rotating shaft is located below the sixth rotating shaft and higher than the second and fourth rotating shafts. When the lifting unit operates, the sixth rotating shaft can be translated upwards, the swing arm swings, the pull rod seat is rotated, the pull rod pushes the support wheel frame forward and upwards, the support wheel frame is retracted, the double-sided tray is inserted, and the carrying vehicle has the double-sided tray carrying function. The sliding block of the roll-preventing mechanism is embedded in the sliding groove on the support seat and can slide up and down. The guide plate is connected to the outside of the sliding block, and the auxiliary wheel is arranged at the lower end of the guide plate. When the sliding block slides downwards, the auxiliary wheel can be driven to move downwards and abut against the support surface through the guide plate, and the safety is better. The carrying method provided by the present application has few steps, simple operation, and direct effect.

Description

Technical Field

[0001] This invention relates to the field of pallet handling technology, specifically to a handling vehicle with double-sided pallet handling function and its handling method. Background Technology

[0002] Pallets are carriers for stacking goods. They usually have slots on their sides for forks to insert and handle. Traditional pallets are single-sided, with the slots extending downwards through the back of the pallet. When using them, the front of the pallet must be facing upwards. They do not have a foolproof function. If the front is damaged or has a missing corner, it will affect the ability to support the goods. If the damage or missing corner is severe, the pallet will be unusable. To solve this problem, double-sided pallets have appeared on the market. The slots on these pallets only extend through the side walls, allowing the pallet to support goods on both the front and back. When using them, there is no need to distinguish between the front and back, making them convenient to operate. Damage or missing corners on either side will not affect the use of the other side.

[0003] However, existing pallet truck structures have not been modified to address the characteristics of double-sided pallets. For example, Chinese patents CN218968790U, CN217996716U, CN215854923U, and CN219567472U all disclose such pallet trucks. Because the slots for double-sided pallets only have openings on the side walls, during transport, the truck's forks need to be raised to align with the slots for insertion. When the forks are raised, the load-bearing wheel frame at the front of the forks is suspended and lowered, which can prevent the forks from entering. Forcing the slots open can easily lead to cracking or misalignment of the pallets. When stacking double-sided pallets, the load-bearing wheel frame and its wheels are suspended in the air and cannot provide support. The weight of the trolley, pallets, and stacked goods rests entirely on the rollers at the bottom of the vehicle. The arrangement of these rollers is affected by the vehicle's footprint, and their lateral support spacing is usually small, resulting in a certain risk of tilting the vehicle. This poses a significant safety hazard and does not have a true double-sided pallet handling function, nor is there a specific method for handling double-sided pallets. Summary of the Invention

[0004] The purpose of this invention is to solve the problems of the prior art by providing a transport vehicle with double-sided pallet handling function, and a method specifically for handling double-sided pallets.

[0005] To achieve the above objectives, the product in the technical solution adopted by the present invention is a pallet truck with double-sided pallet handling function, comprising:

[0006] A movable vehicle body;

[0007] The forks are located at the front end of the vehicle body. The forks include fork plates, tie rods, a load-bearing wheel frame, a load-bearing wheel, and a tie rod seat. The tie rod extends in a front-rear direction and is located below the fork plates. The front end of the tie rod is rotatably connected to the load-bearing wheel frame via a first rotating shaft, and the rear end of the tie rod is rotatably connected to the tie rod seat via a second rotating shaft. The load-bearing wheel frame is rotatably connected to the front end of the fork plates via a third rotating shaft. The third rotating shaft is located behind the first rotating shaft and higher than the tie rod. The load-bearing wheel is rotatably connected to the load-bearing wheel frame and is located in front of the first rotating shaft and the third rotating shaft. The tie rod seat is connected to a lifting mechanism via a vertically movable fourth rotating shaft. When the lifting mechanism is activated, it can drive the fourth rotating shaft and the rear end of the fork plates to move vertically.

[0008] Anti-rollover mechanisms are installed on both sides of the vehicle body;

[0009] The fork also includes a swing arm located above the pull rod seat. The swing arm is rotatably connected to the pull rod seat via a fifth rotating shaft and connected to the lifting unit via a sixth rotating shaft that can move up and down. The fifth rotating shaft is located below and in front of the sixth rotating shaft and is higher than the second and fourth rotating shafts. When the lifting unit operates, it can drive the sixth rotating shaft to move upward, thereby causing the swing arm to swing. The fifth rotating shaft pulls the pull rod seat to rotate around the fourth rotating shaft, causing the pull rod to push the load-bearing wheel frame forward and upward under the drive of the second rotating shaft. This causes the load-bearing wheel frame to rotate forward and upward around the third rotating shaft, thus achieving retraction.

[0010] The anti-roll mechanism includes a support base, a slide groove, a slider, a guide plate, an auxiliary wheel, and a drive assembly. The support base is an elongated strip extending in the vertical direction and is detachably fixed to the side wall of the vehicle body. The slide groove is formed in the middle of the support base and extends in the vertical direction. The slider is slidably embedded in the slide groove. The guide plate is located on the outside of the support base, and its upper end is connected to the slider. The auxiliary wheel is rotatably connected to the lower end of the guide plate. The drive assembly is used to drive the slider to slide up and down. When the drive assembly is activated, it can drive the guide plate to move up and down through the slider, causing the auxiliary wheel to disengage from or abut against the support surface.

[0011] Preferably, in the front-to-back direction, the centerline of the fourth rotating shaft is flush with the centerline of the sixth rotating shaft.

[0012] Preferably, the pull rod base includes two clamping plates whose projections in the left-right direction are triangular. These two clamping plates are clamped on the left and right sides of the pull rod. The second rotating shaft, the fourth rotating shaft, and the fifth rotating shaft are mounted between the two clamping plates. The second rotating shaft and the fourth rotating shaft are respectively located near the two bottom feet of the clamping plates, and the fifth rotating shaft is located near the top corner of the clamping plates.

[0013] Preferably, the rear end of the fork plate overlaps the fourth rotating shaft, and the left and right sides of the fork plate extend downward to form a skirt covering the load-bearing wheel frame and the load-bearing wheel. The two ends of the third rotating shaft are rotatably connected to the inner wall of the skirt.

[0014] Preferably, there are two sets of bearing wheels, and the axles of these two sets of bearing wheels are rotatably connected to the front and rear ends of the adapter plate, respectively. The middle part of the adapter plate is rotatably connected to the bearing wheel frame through a seventh rotating shaft.

[0015] Preferably, the support is located close to the front end of the vehicle body, and the distance between the support and the front end of the vehicle body is less than or equal to 10mm.

[0016] Preferably, the slide groove extends through the support base in the left-right direction, and the groove edge of the slide groove protrudes outward to form a boss, and the outer side of the slider protrudes from or is flush with the end face of the boss.

[0017] More preferably, the front and rear ends of the guide plate are folded vertically toward the direction of the support base to form a retaining edge located on the front and rear sides of the boss, and the retaining edge is spaced apart from the boss.

[0018] More preferably, the anti-tilt mechanism further includes a proximity switch for detecting the position of the guide plate. The proximity switch is connected to the outer wall of the support and located between the boss and the stop. When the upper end of the guide plate moves upward to block the proximity switch, the proximity switch is triggered.

[0019] Preferably, the outer side of the slider is provided with an outwardly protruding positioning pin, and the positioning pin is also provided with threaded holes around it for locking the guide plate. The upper end of the guide plate is provided with a positioning hole that matches the positioning pin and a bolt hole that corresponds to the threaded hole.

[0020] Preferably, the lower end of the guide plate gradually tapers inward to form a support lug, and the axle of the auxiliary wheel is rotatably connected to the support lug, with the rotation axis of the axle extending horizontally in the left-right direction.

[0021] Preferably, the drive assembly includes a motor, a lead screw, and a lead screw nut. The motor is connected to the top of the support base, and the output shaft of the motor passes downward through the top plate of the support base. The lead screw extends in the vertical direction, with its upper end located in the slide groove and connected to the output shaft of the motor. The lower end of the lead screw passes through the bottom plate of the support base and is rotatably connected to the bottom plate. The lead screw nut passes through the middle of the slider and is fixedly connected to the slider. The lead screw nut is also sleeved on the lead screw.

[0022] More preferably, the drive assembly further includes a driver and a brake connected sequentially from top to bottom to the top of the motor.

[0023] Preferably, the anti-tilt mechanism further includes an outer cover, which is connected to the side of the main body and covers the upper end of the drive assembly, the support base, and the guide plate.

[0024] Preferably, the vehicle body is further provided with a charging brush, a navigation laser bracket, a navigation laser device, an operating handle, an armrest assembly, a pedal assembly, and a safety anti-collision assembly. The charging brush is connected to one side of the vehicle body and located above the anti-rollover mechanism. The navigation laser bracket is connected to one side of the top of the vehicle body and extends vertically upward. The navigation laser device is connected to the top of the navigation laser device bracket. The operating handle is rotatably connected to the top of the vehicle body. The armrest assembly is connected to the rear end face of the vehicle body and located below the operating handle. The pedal assembly is rotatably connected to the rear end face of the vehicle body and located below the armrest assembly. The safety anti-collision assembly is connected to the bottom of the vehicle body and is arranged around the rear end face and both sides of the vehicle body.

[0025] To achieve the above objectives, the technical solution adopted by the present invention is a double-sided pallet handling method, which uses the handling vehicle described in any one of the above-mentioned methods for handling, and the handling method includes the following steps:

[0026] S1. Activate the lifting mechanism to drive the fourth rotating shaft and the rear end of the fork plate to move upward. When the fourth rotating shaft moves upward, the pull rod seat rotates accordingly, causing the second rotating shaft to rotate downward around the fourth rotating shaft, pulling the pull rod backward, causing the pull rod to drive the bearing wheel frame to rotate downward around the third rotating shaft, causing the bearing wheel frame to be lowered, causing the bearing wheel to press against the support surface, and causing the front end of the fork plate to move upward accordingly.

[0027] S2. When the load-bearing wheel moves up with the fork plate to the point where it is about to leave the support surface, stop the lifting mechanism, start the drive assembly, and make the slider slide down, thereby driving the guide plate to move down.

[0028] S3. When the auxiliary wheel contacts and supports the support surface, stop the drive assembly and start the lifting mechanism to move the fork plate upward.

[0029] S4. When the fork plate moves to be aligned with the slot opening on the side of the double-sided pallet, stop the lifting mechanism, start the lifting unit, so that the sixth rotating axis moves upward, drives the swing arm to swing, and pulls the pull rod seat to rotate through the fifth rotating axis, so that the second rotating axis rotates forward and upward around the fourth rotating axis, pushes the pull rod forward, so that the pull rod drives the load-bearing wheel frame to rotate forward and upward around the third rotating axis, so that the load-bearing wheel frame retracts;

[0030] S5. After the load-bearing wheel frame is fully retracted, move the vehicle body so that the forks are inserted into the slots of the double-sided pallet;

[0031] S6. After the forks are fully inserted into the slots and the load-bearing wheel frame extends out of the double-sided pallet, the lifting mechanism is activated to lift the double-sided pallet with the forks;

[0032] S7. After the double-sided pallet is fully lifted, stop the lifting mechanism, move the vehicle body, and transport the double-sided pallet to the preset position;

[0033] S8. Activate the lifting mechanism to drive the fourth rotating shaft and the rear end of the fork plate to move downward, so that the bearing wheel contacts and supports the support surface;

[0034] S9. When the double-sided pallet is completely placed on the support surface, stop the lifting mechanism, start the lifting unit, so that the sixth rotating axis moves upward, drives the swing arm to swing, and pulls the pull rod seat to rotate through the fifth rotating axis, so that the second rotating axis rotates forward and upward around the fourth rotating axis, pushes the pull rod forward, and drives the load-bearing wheel frame to rotate forward and upward around the third rotating axis, so that the load-bearing wheel frame retracts.

[0035] S10. Move the vehicle body so that the forks can smoothly detach from the double-sided pallet, completing the handling operation of the double-sided pallet.

[0036] Due to the application of the above technical solution, the present invention has the following advantages compared with the prior art:

[0037] The pallet truck provided by this invention, when the lifting mechanism is activated, can drive the fourth rotating axis to translate upwards, causing the tie rod seat to rotate accordingly. This causes the second rotating axis to rotate downwards and backwards around the fourth rotating axis and pull the tie rod backwards. The tie rod then drives the load-bearing wheel frame to rotate downwards and backwards around the third rotating axis, causing the load-bearing wheel frame to lower and lifting the forks. When the forks are lifted to be flush with the slot of the double-sided pallet, activating the lifting unit can drive the sixth rotating axis to translate upwards, causing the swing arm to swing. The fifth rotating axis then pulls the tie rod seat to rotate, causing the second rotating axis to rotate upwards and forwards around the fourth rotating axis, pushing the tie rod forwards. This causes the tie rod to drive the load-bearing wheel frame to rotate upwards and forwards around the third rotating axis, causing the load-bearing wheel frame to retract, thereby reducing the thickness of the fork front end and facilitating the insertion of the double-sided pallet. During stacking operations, the drive component can also drive the slider to slide downwards, causing the guide plate to move downwards, thus supporting the auxiliary wheels on the support surface and providing lateral support to the vehicle body.

[0038] In other words, the transport vehicle provided by this invention can perform both ordinary pallet handling and stacking operations, as well as double-sided pallet handling and stacking operations. It is also less likely to damage double-sided pallets, can provide additional lateral support, has a wider range of applications, and is safer.

[0039] The handling method provided by this invention allows the guide plate to slide down via a slider when the load-bearing wheel is about to detach from the support surface, so that the auxiliary wheel is supported on the support surface to form lateral support, which can ensure the stability of the handling operation. At the same time, when the load-bearing wheel frame is suspended and lowered, the sixth rotating shaft can be moved upward by the lifting unit to push the load-bearing wheel frame forward and retract it, which can reduce the thickness of the front end of the fork and facilitate its insertion into the slot opening on the side of the double-sided pallet. The method has fewer steps, is simple to operate, and has direct effects. Attached Figure Description

[0040] Figure 1 This is a rear view schematic diagram of a preferred embodiment of the transport vehicle in this invention.

[0041] Figure 2 yes Figure 1 A three-dimensional schematic diagram.

[0042] Figure 3 , Figure 4 yes Figure 2 A 3D schematic diagram of the forklift with the fork plates removed. Figure 3 The load-bearing wheel frame is in the lowered position. Figure 4 The load-bearing wheel frame is in the retracted state.

[0043] Figure 5 yes Figure 1 A three-dimensional schematic diagram of the anti-tilt mechanism; the outer casing has been omitted for easier observation.

[0044] Figure 6 yes Figure 5 A 3D schematic diagram with the upper end of the guide plate hidden.

[0045] Figure 7 yes Figure 5 A 3D diagram of the back.

[0046] The components include: 10. Vehicle body; 11. Roller; 12. Charging brush; 13. Navigation laser bracket; 14. Navigation laser unit; 15. Operating handle; 16. Handrail assembly; 17. Pedal assembly; 18. Safety anti-collision assembly; 20. Forks; 21. Fork plate; 211. Skirt; 22. Tie rod; 221. First rotating shaft; 222. Second rotating shaft; 23. Load-bearing wheel frame; 231. Third rotating shaft; 24. Load-bearing wheel; 25. Tie rod seat; 251. Fourth rotating shaft; 252. Clamping plate; 26. Swing arm; 261. Fifth rotating shaft. 262. Moving shaft; 27. Sixth rotating shaft; 271. Adapter plate; 271. Seventh rotating shaft; 30. Anti-tilt mechanism; 31. Support base; 32. Slide groove; 321. Boss; 33. Slider; 331. Positioning pin; 332. Threaded hole; 34. Guide plate; 341. Side flange; 342. Positioning hole; 343. Bolt hole; 344. Support lug; 35. Auxiliary wheel; 351. Wheel axle; 361. Motor; 362. Lead screw; 363. Nut; 364. Brake; 365. Driver; 37. Outer casing; 38. Proximity switch. Detailed Implementation

[0047] The up-down, left-right, and front-back directions described in this invention are Figure 1 The directions of up, down, right, left, inside, and outside.

[0048] like Figures 1 to 7As shown, the pallet handling vehicle with double-sided pallet handling function provided by the present invention includes: a vehicle body 10, forks 20, and an anti-tilt mechanism 30. The vehicle body 10 has rollers 11 at its bottom, allowing it to move horizontally via the rollers. The forks 20 are located at the front end of the vehicle body 10 and include fork plates 21, a pull rod 22, a load-bearing wheel frame 23, load-bearing wheels 24, a pull rod seat 25, and a swing arm 26. Specifically, the fork plates 21 are used to insert into slots of the double-sided pallet for support. The fork plates 21 extend in the front-to-back direction and are vertically slidable. The pull rod 22 extends in the front-to-back direction and is located below the fork plates 21. The front end of the pull rod 22 is rotatably connected to the load-bearing wheel frame 23 via a first rotating shaft 221. The rear end of the pull rod 21 is rotatably connected to the pull rod seat 24 via the second rotating shaft 222. The bearing wheel frame 23 is rotatably connected to the front end of the fork plate 21 via the third rotating shaft 231. The third rotating shaft 231 is located behind the first rotating shaft 221 and higher than the pull rod 22. The bearing wheel 24 is rotatably connected to the bearing wheel frame 23 and is located in front of the first rotating shaft 221 and the third rotating shaft 231. The pull rod seat 25 is connected to the lifting mechanism (not shown in the figure) via the vertically movable fourth rotating shaft 251. When the lifting mechanism is activated, it can drive the fourth rotating shaft 251 and the rear end of the fork plate 21 to move vertically. The swing arm 26 is located above the pull rod seat 25 and is connected to the fifth rotating shaft 26. 1. The arm is rotatably connected to the tie rod seat 25 and connected to the lifting unit (not shown in the figure) via the sixth rotating shaft 262, which can move up and down. The fifth rotating shaft 261 is located below and in front of the sixth rotating shaft 262 and is higher than the second rotating shaft 222 and the fourth rotating shaft 251. When the lifting unit is in operation, it can drive the sixth rotating shaft 262 to move upward, thereby swinging the swing arm 26. The fifth rotating shaft 261 pulls the tie rod seat 25 to rotate around the fourth rotating shaft 251, so that the tie rod 22 pushes the bearing wheel frame 23 forward and upward under the drive of the second rotating shaft 222, so that the bearing wheel frame 23 rotates forward and upward around the third rotating shaft 231, thus achieving retraction. The anti-tilt mechanism 30 is provided on the left and right sides of the vehicle body 10 to prevent tilting. The tilting mechanism 30 includes a support base 31, a slide groove 32, a slider 33, a guide plate 34, an auxiliary wheel 35, and a drive assembly. The support base 31 is a long strip extending in the vertical direction and is detachably fixed to the side wall of the vehicle body 10. The slide groove 32 is opened in the middle of the support base 31 and extends in the vertical direction. The slider 33 is slidably embedded in the slide groove 32. The guide plate 34 is located on the outside of the support base 31. The upper end of the guide plate 34 is connected to the slider 33. The auxiliary wheel 35 is rotatably connected to the lower end of the guide plate 34. The drive assembly is used to drive the slider 33 to slide up and down. When the drive assembly is activated, it can drive the guide plate 34 to move up and down through the slider 33, so that the auxiliary wheel 35 disengages from or abuts against the support surface.

[0049] The advantage of this setting is that:

[0050] When the lifting mechanism is activated, the fourth rotating axis is moved upward, causing the tie rod seat to rotate accordingly. This causes the second rotating axis to rotate downward and backward around the fourth rotating axis, pulling the tie rod backward. The tie rod then causes the load-bearing wheel frame to rotate downward and backward around the third rotating axis, lowering the load-bearing wheel frame and lifting the forks. When the forks are lifted to be flush with the slot of the double-sided pallet, activating the lifting unit causes the sixth rotating axis to move upward, swinging the swing arm. The fifth rotating axis then pulls the tie rod seat to rotate, causing the second rotating axis to rotate upward and forward around the fourth rotating axis, pushing the tie rod forward. This causes the tie rod to rotate upward and forward around the third rotating axis, retracting the load-bearing wheel frame and reducing the thickness of the fork tip for easier insertion of the double-sided pallet. During stacking operations, the drive assembly can also cause the slider to slide downward, moving the guide plate downward so that the auxiliary wheel is supported on the support surface, providing lateral support to the vehicle body.

[0051] In other words, this pallet truck can handle both ordinary pallets and double-sided pallets, and it is less likely to damage double-sided pallets and can provide additional lateral support, making it more versatile and safer.

[0052] To facilitate the vertical translation of the fourth rotating shaft 251 and the sixth rotating shaft 262, this embodiment employs a vertical slot on the vehicle body. Specifically, the two ends of the fourth rotating shaft 251 and the sixth rotating shaft 262 are inserted into the vertical slot to achieve the technical effect of being able to translate only in the vertical direction. To simplify the structure, the fourth rotating shaft 251 and the sixth rotating shaft 262 preferably share the same vertical slot. To achieve this, the centerline of the fourth rotating shaft 251 is flush with the centerline of the sixth rotating shaft 262 in the front-rear direction.

[0053] To facilitate the arrangement of the components, in this embodiment, the pull rod seat 25 comprises two clamping plates 252 whose projections in the left-right direction are triangular. These two clamping plates 252 extend vertically in the front-back direction and are clamped on the left and right sides of the rear end of the pull rod 22. The second rotating shaft 222, the fourth rotating shaft 251, and the fifth rotating shaft 261 are mounted between these two clamping plates 252. Specifically, the second rotating shaft 222 and the fourth rotating shaft 251 are respectively located near the two bottom feet of the clamping plates 252, and the fifth rotating shaft 261 is located near the apex of the clamping plate 252. Preferably, the apex is an acute angle. At the same time, the two clamping plates 252 and the fourth rotating shaft 251 are connected as a whole to form the pull rod seat 25. More preferably, the projection of the clamping plates 252 in the left-right direction is an isosceles triangle with an acute apex.

[0054] To make the fork plate 21 more stable when moving up and down, in this embodiment, the rear end of the fork plate 21 overlaps the fourth rotating shaft 251; to avoid exposed parts, the left and right sides of the fork plate 21 further extend downward to form a skirt 211 covering the bearing wheel frame 23 and the bearing wheel 24, and the two ends of the third rotating shaft 231 are rotatably connected to the inner wall of the skirt 211; to improve the bearing effect, there are two sets of bearing wheels 24, and the axles of these two sets of bearing wheels 24 are rotatably connected to the front and rear ends of the adapter plate 27, respectively, and the middle part of the adapter plate 27 is rotatably connected to the bearing wheel frame 23 through the seventh rotating shaft 271.

[0055] To facilitate component placement and to position the anti-tilt mechanism 30 as close as possible to the center of the transport vehicle in the front-rear direction, in this embodiment, the support base 31 is positioned close to the front end face of the vehicle body 10. This proximity means that the distance between the support base 31 and the front end face of the vehicle body 10 is less than or equal to 10 mm.

[0056] In this embodiment, the slide groove 32 extends through the support base 31 in the left-right direction. The groove edge of the slide groove 32 protrudes outward to form a boss 321. The outer side of the slider 33 protrudes 3-5mm beyond the end face of the boss 321 to avoid interference between the guide plate 34 and the support base 31. To improve the support strength of the guide plate 34, the front and rear ends of the guide plate 34 are further folded vertically towards the direction of the support base 31 to form a retaining edge 341 located on the front and rear sides of the boss 321. The retaining edge 341 is spaced apart from the boss 321. Furthermore, the anti-tilt mechanism 30 also includes a proximity switch 38 for detecting the position of the guide plate 34. The proximity switch 38 is connected to the outer wall of the support base 31 and located between the boss 321 and the retaining edge 341. When the upper end of the guide plate 34 moves upward to block the trigger position of the proximity switch 38, the proximity switch 38 is triggered.

[0057] To facilitate the connection between the slider 33 and the guide plate 34, in this embodiment, the outer side of the slider 33 is provided with an outwardly protruding positioning pin 331. The positioning pin 331 is also provided with threaded holes 332 for locking the guide plate 34 around its perimeter. The upper end of the guide plate 34 is provided with a positioning hole 342 that matches the positioning pin 331, and a bolt hole 343 that corresponds to the threaded hole 332. The guide plate 34 is locked to the outer side of the slider 33 by bolts that pass through the bolt hole 343 and are threadedly connected to the threaded hole 332. When locked, the positioning pin 331 is inserted into the positioning hole 342, and the end face of the positioning pin 331 is flush with the outer side of the guide plate 34.

[0058] To facilitate the rotation of the auxiliary wheel 35, in this embodiment, the lower end of the guide plate 34 gradually narrows inward to form a support lug 344. The axle 351 of the auxiliary wheel 35 is rotatably connected to the support lug 344, and the rotation axis of the axle 351 extends horizontally in the left-right direction.

[0059] Because the vertical sliding distance of the slider 33 needs to be precisely controlled and has a certain driving force to ensure the balance of both sides of the vehicle body 10, in this embodiment, the driving assembly adopts the form of a motor 361 and a lead screw pair. Specifically, the driving assembly includes a motor 361, a lead screw 362, and a lead screw nut 363. Specifically, the motor 361 is connected to the top of the support base 31, and the output shaft of the motor 361 passes downward through the top plate of the support base 31. The lead screw 362 extends in the vertical direction, and the upper end of the lead screw 362 is located in the slide groove 32 and connected to the output shaft of the motor 361. The lower end of the lead screw 362 passes through the bottom plate of the support base 31 and is rotatably connected to the bottom plate 31. Next, the nut 363 passes through the middle of the slider 33 and is fixedly connected to the slider 33. The nut 363 is also sleeved on the lead screw 362. When the motor 361 is activated, it can drive the lead screw 362 to rotate, so that the nut 363 moves up and down, thereby causing the slider 33 to slide up and down in the slide groove 32. In order to facilitate the control of the motor 361, the top of the motor 361 is also connected to the driver 365 and the brake 364 from top to bottom. In order to avoid the components being exposed and improve the aesthetics, in this embodiment, the anti-tilt mechanism 30 also includes an outer cover 37. The outer cover 37 is connected to the side of the main body 10 and covers the upper end of the drive assembly, the support base 31 and the guide plate 34.

[0060] For ease of use, in this embodiment, the vehicle body 10 is also equipped with a charging brush 12, a navigation laser bracket 13, a navigation laser device 14, an operating handle 15, an armrest assembly 16, a pedal assembly 17, and a safety anti-collision assembly 18. The charging brush 12 is connected to one side of the vehicle body 10 and located above the anti-rollover mechanism 30. The navigation laser bracket 13 is connected to one side of the top of the vehicle body 10 and extends vertically upward. The navigation laser device 14 is connected to the top of the navigation laser device bracket 13. The operating handle 15 is rotatably connected to the top of the vehicle body 10. The armrest assembly 16 is connected to the rear end face of the vehicle body 10 and located below the operating handle 15. The pedal assembly 17 is rotatably connected to the rear end face of the vehicle body 10 and located below the armrest assembly 16. The safety anti-collision assembly 18 is connected to the bottom of the outer wall of the vehicle body 10 and is arranged around the rear end face and left and right sides of the vehicle body 10.

[0061] The double-sided pallet handling method provided by the present invention uses the aforementioned handling vehicle for handling, and the handling method includes the following steps:

[0062] S1. Start the lifting mechanism, which drives the fourth rotating shaft and the rear end of the fork plate to move upward. When the fourth rotating shaft moves upward, the pull rod seat rotates accordingly, causing the second rotating shaft to rotate backward and downward around the fourth rotating shaft. Pull the pull rod backward, causing the pull rod to drive the load-bearing wheel frame to rotate backward and downward around the third rotating shaft, causing the load-bearing wheel frame to be lowered, causing the load-bearing wheel to press against the support surface, and causing the front end of the fork plate to move upward accordingly.

[0063] S2. When the load-bearing wheel moves up the fork plate to the point where it is about to leave the support surface, stop the lifting mechanism, start the drive assembly, and make the slider slide down, thereby driving the guide plate to move down.

[0064] S3. When the auxiliary wheel contacts and supports the support surface, stop the drive assembly and start the lifting mechanism to move the fork plate upwards.

[0065] S4. When the fork plate is moved to be aligned with the slot opening on the side of the double-sided pallet, stop the lifting mechanism, start the lifting unit, so that the sixth rotating axis moves upward, drives the swing arm to swing, and pulls the pull rod seat to rotate through the fifth rotating axis, so that the second rotating axis rotates forward and upward around the fourth rotating axis, pushes the pull rod forward, so that the pull rod drives the load-bearing wheel frame to rotate forward and upward around the third rotating axis, so that the load-bearing wheel frame retracts.

[0066] S5. After the load-bearing wheel frame is fully retracted, move the vehicle body so that the forks are inserted into the slots of the double-sided pallet;

[0067] S6. After the forks are fully inserted into the slots and the load-bearing wheel frame extends out of the double-sided pallet, start the lifting mechanism to lift the double-sided pallet with the forks;

[0068] S7. After the double-sided pallet is fully lifted, stop the lifting mechanism, move the vehicle body, and transport the double-sided pallet to the preset position;

[0069] S8. Start the lifting mechanism to drive the fourth rotating shaft and the rear end of the fork plate to move downwards, so that the bearing wheel contacts and supports the support surface;

[0070] S9. When the double-sided pallet is completely placed on the support surface, stop the lifting mechanism, start the lifting unit, so that the sixth rotating axis moves upward, drives the swing arm to swing, and pulls the tie rod seat to rotate through the fifth rotating axis, so that the second rotating axis rotates forward and upward around the fourth rotating axis, pushes the tie rod forward, so that the tie rod drives the load-bearing wheel frame to rotate forward and upward around the third rotating axis, so that the load-bearing wheel frame retracts.

[0071] S10. Move the vehicle body to smoothly detach the forks from the double-sided pallet, completing the double-sided pallet handling operation.

[0072] The advantage of this design is that when the load-bearing wheel is about to detach from the support surface, the guide plate is driven down by the slider, so that the auxiliary wheel is supported on the support surface to form lateral support, which can ensure the stability of the handling operation. At the same time, when the load-bearing wheel frame is suspended and lowered, the sixth rotating shaft can be moved up by the lifting unit to push the load-bearing wheel frame forward and retract it, which can reduce the thickness of the front end of the forks and make it easier for them to be inserted into the slot opening on the side of the double-sided pallet. The steps are few, the operation is simple, and the effect is direct.

[0073] It should be noted that in this invention, the first to seventh rotating shafts all extend horizontally in the left and right direction. The lifting mechanism needs to bear load and has a large output force, which can be achieved by hydraulic drive, electric drive, or a combination of hydraulic and electric drive. The lifting unit does not need to bear load, has a small output force, and has position requirements, which can be achieved by using a servo motor and a lead screw pair.

[0074] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A pallet truck with double-sided pallet handling function, comprising: A movable vehicle body; The forks are located at the front end of the vehicle body. The forks include fork plates, tie rods, a load-bearing wheel frame, a load-bearing wheel, and a tie rod seat. The tie rod extends in a front-rear direction and is located below the fork plates. The front end of the tie rod is rotatably connected to the load-bearing wheel frame via a first rotating shaft, and the rear end of the tie rod is rotatably connected to the tie rod seat via a second rotating shaft. The load-bearing wheel frame is rotatably connected to the front end of the fork plates via a third rotating shaft. The third rotating shaft is located behind the first rotating shaft and higher than the tie rod. The load-bearing wheel is rotatably connected to the load-bearing wheel frame and is located in front of the first rotating shaft and the third rotating shaft. The tie rod seat is connected to a lifting mechanism via a vertically movable fourth rotating shaft. When the lifting mechanism is activated, it can drive the fourth rotating shaft and the rear end of the fork plates to move vertically. Anti-rollover mechanisms are installed on both sides of the vehicle body; Its features are: The fork also includes a swing arm located above the pull rod seat. The swing arm is rotatably connected to the pull rod seat via a fifth rotating shaft and connected to the lifting unit via a sixth rotating shaft that can move up and down. The fifth rotating shaft is located below and in front of the sixth rotating shaft and is higher than the second and fourth rotating shafts. When the lifting unit operates, it can drive the sixth rotating shaft to move upward, thereby causing the swing arm to swing. The fifth rotating shaft pulls the pull rod seat to rotate around the fourth rotating shaft, causing the pull rod to push the load-bearing wheel frame forward and upward under the drive of the second rotating shaft. This causes the load-bearing wheel frame to rotate forward and upward around the third rotating shaft, thus achieving retraction. The anti-roll mechanism includes a support base, a slide groove, a slider, a guide plate, an auxiliary wheel, and a drive assembly. The support base is an elongated strip extending in the vertical direction and is detachably fixed to the side wall of the vehicle body. The slide groove is formed in the middle of the support base and extends in the vertical direction. The slider is slidably embedded in the slide groove. The guide plate is located on the outside of the support base, and its upper end is connected to the slider. The auxiliary wheel is rotatably connected to the lower end of the guide plate. The drive assembly is used to drive the slider to slide up and down. When the drive assembly is activated, it can drive the guide plate to move up and down through the slider, causing the auxiliary wheel to disengage from or abut against the support surface.

2. The pallet truck with double-sided pallet handling function according to claim 1, characterized in that: In the front-to-back direction, the centerline of the fourth rotating shaft is flush with the centerline of the sixth rotating shaft.

3. The pallet truck with double-sided pallet handling function according to claim 1, characterized in that: The pull rod base includes two clamping plates whose projections in the left-right direction are triangular. These two clamping plates are clamped on the left and right sides of the pull rod. The second rotating shaft, the fourth rotating shaft, and the fifth rotating shaft are mounted between the two clamping plates. The second rotating shaft and the fourth rotating shaft are respectively located near the two bottom feet of the clamping plates, and the fifth rotating shaft is located near the top corner of the clamping plate.

4. The pallet truck with double-sided pallet handling function according to claim 1, characterized in that: The rear end of the fork plate overlaps the fourth rotating shaft, and the left and right sides of the fork plate extend downward to form a skirt that covers the load-bearing wheel frame and the load-bearing wheel. The two ends of the third rotating shaft are rotatably connected to the inner wall of the skirt.

5. The pallet truck with double-sided pallet handling function according to claim 1, characterized in that: There are two sets of bearing wheels, and the axles of these two sets of bearing wheels are rotatably connected to the front and rear ends of the adapter plate, respectively. The middle part of the adapter plate is rotatably connected to the bearing wheel frame through a seventh rotating shaft.

6. The pallet truck with double-sided pallet handling function according to claim 1, characterized in that: The support base is located close to the front end face of the vehicle body, and the distance between the support base and the front end face of the vehicle body is less than or equal to 10mm.

7. The pallet truck with double-sided pallet handling function according to claim 1, characterized in that: The slide groove extends through the support base in the left-right direction, and the groove edge of the slide groove protrudes outward to form a boss. The outer side of the slider protrudes from or is flush with the end face of the boss.

8. The pallet truck with double-sided pallet handling function according to claim 7, characterized in that: The front and rear ends of the guide plate are folded vertically toward the direction of the support base to form a retaining edge located on the front and rear sides of the boss, and the retaining edge is spaced apart from the boss.

9. The pallet truck with double-sided pallet handling function according to claim 8, characterized in that: The anti-tilt mechanism also includes a proximity switch for detecting the position of the guide plate. The proximity switch is connected to the outer wall of the support base and located between the boss and the stop. When the upper end of the guide plate moves upward to block the proximity switch, the proximity switch is triggered.

10. The pallet truck with double-sided pallet handling function according to claim 1, characterized in that: The slider has an outwardly protruding positioning pin in the middle of its outer side. The positioning pin is surrounded by threaded holes for locking the guide plate. The upper end of the guide plate has a positioning hole that matches the positioning pin and a bolt hole that corresponds to the threaded hole.

11. The pallet truck with double-sided pallet handling function according to claim 1, characterized in that: The lower end of the guide plate gradually tapers inward to form a support lug. The axle of the auxiliary wheel is rotatably connected to the support lug, and the rotation axis of the axle extends horizontally in the left-right direction.

12. The pallet truck with double-sided pallet handling function according to claim 1, characterized in that: The drive assembly includes a motor, a lead screw, and a lead screw nut. The motor is connected to the top of the support base, and the output shaft of the motor passes downward through the top plate of the support base. The lead screw extends in the vertical direction, with its upper end located in the slide groove and connected to the output shaft of the motor. The lower end of the lead screw passes through the bottom plate of the support base and is rotatably connected to the bottom plate. The lead screw nut passes through the middle of the slider and is fixedly connected to the slider. The lead screw nut is also sleeved on the lead screw.

13. The pallet truck with double-sided pallet handling function according to claim 12, characterized in that: The drive assembly also includes a driver and a brake connected sequentially from top to bottom to the top of the motor.

14. The pallet truck with double-sided pallet handling function according to claim 1, characterized in that: The anti-roll mechanism also includes an outer cover, which is connected to the side of the vehicle body and covers the upper end of the drive assembly, the support seat, and the guide plate.

15. The pallet truck with double-sided pallet handling function according to claim 1, characterized in that: The vehicle body is also equipped with a charging brush, a navigation laser bracket, a navigation laser device, an operating handle, an armrest assembly, a pedal assembly, and a safety anti-collision assembly. The charging brush is connected to one side of the vehicle body and located above the anti-rollover mechanism. The navigation laser bracket is connected to one side of the top of the vehicle body and extends vertically upward. The navigation laser device is connected to the top of the navigation laser device bracket. The operating handle is rotatably connected to the top of the vehicle body. The armrest assembly is connected to the rear end of the vehicle body and located below the operating handle. The pedal assembly is rotatably connected to the rear end of the vehicle body and located below the armrest assembly. The safety anti-collision assembly is connected to the bottom of the vehicle body and is arranged around the rear end and both sides of the vehicle body.

16. A method for handling double-sided pallets, comprising using a handling vehicle as described in any one of claims 1 to 15, characterized in that, The handling method includes the following steps: S1. Activate the lifting mechanism to drive the fourth rotating shaft and the rear end of the fork plate to move upward. When the fourth rotating shaft moves upward, the pull rod seat rotates accordingly, causing the second rotating shaft to rotate downward around the fourth rotating shaft, pulling the pull rod backward, causing the pull rod to drive the bearing wheel frame to rotate downward around the third rotating shaft, causing the bearing wheel frame to be lowered, causing the bearing wheel to press against the support surface, and causing the front end of the fork plate to move upward accordingly. S2. When the load-bearing wheel moves up with the fork plate to the point where it is about to leave the support surface, stop the lifting mechanism, start the drive assembly, and make the slider slide down, thereby driving the guide plate to move down; S3. When the auxiliary wheel contacts and supports the support surface, stop the drive assembly and start the lifting mechanism to move the fork plate upward. S4. When the fork plate moves to be aligned with the slot opening on the side of the double-sided pallet, stop the lifting mechanism, start the lifting unit, so that the sixth rotating axis moves upward, drives the swing arm to swing, and pulls the pull rod seat to rotate through the fifth rotating axis, so that the second rotating axis rotates forward and upward around the fourth rotating axis, pushes the pull rod forward, so that the pull rod drives the load-bearing wheel frame to rotate forward and upward around the third rotating axis, so that the load-bearing wheel frame retracts; S5. After the load-bearing wheel frame is fully retracted, move the vehicle body so that the forks are inserted into the slots of the double-sided pallet; S6. After the forks are fully inserted into the slots and the load-bearing wheel frame extends out of the double-sided pallet, the lifting mechanism is activated to lift the double-sided pallet with the forks; S7. After the double-sided pallet is fully lifted, stop the lifting mechanism, move the vehicle body, and transport the double-sided pallet to the preset position; S8. Activate the lifting mechanism to drive the fourth rotating shaft and the rear end of the fork plate to move downward, so that the bearing wheel contacts and supports the support surface; S9. When the double-sided pallet is completely placed on the support surface, stop the lifting mechanism, start the lifting unit, so that the sixth rotating axis moves upward, drives the swing arm to swing, and pulls the pull rod seat to rotate through the fifth rotating axis, so that the second rotating axis rotates forward and upward around the fourth rotating axis, pushes the pull rod forward, and drives the load-bearing wheel frame to rotate forward and upward around the third rotating axis, so that the load-bearing wheel frame retracts. S10. Move the vehicle body so that the forks can smoothly detach from the double-sided pallet, completing the handling operation of the double-sided pallet.

Images