Electric lifting drive device for transport vehicle

Abstract

The present invention provides an electric lifting drive device for a transport vehicle. The electric lifting drive device includes a driving assembly, a connecting seat, a lifting oil cylinder, a gear pump, a battery box, a control device and a hand pull plate. The driving assembly drives the roller to roll. A countersunk hole is opened on the top of the driving assembly. A bearing is fixed on the connecting seat. The protruding cylinder of the lifting oil cylinder passes through the bearing and is fixed to the countersunk hole. The hand pull plate is fixed on the lifting oil cylinder. The gear pump is used to drive the piston rod of the lifting oil cylinder to move up and down. The control device is composed of a controller and an accelerator. The accelerator controls the controller to finally control the operation of the driving assembly and the gear pump. The battery box supplies power to the entire electric lifting drive device. The gear pump and the battery box are fixed to the side steel plate of the fork frame with bolts, which can effectively avoid damage caused by rigid collision. The connecting seat is connected and fixed to the U-shaped bracket through a pin. After adopting the above structure, not only the purpose of waste utilization is achieved, but also the labor intensity can be reduced.

Description

Technical Field

[0001] The invention relates to a transport vehicle accessory, in particular to an electric lifting drive device of a transport vehicle. Background Art

[0002] A hydraulic transport truck is a common loading and unloading and handling tool. It is a logistics handling equipment used to transport goods. When in use, the fork it carries is inserted into the hole of the pallet, and the hydraulic system is driven by manpower to realize the lifting and lowering of the pallet goods, and the handling operation is completed by manpower. It is widely used in workshops, warehouses, storage, stations, docks and other occasions. The hydraulic transport truck consists of a fork frame, a U-shaped bracket, and a manual lifting device. The manual lifting device includes a main steering wheel, a steering seat, a lifting cylinder, and a hand pull plate.

[0003] In actual use, hydraulic transport trucks also have a working life. After a long period of use, the manual lifting device is easily damaged, causing the entire vehicle to be scrapped. However, the fork frame and U-shaped bracket are formed and cast from steel plates, which are strong and will not break. At the same time, since the assembly space inside the fork frame (the part where the manual lifting device is installed) is relatively narrow, in order to utilize waste, a new type of hydraulic transport truck that can be assembled with the original fork frame and U-shaped bracket continues to appear on the market. While maintaining the original functions, this hydraulic transport truck also needs to increase the electric lifting drive function, which not only achieves waste utilization and reduces costs, but also reduces labor intensity and improves cargo handling efficiency. Summary of the invention

[0004] In view of the defects of the existing hydraulic transporter locks, the technical problem to be solved by the present invention is to provide an electric lifting drive device for a transporter, wherein the electric lifting drive device is used in conjunction with a fork frame and a U-shaped bracket.

[0005] In order to achieve the above object, according to one aspect of the present invention, the present invention is implemented by the following technical measures: an electric lifting drive device for a transport vehicle, comprising:

[0006] A driving assembly, wherein a roller is provided on the driving assembly, a reducer is provided between the roller and the driving assembly, and a countersunk hole is provided on the top of the driving assembly;

[0007] A connecting seat, wherein a center hole is opened in the center of the connecting seat, and a bearing is arranged in the center hole;

[0008] A lifting oil cylinder, the lifting oil cylinder comprises an oil cylinder body, a piston hole, a piston rod, a cylinder sleeve, and a sealing member. A protruding cylinder extends from the bottom of the oil cylinder body, the protruding cylinder passes through a bearing and is fixed to a countersunk hole, the piston hole extends from the top of the oil cylinder body into the protruding cylinder but does not cut through the protruding cylinder, the cylinder sleeve is arranged in the piston hole, the piston rod is arranged in the cylinder sleeve, and an oil hole I extends upward from the bottom of the piston rod, and an oil inlet connected to the oil hole is arranged near the top of the piston rod, the sealing member is used for sealing the lifting oil cylinder, a hand pull plate is also movably fixed to the top of one side of the oil cylinder body, and an oil hole II connected to the cylinder sleeve is also arranged on the oil cylinder body;

[0009] A gear pump, wherein an oil outlet is provided at the upper end of the gear pump and an oil return port is provided at the lower end. The oil outlet is connected to the oil inlet of the lifting cylinder through an oil inlet pipe, and the oil return port is connected to the oil hole II on the cylinder body through the oil return pipe. A one-way valve is provided on the oil inlet pipe, and a relief valve and a cone valve are connected in parallel on the return pipe. The cone valve is connected to a pressure relief wrench provided on the hand pull plate;

[0010] A battery box, wherein the battery box supplies power to the electric lifting drive device;

[0011] The control device includes a controller and an accelerator. The accelerator is provided with a lifting switch, a forward / reverse switch and an emergency stop switch. The accelerator is arranged on a hand pull plate, and the accelerator is connected to the controller through a line, so that the controller can drive the gear pump and the drive assembly.

[0012] The electric lifting drive device of the transport vehicle controls the controller through the accelerator, so that the controller controls the driving assembly or the gear pump to operate, the driving assembly drives the fork frame to move forward and backward, the lifting cylinder drives the connecting seat to move up and down, so that the U-shaped bracket fixed on the connecting seat is raised and lowered, and finally drives the fork connected to the U-shaped bracket to be raised and lowered.

[0013] Furthermore, the drive assembly adopts a brushless DC permanent magnet motor, and the roller is a PU polyurethane wheel.

[0014] Furthermore, the bottom surface of the protruding cylinder is an arc surface. The above design is convenient for plugging into the countersunk hole of the drive assembly.

[0015] Furthermore, the piston rod has a through hole which runs horizontally through the piston rod near the bottom. The above design is to enable the incoming hydraulic oil to flow into the bottom quickly and evenly.

[0016] Furthermore, the seal includes two wear-resistant rings, a Y-shaped seal ring and two O-rings, and the cylinder sleeve has five grooves from top to bottom. The first and third grooves at the top are used to fix the two wear-resistant rings, which are in contact with the piston rod to prevent scratches caused by contact with the metal inner wall of the lifting cylinder. The second groove is used to place the Y-shaped seal ring, and the fourth and fifth grooves are used to place the two O-rings. The above design structure is more reasonable.

[0017] Furthermore, the oil inlet pipe and the oil inlet port, and the oil return pipe and the oil hole II are all connected by threads. The above design is convenient for disassembly and assembly.

[0018] Compared with the prior art, the advantages of the present invention are that the electric lifting drive device is assembled with the original fork frame and the U-shaped bracket into a new type of electric hydraulic transport vehicle. On the basis of maintaining the original functions, the electric lifting drive function is added, which not only achieves waste utilization and reduces costs, but also reduces labor intensity and improves cargo handling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0020] Figure 1 The present invention is a schematic diagram of the parts of an electric lifting drive device of a transport vehicle.

[0021] Figure 2 It is a schematic diagram of the half-section structure of the lifting cylinder described in the present invention.

[0022] Figure 3 This is a schematic diagram of the oil circuit of the lifting cylinder and gear pump described in the present invention.

[0023] Explanation of the reference numerals in the accompanying drawings: 1. drive assembly; 2. roller; 3. countersunk hole; 4. connecting seat; 5. bearing; 6. lifting cylinder; 7. cylinder body; 8. piston hole; 9. piston rod; 10. cylinder sleeve; 11. protruding cylinder; 12. oil hole I; 13. oil inlet; 14. hand pull plate; 15. oil hole II; 16. gear pump; 17. oil outlet; 18. oil return port; 19. oil inlet pipe; 20. oil return pipe; 21. non-return valve; 22. relief valve; 23. cone valve; 24. pressure relief wrench; 25. battery box; 26. controller; 27. accelerator; 28. lifting switch; 29. ​​forward / reverse switch; 30. emergency stop switch; 31. intersecting hole; 32. wear-resistant ring; 33. Y-shaped sealing ring; 34. O-ring. DETAILED DESCRIPTION

[0024] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments. It should be noted that the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0025] In the description of the present invention, it is necessary to understand that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", "bottom", "top", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0026] Example 1

[0027] Please refer to Figure 1 The electric lifting drive device of a transport vehicle provided in this embodiment includes a driving assembly 1, a battery box 25, a controller 26, a connecting seat 4, a gear pump 16, a lifting cylinder 6, a hand pull plate 14 and an accelerator 27. The driving assembly 1 adopts a brushless DC permanent magnet motor, which is small in size, simple in structure and high in efficiency. The Hall driver is installed on the surface of the driving assembly 1 for easy maintenance. The driving assembly 1 drives the roller 2 at the bottom of the driving assembly 1 to rotate through the reducer. The roller 2 is preferably a PU polyurethane wheel. A countersunk hole 3 is opened on the top of the driving assembly 1. A set of lithium batteries is installed in the battery box 25. The battery box 25 is fixed to the side of the existing fork frame with bolts, which can Effectively avoid damage caused by rigid collision. A controller 26 is installed on the right side of the battery box 25. The lithium battery preferably has a voltage of 48v and a capacity of 10Ah. This is not only small in size but also powerful, easy to install, and has stable and reliable performance. The battery box 25 serves as the total power supply for the entire electric lifting drive device. The controller 26 serves as a control unit assembly to control the forward, backward and emergency stop of the drive assembly 1, and at the same time controls the operation of the gear pump 16. The connecting seat 4 is an elliptical mounting plate with a center hole vertically opened in the center, and a bearing 5 is fixed in the center hole. Circular holes are opened on both sides of the connecting seat 4 for assembling locking pins, so that the U-shaped bracket is installed and fixed to the connecting seat 4 through the locking pins, combined with Figure 2 and Figure 3Continuing to explain, the above-mentioned lifting cylinder 6 includes a protruding cylinder 11, a cylinder body 7, a piston hole 8, a piston rod 9, a cylinder sleeve 10, and a sealing component. The above-mentioned protruding cylinder 11 is fixed to the right side of the bottom of the cylinder body 7, and the protruding cylinder 11 passes through the bearing 5 and is interference fit with the countersunk hole 3 of the drive assembly 1. A certain thickness is milled off on both sides of the bottom of the above-mentioned protruding cylinder 11 to form an arc surface, which is convenient for plugging into the countersunk hole 3. The above-mentioned piston hole 8 is opened on the cylinder body 7 and extends from the top of the cylinder body 7 to the center of the protruding cylinder 11. The piston hole 8 does not penetrate the bottom surface of the protruding cylinder 11, so as to ensure the strength of the bottom of the protruding cylinder 11. A groove is opened on the hole wall near the top of the above-mentioned piston hole 8 for placing a dust ring to prevent dust and impurities from entering the piston hole 8. The inside of the plug hole 8 is used to place the cylinder sleeve 10. The above-mentioned piston rod 9 is inserted in the cylinder sleeve 10, and an oil hole Ⅰ12 extends upward from the bottom of the piston rod 9, and an oil inlet 13 connected to the oil hole Ⅰ12 is opened on the right side of the piston rod 9 near the top. The oil hole Ⅰ12 has an intersecting hole 31 that horizontally penetrates the piston rod 9 near the bottom. The intersecting hole 31 allows the incoming hydraulic oil to flow into the bottom quickly and evenly. The function of the above-mentioned cylinder sleeve 10 is to allow the piston rod 9 to move freely up and down without oil leakage. The cylinder sleeve 10 has five grooves from top to bottom. The first groove and the third groove at the top are used to fix two wear-resistant rings 32. The wear-resistant ring 32 contacts the piston rod 9 to prevent scratches caused by contact with the metal inner wall inside the lifting cylinder 6. The second groove is used to place A Y-shaped sealing ring 33 is placed, and the fourth groove and the fifth groove are used to place two O-rings 34. The wear-resistant ring 32, the Y-shaped sealing ring 33, and the O-ring 34 constitute a sealing member. The sealing member forms a sealed environment in the cylinder liner groove to prevent oil leakage. The cylinder body 7 is also provided with an oil hole II 15 connected to the cylinder liner 10. The oil hole II 15 is preferably located on the cylinder liner 10 between the Y-shaped sealing ring 33 and the O-ring 34. The gear pump 16 is fixed to the side of the existing fork frame. The upper end of the gear pump 16 is provided with an oil outlet 17, and the lower end is provided with an oil return port 18. The oil outlet 17 is connected to the oil inlet 13 of the lifting cylinder 6 through an oil inlet pipe 19, and the oil return port 17 is connected to the oil hole II 15 on the cylinder body 7 through an oil return pipe 20. There is a one-way valve 21. The above-mentioned oil return pipe 20 is connected in parallel with an overflow valve 22 and a cone valve 23. The above-mentioned cone valve 23 is connected to a pressure relief wrench 24 arranged on the hand pull plate 14. The above-mentioned overflow valve 22 is when the pressure in the oil return pipe 20 is too high, it will automatically overflow into the oil storage tank to play a safety protection role. The above-mentioned cone valve 23 is when it is necessary to put down the goods, pull the pressure relief wrench 24, the cone valve 23 will open synchronously, and the hydraulic oil returns to the oil storage tank, so that the hydraulic vehicle descends. As a preferred structure, the above-mentioned oil inlet pipe 19 and the oil inlet port 13 and the oil return pipe 20 and the oil hole II 15 are all connected by threads. The above-mentioned oil return pipe 20 is a rubber oil-resistant pipe. Continuing to explain, the bottom of the above-mentioned hand pull plate 14 is connected to the cylinder body 7 by a pin. The hand pull plate 14 rotates to the left.The protruding cylinder 11 of the lifting cylinder 6 is driven to rotate synchronously. Since the protruding cylinder 11 of the lifting cylinder 6 and the countersunk hole 3 on the drive assembly 1 are interference fit, the drive assembly 1 also rotates synchronously. The above-mentioned accelerator 27 is fixed on the upper part of the hand-pulled plate 14. The accelerator 27 is connected to the controller 26 through a line. The accelerator 26 is fixed with a lifting switch 28, a forward / backward switch 29, and an emergency stop switch 30. These input signals are connected to the controller 26. The lifting switch 28 controls the lifting of the lifting cylinder 6, and the forward / backward switch 29 controls the forward and backward movement of the brushless drive assembly 1. The emergency stop switch 30 is in the shape of a large arc. When it touches the human body or foreign objects, it will trigger the emergency stop signal, and the entire transporter will stop immediately to avoid accidents. When the hand-pulled plate 14 is upright, the accelerator 27 will automatically cut off the operation of the entire circuit. Only when the hand-pulled plate 14 is not in the upright position can the above-mentioned switch work normally.

[0028] The electric lifting drive device provided in this embodiment takes a 2-ton electric hydraulic transport vehicle as an example. The various components are assembled as follows: the gear pump 16 and the battery box 25 are fixed to the side steel plate of the fork frame with bolts, which can effectively avoid damage caused by rigid collision. The connecting seat 4 is connected and fixed to the U-shaped bracket through a pin. The cylinder body 7 is connected and fixed to the countersunk hole 3 on the upper part of the drive assembly 1 through its protruding cylinder 11 through the bearing 5. This assembly method greatly reduces the overall height of the electric lifting drive device and makes the structure more compact. The cylinder body 7 and the gear pump 16 are connected with an oil inlet pipe 19 and an oil return pipe 20. The upper part of the cylinder body 7 is connected to the hand pull plate 14 with a pin. A set of accelerators 27 are fixed on the hand pull plate 14. When it is necessary to transport goods, the fork frame is inserted into the pallet of the goods, the hand pull plate 14 is slightly pressed down, and the lifting switch 28 on the accelerator 27 is pressed. The gear pump 16 is After the motor is energized, it rotates, driving the gear pump 16 to rotate. The hydraulic oil enters the gear pump 16, passes through the one-way valve 21, the oil inlet pipe 19, the oil-passing bolt, and enters the bottom of the cylinder body 7 through the internal oil circuit, thereby pushing up the piston rod 9. The piston rod 9 drives the entire fork frame to lift the goods. When it is not necessary to rise, just loosen the lifting switch 28. At this time, the gear pump 16 stops working, but the hydraulic oil will not flow back due to the action of the one-way valve 21, and the original pressure can be maintained to achieve a pressure-maintaining effect. When the goods are to be put down, it is only necessary to tighten the pressure relief wrench 24 on the hand pull plate 14. The pressure relief wrench 24 opens the cone valve 23 through a mechanical structure, and the fork frame slowly descends to put the goods down. When the forward switch is pressed, the drive assembly 1 rotates forward, driving the roller 2 to rotate forward, and the electric hydraulic transporter moves forward. When the reverse switch is pressed, the drive assembly 1 reverses, driving the roller 2 to reverse, and the electric hydraulic transporter moves backward.

[0029] After adopting the above structure, the electric lifting drive device provided in this embodiment can be assembled with the original fork frame and U-shaped bracket to form a new type of electric hydraulic transport vehicle. On the basis of maintaining the original functions, the electric lifting drive function is added, which not only achieves waste utilization and reduces costs, but also reduces labor intensity and improves cargo handling efficiency.

[0030] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electric lifting drive device for a transport vehicle, characterized in that: include: A driving assembly, wherein a roller is provided on the driving assembly, a reducer is provided between the roller and the driving assembly, and a countersunk hole is provided on the top of the driving assembly; A connecting seat, wherein a center hole is opened in the center of the connecting seat, and a bearing is arranged in the center hole; A lifting oil cylinder, which comprises an oil cylinder body, a piston hole, a piston rod, a cylinder sleeve, and a sealing member. A protruding cylinder extends from the bottom of the oil cylinder body, and the bottom surface of the protruding cylinder is an arc surface. The protruding cylinder passes through a bearing and is fixed with a countersunk hole. The piston hole extends from the top of the oil cylinder body into the protruding cylinder but does not cut through the protruding cylinder. The cylinder sleeve is arranged in the piston hole, and the piston rod is arranged in the cylinder sleeve. A horizontal intersecting hole that penetrates the piston rod is opened near the bottom of the piston rod. An oil hole I extends upward from the bottom of the piston rod, and a hole connected to the oil hole is provided near the top of the piston rod. The oil inlet is connected to the oil cylinder body, the seal is used for sealing the lifting oil cylinder, a hand-pulled plate is also movably fixed on the top of one side of the oil cylinder body, and the oil cylinder body is also provided with an oil hole II connected to the cylinder sleeve, the seal includes two wear-resistant rings, a Y-shaped sealing ring and two O-rings, and the cylinder sleeve has five grooves from top to bottom. The first and third grooves at the top are used to fix the two wear-resistant rings, and the wear-resistant rings are in contact with the piston rod to prevent scratches caused by contact with the metal inner wall of the lifting oil cylinder, the second groove is used to place the Y-shaped sealing ring, and the fourth and fifth grooves are used to place two O-rings; A gear pump, wherein an oil outlet is provided at the upper end of the gear pump and an oil return port is provided at the lower end. The oil outlet is connected to the oil inlet of the lifting cylinder through an oil inlet pipe, and the oil return port is connected to the oil hole II on the cylinder body through an oil return pipe. A one-way valve is provided on the oil inlet pipe, and a relief valve and a cone valve are connected in parallel on the oil return pipe. The cone valve is connected to a pressure relief wrench provided on the hand pull plate; A battery box, wherein the battery box supplies power to the electric lifting drive device; The control device includes a controller and an accelerator. The accelerator is provided with a lifting switch, a forward / reverse switch and an emergency stop switch. The accelerator is arranged on a hand pull plate, and the accelerator is connected to the controller through a line, so that the controller can drive the gear pump and the drive assembly.

2. The electric lifting drive device of a transport vehicle according to claim 1, characterized in that: The driving assembly adopts a brushless DC permanent magnet motor, and the roller is a PU polyurethane wheel.

3. The electric lifting drive device of a transport vehicle according to claim 1, characterized in that: The oil inlet pipe and the oil inlet port as well as the oil return pipe and the oil through hole II are all connected by threads.

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