Forklift hydraulic driving device

Abstract

The invention belongs to the technical field of forklift steering control, and discloses a forklift hydraulic driving device which comprises a driving support, a stabilizing mechanism is fixedly mounted in the driving support, an oil pump is fixedly mounted at the top of the stabilizing mechanism, and a partition valve is fixedly mounted in the oil pump. The two sides of the oil pump are fixedly connected with hydraulic driving devices. Oil in a hydraulic oil tank is sucked into an oil pump through a hose, then the oil pump pumps the sucked oil into a piece valve, then an external controller sends a signal to enable the piece valve to control hydraulic driving devices on the two sides through the oil pump, and then the hydraulic driving devices are controlled by the piece valve to do telescopic motion; when the hydraulic driving device does telescopic motion, the connecting mechanism drives the fixed connecting block to enable the rotating shaft to deflect in direction, and compared with a traditional device, the device has the advantages that the power advantage of the hydraulic driving device can be fully exerted to steer through effective control of an oil pump and a partition valve.

Description

Technical Field

[0001] The invention belongs to the technical field of forklift steering control, and in particular relates to a forklift hydraulic drive device. Background Art

[0002] As an important logistics handling equipment, forklifts are widely used in modern industry and warehousing. Their hydraulic drive devices have emerged to meet the needs of efficient and precise operations. Traditional mechanical transmission is difficult to achieve complex movements and has limited power transmission. Hydraulic drive has taken the lead with its unique advantages. It can convert the mechanical energy of the engine or motor into hydraulic energy, and then convert it into mechanical energy through actuators such as cylinders and motors, so as to achieve diversified actions such as smooth lifting, lowering, gantry tilting and vehicle steering without affecting the goods, which greatly improves the working performance and adaptability of the forklift's driving wheels. The existing forklift hydraulic drive device generally has a delayed response during the use of the steering wheel, and the stability is not high. In addition, due to the single connection between the components, it is not easy to locate the fault point and reduce the difficulty and cost of maintenance, so it needs to be improved and optimized. Summary of the invention

[0003] The object of the present invention is to provide a forklift hydraulic drive device to solve the problems raised in the above background technology.

[0004] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a forklift hydraulic drive device, comprising a drive bracket, a stabilizing mechanism is fixedly installed inside the drive bracket, an oil pump is fixedly installed on the top of the stabilizing mechanism, a segmentation valve is fixedly installed inside the oil pump, hydraulic drive devices are fixedly connected on both sides of the oil pump, connecting mechanisms are rotatably installed on the upper and lower ends of the hydraulic drive device, a hose is fixedly connected to the outer surface of the oil pump, a hydraulic oil tank is fixedly installed on the other end of the hose, fixed frames are rotatably installed on both sides of the top of the drive bracket, rotating shafts are fixedly installed on both sides of the fixed frame, rubber wheels are fixedly sleeved on the outer sides of the rotating shafts, fixed connecting blocks are fixedly installed on the inner and outer surfaces of the rotating shafts, and the connecting mechanism is rotatably connected to the fixed connecting blocks.

[0005] Preferably, the stabilizing mechanism includes a first fixed block fixedly installed on both sides of the inner part of the driving bracket, a second fixed block fixedly installed on both sides of the inner part of the driving bracket, a fixed rod fixedly installed between the first fixed block and the second fixed block, a sliding plate slidably installed on the outer surface of the fixed rod, a spring movably sleeved between the sliding plate and the second fixed block, and one end of the spring is fixedly connected to the inner wall of the second fixed block and the other end is fixedly connected to the inner wall of the sliding plate, a first rotating rod is rotatably installed between the extension blocks on the top of the sliding plate, a connecting plate is fixedly sleeved on the outer surface of the first rotating rod, a bottom plate is fixedly installed inside the driving bracket and is located between the two second fixed blocks, a telescopic rod is fixedly installed on the top of the bottom plate, an oil pump frame is fixedly installed on the top of the telescopic rod, a group of third fixed blocks are fixedly installed on both sides of the oil pump frame, and each group of third fixed blocks has two, a second rotating rod is rotatably installed between the two third fixed blocks, and the connecting plate is fixedly sleeved on the second rotating rod and the first rotating rod, and an oil pump is fixedly installed on the top of the oil pump frame.

[0006] Preferably, the connecting mechanism includes a hydraulic drive device with first fixing pins rotatably installed on both sides, and the fixed connecting block with second fixing pins rotatably installed on both sides. The two second fixing pins and the first fixing pin are fixedly sleeved with a connecting plate. The outer surfaces of the second fixing pin and the first fixing pin are fixedly sleeved with a second magnetic ring, and one is located between the hydraulic drive device and the connecting plate, and the other is located between the fixed connecting block and the connecting plate. The outer surfaces of the first fixing pin and the second fixing pin are movably sleeved with a second rubber ring and are located on the side of the second magnetic ring. The outer surfaces of the first fixing pin and the second fixing pin are movably sleeved with the first magnetic ring, and the first magnetic ring is located on the side of the second rubber ring.

[0007] Preferably, a telescopic rod is fixedly mounted on the top of the bottom plate, and a first rubber ring is movably sleeved on the outer surface of the telescopic rod, and the first rubber ring is in a circular ring shape with equal width at the top and the bottom.

[0008] Preferably, a second rubber ring is movably sleeved on the outer surfaces of the first fixing pin and the second fixing pin, and the second rubber ring is located between the first magnetic ring and the second magnetic ring.

[0009] Preferably, a first rotating rod is rotatably mounted between the extending blocks on both sides of the top of the sliding plate, a second rotating rod is rotatably mounted between the two third fixed blocks, and the connecting plate is fixedly sleeved on the outer surfaces of the second rotating rod and the first rotating rod.

[0010] Preferably, an oil pump frame is fixedly mounted on the top of the telescopic rod, and the oil pump frame is arc-shaped and just wraps the oil pump.

[0011] Preferably, rotating shafts are fixedly mounted on both sides of the fixing frame, and the rotating shafts are circular with equal sizes at the top and bottom, and rubber wheels are fixedly sleeved on the outer sides of the rotating shafts.

[0012] The beneficial effects of the present invention are as follows: 1. The present invention uses an oil pump to suck the oil inside the hydraulic oil tank into the oil pump through a hose, and then the oil pump pumps the sucked oil into the slicing valve, and then sends a signal through an external controller to make the slicing valve control the hydraulic drive devices on both sides through the oil pump, and then the hydraulic drive device will be controlled by the slicing valve to perform telescopic movement. When the hydraulic drive device performs telescopic movement, the connecting mechanism will drive the fixed connecting block to cause the rotating shaft to deflect in direction, thereby realizing the steering of the rubber wheel. Compared with the traditional device, the present device can give full play to the power advantage of the hydraulic drive device for steering through the effective control of the oil pump and the slicing valve, and at the same time, there will be no delay in the response like the traditional steering wheel, and the present device has good system stability. In addition, since the functions of each component are relatively independent and interrelated, the fault point can be located more conveniently, reducing the difficulty and cost of maintenance.

[0013] 2. The present invention uses the third fixed blocks on both sides to rotate the second rotating rod and at the same time the connecting plate will be subjected to a downward force. When the connecting plate is subjected to the downward force, the first rotating rod will rotate, and at the same time it will push the sliding plate to slide inward to squeeze the spring. Then, due to the elastic recovery effect of the spring, the acting force is evenly dispersed and the elastic deformation of the spring is within an acceptable range, thereby achieving stable protection for the oil pump. Compared with traditional devices, this device can effectively reduce the damage to the oil pump caused by these vibrations, thereby extending the service life of the oil pump, reducing problems such as loose connection and seal failure caused by vibration, improving the reliability of the entire hydraulic drive device, and reducing maintenance costs and maintenance frequency.

[0014] 3. The present invention drives the connecting plates on the upper and lower sides to deflect when the first fixing pins on the upper and lower sides are deflected, and drives the second fixing pins on the upper and lower sides to deflect at an angle when the connecting plates are deflected, and drives the fixed connecting blocks to deflect when the second fixing pins on the upper and lower sides are deflected at an angle, and moves slightly up and down while deflecting. At this time, due to the repulsive force between the first magnetic ring and the second magnetic ring, there will be a reserved moving space between the two connecting plates. Compared with traditional devices, this device can greatly reduce the chance of friction through non-contact design, thereby effectively reducing the degree of wear, extending the service life of the connecting parts, and improving steering flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the front three-dimensional appearance structure of the present invention; Figure 2 This is a schematic diagram of the structure of the oil pump of the present invention; Figure 3 This is a schematic diagram of the structure of the slicing valve of the present invention; Figure 4 This is a schematic diagram of the structure of the driving bracket of the present invention; Figure 5 It is a schematic diagram of the spring structure of the present invention; Figure 6 This is a schematic diagram of the oil pump frame structure of the present invention; Figure 7 This is a schematic diagram of the structure of the first magnetic ring diagram of the present invention.

[0016] In the figure: 1. drive bracket; 2. oil pump; 3. hose; 4. hydraulic oil tank; 5. hydraulic drive device; 6. segment valve; 7. first fixed block; 8. fixed rod; 9. sliding plate; 10. connecting plate; 11. first rotating rod; 12. spring; 13. second fixed block; 14. third fixed block; 15. oil pump bracket; 16. bottom plate; 17. telescopic rod; 18. first rubber ring; 19. second rotating rod; 20. first fixing pin; 21. connecting plate; 22. second fixing pin; 23. fixed connecting block; 24. first magnetic ring; 25. second rubber ring; 26. second magnetic ring; 27. fixing bracket; 28. rotating shaft; 29. ​​rubber wheel. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] like Figures 1 to 7 As shown, an embodiment of the present invention provides a forklift hydraulic drive device, including a drive bracket 1, a stabilizing mechanism is fixedly installed inside the drive bracket 1, an oil pump 2 is fixedly installed on the top of the stabilizing mechanism, a segmentation valve 6 is fixedly installed inside the oil pump 2, hydraulic drive devices 5 are fixedly connected to both sides of the oil pump 2, and connecting mechanisms are rotatably installed on the upper and lower ends of the hydraulic drive device 5, a hose 3 is fixedly connected to the outer surface of the oil pump 2, and a hydraulic oil tank 4 is fixedly installed on the other end of the hose 3, fixed frames 27 are rotatably installed on both sides of the top of the drive bracket 1, and rotating shafts 28 are fixedly installed on both sides of the fixed frame 27, and rubber wheels 29 are fixedly sleeved on the outer sides of the rotating shaft 28, and a fixed connecting block 23 is fixedly installed on the inner outer surface of the rotating shaft 28, and the connecting mechanism is rotatably connected to it.

[0019] When the staff needs to drive the forklift to turn, the external controller is used to make the oil pump 2 suck the oil inside the hydraulic oil tank 4 into the oil pump 2 through the hose 3, and then the oil pump 2 pumps the sucked oil into the segmentation valve 6. After that, the external controller sends a signal to make the segmentation valve 6 control the hydraulic drive devices 5 on both sides through the oil pump 2, and then the hydraulic drive devices 5 will be controlled by the segmentation valve 6 to perform telescopic movement. When the hydraulic drive device 5 performs telescopic movement, the connecting mechanism will drive the fixed connecting block 23 to cause the rotating shaft 28 to deflect in direction, thereby realizing the steering of the rubber wheel 29.

[0020] The oil in the hydraulic oil tank 4 is sucked into the oil pump 2 through the hose 3 by the oil pump 2, and then the oil pump 2 pumps the sucked oil into the segmentation valve 6, and then a signal is sent through the external controller to make the segmentation valve 6 control the hydraulic drive devices 5 on both sides through the oil pump 2, and then the hydraulic drive devices 5 will be controlled by the segmentation valve 6 to perform telescopic movement. When the hydraulic drive device 5 performs telescopic movement, the connecting mechanism will drive the fixed connecting block 23 to make the rotating shaft 28 deflect in direction, thereby realizing the steering of the rubber wheel 29. Compared with the traditional device, this device can give full play to the power advantage of the hydraulic drive device 5 for steering through the effective control of the oil pump 2 and the segmentation valve 6, and at the same time, there will be no delay in response like the traditional steering wheel, and the system stability of this device is good. In addition, since the functions of each component are relatively independent and interrelated, the fault point can be located more conveniently, reducing the difficulty and cost of maintenance.

[0021] The stabilizing mechanism includes a first fixed block 7 fixedly installed on both left and right sides of the driving bracket 1, a second fixed block 13 fixedly installed on both left and right sides of the driving bracket 1, a fixed rod 8 fixedly installed between the first fixed block 7 and the second fixed block 13, a sliding plate 9 slidably installed on the outer surface of the fixed rod 8, a spring 12 movably sleeved between the sliding plate 9 and the second fixed block 13, and one end of the spring 12 is fixedly connected to the inner wall of the second fixed block 13 and the other end is fixedly connected to the inner wall of the sliding plate 9, and a first rotating rod 11 is rotatably installed between the two side extension blocks on the top of the sliding plate 9, A connecting plate 10 is fixedly sleeved on the outer surface of the first rotating rod 11, a bottom plate 16 is fixedly installed inside the driving bracket 1 and is located between the two second fixed blocks 13, a telescopic rod 17 is fixedly installed on the top of the bottom plate 16, an oil pump frame 15 is fixedly installed on the top of the telescopic rod 17, a group of third fixed blocks 14 are fixedly installed on the left and right sides of the oil pump frame 15, and each group of third fixed blocks 14 has two, a second rotating rod 19 is rotatably installed between the two third fixed blocks 14, and the connecting plate 10 is fixedly sleeved on the second rotating rod 19 and the first rotating rod 11, and an oil pump 2 is fixedly installed on the top of the oil pump frame 15.

[0022] When the shaking frequency is too high during the transportation of goods, the oil pump 2 may be easily damaged. At this time, when the oil pump 2 shakes violently, the oil pump 2 will transmit the force to the oil pump frame 15, and then the oil pump frame 15 will transmit the force to the third fixed blocks 14 on both sides. Then, the third fixed blocks 14 on both sides will cause the second rotating rod 19 to rotate and the connecting plate 10 will be subjected to a downward force. When the connecting plate 10 is subjected to a downward force, the first rotating rod 11 will rotate, and at the same time, the sliding plate 9 will be pushed to slide inward to squeeze the spring 12. Then, due to the elastic recovery effect of the spring 12, the force can be evenly dispersed and the elastic deformation of the spring 12 is within an acceptable range, thereby achieving stable protection for the oil pump 2.

[0023] The second rotating rod 19 will be rotated through the third fixed blocks 14 on both sides, and the connecting plate 10 will be subjected to a downward force. When the connecting plate 10 is subjected to the downward force, the first rotating rod 11 will be rotated, and the sliding plate 9 will be pushed to slide inward to squeeze the spring 12. Then, due to the elastic recovery effect of the spring 12, the acting force is evenly dispersed and the elastic deformation of the spring 12 is within an acceptable range, thereby achieving stable protection for the oil pump 2. Compared with traditional devices, this device can effectively reduce the damage to the oil pump 2 caused by these vibrations, thereby extending the service life of the oil pump 2, reducing problems such as loose connection and sealing failure caused by vibration, improving the reliability of the entire hydraulic drive device 5, and reducing maintenance costs and maintenance frequency.

[0024] Among them, the connecting mechanism includes a first fixing pin 20 rotatably installed on the upper and lower sides of the hydraulic drive device 5, a second fixing pin 22 rotatably installed on the upper and lower sides of the fixed connection block 23, two second fixing pins 22 and the first fixing pin 20 are fixedly sleeved with a connecting piece 21, the second fixing pin 22 and the first fixing pin 20 are fixedly sleeved with a second magnetic ring 26 on the outer surfaces, and one is located between the hydraulic drive device 5 and the connecting piece 21, and the other is located between the fixed connection block 23 and the connecting piece 21, the outer surfaces of the first fixing pin 20 and the second fixing pin 22 are movably sleeved with a second rubber ring 25 and are located on the side of the second magnetic ring 26, and the outer surfaces of the first fixing pin 20 and the second fixing pin 22 are movably sleeved with a first magnetic ring 24 and the first magnetic ring 24 is located on the side of the second rubber ring 25.

[0025] When the hydraulic drive device 5 performs telescopic movement, it will drive the first fixed pins 20 on the upper and lower sides to rotate at an angle. When the first fixed pins 20 on the upper and lower sides are deflected, it will drive the connecting plates 21 on the upper and lower sides. When the connecting plates 21 are deflected, the second fixed pins 22 on the upper and lower sides will be driven to deflect at an angle. When the second fixed pins 22 on the upper and lower sides are deflected at an angle, the fixed connecting block 23 will be driven to deflect. At the same time, it will move slightly up and down while deflecting. At this time, due to the repulsive force between the first magnetic ring 24 and the second magnetic ring 26, there will be a reserved moving space between the two connecting plates 21, thereby reducing wear during deflection.

[0026] When the first fixing pins 20 on the upper and lower sides are deflected, the connecting pieces 21 on the upper and lower sides will be driven; when the connecting piece 21 is deflected, the second fixing pins 22 on the upper and lower sides will be driven to deflect at an angle; when the second fixing pins 22 on the upper and lower sides are deflected at an angle, the fixed connecting block 23 will be driven to deflect, and will move slightly up and down while deflecting. At this time, due to the repulsive force between the first magnetic ring 24 and the second magnetic ring 26, there will be a reserved moving space between the two connecting pieces 21. Compared with traditional devices, this device can greatly reduce the chance of friction through a non-contact design, thereby effectively reducing the degree of wear, extending the service life of the connecting components, and improving steering flexibility.

[0027] A telescopic rod 17 is fixedly mounted on the top of the bottom plate 16 , and a first rubber ring 18 is movably sleeved on the outer surface of the telescopic rod 17 . The first rubber ring 18 is in a circular ring shape with equal width at the top and the bottom.

[0028] The first rubber ring 18 is movably sleeved on the outer surface of the telescopic rod 17 and the first rubber ring 18 is in a circular ring shape with equal width at the top and bottom, which can effectively assist the spring 12 in assisting in unloading the force generated by vibration.

[0029] The second rubber ring 25 is movably sleeved on the outer surfaces of the first fixing pin 20 and the second fixing pin 22 , and the second rubber ring 25 is located between the first magnetic ring 24 and the second magnetic ring 26 .

[0030] Since the second rubber ring 25 is located between the first magnetic ring 24 and the second magnetic ring 26 , damage can be avoided when the acting force generated instantly on the second rubber ring 25 and the second magnetic ring 26 is greater than the repulsive force.

[0031] Among them, a first rotating rod 11 is rotatably installed between the two side extension blocks on the top of the sliding plate 9, a second rotating rod 19 is rotatably installed between the two third fixed blocks 14, and the connecting plate 10 is fixedly sleeved on the outer surfaces of the second rotating rod 19 and the first rotating rod 11.

[0032] By fixing the connecting plate 10 on the outer surfaces of the second rotating rod 19 and the first rotating rod 11, it is possible to effectively provide a rotation support for transmitting force downward when the connecting plate 10 is subjected to a force.

[0033] The top of the telescopic rod 17 is fixedly mounted with an oil pump frame 15 , and the oil pump frame 15 is arc-shaped and just wraps around the oil pump 2 .

[0034] The oil pump frame 15 is in an arc shape and just wraps around the oil pump 2 , so that when the oil pump 2 vibrates violently, the force can be evenly transmitted downward through the oil pump frame 15 , thereby avoiding the occurrence of uneven transmission.

[0035] The two sides of the fixing frame 27 are fixedly mounted with rotating shafts 28 , and the rotating shafts 28 are circular in shape with equal sizes at the top and bottom. Rubber wheels 29 are fixedly sleeved on the outer sides of the rotating shafts 28 .

[0036] The rotating shaft 28 is in a circular shape with equal size at the top and bottom, so that it can be tightly fitted with the rubber wheel 29, thereby enhancing the stability of the entire device.

[0037] Working principle and usage process: When the staff needs to drive the forklift to turn, the external controller is used to make the oil pump 2 suck the oil inside the hydraulic oil tank 4 into the oil pump 2 through the hose 3, and then the oil pump 2 pumps the sucked oil into the segmentation valve 6. After that, the external controller sends a signal to make the segmentation valve 6 control the hydraulic drive devices 5 on both sides through the oil pump 2, and then the hydraulic drive devices 5 will be controlled by the segmentation valve 6 to perform telescopic movement. When the hydraulic drive device 5 performs telescopic movement, the connecting mechanism will drive the fixed connecting block 23 to cause the rotating shaft 28 to deflect in direction, thereby realizing the steering of the rubber wheel 29.

[0038] When the shaking frequency is too high during the transportation of goods, the oil pump 2 may be easily damaged. At this time, when the oil pump 2 shakes violently, the oil pump 2 will transmit the force to the oil pump frame 15, and then the oil pump frame 15 will transmit the force to the third fixed blocks 14 on both sides. Then, the third fixed blocks 14 on both sides will cause the second rotating rod 19 to rotate and the connecting plate 10 will be subjected to a downward force. When the connecting plate 10 is subjected to a downward force, the first rotating rod 11 will rotate, and at the same time, the sliding plate 9 will be pushed to slide inward to squeeze the spring 12. Then, due to the elastic recovery effect of the spring 12, the force can be evenly dispersed and the elastic deformation of the spring 12 is within an acceptable range, thereby achieving stable protection for the oil pump 2.

[0039] When the hydraulic drive device 5 performs telescopic movement, it will drive the first fixed pins 20 on the upper and lower sides to rotate at an angle. When the first fixed pins 20 on the upper and lower sides are deflected, it will drive the connecting plates 21 on the upper and lower sides. When the connecting plates 21 are deflected, the second fixed pins 22 on the upper and lower sides will be driven to deflect at an angle. When the second fixed pins 22 on the upper and lower sides are deflected at an angle, the fixed connecting block 23 will be driven to deflect. At the same time, it will move slightly up and down while deflecting. At this time, due to the repulsive force between the first magnetic ring 24 and the second magnetic ring 26, there will be a reserved moving space between the two connecting plates 21, thereby reducing wear during deflection.

[0040] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A forklift hydraulic drive device, comprising a drive bracket (1), characterized in that: A stabilizing mechanism is fixedly installed inside the driving bracket (1), an oil pump (2) is fixedly installed on the top of the stabilizing mechanism, a slicing valve (6) is fixedly installed inside the oil pump (2), a hydraulic driving device (5) is fixedly connected to both sides of the oil pump (2), a connecting mechanism is rotatably installed on the upper and lower ends of the hydraulic driving device (5), a hose (3) is fixedly connected to the outer surface of the oil pump (2), a hydraulic oil tank (4) is fixedly installed on the other end of the hose (3), a fixing frame (27) is rotatably installed on both sides of the top of the driving bracket (1), a rotating shaft (28) is fixedly installed on both sides of the fixing frame (27), a rubber wheel (29) is fixedly sleeved on the outer side of the rotating shaft (28), a fixed connecting block (23) is fixedly installed on the inner outer surface of the rotating shaft (28), and the connecting mechanism is rotatably connected to the fixed connecting block.

2. A forklift hydraulic drive device according to claim 1, characterized in that: The stabilizing mechanism comprises a first fixing block (7) fixedly installed on both left and right sides of the interior of the driving bracket (1), a second fixing block (13) fixedly installed on both left and right sides of the interior of the driving bracket (1), a fixing rod (8) fixedly installed between the first fixing block (7) and the second fixing block (13), a sliding plate (9) slidably installed on the outer surface of the fixing rod (8), a spring (12) movably sleeved between the sliding plate (9) and the second fixing block (13), one end of the spring (12) is fixedly connected to the inner wall of the second fixing block (13) and the other end is fixedly connected to the inner wall of the sliding plate (9), a first rotating rod (11) is rotatably installed between the two side extension blocks on the top of the sliding plate (9), and the first rotating rod (11) is rotatably installed between the two side extension blocks on the top of the sliding plate (9), and the first rotating rod (11) is rotatably installed between the two side extension blocks on the top of the sliding plate (9). A connecting plate (10) is fixedly sleeved on the outer surface of the rotating rod (11); a bottom plate (16) is fixedly installed inside the driving bracket (1) and is located between the two second fixed blocks (13); a telescopic rod (17) is fixedly installed on the top of the bottom plate (16); an oil pump frame (15) is fixedly installed on the top of the telescopic rod (17); a group of third fixed blocks (14) are fixedly installed on both left and right sides of the oil pump frame (15), and each group of third fixed blocks (14) has two; a second rotating rod (19) is rotatably installed between the two third fixed blocks (14); the connecting plate (10) is fixedly sleeved on the second rotating rod (19) and the first rotating rod (11); and an oil pump (2) is fixedly installed on the top of the oil pump frame (15).

3. A forklift hydraulic drive device according to claim 1, characterized in that: The connection mechanism comprises a first fixing pin (20) rotatably mounted on both upper and lower sides of the hydraulic drive device (5), a second fixing pin (22) rotatably mounted on both upper and lower sides of the fixed connection block (23), two second fixing pins (22) and the first fixing pin (20) being fixedly sleeved with a connecting plate (21), a second magnetic ring (26) being fixedly sleeved on the outer surfaces of the second fixing pin (22) and the first fixing pin (20), one of which is located between the hydraulic drive device (5) and the connecting plate (21) and the other of which is located between the fixed connection block (23) and the connecting plate (21), a second rubber ring (25) being movably sleeved on the outer surfaces of the first fixing pin (20) and the second fixing pin (22) and being located on the side of the second magnetic ring (26), and a first magnetic ring (24) being movably sleeved on the outer surfaces of the first fixing pin (20) and the second fixing pin (22), and being located on the side of the second magnetic ring (25).

4. A forklift hydraulic drive device according to claim 2, characterized in that: A telescopic rod (17) is fixedly mounted on the top of the bottom plate (16); a first rubber ring (18) is movably sleeved on the outer surface of the telescopic rod (17); and the first rubber ring (18) is in the shape of a circular ring with equal width at the top and bottom.

5. A forklift hydraulic drive device according to claim 3, characterized in that: A second rubber ring (25) is movably sleeved on the outer surfaces of the first fixing pin (20) and the second fixing pin (22), and the second rubber ring (25) is located between the first magnetic ring (24) and the second magnetic ring (26).

6. A forklift hydraulic drive device according to claim 2, characterized in that: A first rotating rod (11) is rotatably mounted between the two extension blocks on the top of the sliding plate (9), a second rotating rod (19) is rotatably mounted between the two third fixed blocks (14), and the connecting plate (10) is fixedly sleeved on the outer surfaces of the second rotating rod (19) and the first rotating rod (11).

7. A forklift hydraulic drive device according to claim 2, characterized in that: An oil pump frame (15) is fixedly mounted on the top of the telescopic rod (17), and the oil pump frame (15) is arc-shaped and just wraps around the oil pump (2).

8. The forklift hydraulic drive device according to claim 1, characterized in that: Rotating shafts (28) are fixedly mounted on both sides of the fixing frame (27), and the rotating shafts (28) are circular in shape with equal size at the top and bottom. Rubber wheels (29) are fixedly sleeved on the outsides of the rotating shafts (28).

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