Hydraulic buffer device of forklift side shifter

Abstract

The invention relates to the technical field of forklift side shifters, in particular to a hydraulic buffer device of a forklift side shifter, which comprises a lifting mechanism mounted at one end of a forklift body, a fixing frame is mounted on one side of the lifting mechanism, two groups of hydraulic cylinders are mounted in the fixing frame, and the two groups of hydraulic cylinders are in opposite directions. In the initial state, air can be blown to the upper surfaces of the two sets of inserting rods, water stains and mud stains on the upper surfaces of the inserting rods are air-dried, and therefore the water stains can be air-dried in time, and the metal surface humidity degree can be reduced; according to the side shifter, the oxidation corrosion risk is reduced, the service life of the inserting rod and related parts is prolonged, meanwhile, the surface of the inserting rod is kept dry and clean, it can be guaranteed that the supporting force of the inserting rod on goods is uniform and stable, the goods sliding or dumping risk caused by uneven stress is reduced, the stress of the side shifter is more uniform, and therefore the service life of the side shifter is prolonged.

Description

Technical Field

[0001] The present invention relates to the technical field of forklift side shifters, and particularly to a hydraulic buffer device for a forklift side shifter. Background Art

[0002] Forklifts need to frequently adjust the position of goods in logistics and warehousing scenarios. As a key component, the side shifter needs to achieve fast and accurate lateral movement.

[0003] During the use of traditional side shifters, there is a lack of a certain buffer force. As a result, when the hydraulic system stops after movement, the goods will generate an instantaneous impact force towards the moving direction side due to the instantaneous stop, which will cause the goods to shake or even slide, affecting the operation efficiency and safety, and will also increase the working load on the hydraulic system synchronously. Summary of the Invention

[0004] In the initial state, the present invention blows air on the upper surfaces of two groups of insertion rods to dry the water stains and mud stains on the upper surfaces of the insertion rods. Timely drying of the water stains can reduce the humidity of the metal surface, reduce the risk of oxidation and rust, extend the service life of the insertion rods and related components. At the same time, keeping the surfaces of the insertion rods dry and clean can ensure that the supporting force of the insertion rods on the goods is uniform and stable, reduce the risk of the goods slipping or tipping over due to uneven force, and make the force on the side shifter more uniform, thereby extending the service life of the side shifter.

[0005] To achieve the above object, the present invention provides the following technical solution: A hydraulic buffer device for a forklift side shifter, including a lifting mechanism installed at one end of the vehicle body. A fixed frame is installed on one side of the lifting mechanism. Two hydraulic cylinders are installed inside the fixed frame. The two hydraulic cylinders are in opposite directions. One end of each of the two hydraulic cylinders is connected to an insertion rod. An air inlet pipe is arranged on one side of the hydraulic cylinder. One end of the air inlet pipe is communicated with an airbag.

[0006] A connecting pipe A is connected to the outside of the air inlet pipe. One end of the connecting pipe A penetrates through the insertion rod and extends to the outside. A guiding pipe A is communicated with the outside of the connecting pipe A. One end of the guiding pipe A is connected to a supporting plate. A fixing buckle is installed outside the guiding pipe A. The other end of the fixing buckle is connected to the lifting mechanism.

[0007] Fixing frames are installed on both sides of the fixed frame. A connecting pipe B is rotated at one end of the airbag. A gear is connected to the outside of the connecting pipe B. Two guiding pipes C are connected to one end of the connecting pipe B. One end of each of the two guiding pipes C is connected to a shock-absorbing plate.

[0008] Preferably, push rods are movably connected inside the two hydraulic cylinders. One end of each of the two push rods is respectively connected to the two insertion rods.

[0009] Preferably, there are two intake pipes arranged on one side of the two hydraulic cylinders. One end of the intake pipe is connected to the airbag, and the other end of the intake pipe 7 is connected to the fan. A spring rod is connected to the outside of the intake pipe. The spring rod penetrates through the intake pipe and extends to the inside to be connected to valve A. One end of the spring rod away from the intake pipe is connected to a disc. The disc is located on one side of the push rod and is in contact with the push rod.

[0010] Preferably, two connecting pipes A are connected to the outside of the two intake pipes. The other ends of the two connecting pipes A penetrate through the insertion rods, and the output ports of the other ends of the connecting pipes A are on the same plane as the upper surface of the insertion rods.

[0011] Preferably, a branch pipe A is connected to the outside of the connecting pipe A. One end of the branch pipe A is connected to the guide pipe A. A push rod A is movably connected inside the guide pipe A. One end of the push rod A located inside the guide pipe A is connected to a spring A. The other end of the spring A is connected to the inner wall of the guide pipe A. One end of the push rod A located outside the guide pipe A is connected to a support plate. The support plate is located at the lower ends of the two insertion rods. A pressure relief hole A is arranged on the outside of the guide pipe A.

[0012] Preferably, two fixing frames are installed on both sides of the fixing frame. Two airbags are installed at the upper ends of the two fixing frames. One end of the gear close to the connecting pipe B is connected to a rotating shaft. One end of the rotating shaft penetrates through the connecting pipe B and extends to the inside to be connected to valve B.

[0013] Preferably, a guide pipe B is arranged on one side of the connecting pipe B. A push rod B is movably connected inside the guide pipe B. The outer diameter of the push rod B does not completely match the inner diameter of the guide pipe B. One end of the push rod B located outside the guide pipe B is connected to a rack. The rack is engaged with the gear. One end of the guide pipe B is connected to a branch pipe B. The other end of the branch pipe B is connected to the inside of the intake pipe.

[0014] Preferably, two guide pipes C are installed inside the fixing frame. One end of each of the two guide pipes C is movably connected to a push rod C. One end of the push rod C located inside the guide pipe C is connected to a spring B. The other end of the spring B is connected to the inner wall of the guide pipe C. One end of the push rod C located outside the guide pipe C is connected to a shock-absorbing plate. A pressure relief hole B is installed on the outside of the guide pipe C.

[0015] Preferably, there are two shock-absorbing plates. Two spring C are fixedly connected between the two shock-absorbing plates.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. In the initial state, the present invention blows air on the upper surfaces of two groups of insertion rods to dry the water stains and mud stains on the upper surfaces of the insertion rods. Timely drying of the water stains can reduce the humidity of the metal surface, reduce the risk of oxidation and rust, extend the service life of the insertion rods and related components, ensure the long-term reliable operation of the equipment. At the same time, keeping the surfaces of the insertion rods dry and clean can ensure that the supporting force of the insertion rods on the goods is uniform and stable, reduce the risk of the goods slipping or tipping due to uneven force, and make the force on the side shifter more uniform, thereby extending the service life of the side shifter.

[0018] 2. When the ejector rod A is squeezed into the inside of the guide tube A, the constant air pressure inside the guide tube A can prevent the ejector rod A from descending rapidly instantaneously, avoiding the violent impact of the goods due to sudden descent, reducing the impact on the forklift lifting mechanism and the side shifter structure, reducing the risk of equipment wear and failure. At the same time, cooperating with the spring A inside the guide tube A, the combined action of the air pressure forms a double buffer, effectively suppressing the violent shaking or tilting of the goods caused by sudden stop, preventing the goods from slipping or tipping, and ensuring the stability and safety of the goods during transportation.

[0019] 3. When the insertion rod stops side shifting, the shock-absorbing plate exerts a reverse impact force on the insertion rod, thereby offsetting the lateral force generated when the insertion rod stops instantaneously. And the shock-absorbing plate simultaneously buffers the goods, further preventing the instantaneous lateral force generated when the side shifting stops from causing the goods to tilt at the upper end of the insertion rod. Thus, at the moment when the insertion rod stops side shifting, the reverse impact force exerted by the shock-absorbing plate can effectively offset its instantaneous lateral force, reduce the impact generated by the sudden stop of the insertion rod, and reduce the risk of damage to the equipment structure. At the same time, the shock-absorbing plate buffers the goods simultaneously, reducing the influence of the instantaneous lateral force when the side shifting stops, preventing the goods from tilting due to unbalanced force at the upper end of the insertion rod, and ensuring the stability and safety of the goods during transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The first overall structure diagram of the present invention;

[0021] Figure 2 The second overall structure diagram of the present invention;

[0022] Figure 3 The first partial structure diagram of the present invention;

[0023] Figure 4 The second partial structure diagram of the present invention;

[0024] Figure 5 The third partial structure diagram of the present invention;

[0025] Figure 6 The first partial structure sectional view of the present invention;

[0026] Figure 7The second partial structural sectional view of the present invention;

[0027] Figure 8 For the present invention Figure 3 Enlarged view of the structure at position A in;

[0028] Figure 9 For the present invention Figure 6 Enlarged view of the structure at position B in;

[0029] Figure 10 For the present invention Figure 6 Enlarged view of the structure at position C in the present invention

[0030] Figure 11 For the present invention Figure 7 Enlarged view of the structure at position D in the present invention.

[0031] In the figure: 1, vehicle body; 2, lifting mechanism; 3, fixed frame; 4, hydraulic cylinder; 5, push rod; 6, inserting rod; 7, air inlet pipe; 8, spring rod; 9, disc; 10, connecting pipe A; 11, branch pipe A; 12, guiding pipe A; 13, ejector rod A; 14, spring A; 15, supporting plate; 16, fixing buckle; 17, fixing bracket; 18, airbag; 19, connecting pipe B; 20, gear; 21, rotating shaft; 22, rack; 23, ejector rod B; 24, guiding pipe B; 25, branch pipe B; 26, guiding pipe C; 27, ejector rod C; 28, spring B; 29, shock absorption plate; 30, spring C. Detailed implementation manners

[0032] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0033] According to Figures 1-11 As shown, the present invention provides a hydraulic buffer device for a forklift side shifter, including a lifting mechanism 2 installed at one end of a vehicle body 1, a fixed frame 3 installed on one side of the lifting mechanism 2, two groups of hydraulic cylinders 4 installed inside the fixed frame 3, the two groups of hydraulic cylinders 4 being in opposite directions, inserting rods 6 being connected to one end of each of the two groups of hydraulic cylinders 4, an air inlet pipe 7 being arranged on one side of the hydraulic cylinder 4, and an airbag 18 being communicated with one end of the air inlet pipe 7;

[0034] A connecting pipe A10 is connected to the outside of the air inlet pipe 7. One end of the connecting pipe A10 penetrates through the insertion rod 6 and extends to the outside. A guiding pipe A12 is communicated with the outside of the connecting pipe A10. One end of the guiding pipe A12 is connected to a support plate 15. A fixing buckle 16 is installed outside the guiding pipe A12. The other end of the fixing buckle 16 is connected to the lifting mechanism 2;

[0035] Fixing frames 17 are installed on both sides of the fixing frame 3. A connecting pipe B19 is rotatably connected to one end of the airbag 18. A gear 20 is connected to the outside of the connecting pipe B19. One end of the connecting pipe B19 is connected to two groups of guiding pipes C26. One end of the two groups of guiding pipes C26 is connected to a shock-absorbing plate 29.

[0036] In an alternative embodiment, push rods 5 are movably connected inside two groups of hydraulic cylinders 4. One end of each of the two groups of push rods 5 is respectively connected to two groups of insertion rods 6. When the device needs to be laterally moved during use, the two groups of hydraulic cylinders 4 cooperate with each other to control the two groups of insertion rods 6 to move to different positions. Furthermore, during use, the distance between the two groups of insertion rods 6 can be controlled according to the actual situation or the movement of the goods can be controlled, thereby improving the convenience during use.

[0037] In an alternative embodiment, two groups of air inlet pipes 7 are provided on one side of the two groups of hydraulic cylinders 4. One end of the air inlet pipe 7 is connected to the airbag 18, and the other end of the air inlet pipe 7 is connected to a blower. A spring rod 8 is connected to the outside of the air inlet pipe 7. The spring rod 8 penetrates through the air inlet pipe 7 and extends to the inside to be connected to a valve A. The end of the spring rod 8 away from the air inlet pipe 7 is connected to a disc 9. The disc 9 is located on one side of the push rod 5 and is in contact with the push rod 5. When the device is in use, the blower will be started synchronously, and the valve A inside the air inlet pipe 7 is in a closed state in the initial state. When the insertion rod 6 is laterally moved by using the hydraulic cylinder 4, the hydraulic cylinder 4 will push out the push rod 5. When the push rod 5 moves, it will come into contact with the disc 9 and thus generate friction. When the push rod 5 comes into contact with the disc 9 and generates friction, the disc 9 will rotate. When the disc 9 rotates, it will synchronously drive the spring rod 8 to rotate. When the spring rod 8 rotates, it will synchronously open the valve A inside the air inlet pipe 7, so that air flow enters the inside of the airbag 18 through the air inlet pipe 7. When the push rod 5 stops, the disc 9 will automatically reset due to the disappearance of the frictional force through the force of the spring rod 8. Thus, when the disc 9 and the spring rod 8 are reset, the valve A will be reset synchronously.

[0038] In an alternative embodiment, connecting pipes A10 are connected to the outside of both groups of intake pipes 7. The other ends of the two groups of connecting pipes A10 penetrate through the insertion rods 6, and the output ports at the other ends of the connecting pipes A10 are in the same plane as the upper surfaces of the insertion rods 6. From the above, since the valve A inside the intake pipe 7 is in a closed state initially, the fan will form air pressure inside the intake pipe 7 when the wind blows. And because the valve A is in a closed state, the air pressure inside the intake pipe 7 will enter the inside of the connecting pipe A10 in the initial state. After the air pressure enters the inside of the connecting pipe A10, the air pressure will be discharged through the connecting pipe A10. After the air pressure is discharged through the connecting pipe A10, it will blow the upper surfaces of the two insertion rods 6, thereby drying the water stains and mud stains on the upper surfaces of the insertion rods 6. Timely drying of the water stains can reduce the humidity of the metal surface, reduce the risk of oxidation and corrosion, extend the service life of the insertion rods 6 and related components, ensure the long-term reliable operation of the equipment, and at the same time keeping the surface of the insertion rods 6 dry and clean can ensure that the supporting force of the insertion rods 6 on the goods is uniform and stable, reduce the risk of the goods slipping or tipping over caused by uneven force, and make the force on the side shifter more uniform, thereby extending the service life of the side shifter.

[0039] In an alternative embodiment, a branch pipe A11 is connected to the outside of the connecting pipe A10. One end of the branch pipe A11 is connected to the guide pipe A12. A push rod A13 is movably connected inside the guide pipe A12. One end of the push rod A13 located inside the guide pipe A12 is connected to a spring A14. The other end of the spring A14 is connected to the inner wall of the guide pipe A12. One end of the push rod A13 located outside the guide pipe A12 is connected to the support plate 15. The support plate 15 is located below the lower ends of the two inserting rods 6. A pressure relief hole A is provided on the outside of the guide pipe A12. From the above, after the air pressure enters the inside of the connecting pipe A10, part of the air pressure will enter the inside of the branch pipe A11. After the air pressure enters the inside of the branch pipe A11, the branch pipe A11 will deliver the air pressure to the inside of the guide pipe A12. After the air pressure enters the inside of the guide pipe A12, the air pressure will be discharged through the pressure relief hole A on the outside of the guide pipe A12. The pressure relief amount of the pressure relief hole A matches the air intake amount of the branch pipe A11. Thus, after the air pressure enters the inside of the guide pipe A12, the air pressure inside the guide pipe A12 will always be maintained in a constant state. And in the initial state, the push rod A13 will be pushed outwards by the force of the spring A14, so that the support plate 15 contacts the lower ends of the two inserting rods 6. When the support plate 15 contacts the lower ends of the inserting rods 6 and the fixed frame 3 is lifted upwards by the lifting mechanism 2, the two guide pipes A12 and the inserting rods 6 will be driven to rise synchronously. When the lifting mechanism 2 stops rising, the goods will generate an instantaneous downward pressure due to their own weight. At this time, because the support plate 15 is at the lower ends of the two inserting rods 6, the pressure will be synchronously transmitted to the support plate 15. When pressure is exerted on the support plate 15, the support plate 15 will squeeze the push rod A13 to contract towards the inside of the guide pipe A12. Since the air pressure inside the guide pipe A12 is in a constant state, when the push rod A13 is squeezed into the inside of the guide pipe A12, the push rod A13 will not drop at an instantaneous speed. And with the spring A14 inside the guide pipe A12, it will buffer the instantaneous pressure generated by the goods. Thus, the constant air pressure inside the guide pipe A12 can prevent the push rod A13 from dropping rapidly instantaneously, avoiding violent impacts caused by the rapid descent of the goods, reducing the impact on the forklift lifting mechanism 2 and the side shifter structure, and reducing the risk of equipment wear and failure. At the same time, with the cooperation of the spring A14 inside the guide pipe A12, a dual buffer is formed together with the air pressure, effectively suppressing the violent shaking or tilting of the goods caused by sudden stops, preventing the goods from slipping or tipping over, and ensuring the stability and safety of the goods during transportation.

[0040] In an alternative embodiment, two sets of fixed brackets 17 are installed on both sides of the fixed frame 3. Two air bags 18 are installed at the upper ends of the two sets of fixed brackets 17. One end of the gear 20 close to the connecting pipe B19 is connected to a rotating shaft 21. One end of the rotating shaft 21 penetrates through the connecting pipe B19 and extends to the inside to be connected to the valve B. When the side-shifting inserting rod 6 is shifted, as the air pressure enters the inside of the air bag 18 through the air inlet pipe 7, the air bag 18 will gradually expand. The valve B inside the connecting pipe B19 is in an open state in the initial state.

[0041] In an alternative embodiment, a guide tube B24 is provided on one side of the connecting tube B19. A push rod B23 is movably connected inside the guide tube B24. The outer diameter of the push rod B23 does not completely match the inner diameter of the guide tube B24. One end of the push rod B23 located outside the guide tube B24 is connected to a rack 22, and the rack 22 meshes with a gear 20. One end of the guide tube B24 is connected to a branch tube B25, and the other end of the branch tube B25 is connected to the inside of the intake pipe 7. While the intake pipe 7 is inflating the inside of the airbag 18, part of the air pressure will enter the inside of the guide tube B24 through the branch tube B25. After the air pressure enters the inside of the guide tube B24, the guide tube B24 will push the push rod B23 outwards. After the push rod B23 is pushed outwards, it will synchronously push the rack 22 to move, so that the rack 22 drives the gear 20 to rotate. When the gear 20 rotates, it will drive the rotating shaft 21 to rotate, thereby closing the valve B, and then storing the air pressure entering the inside of the airbag 18. And because only when the hydraulic cylinder 4 laterally moves the insertion rod 6 will the intake pipe 7 inflate the inside of the airbag 18, the inflation volume of the airbag 18 matches the lateral movement distance of the insertion rod 6. When the intake pipe 7 stops inflating the airbag 18, due to the mismatch between the outer diameter of the push rod B23 and the inner diameter of the guide tube B24, the remaining air pressure will flow out through the gap between the push rod B23 and the guide tube B24. As the air pressure flows out, the push rod B23 will automatically reset due to the gravity of the rack 22. During the reset time of the rack 22, it will synchronously drive the gear 20 to rotate, thereby opening the valve B. After the valve B is opened, the air pressure inside the airbag 18 will be instantaneously squeezed by the tension of the airbag 18 itself and enter the inside of the two guide tubes C26 through the connecting tube B19.

[0042] In an alternative embodiment, two sets of guide pipes C26 are installed inside the fixing frame 17. One end of each of the two sets of guide pipes C26 is movably connected to a push rod C27. One end of the push rod C27 located inside the guide pipe C26 is connected to a spring B28, and the other end of the spring B28 is connected to the inner wall of the guide pipe C26. One end of the push rod C27 located outside the guide pipe C26 is connected to the shock-absorbing plate 29. A pressure relief hole B is installed outside the guide pipe C26. From the above, after the air pressure enters the two sets of guide pipes C26, the guide pipes C26 will quickly push the two push rods C27 outwards. After the two push rods C27 are pushed outwards, they will simultaneously push the shock-absorbing plate 29 into contact with the insertion rod 6 and the goods above the insertion rod 6. Thus, when the insertion rod 6 stops moving laterally, the shock-absorbing plate 29 will exert a reverse impact force on the insertion rod 6, thereby offsetting the inertial impact force of the instantaneous stop of the insertion rod 6, and the shock-absorbing plate 29 will simultaneously buffer the goods, further preventing the instantaneous lateral force generated when the lateral movement stops from causing the goods to tilt on the upper end of the insertion rod 6. Thus, at the moment when the insertion rod 6 stops moving laterally, the reverse impact force exerted by the shock-absorbing plate 29 can effectively offset its instantaneous lateral force, reduce the impact generated by the sudden stop of the insertion rod 6, and reduce the risk of damage to the equipment structure. At the same time, the shock-absorbing plate 29 buffers the goods simultaneously, reducing the influence of the instantaneous lateral force when the lateral movement stops, and preventing the goods from tilting due to unbalanced forces on the upper end of the insertion rod 6, ensuring the stability and safety of the goods during transportation;

[0043] When the hydraulic cylinder 4 pushes the push rod 5, it will simultaneously open the valves A inside the two intake pipes 7. Thus, when the insertion rod 6 moves laterally, the two shock-absorbing plates 29 on both sides will be pushed out simultaneously. Thus, when the insertion rod 6 stops, one of the shock-absorbing plates 29 in the moving direction of the insertion rod 6 will come into contact with the insertion rod 6, and the other shock-absorbing plate 29 will pop out in an empty push manner.

[0044] In an alternative embodiment, two shock-absorbing plates 29 are provided. Two springs C30 are fixedly connected between the two shock-absorbing plates 29. When the shock-absorbing plates 29 come into contact with the insertion rod 6 and the goods, the springs C30 between the two shock-absorbing plates 29 will first generate a certain buffering force, thereby preventing the shock-absorbing plates 29 from directly contacting the goods and the insertion rod 6 and causing an increase in the load of the hydraulic cylinder 4 or causing the goods to tilt due to a large impact force.

[0045] Working principle: When using the device, the fan will be started synchronously, and the valve A inside the air inlet pipe 7 is in a closed state initially. When the hydraulic cylinder 4 is used to laterally move the insertion rod 6, the hydraulic cylinder 4 will push out the push rod 5. When the push rod 5 moves, it will contact the disc 9 and thus generate friction. When the push rod 5 contacts the disc 9 and generates friction, the disc 9 will rotate. When the disc 9 rotates, it will synchronously drive the spring rod 8 to rotate. When the spring rod 8 rotates, it will synchronously open the valve A inside the air inlet pipe 7, so that the air flow enters the air bag 18 through the air inlet pipe 7. When the push rod 5 stops, the disc 9 will automatically reset due to the disappearance of the frictional force by the force of the spring rod 8. Thus, when the disc 9 and the spring rod 8 are reset, the valve A will be reset synchronously;

[0046] Since the valve A inside the air inlet pipe 7 is in a closed state initially, thus in the initial state, the fan will form air pressure inside the air inlet pipe 7. And because the valve A is in a closed state, thus in the initial state, the air pressure inside the air inlet pipe 7 will enter the connecting pipe A10. After the air pressure enters the connecting pipe A10, the air pressure will be discharged through the connecting pipe A10. After the air pressure is discharged through the connecting pipe A10, it will blow the upper surfaces of the two insertion rods 6, so as to air-dry the water stains and mud stains on the upper surfaces of the insertion rods 6

[0047] After the air pressure enters the connecting pipe A10, part of the air pressure will enter the branch pipe A11. After the air pressure enters the branch pipe A11, the branch pipe A11 will convey the air pressure into the guide pipe A12. After the air pressure enters the guide pipe A12, the air pressure will be discharged through the pressure relief hole A on the outer side of the guide pipe A12. The pressure relief amount of the pressure relief hole A matches the air intake amount of the branch pipe A11. Thus, after the air pressure enters the guide pipe A12, the air pressure inside the guide pipe A12 will always be maintained in a constant state. And in the initial state, the ejector rod A13 will be pushed outwards by the force of the spring A14, so that the support plate 15 contacts the lower ends of the two insertion rods 6. When the support plate 15 contacts the lower ends of the insertion rods 6 and the fixed frame 3 is lifted synchronously by the lifting mechanism 2, the two guide pipes A12 and the insertion rods 6 will be driven to rise. When the lifting mechanism 2 stops rising, the goods will generate an instantaneous downward pressure due to their own weight. At this time, because the support plate 15 is at the lower ends of the two insertion rods 6, the pressure will be synchronously transmitted to the support plate 15. When pressure is exerted on the support plate 15, the support plate 15 will squeeze the ejector rod A13 to contract into the guide pipe A12. Since the air pressure amount inside the guide pipe A12 is in a constant state, thus when the ejector rod A13 is squeezed into the guide pipe A12, the ejector rod A13 will not drop at an instantaneous speed. And in cooperation with the spring A14 inside the guide pipe A12, it will buffer the instantaneous pressure generated by the goods;

[0048] When the side-shifting plug rod 6 is shifted, as the valve A is opened, air pressure will enter the interior of the airbag 18 through the air inlet pipe 7, so that the airbag 18 will gradually expand. While the air inlet pipe 7 is inflating the interior of the airbag 18, part of the air pressure will enter the interior of the guide pipe B24 through the branch pipe B25. After the air pressure enters the interior of the guide pipe B24, the guide pipe B24 will push the ejector rod B23 outwards. After the ejector rod B23 is pushed outwards, it will synchronously push the rack 22 to move, so that the rack 22 drives the gear 20 to rotate. When the gear 20 rotates, it will drive the rotating shaft 21 to rotate, thereby closing the valve B, and then storing the air pressure entering the interior of the airbag 18. When the air inlet pipe 7 stops inflating the airbag 18, due to the mismatch between the outer diameter of the ejector rod B23 and the inner diameter of the guide pipe B24, the remaining air pressure will flow out through the gap between the ejector rod B23 and the guide pipe B24. As the air pressure flows out, the ejector rod B23 will automatically reset due to the gravity of the rack 22. During the reset time of the rack 22, it will synchronously drive the gear 20 to rotate, thereby opening the valve B. After the valve B is opened, the air pressure inside the airbag 18 will be instantaneously squeezed by the tension of the airbag 18 itself and enter the interiors of the two groups of guide pipes C26 through the connecting pipe B19.

[0049] After the air pressure enters the interiors of the two groups of guide pipes C26, the guide pipes C26 will quickly push the two groups of ejector rods C27 outwards. After the two groups of ejector rods C27 are pushed outwards, they will synchronously push the shock-absorbing plate 29 to contact the plug rod 6 and the goods above the plug rod 6. Thus, when the plug rod 6 stops side-shifting, the shock-absorbing plate 29 will apply a reverse impact force to the plug rod 6, thereby offsetting the inertial impact force of the instant stop of the plug rod 6, and the shock-absorbing plate 29 will synchronously buffer the goods. When the hydraulic cylinder 4 pushes the push rod 5, it will synchronously open the valves A inside the two groups of air inlet pipes 7. Thus, when the plug rod 6 is side-shifted, the two groups of shock-absorbing plates 29 on both sides will be synchronously pushed out. Thus, when the plug rod 6 stops, one group of shock-absorbing plates 29 in the moving direction of the plug rod 6 will contact the plug rod 6, and the other group of shock-absorbing plates 29 will pop out in an empty-pushing manner.

[0050] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A hydraulic buffer device for a forklift side shifter, comprising a lifting mechanism (2) installed at one end of a vehicle body (1), characterized in that, On one side of the lifting mechanism (2), a fixed frame (3) is installed. Inside the fixed frame (3), two hydraulic cylinders (4) are installed. The two hydraulic cylinders (4) are in opposite directions. One end of each of the two hydraulic cylinders (4) is connected to a plug rod (6). On one side of the hydraulic cylinder (4), an air inlet pipe (7) is provided. One end of the air inlet pipe (7) is communicated with an air bag (18). On the outside of the air inlet pipe (7), a connecting pipe A (10) is connected. One end of the connecting pipe A (10) penetrates through the plug rod (6) and extends to the outside. On the outside of the connecting pipe A (10), a guiding pipe A (12) is communicated. One end of the guiding pipe A (12) is connected to a supporting plate (15). A fixing buckle (16) is installed outside the guiding pipe A (12). The other end of the fixing buckle (16) is connected to the lifting mechanism (2). On both sides of the fixed frame (3), fixed brackets (17) are installed. One end of the air bag (18) is rotatably connected with a connecting pipe B (19). On the outside of the connecting pipe B (19), a gear (20) is connected. One end of the connecting pipe B (19) is connected to two guiding pipes C (26). One end of each of the two guiding pipes C (26) is connected to a shock-absorbing plate (29).

2. The hydraulic buffer device of a forklift side shifter according to claim 1, characterized in that, Inside the two hydraulic cylinders (4), push rods (5) are movably connected. One end of each of the two push rods (5) is respectively connected to two plug rods (6).

3. The hydraulic buffer device of a forklift side shifter according to claim 1, characterized in that, On one side of the two hydraulic cylinders (4), two air inlet pipes (7) are provided. One end of the air inlet pipe (7) is connected to the air bag (18), and the other end of the air inlet pipe (7) is connected to a blower. On the outside of the air inlet pipe (7), a spring rod (8) is connected. The spring rod (8) penetrates through the air inlet pipe (7) and extends to the inside to be connected to a valve A. The end of the spring rod (8) far from the air inlet pipe (7) is connected to a disc (9). The disc (9) is located on one side of the push rod (5) and is in contact with the push rod (5).

4. The hydraulic buffer device of a forklift side shifter according to claim 1, characterized in that, On the outside of the two air inlet pipes (7), connecting pipes A (10) are respectively connected. The other ends of the two connecting pipes A (10) both penetrate through the plug rod (6). The output ports of the other ends of the connecting pipes A (10) are on the same plane as the upper surface of the plug rod (6).

5. The hydraulic buffer device of a forklift side shifter according to claim 1, characterized in that, On the outside of the connecting pipe A (10), a branch pipe A (11) is connected. One end of the branch pipe A (11) is connected to the guiding pipe A (12). Inside the guiding pipe A (12), a top rod A (13) is movably connected. One end of the top rod A (13) located inside the guiding pipe A (12) is connected to a spring A (14). The other end of the spring A (14) is connected to the inner wall of the guiding pipe A (12). The end of the top rod A (13) located outside the guiding pipe A (12) is connected to the supporting plate (15). The supporting plate (15) is located below the two plug rods (6). A pressure relief hole A is provided on the outside of the guiding pipe A (12).

6. The hydraulic buffer device of a forklift side shifter according to claim 5, characterized in that, On both sides of the fixed frame (3), two fixed brackets (17) are installed. On the upper ends of the two fixed brackets (17), air bags (18) are installed. One end of the gear (20) close to the connecting pipe B (19) is connected to a rotating shaft (21). One end of the rotating shaft (21) penetrates through the connecting pipe B (19) and extends to the inside to be connected to a valve B.

7. The hydraulic buffer device of a forklift side shifter according to claim 1, characterized in that, On one side of the connecting pipe B (19), a guide pipe B (24) is provided. Inside the guide pipe B (24), a push rod B (23) is movably connected. The outer diameter of the push rod B (23) does not exactly match the inner diameter of the guide pipe B (24). One end of the push rod B (23) located outside the guide pipe B (24) is connected to a rack (22). The rack (22) meshes with a gear (20). One end of the guide pipe B (24) is connected to a branch pipe B (25). The other end of the branch pipe B (25) is connected to the inside of the intake pipe (7).

8. The hydraulic buffer device of a forklift side shifter according to claim 1, characterized in that Two guide pipes C (26) are installed inside the fixing frame (17). One end of each of the two guide pipes C (26) is movably connected to a push rod C (27). One end of the push rod C (27) located inside the guide pipe C (26) is connected to a spring B (28). The other end of the spring B (28) is connected to the inner wall of the guide pipe C (26). One end of the push rod C (27) located outside the guide pipe C (26) is connected to a shock-absorbing plate (29). A pressure relief hole B is installed outside the guide pipe C (26).

9. The hydraulic buffer device of a forklift side shifter according to claim 1, characterized in that, Two shock-absorbing plates (29) are provided. Two spring C (30) are fixedly connected between the two shock-absorbing plates (29).

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