Rust-proof forklift oil cylinder

Abstract

The utility model relates to the field of oil cylinders, in particular to an anti-rust forklift oil cylinder which comprises a cylinder barrel, a piston tightly connected to the inner wall of the cylinder barrel in a sliding mode and a piston rod connected to the piston, and the end of the piston rod extends out of the cylinder barrel. The piston or the piston rod is provided with a one-way valve enabling a medium to flow from the rod cavity to the oil inlet and outlet, so that hydraulic oil and air in the rod cavity can be discharged from the oil inlet and outlet through the one-way valve, external water vapor is not prone to entering the cylinder barrel, and the possibility that the inner wall of the cylinder barrel is rusted is reduced.

Description

Technical Field

[0001] The present application relates to the field of oil cylinders, and in particular to a rust-proof forklift oil cylinder. Background Art

[0002] A cylinder for lifting will be set on the forklift mast. In order to simplify the structure and facilitate maintenance, a single-acting piston cylinder is generally selected, which only needs to be connected with one oil pipe.

[0003] The space on the side of the cylinder barrel of a single-acting piston oil cylinder that is located toward the piston rod is the rod chamber, and the space on the other side is the rodless chamber. Hydraulic oil enters the rodless chamber to push the piston rod out. During the hydraulic oil injection process, on the one hand, the air in the rod chamber needs to be removed, and on the other hand, the hydraulic oil that leaks from the rodless chamber into the rod chamber needs to be removed. It is necessary to open an oil return port on the side of the cylinder barrel that is located at the rod chamber. The oil return port is connected to the oil tank so that the air in the rod chamber and a small amount of leaked hydraulic oil can be discharged into the oil tank. For example, a single-acting piston multi-stage synchronous oil cylinder for a disabled boarding vehicle is disclosed with the publication number CN108457930A.

[0004] In the above-mentioned related technologies, since the oil tank is directly connected to the atmosphere, when the piston rod is retracted, air containing water vapor can easily enter the rod cavity, causing the inner wall of the cylinder to be easily corroded. Utility Model Content

[0005] In order to reduce the possibility of rust on the inner wall of the cylinder barrel of a single-acting piston cylinder, the present application provides a rust-proof forklift cylinder.

[0006] The present application provides a rust-proof forklift oil cylinder adopts the following technical solution.

[0007] A rust-proof forklift oil cylinder comprises a cylinder barrel, a piston tightly slidably connected to the inner wall of the cylinder barrel, and a piston rod connected to the piston and with the end thereof extending out of the cylinder barrel. An oil inlet and an oil outlet for injecting hydraulic oil into the cylinder barrel are provided at one end of the cylinder barrel away from the rod chamber, and the piston or the piston rod is provided with a one-way valve that allows the medium to flow from the rod chamber to the oil inlet and the oil outlet.

[0008] By adopting the above technical solution, when hydraulic oil is fed into the cylinder, the air in the rod chamber is squeezed. When the air in the rod chamber reaches a certain pressure, the air or a small part of the leaked hydraulic oil will enter the oil inlet and outlet from the one-way valve, so that it is difficult for water vapor from the external atmosphere to enter the inner wall of the cylinder, making the inner wall of the cylinder difficult to rust.

[0009] Optionally, the one-way valve is arranged at the center of the piston, and the piston is formed with a protrusion plugged into the piston rod, the protrusion connects the rod cavity and the one-way valve, and the protrusion and the piston are formed with an airway.

[0010] By adopting the above technical solution, the piston rod is not easily deflected in the radial direction, and the gas and hydraulic oil in the rod cavity can flow smoothly to the one-way valve through the air passage.

[0011] Optionally, a cylinder block plugged into the piston is formed in the cylinder, and the oil inlet and outlet ports penetrate through the oil inlet and outlet ports.

[0012] By adopting the above technical solution, the inner wall of the opening where the piston and cylinder block are inserted will also be subjected to radial pressure from the hydraulic oil, so that the position where the sealing ring is set on the outer wall of the piston can be more closely attached to the inner wall of the cylinder, so as to further reduce the possibility of oil leakage between the piston and the cylinder.

[0013] Optionally, the oil inlet and outlet ports are located so that the opening axis of the barrel block is consistent with the axis of the cylinder barrel.

[0014] By adopting the above technical solution, the initial pressure from the hydraulic oil on the piston is relatively balanced.

[0015] Optionally, a baffle for the flow of hydraulic oil is placed in the inner wall of the piston for insertion into the cylinder block, the baffle is abutted against a valve sleeve at the side away from the one-way valve, the valve sleeve is tightly mounted on the cylinder block, and the piston is detachably connected to a steel wire baffle ring abutting against one end of the valve sleeve away from the baffle.

[0016] By adopting the above technical solution, the valve sleeve can be tightly mounted on the cylinder block during the initial movement or the final movement of the piston during the resetting process, so as to further ensure the stability of the piston movement. In addition, during the initial movement of the piston, the valve sleeve can also push the piston to move by pumping in a small amount of hydraulic oil, thereby accelerating the reaction speed of the cylinder.

[0017] Optionally, there is a distance between the end surface of the cylinder block where the oil inlet and outlet are opened and the piston.

[0018] By adopting the above technical solution, during the initial movement of the piston, the force-bearing area of ​​the piston is larger, and the initial movement of the piston is easier.

[0019] Optionally, the piston is formed with a limiting inclined surface, and one end of the one-way valve close to the stopper abuts against the limiting inclined surface to prevent the one-way valve from moving away from the stopper.

[0020] By adopting the above technical solution, when the one-way valve is subjected to the pressure from the hydraulic oil, the main pressure is the axial pressure and radial pressure of the one-way valve close to the inlet and outlet oil ports, so that the one-way valve as a whole is not easily subjected to a large axial extrusion force, reducing the possibility of damage to the one-way valve.

[0021] Optionally, the stopper abuts against the periphery of the one-way valve, the stopper abuts against the surface of the one-way valve and the inner wall of the piston at the same time.

[0022] By adopting the above technical solution, the one-way valve is not easy to move arbitrarily in the piston, and the one-way valve is not easy to bear excessive axial pressure.

[0023] In summary, the present application includes at least the following beneficial effects:

[0024] When hydraulic oil is sent into the cylinder, the air in the rod chamber is squeezed. When the air pressure in the rod chamber reaches a certain level, the air or a small amount of leaked hydraulic oil will enter the oil inlet and outlet from the one-way valve, making it difficult for water vapor from the outside atmosphere to enter the inner wall of the cylinder, making it difficult for the inner wall of the cylinder to rust. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic cross-sectional view of the present application;

[0026] Figure 2 yes Figure 1 Enlarged view of point A in the middle.

[0027] Explanation of the reference numerals in the accompanying drawings: 1. Cylinder barrel; 2. Piston; 21. Air passage; 22. Valve hole; 3. Piston rod; 31. Rod chamber; 32. Oil inlet and outlet; 33. One-way valve; 34. Bump; 35. Cylinder block; 36. Stopper; 37. Valve sleeve; 38. Wire retaining ring; 39. Limiting ramp. DETAILED DESCRIPTION

[0028] The present application is further described in detail below in conjunction with the accompanying drawings.

[0029] The present application embodiment discloses a rust-proof forklift oil cylinder, referring to Figure 1 , including a cylinder 1, in which a piston 2 is tightly and slidably connected along its own axial direction, and the piston 2 is tightly and detachably connected to a piston rod 3, and the piston rod 3 extends out of the cylinder 1 at one end away from the piston 2. An oil inlet and outlet 32 ​​for hydraulic oil to pass through is formed at the end of the cylinder 1 away from the piston rod 3, and the center line of the oil inlet and outlet 32 ​​at one end of the inner wall of the cylinder 1 is the same as the axis of the cylinder 1.

[0030] Reference Figure 1 The inner wall of the cylinder 1 where the oil inlet and outlet 32 ​​are provided is coaxially formed with a barrel block 35, and the oil inlet and outlet 32 ​​penetrates the barrel block 35. The barrel block 35 is plugged into the piston 2. The bottom surface of the opening of the piston 2 for the barrel block 35 to be plugged into is abutted with a stopper 36. There is a gap between the stopper 36 and the barrel block 35. The stopper 36 penetrates a formed hole at the center of the surface of the barrel block 35 for the hydraulic oil to flow. The end surface of the stopper 36 close to the barrel block 35 is abutted with a valve sleeve 37, which is tightly sleeved on the outer wall of the circumference of the barrel block 35. The side of the valve sleeve 37 away from the stopper 36 is abutted with a wire retaining ring 38 to fix the position of the valve sleeve 37.

[0031] Reference Figure 1The piston 2 is formed with a protrusion 34 on the surface facing the piston rod 3. The protrusion 34 is tightly inserted into the piston rod 3. A valve hole 22 for the hydraulic oil to pass through is opened between the piston 2 and the protrusion 34. A one-way valve 33 is placed at one end of the valve hole 22 close to the stopper 36. The periphery of the end surface of the one-way valve 33 facing the stopper 36 just abuts against the stopper 36. The one-way valve 33 only allows the air and hydraulic oil in the rod chamber 31 to flow to the inlet and outlet oil ports 32. In addition, an air channel 21 is formed on the circumferential outer wall of the protrusion 34 and the end surface of the piston 2 facing the piston rod 3. Several air channels 21 can be evenly arranged around the axis of the piston rod 3, so that the gas and hydraulic oil in the rod chamber 31 can flow smoothly to the one-way valve 33 through the air channel 21.

[0032] Reference Figure 1 and Figure 2 A limiting slope 39 is formed on the inner wall of one end of the valve hole 22 close to the stopper 36. The closer the limiting slope 39 is to the stopper 36, the larger the inner diameter is. The diameter of the one-way valve 33 is largest at the end close to the stopper 36. The largest diameter of the one-way valve 33 abuts against the largest inner diameter of the limiting slope 39, and the end face of the one-way valve 33 away from the stopper 36 does not abut against other objects, so that the axial pressure from the hydraulic oil borne by the one-way valve 33 is decomposed into pressures in two directions, axial and radial, so that the one-way valve 33 as a whole is not easily subjected to large axial pressure, thereby improving the service life of the one-way valve 33.

[0033] The implementation principle of a rust-proof forklift cylinder in an embodiment of the present application is as follows: the hydraulic oil enters between the cylinder block 35 and the stopper 36 through the oil inlet and outlet 32, so that the piston 2 is pushed. When the piston 2 moves a certain distance and the air pressure in the rod chamber 31 is relatively high, the air or hydraulic oil will be discharged from the rod chamber 31 through the one-way valve 33.

[0034] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A rust-proof forklift oil cylinder, comprising a cylinder barrel (1), a piston (2) tightly slidably connected to the inner wall of the cylinder barrel (1), a piston rod (3) connected to the piston (2) and with an end extending out of the cylinder barrel (1), an oil inlet and outlet (32) for injecting hydraulic oil into the cylinder barrel (1) is provided at one end of the cylinder barrel (1) away from the rod chamber (31), and characterized in that: The piston (2) or the piston rod (3) is provided with a one-way valve (33) that enables the medium to flow from the rod chamber (31) to the oil inlet and outlet ports (32).

2. The rust-proof forklift cylinder according to claim 1, characterized in that: The one-way valve (33) is arranged at the center of the piston (2). The piston (2) is formed with a protrusion (34) inserted into the piston rod (3). The protrusion (34) connects the rod cavity (31) and the one-way valve (33). The protrusion (34) and the piston (2) are formed with an air passage (21).

3. The rust-proof forklift cylinder according to claim 1, characterized in that: A cylinder block (35) is formed in the cylinder barrel (1) and is plugged into the piston (2), and the oil inlet and outlet ports (32) penetrate through the oil inlet and outlet ports (32).

4. The rust-proof forklift oil cylinder according to claim 3, characterized in that: The oil inlet and outlet ports (32) are located at an opening axis of the cylinder block (35) that is consistent with the axis of the cylinder barrel (1).

5. The rust-proof forklift oil cylinder according to claim 4, characterized in that: A stopper (36) for hydraulic oil circulation is placed in the inner wall of the piston (2) for inserting into the cylinder block (35); a valve sleeve (37) is abutted against the stopper (36) at one side away from the one-way valve (33); the valve sleeve (37) is tightly sleeved on the cylinder block (35); and a steel wire retaining ring (38) is detachably connected to the piston (2) and abutted against one end of the valve sleeve (37) away from the stopper (36).

6. The rust-proof forklift oil cylinder according to claim 5, characterized in that: There is a distance between the end surface of the cylinder block (35) on which the oil inlet and outlet ports (32) are opened and the piston (2).

7. The rust-proof forklift oil cylinder according to claim 5, characterized in that: The piston (2) is formed with a limiting inclined surface (39), and one end of the one-way valve (33) close to the stopper (36) abuts against the limiting inclined surface (39) to prevent the one-way valve (33) from moving away from the stopper (36).

8. The rust-proof forklift oil cylinder according to claim 7, characterized in that: The stopper (36) abuts against the periphery of the one-way valve (33); the stopper (36) abuts against the surface of the one-way valve (33) and the inner wall of the piston (2).

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