New type of pressure resistant hydraulic cylinder

Abstract

This utility model discloses a novel pressure-resistant hydraulic cylinder. It features an oil supply port located only in the rodless chamber; an even array of spring support seats and positioning seats on the cylinder body; a pull rod between the spring support seats and positioning seats; and a return spring on the pull rod. A linkage rod is located at the outer end of the piston rod, and several pull rods are fixed to the linkage rod. This structural design allows for rapid extension and retraction of the piston rod under single-end oil supply. Simultaneously, the linkage rod, pull rod, and return spring work together to provide force support for the piston rod, preventing deformation under pressure, and enabling rapid reset. A guide component is also provided on the piston rod, and a guide block is mounted on the cylinder body in conjunction with the guide component. A displacement counting device is fixed on the cylinder body, and the guide component is linked to the displacement counting device. When the guide component moves with the piston rod, the displacement counting device synchronously displays the displacement scale while ensuring display accuracy.

Description

Technical Field

[0001] This utility model relates to the field of pressure-resistant hydraulic cylinder technology, and in particular to a novel pressure-resistant hydraulic cylinder. Background Technology

[0002] As is well known, existing hydraulic cylinders are designed by setting oil supply ports in both the rod chamber and the rodless chamber, and achieving the extension and retraction of the cylinder rod through the circulation of oil from both ends, thereby obtaining its function of applying external force.

[0003] Existing hydraulic cylinders of this type have functional and technical drawbacks, which can be summarized as follows: 1. The existing oil supply system requires two sets of reversing valves for frequent reversing, and the oil circuits at both ends counterbalance each other during oil supply, resulting in a relatively slow rod response; 2. The rod extension and retraction cannot be quantified, making it unsuitable for applications with special requirements for extension amount, and requiring a separate measuring device; 3. When force is applied, the rod is prone to deformation under the reaction force, and severe friction with the cylinder wall during retraction can easily cause damage.

[0004] As those skilled in the art, there is a current need to design a new type of pressure-resistant hydraulic cylinder with a relatively simple structure, stable operation, stable pressure, and rapid response. The purpose is to achieve stable pressure output while ensuring safety and efficiency. Summary of the Invention

[0005] In order to solve the above-mentioned technical problems, the present invention focuses on developing a new type of pressure-resistant hydraulic cylinder. The purpose is to achieve rapid movement of the cylinder rod through single-end oil supply, and to ensure stable operation, effectively displaying the elongation and allowing it to be read by the outside world.

[0006] The technical solution adopted is as follows: A novel pressure-resistant hydraulic cylinder includes a cylinder body, the cylinder body having an internal cavity, a piston and a piston rod disposed within the cavity, the right side of the piston being a rodless cavity and the left side of the piston being a rod cavity; an oil supply port is disposed within the rodless cavity; The cylinder body is provided with an even number of spring support seats and positioning seats, and a pull rod is provided between the spring support seats and positioning seats. A return spring is provided on the pull rod; a linkage rod is provided on the outer end of the piston rod, and several pull rods are fixed on the linkage rod. The piston rod is also provided with a guide member, and a guide block is provided on the cylinder body in cooperation with the guide member; a displacement counting device is fixed on the cylinder body, and the guide member is linked with the displacement counting device. When the guide member moves with the piston rod, the displacement counting device displays the displacement scale synchronously.

[0007] The cavity is provided with an end plug and a cylinder head at its end. The cavity is provided with internal threads for fixing the end plug, and the cylinder is provided with external threads for fixing the cylinder head. Radial sealing rings are provided between the end plug and the cylinder wall and the piston rod. The end plug is stepped and an axial sealing ring is provided on the stepped surface. An auxiliary sealing ring is provided between the end plug and the cylinder head and the piston rod.

[0008] Several sealing rings are provided between the outer diameter of the piston and the cylinder wall to achieve multi-stage sealing.

[0009] The oil supply port is a stepped hole, with its diameter gradually decreasing towards the rodless cavity.

[0010] The piston rod has a carburized layer on its outer wall, and the thickness of the carburized layer is not less than 0.2 mm.

[0011] The beneficial effects of this utility model are as follows: This utility model provides an oil supply port only within the rodless cavity; it provides an even array of spring support seats and positioning seats on the cylinder body, with a pull rod between the spring support seats and positioning seats, and a return spring on the pull rod; a linkage rod is provided on the outer end of the piston rod, and several pull rods are fixed to the linkage rod; through the above structural configuration, rapid extension and retraction of the piston rod can be achieved under the premise of single-end oil supply. Simultaneously, through the cooperation of the linkage rod, pull rod, and return spring, the piston rod can be supported by force, preventing deformation under pressure, and rapid reset can also be achieved; a guide component is also provided on the piston rod, and a guide block is provided on the cylinder body in conjunction with the guide component; a displacement counting device is fixed on the cylinder body, and the guide component is linked with the displacement counting device. When the guide component moves with the piston rod, the displacement counting device synchronously displays the displacement scale and ensures display accuracy.

[0012] In addition to the main advantages mentioned above, this utility model also has the following advantages: the piston rod is specially treated to be wear-resistant, reducing friction and greatly improving the service life of the cylinder; the precise guide structure design prevents jamming and scoring; the variable diameter design of the oil supply port improves the inlet pressure, prevents leakage, and extends the service life of the cylinder; by controlling the pressure of the rodless chamber, the pressure boosting effect of the rod chamber can be improved, with a maximum pressure of up to 250MPa; the multiple sealing structure makes the piston movement more airtight. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a side view structural diagram of the present invention; Figure 3 This is a schematic diagram of the internal structure of the main view of this utility model; Figure 4 yes Figure 3Enlarged schematic diagram of the structure of region A in the middle; Reference numerals: 1. Cylinder block; 11. Oil supply port; 12. Narrow diameter end; 13. Base; 2. Piston; 21. Sealing ring I; 22. Sealing ring II; 23. Piston rod; 24. Carburized layer; 3. End plug; 31. Radial sealing ring I; 32. Radial sealing ring II; 33. Axial sealing ring; 34. Auxiliary sealing ring; 4. End cover; 5. Return spring; 50. Linkage rod; 51. Pull rod; 52. Spring support seat; 54. Positioning seat; 6. Guide plate; 61. Guide block; 7. Displacement counting device; 71. Pulling part; 8. Cavity; 81. Rod chamber; 82. Rodless chamber. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0015] As shown in the attached figure, a novel pressure-resistant hydraulic cylinder includes a cylinder body 1. The cylinder body 1 contains a cavity 8, within which a piston 2 and a piston rod 23 are disposed. The right side of the piston 2 is a rodless cavity 82, and the left side is a rod cavity 81. An oil supply port 11 is provided within the rodless cavity 82. The oil supply port 11 employs a variable diameter design. In this embodiment, the oil supply port 11 is a stepped hole, with its diameter gradually tapering towards the rodless cavity 82 to form a narrow end 12. This design allows for improved inlet pressure through the narrow end 12 when external oil is supplied. The oil supply port 11 has an internal thread that engages with the external oil supply device, preventing leakage and extending the cylinder's service life.

[0016] The cylinder body 1 is provided with an even set of spring support seats 52 and positioning seats 53. In this embodiment, two sets of spring support seats 52 and positioning seats 53 are provided. A pull rod 51 is provided between each set of spring support seats 52 and positioning seats 53. A return spring 5 is provided around the pull rod 51. A linkage rod 50 is provided on the outer end of the piston rod 23, and several pull rods 51 are simultaneously fixed on the linkage rod 50. With the above structural configuration, when oil is supplied to the new type of pressure-resistant cylinder, no hydraulic oil is introduced into its rod chamber 81. Its internal pressure increases with the increase of the pressure in the rodless chamber 82. The user can control the pressure in the rod chamber 81 by supplying oil to only one end, and the maximum pressure can reach 250MPa.

[0017] With single-end oil supply, the piston rod 23 can be quickly extended and retracted. At the same time, through the linkage rod 50, the pull rod 51, and the return spring 5, the piston rod 23 can be supported by force to prevent deformation when subjected to pressure, and it can also be quickly reset.

[0018] Furthermore, this invention also includes a guide plate 6 on the piston rod 23 as a guide component. A guide block 61 is provided on the cylinder body 1 in conjunction with the guide plate 6. This precise guiding design prevents the piston rod 23 from jamming or being damaged. A displacement counting device 7 is fixed on the cylinder body 1. The guide plate 6 is linked to the displacement counting device 7. Specifically, the guide plate 6 is designed as a bent structure, with one end connected and fixed to the piston rod 23, and the other end fixed to the pulling part 71 of the displacement counting device 7. The displacement counting device 7 can be digital, directly displaying the displacement value. Alternatively, the displacement counting device 7 can be non-digital, displaying the extension / retraction value of the piston rod 23 through graduations on the pulling part 71 as the guide plate 6 moves with the piston rod 23. The guide plate 6 not only cooperates with the displacement counting device 7 but also guides the lateral extension / retraction of the piston rod 23.

[0019] Furthermore, the cavity 8 is provided with an end plug 3 and a cylinder head 4 at its end. The cavity 8 has internal threads for fixing the end plug 3, and the cylinder 1 has external threads for fixing the cylinder head 4. The cylinder head 4 and end plug 3 are configured to improve the sealing performance of the cavity 8, thereby improving the working stability of the piston rod 23 and the piston 2. This invention also provides two sealing rings, sealing ring I 21 and sealing ring II 22, between the outer diameter of the piston 2 and the cylinder wall, achieving multi-layer sealing during axial movement of the piston 2. Furthermore, this invention also provides radial sealing ring I 31 and radial sealing ring II 32 between the end plug 3, the piston rod 23, and the cylinder wall. Because the end plug 3 is stationary, but the piston rod 23 moves axially, this structure ensures the sealing stability of the right side of the end plug 3 after assembly.

[0020] In this embodiment, the end plug 3 is stepped, and an axial sealing ring 33 is provided on the stepped surface to achieve axial sealing on the basis of radial sealing. An auxiliary sealing ring 34 is also provided between the end plug 3 and the cylinder head 4 and the piston rod, and the sealing between the end plug 3 and the cylinder head 4 and the piston rod 23 is achieved by the auxiliary sealing ring 34.

[0021] This invention also improves the piston rod 23 by providing a carburized layer 24 on the outer wall of the piston rod 23. The thickness of the carburized layer is not less than 0.2 mm, which can increase the hardness of the outer skin of the piston rod 23, resulting in better surface smoothness and wear resistance. It can also reduce the surface friction when the piston rod 23 moves laterally, and greatly improve the service life of the hydraulic cylinder.

Claims

1. A novel pressure-resistant hydraulic cylinder, characterized in that: The system includes a cylinder body, which has an internal cavity containing a piston and a piston rod. The piston has a rodless cavity on its right side and a rod cavity on its left side. An oil supply port is located in the rodless cavity. The cylinder body is equipped with an even set of spring support seats and positioning seats. A pull rod is positioned between the spring support seats and the positioning seats, and a return spring is mounted on the pull rod. A linkage rod is mounted on the outer end of the piston rod, and several pull rods are fixed to the linkage rod. The piston rod is also provided with a guide member, and a guide block is provided on the cylinder body in cooperation with the guide member; a displacement counting device is fixed on the cylinder body, and the guide member is linked with the displacement counting device. When the guide member moves with the piston rod, the displacement counting device displays the displacement scale synchronously.

2. The novel pressure-resistant hydraulic cylinder according to claim 1, characterized in that: The cavity is provided with an end plug and a cylinder head at its end. The cavity is provided with internal threads for fixing the end plug, and the cylinder is provided with external threads for fixing the cylinder head. Radial sealing rings are provided between the end plug and the cylinder wall and the piston rod. The end plug is stepped and an axial sealing ring is provided on the stepped surface. An auxiliary sealing ring is provided between the end plug and the cylinder head and the piston rod.

3. The novel pressure-resistant hydraulic cylinder according to claim 1, characterized in that: Several sealing rings are provided between the outer diameter of the piston and the cylinder wall.

4. The novel pressure-resistant hydraulic cylinder according to claim 1, characterized in that: The oil supply port is a stepped hole, with its diameter gradually decreasing towards the rodless cavity.

5. The novel pressure-resistant hydraulic cylinder according to claim 1, characterized in that: The piston rod has a carburized layer on its outer wall, and the thickness of the carburized layer is not less than 0.2 mm.

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