Hydraulic cylinder with adjustable damping strength

Abstract

The utility model relates to the field of hydraulic cylinders, in particular to a hydraulic cylinder with adjustable damping strength. Comprising a cylinder body, a first cavity is formed in the cylinder body, a cylinder cover is installed at the top of the cylinder body, a hydraulic rod is arranged in the first cavity, the top of the hydraulic rod penetrates through the first cavity, a first sealing ring is arranged between the first cavity and the hydraulic rod, and a piston is arranged in the first cavity; the bottom of the hydraulic rod is installed at the center of the top of a piston, a second cavity is formed in the piston, an electric telescopic rod is installed at the center of the inner wall of the top of the piston, an ejector rod is installed at the output end of the electric telescopic rod, and the output end of the ejector rod penetrates through the piston and then is located under the piston. A second sealing ring is arranged between the piston and the ejector rod, and the bottom of the cylinder body is connected with a proportional valve. The hydraulic cylinder has the effect of adjusting the damping strength of the hydraulic cylinder.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic cylinders, and particularly relates to a hydraulic cylinder with adjustable shock absorption strength. Background Art

[0002] Hydraulic cylinder, also known as oil cylinder, is an important hydraulic equipment, widely used in many industrial fields. It is a device that converts liquid pressure energy into mechanical energy, usually used to push mechanical loads to perform linear reciprocating motion or swinging motion. In the hydraulic transmission system, the hydraulic cylinder, as an actuator, can directly withstand a certain pressure and load, thereby realizing the control and operation of mechanical equipment.

[0003] After searching, in the prior art, Chinese patent publication number: CN219242535U, authorization publication date: 2022-12-05, discloses a hydraulic cylinder shock absorber assembly, including a hydraulic cylinder, a piston rod inserted into the interior of the hydraulic cylinder, a piston valve fixedly connected to the lower end of the piston rod, a bottom valve fixedly connected to the lower interior of the hydraulic cylinder, an oil seal fixedly connected to the upper interior of the hydraulic cylinder, and the piston rod penetrates the oil seal. The above embodiment achieves the purpose of cleaning impurities inside the hydraulic oil by disassembling and cleaning the cleaning cylinder.

[0004] However, the device still has the following defects: the above embodiment does not have the function of adjusting the shock absorbing strength, while this embodiment can control the pressure, thereby controlling the shock absorbing strength of the hydraulic cylinder, and has the function of adjusting the shock absorbing strength of the hydraulic cylinder. Utility Model Content

[0005] In view of the above problems, the utility model provides a hydraulic cylinder with adjustable damping strength, comprising a cylinder body, a first cavity is formed in the cylinder body, a cylinder cover is installed on the top of the cylinder body, a hydraulic rod is arranged in the first cavity, the top of the hydraulic rod passes through the first cavity, and a first sealing ring is arranged between the first cavity and the hydraulic rod;

[0006] A piston is arranged in the first cavity, the bottom of the hydraulic rod is installed at the top center of the piston, the outer wall of the piston slides and fits on the inner wall of the cylinder body, a second cavity is opened in the piston, an electric lifting and retracting rod is installed at the center of the top inner wall of the piston, the electric lifting and retracting rod is located directly below the hydraulic rod, a push rod is installed on the output end of the electric lifting and retracting rod, the output end of the push rod passes through the piston and is located directly below the piston, a second sealing ring is arranged between the piston and the push rod, and a proportional valve is connected to the bottom of the cylinder body.

[0007] Furthermore, two groups of movable plates are symmetrically arranged below the first cavity. The movable plates are located at both ends of the hydraulic rod, and the movable plates are located in the first cavity.

[0008] Furthermore, two groups of first springs are symmetrically installed on the top of each group of the movable plates, and the top of each group of the first springs is installed on the bottom of the first cavity, and the first springs are located in the first cavity.

[0009] Furthermore, a buffer cavity is provided in the cylinder body, and the buffer cavity is located directly below the first cavity, and the top of the buffer cavity is connected to the bottom of the first cavity.

[0010] Furthermore, a plurality of groups of oil discharge channels are arranged in the cylinder body, the input end of each group of the oil discharge channels is communicated with the first cavity, and the output end of each group of the oil discharge channels is communicated with the buffer cavity.

[0011] Furthermore, an oil inlet channel is provided in the cylinder body, the input end of the oil inlet channel is communicated with the output end of the oil discharge channel, and the output end of the oil inlet channel is communicated with the buffer chamber.

[0012] Furthermore, a rectangular plate is provided in the buffer cavity, and an outer wall of the rectangular plate is slidably fitted on the inner wall of the cylinder body.

[0013] Furthermore, a second spring is installed at the bottom center of the rectangular plate, and one end of the second spring away from the rectangular plate is installed at the center of the bottom inner wall of the cylinder body.

[0014] The beneficial effects of the utility model are:

[0015] 1. The electric lifting and retracting rod drives the push rod to rise and fall, controls the distance between the bottom of the piston and the output end of the push rod, controls the pressure brought to the rectangular plate when the push rod contacts the rectangular plate, and converts the input electrical signal in proportion through the proportional valve to control the pressure, thereby controlling the shock absorption strength of the hydraulic cylinder, which has the function of adjusting the shock absorption strength of the hydraulic cylinder.

[0016] 2. The hydraulic rod drives the piston to move in the first cavity. The hydraulic rod drives the piston to rise and fall. The top of the piston fits with the bottom of the movable plate. The first spring is squeezed to have a buffering effect. The output end of the push rod contacts the top of the rectangular plate. The second spring is squeezed to have a buffering effect, thereby achieving a shock absorbing effect. When the hydraulic rod moves, it fits with the first sealing ring to ensure the air tightness between the hydraulic cylinder and the piston.

[0017] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures indicated in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 A schematic diagram of the structure of a hydraulic cylinder according to an embodiment of the utility model is shown;

[0020] Figure 2 A schematic cross-sectional view of a hydraulic cylinder according to an embodiment of the utility model is shown;

[0021] Figure 3 A schematic cross-sectional view of a cylinder head according to an embodiment of the utility model is shown;

[0022] Figure 4 A schematic cross-sectional view of a piston according to an embodiment of the utility model is shown.

[0023] In the figure: 1. cylinder body; 2. first cavity; 3. cylinder head; 4. hydraulic rod; 5. first sealing ring; 6. movable plate; 7. first spring; 8. piston; 9. second cavity; 10. electric lifting and retracting rod; 11. push rod; 12. second sealing ring; 13. buffer chamber; 14. oil discharge channel; 15. rectangular plate; 16. second spring; 17. proportional valve; 18. oil inlet channel. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The utility model embodiment provides a hydraulic cylinder with adjustable damping strength, for example, Figure 1 , Figure 2 and Figure 3As shown, it includes a cylinder body 1, a first cavity 2 is opened in the cylinder body 1, a cylinder head 3 is installed on the top of the cylinder body 1, a hydraulic rod 4 is arranged in the first cavity 2, the top of the hydraulic rod 4 passes through the first cavity 2, a first sealing ring 5 is arranged between the first cavity 2 and the hydraulic rod 4, two groups of movable plates 6 are symmetrically arranged below the first cavity 2, the movable plates 6 are located at both ends of the hydraulic rod 4, the movable plates 6 are located in the first cavity 2, two groups of first springs 7 are symmetrically installed on the top of each group of movable plates 6, the first springs 7 are located in the first cavity 2, the top of each group of the first springs 7 is installed on the bottom of the first cavity 2, a piston 8 is arranged in the first cavity 2, the bottom of the hydraulic rod 4 is installed at the top center of the piston 8, and the outer wall of the piston 8 slides and fits on the inner wall of the cylinder body 1.

[0026] For example, Figure 1 , Figure 2 and Figure 4 As shown, a second cavity 9 is provided in the piston 8, an electric lifting and retracting rod 10 is installed at the center of the top inner wall of the piston 8, and the electric lifting and retracting rod 10 is located directly below the hydraulic rod 4. A push rod 11 is installed on the output end of the electric lifting and retracting rod 10, and the output end of the push rod 11 passes through the piston 8 and is located directly below the piston 8. A second sealing ring 12 is provided between the piston 8 and the push rod 11, a buffer cavity 13 is provided in the cylinder body 1, and the buffer cavity 13 is located directly below the first cavity 2, and the top of the buffer cavity 13 is connected to the bottom of the first cavity 2, and a plurality of groups of oil discharge channels 14 are provided in the cylinder body 1, and each group of the oil discharge channels The input ends of the oil discharge channels 14 are all connected to the first cavity 2, and the output ends of each group of the oil discharge channels 14 are all connected to the buffer chamber 13. An oil inlet channel 18 is arranged in the cylinder body 1, and the input end of the oil inlet channel 18 is connected to the output end of the oil discharge channel 14, and the output end of the oil inlet channel 18 is connected to the buffer chamber 13. A rectangular plate 15 is arranged in the buffer chamber 13, and the outer wall of the rectangular plate 15 is slidably fitted on the inner wall of the cylinder body 1. A second spring 16 is installed at the bottom center of the rectangular plate 15, and one end of the second spring 16 away from the rectangular plate 15 is installed at the center of the bottom inner wall of the cylinder body 1. A proportional valve 17 is connected to the bottom of the cylinder body 1.

[0027] Working principle: The hydraulic cylinder is used on a seeder. The field is uneven. A seeder has four cylinders. The outrigger cylinders of the automatic wheel hub remain parallel. A proportional valve 17 is provided under the cylinder. It is electronically controlled. When the seeder moves on the uneven ground, the hydraulic cylinder works. The hydraulic rod 4 drives the piston 8 to move in the first cavity 2. The hydraulic rod 4 drives the piston 8 to rise. The top of the piston 8 fits with the bottom of the moving plate 6. The first spring 7 is squeezed to have a buffering effect. The hydraulic rod 4 drives the piston 8 to descend. The piston 8 drives the push rod 11 to descend. The output end of the push rod 11 contacts the top of the rectangular plate 15. The second spring 16 is squeezed to have a buffering effect, thereby achieving a shock absorbing effect. When the hydraulic rod 4 moves, it fits with the first sealing ring 5 to ensure the air tightness between the hydraulic cylinder and the piston.

[0028] The electric lifting and retracting rod 10 drives the push rod 11 to rise and fall, controls the distance between the bottom of the piston 8 and the output end of the push rod 11, controls the pressure exerted on the rectangular plate 15 when the push rod 11 contacts the rectangular plate 15, and converts the input electrical signal in proportion through the proportional valve 17 to control the pressure, thereby controlling the shock absorption strength of the hydraulic cylinder.

[0029] The electric lifting and retracting rod 10 drives the push rod 11 to rise and fall, controls the distance between the bottom of the piston 8 and the output end of the push rod 11, controls the pressure brought to the rectangular plate 15 when the push rod 11 contacts the rectangular plate 15, and converts the input electrical signal in proportion through the proportional valve 17 to control the pressure, thereby controlling the shock absorbing strength of the hydraulic cylinder, which has the function of adjusting the shock absorbing strength of the hydraulic cylinder.

[0030] The hydraulic rod 4 drives the piston 8 to move in the first cavity 2. The hydraulic rod 4 drives the piston 8 to rise and fall. The top of the piston 8 fits with the bottom of the movable plate 6. The first spring 7 is squeezed to have a buffering effect. The output end of the push rod 11 contacts the top of the rectangular plate 15. The second spring 16 is squeezed to have a buffering effect, thereby achieving a shock absorbing effect. When the hydraulic rod 4 moves, it fits with the first sealing ring 5 to ensure the air tightness between the hydraulic cylinder and the piston.

[0031] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic cylinder with adjustable damping strength, comprising a cylinder body (1), characterized in that: A first cavity (2) is provided in the cylinder body (1), a cylinder cover (3) is installed on the top of the cylinder body (1), a hydraulic rod (4) is provided in the first cavity (2), the top of the hydraulic rod (4) passes through the first cavity (2), and a first sealing ring (5) is provided between the first cavity (2) and the hydraulic rod (4); A piston (8) is arranged in the first cavity (2), the bottom of the hydraulic rod (4) is mounted at the top center of the piston (8), the outer wall of the piston (8) is slidably fitted on the inner wall of the cylinder body (1), a second cavity (9) is opened in the piston (8), an electric telescopic rod (10) is mounted at the top inner wall center of the piston (8), the electric telescopic rod (10) is located directly below the hydraulic rod (4), a push rod (11) is mounted on the output end of the electric telescopic rod (10), the output end of the push rod (11) passes through the piston (8) and is located directly below the piston (8), a second sealing ring (12) is arranged between the piston (8) and the push rod (11), and a proportional valve (17) is connected to the bottom of the cylinder body (1).

2. The hydraulic cylinder with adjustable damping strength according to claim 1, characterized in that: Two groups of movable plates (6) are symmetrically arranged below the first cavity (2); the movable plates (6) are located at both ends of the hydraulic rod (4); and the movable plates (6) are located in the first cavity (2).

3. The hydraulic cylinder with adjustable damping strength according to claim 2, characterized in that: Two groups of first springs (7) are symmetrically mounted on the top of each group of the moving plates (6); the top of each group of the first springs (7) is mounted on the bottom of the first cavity (2); and the first springs (7) are located in the first cavity (2).

4. The hydraulic cylinder with adjustable damping strength according to claim 1, characterized in that: A buffer chamber (13) is provided in the cylinder body (1), the buffer chamber (13) is located directly below the first cavity (2), and the top of the buffer chamber (13) is connected to the bottom of the first cavity (2).

5. The hydraulic cylinder with adjustable damping strength according to claim 4, characterized in that: A plurality of groups of oil discharge channels (14) are arranged in the cylinder body (1), the input end of each group of the oil discharge channels (14) is communicated with the first cavity (2), and the output end of each group of the oil discharge channels (14) is communicated with the buffer cavity (13).

6. The hydraulic cylinder with adjustable damping strength according to claim 5, characterized in that: An oil inlet channel (18) is provided in the cylinder body (1), the input end of the oil inlet channel (18) is connected to the output end of the oil discharge channel (14), and the output end of the oil inlet channel (18) is connected to the buffer chamber (13).

7. The hydraulic cylinder with adjustable damping strength according to claim 6, characterized in that: A rectangular plate (15) is arranged in the buffer chamber (13), and the outer wall of the rectangular plate (15) is slidably fitted on the inner wall of the cylinder body (1).

8. The hydraulic cylinder with adjustable damping strength according to claim 7, characterized in that: A second spring (16) is installed at the center of the bottom of the rectangular plate (15); one end of the second spring (16) away from the rectangular plate (15) is installed at the center of the bottom inner wall of the cylinder body (1).

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