High-horsepower tractor integrated hydraulic cylinder with buffer

Abstract

This utility model discloses a buffer-type integrated hydraulic cylinder for high-horsepower tractors, comprising a cylinder body, a cylinder bottom and a rod head respectively disposed at both ends of the cylinder body, a piston movably mounted inside the cylinder body, and a piston rod fixedly mounted to the piston to push the rod head. An oil passage mounting block is integrally mounted on one side of the top of the cylinder body, and the oil passage mounting block has an A oil passage port and a B oil passage port respectively. Both the A and B oil passage ports have buffer mechanisms installed at their extensions into the cylinder body. A rod head end cap is fixedly mounted at one end inside the cylinder body, and a buffer ring is fixedly mounted inside the rod head end cap. During the oil return process, the oil pressure squeezes the oil ring, forcing the returning hydraulic oil to return only from inside the extension, thereby reducing the pressure generated by the oil return and achieving a certain buffering effect on the piston, increasing the buffering capacity of the cylinder.

Description

Technical Field

[0001] This utility model belongs to the field of integrated hydraulic cylinder technology, specifically relating to a buffer-type integrated hydraulic cylinder for high-horsepower tractors. Background Technology

[0002] An integrated hydraulic cylinder, also known as a "hydraulic locking cylinder" or "built-in valve group cylinder," is not a single component, but a highly integrated functional module that combines the hydraulic cylinder body, control valve group (such as directional valves, balance valves, locking valves, etc.), and even sensors (such as displacement sensors and pressure sensors). By bringing together disparate components, it improves system performance and reliability.

[0003] A domestic utility model patent application with application number CN202320579847.4 discloses a buffer cylinder, including a cylinder body, a first piston, and a second piston. The cylinder body has an oil chamber, a first oil port, a second oil port, and a first oil passage. A buffer oil chamber is located at the bottom of the oil chamber. The second piston includes a piston head and piston rods and a buffer plunger head located on either side of the piston head. The buffer plunger head engages with the buffer oil chamber for buffering. The first oil passage connects to the bottom of the oil chamber and the first oil port, respectively, and a first flow valve is provided on the first oil passage. The buffer plunger head of the second piston and the buffer oil chamber can engage for buffering at the end of the stroke when the piston retracts. The buffer inner convex ring of the oil chamber engages with the buffer outer convex ring of the first piston, and the buffer inner convex ring of the first piston engages with the buffer outer convex ring of the second piston for buffering at the end of the stroke when the piston advances. Through the buffering engagement on both sides of the cylinder, the cylinder decelerates at the end of the stroke, reducing the impact. When used in casting molds, this results in a longer service life for both the mold equipment and the cylinder. The above-mentioned utility model reduces the impact by using the buffering combination on both sides of the cylinder and controlling the flow valve. Relying solely on the buffer ring is usually insufficient to achieve the ideal and reliable buffering effect of heavy-duty cylinders for high-horsepower tractors. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a buffer-type integrated hydraulic cylinder for high-horsepower tractors, including a cylinder body, a cylinder bottom and a rod head respectively disposed at both ends of the cylinder body, a piston movably installed inside the cylinder body, and a piston rod fixedly installed with the piston to push the rod head. An oil passage mounting block is integrally installed on one side of the top of the cylinder body, and the oil passage mounting block is respectively provided with an A oil passage port and a B oil passage port. Both the A oil passage port and the B oil passage port are equipped with a buffer mechanism at the port extending into the cylinder body. A rod head end cap is fixedly installed at one end inside the cylinder body, and a buffer ring is fixedly installed inside the rod head end cap.

[0005] As a further preferred technical solution of this utility model; a valve core is fixedly installed in the oil circuit mounting block at the positions of oil inlet A and oil inlet B, and a valve sleeve is installed at one end of the valve core. A drum-shaped ring is fixedly installed on the outside of one end of the valve core, and a dumbbell ring is installed on the outer ring of the valve sleeve. An oil seal is installed between the valve sleeve and the valve core. One end of the valve sleeve extends out of the oil circuit mounting block and is positioned and installed by the front end cover. A dustproof ring is provided at the end of the front end cover, and a rubber protective cap is installed at the end of the front end cover.

[0006] The valve core and valve sleeve form a "hydraulic switch" during the process of transporting hydraulic oil in the oil circuit. Through relative motion, they can precisely control the direction, pressure, and flow rate of the hydraulic oil flowing into or out of the cylinder, thereby ultimately controlling the cylinder's direction of movement, output force, and speed.

[0007] As a further preferred technical solution of this utility model, a sealing box is fixedly installed on the inner wall of the cylinder at the location of the buffer mechanism, the B oil port extends into the cylinder and is provided with an oil passage, and the A oil port is connected to the other end of the cylinder through an extended oil pipe.

[0008] The two sets of oil circuits are located in different positions, which causes them to deliver hydraulic oil into the cylinder, resulting in different oil pressures at both ends of the piston, thus causing the piston rod to reciprocate.

[0009] As a further preferred technical solution of this utility model, the buffer mechanism includes a positioning ring frame arranged around the outside of the oil passage, a rubber block fixedly installed at the bottom of the positioning ring frame, and oil injection rings connected to the bottom of the rubber block at both ends. Four sets of connecting springs are installed between the bottom of the positioning ring frame and the inner wall of the sealing box, and the top of the oil injection ring is provided with an extension placed inside the oil passage.

[0010] During the hydraulic oil delivery process, the oil pressure pushes the extension and the oil injection ring downwards, thereby squeezing the connecting spring with the positioning ring frame. The hydraulic oil flows out from the gap between the bottom of the oil passage and the top of the oil injection ring, as well as from the extension and the inside of the oil injection ring. During the oil return process, the oil pressure squeezes the oil injection ring, so that the hydraulic oil can only return from the inside of the extension, thereby reducing the pressure generated by the oil return and achieving a certain buffering effect on the piston, increasing the buffering capacity of the cylinder.

[0011] As a further preferred technical solution of this utility model; a combined oil seal is fixedly installed around the outside of the piston, a sealing ring is fixedly installed around the outside of the rod end cap, and multiple sets of sealing rubber rings and a set of wear-resistant rings are fixedly installed on the inner ring of the rod end cap on both sides of the buffer ring.

[0012] By combining different sealing structures such as oil seals and sealing rings, and depending on their installation position and function, they together form a sealing system inside the cylinder to prevent leakage of pressurized oil, ensure effective pressure build-up, and thus guarantee the working efficiency, performance, and service life of the cylinder.

[0013] As a further preferred technical solution of this utility model, the cylinder bottom and the inner ring of the rod head are both equipped with bearing sleeves for docking, and the top of the cylinder bottom is provided with an oil injection cup.

[0014] The cylinder bottom and rod head are connected and fixed to external machines or structures respectively, allowing the cylinder to swing within a certain angle to adapt to the slight deflection of the cylinder body itself and avoid bending stress caused by installation errors or frame deformation. Beneficial effects

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] During the hydraulic oil delivery process, the oil pressure pushes the extension and the oil injection ring downwards, thereby squeezing the connecting spring with the positioning ring frame. The hydraulic oil flows out from the gap between the bottom of the oil passage and the top of the oil injection ring, as well as from the extension and the inside of the oil injection ring. During the oil return process, the oil pressure squeezes the oil injection ring, so that the hydraulic oil can only return from the inside of the extension, thereby reducing the pressure generated by the oil return and achieving a certain buffering effect on the piston, increasing the buffering capacity of the cylinder. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0019] Figure 3 This is a schematic diagram of the internal structure at the location of the oil circuit mounting block of this utility model;

[0020] Figure 4 for Figure 3 Schematic diagram of the structure at point A;

[0021] Figure 5 for Figure 3 A schematic diagram of the structure at point B.

[0022] In the diagram: 1. Cylinder block; 2. Cylinder bottom; 21. Oil cup; 3. Rod head; 31. Bearing sleeve; 4. Oil circuit mounting block; 41. Oil circuit port A; 42. Oil circuit port B; 421. Oil circuit passage; 43. Front end cap; 44. Extension oil circuit pipe; 45. Valve core; 451. Drum ring; 46. Valve sleeve; 461. Dumbbell ring; 462. Oil seal; 47. Rubber protective cap; 48. Dustproof ring; 5. Piston; 51. Combined oil seal; 52. Piston rod; 53. Rod head end cap; 54. Sealing ring; 55. Buffer ring; 56. Wear-resistant ring; 6. Sealing box; 7. Buffer mechanism; 71. Positioning ring frame; 72. Rubber block; 73. Oil cup; 74. Extension; 75. Connecting spring. Detailed Implementation

[0023] This specific implementation is a buffer-type integrated hydraulic cylinder for high-horsepower tractors.

[0024] The above-mentioned utility model reduces the impact by using the buffering combination on both sides of the cylinder and controlling the flow valve. Relying solely on the buffer ring is usually insufficient to achieve the ideal and reliable buffering effect of heavy-duty cylinders for high-horsepower tractors.

[0025] Example 1: Its structural schematic diagram is as follows Figures 1-5 As shown. A high-horsepower tractor-grade integrated hydraulic cylinder with buffer includes a cylinder body 1, a cylinder bottom 2 and a rod head 3 located at both ends of the cylinder body 1. Bearing sleeves 31 are installed on the inner rings of both the cylinder bottom 2 and the rod head 3 for mating, and an oil cup 21 is provided on the top of the cylinder bottom 2. The cylinder bottom 2 and the rod head 3 are connected and fixed to external machines or structures at both ends, allowing the cylinder to swing within a certain angle to accommodate the slight deflection of the cylinder body 1 and avoid bending stress caused by installation errors or frame deformation. It also includes a piston 5 movably installed inside the cylinder body 1 and a piston rod 52 fixedly installed with the piston 5 to push the rod head 3. An oil passage mounting block 4 is integrally installed on one side of the top of the cylinder body 1, and the oil passage mounting block 4 has an A oil passage port 41 and a B oil passage port 42 respectively. Valve cores 45 are fixedly installed inside the oil circuit mounting blocks 4 at positions A oil inlet 41 and B oil inlet 42. A valve sleeve 46 is connected to one end of the valve core 45, and a drum-shaped ring 451 is fixedly installed on the outside of one end of the valve core 45. A dumbbell-shaped ring 461 is installed on the outer ring of the valve sleeve 46. An oil seal 462 is installed between the valve sleeve 46 and the valve core 45. One end of the valve sleeve 46 extends out of the oil circuit mounting block 4 and is positioned by a front end cover 43. A dustproof ring 48 and a rubber protective cap 47 are installed at the end of the front end cover 43. The valve core 45 and valve sleeve 46 form a "hydraulic switch" during the delivery of hydraulic oil in the oil circuit. Through relative movement, they precisely control the direction, pressure, and flow rate of the hydraulic oil flowing into or out of the cylinder, thereby ultimately controlling the cylinder's direction of movement, output force, and speed. Buffer mechanisms 7 are installed at the ports of A oil inlet 41 and B oil inlet 42 extending into the cylinder body 1.

[0026] A sealing box 6 is fixedly installed on the inner wall of the cylinder 1 at the location of the buffer mechanism 7. The B oil port 42 extends into the cylinder 1 and is provided with an oil passage 421. The A oil port 41 is connected to the other end of the cylinder 1 through an extension oil pipe 44. The different positions of the two sets of oil passages cause different oil pressures at both ends of the piston 5 as they supply hydraulic oil to the inside of the cylinder 1, thereby causing the piston rod 52 to reciprocate. The buffer mechanism 7 includes a positioning ring frame 71 arranged around the outside of the oil passage 421, a rubber block 72 fixedly installed at the bottom of the positioning ring frame 71, and oil injection rings 73 connected to the bottom of the rubber block 72 at both ends. Four sets of connecting springs 75 are installed between the bottom of the positioning ring frame 71 and the inner wall of the sealing box 6. The top of the oil injection ring 73 is provided with an extension 74 placed inside the oil passage 421. During the hydraulic oil delivery process, the oil pressure pushes the extension 74 and the oil injection ring 73 downwards, thereby squeezing the connecting spring 75 by the positioning ring frame 71. Hydraulic oil flows out from the gap between the bottom of the oil passage 421 and the top of the oil injection ring 73, as well as from the extension 74 and the inside of the oil injection ring 73. During the oil return process, the oil pressure squeezes the oil injection ring 73, so that the hydraulic oil can only return from the inside of the extension 74, thereby reducing the pressure generated by the oil return and achieving a certain buffering effect on the piston 5, increasing the buffering capacity of the cylinder. A rod end cap 53 is fixedly installed at one end inside the cylinder body 1, and a buffer ring 55 is fixedly installed inside the rod end cap 53. A combined oil seal 51 is fixedly installed around the outside of the piston 5, and a sealing ring 54 is fixedly installed around the outside of the rod end cap 53. Multiple sets of sealing rubber rings and a set of wear-resistant rings 56 are fixedly installed on both sides of the inner ring of the rod end cap 53. By combining different sealing structures such as oil seal 51 and sealing ring 54, and according to their different installation positions and functions, they together form a sealing system inside the cylinder body 1 to prevent leakage of pressurized oil, ensure effective pressure establishment, and thus guarantee the working efficiency, performance and service life of the cylinder.

[0027] The cylinder bottom 2 and rod head 3 are connected and fixed to external machines or structures respectively. During the process of conveying hydraulic oil, the oil pressure pushes the extension 74 and the oil injection ring 73 down, thereby squeezing the connecting spring 75 by the positioning ring frame 71. The hydraulic oil flows out from the gap between the bottom of the oil passage 421 and the top of the oil injection ring 73, as well as from the extension 74 and the inside of the oil injection ring 73. During the oil return process, the oil pressure squeezes the oil injection ring 73, so that the hydraulic oil can only return from the inside of the extension 74, thereby reducing the pressure generated by the oil return and achieving a certain buffering effect on the piston 5, increasing the buffering capacity of the cylinder.

[0028] All technical features in this embodiment can be freely combined according to actual needs.

[0029] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A buffering type integrated hydraulic cylinder for a high-horsepower tractor, comprising a cylinder body (1), a cylinder bottom (2) and a rod head (3) respectively arranged at both ends of the cylinder body (1), a piston (5) movably mounted in the cylinder body (1), and a piston rod (52) fixedly mounted with the piston (5) and used to push the rod head (3), characterized in that, The cylinder body (1) is integrally mounted with an oil circuit mounting block (4) on one side of the top, and the oil circuit mounting block (4) is provided with an A oil circuit port (41) and a B oil circuit port (42) respectively. The ports of the A oil circuit port (41) and the B oil circuit port (42) extending into the cylinder body (1) are both equipped with a buffer mechanism (7). A rod end cap (53) is fixedly installed at one end inside the cylinder body (1), and a buffer ring (55) is fixedly installed inside the rod end cap (53).

2. The integrated hydraulic cylinder with a buffer type for a high horse power tractor according to claim 1, wherein: A valve core (45) is fixedly installed inside the oil circuit mounting block (4) at the positions of oil circuit A (41) and oil circuit B (42). A valve sleeve (46) is installed at one end of the valve core (45). A drum-shaped ring (451) is fixedly installed on the outside of one end of the valve core (45). A dumbbell ring (461) is installed on the outer ring of the valve sleeve (46). An oil seal (462) is installed between the inside of the valve sleeve (46) and the valve core (45). One end of the valve sleeve (46) extends out of the oil circuit mounting block (4) and is positioned and installed by the front end cover (43). A dustproof ring (48) is provided at the end of the front end cover (43). A rubber protective cap (47) is installed at the end of the front end cover (43).

3. The integrated hydraulic cylinder with a buffer type for a high horse power tractor according to claim 1, wherein: A sealing box (6) is fixedly installed on the inner wall of the cylinder (1) at the location of the buffer mechanism (7). The B oil port (42) extends into the cylinder (1) and is provided with an oil passage (421). The A oil port (41) is connected to the other end of the cylinder (1) through an extension oil pipe (44).

4. The integrated hydraulic cylinder with buffer for high-horsepower tractors according to claim 3, characterized in that: The buffer mechanism (7) includes a positioning ring frame (71) arranged around the outside of the oil passage (421), a rubber block (72) fixedly installed at the bottom of the positioning ring frame (71), and an oil injection ring (73) connected at both ends to the bottom of the rubber block (72). Four sets of connecting springs (75) are installed between the bottom of the positioning ring frame (71) and the inner wall of the sealing box (6). The top of the oil injection ring (73) is provided with an extension (74) placed in the oil passage (421).

5. The integrated hydraulic cylinder with buffer for high-horsepower tractors according to claim 1, characterized in that: A combination oil seal (51) is fixedly installed around the outside of the piston (5), a sealing ring (54) is fixedly installed around the outside of the rod end cap (53), and multiple sets of sealing rubber rings and a set of wear-resistant rings (56) are fixedly installed on both sides of the inner ring of the rod end cap (53) on the buffer ring (55).

6. The integrated hydraulic cylinder with buffer for high-horsepower tractors according to claim 1, characterized in that: The inner rings of the cylinder bottom (2) and the rod head (3) are both equipped with bearing sleeves (31) for docking, and the top of the cylinder bottom (2) is provided with an oil cup (21).

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