High performance wear resistant hydraulic cylinder

Abstract

The utility model discloses a kind of high-performance wear-resistant hydraulic oil cylinders, it is related to hydraulic oil cylinder technical field, including cylinder body, the hydraulic cavity is opened in the cylinder body, the piston is slidably arranged in the hydraulic cavity, the one end center of the piston is detachably fixedly connected with piston rod along axial direction, the cooling channel one that can be supplied with cooling liquid flow is opened in the piston rod inside, the piston includes base body, annular groove one and multiple annular grooves two are opened on the circumference of the base body, each annular groove two is all sleeved with guide ring, annular groove one is sleeved with sealing ring three, the cooling channel two that can be supplied with cooling liquid flow is opened in the base body, the cooling channel one and cooling channel two are all cylindrical helix line type cavity, the device has the characteristics of improving the use efficiency of hydraulic oil cylinder.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic cylinder technology, specifically a high-performance wear-resistant hydraulic cylinder. Background Technology

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion (or oscillating motion). It has a simple structure and reliable operation. When used to achieve reciprocating motion, it eliminates the need for a speed reduction device and has no transmission backlash, resulting in smooth movement. Therefore, it is widely used in the hydraulic systems of various machines. The output force of a hydraulic cylinder is proportional to the effective area of ​​the piston and the pressure difference between its two sides. There are three main types of hydraulic cylinders: piston cylinders, plunger cylinders, and oscillating cylinders. Piston cylinders and plunger cylinders achieve reciprocating linear motion, outputting speed and thrust, while oscillating cylinders achieve reciprocating oscillation, outputting angular velocity and torque.

[0003] During operation, existing hydraulic cylinders generate heat through friction between the guide ring on the piston and the inner wall of the cylinder, and between the piston rod and the inner wall of the guide sleeve. This high temperature inside the cylinder prevents continuous operation and reduces the efficiency of the hydraulic cylinder. Therefore, it is necessary to design a high-performance wear-resistant hydraulic cylinder to improve the efficiency of hydraulic cylinders. Utility Model Content

[0004] The purpose of this invention is to provide a high-performance wear-resistant hydraulic cylinder to address the shortcomings of existing technologies and solve the problems mentioned in the background section.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a high-performance wear-resistant hydraulic cylinder, including a cylinder body, a hydraulic chamber is formed in the cylinder body, a piston is slidably arranged in the hydraulic chamber, a piston rod is detachably and fixedly connected to the center of one end of the piston along the axial direction, a cooling channel I for coolant flow is formed inside the piston rod, the piston includes a base, an annular groove I and multiple annular groove II are formed on the circumferential surface of the base, a guide ring is sleeved in each annular groove II, a sealing ring III is sleeved in the annular groove I, and a cooling channel II for coolant flow is formed in the base, both the cooling channel I and the cooling channel II are cylindrical spiral-shaped cavities.

[0006] This utility model further explains that the cooling channel one, with its port away from the piston along the piston rod axis, is the input end, and the cooling channel one, with its port away from the piston along the piston rod axis, is the output end. The portion of the piston rod located outside the cylinder body has a cooling hole one, which is connected to the input end of the cooling channel one. The piston rod also has a liquid outlet channel one, with its port near the piston connected to the output end of the cooling channel one. The portion of the piston rod located outside the cylinder body has a liquid outlet hole, and the port of the liquid outlet channel one located away from the piston is connected to the liquid outlet hole.

[0007] This utility model further explains that the side of the second cooling channel closer to the piston rod along the piston axis is the input end, and the side of the second cooling channel away from the piston rod along the piston axis is the output end. A liquid inlet channel is jointly provided in the base and the piston rod. The end of the liquid inlet channel away from the piston rod is connected to the input end of the second cooling channel. The end of the liquid inlet channel away from the piston passes through the piston rod to form an inlet for coolant to enter. A second liquid outlet channel is jointly provided in the base and the piston rod. The end of the second liquid outlet channel away from the piston rod is connected to the output end of the second cooling channel. The end of the second liquid outlet channel away from the piston is connected to the liquid outlet hole.

[0008] The present invention further describes that a cylinder cover is detachably and sealingly installed at one end of the cylinder body along the axial direction. A central hole is provided on the cylinder cover. A sealing ring is embedded in the central hole on the side of the central hole closer to the piston along the axial direction. A dustproof ring is embedded in the central hole on the side of the central hole away from the piston along the axial direction. Both the sealing ring and the dustproof ring are in direct contact with the piston rod.

[0009] The present invention further illustrates that a guide sleeve is embedded in the inner wall of the cylinder body at one end near the cylinder head along the axial direction. The guide sleeve is fitted onto the piston rod. A second sealing ring is embedded at both ends of the guide sleeve along the axial direction. The second sealing ring is in direct contact with the piston rod.

[0010] The present invention further describes that a cylinder seat is detachably and sealed at one end of the cylinder body away from the cylinder head along the axial direction. A hydraulic oil inlet and outlet channel is provided in the cylinder seat, and the output end of the channel is connected to the hydraulic chamber. An inlet port for hydraulic oil inlet and outlet is provided on one side of the cylinder body near the bushing along the axial direction.

[0011] The present invention further explains that there are six annular grooves II, and the annular grooves II are arranged in groups of three to form annular groove groups, which are respectively arranged at both ends of the substrate along the axial direction. The three annular grooves II in the same annular groove group are linearly and evenly arranged along the axis of the substrate, and the distance between two adjacent annular grooves II is 10mm.

[0012] Compared with the prior art, the beneficial effects achieved by this utility model are as follows: This utility model absorbs the heat generated by the friction of the piston rod by setting a pair of cooling channels, and absorbs the heat generated by the friction of the guide ring and sealing ring connected to the base by setting a second cooling channel, thereby cooling the piston and piston rod during the operation of the hydraulic cylinder and improving the efficiency of the hydraulic cylinder. Attached Figure Description

[0013] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0014] Figure 1 This is a schematic cross-sectional view of the overall side structure of this utility model;

[0015] Figure 2 This is the utility model Figure 1 A magnified schematic diagram of the structure of region A;

[0016] Figure 3 This is the utility model Figure 1 A magnified schematic diagram of the local structure of region B;

[0017] In the diagram: 1. Cylinder body; 2. Hydraulic chamber; 3. Piston; 4. Piston rod; 5. Cylinder head; 6. Center hole; 7. Sealing ring one; 8. Dustproof ring; 9. Guide sleeve; 10. Sealing ring two; 11. Cylinder seat; 12. Flow channel; 13. Liquid inlet; 14. Base; 15. Annular groove one; 16. Sealing ring three; 17. Annular groove two; 18. Guide ring; 19. Liquid outlet channel two; 20. Cooling channel one; 21. Cooling hole one; 22. Liquid outlet channel one; 23. Liquid outlet hole; 24. Cooling channel two; 25. Liquid inlet channel. Detailed Implementation

[0018] The following detailed, non-limiting description of the present invention, in conjunction with preferred embodiments and accompanying drawings, is provided. Obviously, the described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0019] Please see Figure 1-3 The present invention provides a technical solution: a high-performance wear-resistant hydraulic cylinder, including a cylinder body 1, which is cylindrical, and a hydraulic chamber 2 is provided inside the cylinder body 1. A piston 3 is slidably arranged in the hydraulic chamber 2, and a piston rod 4 is detachably installed at the center of one end of the piston 3 along the axial direction.

[0020] A cylinder head 5 is detachably and sealed at one end of the cylinder body 1 along the axial direction. A central hole 6 is provided on the cylinder head 5. A sealing ring 7 is embedded on the side of the central hole 6 near the piston 3 along the axial direction, and a dustproof ring 8 is embedded on the side of the central hole 6 away from the piston 3 along the axial direction. Both the sealing ring 7 and the dustproof ring 8 are in direct contact with the piston rod 4.

[0021] A guide sleeve 9 is embedded in the inner wall of the cylinder body 1 at the end closest to the cylinder head 5 along the axial direction. The end of the piston rod 4 away from the piston 3 passes through the guide sleeve 9 and the central hole 6 in sequence and protrudes out of the outer side of the cylinder body 1.

[0022] The guide sleeve 9 is fitted onto the piston rod 4. Both ends of the guide sleeve 9 along the axial direction are fitted with sealing rings 10. The sealing rings 10 are in direct contact with the piston rod 4, thereby making the piston rod 4 and the guide sleeve 9 in a sealed sliding connection.

[0023] A cylinder seat 11 is detachably and sealed at one end of the cylinder body 1 away from the cylinder head 5 along the axial direction. A flow channel 12 is provided inside the cylinder seat 11. The output end of the flow channel 12 is connected to the hydraulic chamber 2. The flow channel 12 is used for the inlet and outlet of hydraulic oil.

[0024] The cylinder body 1 has an inlet 13 on the side near the bushing along the axial direction, which is used for the inlet and outlet of hydraulic oil.

[0025] The piston 3 includes a base 14, which is cylindrical. An annular groove 15 is formed on the circumferential surface of the base 14. A sealing ring 16 is fitted inside the annular groove 15 and is in direct contact with the inner wall of the hydraulic chamber 2.

[0026] Both ends of the substrate 14 along the axial direction are provided with annular groove groups. Each annular groove group includes three annular grooves 17. The three annular grooves 17 in the same annular groove group are arranged linearly and evenly along the axis of the substrate 14, and the distance between two adjacent annular grooves 17 is 10mm.

[0027] Each annular groove 17 is embedded with a guide ring 18, which guides the movement of the piston 3 and ensures that the piston 3 moves smoothly along the axis in the hydraulic chamber 2. The guide ring 18 is made of non-metallic material, which can reduce the direct metal contact between the outer circumferential surface of the piston 3 and the inner wall of the hydraulic chamber 2. The guide ring 18 is made of materials including but not limited to polytetrafluoroethylene, nylon, phenolic resin, etc. The material of the guide ring 18 has self-lubricating properties, which can reduce friction and heat generation during movement.

[0028] The guide ring 18 is an open guide ring that can be manually opened and fitted into the annular groove 17.

[0029] The piston rod 4 has a cooling channel 20 inside. The cooling channel 20 is a cylindrical spiral cavity with an inner diameter of 10mm. The distance between the side wall of the cooling channel 20 away from the axis of the piston rod 4 and the outer circumferential surface of the piston rod 4 is 5mm. The side of the cooling channel 20 away from the piston 3 along the axis of the piston rod 4 is the input end, and the side of the cooling channel 20 away from the piston 3 along the axis of the piston rod 4 is the output end.

[0030] The piston rod 4 located outside the cylinder 1 has a cooling hole 21. The cooling hole 21 is connected to the input end of the cooling channel 20 and is used to introduce coolant. The piston rod 4 also has an outlet channel 22. The cross-section of the outlet channel 22 along the radial direction of the piston rod 4 is "L". The port of the outlet channel 22 near the piston 3 is connected to the output end of the cooling channel 20. The piston rod 4 located outside the cylinder 1 has an outlet hole 23. The outlet hole 23 is used for coolant to flow out. The port of the outlet channel 22 away from the piston 3 is connected to the outlet hole 23.

[0031] Cooling channel 24 is provided inside the base 14. Cooling channel 24 is composed of a cylindrical spiral cavity. The inner diameter of cooling channel 24 is 10mm. The distance between the side wall of cooling channel 24 away from its axis in the radial direction of the base 14 and the circumferential surface of the annular groove 15 is 5mm.

[0032] The side of cooling channel 24 closest to piston rod 4 along the axis of piston 3 is the input end, and the side of cooling channel 24 furthest from piston rod 4 along the axis of piston 3 is the output end.

[0033] The base 14 and the piston rod 4 are both provided with a liquid inlet channel 25. The cross section of the liquid inlet channel 25 along the radial direction of the piston 3 is concave. The end of the liquid inlet channel 25 away from the piston rod 4 is connected to the input end of the cooling channel 24. The end of the liquid inlet channel 25 away from the piston 3 passes through the piston rod 4 to form an inlet for the coolant to enter.

[0034] The base 14 and the piston rod 4 are both provided with a liquid outlet channel 2 19. The cross section of the liquid outlet channel 2 19 along the radial direction of the piston 3 is concave. The end of the liquid outlet channel 2 19 away from the piston rod 4 is connected to the output end of the cooling channel 2 24, and the end of the liquid outlet channel 2 19 away from the piston 3 is connected to the liquid outlet hole 23.

[0035] The inner wall of the hydraulic chamber 2 is provided with a tungsten carbide alloy layer, a micro-arc oxidation ceramic layer, and a DLC (Diamond-like Carbon) coating layer from the outside to the inside.

[0036] The tungsten carbide alloy layer has a thickness of 0.3-0.5 mm and exhibits good resistance to mechanical wear, impact resistance, and thermal stability.

[0037] The micro-arc oxidation ceramic layer has a thickness of 20-30 micrometers, which has good corrosion resistance and low thermal conductivity, effectively preventing the frictional heat generated in the hydraulic cavity 2 from being transferred to the cylinder 1, thereby reducing the risk of thermal deformation of the cylinder 1.

[0038] The DLC coating layer has a thickness of 2-5 micrometers and an ultra-low coefficient of friction of 0.05-0.1, thereby reducing the resistance of the piston 3 moving in the hydraulic chamber 2; it has anti-adhesive wear properties, and its amorphous carbon structure can avoid cold welding caused by direct metal contact between the piston 3 and the cylinder 1; it is chemically inert and has the effect of resisting the corrosion of hydraulic oil oxidation decomposition products, thereby extending the life of the cylinder 1.

[0039] In this embodiment, hydraulic oil is alternately injected into the hydraulic chamber 3 through the flow channel 12 and the inlet 13, thereby controlling the piston 3 to move along the hydraulic chamber 2, and further driving the piston rod 4 to move.

[0040] During the operation of the hydraulic cylinder, coolant is introduced into the cooling channel 20 through the cooling hole 21, so that the coolant flowing in the cooling channel 20 absorbs the heat generated by the friction of the piston rod 4 surface and flows out from the outlet hole 23 through the outlet channel 22.

[0041] Meanwhile, by introducing coolant into the inlet channel 25, the coolant flows into the second cooling channel 24 through the inlet channel 25. The heat generated by the friction between the guide ring 18 and the third sealing ring 16 and the inner wall of the hydraulic chamber 2 is transferred through the base 14 and absorbed by the coolant. The coolant flows out through the second outlet channel 19 and merges with the coolant flowing into the first outlet channel 22 in the outlet hole 23.

[0042] This absorbs the heat generated by friction between piston 3 and piston rod 4 during their movement, thereby cooling piston 3 and piston rod 4 and improving the working efficiency of the hydraulic cylinder.

[0043] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A high-performance wear-resistant hydraulic cylinder, characterized in that: The cylinder (1) includes a hydraulic chamber (2) inside the cylinder (1), a piston (3) is slidably disposed inside the hydraulic chamber (2), a piston rod (4) is detachably fixedly connected to the center of one end of the piston (3) along the axial direction, a cooling channel (20) for coolant flow is provided inside the piston rod (4), the piston (3) includes a base (14), an annular groove (15) and multiple annular grooves (17) are provided on the circumferential surface of the base (14), a guide ring (18) is fitted inside each annular groove (15), a sealing ring (16) is fitted inside the annular groove (15), a cooling channel (24) for coolant flow is provided inside the base (14), and both the cooling channel (20) and the cooling channel (24) are cylindrical spiral-shaped channels.

2. The high-performance wear-resistant hydraulic cylinder according to claim 1, characterized in that: The cooling channel 1 (20) has an input end on the side away from the piston (3) along the axis of the piston rod (4), and an output end on the side away from the piston (3) along the axis of the piston rod (4). The piston rod (4) located outside the cylinder (1) has a cooling hole 1 (21) which is connected to the input end of the cooling channel 1 (20). The piston rod (4) has a liquid outlet channel 1 (22) located inside the piston rod (4). The port of the liquid outlet channel 1 (22) near the piston (3) is connected to the output end of the cooling channel 1 (20). The piston rod (4) located outside the cylinder (1) has a liquid outlet hole (23) which is connected to the port of the liquid outlet channel 1 (22) away from the piston (3).

3. The high-performance wear-resistant hydraulic cylinder according to claim 2, characterized in that: The cooling channel 2 (24) has an input end on the side of the piston rod (4) along the axis of the piston (3), and an output end on the side of the cooling channel 2 (24) away from the piston rod (4) along the axis of the piston (3). The base (14) and the piston rod (4) are provided with a liquid inlet channel (25). The end of the liquid inlet channel (25) away from the piston rod (4) is connected to the input end of the cooling channel 2 (24). The end of the liquid inlet channel (25) away from the piston (3) passes through the piston rod (4) to form an inlet for the coolant to enter. The base (14) and the piston rod (4) are provided with a liquid outlet channel 2 (19). The end of the liquid outlet channel 2 (19) away from the piston rod (4) is connected to the output end of the cooling channel 2 (24). The end of the liquid outlet channel 2 (19) away from the piston (3) is connected to the liquid outlet hole (23).

4. A high-performance wear-resistant hydraulic cylinder according to claim 3, characterized in that: The cylinder body (1) is detachably and sealed at one end along the axial direction with a cylinder cover (5). The cylinder cover (5) has a central hole (6). A sealing ring (7) is embedded in the side of the central hole (6) close to the piston (3) along the axial direction. A dustproof ring (8) is embedded in the side of the central hole (6) away from the piston (3) along the axial direction. Both the sealing ring (7) and the dustproof ring (8) are in direct contact with the piston rod (4).

5. A high-performance wear-resistant hydraulic cylinder according to claim 4, characterized in that: The cylinder body (1) has a guide sleeve (9) embedded in the inner wall of one end near the cylinder head (5) along the axial direction. The guide sleeve (9) is fitted on the piston rod (4). Both ends of the guide sleeve (9) along the axial direction are embedded with sealing rings (10). The sealing rings (10) are in direct contact with the piston rod (4).

6. A high-performance wear-resistant hydraulic cylinder according to claim 5, characterized in that: The cylinder body (1) is detachably and sealed at one end away from the cylinder head (5) along the axial direction. The cylinder seat (11) has a hydraulic oil inlet and outlet channel (12) inside. The output end of the channel (12) is connected to the hydraulic chamber (2). The cylinder body (1) has a hydraulic oil inlet and outlet port (13) on the side near the bushing along the axial direction.

7. A high-performance wear-resistant hydraulic cylinder according to claim 6, characterized in that: There are six annular grooves (17). The three annular grooves (17) are arranged in a group to form annular groove groups, which are respectively set at both ends of the base (14) along the axial direction. The three annular grooves (17) in the same annular groove group are arranged linearly and evenly along the axis of the base (14), and the distance between two adjacent annular grooves (17) is 10mm.

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