Guide structure of hydraulic oil cylinder

Abstract

The utility model discloses a hydraulic oil cylinder guide structure, which belongs to the technical field of hydraulic oil cylinders and comprises a hydraulic cylinder body and a cylinder cover detachably mounted on the end face of the hydraulic cylinder body, a cavity is defined by the inner wall of the hydraulic cylinder body and one side of the cylinder cover, and a piston is slidably sleeved in the cavity. A connecting rod is arranged between the piston and the cylinder cover in a sliding mode, one end of the connecting rod penetrates through a through groove formed in the cylinder cover, and a sealing piece is arranged between the connecting rod and the through groove. The piston and the connecting rod are integrally designed, the guide hole formed in the axial direction of the piston and the connecting rod is used in cooperation with the guide rod, the guide hole cannot communicate with the space, located on the two sides of the piston, in the cavity, and only part of the surface of the outer portion of the guide rod makes contact with the inner wall of the guide hole. Therefore, the guide effect can be provided for the piston when the piston moves, the situation that normal operation of the piston is affected due to the fact that the guide hole is communicated with the space on the two sides of the piston due to friction loss is avoided, and the sealing performance and the service life of the piston are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a guiding structure of a hydraulic cylinder. Background Technique

[0002] A hydraulic cylinder is a widely used industrial automation device, which is mainly composed of a cylinder body, a piston and a piston rod, etc., and is a power source for driving an object to move. According to the magnitude of its output force, it can be used in automated processing equipment for precision machining, and can also be used in forging, cutting and other equipment for processing large parts, and can also be used in related equipment for crushing and extrusion. The application scenarios are relatively wide. The piston rod is both a connecting member between the piston and the driven member and a guiding auxiliary member of the piston. Since the piston and the piston rod are in a split connection relationship and the degree of freedom constraint at the connection is poor, during long-term use, the connection between the two is prone to looseness. To solve the above problems, a guiding structure is added in the existing hydraulic cylinder, which can not only well constrain the degree of freedom at the connection between the two, but also further guide the piston, improve its guiding accuracy and reduce its wear rate.

[0003] The existing patent application number: 202321076875.0 discloses a guiding structure of a hydraulic cylinder. This device uses a guiding column and a through hole provided on the piston in cooperation to assist in guiding the linear movement of the piston and improve the accuracy of the piston movement direction. In the above existing technology, since the through hole penetrates both sides of the piston, when the second seal is severely worn, the sealing performance between the through hole and the guiding column will decrease, and the inner cavities on the left and right sides of the cylinder body are likely to communicate with each other, affecting the normal operation of the piston. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a guiding structure of a hydraulic cylinder to solve the problem that the wear of the second seal affects the sealing performance between the through hole and the guiding column, and it is easy to cause the inner cavities on the left and right sides of the cylinder body to communicate with each other and affect the normal operation of the piston as mentioned in the above background technique.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme:

[0006] A guiding structure of a hydraulic cylinder provided by the utility model includes a hydraulic cylinder body and a cylinder head detachably installed on the end face of the hydraulic cylinder body. A cavity is formed by enclosing the inner wall of the hydraulic cylinder body and one side of the cylinder head. A piston is slidably sleeved in the cavity. A connecting rod is slidably arranged between the piston and the cylinder head. One end of the connecting rod passes through a through groove provided on the cylinder head. A seal is provided between the connecting rod and the through groove. The remaining end of the connecting rod is fixed on the piston. The guiding structure of the hydraulic cylinder further includes:

[0007] A guide rod fixedly connected to a side groove provided on an inner wall of the cavity, one end of the guide rod is slidably inserted into a guide hole provided on the piston, and the guide hole extends axially along the piston into the connecting rod, the guide hole does not penetrate the connecting rod, and the guide hole and the guide rod are used to guide the moving direction of the piston.

[0008] Further, the hydraulic cylinder guiding structure further includes:

[0009] A threaded collar threadedly sleeved on the free end of the connecting rod.

[0010] An external ring fixedly connected to an external device at one end face of the threaded collar, an inner embedding groove is formed by enclosing the outside of the external ring and the inside of the threaded collar.

[0011] A threaded post fixed in the inner embedding groove, the threaded post is threadedly connected to a connection hole provided on the end face of the connecting rod.

[0012] Further, the hydraulic cylinder guiding structure further includes:

[0013] A plurality of mounting holes provided on the cylinder head.

[0014] A connection bolt threadedly mounted in the mounting hole, one end of the connection bolt passes through the mounting hole and is threadedly connected to a threaded hole provided on the end face of the hydraulic cylinder body.

[0015] Further, the bolt head on the connection bolt is located in the mounting hole, and the cross-sectional shape of the mounting hole is convex.

[0016] Further, the hydraulic cylinder guiding structure further includes:

[0017] A sealing washer sleeved with a sealing ring groove provided on the end face of the hydraulic cylinder body.

[0018] A sealing pressure ring fixed on the cylinder head, one side of the sealing pressure ring is sleeved with a sealing groove provided on the sealing washer.

[0019] Further, the material of the sealing washer is an elastic rubber body, and the sealing washer matches the sealing pressure ring.

[0020] Compared with the prior art, the above one or more technical solutions have the following beneficial effects:

[0021] 1. The utility model, through the integrated design of the piston and the connecting rod and the cooperative use of the guiding holes and guiding rods arranged axially along the two, and the guiding holes cannot communicate with the spaces on both sides of the piston in the cavity, and only part of the outer surface of the guiding rod contacts the inner wall of the guiding hole, can not only provide a guiding effect for the piston when it moves, but also prevent the guiding holes from communicating with the spaces on both sides of the piston due to frictional wear, thus affecting its normal operation, and improve the piston sealing performance and service life;

[0022] 2. Through the detachable installation design between the connecting rod and the external ring, and between the cylinder head and the hydraulic cylinder body, the utility model can not only facilitate the simple and rapid disassembly and replacement of the sealing ring when the sealing ring outside the piston is severely worn, but also, through the cooperative use of the sealing washer, sealing ring groove, sealing pressure ring and sealing groove, highly seal between the cylinder head and the hydraulic cylinder body when the cylinder head is installed, and improve the sealing performance between the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is the partial front elevation sectional view of the utility model;

[0024] Figure 2 is the left elevation sectional view of the utility model;

[0025] Figure 3 is the right view of the threaded collar in the utility model;

[0026] Figure 4 is the front elevation half-sectional view of the utility model;

[0027] Figure 5 is Figure 4 the enlarged view of part A in

[0028] In the figure: 1. Hydraulic cylinder body; 2. Cavity; 3. Piston; 4. Connecting rod; 5. Guiding hole; 6. Guiding rod; 7. Side groove; 8. Cylinder head; 9. Threaded collar; 10. External ring; 11. Embedded groove; 12. Threaded post; 13. Connecting hole; 14. Mounting hole; 15. Connecting bolt; 16. Threaded hole; 17. Sealing ring groove; 18. Sealing washer; 19. Sealing pressure ring; 20. Sealing groove; 21. First control valve; 22. Infusion pipe; 23. Second control valve; 24. Drain pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] In order to enable those skilled in the art to better understand the solution of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application.

[0030] Such as Figures 1 to 5As shown in the figure, a hydraulic cylinder guiding structure includes a hydraulic cylinder body 1 and a cylinder head 8 detachably installed on the end face of the hydraulic cylinder body 1. A second control valve 23 is embedded on the side of the cylinder head 8 opposite to the hydraulic cylinder body 1. There is a drain pipe 24 between one port of the second control valve 23 and the outside of the cylinder head 8. A cavity 2 is formed by enclosing the inner wall of the hydraulic cylinder body 1 and one side of the cylinder head 8. A piston 3 is slidably sleeved in the cavity 2. A connecting rod 4 is slidably arranged between the piston 3 and the cylinder head 8. One end of the connecting rod 4 passes through a through groove provided on the cylinder head 8, and a seal is provided between the connecting rod 4 and the through groove. The remaining end of the connecting rod 4 is fixed to the piston 3. The hydraulic cylinder guiding structure further includes:

[0031] A guiding rod 6 fixedly connected to a side groove 7 provided on the inner wall of one side of the cavity 2. A first control valve 21 is fixedly arranged in the side groove 7. There is an infusion pipe 22 between the first control valve 21 and the outside of the hydraulic cylinder body 1, which is convenient for controlling the filling and release of the liquid between the piston 3 and the side groove 7. Cooperating with the synchronous use of the second control valve 23 and the drain pipe 24, the telescopic movement of the connecting rod 4 in the axial direction of the hydraulic cylinder body 1 is realized. One end of the guiding rod 6 is slidably inserted into a guiding hole 5 provided on the piston 3, and the guiding hole 5 extends along the axial direction of the piston 3 into the connecting rod 4. The guiding hole 5 does not penetrate the connecting rod 4. The guiding hole 5 and the guiding rod 6 are used to guide the moving direction of the piston 3.

[0032] Through the integrated design of the piston 3 and the connecting rod 4 and the cooperation of the guiding hole 5 and the guiding rod 6 arranged along their axial directions, and the guiding hole 5 cannot communicate with the spaces on both sides of the piston 3 in the cavity, and only part of the outer surface of the guiding rod 6 contacts the inner wall of the guiding hole 5, it can not only provide a guiding effect for the piston 3 when it moves, but also prevent the guiding hole 5 from being connected to the spaces on both sides of the piston 3 due to friction loss, which affects its normal operation, improves the sealing performance of the piston 3 and extends its service life.

[0033] In this embodiment, the hydraulic cylinder guiding structure further includes:

[0034] A threaded collar 9 threadedly sleeved on the free end of the connecting rod 4.

[0035] An external ring 10 fixed to one end face of the threaded collar 9 to connect an external device. An embedded groove 11 is formed by enclosing the outside of the external ring 10 and the inside of the threaded collar 9.

[0036] A threaded post 12 fixed in the embedded groove 11. The threading direction of the threaded post 12 is the same as that of the threaded collar 9. The threaded post 12 is threadedly connected to a connection hole 13 provided on the end face of the connecting rod 4.

[0037] During disassembly and repair, the external ring 10 can be first unscrewed and removed from the free end of the connecting rod 4, reducing the difficulty of disassembly and installation between the connecting rod 4 and the driven part, improving the efficiency of disassembly and installation, and facilitating the subsequent disassembly and maintenance of the piston 3. After the piston 3 and the cylinder head 8 are installed, one end of the connecting rod 4 will pass through the cylinder head 8 and extend to the outside of the hydraulic cylinder body 1. By screwing the external ring 10, it is fixedly installed at the free end of the connecting rod 4. Through the double-thread connection between the threaded post 12 and the connection hole 13, and the threaded sleeve ring 9 and one end of the connecting rod 4, both the connection stability between the external ring 10 and the connecting rod 4 and the connection strength between the two can be improved.

[0038] In this embodiment, the hydraulic cylinder guiding structure further includes:

[0039] A plurality of mounting holes 14 provided on the cylinder head 8.

[0040] The connecting bolts 15 are threadedly installed in the mounting holes 14. One end of the connecting bolts 15 passes through the mounting holes 14 and is threadedly connected to the screw holes 16 provided on the end face of the hydraulic cylinder body 1.

[0041] The bolt heads of the connecting bolts 15 are located in the mounting holes 14, and the cross-sectional shape of the mounting holes 14 is convex.

[0042] The cylinder head 8 and the hydraulic cylinder body 1 can be fixedly installed as a whole through a plurality of connecting bolts 15. Or when maintenance and repair are required inside the hydraulic cylinder body 1, through the disassembly of the connecting bolts 15, the maintenance and repair operations inside the hydraulic cylinder body 1 can be quickly completed, and the operation is simple and fast.

[0043] In this embodiment, the hydraulic cylinder guiding structure further includes:

[0044] A sealing gasket 18 sleeved with the sealing ring groove 17 provided on the end face of the hydraulic cylinder body 1.

[0045] A sealing pressure ring 19 fixed on the cylinder head 8, and one side of the sealing pressure ring 19 is sleeved with the sealing groove 20 provided on the sealing gasket 18.

[0046] The material of the sealing gasket 18 is an elastic rubber body, and the sealing gasket 18 matches the sealing pressure ring 19.

[0047] When the cylinder head 8 is installed, as the connecting bolt 15 is tightened, the extrusion force between the sealing pressure ring 19 and the sealing washer 18 increases until the connecting bolt 15 is difficult to turn. At this time, under the action of the extrusion force, the two sides of the sealing washer 18 are closely attached to the inner walls of the sealing pressure ring 19 and the sealing ring groove 17 respectively, improving the sealing performance between the cylinder head 8 and the end face of the hydraulic cylinder block 1. Moreover, by the matching use of the sealing groove 20 and the sealing pressure ring 19, the degree of freedom of the cylinder head 8 can be radially restricted during the installation of the cylinder head 8, improving the precision of the close fit between the sealing groove 20 and the sealing pressure ring 19, and avoiding misalignment that may affect the sealing effect.

[0048] The above are only the preferred embodiments of the present invention, and the parts not described in the present invention can be implemented by adopting or referring to the existing technologies. Of course, the above description is not a limitation to the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by those skilled in the art within the essence of the present invention should also fall within the protection scope of the present invention.

Claims

1. A hydraulic cylinder guide structure, comprising a hydraulic cylinder body (1) and a cylinder head (8) detachably mounted on the end surface of the hydraulic cylinder body (1), wherein the inner wall of the hydraulic cylinder body (1) and one side of the cylinder head (8) enclose a cavity (2), a piston (3) is slidably mounted in the cavity (2), a connecting rod (4) is slidably arranged between the piston (3) and the cylinder head (8), one end of the connecting rod (4) passes through a through groove arranged on the cylinder head (8), a sealing member is arranged between the connecting rod (4) and the through groove, and the remaining end of the connecting rod (4) is fixed on the piston (3), characterized in that: The hydraulic cylinder guide structure also includes: A guide rod (6) is fixedly connected to a side groove (7) provided on an inner wall of one side of the cavity (2); one end of the guide rod (6) is slidably plugged into a guide hole (5) provided on the piston (3); and the guide hole (5) extends into the connecting rod (4) along the axial direction of the piston (3); the guide hole (5) does not penetrate the connecting rod (4); and the guide hole (5) and the guide rod (6) are used to guide the moving direction of the piston (3).

2. The hydraulic cylinder guide structure according to claim 1, characterized in that: The hydraulic cylinder guide structure also includes: A threaded collar (9) threadedly sleeved on the free end of the connecting rod (4); An external connecting ring (10) fixed to one end face of the threaded collar (9) and connected to an external device, wherein the exterior of the external connecting ring (10) and the interior of the threaded collar (9) are combined to form an embedded groove (11); A threaded column (12) is fixed in the embedded groove (11), and the threaded column (12) is threadedly connected to a connecting hole (13) provided on the end surface of the connecting rod (4).

3. The hydraulic cylinder guide structure according to claim 2, characterized in that: The hydraulic cylinder guide structure also includes: A plurality of mounting holes (14) provided on the cylinder cover (8); A connecting bolt (15) is threadedly mounted in the mounting hole (14), one end of the connecting bolt (15) passes through the mounting hole (14) and is threadedly connected to a screw hole (16) provided on the end surface of the hydraulic cylinder body (1).

4. The hydraulic cylinder guide structure according to claim 3, characterized in that: The bolt cap on the connecting bolt (15) is located in the mounting hole (14), and the cross-sectional shape of the mounting hole (14) is a convex shape.

5. The hydraulic cylinder guide structure according to claim 4, characterized in that: The hydraulic cylinder guide structure also includes: A sealing gasket (18) fitted into a sealing ring groove (17) provided on the end surface of the hydraulic cylinder body (1); A sealing pressure ring (19) is fixed on the cylinder head (8), and one side of the sealing pressure ring (19) is sleeved with a sealing groove (20) provided on the sealing gasket (18).

6. The hydraulic cylinder guide structure according to claim 5, characterized in that: The sealing gasket (18) is made of elastic rubber, and the sealing gasket (18) matches the sealing pressure ring (19).

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