Leak-proof device for hydraulic oil cylinder

Abstract

The utility model relates to the technical field of hydraulic oil cylinders, in particular to a leakproof device for a hydraulic oil cylinder, which can enable an external oil pipe to be connected with an oil inlet pipe and an oil outlet pipe more firmly, effectively avoid looseness of a joint caused by shaking of the oil pipe, prevent leakage at the joint of the oil pipe and improve practicability. Comprising a cylinder barrel, a piston rod is movably connected into the cylinder barrel, a cylinder cover is fixedly connected to the top end of the cylinder barrel, the piston rod is sleeved with the cylinder cover, an oil inlet pipe and an oil outlet pipe are fixedly communicated with the outside of the cylinder barrel, and installation pieces are installed on the oil inlet pipe and the oil outlet pipe; external threads are arranged on the outer wall of the clamping ring, four sets of avoiding grooves are formed in the clamping ring at equal intervals, internal threads are arranged on the inner wall of the locking sleeve, the locking sleeve is arranged on the clamping ring in a threaded and sleeving mode through matching of the internal threads and the external threads, and the outer side of the front edge of the clamping ring and the inner side and the outer side of the front edge of the locking sleeve are each of an elliptical surface structure.

Description

Technical Field

[0001] This utility model relates to the technical field of hydraulic cylinders, and in particular to a leak-proof device for hydraulic cylinders. Background Technology

[0002] A hydraulic cylinder is a hydraulic actuator that converts hydraulic energy into mechanical energy and performs linear reciprocating motion. It is a commonly used hydraulic component in hydraulic systems.

[0003] To prevent leakage during the use of hydraulic cylinders, leak-proof devices are usually installed. Existing leak-proof devices for hydraulic cylinders, such as the one disclosed in utility model patent CN219452573U, include a cylinder body comprising a cylinder barrel and a piston rod. A piston seal is fixedly connected to one end of the piston rod, and an anti-wear sleeve is fixedly connected to the outside of the piston seal. The anti-wear sleeve is movably connected to the inner wall of the cylinder barrel. This utility model, through the cooperation of the anti-wear sleeve, groove, movable rod, limiting groove, and limiting rod, utilizes the properties of the anti-wear sleeve to reduce friction with the cylinder barrel. The piston seal drives the limiting rod outside the movable rod to move within the limiting groove opened inside the groove, facilitating the reduction of friction between the anti-wear sleeve and the cylinder barrel. This solves the problem of repeated piston rod extension and retraction causing friction with the cylinder barrel and affecting the service life of the hydraulic cylinder in existing leak-proof devices.

[0004] While the anti-leakage device for hydraulic cylinders in the aforementioned patented technology solves the leakage problem to some extent during use, the lack of support at the connection points after the external oil pipes are connected to the inlet and outlet oil pipes makes the connection unreliable. As the hydraulic cylinder is an actuator, the pressure of the oil in and out during its operation will inevitably cause the oil pipes to shake. When the oil pipes shake, the connection points are prone to loosening, which can easily lead to leakage. Therefore, its practicality is insufficient. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a leak-proof device for hydraulic cylinders that makes the connection between the external oil pipe and the inlet and outlet oil pipes more secure, effectively avoids loosening of the connection when the oil pipe shakes, prevents leakage at the oil pipe connection, and improves practicality.

[0006] Technical solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a leak-proof device for a hydraulic cylinder, comprising a cylinder barrel, a piston rod movably connected inside the cylinder barrel, a cylinder head fixedly connected to the top of the cylinder barrel, the cylinder head being fitted onto the piston rod, an oil inlet pipe and an oil outlet pipe fixedly connected to the outside of the cylinder barrel, and mounting plates installed on both the oil inlet pipe and the oil outlet pipe; a set of support components fixedly provided on the outer wall of the cylinder barrel at the positions of the oil inlet pipe and the oil outlet pipe, the support components including a fixing frame and a locking sleeve, for fixing... The frame is fixedly sleeved on the outer wall of the cylinder. A collar is fixedly connected to the front end of the frame, and a clamping ring is fixedly connected to the front end of the collar. The inner diameter of the clamping ring is the same as the inner diameter of the collar, and the outer diameter of the clamping ring is smaller than the outer diameter of the collar. The outer wall of the clamping ring is provided with external threads, and four sets of clearance grooves are equally spaced on the clamping ring. The inner wall of the locking sleeve is provided with internal threads. The locking sleeve is screwed onto the clamping ring through the mating of the internal and external threads. The outer edge of the clamping ring and the inner and outer edges of the locking sleeve are both designed as elliptical surfaces.

[0008] Preferably, four sets of anti-slip rubber pads are fixedly connected in an annular pattern at equal intervals on the inner wall of the clamping ring.

[0009] Preferably, a protective rubber ring is fixedly connected to the inner wall of the front side of the locking sleeve.

[0010] Preferably, a fastening washer is fixedly connected to the front end of the collar, and the fastening washer is fitted onto the clamping ring.

[0011] Preferably, the outer wall of the locking sleeve is provided with multiple sets of anti-slip grooves arranged in annularly at equal intervals.

[0012] Preferably, the inner side of the fixing frame and the outer wall of the cylinder are fixedly connected by three sets of reinforcing plates at equal intervals in a ring.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: During use, the inlet and outlet oil pipes are coaxial with the collar, and the inner diameter of the collar is slightly larger than the outer diameter of the outer oil pipe, allowing the oil pipe to pass through the collar. Initially, the locking sleeve is tightened onto the clamping ring. Under the action of the elliptical surface, the clamping ring is in a tight clamping state. When connecting the outer oil pipe to the inlet and outlet oil pipes, first, by turning the locking sleeve counterclockwise, the locking sleeve is moved forward a short distance without disengaging from the clamping ring, thereby loosening the clamping ring. Then, the outer... The oil pipe passes through the locking sleeve and clamping ring and connects to the inlet and outlet oil pipes. After connection, the locking sleeve is tightened by turning it clockwise, which in turn tightens the clamping ring. The clamping ring is then clamped onto the external oil pipe. The clamping ring and locking sleeve provide support for the external oil pipe near the connection point. This clamping support makes the connection between the external oil pipe and the inlet and outlet oil pipes more secure, effectively preventing loosening of the connection point when the oil pipe shakes, preventing leakage at the oil pipe connection point, and improving practicality. Attached Figure Description

[0014] Figure 1This is a schematic diagram of the isometric structure of this utility model;

[0015] Figure 2 This is an isometric structural diagram of the support component in this utility model;

[0016] Figure 3 This is an isometric structural diagram of the support component after the locking sleeve is unscrewed in this utility model;

[0017] Figure 4 This is an isometric structural diagram of the locking sleeve in this utility model;

[0018] Figure 5 This is a schematic diagram of the isometric cross-sectional structure of the locking sleeve in this utility model;

[0019] The following are labels in the attached diagram: 1. Cylinder barrel; 2. Piston rod; 3. Cylinder head; 4. Oil inlet pipe; 5. Oil outlet pipe; 6. Mounting plate; 7. Fixing bracket; 8. Collar; 9. Clamping ring; 10. External thread; 11. Clearance groove; 12. Locking sleeve; 13. Internal thread; 14. Anti-slip pad; 15. Protective rubber ring; 16. Fastening washer; 17. Anti-slip groove; 18. Reinforcing plate. Detailed Implementation

[0020] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0021] Example 1

[0022] Please see Figures 1-5This utility model discloses a leak-proof device for a hydraulic cylinder, comprising a cylinder barrel 1, a piston rod 2 movably connected inside the cylinder barrel 1, a cylinder head 3 fixedly connected to the top of the cylinder barrel 1, the cylinder head 3 being fitted onto the piston rod 2, an oil inlet pipe 4 and an oil outlet pipe 5 fixedly connected to the outside of the cylinder barrel 1, and mounting plates 6 installed on both the oil inlet pipe 4 and the oil outlet pipe 5. A set of support components is fixedly installed on the outer wall of the cylinder barrel 1 at the positions of the oil inlet pipe 4 and the oil outlet pipe 5, respectively. The support components include a fixing frame 7 and a locking sleeve 12, the fixing frame 7 being fixedly fitted onto the outside of the cylinder barrel 1. On the wall, a collar 8 is fixedly connected to the front end of the fixing bracket 7, and a clamping ring 9 is fixedly connected to the front end of the collar 8. The inner diameter of the clamping ring 9 is the same as the inner diameter of the collar 8, and the outer diameter of the clamping ring 9 is smaller than the outer diameter of the collar 8. The outer wall of the clamping ring 9 is provided with an external thread 10, and four sets of clearance grooves 11 are equally spaced on the clamping ring 9. The inner wall of the locking sleeve 12 is provided with an internal thread 13. The locking sleeve 12 is screwed onto the clamping ring 9 through the mating of the internal thread 13 and the external thread 10. The outer edge of the clamping ring 9 and the inner and outer edges of the locking sleeve 12 are both elliptical. The structure features a circular surface. During use, the inlet pipe 4 and outlet pipe 5 are coaxial with the collar 8, and the inner diameter of the collar 8 is slightly larger than the outer diameter of the external oil pipe, allowing the oil pipe to pass through the collar 8. Initially, the locking sleeve 12 is tightened onto the clamping ring 9. Under the action of the elliptical surface, the clamping ring 9 is in a tightened clamping state. When connecting the external oil pipe to the inlet pipe 4 and outlet pipe 5, first, by turning the locking sleeve 12 counterclockwise, the locking sleeve 12 is moved forward a short distance without disengaging from the clamping ring 9, thus loosening the clamping ring 9. Then, the external oil pipe is removed from the locking sleeve. The locking sleeve 12 passes through the clamping ring 9 and connects to the inlet pipe 4 and the outlet pipe 5. After the connection is made, the locking sleeve 12 is tightened by turning it clockwise, which tightens the clamping ring 9. After the clamping ring 9 is tightened, it is clamped on the external oil pipe. The clamping ring 9 and the locking sleeve 12 support the position of the external oil pipe near the connection. Through clamping and support, the connection between the external oil pipe and the inlet and outlet pipes is more secure, which effectively prevents the connection from loosening when the oil pipe shakes, prevents leakage at the oil pipe connection, and improves practicality.

[0023] Example 2

[0024] Please see Figures 1-5This utility model discloses a leak-proof device for a hydraulic cylinder, comprising a cylinder barrel 1, a piston rod 2 movably connected inside the cylinder barrel 1, a cylinder head 3 fixedly connected to the top of the cylinder barrel 1, the cylinder head 3 being fitted onto the piston rod 2, an oil inlet pipe 4 and an oil outlet pipe 5 fixedly connected to the outside of the cylinder barrel 1, and mounting plates 6 installed on both the oil inlet pipe 4 and the oil outlet pipe 5. A set of support components is fixedly installed on the outer wall of the cylinder barrel 1 at the positions of the oil inlet pipe 4 and the oil outlet pipe 5, respectively. The support components include a fixing frame 7 and a locking sleeve 12. The fixing frame 7 is fixedly fitted onto the outer wall of the cylinder barrel 1. A collar 8 is fixedly connected to the front end of the 7th ring, and a clamping ring 9 is fixedly connected to the front end of the collar 8. The inner diameter of the clamping ring 9 is the same as that of the collar 8, and the outer diameter of the clamping ring 9 is smaller than that of the collar 8. The outer wall of the clamping ring 9 is provided with an external thread 10. Four sets of clearance grooves 11 are equally spaced on the clamping ring 9. Four sets of anti-slip rubber pads 14 are fixedly connected annularly at equal intervals on the inner wall of the clamping ring 9. The inner wall of the locking sleeve 12 is provided with an internal thread 13. The locking sleeve 12 is screwed onto the clamping ring 9 through the mating of the internal thread 13 and the external thread 10. The outer edge of the clamping ring 9 and the locking sleeve 12 are also connected. The inner and outer sides of the front edge of sleeve 12 are both designed with an elliptical surface structure. In use, the inlet pipe 4 and outlet pipe 5 are coaxial with the collar 8, and the inner diameter of the collar 8 is slightly larger than the outer diameter of the outer oil pipe, allowing the oil pipe to pass through the collar 8. Initially, the locking sleeve 12 is tightened onto the clamping ring 9. Under the action of the elliptical surface, the clamping ring 9 is in a tightened clamping state. When connecting the outer oil pipe to the inlet pipe 4 and outlet pipe 5, first, by turning the locking sleeve 12 counterclockwise, the locking sleeve 12 is moved forward a short distance without disengaging from the clamping ring 9, thus loosening the clamping ring 9. Then, the outer... The oil pipe passes through the locking sleeve 12 and the clamping ring 9 and connects to the inlet pipe 4 and the outlet pipe 5. After the connection is made, the locking sleeve 12 is tightened by turning it clockwise, which tightens the clamping ring 9. After the clamping ring 9 is tightened, it is clamped to the external oil pipe. The clamping ring 9 and the locking sleeve 12 support the position of the external oil pipe near the connection. Through clamping and support, the connection between the external oil pipe and the inlet and outlet pipes is more secure, effectively preventing the connection from loosening when the oil pipe shakes, preventing leakage at the oil pipe connection, and improving practicality.

[0025] The clamping ring 9 has four sets of anti-slip rubber pads 14 fixedly connected in an annular pattern at equal intervals on its inner wall; by setting the anti-slip rubber pads 14, the clamping ring 9 can clamp the external oil pipe more tightly and reliably.

[0026] A protective rubber ring 15 is fixedly connected to the inner wall of the front side of the locking sleeve 12; by setting the protective rubber ring 15, the external oil pipe can be protected and wear on the outer wall of the oil pipe can be prevented.

[0027] The front end of the collar 8 is fixedly connected to a fastening washer 16, and the fastening washer 16 is fitted onto the clamping ring 9. By setting the fastening washer 16, when the locking sleeve 12 is tightened, the rear end of the locking sleeve 12 is tightly pressed against the fastening washer 16, making the locking sleeve 12 tighten more securely.

[0028] The outer wall of the locking sleeve 12 is provided with multiple sets of anti-slip grooves 17 at equal intervals in a ring; by setting the anti-slip grooves 17, the locking sleeve 12 can prevent the hand from slipping when it is turned.

[0029] Three sets of reinforcing plates 18 are fixedly connected in an annular pattern between the inner side of the fixing frame 7 and the outer wall of the cylinder 1; by setting the reinforcing plates 18, the connection between the fixing frame 7 and the cylinder 1 can be made more firm and stable.

[0030] This utility model discloses a leak-proof device for hydraulic cylinders. In operation, the inlet pipe 4 and outlet pipe 5 are coaxial with the collar 8, which surrounds the front of the inlet pipe 4 and outlet pipe 5. The inner diameter of the collar 8 is slightly larger than the outer diameter of the outer oil pipe, allowing the oil pipe to pass through. Initially, the locking sleeve 12 is tightened onto the clamping ring 9. Under the action of the elliptical surface, the clamping ring 9 is in a tightened clamping state. When connecting the outer oil pipe to the inlet pipe 4 and outlet pipe 5, the locking sleeve 12 is first rotated counterclockwise to move it forward slightly without disengaging it from the clamping ring 9, thus loosening the clamping ring 9. Then, the outer oil pipe passes through the locking sleeve 12 and the clamping ring 9 and connects to the inlet pipe 4 and outlet pipe 5. After connecting the pipe 5, tighten the locking sleeve 12 by turning it clockwise to tighten the clamping ring 9. After the clamping ring 9 is tightened, it is clamped onto the external oil pipe. The clamping ring 9 and the locking sleeve 12 clamp and support the external oil pipe near the connection point to ensure a reliable connection between the external oil pipe and the inlet and outlet oil pipes. The cylinder 1, piston rod 2, cylinder head 3, inlet pipe 4, outlet pipe 5 and mounting plate 6 in this utility model are all referenced from a hydraulic cylinder anti-leakage device with announcement number CN219452573U, which belongs to the disclosed prior art. The other specific structural components and working principles have been described in detail in the disclosed patent, so they will not be elaborated here.

[0031] The present invention relates to a leak-proof device for hydraulic cylinders. Its installation method, connection method, or setting method are all common mechanical methods. As long as it can achieve its beneficial effect, it can be implemented.

[0032] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A leak-proof device for a hydraulic cylinder, comprising a cylinder barrel (1), a piston rod (2) movably connected inside the cylinder barrel (1), a cylinder head (3) fixedly connected to the top of the cylinder barrel (1), the cylinder head (3) being fitted onto the piston rod (2), an oil inlet pipe (4) and an oil outlet pipe (5) fixedly connected to the outside of the cylinder barrel (1), and mounting plates (6) installed on both the oil inlet pipe (4) and the oil outlet pipe (5), characterized in that, A set of support components is fixedly provided on the outer wall of the cylinder (1) at the positions of the oil inlet pipe (4) and the oil outlet pipe (5); The support assembly includes a fixed frame (7) and a locking sleeve (12). The fixed frame (7) is fixedly sleeved on the outer wall of the cylinder (1). A collar (8) is fixedly connected to the front end of the fixed frame (7). A clamping ring (9) is fixedly connected to the front end of the collar (8). The inner diameter of the clamping ring (9) is the same as the inner diameter of the collar (8). The outer diameter of the clamping ring (9) is smaller than the outer diameter of the collar (8). An external thread (10) is provided on the outer wall of the clamping ring (9). Four sets of clearance grooves (11) are equally spaced on the clamping ring (9). An internal thread (13) is provided on the inner wall of the locking sleeve (12). The locking sleeve (12) is screwed onto the clamping ring (9) through the cooperation of the internal thread (13) and the external thread (10). The outer side of the front edge of the clamping ring (9) and the inner and outer sides of the front edge of the locking sleeve (12) are both set as elliptical surfaces.

2. The anti-leakage device for a hydraulic cylinder as described in claim 1, characterized in that, The inner wall of the clamping ring (9) is fixedly connected with four sets of anti-slip rubber pads (14) at equal intervals.

3. The anti-leakage device for a hydraulic cylinder as described in claim 2, characterized in that, A protective rubber ring (15) is fixedly connected to the inner wall of the front side of the locking sleeve (12).

4. The anti-leakage device for a hydraulic cylinder as described in claim 3, characterized in that, The front end of the collar (8) is fixedly connected to a fastening washer (16), and the fastening washer (16) is fitted onto the clamping ring (9).

5. A leak-proof device for a hydraulic cylinder as described in claim 4, characterized in that, The locking sleeve (12) has multiple sets of anti-slip grooves (17) arranged in an annular pattern on its outer wall.

6. A leak-proof device for a hydraulic cylinder as described in claim 5, characterized in that, The inner side of the fixing frame (7) is fixedly connected to the outer wall of the cylinder (1) with three sets of reinforcing plates (18) at equal intervals in a ring.

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