Self-locking oil cylinder

Abstract

The utility model relates to the technical field of hydraulic oil cylinders, in particular to a self-locking oil cylinder which comprises a cylinder barrel and a piston rod located in the cylinder barrel, a guide sleeve is arranged at the open end of the cylinder barrel, the end, located in the cylinder barrel, of the piston rod is connected with a piston, and the end, away from the piston, of the piston rod is provided with threads and connected with a locking nut. The piston rod is sleeved with a limiting structure, and the limiting structure is located between the guide sleeve and the locking nut. The anti-corrosion oil cylinder is simple in structure and convenient to machine, thread self-locking is achieved through matching of the piston rod and the locking nut, then the piston rod is further locked through the limiting structure, the oil cylinder works in a completely-sealed state under the double action, and the anti-corrosion capacity of the oil cylinder is greatly improved; due to the detachable limiting structure, the installation space of the oil cylinder is reduced, more application occasions are met, and larger output force can be provided.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic cylinders, in particular to a self-locking cylinder. Background Art

[0002] As Figure 1 shown, there is a prior art threaded self-locking cylinder. This cylinder needs to use a small cylinder 10 inside the piston rod to achieve reciprocating motion of the cylinder. The structure is complex, the processing technology requirements are high, the cost of the cylinder is high, and there is an annular cavity 11 communicating with the atmosphere between the self-locking thread and the piston. Rainwater and impurities can corrode and damage the inner hole of the cylinder and the large piston through the annular cavity 11, increasing the anti-corrosion difficulty of the cylinder.

[0003] As Figure 2 shown, there is another prior art threaded self-locking cylinder structure. This structure achieves threaded self-locking by installing a fixed support plate 12. The cylinder requires sufficient installation space, and for some mechanisms with limited space, this cylinder cannot meet the usage requirements. Summary of the Invention

[0004] The technical problem to be solved by the utility model is: to provide a self-locking cylinder in order to solve the problems of poor locking performance and low efficiency of existing cylinders.

[0005] The technical solution adopted by the utility model to solve its technical problems is: a self-locking cylinder, including a cylinder barrel and a piston rod located inside the cylinder barrel. A guide sleeve is arranged at the open end of the cylinder barrel. One end of the piston rod located inside the cylinder barrel is connected to a piston, and the other end of the piston rod is provided with a thread and connected to a locking nut. A limiting structure is sleeved on the piston rod, and the limiting structure is located between the guide sleeve and the locking nut.

[0006] Further, the limiting structure includes a plurality of limiting rings, and the limiting rings are sequentially abutted along the axial direction of the piston rod.

[0007] Furthermore, the limiting ring is formed by at least two split rings connected end to end.

[0008] Furthermore, the limiting ring includes a first split ring and a second split ring, and the two ends of the first split ring and the second split ring are detachably connected.

[0009] Furthermore, one side of each limiting ring is provided with a convex platform, and the other side is provided with a groove. The convex platform of any one limiting ring cooperates with the groove of the adjacent limiting ring. Through the cooperation of the convex platform and the groove, the reliable connection of adjacent limiting rings is ensured, and the locking of the cylinder at any position is realized.

[0010] Furthermore, the two ends of the first split ring and the second split ring are detachably connected by limiting screws.

[0011] Furthermore, rubber pads are connected to the inner walls of the first split ring and the second split ring. With such an arrangement, the oil cylinder can achieve a completely sealed state, greatly improving the anti-corrosion ability of the oil cylinder.

[0012] Furthermore, a notch adapted to the convex platform of the limit ring is formed on the inner wall of the guide sleeve close to the limit structure. With such an arrangement, one side of the limit ring is connected to the guide sleeve, ensuring a more reliable connection of the limit ring.

[0013] Further, sealing rings are provided between the guide sleeve and the cylinder barrel, and between the guide sleeve and the piston rod.

[0014] Further, one end of the piston rod extending out of the cylinder barrel protrudes outward to form a connecting portion, and a connecting head is connected to the outside of the connecting portion.

[0015] The beneficial effects of the present utility model: The structure of the present utility model is simple and convenient to process. First, the piston rod and the locking nut are cooperated to achieve thread self-locking, and then the piston rod is further locked by the limit structure. Under the dual action, the oil cylinder works in a completely sealed state, greatly improving the anti-corrosion ability of the oil cylinder; the detachable limit structure reduces the installation space of the oil cylinder, meets more application occasions, and can provide a greater output force. Multiple limit rings are stacked to achieve locking at any position. Description of the Drawings

[0016] The present utility model will be further described below with reference to the drawings and embodiments.

[0017] Figure 1 is a schematic structural diagram of an oil cylinder with thread self-locking in the prior art.

[0018] Figure 2 is a schematic structural diagram of another oil cylinder with thread self-locking in the prior art.

[0019] Figure 3 is a schematic structural diagram of the present utility model.

[0020] Figure 4 is Figure 3 a cross-sectional view.

[0021] Figure 5 is Figure 4 an enlarged schematic structural diagram at I in

[0022] Figure 6 is a schematic structural diagram of the limit ring in the present utility model.

[0023] Figure 7 is Figure 5 a side view.

[0024] In the figure: 1. cylinder barrel, 2. piston rod, 21. connecting part, 3. guide sleeve, 31. notch, 4. piston, 5. locking nut, 6. limiting ring, 6a. first split ring, 6b. second split ring, 61. boss, 62. groove, 63. rubber pad, 7. connector, 8. limiting screw, 10. small oil cylinder, 11. annular cavity, 12. fixed support plate. Detailed implementation mode

[0025] Now, the present utility model will be further described in detail with reference to the accompanying drawings. These drawings are all simplified schematic diagrams, only showing the basic structure of the present utility model in a schematic manner, so they only show the components related to the present utility model.

[0026] As Figure 3 and Figure 4 shown, a self-locking oil cylinder includes a cylinder barrel 1 and a piston rod 2 located inside the cylinder barrel 1. A guide sleeve 3 is provided at the open end of the cylinder barrel 1. One end of the piston rod 2 located inside the cylinder barrel 1 is connected to a piston 4. The end of the piston rod 2 far from the piston 4 is provided with a thread and connected with a locking nut 5. A limiting structure is sleeved on the piston rod 2, and the limiting structure is located between the guide sleeve 3 and the locking nut 5. Specifically: the limiting structure includes a plurality of limiting rings 6, and the limiting rings 6 are sequentially abutted along the axial direction of the piston rod 2. The limiting ring 6 is formed by at least two split rings connected end to end.

[0027] As Figure 5 shown, a boss 61 is provided on one side of each limiting ring 6, and a groove 62 is provided on the other side thereof. The boss 61 of any limiting ring 6 is matched with the groove 62 of the adjacent limiting ring 6. A notch 31 adapted to the boss 61 of the limiting ring 6 is formed on the inner wall of the guide sleeve 3 close to the through hole.

[0028] Among them, the piston rod 2 is a solid cylindrical rod and can bear a greater load. An external thread is provided on the outer peripheral surface of one end of the piston rod 2 extending out of the cylinder barrel 1, and the locking nut 5 is threadedly connected with the piston rod 2. A connecting part 21 protrudes outward from one end of the piston rod 2 extending out of the cylinder barrel 1, and a connector 7 is connected to the outside of the connecting part 21. Sealing rings are provided between the guide sleeve 3 and the cylinder barrel 1 and between the guide sleeve 3 and the piston rod 2.

[0029] As Figure 6 and Figure 7As shown, the limit ring 6 includes a first split ring 6a and a second split ring 6b, and the two ends of the first split ring 6a and the second split ring 6b are detachably connected. Specifically: the two ends of the first split ring 6a and the second split ring 6b are detachably connected by limit screws 8. The first split ring 6a and the second split ring 6b have the same structure, and their intersecting surface is a plane. A first screw hole is provided on the outer circle near one end of the first split ring 6a, and a second screw hole is provided on the end surface where the second split ring 6b intersects with this end of the first split ring 6a. The limit screw 8 sequentially passes through the first screw hole and the second screw hole; a third screw hole is provided on the outer circle near one end of the second split ring 6b, and a fourth screw hole is provided on the end surface where the first split ring 6a intersects with this end of the second split ring 6b. The limit screw 8 sequentially passes through the third screw hole and the fourth screw hole. And a rubber pad 63 is connected to the inner walls of the first split ring 6a and the second split ring 6b.

[0030] Working principle: An external thread is provided on the outer peripheral surface at one end of the piston rod 2 extending out of the cylinder barrel 1, eliminating the need for long thread machining and greatly reducing the processing cost of the oil cylinder. The piston rod 2 and the locking nut 5 cooperate with each other to achieve thread self-locking. The detachable limit structure greatly reduces the installation space of the oil cylinder and meets more application scenarios. The limit ring has a first split ring 6a and a second split ring 6b. The first split ring 6a and the second split ring 6b are connected by limit screws 8, and a rubber pad 63 is connected to the inner walls of the first split ring 6a and the second split ring 6b. The oil cylinder operates in a completely sealed state, greatly improving the anti-corrosion ability of the oil cylinder. Multiple limit rings 6 can be stacked and used to lock at any position, and adjacent limit rings 6 are matched by a boss 61 and a groove 62 to ensure reliable connection. The simple double-acting oil cylinder can provide a greater output force. The piston rod 2 has a solid structure and can bear a greater load. The double-acting thread self-locking oil cylinder in this embodiment combines the oil cylinder and the limit structure, with a simple structure and convenient processing.

[0031] Taking the above ideal embodiments based on the present utility model as inspiration, through the above description, relevant staff can completely make various changes and modifications within the scope not deviating from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A self-locking oil cylinder, comprising a cylinder barrel (1) and a piston rod (2) located within the cylinder barrel (1), characterized in that: A guide sleeve (3) is provided at the open end of the cylinder barrel (1). One end of the piston rod (2) located inside the cylinder barrel (1) is connected to a piston (4). The end of the piston rod (2) away from the piston (4) is provided with a thread and connected with a locking nut (5). A limiting structure is sleeved on the piston rod (2), and the limiting structure is located between the guide sleeve (3) and the locking nut (5).

2. The self-locking oil cylinder according to claim 1, wherein: The limiting structure includes a number of limiting rings (6), and the limiting rings (6) are sequentially abutted along the axial direction of the piston rod (2).

3. The self-locking oil cylinder according to claim 2, wherein: The limiting ring (6) is formed by connecting at least two split rings end to end.

4. The self-locking oil cylinder according to claim 3, characterized in that: The limiting ring (6) includes a first split ring (6a) and a second split ring (6b), and the two ends of the first split ring (6a) and the second split ring (6b) are detachably connected.

5. The self-locking oil cylinder according to claim 4, characterized in that: A boss (61) is provided on one side of each limiting ring (6), and a groove (62) is provided on the other side. The boss (61) of any one limiting ring (6) is matched with the groove (62) of the adjacent limiting ring (6).

6. The self-locking oil cylinder according to claim 4, characterized in that: The two ends of the first split ring (6a) and the second split ring (6b) are detachably connected by a limiting screw (8).

7. The self-locking oil cylinder according to claim 6, wherein: A rubber pad (63) is connected to the inner walls of the first split ring (6a) and the second split ring (6b).

8. The self-locking oil cylinder according to claim 5, wherein: A notch (31) adapted to the boss (61) of the limiting ring (6) is formed on the inner wall of the guide sleeve (3) close to the limiting structure.

9. The self-locking oil cylinder according to claim 1, wherein: Sealing rings are provided between the guide sleeve (3) and the cylinder barrel (1), and between the guide sleeve (3) and the piston rod (2).

10. The self-locking oil cylinder according to claim 1, wherein: One end of the piston rod (2) extending out of the cylinder barrel (1) protrudes outward to form a connecting portion (21), and a connector (7) is connected to the outside of the connecting portion (21).

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