Self-locking oil cylinder

Abstract

The self-locking oil cylinder comprises a cylindrical main cylinder body and a pressing plate, the cylindrical main cylinder body comprises a cylinder and a circular concave cavity, a guide hole is formed in the middle of the pressing plate, a guide sleeve is arranged in the guide hole, a piston rod is arranged in the guide sleeve, and a hydraulic self-locking piston and a self-locking device check ring are arranged at the rear end of the piston rod. A first annular groove and a mechanical self-locking device are arranged at the front end of the inner wall of the circular concave cavity, a first chamfer angle is arranged at the joint of the rear end face of a check ring of the self-locking device and the outer surface of the self-locking device, and the front end of the mechanical self-locking device makes contact with the inclined face of the first chamfer angle. And the oil outlet hole is communicated with the first annular groove. According to the hydraulic self-locking oil cylinder, the cylindrical main cylinder body is arranged to be in an integrated shape, so that the structure is simple, hydraulic oil can only flow in one direction and cannot flow back through matching of the self-locking device check ring and the hydraulic self-locking piston with the mechanical self-locking device, and the normal working and using effects of the oil cylinder are guaranteed.

Description

Technical Field

[0001] The utility model relates to the field of die-casting die accessories, in particular to a self-locking oil cylinder. Background Art

[0002] The oil cylinder is also a hydraulic cylinder. Oil cylinders are often used on die-casting molds to control the opening and closing of die-casting molds. During the operation of the die-casting machine, hydraulic oil is pressed into the oil cylinder to move the piston of the oil cylinder, thereby driving the opening and closing of the die-casting mold. By controlling the flow of hydraulic oil in the oil cylinder, the opening and closing speed and position of the die-casting mold can be accurately controlled. In the die-casting process, the role of the die-casting mold oil cylinder is very important. It can not only ensure the opening and closing action of the die-casting mold, but also realize automatic exhaust, automatic adjustment of mold temperature and control of casting quality during the die-casting process. Therefore, in the operation of the die-casting machine, the die-casting mold oil cylinder is an indispensable component.

[0003] However, the existing oil cylinder has a complex structure and is prone to oil backflow, which will affect the use effect of the oil cylinder.

[0004] Therefore, improvements must be made to address the above-mentioned defects. Utility Model Content

[0005] The purpose of the utility model is to solve at least part of the above existing problems and bring corresponding beneficial effects.

[0006] In order to solve the above technical problems, the utility model provides a self-locking oil cylinder, comprising a cylindrical main cylinder body and a pressure plate arranged in front of the cylindrical main cylinder body, the cylindrical main cylinder body comprising a cylinder, a circular concave cavity is arranged on the front end surface of the cylinder, a guide hole is arranged in the middle of the pressure plate, a guide sleeve is arranged in the guide hole, a piston rod is arranged in the guide sleeve, the rear end of the guide sleeve is arranged in the circular concave cavity, a hydraulic self-locking piston is arranged at the rear end of the piston rod, a self-locking device retaining ring is arranged on the piston rod at the front side of the hydraulic self-locking piston, a first annular groove is arranged at the front end of the inner wall of the circular concave cavity, a mechanical self-locking device is arranged in the first annular groove, a first chamfered right angle is arranged at the connection between the rear end surface of the self-locking device retaining ring and the outer surface of the self-locking device, the front end of the mechanical self-locking device contacts the inclined surface of the first chamfered right angle, an oil inlet hole is arranged at the rear end of the surface of the cylindrical main cylinder body, an oil outlet hole is arranged at the front end of the surface of the cylindrical main cylinder body, the oil inlet hole is communicated with the rear end of the circular concave cavity, and the oil outlet hole is communicated with the first annular groove.

[0007] Furthermore, the mechanical self-locking device is a circular ring, and the circular ring includes two elastic semicircular rings.

[0008] Furthermore, an anti-collision piston is provided on the piston rod at the rear side of the hydraulic self-locking piston.

[0009] Furthermore, a second chamfered right angle is provided at the connection between the front end surface of the hydraulic self-locking piston and the outer surface of the hydraulic self-locking piston.

[0010] Furthermore, a third chamfered right angle corresponding to the first chamfered right angle is provided at the front end of the semicircular ring, and a fourth chamfered right angle corresponding to the second chamfered right angle is provided at the rear end of the semicircular ring.

[0011] Furthermore, a cooling system liquid inlet hole is provided on the pressing plate.

[0012] Furthermore, a second annular groove is provided at the front end of the first annular groove for engaging with the rear end of the guide sleeve.

[0013] Beneficial effects:

[0014] The utility model has the following innovative advantages:

[0015] The utility model sets the cylindrical main cylinder body in an integrated shape, which has a simple structure. Through the self-locking device retaining ring, the hydraulic self-locking piston and the mechanical self-locking device, the hydraulic oil can only flow in one direction and cannot flow back, thereby ensuring the normal operation and use effect of the oil cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the plane structure of the utility model.

[0017] In the figure: 1. Cylinder; 2. Pressure plate; 3. Piston rod; 4. Guide sleeve; 5. Cooling system liquid inlet hole; 6. Self-locking device retaining ring; 7. Oil outlet hole; 8. First annular groove; 9. Mechanical self-locking device; 10. Hydraulic self-locking piston; 11. Anti-collision piston; 12. Oil inlet hole; 13. Circular concave cavity; 14. Oil passage hole. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the technical solution of the present disclosure clearer, the technical solution of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings of specific embodiments of the present disclosure.

[0019] The same reference numerals in the drawings represent the same components. It should be noted that the described embodiments are only part of the embodiments of the present disclosure, but not all of the embodiments.

[0020] Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present disclosure.

[0021] like Figure 1As shown, the utility model provides a self-locking oil cylinder, including a cylindrical main cylinder body and a pressure plate 2 arranged in front of the cylindrical main cylinder body, the cylindrical main cylinder body includes a cylinder 1, a circular concave cavity 13 is arranged on the front end surface of the cylinder 1, a guide hole is arranged in the middle of the pressure plate 2, a guide sleeve 4 is arranged in the guide hole, a piston rod 3 is arranged in the guide sleeve 4, the rear end of the guide sleeve 4 is arranged in the circular concave cavity 13, a hydraulic self-locking piston 10 is arranged at the rear end of the piston rod 3, and a self-locking device retaining ring is arranged on the piston rod 3 in front of the hydraulic self-locking piston 10 6. A first annular groove 8 is provided at the front end of the inner wall of the circular concave cavity 13, a mechanical self-locking device 9 is provided in the first annular groove 8, a first chamfered right angle is provided at the connection between the rear end face of the self-locking device retaining ring 6 and the outer surface of the self-locking device 6, the front end of the mechanical self-locking device 9 contacts the inclined surface of the first chamfered right angle, an oil inlet hole 12 is provided at the rear end of the cylindrical main cylinder body surface, an oil outlet hole 7 is provided at the front end of the cylindrical main cylinder body surface, the oil inlet hole 12 is communicated with the rear end of the circular concave cavity 13, and the oil outlet hole 7 is communicated with the first annular groove 8.

[0022] The technical solution is to set the cylindrical main cylinder body into an integral shape, so that the structure is simple, and the self-locking device retaining ring 6, the hydraulic self-locking piston 10 and the mechanical self-locking device 9 can achieve that the hydraulic oil can only flow in one direction and cannot flow back, thereby ensuring the normal operation and use effect of the cylinder.

[0023] Both the hydraulic self-locking piston 10 and the anti-collision piston 9 are provided with oil passage holes 14 communicating front and rear, so as to facilitate the hydraulic oil to flow from the rear end to the front end in the circular concave cavity 13 .

[0024] During operation, the oil inlet hole 12 is connected to the oil inlet nozzle, and the oil outlet hole 7 is connected to the oil outlet nozzle. The hydraulic oil enters the rear end of the circular concave cavity 13 from the oil inlet hole 12, and then the piston rod 3 drives the hydraulic self-locking piston 10 to move backward so that the hydraulic oil flows from the rear end of the circular concave cavity 13 to the front end, and then is discharged through the oil outlet hole 7.

[0025] For example, in some embodiments, the mechanical self-locking device 9 is a circular ring, which includes two elastic semicircular rings. When the piston rod 3 drives the self-locking device retaining ring 6 to move backward, the two semicircular rings are squeezed by the self-locking device retaining ring and will automatically open. After opening, there will be a gap between the two semicircular rings, and the hydraulic oil at the rear end of the circular concave cavity 13 will enter the oil outlet 7 through the gap and be discharged. When the piston rod 3 moves forward, the two semicircular rings will automatically rebound and shrink to their original positions under the action of elasticity to prevent the hydraulic oil from flowing back.

[0026] For example, in some embodiments, an anti-collision piston 14 is provided on the piston rod 3 at the rear side of the hydraulic self-locking piston 10. The anti-collision piston 14 can further protect the hydraulic self-locking piston 10 and prevent the hydraulic self-locking piston 10 from being easily deformed or damaged.

[0027] For example, in some embodiments, a second chamfer is provided at the connection between the front end face of the hydraulic self-locking piston 10 and the outer surface of the hydraulic self-locking piston 10. A third chamfer corresponding to the first chamfer is provided at the front end of the semicircular ring, and a fourth chamfer corresponding to the second chamfer is provided at the rear end of the semicircular ring. This facilitates the two semicircular rings to be automatically opened and subsequently reset when squeezed by the retaining ring 6 of the self-locking device.

[0028] For example, in some embodiments, the pressure plate 2 is provided with a cooling system liquid inlet 5. In this way, the device can be cooled by an external coolant, and the cooling pipeline provided on the entire structure is of current design and will not be described in detail here.

[0029] For example, in some embodiments, the front end of the first annular groove 9 is provided with a second annular groove that cooperates with the rear end of the guide sleeve 4. The second annular groove is used to fix the guide sleeve 4 to prevent the piston rod 3 from taking away the guide sleeve 4 when moving backward.

[0030] To sum up, the utility model sets the cylindrical main cylinder body into an integrated shape, which has a simple structure. Through the self-locking device retaining ring, the hydraulic self-locking piston and the mechanical self-locking device, the hydraulic oil can only flow in one direction and cannot flow back, thereby ensuring the normal operation and use effect of the cylinder.

[0031] The words "first", "second" and similar words used in the specification and claims do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "an" or "the" do not indicate a quantitative limitation, but indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects.

[0032] "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the object being described changes, the relative position relationship may also change accordingly.

[0033] The above-mentioned preferred embodiments of the present invention are only and are not intended to limit the present invention. The protection scope of the present invention is defined by the accompanying claims. For ordinary technicians in this field, other embodiments can be obtained according to the drawings without creative work, and any changes based on the claims of the present invention are within the protection scope of the present invention.

Claims

1. A self-locking cylinder, characterized in that: The cam body has an angular channel formed between a central axis and a circle, the central axis being that of the piston rod and the centre of the circle being that of the piston rod.

2. A self-locking cylinder according to claim 1, characterized in that: The mechanical self-locking device is a circular ring, which includes two elastic semicircular rings.

3. A self-locking cylinder according to claim 2, characterized in that: An anti-collision piston is arranged on the piston rod at the rear side of the hydraulic self-locking piston.

4. A self-locking oil cylinder according to claim 3, characterized in that: A second chamfered right angle is provided at the connection between the front end surface of the hydraulic self-locking piston and the outer surface of the hydraulic self-locking piston.

5. A self-locking oil cylinder according to claim 4, characterized in that: The front end of the semicircular ring is provided with a third chamfered right angle corresponding to the first chamfered right angle, and the rear end of the semicircular ring is provided with a fourth chamfered right angle corresponding to the second chamfered right angle.

6. A self-locking oil cylinder according to claim 1, characterized in that: The pressing plate is provided with a cooling system liquid inlet hole.

7. The self-locking cylinder according to claim 1, characterized in that: The front end of the first annular groove is provided with a second annular groove which cooperates with the rear end of the guide sleeve.

Images