A low-friction locking cylinder

Abstract

The present invention discloses a low-friction locking cylinder, comprising a cylinder body, a piston rod located in the cylinder body, and a locking member sleeved on the piston rod; the cylinder body is provided with an air pipe joint, one end of the piston rod located in the cylinder body is a spherical structure, the locking member is located in the cylinder body, the locking member comprises a guide bearing, a locking member and an unlocking piston arranged in sequence, the piston rod passes through the guide bearing, the guide bearing is connected to the locking member via a spring, the locking member cooperates with the unlocking piston, and the guide bearing and the unlocking piston are both in contact with the inner wall of the cylinder. The present invention does not require the use of O-rings to reduce friction. During the movement of the piston rod, gas will be filled between the cylinder piston and the inner wall of the cylinder, so that the piston rod does not directly contact the inner wall of the cylinder, and the friction experienced by the piston rod during movement can also be reduced. The presence of the locking assembly can put the cylinder in a locked state, making it easy to use.

Description

Technical Field

[0001] This invention belongs to the field of locking cylinder technology, and particularly relates to a low-friction locking cylinder. Background Technology

[0002] With the continuous development of automation technology and the rising cost of labor, mechanical equipment will inevitably develop towards high speed, high efficiency, and full automation. The realization of automation is inseparable from electric and pneumatic actuators, with cylinders being the most common pneumatic actuators.

[0003] In traditional locking cylinders, the piston rod reciprocates within the cylinder, which can generate a small amount of friction with the cylinder's inner wall. The traditional method to reduce friction is to use O-rings. However, this method is not very effective at reducing friction, and the O-rings are prone to damage. The lifespan of the O-rings directly affects the lifespan of the locking cylinder. Summary of the Invention

[0004] This invention overcomes the shortcomings of the prior art and provides a low-friction locking cylinder to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a low-friction locking cylinder, comprising a cylinder body, a piston rod located within the cylinder body, and a locking member sleeved on the piston rod; the cylinder body is provided with an air pipe connector, one end of the piston rod located within the cylinder body has a spherical structure, the locking member is located within the cylinder body, and the locking member comprises a guide bearing, a locking member, and an unlocking piston arranged sequentially, the piston rod passing through the guide bearing, the guide bearing being connected to the locking member via a spring, the locking member cooperating with the unlocking piston, and both the guide bearing and the unlocking piston being in contact with the inner wall of the cylinder body.

[0006] In a preferred embodiment of the present invention, the cylinder body is provided with an exhaust port, and the exhaust port corresponds to the position of the locking member.

[0007] In a preferred embodiment of the present invention, a cylinder piston is disposed in the cylinder body, and the cylinder piston is engaged with the spherical structure of the piston rod.

[0008] In a preferred embodiment of the present invention, the gap between the cylinder piston and the inner wall of the cylinder is 0 to 0.005 mm.

[0009] In a preferred embodiment of the present invention, one end of the spring is fixed to the guide bearing.

[0010] In a preferred embodiment of the present invention, the locking member includes a brake pad, a spherical steel ball, and a conical steel sleeve that fit against the piston rod from the inside out.

[0011] In a preferred embodiment of the present invention, the tapered steel sleeve is connected to the guide bearing by a spring.

[0012] In a preferred embodiment of the present invention, the number of air pipe connectors is three: one air pipe connector corresponds to the spherical structure of the piston rod, another air pipe connector corresponds to the guide bearing, and a third air pipe connector corresponds to the unlocking piston.

[0013] This invention addresses the shortcomings of the prior art and has the following beneficial effects:

[0014] This invention forms a low-friction locking cylinder through the combined action of the cylinder body, piston rod, and locking component. It eliminates the need for O-rings to reduce friction. During piston rod movement, gas fills the space between the piston and the inner wall of the cylinder due to air pressure, preventing direct contact between the piston rod and the inner wall of the cylinder and reducing the friction experienced by the piston rod during movement. At the same time, the presence of the locking component keeps the cylinder in a locked state, facilitating its use. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0016] Figure 1 This is a schematic diagram of the overall structure of a preferred embodiment of the present invention;

[0017] Figure 2 This is a cross-sectional view of a preferred embodiment of the present invention;

[0018] Figure 3 for Figure 2 Enlarged view of section A in the middle;

[0019] In the diagram: 1. Cylinder block; 2. Piston rod; 3. Air pipe connector; 4. Spherical structure; 5. Guide bearing; 6. Locking component; 61. Brake pad; 62. Spherical steel ball; 63. Conical steel sleeve; 7. Unlocking piston; 8. Spring; 9. Exhaust port; 10. Cylinder piston. Detailed Implementation

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention and therefore only show the components relevant to the present invention.

[0021] like Figures 1 to 3As shown, a low-friction locking cylinder includes a cylinder body 1, a piston rod 2 located inside the cylinder body 1, and a locking member 6 sleeved on the piston rod 2; the cylinder body 1 is provided with an air pipe connector 3, one end of the piston rod 2 located inside the cylinder body 1 is a spherical structure 4, the locking member 6 is located inside the cylinder body 1, and the locking member 6 includes a guide bearing 5, the locking member 6, and an unlocking piston 7 arranged in sequence, the piston rod 2 passes through the guide bearing 5, the guide bearing 5 is connected to the locking member 6 through a spring 8, the locking member 6 cooperates with the unlocking piston 7, and both the guide bearing 5 and the unlocking piston 7 are in contact with the inner wall of the cylinder body 1.

[0022] In this embodiment, the spherical structure 4 of the piston rod 2 cooperates with the cylinder piston 10, allowing the piston rod 2 to adjust its position during movement, ensuring that the piston rod 2 is always concentric with the cylinder body 1. At the same time, the cylinder piston 10 can drive the piston rod 2 to move under air pressure. The gap between the outer ring of the cylinder piston 10 and the inner wall of the cylinder body 1 is 0 to 0.005 mm. Therefore, the gas filled into the cylinder body 1 will fill the space between the cylinder piston 10 and the inner wall of the cylinder body 1, without affecting the movement of the piston rod 2.

[0023] In this embodiment, the spring 8 is compressed in the initial state and has a certain tension. When the piston rod 2 continues to extend, the conical steel sleeve 63 of the locking member 6 moves under the tension of the spring 8. Since the conical surface inside the conical steel sleeve 63 contacts the spherical steel ball 62, the spherical steel ball 62 is forced to squeeze the brake pad 61. The brake pad 61 contacts the piston rod 2 under the force and locks the piston rod 2 by friction, realizing the cylinder locking state. When it is necessary to release the cylinder locking state, the air pipe joint 3 corresponding to the position of the unlocking piston 7 is vented. The air pressure pushes the unlocking piston 7 to compress the spring 8, which drives the conical steel sleeve 63 to move, so that the locking member 6 is fully reset and the locking state is released.

[0024] Specifically, the cylinder body 1 is provided with an exhaust port 9, which corresponds to the position of the locking member 6. During the reset process, the air pressure entering the cylinder body 1 can be discharged from the exhaust port 9.

[0025] In this embodiment, a cylinder piston 10 is provided inside the cylinder body 1. The cylinder piston 10 cooperates with the spherical structure 4 of the piston rod 2. The presence of the cylinder piston 10 enables the piston rod 2 to remain concentric with the cylinder body 1 during movement.

[0026] Specifically, the gap between the cylinder piston 10 and the inner wall of the cylinder body 1 is 0 to 0.005 mm.

[0027] In this embodiment, one end of the spring 8 is fixed to the guide bearing 5, thereby ensuring that the spring 8 has tension in the initial state.

[0028] Specifically, the locking component 6 includes a brake pad 61, a spherical steel ball 62, and a conical steel sleeve 63 that fit against the piston rod 2 from the inside out.

[0029] Specifically, the tapered steel sleeve 63 is connected to the guide bearing 5 via the spring 8.

[0030] In this embodiment, there are three air pipe connectors 3. One air pipe connector 3 corresponds to the position of the ball structure 4 of the piston rod 2, another air pipe connector 3 corresponds to the position of the guide bearing 5, and the third air pipe connector 3 corresponds to the position of the unlocking piston 7.

[0031] In summary, the present invention, through the combined action of cylinder body 1, piston rod 2, and locking element 6, forms a low-friction locking cylinder. It eliminates the need for O-rings to reduce friction. During the movement of piston rod 2, gas fills the space between the piston 10 and the inner wall of cylinder body 1 due to air pressure, preventing direct contact between piston rod 2 and the inner wall of cylinder body 1, thus reducing friction during piston rod 2's movement. Simultaneously, the presence of locking element 6 ensures the cylinder is in a locked state, facilitating its use.

[0032] Based on the preferred embodiments of the present invention described above, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A low-friction locking cylinder, characterized in that, The device includes a cylinder body, a piston rod located inside the cylinder body, and a locking member sleeved on the piston rod. The cylinder body is equipped with an air pipe connector. One end of the piston rod located inside the cylinder body has a spherical structure. The locking member is located inside the cylinder body and includes a guide bearing, a locking member, and an unlocking piston arranged sequentially. The piston rod passes through the guide bearing, which is connected to the locking member via a spring. The locking member cooperates with the unlocking piston, and both the guide bearing and the unlocking piston are in contact with the inner wall of the cylinder body.

2. The low-friction locking cylinder according to claim 1, characterized in that, The cylinder body is provided with an exhaust port, and the exhaust port corresponds to the position of the locking member.

3. A low-friction locking cylinder according to claim 1, characterized in that, The cylinder body is provided with a cylinder piston, which is engaged with the spherical structure of the piston rod.

4. A low-friction locking cylinder according to claim 3, characterized in that, The gap between the cylinder piston and the inner wall of the cylinder is 0 to 0.005 mm.

5. A low-friction locking cylinder according to claim 1, characterized in that, One end of the spring is fixed to the guide bearing.

6. A low-friction locking cylinder according to claim 1, characterized in that, The locking components include brake pads, spherical steel balls, and conical steel sleeves that fit against the piston rod from the inside out.

7. A low-friction locking cylinder according to claim 6, characterized in that, The tapered steel sleeve is connected to the guide bearing via a spring.

8. A low-friction locking cylinder according to claim 1, characterized in that, The number of air pipe connectors is three: one air pipe connector corresponds to the spherical structure of the piston rod, another air pipe connector corresponds to the guide bearing, and the third air pipe connector corresponds to the unlocking piston.

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