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] The invention belongs to the technical field of locking cylinders, and in particular relates to a low-friction locking cylinder. Background Art

[0002] With the continuous development of automation technology and the continuous rise of labor costs, mechanical equipment will inevitably develop in the direction of high speed, high efficiency and full automation. The realization of automation is inseparable from electric and pneumatic actuators, and the cylinder is the most common pneumatic actuator.

[0003] The piston rod of a traditional locking cylinder is prone to generate a small amount of friction with the inner wall of the locking cylinder during the reciprocating motion in the locking cylinder. The traditional way to reduce friction is to use an O-ring to reduce friction. The effect of reducing friction using this method is poor. At the same time, the O-ring is easily damaged, and the life of the O-ring will directly affect the service life of the locking cylinder. Summary of the Invention

[0004] The present invention overcomes the deficiencies 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-mentioned purpose, the technical solution adopted by the present invention is: a low-friction locking cylinder, comprising a cylinder body, a piston rod located in the cylinder body, and a locking piece sleeved on the piston rod; a trachea joint is provided on the cylinder body, and one end of the piston rod located in the cylinder body is a spherical structure, and the locking piece is located in the cylinder body. The locking piece includes a guide bearing, a locking piece and an unlocking piston arranged in sequence, the piston rod passes through the guide bearing, the guide bearing is connected to the locking piece by a spring, the locking piece cooperates with the unlocking piston, and the guide bearing and the unlocking piston are both in contact with the inner wall of the cylinder.

[0006] In a preferred embodiment of the present invention, an exhaust port is provided on the cylinder body, 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 provided in the cylinder body, and the cylinder piston is provided in the cylinder body, and the cylinder piston cooperates 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 body 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 shoe, a spherical steel ball, and a conical steel sleeve that fits the piston rod from the inside to the outside.

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

[0012] In a preferred embodiment of the present invention, there are three tracheal joints, one of which corresponds to the position of the spherical structure of the piston rod, another corresponds to the position of the guide bearing, and another corresponds to the position of the unlocking piston.

[0013] The present invention solves the defects existing in the background technology and has the following beneficial effects:

[0014] The present invention forms a low-friction locking cylinder under the cooperation of the cylinder body, piston rod and locking piece, which 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 due to air pressure, so that the piston rod does not directly contact the inner wall of the cylinder and the friction force experienced by the piston rod during movement can also be reduced. At the same time, the presence of the locking piece can put the cylinder in a locked state, which is convenient for use. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0019] In the figure: 1. Cylinder body; 2. Piston rod; 3. Air pipe joint; 4. Spherical structure; 5. Guide bearing; 6. Locking piece; 61. Brake pad; 62. Spherical steel ball; 63. Conical steel sleeve; 7. Unlocking piston; 8. Spring; 9. Exhaust port; 10. Cylinder piston. DETAILED DESCRIPTION

[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 that only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0021] like Figures 1 to 3As shown, a low-friction locking cylinder comprises a cylinder body 1, a piston rod 2 located in the cylinder body 1, and a locking member 6 sleeved on the piston rod 2; a trachea joint 3 is provided on the cylinder body 1, and one end of the piston rod 2 located in the cylinder body 1 is a spherical structure 4, the locking member 6 is located in the cylinder body 1, and the locking member 6 comprises a guide bearing 5, a 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 by a spring 8, the locking member 6 cooperates with the unlocking piston 7, and the guide bearing 5 and the unlocking piston 7 are both 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, so that the piston rod 2 can adjust its position by itself 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 the action of air pressure, and the gap between the outer ring of the cylinder piston 10 and the inner wall of the cylinder body 1 is 0~0.005mm, so the gas filled in the cylinder body 1 will be filled 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 in the initial state is compressed and has a certain tension. When the piston rod 2 continues to extend, the conical steel sleeve 63 of the locking piece 6 moves under the tension of the spring 8. Since the inner conical surface of the conical steel sleeve 63 contacts the spherical steel ball 62, the spherical steel ball 62 is forced to squeeze the brake shoe 61. The brake shoe 61 contacts the piston rod 2 under the force state, and relies on the friction force to lock the piston rod 2 to achieve the locking state of the cylinder. When the locking state of the cylinder needs to be released, the air pipe joint 3 corresponding to the position of the unlocking piston 7 is ventilated, and the air pressure pushes the unlocking piston 7 to compress the spring 8, driving the conical steel sleeve 63 to move, so that the locking piece 6 is completely 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 resetting process, the air pressure introduced into the cylinder body 1 can be discharged from the exhaust port 9 .

[0025] In this embodiment, a cylinder piston 10 is provided in 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 can enable 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 member 6 includes a brake shoe 61 , a spherical steel ball 62 , and a conical steel sleeve 63 that fits 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 joints 3, one air pipe joint 3 corresponds to the position of the spherical structure 4 of the piston rod 2, another air pipe joint 3 corresponds to the position of the guide bearing 5, and another air pipe joint 3 corresponds to the position of the unlocking piston 7.

[0031] In summary, the present invention forms a low-friction locking cylinder under the cooperation of the cylinder body 1, the piston rod 2 and the locking piece 6, which does not require the use of O-rings to reduce friction. During the movement of the piston rod 2, gas will be filled between the cylinder piston 10 and the inner wall of the cylinder body 1 due to air pressure, so that the piston rod 2 does not directly contact the inner wall of the cylinder body 1, which can also reduce the friction experienced by the piston rod 2 during movement. At the same time, the presence of the locking piece 6 can put the cylinder in a locked state, which is convenient for use.

[0032] The above description is based on the ideal embodiment of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical scope of this invention. The technical scope of this invention is not limited to the content of the specification and must be determined according to the scope of the claims.

Claims

1. A low friction locking cylinder, characterized in that: It comprises a cylinder body, a piston rod located in the cylinder body, and a locking piece 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 piece is located in the cylinder body, the locking piece assembly comprises a guide bearing, a locking piece and an unlocking piston arranged in sequence, the piston rod passes through the guide bearing, the guide bearing is connected to the locking piece by a spring, the locking piece cooperates with the unlocking piston, and the guide bearing and the unlocking piston are both in contact with the inner wall of the cylinder body; The cylinder body is provided with an exhaust port, and the exhaust port corresponds to the position of the locking member; A cylinder piston is provided in the cylinder body, and the cylinder piston cooperates with the spherical structure of the piston rod; The locking member includes a brake shoe, a spherical steel ball, and a conical steel sleeve that fit the piston rod from the inside out; One end of the spring is fixed to the guide bearing; the conical steel sleeve is connected to the guide bearing through the spring; When in use, the spring in the initial state is compressed and has a certain tension. When the piston rod continues to extend, the conical steel sleeve of the locking piece moves under the tension of the spring. Since the inner conical surface of the conical steel sleeve contacts the spherical steel ball, the spherical steel ball is forced to squeeze the brake pad. The brake pad contacts the piston rod under force and relies on friction to lock the piston rod, thereby realizing the locking state of the cylinder. When the locking state of the cylinder needs to be released, the air pipe joint corresponding to the position of the unlocking piston is ventilated, and the air pressure pushes the unlocking piston to compress the spring, driving the conical steel sleeve to move, so that all the locking pieces are reset and the locking state is released.

2. A low friction locking cylinder according to claim 1, characterized in that: The gap between the cylinder piston and the inner wall of the cylinder body is 0 to 0.005 mm.

3. A low friction locking cylinder according to claim 1, characterized in that: There are three tracheal joints, one of which corresponds to the position of the spherical structure of the piston rod, another of which corresponds to the position of the guide bearing, and another of which corresponds to the position of the unlocking piston.

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