Air cylinder with lock

Abstract

The utility model belongs to the technical field of air cylinders, and particularly relates to an air cylinder with a lock, which comprises a cylinder body, a front end cover, a rear end cover and a piston, a piston rod is assembled on one side of the piston, a lock mechanism is arranged on the front end cover or the rear end cover, and the lock mechanism is arranged on the front end cover and used for limiting the position of the stroke tail end when the piston rod extends out of the cylinder body. A locking mechanism is arranged on the rear end cover and used for limiting the position of the stroke head end when the piston rod retracts back to the cylinder body, a locking groove matched with the locking mechanism to complete locking of the piston rod is formed in the piston rod, the cylinder body can drive the locking mechanism to unlock to enable the piston rod to move after ventilation, and the locking mechanism comprises a cover plate and a movable cavity. A plunger locking block is movably arranged in the movable cavity, and one end of the plunger locking block extends into the cylinder body; by means of the design, an extra power source is not needed, the structure is simpler, energy is saved, manual operation can be achieved, labor cost is reduced, and the device is more suitable for long-term development of enterprises.

Description

Technical Field

[0001] The utility model belongs to the technical field of cylinders, and specifically relates to a locked cylinder. Background Technique

[0002] A locked cylinder is a pneumatic component integrating a cylinder and a locking mechanism, characterized by high stability, precise control, and wide adaptability. It is widely used in industrial automation, robots, fixtures and other fields to achieve functions such as fixing, positioning, or clamping of workpieces.

[0003] The existing locked cylinders mainly consist of the following parts: cylinder block, piston, piston rod, gas circuit, locking structure, etc. Its working principle is: compressed air drives the piston to move. When it reaches the preset position, the locking mechanism can fix the position of the piston, thereby preventing the displacement of the piston rod.

[0004] At present, the existing locked cylinders in the prior art have the following disadvantages: Most of the locking mechanisms in the existing locked cylinders are manually controlled or driven by connecting to an external power source, with a complex structure. Although the manually controlled locking mechanism has a relatively simple structure, it requires special manual operation, and the increase in labor costs is not conducive to the long-term development of enterprises. Therefore, a locked cylinder is proposed to solve the above problems. Content of the Utility Model

[0005] In order to make up for the deficiencies of the existing locked cylinders and solve the problems that most of the locking mechanisms in the existing locked cylinders are manually controlled or driven by connecting to an external power source, with a complex structure, and although the manually controlled locking mechanism has a relatively simple structure, it requires special manual operation, and the increase in labor costs is not conducive to the long-term development of enterprises, a locked cylinder is proposed.

[0006] The technical solution adopted by the utility model to solve its technical problems is: A locked cylinder of the utility model includes a cylinder block, a front end cover, a rear end cover, and a piston movably arranged in the cylinder block. One side of the piston is equipped with a piston rod. A locking mechanism is arranged on the front end cover or the rear end cover. The locking mechanism arranged on the front end cover is used to limit the position at the end of the stroke when the piston rod extends out of the cylinder block, and the locking mechanism arranged on the rear end cover is used to limit the position at the beginning of the stroke when the piston rod retracts into the cylinder block. A locking groove is opened on the piston rod to cooperate with the locking mechanism to complete the locking of the piston rod. After the cylinder block is ventilated, it can drive the locking mechanism to unlock and make the piston rod move.

[0007] Preferably, the locking mechanism includes a cover plate and a movable cavity. A plunger lock block is movably arranged in the movable cavity. One end of the plunger lock block extends into the cylinder block. A movable column is assembled on the plunger lock block. A return spring is connected between the plunger lock block and the movable cavity. The return spring is used to drive the plunger lock block to limit the piston rod.

[0008] Preferably, the locking mechanism is arranged on the rear end cover. A bevel is provided at one end of the piston rod close to the rear end cover. The bevel is used to drive the plunger locking block to move, and the locking groove is arranged on the piston rod on the side close to the bevel.

[0009] Preferably, the locking mechanism is arranged on the front end cover, and the locking groove is arranged on the piston rod at the opposite side of the piston and the front end cover and close to the piston.

[0010] Preferably, a Y-shaped sealing ring is arranged in the movable cavity.

[0011] Preferably, a contact part is arranged on the contact surface between the inner wall of the movable cavity and the plunger locking block, and the contact part is made of zirconia ceramics.

[0012] Preferably, a roller is rotatably assembled on the plunger locking block, and the roller is used to reduce the friction force between the contact surface of the plunger locking block and the piston rod.

[0013] Advantages of the present utility model:

[0014] The present utility model provides a locking cylinder. Through the design of the present utility model, in the absence of an external power source, the locking mechanism only needs the air source connected to the cylinder body to work, without an additional power source, which is simpler in structure and more energy-saving, and can also be manually operated, reducing the labor cost and being more suitable for the long-term development of enterprises;

[0015] And when the cylinder suddenly loses the support of the external air source, the locking mechanism still limits the position of the piston rod, improving the safety of equipment use. Description of the drawings

[0016] The drawings described herein are used to provide a further understanding of the present utility model, and constitute a part of this application. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0017] Figure 1 is the overall cross-sectional view of Embodiment 1;

[0018] Figure 2 is Figure 1 the enlarged view of the structure at A in

[0019] Figure 3 is the overall cross-sectional view of Embodiment 2;

[0020] Figure 4 is the structural diagram of the positions of the roller, the locking groove and the piston rod in Embodiment 2;

[0021] Legend description:

[0022] 1. Cylinder block; 2. Front end cover; 3. Rear end cover; 4. Piston; 5. Piston rod; 51. Lock groove; 52. Bevel groove; 7. Lock mechanism; 71. Cover plate; 72. Active cavity; 73. Plunger lock block; 74. Active column; 75. Return spring; 8. Y-shaped sealing ring; 9. Contact part; 10. Roller. Detailed implementation mode

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0024] The following gives specific embodiments.

[0025] According to the different usage scenarios of the locked cylinder, it is divided into two embodiments

[0026] Embodiment 1:

[0027] Please refer to Figure 1 , Figure 2 , a locked cylinder according to the present invention includes a cylinder block 1, a front end cover 2, a rear end cover 3, and a piston 4 movably arranged in the cylinder block 1. A piston rod 5 is assembled on one side of the piston 4. A lock mechanism 7 is arranged on the front end cover 2 or the rear end cover 3. The lock mechanism 7 arranged on the front end cover 2 is used to limit the position of the end of the stroke when the piston rod 5 extends out of the cylinder block 1, and the lock mechanism 7 arranged on the rear end cover 3 is used to limit the position of the start of the stroke when the piston rod 5 retracts into the cylinder block 1. A lock groove 51 for cooperating with the lock mechanism 7 to lock the piston rod 5 is formed on the piston rod 5. After the cylinder block 1 is ventilated, it can drive the lock mechanism 7 to unlock and move the piston rod 5;

[0028] The lock mechanism 7 includes a cover plate 71 and a movable cavity 72. A plunger lock block 73 is movably arranged in the movable cavity 72. One end of the plunger lock block 73 extends into the cylinder block 1. A movable column 74 is assembled on the plunger lock block 73. A return spring 75 is connected between the plunger lock block 73 and the movable cavity 72. The return spring 75 is used to drive the plunger lock block 73 to limit the position of the piston rod 5. The lock mechanism 7 is arranged on the rear end cover 3. A bevel 52 is provided at one end of the piston rod 5 close to the rear end cover 3. The bevel 52 is used to drive the plunger lock block 73 to move. The lock groove 51 is arranged on the piston rod 5 on the side close to the bevel 52. During operation, the lock mechanism 7 is arranged on the rear end cover 3 to limit the position of the piston rod 5 at the initial position of the stroke when the piston rod 5 retracts into the cylinder block 1. The cylinder block 1 is connected to an external air source for operation. When the piston rod 5 moves from the front end cover 2 towards the rear end cover 3, at this time, the plunger lock block 73 extends into the cylinder block 1. When the piston rod 5 moves to the position of the plunger lock block 73, the bevel 52 contacts one end of the plunger lock block 73. As the piston rod 5 continues to move, the bevel 52 gradually pushes the plunger lock block 73 into the movable cavity 72, and at the same time, the return spring 75 is compressed. When the plunger lock block 73 moves to the position of the lock groove 51, the plunger lock block 73 is inserted into the lock groove 51 under the elastic potential energy of the return spring 75 to limit the position of the piston rod 5. Moreover, the structure of the plunger lock block 73 is stable, and the locking of the piston rod 5 is more stable and reliable. When the support of the external air source is suddenly lost, the lock mechanism 7 still limits the position of the piston rod 5, improving the safety of equipment use. When unlocking is required, external gas enters the space between the piston 4 and the rear end cover 3 through the rear end cover 3. Under the action of air pressure, the plunger lock block 73 is pushed and moves into the movable cavity 72, causing the plunger lock block 73 to leave the lock groove 51 and stop limiting the piston rod 5. At this time, continuous intake of gas into the cylinder block 1 can push the piston 4 to drive the piston rod 5 to move outwards. In the absence of an external air source, if a worker wants to unlock the lock mechanism 7 for the piston rod 5, they only need to pull the movable column 74 to pull the plunger lock block 73 away from the lock groove 51. Through the cooperation between the above structures, the lock mechanism 7 only needs to be connected to the air source connected to the cylinder block 1 to work, without an additional power source, making the structure simpler and more energy-saving, and it can also be operated manually.

[0029] Further, a Y-shaped sealing ring 8 is arranged in the movable cavity 72. During operation, when the plunger lock block 73 moves in the movable cavity 72, the Y-shaped sealing ring 8 ensures the sealing performance, prevents gas leakage in the cylinder block 1 from affecting the normal use of the air cylinder, and at the same time, the Y-shaped sealing ring 8 has a longer service life and better sealing performance.

[0030] Further, a contact portion 9 is provided on the contact surface between the inner wall of the movable cavity 72 and the plunger lock block 73. The contact portion 9 is made of zirconia ceramics. During operation, when the plunger lock block 73 moves, the contact portion 9 made of zirconia ceramics is constantly in contact with it. Zirconia ceramic materials have extremely high hardness and wear resistance, which can significantly reduce the friction with the plunger lock block 73, improve the smoothness and efficiency of its movement. In addition, ceramic materials have good chemical stability and are not easily reactive with the medium, making them suitable for a variety of working conditions.

[0031] Embodiment 2:

[0032] Please refer to Figure 3 , Figure 4 ; On the basis of Embodiment 1, the difference between Embodiment 2 and Embodiment 1 is that in Embodiment 2, the locking mechanism 7 is arranged at the position of the front end cover 2. The locking mechanism 7 is provided on the front end cover 2 to limit the position at the end of the stroke when the piston rod 5 extends out of the cylinder block 1. The locking groove 51 is opened on the piston rod 5 of the piston 4 opposite to the front end cover 2 and close to the piston 4; A roller 10 is rotatably assembled on the plunger lock block 73. The roller 10 is used to reduce the frictional force between the plunger lock block 73 and the piston rod 5. During operation, when the piston rod 5 moves towards the front end cover 2, the plunger lock block 73 on the locking mechanism 7 provided on the front end cover 2 is inserted into the locking groove 51 to limit the position of the piston rod 5. The working principle is the same as that of Embodiment 1 and will not be elaborated here.

[0033] In the description of this specification, the description with reference to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0034] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A locked cylinder, comprising a cylinder block (1), a front end cover (2), a rear end cover (3), and a piston (4) movably arranged in the cylinder block (1), wherein a piston rod (5) is assembled on one side of the piston (4), and is characterized in that: A locking mechanism (7) is provided on the front end cover (2) or the rear end cover (3). The locking mechanism (7) provided on the front end cover (2) is used to limit the position of the end of the stroke when the piston rod (5) extends out of the cylinder block (1), and the locking mechanism (7) provided on the rear end cover (3) is used to limit the position of the beginning of the stroke when the piston rod (5) retracts into the cylinder block (1). A locking groove (51) is formed on the piston rod (5) to cooperate with the locking mechanism (7) to lock the piston rod (5). After the cylinder block (1) is ventilated, the locking mechanism (7) can be driven to unlock so that the piston rod (5) moves.

2. The locking cylinder according to claim 1, characterized in that: The locking mechanism (7) includes a cover plate (71) and a movable cavity (72). A plunger lock block (73) is movably arranged in the movable cavity (72). One end of the plunger lock block (73) extends into the cylinder block (1). A movable column (74) is assembled on the plunger lock block (73). A return spring (75) is connected between the plunger lock block (73) and the movable cavity (72). The return spring (75) is used to drive the plunger lock block (73) to limit the piston rod (5).

3. A locked cylinder according to claim 1, wherein: The locking mechanism (7) is arranged on the rear end cover (3). A bevel (52) is formed at one end of the piston rod (5) close to the rear end cover (3). The bevel (52) is used to drive the plunger lock block (73) to move. The locking groove (51) is formed on the piston rod (5) on the side close to the bevel (52).

4. A locked cylinder according to claim 1, wherein: The locking mechanism (7) is arranged on the front end cover (2). The locking groove (51) is formed on the piston rod (5) on the opposite side of the piston (4) and the front end cover (2) and close to the piston (4).

5. The locking cylinder according to claim 2, wherein: A Y-shaped sealing ring (8) is arranged in the movable cavity (72).

6. The locking cylinder according to claim 2, wherein: A contact part (9) is arranged on the contact surface between the inner wall of the movable cavity (72) and the plunger lock block (73). The contact part (9) is made of zirconia ceramics.

7. A locked cylinder according to claim 2, characterized in that: A roller (10) is rotatably assembled on the plunger lock block (73). The roller (10) is used to reduce the friction force between the contact surface of the plunger lock block (73) and the piston rod (5).

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