Straight-stroke pneumatic actuating mechanism

Abstract

The utility model relates to the technical field of pneumatic actuating mechanisms, and discloses a straight stroke pneumatic actuating mechanism which comprises a cylinder body, a piston arranged in the cylinder body in a sliding mode, an output rod fixedly connected to the piston and a pressure relief assembly arranged on the cylinder body, an adjusting rod is arranged in the cylinder body, one end of the adjusting rod is detachably connected with the piston, and the other end of the adjusting rod is detachably connected with the output rod. And the other end penetrates through the cylinder body and extends out of the cylinder body. The pneumatic actuating mechanism can solve the problems that in the prior art, a driving assembly can occupy the space in the air cylinder, the action stroke of the pneumatic actuating mechanism is affected, the working range of the pneumatic actuating mechanism is limited, and adaptability is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic actuators, in particular to a linear pneumatic actuator. Background Art

[0002] A linear pneumatic actuator is a device that uses compressed air as a power source to achieve linear motion. It typically consists of a cylinder and a piston. When compressed air enters one side of the cylinder, it pushes the piston to move linearly within the cylinder.

[0003] For example, a piston linear pneumatic actuator disclosed in Chinese patent [Publication No.: CN218440928U] includes a cylinder body, a piston plate is slidably connected to the cylinder body, a piston rod is fixed to the left side of the piston plate, a rotating cylinder is rotatably connected to the right side of the cylinder body, a handwheel is fixed to the right end of the rotating cylinder, a drive assembly is provided in the rotating cylinder, an air pipe is fixed to the bottom surface of the cylinder body, and a pressure relief assembly is provided on the top surface of the cylinder body.

[0004] When the air circuit or circuit fails, this patent can drive the drive assembly through the handwheel, and the drive assembly pushes the piston plate to move left and right. Manual operation is used instead of pneumatic operation to avoid the inconvenience of resetting when the piston linear stroke pneumatic execution encounters air or power outages, which in turn causes the product to be unable to be removed from the equipment, causing inconvenience.

[0005] However, in this device, the drive assembly occupies space in the cylinder, affecting the movement stroke of the pneumatic actuator, resulting in a limited working range of the pneumatic actuator and reduced adaptability. Utility Model Content

[0006] In view of this, the purpose of the present invention is to provide a straight-stroke pneumatic actuator to solve the problem in the prior art that the drive component occupies the space in the cylinder, affects the action stroke of the pneumatic actuator, and causes the working range of the pneumatic actuator to be limited and the adaptability to be reduced.

[0007] The utility model solves the above technical problems through the following technical means:

[0008] A linear pneumatic actuator comprises a cylinder, a piston slidably arranged in the cylinder, an output rod fixedly connected to the piston, and a pressure relief assembly arranged on the cylinder. An adjusting rod is arranged in the cylinder, one end of the adjusting rod is detachably connected to the piston, and the other end passes through the cylinder and extends outside the cylinder.

[0009] Furthermore, a connecting head is fixedly provided at the end of the adjusting rod, a first mounting hole is opened on the piston, the adjusting rod is slidably inserted into the first mounting hole, a limited area is provided in the piston, the connecting head is slidably provided in the limited area, and the limited area is used to limit the axial sliding of the connecting head along the output rod within the limited area.

[0010] Furthermore, a limiting ring is fixedly mounted on one end of the first mounting hole away from the output rod, and the limiting area is formed by the limiting ring and the inner end wall of the first mounting hole.

[0011] Furthermore, a storage chamber is provided at one end of the output rod close to the piston, the first mounting hole passes through the piston and is connected to the storage chamber, the diameter of the storage chamber 31 is smaller than the diameter of the first mounting hole, the limiting area is formed by the limiting ring and the end wall of the output rod, and a sliding groove is provided on the inner wall of the storage chamber. When the adjusting rod is rotated to align the connecting head with the sliding groove, the adjusting rod can slide into the storage chamber.

[0012] Furthermore, a second through hole is provided on the cylinder body, and the adjusting rod passes through the second through hole and extends to the outside of the cylinder body. The cylinder body is fixedly provided with a mounting tube outside the second through hole, and an annular groove is provided at one end of the adjusting rod close to the mounting tube. A fixing shell is slidably provided in the annular groove, and the fixing shell is threadedly connected to the mounting tube.

[0013] Furthermore, a sealing ring is provided between the fixing shell and the mounting cylinder.

[0014] Furthermore, the adjusting rod includes a first rod body and a second rod body, the first rod body is hinged to the second rod body, the first rod body is detachably connected to the piston, and the second rod body penetrates the cylinder body and extends to the outside of the cylinder body.

[0015] Furthermore, a third rod is provided between the first rod and the second rod. One end of the third rod is hinged to the first rod, and the other end of the third rod is hinged to the second rod.

[0016] Furthermore, a limit bar is provided at the hinge between the first rod and the second rod, and at the hinge between the third rod and the second rod, and the limit bar is used to prevent the first rod from rotating relative to the third rod, and to prevent the third rod from rotating relative to the second rod.

[0017] Beneficial effects of the utility model:

[0018] 1. The utility model provides an adjusting rod, one end of which is detachably connected to the piston. When the pneumatic actuator fails, the output rod can be controlled to move by moving the adjusting rod. The other end of the adjusting rod extends through the cylinder body to the outside of the cylinder, so that the redundant part of the adjusting rod is externalized to avoid affecting the stroke of the pneumatic actuator.

[0019] 2. The utility model provides a storage chamber, in which the adjusting rod can be stored when not in use, thereby preventing the adjusting rod from moving when the piston moves.

[0020] 3. The adjusting rod of the utility model is composed of a first rod body and a second rod body. When the adjusting rod is pulled out of the storage cavity, the first rod body and the second rod body can rotate relative to each other, which can reduce the space occupied by the adjusting rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a structural diagram of a linear pneumatic actuator of the utility model;

[0022] Figure 2 This is a schematic cross-sectional view of a linear pneumatic actuator of the present invention;

[0023] Figure 3 yes Figure 2 Schematic diagram of the enlarged structure of A;

[0024] Figure 4 yes Figure 2 Schematic diagram of the enlarged structure of B;

[0025] Figure 5 This is a partial structural diagram of the piston, output rod and adjusting rod in a linear pneumatic actuator of the utility model;

[0026] Figure 6 This is a schematic diagram of the split structure of the output rod and the regulating rod in a linear pneumatic actuator of the utility model;

[0027] in,

[0028] 1. Cylinder body; 11. Pressure relief assembly; 12. Air pipe; 13. Second through hole; 14. Mounting cylinder;

[0029] 2. Piston; 21. First mounting hole; 22. Limiting ring;

[0030] 3. Output rod; 31. Storage chamber; 32. Slide groove;

[0031] 4. Adjusting rod; 41. First rod; 42. Second rod; 43. Third rod; 44. Connector; 45. Annular groove; 46. Fixed housing; 47. Sealing ring;

[0032] 51. Slot; 52. Limit bar. DETAILED DESCRIPTION

[0033] The following describes the implementation of the present invention through specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are for illustrative purposes only and are only schematic diagrams, not actual drawings. They should not be understood as limiting the present invention. In order to better illustrate the embodiments of the present invention, some parts in the figures may be omitted, enlarged or reduced, and do not represent the dimensions of the actual product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the figures.

[0034] The same or similar numbers in the figures of the embodiments of the present invention correspond to the same or similar parts. In the description of the present invention, it should be understood that if the terms "up", "down", "left", "right", "front", "back", etc. indicate directions or positional relationships, they are based on the directions or positional relationships shown in the figures. This is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the figures are only used for illustrative purposes and cannot be understood as limitations on the present invention. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0035] like Figures 1-6 As shown, the present invention provides a linear pneumatic actuator, comprising a cylinder 1, a piston 2 slidably disposed within the cylinder 1, an output rod 3 fixedly connected to the piston 2, and a pressure relief assembly 11 disposed on the cylinder 1. The pressure relief assembly 11 is used to balance the air pressure inside and outside the cylinder 1 to facilitate smooth movement of the piston 2. This is well known in the prior art and will not be further elaborated upon here. It is understood that an air pipe 12 is connected to the cylinder 1 for inflating or discharging compressed air within the cylinder 1. An adjusting rod 4 is disposed within the cylinder 1. One end of the adjusting rod 4 is detachably connected to the piston 2, and the other end extends through the cylinder 1 and out of the cylinder 1. In the event of a malfunction in the linear pneumatic actuator, the output rod 3 can be controlled by pulling or pushing the adjusting rod 4. This avoids the inconvenience of resetting the piston 2 in the event of a gas or power outage, which could result in the product being unable to be removed from the device. Furthermore, since the excess portion of the adjusting rod 4 is externally located, it can be prevented from affecting the stroke of the pneumatic actuator.

[0036] In this embodiment, a connector 44 is fixedly mounted on the end of the adjusting rod 4. A first mounting hole 21 is defined in the piston 2, and the adjusting rod 4 is slidably inserted into the first mounting hole 21. A limited area is defined within the piston 2, and the connector 44 is slidably mounted within the limited area. The limited area is used to restrict the connector 44 from sliding axially along the output rod 3 within the limited area. By restricting the connector 44 within the limited area, a detachable connection between the adjusting rod 4 and the piston 2 is achieved. When the adjusting rod 4 moves, the piston 2 can be driven by the connector 44. In other embodiments, a detachable connection can also be achieved by threading the adjusting rod 4 and the piston.

[0037] In this embodiment, a limit ring 22 is fixedly mounted on the end of the first mounting hole 21 away from the output rod 3. The limit ring 22 can be fixedly connected to the piston 2 by welding or threading. The limit area is formed by the limit ring 22 and the inner end wall of the first mounting hole 21. In other embodiments, the adjustment rod 4 can also be directly fixedly connected to the piston 2.

[0038] In this embodiment, a storage chamber 31 is provided at one end of the output rod 3 near the piston, and a first mounting hole 21 passes through the piston 2 and is connected to the storage chamber 31. The diameter of the storage chamber 31 is smaller than the diameter of the first mounting hole 21. The limiting area is formed by the limiting ring 22 and the end wall of the output rod 3, and the connection head 44 is limited by the end wall of the output rod 3 and the limiting ring 22. A slide groove 32 is provided on the inner wall of the storage chamber 31. When the adjusting rod 4 is rotated to align the connection head 44 with the slide groove 32, the adjusting rod 4 can slide into the storage chamber 31. By sliding the adjusting rod 4 into the storage chamber 31, the pneumatic actuator will not drive the adjusting rod 4 to move when it is working, thereby reducing the influence of the adjusting rod 4 on the operation of the actuator. It should be noted that the output rod 3 and the piston 2 are connected by welding, one-piece molding and other connection methods to achieve a sealed connection.

[0039] In this embodiment, a second through hole 13 is formed on the cylinder body 1. The adjusting rod 4 extends through the second through hole 13 through the cylinder body 1 to the outside of the cylinder body 1. The adjusting rod 4 and the second through hole 13 are sealed. A mounting tube 14 is fixedly provided on the cylinder body 1 outside the second through hole 13. An annular groove 45 is formed on the end of the adjusting rod 4 near the mounting tube 14. A fixing shell 46 is slidably provided in the annular groove 45. The fixing shell 46 is threadedly connected to the mounting tube 14, and the annular groove 45 limits the fixing shell 46, thereby preventing the adjusting rod 4 from moving freely. A sealing ring 47 is provided between the fixing shell 46 and the mounting tube 14 to enhance the sealing performance between the adjusting rod 4 and the second through hole 13.

[0040] In this embodiment, the adjusting rod 4 includes a first rod body 41 and a second rod body 42. The first rod body 41 and the second rod body 42 are hingedly connected. The first rod body 41 is detachably connected to the piston 2, and the second rod body 42 extends through the cylinder body 1 and outside the cylinder body 1. When the adjusting rod 4 is pulled out of the storage chamber 31, the first rod body 41 and the second rod body 42 can rotate relative to each other, which can reduce the space occupied by the adjusting rod 4.

[0041] In this embodiment, a third rod 43 is disposed between the first rod 41 and the second rod 42. One end of the third rod 43 is hinged to the first rod 41, and the other end is hinged to the second rod 42. This embodiment does not limit the number of third rods 43; instead, two third rods 43 are provided, each hinged to the first rod 41 and the second rod 42. The two third rods 43 are hinged to each other. This reduces the length of the first rod 41 and the second rod 42, further reducing the space occupied by the adjustment rod 4.

[0042] In this embodiment, limit bars 52 are provided at the hinges between the first and third rods 41, 43, the third and second rods 42, and the two third rods 43. Slots 51 are provided on the second and third rods 42, 43. The limit bars 52 are slidably disposed within the slots 51 by elastic members (e.g., springs, shrapnel, etc.). The elastic members are used to cause the ends of the limit bars 52 to protrude outside the slots 51, thereby limiting the hinges between the first and third rods 41, 43, the second and third rods 42, 43, and the two third rods 43. This prevents the first, second, and third rods 41, 42, and 43 from rotating when not actively adjusted. By moving the limit bars 52 until they are fully retracted within the slots 51, the first, second, and third rods 41, 42, and 43 are released from their restraints.

[0043] In some other embodiments, the first rod 41 , the second rod 42 and the third rod 43 may be provided with a detachable connection such as a threaded connection or a clamping connection to avoid relative rotation in the case of non-active adjustment.

[0044] The working principle of this utility model is as follows:

[0045] When the pneumatic actuator is working normally, the piston 2 is pushed to move linearly in the cylinder by the compressed air. When the piston 2 moves linearly, the connector 44 of the first regulating rod 4 slides in the storage chamber 31.

[0046] When the pneumatic actuator is inconvenient to reset due to gas or power failure, unscrew the fixed shell 46 from the mounting tube 14, pull the second connecting rod, and pull the third connecting rod and the first connecting rod out of the storage chamber 31 until the limit ring 22 at the piston 2 of the connecting head 44 is abutted, and then, rotate the first connecting rod to stagger the connecting head 44 with the slide groove 32, and then move the first connecting rod to abut against the limit ring 22 through the connecting head 44 or the end wall of the output rod 3, drive the piston 2 to move, and then drive the output rod 3 to move, avoiding the inconvenience of resetting when the piston 2 linear pneumatic actuator is inconvenient to reset due to gas or power failure, which makes the product unable to be removed from the equipment and causes inconvenience.

[0047] The above embodiments are intended only to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and such modifications or equivalent substitutions shall be encompassed by the claims of the present invention. The techniques, shapes, and structural portions not described in detail in the present invention are well known.

Claims

1. A linear pneumatic actuator, comprising a cylinder (1), a piston (2) slidably disposed in the cylinder (1), an output rod (3) fixedly connected to the piston (2), and a pressure relief assembly (11) disposed on the cylinder (1), characterized in that: An adjusting rod (4) is arranged in the cylinder body (1); one end of the adjusting rod (4) is detachably connected to the piston (2), and the other end of the adjusting rod (4) penetrates the cylinder body (1) and extends to the outside of the cylinder body (1).

2. A linear stroke pneumatic actuator according to claim 1, characterized in that: A connector (44) is fixedly provided at the end of the adjusting rod (4), a first mounting hole (21) is provided on the piston (2), the adjusting rod (4) is slidably inserted in the first mounting hole (21), a limited area is provided in the piston (2), the connector (44) is slidably provided in the limited area, and the limited area is used to limit the axial sliding of the connector (44) along the output rod (3) in the limited area.

3. A linear pneumatic actuator according to claim 2, characterized in that: A limiting ring (22) is fixedly mounted on one end of the first mounting hole (21) away from the output rod (3), and the limiting area is formed by the limiting ring (22) and the inner end wall of the first mounting hole (21).

4. A linear stroke pneumatic actuator according to claim 3, characterized in that: A storage chamber (31) is provided at one end of the output rod (3) close to the piston (2); the first mounting hole (21) passes through the piston (2) and is in communication with the storage chamber (31); the diameter of the storage chamber (31) is smaller than the diameter of the first mounting hole (21); the limiting area is formed by a limiting ring (22) and an end wall of the output rod (3); a sliding groove (32) is provided on the inner wall of the storage chamber (31); when the adjusting rod (4) is rotated so that the connecting head (44) is aligned with the sliding groove (32), the adjusting rod (4) can slide into the storage chamber (31).

5. A linear stroke pneumatic actuator according to claim 1, characterized in that: The cylinder body (1) is provided with a second through hole (13), the adjusting rod (4) passes through the cylinder body (1) through the second through hole (13) and extends to the outside of the cylinder body (1), the cylinder body (1) is fixedly provided with a mounting tube (14) outside the second through hole (13), an annular groove (45) is provided at one end of the adjusting rod (4) close to the mounting tube (14), a fixing shell (46) is slidably provided at the annular groove (45), and the fixing shell (46) is threadedly connected to the mounting tube (14).

6. A linear stroke pneumatic actuator according to claim 5, characterized in that: A sealing ring (47) is provided between the fixing shell (46) and the mounting cylinder (14).

7. A linear pneumatic actuator according to claim 4, characterized in that: The adjusting rod (4) comprises a first rod body (41) and a second rod body (42); the first rod body (41) and the second rod body (42) are hingedly connected; the first rod body (41) and the piston (2) are detachably connected; and the second rod body (42) penetrates the cylinder body (1) and extends outside the cylinder body (1).

8. A linear stroke pneumatic actuator according to claim 7, characterized in that: A third rod (43) is arranged between the first rod (41) and the second rod (42); one end of the third rod (43) is hinged to the first rod (41), and the other end is hinged to the second rod (42).

9. A linear pneumatic actuator according to claim 8, characterized in that: A limit strip (52) is provided at the hinged joint between the first rod body (41) and the second rod body (42), and at the hinged joint between the third rod body (43) and the second rod body (42). The limit strip (52) is used to prevent the first rod body (41) from rotating relative to the third rod body (43), and to prevent the third rod body (43) from rotating relative to the second rod body (42).

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