Limiting device of pneumatic actuator

Abstract

The limiting device of the pneumatic actuator comprises a shell, two pistons are connected into the shell in a sliding mode, sliding frames are fixedly connected to the opposite sides of the two pistons, two racks are fixedly connected to one sides of the sliding frames, a connecting column with the bottom end penetrating through the shell is rotationally connected into the shell, and a limiting rod is fixedly connected to the bottom end of the connecting column. And the circumferential outer wall of the connecting column is in key connection with two gears meshed with the racks, one side of the shell is fixedly connected with two air pipes, the top end of the connecting column penetrates through the shell to be fixedly connected with a rotating column, and the circumferential outer wall of the rotating column is fixedly connected with two protruding blocks. According to the pneumatic actuator, abrasion between the gear and the rack can be reduced, the rotating angle of the valve is more accurate, the service life of the pneumatic actuator is prolonged, excessive rotation caused by opening and closing of the valve can be prevented, the using effect of the pneumatic actuator is improved, the plug pin can be automatically popped out, and the safety of the pneumatic actuator is improved. And the use convenience of the pneumatic actuator is improved.

Description

Technical Field

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

[0002] A pneumatic actuator is an actuator that uses air pressure to open, close or adjust a valve. It is also called a pneumatic actuator or a pneumatic device.

[0003] After searching, a pneumatic actuator limit device with patent number CN220396681U was found, which includes a pneumatic actuator body. The above device can provide buffering through the cooperation of a reset spring and a buffer plate to avoid wear caused by direct contact between the gear bar and the fixed block. However, the device is driven by the meshing of gears and racks, which is prone to wear over time, thereby causing unstable rotation of the driven valve. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a limit device for a pneumatic actuator.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A limit device for a pneumatic actuator comprises a shell, wherein two pistons are slidably connected inside the shell, and a slide is fixedly connected to one side of the two pistons, and two racks are fixedly connected to one side of the slide. A connecting column with a bottom end passing through the shell is rotatably connected inside the shell, and a circumferential outer wall key of the connecting column is connected to two gears meshing with the racks, and two air pipes are fixedly connected to one side of the shell, and a rotating column is fixedly connected to the top of the connecting column through the shell, and two protrusions are fixedly connected to the circumferential outer wall of the rotating column, and sliding holes penetrating the protrusions are provided on the tops of the two protrusions, and a latch is slidably connected in the sliding hole, and a plurality of slots are provided on the top outer wall of the shell, and the latch is plugged into the slots.

[0007] As a further solution of the utility model, the top and bottom of the slide are provided with limit grooves, a limit rod is slidably connected in the limit groove, a connecting block is fixedly connected to one side of the limit rod, and the connecting block is fixed to the shell.

[0008] As a further solution of the utility model, a spring is sleeved on the circumferential outer wall of the latch, one end of the spring is fixed to the latch, the other end of the spring is in contact with the protrusion, and a limiting component is provided on one side of the latch to fix the latch.

[0009] As a further solution of the utility model, the limiting component is a card block, which is fixedly connected to one side of the pin, and the bottoms of the two protrusions are provided with straight grooves connected to the sliding holes, so that the card block can move along the groove direction of the straight groove.

[0010] As a further solution of the present invention, the connecting column is located between the two pistons.

[0011] As a further solution of the present invention, the plurality of slots are evenly distributed in a circular shape.

[0012] As a further solution of the utility model, two symmetrically distributed L-shaped fixing feet are fixedly connected to the bottom outer wall of the shell.

[0013] The beneficial effects of the utility model are:

[0014] 1. Through the coordinated use of the latch and the slot, after the valve is opened by the pneumatic actuator, the latch is inserted into the slot to limit the rotation of the connecting column, thereby fixing the rotation angle of the valve, thereby reducing the wear between the gear and the rack, making the valve rotation angle more accurate, and prolonging the service life of the pneumatic actuator.

[0015] 2. By setting the limit rod, the limit rod can limit the position of the slide, thereby preventing excessive rotation of the valve when opening and closing, thereby improving the use effect of the pneumatic actuator.

[0016] 3. Through the setting of the spring, when the limiting component no longer limits the latch, the spring can push the latch to move upward, so that the latch is disengaged from the slot, so that the latch can be automatically popped out, thereby improving the convenience of using the pneumatic actuator. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the three-dimensional structure of a limit device for a pneumatic actuator proposed by the utility model;

[0018] Figure 2 A schematic cross-sectional view of the housing of a limit device for a pneumatic actuator proposed in the utility model;

[0019] Figure 3 It is a partial enlarged structural schematic diagram of a limit device of a pneumatic actuator proposed by the utility model;

[0020] Figure 4 This is a schematic diagram of a first partial cross-sectional structure of a limit device of a pneumatic actuator proposed by the utility model;

[0021] Figure 5 This is a second partial cross-sectional structural schematic diagram of a limit device for a pneumatic actuator proposed by the utility model.

[0022] In the figure: 1, housing; 2, rotating column; 3, slot; 4, slide; 5, rack; 6, connecting column; 7, gear; 8, piston; 9, limit rod; 10, connecting block; 11, limit slot; 12, protrusion; 13, spring; 14, latch; 15, sliding hole; 17, straight slot; 18, block. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. Based on the embodiments of the utility model, other embodiments obtained by ordinary technicians in this field without making creative work are all within the scope of protection of the utility model.

[0024] Reference Figure 1-Figure 5 A pneumatic actuator limit device comprises a shell 1, wherein two pistons 8 are slidably connected in the shell 1, and a slide 4 is fixed to the opposite sides of the two pistons 8 by bolts, and two racks 5 are fixed to one side of the slide 4 by bolts, and a connecting column 6 is rotatably connected in the shell 1, and the circumferential outer wall of the connecting column 6 is keyed to two gears 7 meshing with the rack 5, and two air pipes are welded on one side of the shell 1, and a rotating column 2 is welded on the top of the connecting column 6 through the shell 1, and two protrusions 12 are welded on the circumferential outer wall of the rotating column 2, and the tops of the two protrusions 12 are provided with sliding holes 15 penetrating the protrusions 12, and a latch 14 is slidably connected in the sliding hole 15, and a plurality of card slots 3 are provided on the top outer wall of the shell 1, and the latch 14 is plugged into the card slot 3, and the shell 1 is supplied with air through one of the air pipes. The body 1 is inflated, and the two pistons 8 are moved toward each other under the action of the gas. The two pistons 8 squeeze the gas between the two pistons 8 and discharge it through another air pipe during the movement. The two pistons 8 drive the slide 4 to move during the movement. The slide 4 drives the connecting column 6 to rotate through the meshing of the rack 5 and the gear 7. The connecting column 6 opens the valve. When the valve is opened to a suitable angle, the gas delivery is stopped, and then the pin 14 is pressed downward to insert the pin 14 into the slot 3, so that the connecting column 6 is limited by the pin 14 inserted into the slot 3, thereby fixing the opening angle of the valve, reducing the wear between the gear 5 and the rack 7, making the valve rotation angle more accurate, and improving the service life of the pneumatic actuator.

[0025] In order to prevent excessive rotation when the valve is opened or closed, a limit groove 11 is provided on the top and bottom of the slide 4, and a limit rod 9 is slidably connected in the limit groove 11. A connecting block 10 is welded on one side of the limit rod 9, and the connecting block 10 is fixed to the shell 1. When the slide 4 is moving, since the limit rod 9 is fixed to the shell 1 through the connecting block 10, the limit rod 9 will move in the limit groove 11. Therefore, the movement of the slide 4 is limited by the length of the limit groove 11 to prevent excessive rotation when the valve is opened or closed.

[0026] In the utility model, the circumferential outer wall of the latch 14 is sleeved with a spring 13, one end of the spring 13 is fixed to the latch 14, and the other end of the spring 13 is in contact with the protrusion 12. A limiting component is provided on one side of the latch 14 to fix the latch 14. The limiting component is a card block 18, and the card block 18 is welded on one side of the latch 14. A straight groove 17 connected to the sliding hole 15 is provided at the bottom of the two protrusions 12, so that the card block 18 moves along the groove direction of the straight groove 17. When the latch 14 moves downward, it squeezes the spring 13, and the latch 14 moves During the process, the block 18 will be driven to move downward along the straight groove 17. When the block 18 moves out of the straight groove 17, the latch 14 is rotated to make the block 18 misaligned with the straight groove 17. At this time, the latch 14 can be limited so that the latch 14 cannot move upward. When the block 18 is aligned with the straight groove 17, the latch 14 can automatically pop out and disengage from the slot 3 through the force of the spring 13. The connecting column 6 is located between the two pistons 8. The multiple slots 3 are evenly distributed in a circle. Two symmetrically distributed L-shaped fixing feet are welded to the bottom outer wall of the shell 1.

[0027] Working principle: When it is needed, the housing 1 is inflated through one of the air pipes. At this time, the two pistons 8 move toward each other under the action of the gas. The two pistons 8 squeeze the gas between the two pistons 8 and discharge it through the other air pipe. The two pistons 8 drive the slide 4 to move during the movement. The slide 4 drives the connecting column 6 to rotate through the meshing of the rack 5 and the gear 7. The connecting column 6 opens the valve. When the valve is opened to a suitable angle, the gas delivery is stopped, and then the latch 14 is pressed to move downward. The latch 14 squeezes the gas between the two pistons 8 and the gear 7. The spring 13 is compressed and inserted into the slot 3. The latch 14 will drive the block 18 to move downward along the straight groove 17 during the movement. When the block 18 moves out of the straight groove 17, the latch 14 is rotated to cause the block 18 to be misaligned with the straight groove 17. At this time, the latch 14 can be limited so that the latch 14 cannot move upward. The connecting column 6 is limited by inserting the latch 14 into the slot 3, thereby fixing the opening angle of the valve, reducing the wear between the gear 5 and the rack 7, making the valve rotation angle more accurate, and improving the service life of the pneumatic actuator.

[0028] In addition, the terms "installation", "setting", "connection" and "socketing" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements or components. Those skilled in the art can understand the specific meanings of the above terms in this application according to specific circumstances.

Claims

1. A pneumatic actuator limit device, comprising a housing (1), wherein two pistons (8) are slidably connected in the housing (1), and slides (4) are fixedly connected to opposite sides of the two pistons (8), and two racks (5) are fixedly connected to one side of the slide (4), and a connecting column (6) whose bottom end passes through the housing (1) is rotatably connected in the housing (1), and the circumferential outer wall of the connecting column (6) is key-connected to two gears (7) meshing with the racks (5), and one side of the housing (1) is fixedly connected to two air pipes, characterized in that: The top end of the connecting column (6) passes through the housing (1) and is fixedly connected to a rotating column (2); two protrusions (12) are fixedly connected to the circumferential outer wall of the rotating column (2); the tops of the two protrusions (12) are each provided with a sliding hole (15) penetrating the protrusions (12); a latch (14) is slidably connected in the sliding hole (15); a plurality of slots (3) are provided on the top outer wall of the housing (1), and the latch (14) is plugged into the slots (3).

2. A pneumatic actuator limit device according to claim 1, characterized in that: The top and bottom of the slide (4) are both provided with a limiting groove (11), a limiting rod (9) is slidably connected in the limiting groove (11), a connecting block (10) is fixedly connected to one side of the limiting rod (9), and the connecting block (10) is fixed to the housing (1).

3. The limiting device of a pneumatic actuator according to claim 1, characterized in that: A spring (13) is sleeved on the circumferential outer wall of the latch (14), one end of the spring (13) is fixed to the latch (14), and the other end of the spring (13) is in contact with the protrusion (12). A limiting component is provided on one side of the latch (14) to fix the latch (14).

4. A pneumatic actuator limit device according to claim 3, characterized in that: The limiting component is a clamping block (18), which is fixedly connected to one side of the latch (14). The bottoms of the two protrusions (12) are provided with straight grooves (17) connected to the sliding holes (15), so that the clamping block (18) can move along the groove direction of the straight grooves (17).

5. The limiting device of a pneumatic actuator according to claim 1, characterized in that: The connecting column (6) is located between the two pistons (8).

6. A limit device for a pneumatic actuator according to claim 1, characterized in that: The plurality of slots (3) are evenly distributed in a circular shape.

7. The limiting device of a pneumatic actuator according to claim 1, characterized in that: The bottom outer wall of the shell (1) is fixedly connected to two symmetrically distributed L-shaped fixing feet.

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