Three-position type pneumatic actuator

Abstract

The utility model relates to the technical field of pneumatic actuators, and discloses a three-position type pneumatic actuator which comprises an air cylinder body and end covers arranged at the two ends of the air cylinder body, a left piston and a right piston are arranged in the air cylinder body, the inner sides of the two end covers are fixedly connected with rod bodies, and the two pistons are arranged on the two rod bodies in a sliding and sealing mode respectively. Baffles are arranged on the two rod bodies in a sliding mode, an adjusting assembly is arranged between the two baffles, the adjusting assembly comprises a lead screw, a moving block and two connecting blocks, the lead screw is rotationally installed in the air cylinder body, the moving block is in threaded connection with the lead screw, one ends of the two connecting blocks are hinged to the two baffles correspondingly, and the other ends of the two connecting blocks are hinged to the two baffles correspondingly. And the other end is hinged with two sides of the moving block. The problems that in the prior art, opening adjusting nuts of the pull rod type adjusting mechanisms at the left end and the right end are adjusted respectively, on one hand, the adjusting accuracy of the two ends is difficult to guarantee, and on the other hand, the nuts at the two ends need to be adjusted respectively, which is troublesome are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of pneumatic actuators, in particular to a three-position 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 pneumatic device, and is generally referred to as a pneumatic head. Pneumatic actuators are usually composed of a cylinder, a piston, a gear shaft, an end cover, a seal, a screw, etc. According to the size of the control signal, it generates a corresponding thrust to push the regulating valve to operate. The regulating valve is the regulating part of the pneumatic actuator. Under the action of the thrust of the actuator, the regulating valve produces a certain displacement or angle of rotation to directly adjust the flow of the fluid.

[0003] Chinese patent [publication number: CN209540161U] discloses an air-to-close type pneumatic actuator with arbitrarily adjustable opening, including a cylinder body and end covers arranged at both ends of the cylinder body, a plurality of air ports are arranged on the cylinder body, and two left and right pistons are arranged in the cylinder body, the piston includes a piston disc and a piston arm integrally connected to the outer periphery of one side of the piston disc, a rack is arranged on the side of the piston arm close to the axis of the cylinder body, the tooth surfaces of the racks on the left and right pistons are opposite and both mesh with the output gear shaft, an elastic device is arranged between the piston and the end cover on the same side, the piston disc is fixed to one end of the pull rod, the other end of the pull rod passes through the end cover, and an opening adjustment nut is arranged between the end and the end cover. The pneumatic actuator can easily adjust the valve opening arbitrarily within the full stroke range of 0° to 95°.

[0004] When the above device adjusts the valve opening arbitrarily within the full stroke range of 0° to 95°, it is necessary to adjust the opening adjustment nuts of the left and right pull rod adjustment mechanisms respectively. On the one hand, it is difficult to ensure the accuracy of the adjustment at both ends. On the other hand, it is troublesome to adjust the nuts at both ends respectively. Utility Model Content

[0005] In view of this, the purpose of the utility model is to provide a three-position pneumatic actuator to solve the problem in the prior art that the opening adjustment nuts of the left and right end pull rod adjustment mechanisms are adjusted separately. On the one hand, it is difficult to ensure the accuracy of the adjustment at both ends, and on the other hand, it is troublesome to adjust the nuts at both ends separately.

[0006] The utility model solves the above technical problems through the following technical means:

[0007] A three-position pneumatic actuator comprises a cylinder body and end covers arranged at both ends of the cylinder body, wherein the cylinder body is provided with left and right pistons, the inner sides of the two end covers are fixedly connected with rod bodies, the two pistons are respectively slidingly and sealingly arranged on the two rod bodies, the two rod bodies are slidingly arranged with baffles, an adjustment component is arranged between the two baffles, the adjustment component comprises a screw rod, a moving block and two connecting blocks, the screw rod is rotatably installed in the cylinder body, the moving block is threadedly connected to the screw rod, one end of the two connecting blocks is respectively hinged to the two baffles, and the other end is hinged to the two sides of the moving block.

[0008] Furthermore, an adjusting rod is fixedly connected to the screw rod, a through hole is opened on the cylinder body, the adjusting rod is rotatably sealed and installed in the through hole, and the free end of the adjusting rod protrudes out of the cylinder body.

[0009] Furthermore, the adjusting assembly is provided with two groups, and the adjusting rods of the two groups of the adjusting assemblies are located on the same side of the cylinder body. An adjusting cover is rotatably provided outside the cylinder body, a gear ring is provided on the inner side of the adjusting cover, and an adjusting gear is provided on the outer end of the adjusting rod, and the two adjusting gears of the two adjusting rods are both engaged with the gear ring.

[0010] Furthermore, the outer wall of the cylinder body is provided with scale lines, the scale lines are distributed along the circumference of the adjustment cover, and the adjustment cover is provided with an indicator mark.

[0011] Furthermore, first limiting rings are provided at both ends of the screw rod.

[0012] Furthermore, a second limiting ring is provided at one end of the rod body away from the end cover.

[0013] Furthermore, a first hinge seat is arranged on the baffle, second hinge seats are arranged on both sides of the moving block, one end of the connecting block is hinged to the first hinge seat, and the other end is hinged to the second hinge seat.

[0014] Furthermore, an output gear is rotatably mounted in the cylinder body, a piston arm is connected to the side of the piston close to the output gear, a rack is arranged on the piston arm, and the racks on the two piston arms are meshed with the output gear.

[0015] Furthermore, an elastic component is arranged on one side of the piston close to the end cover.

[0016] Beneficial effects of the utility model:

[0017] 1. The utility model uses a baffle and an adjustment component, and the rotating screw drives the two baffles to slide synchronously on the rod body through a moving block and a connecting block, changing the limit position of the baffle on the piston, thereby changing the maximum opening of the valve. Compared with the prior art, the utility model can synchronously adjust the limit positions of the two pistons with high accuracy.

[0018] 2. The utility model provides an adjusting rod, and the screw rod can be driven to rotate by rotating the adjusting rod, which is easy to operate.

[0019] 3. The utility model can achieve synchronous adjustment of the baffle position and ensure the stability of the baffle during movement by providing an adjustment cover and two groups of adjustment components.

[0020] 4. The utility model can facilitate observation of the position of the baffle in the cylinder body by setting scale lines and indicator marks, thereby making it easy to understand the maximum opening of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of a three-position pneumatic actuator of the utility model. Figure 1 ;

[0022] Figure 2 This is a schematic diagram of the structure of a three-position pneumatic actuator of the utility model. Figure 2 ;

[0023] Figure 3 This is a schematic diagram of the split structure of a three-position pneumatic actuator of the utility model;

[0024] Figure 4 This is a schematic diagram of the cross-sectional structure of a three-position pneumatic actuator of the utility model. Figure 1 ;

[0025] Figure 5 This is a schematic diagram of the cross-sectional structure of a three-position pneumatic actuator of the utility model. Figure 2 ;

[0026] in,

[0027] 1. Cylinder body; 11. Air port; 12. Output gear; 13. Scale line;

[0028] 2. end cover; 21. rod body; 22. second limiting ring;

[0029] 3. Piston; 31. Piston arm;

[0030] 4. Elastic components;

[0031] 5. baffle; 51. first hinge seat;

[0032] 61. Screw rod; 611. First limiting ring; 62. Moving block; 621. Second hinge seat; 63. Connecting block;

[0033] 7. Adjustment rod; 71. Adjustment gear;

[0034] 8. Adjustment cover; 81. Gear ring; 82. Indicator mark. DETAILED DESCRIPTION

[0035] 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 contents disclosed in this specification. It should be noted that the illustrations provided in the following embodiments are only for exemplary descriptions, and they are only schematic diagrams, not physical diagrams, and cannot be understood as limitations on 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 size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the figures may be omitted.

[0036] 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 "upper", "lower", "left", "right", "front", "back", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the figures, they are only for the convenience of describing the present invention and simplifying the description, and do 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.

[0037] like Figure 1-Figure 5 As shown, a three-position pneumatic actuator of the utility model comprises a cylinder body 1 and end covers 2 arranged at both ends of the cylinder body 1, and the two end covers 2 are respectively sealed and connected to the two ends of the cylinder body 1. The inner sides of the two end covers 2 are fixedly connected with a rod body 21, and two left and right pistons 3 are arranged in the cylinder body 1, and the two pistons 3 are respectively slidingly sealed and arranged on the two rod bodies 21. It can be understood that the two pistons 3 divide the internal space of the cylinder body 1 into multiple cavities, and the positions of the cylinder body 1 and the end covers 2 corresponding to the cavities are provided with gas ports 11 for charging and discharging. An output gear 12 is rotatably installed in the cylinder body 1, and a piston arm 31 is connected to the side of the piston 3 close to the output gear 12, and a rack is arranged on the piston arm 31, and the racks on the two piston arms 31 are meshed with the output gear 12. The movement of the two pistons 3 is controlled by charging and discharging, and when the two pistons 3 move, the output gear 12 is driven to rotate by the rack of the piston arm 31, thereby realizing the opening and closing of the valve. In this embodiment, an elastic component 4 is arranged on the side of the piston 3 close to the end cover 2. The elastic component 4 is a spring group, which is used to provide a preload force, a reset force, etc. for the movement of the piston 3.

[0038] In this embodiment, baffles 5 are slidably provided on both rod bodies 21, and two groups of adjustment components are provided between the two baffles 5, the adjustment components including a screw rod 61, a moving block 62 and two connecting blocks 63, the screw rod 61 is rotatably installed in the cylinder body 1, the moving block 62 is threadedly connected to the screw rod 61, one end of the two connecting blocks 63 is respectively hinged to the two baffles 5, and the other end is hinged to the two sides of the moving block 62. By rotating the screw rod 61, the rotating screw rod 61 drives the two baffles 5 to slide synchronously on the rod body 21 through the moving block 62 and the connecting block 63, and changes the limit position of the baffle 5 to the piston 3, thereby changing the maximum opening of the valve.

[0039] In this embodiment, a first hinge seat 51 is provided on the baffle 5, and second hinge seats 621 are provided on both sides of the moving block 62. One end of the connecting block 63 is hinged to the first hinge seat 51, and the other end is hinged to the second hinge seat 621 to realize the transmission between the moving block 62 and the baffle 5.

[0040] It should be noted that first limiting rings 611 are provided at both ends of the screw rod 61. The two first limiting rings 611 limit the position of the connecting block 63 to prevent the connecting block 63 from slipping off the screw rod 61.

[0041] It should be noted that a second limiting ring 22 is provided at one end of the rod body 21 away from the end cover 2. The baffle plate 5 is limited by the second limiting ring 22 to prevent the baffle plate 5 from slipping off the rod body 21.

[0042] In this embodiment, the screw rod 61 is fixedly connected with an adjusting rod 7, and the adjusting rods 7 of the two adjusting assemblies are located on the same side of the cylinder body 1. A through hole is provided on the cylinder body 1, and the adjusting rod 7 is rotatably and sealably installed in the through hole, and the free end of the adjusting rod 7 protrudes outside the cylinder body 1. The screw rod 61 can be driven to rotate by rotating the adjusting rod 7 without disassembling the cylinder body 1, and the operation is simple.

[0043] In this embodiment, an adjusting cover 8 is rotatably provided outside the cylinder body 1, a gear ring 81 is provided inside the adjusting cover 8, an adjusting gear 71 is provided at the outer end of the adjusting rod 7, and both adjusting gears 71 of the two adjusting rods 7 are meshed with the gear ring 81. Rotating the adjusting cover 8 can make the two adjusting rods 7 rotate synchronously, further simplifying the operation and improving the convenience.

[0044] In this embodiment, the outer wall of the cylinder body 1 is provided with scale lines 13, which are distributed along the circumference of the adjustment housing 8, and an indicator mark 82 is provided on the adjustment housing 8. When rotating, by observing the scale lines 13 corresponding to the indicator mark 82, the position of the baffle 5 in the cylinder body 1 can be easily observed, so as to facilitate the understanding of the maximum opening of the valve.

[0045] When the maximum opening of the utility model regulating valve is:

[0046] First, the adjusting cover 8 is rotated to drive the adjusting rod 7 to rotate through the gear ring 81 and the adjusting gear 71. When the adjusting rod 7 rotates, the moving block 62 moves along the axial direction of the adjusting rod 7. When the moving block 62 moves, the baffle 5 is driven to move through the connecting block 63, thereby changing the position of the baffle 5 on the rod body 21, and then changing the moving stroke of the piston 3, so as to achieve the adjustment of the maximum opening of the valve.

[0047] The above embodiments are only used to illustrate the technical solution of the utility model and are not intended to limit it. Although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model. The technology, shape, and structure that are not described in detail in the utility model are all well-known technologies.

Claims

1. A three-position pneumatic actuator, comprising a cylinder body (1) and end covers (2) arranged at both ends of the cylinder body (1), wherein two left and right pistons (3) are arranged in the cylinder body (1), characterized in that: The inner sides of the two end covers (2) are fixedly connected with a rod body (21), the two pistons (3) are respectively slidably sealed on the two rod bodies (21), baffles (5) are slidably arranged on the two rod bodies (21), an adjustment component is arranged between the two baffles (5), and the adjustment component comprises a screw rod (61), a moving block (62) and two connecting blocks (63), the screw rod (61) is rotatably installed in the cylinder body (1), the moving block (62) is threadedly connected to the screw rod (61), one end of the two connecting blocks (63) is respectively hinged to the two baffles (5), and the other end is hinged to the two sides of the moving block (62).

2. A three-position pneumatic actuator according to claim 1, characterized in that: The screw rod (61) is fixedly connected with an adjusting rod (7), the cylinder body (1) is provided with a through hole, the adjusting rod (7) is rotatably sealed and installed in the through hole, and the free end of the adjusting rod (7) protrudes outside the cylinder body (1).

3. A three-position pneumatic actuator according to claim 2, characterized in that: The adjustment components are provided in two groups, and the adjustment rods (7) of the two groups of the adjustment components are located on the same side of the cylinder body (1). An adjustment cover (8) is rotatably provided outside the cylinder body (1), and a gear ring (81) is provided inside the adjustment cover (8). An adjustment gear (71) is provided at the outer end of the adjustment rod (7), and the two adjustment gears (71) of the two adjustment rods (7) are both meshed with the gear ring (81).

4. A three-position pneumatic actuator according to claim 3, characterized in that: The outer wall of the cylinder body (1) is provided with scale lines (13), and the scale lines (13) are distributed along the circumference of the adjustment housing (8). The adjustment housing (8) is provided with an indicator mark (82).

5. A three-position pneumatic actuator according to claim 1, characterized in that: Both ends of the screw rod (61) are provided with a first limiting ring (611).

6. A three-position pneumatic actuator according to claim 1, characterized in that: A second limiting ring (22) is provided at one end of the rod body (21) away from the end cover (2).

7. A three-position pneumatic actuator according to claim 1, characterized in that: The baffle (5) is provided with a first hinge seat (51), and second hinge seats (621) are provided on both sides of the moving block (62); one end of the connecting block (63) is hinged to the first hinge seat (51), and the other end is hinged to the second hinge seat (621).

8. The three-position pneumatic actuator according to claim 1, characterized in that: An output gear (12) is rotatably mounted in the cylinder body (1); a piston arm (31) is connected to a side of the piston (3) close to the output gear (12); a rack is provided on the piston arm (31); and the racks on the two piston arms (31) are meshed with the output gear (12).

9. A three-position pneumatic actuator according to claim 1, characterized in that: An elastic component (4) is provided on one side of the piston (3) close to the end cover (2).

Images