Straight stroke pneumatic actuator

Abstract

The utility model relates to the technical field of actuators, in particular to a straight stroke pneumatic actuator which comprises an air cylinder barrel, a spring and a piston, a first baffle and a second baffle are fixedly arranged at the two ends of the air cylinder barrel respectively, a connecting opening is formed in one side of the first baffle, and an extending sleeve is fixedly arranged on the outer side face of the second baffle; a driving rod is fixedly arranged on the side face, away from the extending sleeve, of the piston, and a connecting through hole is formed in the first baffle. Two protective covers are oppositely arranged outside the air cylinder barrel, the two protective covers are detachably installed outside the air cylinder barrel, first protruding strips and second protruding strips are fixedly arranged on the inner side faces of the protective covers, first clamping grooves are formed in the first protruding strips, and second clamping grooves are formed in the second protruding strips; in the transportation process, after the two protective covers are detachably installed outside the air cylinder barrel, the outer end of the driving rod is protected, and the possibility that the outer end of the extension rod is damaged due to collision is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of actuators, and in particular to a straight-stroke pneumatic actuator. BACKGROUND

[0002] The straight-stroke pneumatic actuator, as a core component in the field of industrial automation control, plays a crucial role in controlling the opening and closing of straight-stroke devices such as valves, gates, and flapper doors, as well as the linear motion of other mechanical devices. This device uses compressed air to push the piston for linear motion, thereby converting pneumatic energy into mechanical force and achieving precise regulation of pipeline medium flow, pressure, and temperature.

[0003] In terms of technology, the straight-stroke pneumatic actuator typically includes key components such as a cylinder barrel, a piston, a connecting rod, and a return spring. The connecting rod, as a bridge connecting the cylinder and the valve inner valve, is self-evidently important. When compressed air is filled into the cylinder barrel, the strong air pressure pushes the piston to move forward, which in turn drives the connecting rod to act, thereby opening or closing the valve. When the air filling is stopped, the return spring plays a key role in pushing the piston and connecting rod back to position for the next action.

[0004] However, during the transportation of the straight-stroke pneumatic actuator, a problem that cannot be ignored gradually emerges. Since the outer end of the connecting rod is partially exposed outside under the action of the return spring, the connecting rod is prone to being bumped during transportation. Such bumps may not only cause scratches or indentations on the surface of the connecting rod, but in severe cases may even cause the connecting rod to deform, thereby affecting its normal connection with the valve. Once the connecting rod is deformed, the performance of the straight-stroke pneumatic actuator will be greatly compromised, and it may even fail to work normally, leaving room for improvement. CONTENT OF THE INVENTION

[0005] The purpose of the present application is to provide a straight-stroke pneumatic actuator that solves the problem of damage to the exposed outer end of the connecting rod due to transportation bumps in the related art.

[0006] The straight-stroke pneumatic actuator provided by the present application adopts the following technical solution:

[0007] The application discloses a straight stroke pneumatic actuator which comprises a cylinder barrel, a spring and a piston, the first baffle and the second baffle are fixedly arranged at the two ends of the cylinder barrel respectively, the side of the first baffle is provided with a connecting hole which is connected with an external gas supply pipe, the outer side surface of the second baffle is fixedly provided with an extension sleeve which is coaxial with the cylinder barrel and is communicated with the cylinder barrel, the two ends of the spring are abutted against the inner wall of the extension sleeve and the inner wall of the piston respectively, the side of the piston which is away from the extension sleeve is fixedly provided with a driving rod, the first baffle is provided with a connecting through hole which is penetrated by the driving rod, the outer part of the cylinder barrel is oppositely provided with two protective covers, the two protective covers are detachably arranged on the outer part of the cylinder barrel, the inner side surface of the protective cover is fixedly provided with a first convex strip and a second convex strip, the first convex strip is provided with a first clamping groove which is used for clamping the outer edge of the first baffle, the second convex strip is provided with a second clamping groove which is used for clamping the edge of the second baffle, and the part of the driving rod which extends to the outside is located in the interior of the two protective covers.

[0008] By adopting the technical scheme, after the two protective covers are detachably arranged on the outer part of the cylinder barrel in the transportation process, the outer edge of the first baffle is clamped into the first clamping groove, the outer edge of the second baffle is clamped into the second clamping groove, and the part of the driving rod which extends to the outside is located in the interior of the two protective covers, so that the outer end part of the driving rod is protected, and the possibility that the outer end part of the extension rod is damaged due to collision is reduced.

[0009] Optionally, the side edges of the two protective covers which are close to each other are rotationally connected through a rotating shaft, the side edges of the two protective covers which are away from the rotating shaft are fixedly provided with a fixed convex plate, the fixed convex plate is provided with a fixed through hole, and the outer part of the cylinder barrel is provided with a locking bolt which penetrates through the two fixed through holes and locks the two fixed convex plates.

[0010] By adopting the technical scheme, in the process that the protective cover is arranged on the outer part of the cylinder barrel, the two fixed convex plates are rotated to the state of abutting against each other along with the protective cover, at this time, the fixed through holes on the two fixed convex plates are coincided, and then the two fixed convex plates are locked by using the locking bolt, so that the protective cover is quickly arranged and fixed, and the subsequent disassembly is facilitated.

[0011] Optionally, the inner wall of the protective cover is provided with a limiting recess which is used for clamping the end part of the driving rod which is away from the piston.

[0012] By adopting the technical scheme, since the limiting recess is arranged on the inner wall of the protective cover, after the two protective covers are arranged on the outer part of the cylinder barrel, at this time, the end part of the driving rod is clamped into the corresponding limiting recess, so that the stability of the state of the outer end part of the driving rod is improved.

[0013] Optionally, the opening edges of the first clamping groove and the second clamping groove are provided with a guide inclined surface.

[0014] By adopting the technical scheme, the first baffle and the second baffle are facilitated to be clamped into the corresponding clamping grooves along the guide inclined surfaces, and the mounting efficiency of the protective cover is improved.

[0015] Optionally, an elastic anti-collision pad is fixed on the outer side surface of the protective cover.

[0016] By adopting the technical scheme, the possibility of damage of the protective cover due to collision during the transportation of the pneumatic actuator is reduced.

[0017] Optionally, a plurality of anti-skid protrusions are fixed on the elastic anti-collision pad.

[0018] By adopting the technical scheme, the possibility of relative sliding of the pneumatic actuator on the transport vehicle is reduced, and the stability during the transportation is improved.

[0019] Optionally, the two protective covers can be flipped and then coaxially arranged with the cylinder barrel again, so that the outer edge of the first baffle is clamped into the second clamping groove, and the outer edge of the second baffle is clamped into the first clamping groove; and the inner wall edge of the protective cover, which is away from the first protrusion after being flipped, can abut against the outer end of the extension sleeve.

[0020] By adopting the technical scheme, the protective cover can be flipped and then mounted outside the cylinder barrel during the operation of the pneumatic actuator, and the protective cover can be used to protect the pneumatic actuator during use, so that the two protective covers have multi-functional use.

[0021] Optionally, sound-absorbing cotton is fixed on the inner wall of the protective cover.

[0022] By adopting the technical scheme, the protective cover can be flipped and then mounted outside the cylinder barrel during the operation of the pneumatic actuator, and the sound-absorbing cotton can be used to reduce the noise generated during the operation of the pneumatic actuator, thereby reducing the noise interference on the working environment.

[0023] In summary, the present application has at least one of the following beneficial technical effects:

[0024] 1. During the transportation, the two protective covers are detachably mounted outside the cylinder barrel, the outer edge of the first baffle is clamped into the first clamping groove, the outer edge of the second baffle is clamped into the second clamping groove, and the part of the driving rod extending to the outside is located inside the two protective covers, so as to protect the outer end of the driving rod and reduce the possibility of damage of the outer end of the extension rod due to collision.

[0025] 2. The protective cover can be turned over and installed outside the cylinder barrel during the operation of the pneumatic actuator, which can protect the pneumatic actuator during use by the protective cover and reduce the noise generated during the operation of the pneumatic actuator by the sound-absorbing cotton. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0027] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application;

[0028] Figure 2 is a schematic diagram of the sectional structure of the embodiment of the present application embodying the installation cooperation of the piston;

[0029] Figure 3 is a schematic diagram of the structure of the embodiment of the present application embodying the protection of the driving rod by the protective cover;

[0030] Figure 4 is a schematic diagram of the sectional structure of the embodiment of the present application embodying the installation cooperation of the protective cover;

[0031] Figure 5 is a schematic diagram of the sectional structure of the embodiment of the present application embodying the installation cooperation of the elastic anti-collision pad;

[0032] Figure 6 is Figure 5 is an enlarged schematic diagram of part A in FIG. 6;

[0033] Figure 7 is a schematic diagram of the structure of the embodiment of the present application embodying the protection of the extension sleeve by the protective cover;

[0034] Figure 8 is a schematic diagram of the sectional structure of the embodiment of the present application embodying the protection of the extension sleeve by the protective cover.

[0035] In the figure, 1 is a cylinder barrel; 11 is a first baffle; 111 is a connection port; 112 is a connection through hole; 12 is a second baffle; 13 is an extension sleeve; 131 is a first through hole; 2 is a spring; 3 is a piston; 31 is an indicator rod; 4 is a driving rod; 5 is a protective cover; 51 is a first protrusion; 511 is a first clamping groove; 512 is a guide inclined surface; 52 is a second protrusion; 521 is a second clamping groove; 53 is a limiting recess; 531 is a limiting through hole; 54 is an elastic anti-collision pad; 541 is an anti-slip protrusion; 55 is sound-absorbing cotton; 56 is a fixed protruding plate; 561 is a fixed through hole; and 6 is a locking bolt. DETAILED DESCRIPTION

[0036] The application will be further described in detail below with reference to all the accompanying drawings.

[0037] Embodiment:

[0038] With reference to Figure 1 and Figure 2 , a straight stroke pneumatic actuator comprises a cylinder barrel 1, a spring 2 and a piston 3, wherein the first baffle plate 11 and the second baffle plate 12 are respectively fixed on both ends of the cylinder barrel 1 through bolts, a connecting hole 111 is formed on one side of the first baffle plate 11 and connected with an external air supply pipe, and an extension sleeve 13 coaxial with the cylinder barrel 1 is fixed on the outer side of the second baffle plate 12; the spring 2 is abutted against the inner wall of the extension sleeve 13 and the inner wall of the piston 3 at both ends, a driving rod 4 is fixed on the side of the piston 3 away from the extension sleeve 13, a connecting hole 112 is formed on the first baffle plate 11 for the driving rod 4 to pass through, an indicating rod 31 is fixed on the side of the piston 3 away from the driving rod 4, and a first through hole 131 is formed on the extension sleeve 13 for the indicating rod 31 to pass through.

[0039] During the operation of the valve actuator, the outer end of the driving rod 4 is connected with a valve rod in the valve, the external air supply pipe is connected with the connecting hole 111, compressed gas can be injected into the cylinder barrel 1 from the connecting hole 111, thereby extruding the piston 3 and compressing the spring 2, so as to drive the driving rod 4 to reciprocate; when the air supply is stopped, the compressed spring 2 is reset, thereby driving the piston 3 and the driving rod 4 to move downward; during the reciprocating movement of the piston 3, the staff can directly judge the state of the actuator through the indicating rod 31, which will not be described here.

[0040] With reference to Figure 2 and Figure 3 , two protective covers 5 are arranged on the outside of the cylinder barrel 1, the two protective covers 5 are detachably installed on the outside of the cylinder barrel 1, the inner side of the protective cover 5 is integrally formed with a first convex strip 51 and a second convex strip 52, a first clamping groove 511 is formed on the first convex strip 51, and a second clamping groove 521 is formed on the second convex strip 52.

[0041] During transportation, after the two protective covers 5 are detachably installed on the outside of the cylinder barrel 1, the outer edge of the first baffle plate 11 is clamped into the first clamping groove 511, the outer edge of the second baffle plate 12 is clamped into the second clamping groove 521, and the part of the driving rod 4 extending to the outside is located inside the two protective covers 5, so as to protect the outer end of the driving rod 4.

[0042] With reference to Figure 4The two protective covers 5 are connected by rotating shafts at one side edge close to each other, and each of the edges away from the rotating shafts is fixedly provided with a fixed flange plate 56, wherein a fixed through hole 561 is formed in the fixed flange plate 56, and the outer part of the cylinder barrel 1 is provided with a locking bolt 6 penetrating through the two fixed through holes 561 to lock the two fixed flange plates 56.

[0043] With reference to Figure 5 and Figure 6 , the opening edges of the first clamping groove 511 and the second clamping groove 521 are provided with guide inclined surfaces 512, so as to facilitate the clamping of the first baffle 11 and the second baffle 12 into the corresponding clamping grooves, and improve the installation performance; the inner wall of the protective cover 5 is provided with a limiting recess 53 for clamping the end of the driving rod 4 away from the piston 3, so as to improve the stability of the outer end of the driving rod 4 in this state.

[0044] With reference to Figure 5 , the outer side of the protective cover 5 is fixedly provided with an elastic anti-collision pad 54 made of rubber, and a plurality of anti-skid protrusions 541 are integrally formed on the elastic anti-collision pad 54, so as to reduce the possibility of damage to the protective cover 5 due to bumps during transportation.

[0045] With reference to Figure 7 and Figure 8 , the two protective covers 5 can be flipped and then coaxially arranged with the cylinder barrel 1; after flipping, the outer edge of the first baffle 11 is clamped into the second clamping groove 521, the outer edge of the second baffle 12 is clamped into the first clamping groove 511, and the inner wall edge of the protective cover 5 away from the first protrusion 51 after flipping can abut against the outer end of the extension sleeve 13; a limiting through hole 531 is formed in the inner wall of the limiting recess 53 for the indicator rod 31 to penetrate through, and the inner wall of the protective cover 5 is fixedly provided with sound-absorbing cotton 55.

[0046] The sound-absorbing cotton 55 is specifically polyester fiber cotton made of renewable polyester material, and has good sound insulation and sound absorption effects; during the operation of the pneumatic actuator, the protective cover 5 can be flipped and then installed outside the cylinder barrel 1, so as to protect the cylinder actuator during use by using the protective cover 5, and reduce the noise generated during the operation of the pneumatic actuator by using the sound-absorbing cotton 55, thereby reducing the noise interference on the working environment, and making the two protective covers 5 have multi-functional use.

[0047] The implementation principle of the embodiment of the application is as follows:

[0048] In the transportation process, after the two protective covers 5 are detachably installed outside the cylinder barrel 1, the outer edge of the first baffle 11 is clamped into the first clamping groove 511, the outer edge of the second baffle 12 is clamped into the second clamping groove 521, and the part of the driving rod 4 extending to the outside is located inside the two protective covers 5;

[0049] In the operation process of the pneumatic actuator, the protective cover 5 can be turned over and then installed outside the cylinder barrel 1 again, so that the protective cover 5 can be used to protect the cylinder actuator in the use process, and the noise absorbing cotton 55 can be used to reduce the noise generated in the operation process of the pneumatic actuator and reduce the noise interference on the working environment.

[0050] Unless otherwise defined, the terms or scientific terms used in the present application shall have the usual meanings understood by those skilled in the art to which the present application belongs. The terms "first", "second", "third" and the like used in the present application do not represent any order, number or importance, but are only used to distinguish different components. The terms "one" or "a" and the like do not represent a quantity limitation, but represent the existence of at least one. The terms "including", "containing" and the like mean that the elements or objects appearing before "including" or "containing" cover the elements or objects listed after "including" or "containing" and their equivalents, and do not exclude other elements or objects. The terms "upper", "lower", "left", "right" and the like only represent relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships may also be changed accordingly.

[0051] The embodiments of the present specific embodiment are the preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same parts are denoted by the same reference numerals. Therefore, any equivalent changes made according to the structure, shape and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A linear pneumatic actuator, comprising a cylinder (1), a spring (2) and a piston (3), wherein a first baffle (11) and a second baffle (12) are fixedly provided at both ends of the cylinder (1), a connecting port (111) for connecting to an external air supply pipe is provided on one side of the first baffle (11), and an extension sleeve (13) coaxial with and communicating with the cylinder (1) is fixedly provided on the outer side of the second baffle (12); both ends of the spring (2) abut against the inner wall of the extension sleeve (13) and the inner wall of the piston (3) respectively, and a drive rod (4) is fixedly provided on the side of the piston (3) away from the extension sleeve (13), and a connecting through hole (112) for the drive rod (4) to pass through is provided on the first baffle (11); Its features are, Two protective covers (5) are arranged opposite each other on the outside of the cylinder barrel (1). The two protective covers (5) are detachably installed on the outside of the cylinder barrel (1). A first protrusion (51) and a second protrusion (52) are fixed on the inner side of the protective cover (5). A first slot (511) is opened on the first protrusion (51) for the outer edge of the first baffle (11) to be inserted. A second slot (521) is opened on the second protrusion (52) for the edge of the second baffle (12) to be inserted. The part of the drive rod (4) extending to the outside is located inside the two protective covers (5).

2. A linear pneumatic actuator according to claim 1, characterized in that, The two protective covers (5) are connected by a rotating shaft on their adjacent side edges. The two protective covers (5) are fixed with a fixed protrusion (56) on their side edges away from the rotating shaft. The fixed protrusion (56) is provided with a fixed through hole (561). The cylinder (1) is provided with a locking bolt (6) that passes through the two fixed through holes (561) to lock the two fixed protrusions (56).

3. A linear pneumatic actuator according to claim 1, characterized in that, The inner wall of the protective cover (5) is provided with a limiting groove (53) for the end of the drive rod (4) away from the piston (3) to be inserted.

4. A linear pneumatic actuator according to claim 1, characterized in that, The first card slot (511) and the second card slot (521) are both provided with guide slopes (512) on the opening edges.

5. A linear pneumatic actuator according to claim 1, characterized in that, An elastic anti-collision pad (54) is fixed on the outer surface of the protective cover (5).

6. A linear pneumatic actuator according to claim 5, characterized in that, The elastic anti-collision pad (54) is fixed with several anti-slip protrusions (541).

7. A linear pneumatic actuator according to claim 1, characterized in that, The two protective covers (5) can be flipped over as a whole and then coaxial with the cylinder (1) again, so that the outer edge of the first baffle (11) is inserted into the second slot (521) and the outer edge of the second baffle (12) is inserted into the first slot (511); after the protective cover (5) is flipped over, the inner wall edge away from the first protrusion (51) can abut against the outer end of the extension sleeve (13).

8. A linear pneumatic actuator according to claim 7, characterized in that, Sound-absorbing cotton (55) is fixedly provided on the inner wall of the protective cover (5).

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