Spring reset type pneumatic actuator

Abstract

The utility model relates to the technical field of actuators, in particular to a spring reset type pneumatic actuator which comprises an air cylinder barrel, a piston and a spring, a first end cover and a second end cover are fixedly arranged at the two ends of the air cylinder barrel respectively, fixing lugs are oppositely and fixedly arranged on the outer side face of the first end cover, and an extension sleeve is fixedly arranged on the second end cover; a push rod is fixedly arranged on the other side of the piston, and a fixing hole and a connecting opening are formed in the first end cover. Two fixing plates are oppositely arranged outside the first end cover, and a fixing piece is arranged outside the air cylinder barrel. A first sealing strip and a second sealing strip are arranged outside the air cylinder barrel, sealing notches are formed in the side faces, close to each other, of the two fixing plates, a first sinking groove and a second sinking groove are formed in the inner walls of the sealing notches, and the inner side faces of the first sealing strip and the second sealing strip abut against the peripheral face of the push rod. According to the sealing device, the first sealing strip and the second sealing strip can be rapidly replaced only by independently disassembling the two fixing plates.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of actuators, in particular to a spring return type pneumatic actuator. BACKGROUND

[0002] As a key pneumatic component in automatic production equipment, the spring return type pneumatic actuator occupies an important position in the field of valve control due to its simple structure, convenient operation and high reliability. The actuator drives the internal piston to move by connecting the air source, thereby realizing the opening and closing operation of the valve. It is particularly worth mentioning that in the case of air supply interruption or failure, the built-in spring can automatically play a role to drive the valve to return to the preset safe position, which greatly enhances the safety and stability of the system.

[0003] In related technology, a pneumatic actuator includes a cylinder, a piston and a spring. The cylinder serves as the core component of the actuator, providing the necessary movement space for the piston and the spring and ensuring the stability of the entire structure. The flexible movement of the piston in the cylinder is achieved through precise control of the external air source. The output shaft at one end of the piston is directly connected to the valve, and each action of the actuator can be accurately converted into the on-off state of the valve. The sealing performance of the joint between the output shaft and the cylinder is crucial in this process. High-quality sealing elements such as O-rings and sealing rings are usually used to ensure that the gas does not leak and maintain the efficient operation of the actuator.

[0004] However, in actual application, these sealing elements are exposed to complex and variable working environments for a long time, and gradually lose their sealing effectiveness due to factors such as material aging, physical wear or chemical corrosion, causing gas leakage problems. Once the sealing fails, it will not only affect the normal operation of the actuator, but also may threaten the stable operation of the entire production line. Unfortunately, under the current design, the process of replacing these damaged sealing elements is extremely cumbersome. Due to the compact and complex structure of the joint between the output shaft and the cylinder, the entire pneumatic actuator often needs to be disassembled from the system before the sealing element can be accessed and replaced. This process not only consumes time and effort, but also requires maintenance personnel to have professional disassembly skills and tools, greatly increasing the difficulty and cost of equipment maintenance and repair, leaving room for improvement. CONTENT OF THE INVENTION

[0005] The purpose of the present application is to provide a spring return type pneumatic actuator to solve the problem of complexity and low efficiency in replacing the sealing element at the joint between the output shaft and the cylinder in the above-mentioned related technology.

[0006] The spring return type pneumatic actuator provided by the present application adopts the following technical solution:

[0007] The utility model provides a spring return type pneumatic actuator, including cylinder barrel, piston and spring, both ends of cylinder barrel are fixed with first end cover and second end cover respectively, the opposite fixed ear is set up on the outside surface of first end cover, the extension sleeve that is set up with cylinder barrel intercommunication and is used for spring is set up on the outside surface of second end cover, the end of spring is away from extension sleeve and piston abuts, the other side of piston is fixed with push rod, the fixed hole that is set up with push rod is passed through is set up in first end cover, and the interface that is connected with the outer connection gas supply pipe is set up, the two fixed plates that are located in the outer circumferential surface of push rod are oppositely arranged on the outside of first end cover, and the fixed part that can detachably install two fixed plates on first end cover is arranged on the outside of cylinder barrel, the first sealing strip and the second sealing strip are arranged on the outside of cylinder barrel, and the sealing gap is set up on the side of two fixed plates that are close to each other, the first recessed groove that is used for embedding first sealing strip and the second recessed groove that is used for embedding second sealing strip are set up on the inner wall of sealing gap, and the inner side surface of first sealing strip and second sealing strip is tightly closed with the outer circumferential surface of push rod.

[0008] By adopting the above technical scheme, when the first sealing strip and the second sealing strip need to be replaced, the locking of the two fixed plates can be quickly released by using the fixed part, and then the new first sealing strip and the second sealing strip can be replaced, and then the two fixed plates are fixed again by using the fixed part. Only by separately dismounting the two fixed plates, the first sealing strip and the second sealing strip can be quickly replaced, the corresponding time is reduced, and the replacement efficiency of the first sealing strip and the second sealing strip is improved.

[0009] Optionally, the side edges of the two fixed plates away from each other are fixedly provided with bending portions bent towards the cylinder barrel, and the limiting notches for clamping the outer edges of the first end cover are formed in the bending portions.

[0010] By adopting the above technical scheme, when the fixed ring is used to fix the two fixed plates, the outer edges of the first end cover are clamped into the limiting notches in advance, and then the fixed ring is sleeved on the outer periphery of the first end cover from top to bottom, so that the bending portions are clamped into the limiting recesses in the fixed ring, thereby fixing the mounting state of the two fixed plates.

[0011] Optionally, the bending portions are provided with elastic clamping members, and the positioning grooves for clamping the elastic clamping members are formed in the inner walls of the limiting recesses.

[0012] By adopting the above technical scheme, since the elastic clamping members and the positioning grooves are combined, when the fixed ring is sleeved on the outer periphery of the first end cover and the bending portions are clamped into the limiting recesses in the fixed ring, the elastic clamping members are clamped into the corresponding positioning grooves, thereby improving the mounting stability of the fixed ring and reducing the possibility of loosening or even falling off of the fixed ring from the outer periphery of the first end cover.

[0013] Optionally, a guide slope is arranged on the opening edge of the limiting groove.

[0014] By adopting the above technical scheme, since the guide slope is arranged on the edge of the limiting groove, the bending part is conveniently clamped into the limiting groove on the fixing ring along the guide slope.

[0015] Optionally, a protective shell is fixedly arranged on the side surface of the fixing ring towards the second end portion, and the protective shell is arranged outside the cylinder barrel and the extension sleeve after the fixing ring is installed.

[0016] By adopting the above technical scheme, since the protective shell is arranged on the fixing ring, when the pneumatic actuator is running, the protective shell protects the outside of the cylinder barrel and the extension sleeve after the fixing ring is installed, so that the possibility of damage to the outside of the cylinder barrel and the extension sleeve is reduced.

[0017] Optionally, a plurality of reinforcing ribs are fixedly arranged on the inner wall of the protective shell.

[0018] By adopting the above technical scheme, since the reinforcing ribs are arranged, the structural strength of the protective shell is enhanced, and the service life of the protective shell is prolonged.

[0019] Optionally, sound-absorbing cotton is fixedly arranged on the inner wall of the protective shell.

[0020] By adopting the above technical scheme, the influence of the noise generated by the pneumatic actuator during running on the external environment is reduced.

[0021] Optionally, an elastic pad is fixedly arranged on the side surface of the extension sleeve away from the cylinder barrel, and the side surface of the elastic pad away from the extension sleeve can abut against the inner wall of the protective shell.

[0022] By adopting the above technical scheme, since the elastic pad is arranged on the extension sleeve, the possibility of damage to the inner wall of the protective shell and the end portion of the extension sleeve due to collision is reduced, and the protection of the extension sleeve is enhanced.

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

[0024] 1. When the first sealing strip and the second sealing strip need to be replaced, the fixing member can be used to quickly release the locking of the two fixed plates, and then the new first sealing strip and the second sealing strip can be replaced, and then the fixing member is used to fix the two fixed plates again. Only the two fixed plates need to be disassembled to realize the quick replacement of the first sealing strip and the second sealing strip, which reduces the corresponding time and improves the replacement efficiency of the first sealing strip and the second sealing strip.

[0025] 2. When the pneumatic actuator is running, the application of the protective shell on the fixed ring sets up, and after the fixed ring is installed, the protective shell protects the outside of the cylinder barrel and the extension sleeve, thereby reducing the possibility of damage to the outside of the cylinder barrel and the extension sleeve. 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 the overall structure schematic diagram of the installation and cooperation of the cylinder barrel and the extension sleeve in the embodiment of the present application;

[0028] Figure 2 is the cross-sectional structure schematic diagram of the installation and cooperation of the piston in the embodiment of the present application;

[0029] Figure 3 is the structure schematic diagram of the installation and cooperation of the fixed plate in the embodiment of the present application;

[0030] Figure 4 is the exploded structure schematic diagram of the installation and cooperation of the fixed plate in the embodiment of the present application;

[0031] Figure 5 is the partial cross-sectional structure schematic diagram of the installation and cooperation of the fixed plate in the embodiment of the present application;

[0032] Figure 6 is Figure 5 the enlarged schematic diagram of part A in FIG. 7;

[0033] Figure 7 is Figure 5 the enlarged schematic diagram of part B in FIG. 7;

[0034] Figure 8 is the partial cross-sectional structure schematic diagram of the installation and cooperation of the reinforcing rib and the sound-absorbing cotton in the embodiment of the present application.

[0035] In the figure, 1, cylinder barrel; 11, first end cover; 111, fixed lug; 112, fixed hole; 113, connecting port; 12, second end cover; 13, extension sleeve; 131, positioning through hole; 14, elastic pad; 2, piston; 21, push rod; 22, indicating rod; 3, spring; 4, fixed plate; 41, sealing gap; 42, first recess; 43, second recess; 44, bent part; 441, limiting gap; 442, placing groove; 5, fixed part; 51, fixed ring; 511, limiting recess; 5111, guide slope; 512, positioning groove; 52, elastic clamping part; 521, compression spring; 522, arc-shaped protrusion; 53, protective shell; 531, clearance through hole; 532, reinforcing rib; 533, sound-absorbing cotton; 6, first sealing strip; 7, second sealing strip. 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 spring return type pneumatic actuator comprises a cylinder barrel 1, a piston 2 and a spring 3, the two ends of the cylinder barrel 1 are respectively provided with a first end cover 11 and a second end cover 12 through bolts, and a fixed lug 111 is arranged on the outer side of the first end cover 11;

[0039] An extension sleeve 13 is integrally formed on the outer side of the second end cover 12 and communicates with the inside of the cylinder barrel 1, and the spring 3 is arranged in the extension sleeve 13, the end of the spring 3 away from the extension sleeve 13 abuts against the piston 2, the other side of the piston 2 is provided with a push rod 21, and the first end cover 11 is provided with a fixed hole 112 for the push rod 21 to pass through and a connecting port 113 connected with an external gas supply pipe;

[0040] Before the pneumatic actuator is applied, the fixed lug 111 is fixed on the corresponding valve by penetrating the fixed lug 111 with a bolt, the outer end of the push rod 21 is fixedly connected with a valve rod on the valve, and the end of the external gas supply pipe is connected with the connecting port 113; when applied, compressed gas is injected into the cylinder barrel 1 from the connecting port 113, thereby extruding the spring 3, making the piston 2 reciprocate and driving the valve to open and close.

[0041] With reference to Figure 3 , Figure 4 , Figure 5 and Figure 6, two fixed plates 4 are arranged on the outer side of the first end cover 11 and located on the outer circumferential surface of the push rod 21, wherein the outer side of the cylinder barrel 1 is provided with a fixing piece 5 for detachably mounting the two fixed plates 4 on the first end cover 11; the outer side of the cylinder barrel 1 is provided with a first sealing strip 6 and a second sealing strip 7 made of rubber, and sealing notches 41 are formed on the mutually close sides of the two fixed plates 4, and first and second recesses 42 and 43 are formed on the inner walls of the sealing notches 41;

[0042] When the first and second sealing strips 6 and 7 are installed, the first sealing strip 6 is embedded into the first recess 42, and the second sealing strip 7 is embedded into the second recess 43; after the two fixed plates 4 are mounted by the fixing piece 5, the inner sides of the first and second sealing strips 6 and 7 abut against the outer circumferential surface of the push rod 21, so that the sealing performance of the joint between the push rod 21 and the first end cover 11 is enhanced by the double sealing of the first and second sealing strips 6 and 7.

[0043] With reference to Figure 4 and Figure 5 , the mutually far apart sides of the two fixed plates 4 are integrally formed with bent portions 44 bent towards the cylinder barrel 1, and limiting notches 441 are formed on the edges of the bent portions 44 for clamping the outer edges of the first end cover 11; the fixing piece 5 comprises a fixing ring 51 sleeved on the outer circumferential surface of the first end cover 11, and a limiting recess 511 is formed on the fixing ring 51 for clamping the bent portions 44, and a guide inclined surface 5111 is arranged on the opening edge of the limiting recess 511;

[0044] During the installation of the fixed plates 4, the outer edges of the first end cover 11 are clamped into the limiting notches 441, and then the fixing ring 51 is sleeved on the outer circumferential surface of the first end cover 11 from top to bottom, so that the bent portions 44 are clamped into the limiting recess 511 of the fixing ring 51, thereby fixing the installation state of the two fixed plates 4.

[0045] With reference to Figure 5 and Figure 7 , the bent portions 44 are provided with elastic clamping pieces 52, wherein the elastic clamping pieces 52 comprise compression springs 521 and arc-shaped lugs 522, and placing grooves 442 are formed on the bent portions 44 for placing the compression springs 521 and the arc-shaped lugs 522, one side of the arc-shaped lug 522 is pressed by the compression spring 521, so that part of the arc-shaped lug 522 protrudes from the opening of the placing groove 442, and the protruding part of the arc-shaped lug 522 is an arc surface, and the corresponding arc length of the arc surface is a minor arc, and a positioning groove 512 is formed on the inner wall of the limiting recess 511 for clamping the protruding part of the arc-shaped lug 522.

[0046] With reference to Figure 8The side away from the push rod 21 of the piston 2 is fixed with an indicating rod 22, and the extending sleeve 13 is provided with a positioning through hole 131 for the indicating rod 22 to pass through; the side towards the second end of the fixing ring 51 is integrally formed with a protective shell 53, and the protective shell 53 is provided with a giving through hole 531 for the indicating rod 22 to pass through;

[0047] The side away from the cylinder barrel 1 of the extending sleeve 13 is fixed with an elastic pad 14 made of rubber; after the fixing ring 51 and the protective shell 53 are installed, the protective shell 53 is sleeved outside the cylinder barrel 1 and the extending sleeve 13, and the side away from the extending sleeve 13 of the elastic pad 14 can abut against the inner wall of the protective shell 53.

[0048] Referring to Figure 8 The inner wall of the protective shell 53 is uniformly fixed with a plurality of reinforcing ribs 532, so as to enhance the structural strength of the protective shell 53; the inner wall of the protective shell 53 is fixed with sound-absorbing cotton 533, which is specifically polyester fiber cotton made of renewable polyester material and has good sound insulation effect and sound absorption effect, so as to reduce the influence of the noise generated by the pneumatic actuator during operation on the external environment.

[0049] The implementation principle of the embodiment of the present application is:

[0050] When the fixing part 5 installs the two fixing plates 4, the inner side of the first sealing strip 6 and the second sealing strip 7 abuts against the outer periphery of the push rod 21, so as to enhance the sealing performance of the joint between the push rod 21 and the first end cover 11 through the double sealing of the first sealing strip 6 and the second sealing strip 7; when the first sealing strip 6 and the second sealing strip 7 need to be replaced, the fixing ring 51 can be used to quickly release the locking of the two fixing plates 4, so as to replace the first sealing strip 6 and the second sealing strip 7, and then fix the two fixing plates 4 again.

[0051] Unless otherwise defined, the terms or scientific terms used in the present application should be understood as the usual meaning understood by a person with ordinary skills 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, quantity 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 change, the relative positional relationships may also change accordingly.

[0052] The embodiments of the present application are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, wherein 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 should be covered within the protection scope of the present application.

Claims

1. A spring-return pneumatic actuator, comprising a cylinder barrel (1), a piston (2) and a spring (3), a first end cover (11) and a second end cover (12) are fixedly arranged at two ends of the cylinder barrel (1) respectively, a fixed lug (111) is oppositely fixedly arranged on the outer side surface of the first end cover (11), and an extension sleeve (13) is fixedly arranged on the outer side surface of the second end cover (12) and communicates with the inside of the cylinder barrel (1) and is used for placing the spring (3); the end of the spring (3) away from the extension sleeve (13) abuts against the piston (2), a push rod (21) is fixedly arranged on the other side of the piston (2), a fixed hole (112) through which the push rod (21) penetrates is formed in the first end cover (11), and a connection port (113) connected with an external air supply pipe is formed in the first end cover (11). characterized in that Two fixed plates (4) are oppositely arranged on the outer part of the first end cover (11) and located on the outer peripheral surface of the push rod (21), and a fixing member (5) is arranged on the outer part of the cylinder barrel (1) and is used for detachably mounting the two fixed plates (4) on the first end cover (11); a first sealing strip (6) and a second sealing strip (7) are arranged on the outer part of the cylinder barrel (1), a sealing gap (41) is formed in the side surface of the two fixed plates (4) that are close to each other, a first recess (42) in which the first sealing strip (6) is embedded and a second recess (43) in which the second sealing strip (7) is embedded are formed in the inner wall of the sealing gap (41), and the inner side surfaces of the first sealing strip (6) and the second sealing strip (7) abut against the outer peripheral surface of the push rod (21).

2. A spring-return pneumatic actuator according to claim 1, characterized in that Bent portions (44) are fixedly arranged on the side edges of the two fixed plates (4) that are away from each other and are bent towards the cylinder barrel (1), and a limiting gap (441) in which the outer edge of the first end cover (11) is clamped is formed in the bent portion (44). The fixing member (5) comprises a fixing ring (51) sleeved on the outer periphery of the first end cover (11), and a limiting recess (511) in which the bent portion (44) is clamped is formed in the fixing ring (51).

3. A spring-return pneumatic actuator according to claim 2, wherein An elastic clamping member (52) is arranged on the bent portion (44), and a positioning groove (512) in which the elastic clamping member (52) is clamped is formed in the inner wall of the limiting recess (511).

4. A spring-return pneumatic actuator according to claim 2, wherein A guide inclined surface (5111) is arranged on the opening edge of the limiting recess (511).

5. A spring-return pneumatic actuator according to claim 2, wherein A protective shell (53) is fixedly arranged on the side surface of the fixing ring (51) towards the second end portion, and the protective shell (53) is sleeved on the outer part of the cylinder barrel (1) and the extension sleeve (13) after the fixing ring (51) is mounted.

6. A spring-return pneumatic actuator according to claim 5, wherein A plurality of reinforcing ribs (532) are fixedly arranged on the inner wall of the protective shell (53).

7. A spring-return pneumatic actuator according to claim 5, wherein Sound-absorbing cotton (533) is fixedly arranged on the inner wall of the protective shell (53).

8. A spring-return pneumatic actuator according to claim 5, wherein An elastic pad (14) is fixedly arranged on the side surface of the extension sleeve (13) away from the cylinder barrel (1), and the side surface of the elastic pad (14) away from the extension sleeve (13) can abut against the inner wall of the protective shell (53).

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