Stable starting type pneumatic actuator

Abstract

According to the technical scheme, the stable starting type pneumatic actuator is characterized by comprising an actuator body and a buffering mechanism, the two ends of the buffering mechanism are connected to the actuator body, the buffering mechanism comprises a connecting pipe, a control valve and a compression tank, and the compression tank communicates with the actuator body through the connecting pipe; the control valve is arranged on the connecting pipe; a driving rod, a linkage plate and a piston are arranged in the actuator body, one end of the linkage plate is connected with the piston, and the other end of the linkage plate is in transmission connection with the driving rod. The actuator body is provided with a trigger part, the trigger part is in linkage with the linkage plate and the control valve, and when gas is introduced into the actuator body, the linkage plate pushes the piston to move towards the two sides of the actuator body; in the process that the linkage plate moves towards the two sides, the linkage plate enables the control valve to be switched from the opening state to the closing state through the triggering part, and the pneumatic actuator can isolate the influence of hydraulic pressure on the air pressure cavity after moving in place.

Description

Technical Field

[0001] The present invention relates to a pneumatic actuator, and more specifically, to a smooth-start pneumatic actuator. Background Technology

[0002] A pneumatic actuator is an actuating device that uses air pressure to open, close, or regulate a valve. It is also called a pneumatic actuator mechanism or pneumatic device. Pneumatic actuators are sometimes equipped with certain auxiliary devices, such as valve positioners and handwheel mechanisms. Pneumatic actuators are widely used in automated production lines, assembly lines, and processing equipment.

[0003] To address the issue of smooth start-up, our company has previously applied for a pneumatic actuator with a buffer structure (publication number CN221401940U). This actuator utilizes an external buffer mechanism connected to the actuator via conduits and valves. By pre-filling piston A and the side cover with hydraulic oil, when the actuator starts and the pneumatic source drives piston A, piston A experiences resistance from the hydraulic oil, thus providing a buffering effect and preventing instantaneous impact forces during pneumatic start-up that could cause wear on the piston and related components. This buffer mechanism design effectively extends the actuator's lifespan.

[0004] As a single-acting pneumatic actuator, after controlling the opening and closing of the valve, it is necessary to continuously supply gas to keep the valve in a normally open position. Therefore, the hydraulic pressure of the hydraulic oil and the air pressure in the actuator are in conflict, requiring higher air pressure to drive the piston, which increases the consumption of compressed air and the operating cost. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a smooth-start pneumatic actuator that can isolate the influence of hydraulic pressure on the pneumatic chamber after it has moved into position.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a smooth-start pneumatic actuator, comprising an actuator body and a buffer mechanism, wherein the two ends of the buffer mechanism are respectively connected to the actuator body, the buffer mechanism includes a connecting pipe, a control valve, and a compression tank, the compression tank being connected to the actuator body through the connecting pipe, and the control valve being disposed on the connecting pipe; The actuator body is provided with a drive rod, a linkage plate and a piston. One end of the linkage plate is connected to the piston and the other end is connected to the drive rod for transmission. The actuator body is provided with a trigger part, which is linked to the linkage plate and the control valve respectively. When gas is introduced into the actuator body, the linkage plate pushes the piston to move to both sides of the actuator body. As the linkage plate moves to both sides, the linkage plate triggers the control valve to switch from the open state to the closed state.

[0007] The present invention is further configured such that: the triggering part includes a lever, a linkage rod, and a rotating block, wherein the lever is rotatably connected to the actuator body; A sliding groove is provided on one side of the lever, and one end of the linkage rod is slidably connected to the sliding groove. A positioning groove is provided inside the actuator body, and the middle part of the linkage rod is located in the positioning groove. The rotating block is mounted on the valve stem of the control valve, and the rotating block and the linkage rod are provided with a transmission structure that meshes with each other. The linkage plate is equipped with a lever structure for driving the lever to rotate.

[0008] The present invention is further configured such that: both the linkage rod and the rotating block are provided in two sets, and the two linkage rods are linked and cooperate with the lever; The two rotating blocks are respectively mounted on the valve stems of the two control valves. When the valve stems rotate, the control valves switch from the open state to the closed state.

[0009] The present invention is further configured such that: a positioning block is provided on the lever, and a positioning groove that cooperates with the positioning block is provided in the actuator body; the positioning groove is provided in two sets, corresponding to the two angular states of the lever being in the initial position and the position after rotation, respectively. When gas is introduced into the actuator body to move the linkage plate, the lever rotates from position state one to position state two, at which time the control valve switches from the open state to the closed state. When the actuator body exhausts air to the outside to reset the linkage plate, the lever rotates from position state two to position state one, at which time the control valve switches from the closed state to the open state.

[0010] The present invention is further configured such that: two vent holes are provided on one side of the actuator body, and the compression tank is connected to the vent holes through a connecting pipe.

[0011] The present invention is further configured such that: the compression tank is provided with an adjustment mechanism, a mounting plate, a buffer spring and a buffer plate, and two sets of mounting plates are provided and symmetrically distributed along the center of the compression tank, and the two mounting plates divide the inner cavity of the compression tank into a first hydraulic chamber, an adjustment chamber and a second hydraulic chamber; The adjustment mechanism is disposed inside the adjustment cavity, and both ends of the adjustment mechanism are connected to the mounting plate. The adjustment mechanism is used to synchronously adjust the distance between the mounting plate and the center of the compression tank. The buffer plate and the buffer spring are provided in two sets, and are respectively installed in the first hydraulic chamber and the second hydraulic chamber. One end of the buffer spring abuts against the buffer plate, and the other end is installed on the mounting plate.

[0012] The present invention is further configured such that: the adjustment mechanism includes an adjustment motor, a gear assembly, an adjustment screw, and an adjustment head, wherein the adjustment motor is linked to the adjustment screw through the gear assembly; The adjusting screw has reverse threaded portions at both ends, and the adjusting head has two sets, which are respectively connected to the reverse threaded portions at both ends.

[0013] The present invention is further configured such that: the gear assembly includes a drive gear, a reduction gear, and a transmission gear; the drive gear is connected to an adjusting motor; the reduction gear has a "T" shaped structure; and the reduction gear meshes with the drive gear and the transmission gear respectively. The transmission gear is mounted on the adjusting screw.

[0014] The invention is further configured such that: a connecting frame is provided inside the compression tank, the reduction gear is mounted on the connecting frame, and the connecting frame and the adjusting motor are respectively mounted on both sides of the center of the compression tank.

[0015] The present invention is further configured such that: auxiliary pipes communicating with the compression tank are provided at both ends of the actuator body, and a one-way valve is provided in the auxiliary pipe.

[0016] In summary, the present invention has the following beneficial effects: by adding a valve control structure, when gas is introduced into the actuator body to move the linkage plate, the control valve switches from the open state to the closed state, thus isolating the hydraulic pressure in the compression tank from the piston and ensuring the stability of the actuator body in the continuously open state.

[0017] When air is released from the actuator body, the piston and linkage plate are reset by the action of the internal spring. At this time, the control valve switches from the closed state to the open state, waiting for the next operation. Attached Figure Description

[0018] Figure 1 A three-dimensional structural diagram of a pneumatic actuator; Figure 2 A three-dimensional structural diagram of the actuator body; Figure 3 This is a three-dimensional structural diagram of the trigger section; Figure 4 This is a three-dimensional structural diagram of the buffer mechanism; Figure 5 This is a three-dimensional structural diagram of the adjustment mechanism.

[0019] Reference numerals: 1. Actuator body; 11. Drive rod; 12. Linkage plate; 121. Toggle block structure; 13. Piston; 2. Buffer mechanism; 21. Connecting pipe; 22. Control valve; 23. Compression tank; 24. First hydraulic chamber; 25. Adjustment chamber; 26. Second hydraulic chamber; 3. Trigger part; 31. Toggle rod; 311. Positioning block; 32. Linkage rod; 33. Rotating block; 4. Adjustment mechanism; 41. Adjustment motor; 42. Gear assembly; 421. Drive gear; 422. Reduction gear; 423. Transmission gear; 43. Adjustment screw; 44. Adjustment head; 5. Mounting plate; 6. Buffer spring; 7. Buffer plate; 8. Connecting frame; 9. Auxiliary pipe; 91. Check valve. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] Reference Figures 1 to 5 As shown, in order to achieve the above objectives, the present invention provides the following technical solution: a smooth start pneumatic actuator, including an actuator body 1 and a buffer mechanism 2, the two ends of the buffer mechanism 2 are respectively connected to the actuator body 1, the buffer mechanism 2 includes a connecting pipe 21, a control valve 22 and a compression tank 23, the compression tank 23 is connected to the actuator body 1 through the connecting pipe 21, and the control valve 22 is disposed on the connecting pipe 21; The actuator body 1 is provided with a drive rod 11, a linkage plate 12 and a piston 13. One end of the linkage plate 12 is connected to the piston 13 and the other end is connected to the drive rod 11 for transmission. The actuator body 1 is provided with a trigger part 3, which is linked to the linkage plate 12 and the control valve 22 respectively. When gas is introduced into the actuator body 1, the linkage plate 12 pushes the piston 13 to move to both sides of the actuator body 1. As the linkage plate 12 moves to both sides, the linkage plate 12 causes the control valve 22 to switch from the open state to the closed state through the trigger part 3.

[0022] Based on the prior application, the present invention adds a valve control structure. When gas is introduced into the actuator body 1 and the linkage plate 12 moves, the control valve 22 switches from the open state to the closed state. At this time, the hydraulic pressure in the compression tank 23 is isolated from the piston 13, ensuring the stability of the actuator body 1 in the continuously open state.

[0023] When the actuator body 1 releases air, the piston 13 and the linkage plate 12 are reset under the action of the internal spring. At this time, the control valve 22 switches from the closed state to the open state, waiting for the next operation.

[0024] The present invention is further configured such that: the triggering part 3 includes a lever 31, a linkage rod 32 and a rotating block 33, and the lever 31 is rotatably connected to the actuator body 1; A sliding groove is provided on one side of the lever 31, and one end of the linkage rod 32 is slidably connected in the sliding groove. A positioning groove is provided inside the actuator body 1, and the middle part of the linkage rod 32 is located in the positioning groove. The rotating block 33 is mounted on the valve stem of the control valve 22, and the rotating block 33 and the linkage rod 32 are provided with a transmission structure that meshes with each other. The linkage plate 12 is provided with a lever structure 121 for pushing the lever 31 to rotate.

[0025] The design of this structure allows the linkage rod 32 to move along the sliding groove and the positioning groove when the lever 31 is rotated. During the movement, the rotating block 33 is rotated through the meshing transmission structure. Since the rotating block 33 is fixedly connected to the valve stem, the opening and closing state of the control valve 22 can be changed, for example, from the open state to the closed state.

[0026] The transmission structure can be a gear or rack structure.

[0027] like Figure 2 The shown lever structure 121 can be a left lever and a right lever mounted on the linkage plate 12. It should be noted that the extension length of the left lever is shorter than that of the right lever. The structure is designed so that when the left lever moves to the right and pushes the lever 31 to rotate, the linkage plate 12 continues to move after rotation, at which point the left lever can be misaligned with the lever 31.

[0028] When the linkage plate 12 is reset, since the length of the right lever is greater than the length of the left lever, the right lever can abut against the lever 31, thereby causing the lever 31 to rotate and reset.

[0029] The present invention is further configured such that: both the linkage rod 32 and the rotating block 33 are provided with two sets, and the two linkage rods 32 are linked and cooperate with the lever 31; Two rotating blocks 33 are respectively mounted on the valve stems of the two control valves 22. When the valve stems rotate, the control valves 22 switch from the open state to the closed state. In this design, since the actuator body 1 has an air hole for gas delivery on one side, it is preferable to place the linkage rod 32 and the rotating blocks 33 on the side away from the air hole, which also facilitates the arrangement of the buffer mechanism 2.

[0030] When lever 31 moves, the linkage rods 32 on both sides move in the same direction. The corresponding valve adjustment method can be adapted according to the corresponding linkage direction.

[0031] The present invention is further configured such that: a positioning block 311 is provided on the lever 31, and a positioning groove that cooperates with the positioning block 311 is provided in the actuator body 1. There are two sets of positioning grooves, which correspond to the two angle states of the lever 31 when it is in the initial position and the position after rotation, respectively. When gas is introduced into the actuator body 1 to move the linkage plate 12, the lever 31 rotates from position state one to position state two, at which time the control valve 22 switches from the open state to the closed state. When the actuator body 1 exhausts air to the outside to reset the linkage plate 12, the lever 31 rotates from position state two to position state one, at which time the control valve 22 switches from the closed state to the open state.

[0032] The invention is further configured such that: two vent holes are provided on one side of the actuator body 1, and the compression tank 23 is connected to the vent holes via a connecting pipe 21. Figure 1 As shown, the design of the vent position facilitates its cooperation with the buffer mechanism 2, and also allows for the movement of the two linkage rods 32 by a set of levers 31.

[0033] It is important to note that Figure 2 , Figure 3 The linkage rod 32 structure on the left side is omitted.

[0034] The present invention is further configured such that: an adjustment mechanism 4, a mounting plate 5, a buffer spring 6 and a buffer plate 7 are provided inside the compression tank 23; two sets of mounting plates 5 are provided and are symmetrically distributed along the center of the compression tank 23; the two mounting plates 5 divide the inner cavity of the compression tank 23 into a first hydraulic chamber 24, an adjustment chamber 25 and a second hydraulic chamber 26. The adjustment mechanism 4 is located inside the adjustment cavity 25, and both ends of the adjustment mechanism 4 are connected to the mounting plate 5. The adjustment mechanism 4 is used to synchronously adjust the distance between the mounting plate 5 and the center of the compression tank 23. Two sets of buffer plates 7 and buffer springs 6 are provided and are respectively installed in the first hydraulic chamber 24 and the second hydraulic chamber 26. One end of the buffer spring 6 abuts against the buffer plate 7 and the other end is installed on the mounting plate 5.

[0035] By adjusting the design of the mechanism 4, the positions of the two mounting plates 5 are changed simultaneously, and the clamping force on one side of the buffer spring 6 is changed, so that the force exerted by the buffer spring 6 on the buffer plate 7 changes, thereby achieving the effect of controlling the buffering effect.

[0036] The present invention is further configured such that: the adjustment mechanism 4 includes an adjustment motor 41, a gear assembly 42, an adjustment screw 43 and an adjustment head 44, wherein the adjustment motor 41 is linked to the adjustment screw 43 through the gear assembly 42; The adjusting screw 43 has reverse threaded portions at both ends, and two sets of adjusting heads 44 are respectively connected to the reverse threaded portions at both ends. With this design, when the adjusting motor 41 starts, the adjusting screw 43 rotates via the gear assembly 42. Because the adjusting screw 43 has reverse threaded portions at both ends, the adjusting heads 44 on both sides move in opposite directions when the adjusting screw 43 rotates, ensuring the stability of the spring clamping force on both sides.

[0037] like Figure 4 As shown, the adjusting screw 43 includes a screw frame and a screw body. The screw frame is fixedly installed on the compression tank 23, and the screw body is rotatably connected to the screw frame.

[0038] The present invention is further configured such that: the gear assembly 42 includes a drive gear 421, a reduction gear 422 and a transmission gear 423, the drive gear 421 is connected to the regulating motor 41, the reduction gear 422 is configured in a "T" shape, and the reduction gear 422 is meshed with the drive gear 421 and the transmission gear 423 respectively; The transmission gear 423 is mounted on the adjusting screw 43. This structure is designed to allow the adjusting motor 41 to reduce speed while simultaneously driving the adjusting screw 43 to rotate.

[0039] The reduction gear 422 has a T-shaped structure, including a small gear at the first end and a large gear at the second end. According to the principle of the reducer, multiple reduction gears 422 can be set according to the spatial arrangement.

[0040] The invention is further configured such that: a connecting frame 8 is provided inside the compression tank 23, and a reduction gear 422 is mounted on the connecting frame 8; the connecting frame 8 and the adjusting motor 41 are respectively mounted on both sides of the center of the compression tank 23. This structural design ensures the stability of the rotation of the reduction gear 422, as the reduction gear 422 is rotatably connected to the connecting frame 8 and the connecting frame 8 is fixedly mounted on the compression tank 23.

[0041] In addition, the design of the connecting bracket 8 can balance the weight of the adjusting motor 41, so that the weight inside the compression tank 23 is balanced.

[0042] The present invention is further configured such that: auxiliary pipes 9 connected to the compression tank 23 are provided at both ends of the actuator body 1, and a one-way valve 91 is provided in the auxiliary pipes 9.

[0043] With this structure, when the control valve 22 is closed, the linkage plate 12 will still remain in a moving state. At this time, the hydraulic pressure on the piston 13 side will increase. Through the design of the one-way valve 91, when the hydraulic pressure increases, the hydraulic oil can flow back to the compression tank 23 through the auxiliary pipe 9. It should be noted that the one-way valve 91 only has a one-way conduction function.

[0044] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A smooth starting pneumatic actuator comprising an actuator body (1) and a buffer mechanism (2), both ends of the buffer mechanism (2) being connected to the actuator body (1), characterized in that: The buffer mechanism (2) comprises a connecting pipe (21), a control valve (22) and a compression tank (23), the compression tank (23) is communicated with the actuator body (1) through the connecting pipe (21), and the control valve (22) is arranged on the connecting pipe (21); The actuator body (1) is provided with a driving rod (11), a linkage plate (12) and a piston (13), one end of the linkage plate (12) is connected with the piston (13), and the other end is in transmission connection with the driving rod (11); The actuator body (1) is provided with a trigger part (3), the trigger part (3) is arranged in linkage with the linkage plate (12) and the control valve (22) respectively, when the gas is introduced into the inside of the actuator body (1), the linkage plate (12) pushes the piston (13) to move to both sides of the actuator body (1); When the linkage plate (12) moves to both sides, the linkage plate (12) makes the control valve (22) switch from the open state to the closed state through the trigger part (3).

2. A smooth starting pneumatic actuator according to claim 1, characterized in that: The trigger part (3) comprises a lever (31), a linkage rod (32) and a rotating block (33), the lever (31) is rotatably connected in the actuator body (1); One side of the lever (31) is provided with a sliding groove, one end of the linkage rod (32) is slidably connected in the sliding groove, and the actuator body (1) is provided with a positioning groove, and the middle part of the linkage rod (32) is located in the positioning groove; The rotating block (33) is arranged on the valve rod of the control valve (22), and the rotating block (33) and the linkage rod (32) are provided with transmission structures that are engaged with each other; The linkage plate (12) is provided with a push block structure (121) for pushing the lever (31) to rotate.

3. A smooth starting pneumatic actuator according to claim 2, characterized in that: The linkage rod (32) and the rotating block (33) are provided with two groups, and the two linkage rods (32) are linked with the lever (31); The two rotating blocks (33) are arranged on the valve rods of the two control valves (22) respectively, when the valve rod rotates, the control valve (22) switches from the open state to the closed state.

4. A smooth starting pneumatic actuator according to claim 2, characterized in that: The lever (31) is provided with a positioning block (311), the actuator body (1) is provided with a positioning groove matched with the positioning block (311), and the positioning groove is provided with two groups, corresponding to the initial position and the position after rotation of the lever (31) respectively. When the gas is introduced into the actuator body (1) to move the linkage plate (12), the lever (31) is rotated from the position state one to the position state two, and at this time, the control valve (22) switches from the open state to the closed state; When the actuator body (1) is exhausted to the outside to reset the linkage plate (12), the lever (31) is rotated from the position state two to the position state one, and at this time, the control valve (22) switches from the closed state to the open state.

5. A smooth starting pneumatic actuator according to claim 2, characterized in that: One side of the actuator body (1) is provided with two air holes, and the compression tank (23) is communicated with the air holes through the connecting pipe (21).

6. A smooth starting pneumatic actuator according to claim 1, characterized in that: The compression tank (23) is provided with an adjustment mechanism (4), a mounting plate (5), a buffer spring (6) and a buffer plate (7). There are two sets of mounting plates (5), which are symmetrically distributed along the center of the compression tank (23). The two mounting plates (5) divide the inner cavity of the compression tank (23) into a first hydraulic chamber (24), an adjustment chamber (25) and a second hydraulic chamber (26). The adjustment mechanism (4) is located in the adjustment cavity (25), and both ends of the adjustment mechanism (4) are connected to the mounting plate (5). The adjustment mechanism (4) is used to synchronously adjust the distance between the mounting plate (5) and the center of the compression tank (23). The buffer plate (7) and the buffer spring (6) are provided in two sets, and are respectively installed in the first hydraulic chamber (24) and the second hydraulic chamber (26). One end of the buffer spring (6) abuts against the buffer plate (7), and the other end is installed on the mounting plate (5).

7. A smooth starting pneumatic actuator according to claim 6, characterized in that: The adjustment mechanism (4) includes an adjustment motor (41), a gear assembly (42), an adjustment screw (43), and an adjustment head (44). The adjustment motor (41) is linked to the adjustment screw (43) through the gear assembly (42). The adjusting screw (43) has reverse threaded portions at both ends, and the adjusting head (44) has two sets, which are respectively connected to the reverse threaded portions at both ends.

8. A smooth starting pneumatic actuator according to claim 7, characterized in that: The gear assembly (42) includes a drive gear (421), a reduction gear (422), and a transmission gear (423). The drive gear (421) is connected to the regulating motor (41). The reduction gear (422) is arranged in a "T" shape and meshes with the drive gear (421) and the transmission gear (423) respectively. The transmission gear (423) is mounted on the adjusting screw (43).

9. A smooth starting pneumatic actuator according to claim 8, characterized in that: The compression tank (23) is provided with a connecting frame (8), the reduction gear (422) is installed on the connecting frame (8), and the connecting frame (8) and the regulating motor (41) are respectively installed on both sides of the center of the compression tank (23).

10. A gentle start pneumatic actuator according to any one of claims 1 to 9, characterized by: The actuator body (1) is provided with auxiliary pipes (9) at both ends that are connected to the compression tank (23), and a one-way valve (91) is provided in the auxiliary pipe (9).

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