Double-cylinder double-acting pneumatic actuator

Abstract

The double-cylinder double-acting pneumatic actuator comprises a transmission assembly and air cylinders arranged on the two sides of the transmission assembly, each air cylinder is provided with a piston piece and an air inlet for controlling the piston piece to move, and the transmission assembly comprises an installation body, a transmission rod, a positioning rod, a sliding seat, an output shaft and a shifting fork piece. The two sets of air cylinders are installed on the two sides of the transmission assembly, and when one air cylinder is clamped or leaks air, the system is switched to the air cylinder on the other side to replace the air cylinder to work, so that normal operation of an equipment control system is kept, and paralysis of the control system directly caused by damage of the air cylinders is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of actuators, in particular to a double-cylinder double-acting pneumatic actuator. Background Art

[0002] The scotch yoke pneumatic actuator is a piston-type actuator, which usually includes a scotch yoke transmission part and a cylinder. The internal scotch yoke structure converts the linear motion of the cylinder into rotational motion. It is suitable for controlling the rotation opening or closing of valves such as ball valves, butterfly valves, and plug valves.

[0003] However, traditional scotch fork pneumatic actuators are usually equipped with only one cylinder as a power source. Once the cylinder fails, it cannot be used any further and can only be shut down for repairs. During the maintenance process, work progress is seriously affected, resulting in economic losses. Summary of the Invention

[0004] In order to overcome the shortcomings of the background technology, the technical solution adopted by the utility model is: a double-cylinder double-acting pneumatic actuator, including a transmission assembly, and cylinders arranged on both sides of the transmission assembly, the cylinders are provided with piston parts, and air inlets for controlling the movement of the piston parts, the transmission assembly includes a mounting body, a transmission rod, a positioning rod, a sliding seat, an output shaft and a fork part, the mounting body is slidingly connected to the transmission rod, the transmission rod passes through the cylinder and is fixedly connected to the piston part, the mounting body is fixedly connected to the positioning rod distributed parallel to the transmission rod, the transmission rod is provided with a sliding seat slidingly connected to the positioning rod, the mounting body is rotatably connected to the output shaft, one end of the fork part is fixedly connected to the output shaft, and the other end is movably connected to the sliding seat, and the cylinder controls the reciprocating rotation of the output shaft through the fork part.

[0005] Using the above technical solution, two groups of cylinders are installed on both sides of the transmission assembly. When one of the cylinders is stuck or leaking, the system switches to the cylinder on the other side to replace it, so as to maintain the normal operation of the equipment control system and avoid the paralysis of the control system directly due to cylinder damage.

[0006] The utility model is further configured such that the sliding seat is provided with threaded holes and movable holes which are parallel to each other, the transmission rod is threadedly connected to both ends of the sliding seat through the threaded holes, and the positioning rod is slidably connected to the movable holes through the shaft sleeve.

[0007] By adopting the above technical solution, the force of the fork member on the transmission rod in the rotation direction is offset by the limitation of the sliding seat, so that the transmission rod always moves parallel to the positioning rod, avoiding the transmission rod affecting the connection structure between the installation body and the cylinder.

[0008] The utility model is further configured such that the sliding seat is provided with a transfer rod at the threaded hole, the fork member is provided with a linear groove for accommodating the transfer rod, one end of the fork member is keyed to the output shaft, and the other end is movably connected to the transfer rod through the linear groove.

[0009] By adopting the above technical solution, when the piston drives the transmission rod to move back and forth laterally, the adapter rod on the sliding seat drives the plug-in part to rotate back and forth. The linear groove structure offsets the feed amount between the plug-in part and the adapter rod during rotation, so that the adapter rod moves back and forth along the linear groove, thereby realizing the rotation of the cylinder-controlled output shaft. The overall structure is simple and the transmission is stable.

[0010] The utility model is further configured such that mounting parts for connecting the cylinder are provided at both ends of the mounting body, the mounting parts are provided with mounting holes, the mounting body is threadedly connected to the cylinder through the mounting holes, upper side covers and lower side covers are provided on both sides of the mounting body, and the output shaft is rotatably connected to the upper side cover and the lower side cover through bearings.

[0011] Furthermore, the cylinder includes a cylinder body, an inner end cover and an outer end cover arranged at both ends of the cylinder body, and a piston member slidably connected to the cylinder body, the inner end cover and the outer end cover are both provided with the air inlet, the inner end cover is provided with a stud corresponding to the cylinder body, the mounting body is threadedly connected to the inner end cover through the mounting hole, and the inner end cover is provided with a positioning groove for positioning the mounting body.

[0012] Furthermore, the mounting body is provided with a through hole at the mounting portion, the inner end cover and the piston member are provided with an inner hole and a countersunk hole coaxially distributed with the through hole, and the transmission rod passes through the through hole, the inner hole and the countersunk hole in sequence and is threadedly connected to the piston member.

[0013] By adopting the above technical solution, when installing the cylinder, the mounting body is connected to the inner end cover of the cylinder through the positioning groove, and the stud passes through the mounting hole and the two are fixed by a nut, so that the positioning groove is coaxially distributed with the through hole, inner hole and countersunk hole, so that the transmission rod moves smoothly without jamming.

[0014] The utility model is further configured such that the inner hole is provided with a wear-resistant ring and a sealing ring, and the transmission rod is slidably connected to the inner end cover through the wear-resistant ring and the sealing ring.

[0015] By adopting the above technical solution, the sealing effect between the transmission rod and the inner end cover, the cylinder body and the piston part is improved by the sealing ring, the cylinder leakage is prevented, the transmission efficiency is improved, the wear resistance of the transmission part is increased by the alloy wear-resistant ring, and the service life of the actuator is extended.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] Two sets of cylinders are installed on both sides of the transmission assembly. When one of the cylinders is stuck or leaking, the system switches to the cylinder on the other side to replace it to maintain the normal operation of the equipment control system and avoid direct paralysis of the control system due to cylinder damage.

[0018] The embodiments of the present invention will be further described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional diagram of the utility model;

[0020] Figure 2 It is a cross-sectional view of the utility model;

[0021] Figure 3 For the utility model Figure 1 A partial enlarged view of the A-direction view;

[0022] Figure 4 For the utility model Figure 2 A partial enlarged view of the middle B direction view;

[0023] Among them: 1 - transmission assembly, 2 - cylinder, 3 - piston, 4 - mounting body, 5 - transmission rod, 6 - positioning rod, 7 - sliding seat, 8 - output shaft, 9 - fork, 11 - wear-resistant ring, 12 - sealing ring, 21 - cylinder body, 22 - inner end cover, 23 - outer end cover, 24 - stud, 25 - positioning groove, 26 - inner hole, 31 - countersunk hole, 41 - mounting part, 42 - mounting hole, 43 - upper side cover, 44 - lower side cover, 45 - through hole, 71 - threaded hole, 72 - movable hole, 73 - adapter rod, 100 - air inlet; DETAILED DESCRIPTION

[0024] like Figure 1 、 2 As shown, this embodiment provides a double-cylinder double-acting pneumatic actuator, including a transmission assembly 1, and a cylinder 2 arranged on both sides of the transmission assembly 1, the cylinder 2 is provided with a piston member 3, and an air inlet 100 for controlling the movement of the piston member 3, the transmission assembly 1 includes a mounting body 4, a transmission rod 5, a positioning rod 6, a sliding seat 7, an output shaft 8 and a fork member 9, the mounting body 4 is slidingly connected to the transmission rod 5, the transmission rod 5 passes through the cylinder 2 and is fixedly connected to the piston member 3, the mounting body 4 is fixedly connected to the positioning rod 6 distributed parallel to the transmission rod 5, the transmission rod 5 is provided with a sliding seat 7 slidingly connected to the positioning rod 6, the mounting body 4 is rotatably connected to the output shaft 8, one end of the fork member 9 is fixedly connected to the output shaft 8, and the other end is movably connected to the sliding seat 7, and the cylinder 2 controls the reciprocating rotation of the output shaft 8 through the fork member 9.

[0025] Combine Figure 3As shown, in this embodiment, the sliding seat 7 is provided with threaded holes 71 and movable holes 72 distributed parallel to each other, the transmission rod 5 is threadedly connected to the two ends of the sliding seat 7 through the threaded holes 71, the positioning rod 6 is slidably connected to the movable hole 72 through the shaft sleeve, the sliding seat 7 is provided with a transfer rod 73 at the threaded hole 71, and the fork member 9 is provided with a linear groove for accommodating the transfer rod 73. One end of the fork member 9 is keyed to the output shaft 8, and the other end is movably connected to the transfer rod 73 through a linear groove.

[0026] Combine Figure 1 、 3 As shown in Figure 4, in this embodiment, mounting portions 41 for connecting to the cylinder 2 are provided at both ends of the mounting body 4, and the mounting portions 41 are provided with mounting holes 42. The mounting body 4 is threadedly connected to the cylinder 2 through the mounting holes 42. An upper side cover 43 and a lower side cover 44 are provided on both sides of the mounting body 4. The output shaft 8 is rotatably connected to the upper side cover 43 and the lower side cover 44 through a bearing. The cylinder 2 includes a cylinder body 21, and an inner end cover 22 and an outer end cover 23 provided at both ends of the cylinder body 21, and a piston member 3 slidably connected to the cylinder body 21. The inner end cover 22 and the outer end cover 23 are both provided with an air inlet 100, and the inner end cover 22 is provided with a There is a stud 24 corresponding to the cylinder body 21, the mounting body 4 is threadedly connected to the inner end cover 22 through the mounting hole 42, and the inner end cover 22 is provided with a positioning groove 25 for positioning the mounting body 4, the mounting body 4 is located at the mounting portion 41 and is provided with a through hole 45, the inner end cover 22 and the piston member 3 are provided with an inner hole 26 and a countersunk hole 31 coaxially distributed with the through hole 45, the transmission rod 5 is threadedly connected to the piston member 3 through the through hole 45, the inner hole 26 and the countersunk hole 31 in sequence, the inner hole 26 is provided with a wear-resistant ring 11 and a sealing ring 12, and the transmission rod 5 is slidably connected to the inner end cover 22 through the wear-resistant ring 11 and the sealing ring 12.

[0027] The working principle of the present utility model is that the air inlets at both ends of the cylinder 2 are connected to an air pump to form a circuit, and the air source enters or flows out of the cylinder 2 from the air inlet 100, so that the piston member 3 drives the transmission rod 5 to move back and forth laterally in the cylinder 2, and the adapter rod 73 on the sliding seat 7 drives the fork member 9 to rotate back and forth, thereby realizing the reciprocating rotation of the output shaft 8 controlled by the cylinder 2. During the transmission control period, when one of the cylinders 2 is stuck or leaking, the system switches to the cylinder 2 on the other side to replace it to maintain the normal operation of the equipment control system.

[0028] In addition to the above embodiments, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection required by the present invention.

Claims

1. A double-cylinder double-acting pneumatic actuator, characterized in that: The invention comprises a transmission assembly (1) and a cylinder (2) arranged on both sides of the transmission assembly (1). The cylinder (2) is provided with a piston member (3) and an air inlet (100) for controlling the movement of the piston member (3). The transmission assembly (1) comprises a mounting body (4), a transmission rod (5), a positioning rod (6), a sliding seat (7), an output shaft (8) and a shift fork member (9). The mounting body (4) is slidably connected to the transmission rod (5). The transmission rod (5) passes through the cylinder (2) and is fixedly connected to the piston member (3). The mounting body (4) is fixedly connected to the positioning rod (6) distributed parallel to the transmission rod (5). The transmission rod (5) is provided with a sliding seat (7) slidably connected to the positioning rod (6). The mounting body (4) is rotatably connected to the output shaft (8). One end of the shift fork member (9) is fixedly connected to the output shaft (8) and the other end is movably connected to the sliding seat (7). The cylinder (2) controls the reciprocating rotation of the output shaft (8) through the shift fork member (9).

2. A double-cylinder double-acting pneumatic actuator according to claim 1, characterized in that: The sliding seat (7) is provided with threaded holes (71) and moving holes (72) that are distributed parallel to each other. The transmission rod (5) is threadedly connected to the two ends of the sliding seat (7) through the threaded holes (71), and the positioning rod (6) is slidably connected to the moving hole (72) through a shaft sleeve.

3. A double-cylinder double-acting pneumatic actuator according to claim 2, characterized in that: The sliding seat (7) is provided with a transfer rod (73) at the threaded hole (71), and the fork member (9) is provided with a linear groove for accommodating the transfer rod (73). One end of the fork member (9) is key-connected to the output shaft (8), and the other end is movably connected to the transfer rod (73) through the linear groove.

4. The double-cylinder double-acting pneumatic actuator according to claim 1, characterized in that: Both ends of the mounting body (4) are provided with mounting portions (41) for connecting to the cylinder (2), the mounting portions (41) are provided with mounting holes (42), the mounting body (4) is threadedly connected to the cylinder (2) through the mounting holes (42), and both sides of the mounting body (4) are provided with an upper side cover (43) and a lower side cover (44), and the output shaft (8) is rotatably connected to the upper side cover (43) and the lower side cover (44) through a bearing.

5. The double-cylinder double-acting pneumatic actuator according to claim 4, characterized in that: The cylinder (2) comprises a cylinder body (21), an inner end cover (22) and an outer end cover (23) provided at both ends of the cylinder body (21), and a piston member (3) slidably connected to the cylinder body (21), the inner end cover (22) and the outer end cover (23) both being provided with the air inlet (100), the inner end cover (22) being provided with a stud (24) corresponding to the mounting hole (42), the mounting body (4) being threadedly connected to the inner end cover (22) through the mounting hole (42), and the inner end cover (22) being provided with a positioning groove (25) for positioning the mounting body (4).

6. The double-cylinder double-acting pneumatic actuator according to claim 5, characterized in that: The mounting body (4) is provided with a through hole (45) at the mounting portion (41); the inner end cover (22) and the piston member (3) are provided with an inner hole (26) and a countersunk hole (31) coaxially distributed with the through hole (45); the transmission rod (5) passes through the through hole (45), the inner hole (26) and the countersunk hole (31) in sequence and is threadedly connected to the piston member (3).

7. The double-cylinder double-acting pneumatic actuator according to claim 6, characterized in that: The inner hole (26) is provided with a wear-resistant ring (11) and a sealing ring (12), and the transmission rod (5) is slidably connected to the inner end cover (22) through the wear-resistant ring (11) and the sealing ring (12).

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