Piston actuator assembly

Abstract

The utility model belongs to the technical field of actuators, particularly relates to a piston actuator assembly, and aims to solve the problems that in the prior art, a pneumatic actuator has elasticity on a disc spring and an auxiliary piston, so that the opening degree of a control valve is not accurate enough, the valve cannot be manually controlled to be opened and closed under the condition of power failure or air failure, and the use is inconvenient. According to the technical scheme, the device comprises a shell, a rotating shaft is rotationally arranged in the shell through a bearing, two piston columns are arranged in the shell in a sliding mode, racks are fixedly arranged on the inner sides of the two piston columns, the outer wall of the rotating shaft is fixedly sleeved with gears meshed with the two racks, and sliding rods are arranged at the two ends of an end cover; and the position of the sliding rod can be controlled by rotating the inner thread sleeve rod, so that the sliding rod is matched with the piston column for use to control the opening and closing degree of the valve, and the inner thread sleeve rod can be rotated to control the opening and closing of the valve under the condition of power and gas interruption, so that the control is more accurate and the use is convenient.

Description

Technical Field

[0001] The utility model relates to the technical field of actuators, in particular to a piston actuator assembly. Background Art

[0002] Pneumatic actuators are used in hydraulic, air pressure, and mechanical transmission systems. They are usually composed of a piston, a piston rod, a cylinder, etc. They convert mechanical energy into air pressure through the piston, and can also convert it in the opposite direction. They have a wide range of applications and high transmission efficiency.

[0003] After searching, the utility model with announcement number CN 217784348 U discloses an adjustable multi-piston pneumatic actuator, including a main cylinder body, main end covers are installed on the left and right sides of the main cylinder body, and a sub-cylinder body is detachably connected to the outer side of the main end cover. A rotating shaft and a main piston meshing with the rotating shaft are provided in the main cylinder body, and a sub-piston and a sub-piston rod are provided in the sub-cylinder body. A mounting hole is opened in the middle of the main end cover, and an adjustment sleeve is installed in the mounting hole. One side of the adjustment sleeve is fixedly connected to a disc spring located in the main cylinder body and facing the piston. One end of the sub-piston rod passes through the adjustment sleeve and the disc spring in turn and extends into the main cylinder body. The piston moves outward to compress the disc spring first and then contact the sub-piston rod to push the sub-piston rod to move. In the above manner, the utility model adjustable multi-piston pneumatic actuator adjusts the reaction speed of the main piston through the disc spring and the distance between the sub-piston rod and the main piston, thereby controlling the valve opening speed and opening size to meet different usage requirements.

[0004] The starting actuator also has the following disadvantages during use: the disc spring is used to control the movement speed of the main piston, and the auxiliary piston and the disc spring can also jointly determine the movement stroke of the main piston, thereby controlling the valve opening speed and opening size to meet different usage requirements. However, the disc spring and the auxiliary piston are elastic, which makes the control of the valve opening size not precise enough, and in the event of power or gas failure, the valve cannot be manually controlled to open and close, which is inconvenient to use. Utility Model Content

[0005] The purpose of the utility model is to solve the shortcomings of the prior art that the pneumatic actuator has elasticity in the disc spring and the auxiliary piston, which makes the opening size of the control valve not precise enough, and in the event of power failure or gas failure, the valve opening and closing cannot be manually controlled, which is inconvenient to use, and a piston actuator assembly is proposed.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] A piston actuator assembly, comprising a housing, a rotating shaft rotatably provided inside the housing through a bearing, two piston columns slidably provided inside the housing, racks fixedly provided on the inner sides of the two piston columns, a gear meshing with the two racks fixedly provided on the outer wall of the rotating shaft, end covers fixedly provided at both ends of the housing, a first air inlet and outlet hole and a second air inlet and outlet hole for air inlet and outlet are provided on the housing, a sliding rod is penetrated on one side of the end cover, and the position of the sliding rod in the end cover can be adjusted, and the sliding rod is used in conjunction with the piston column to control the stroke of the piston column;

[0008] The limiting mechanism is arranged on the sliding rod and used in conjunction with the piston column to limit the piston column. At the same time, when the power is cut off and the gas is cut off, the position of the sliding rod can be adjusted to drive the piston column to move and control the rotation of the rotating shaft.

[0009] In a possible design, the limiting mechanism includes a first electromagnet block fixedly provided at one end of the sliding rod, and a second electromagnet block corresponding to the first electromagnet block is fixedly provided on one side of the piston column. When the first electromagnet block and the second electromagnet block are adsorbed, the piston column can be fixed on the sliding rod.

[0010] In a possible design, a rotating seat is fixedly provided on the outer side of the shell, an inner screw sleeve rod is rotatably provided through one side of the rotating seat, two screws are provided on the inner thread of the inner screw sleeve rod, and a connecting strip is fixedly provided between the corresponding screws and the sliding rod.

[0011] In a possible design, a plurality of guide rings are fixedly provided on the outer side of the piston column, a spring is provided inside the guide ring, and two ends of the spring are respectively fixedly connected to the piston column and the side of the end cover that are close to each other.

[0012] In a possible design, a sealing gasket is provided on the inner wall of the end cover, and the sliding rod is located in the sealing gasket for sealing between the end cover and the sliding rod.

[0013] In a possible design, the outer surface of the inner screw sleeve rod is provided with anti-slip grooves to increase the friction between the inner screw sleeve rod and the hand.

[0014] In the present application, when in use, the housing is mounted on the valve, and the rotating shaft is connected to the valve stem, and the housing is connected to the gas source. When the valve needs to be opened, the gas enters the housing through the first inlet and outlet holes, which can drive the two piston rods to move away from each other, and at the same time compress the spring. The movement of the piston rod can drive the gear to rotate through the rack, thereby driving the valve stem to rotate through the rotating shaft, so that the valve is opened;

[0015] When the valve needs to be closed, the flow direction of the gas source in the housing is switched. At this time, the piston column can be reset and moved under the action of the spring and the gas. The reset movement of the piston column can drive the rack to reset and move, and the gear can drive the rotating shaft to reset and rotate, thereby driving the valve to close;

[0016] When the opening and closing degree of the valve needs to be limited, the inner screw sleeve rod is rotated. The rotation of the inner screw sleeve rod can drive the two screws to move away from each other. The movement of the screw can drive the sliding rod to move through the connecting strip until the sliding rod moves to the set position. At this time, the external air source drives the piston column to move until the second electromagnet block on one side of the piston column conflicts with the first electromagnet block. At this time, the opening and closing size of the valve is the set size;

[0017] When the piston column needs to be fixed, the first electromagnet block and the second electromagnet block are started to fix the piston column on the sliding rod, so that when the power is cut off and the air is cut off, the piston column will not reset under the action of the spring, and the screw rod can be driven to move by rotating the inner screw sleeve rod, which can continue to drive the piston column to move and control the opening and closing of the valve.

[0018] In the utility model, the piston actuator assembly can drive the sliding rod to move on the end cover by rotating the inner screw sleeve rod, so that the piston column and the sliding rod can be used together to limit the opening and closing size of the valve, so that the opening and closing size of the valve can be accurately controlled, and the use is more convenient;

[0019] In the utility model, the piston actuator assembly can fix the piston column by arranging the second electromagnet block and the first electromagnet block between the sliding rod and the piston column, and can also control the opening and closing of the valve by rotating the inner screw sleeve rod when the power is cut off and the gas is cut off, thereby improving the flexibility of operation;

[0020] In the utility model, sliding rods are arranged at both ends of the end cover, and the position of the sliding rod can be controlled by rotating the inner screw sleeve rod, so that the opening and closing size of the valve can be controlled by using it in conjunction with the piston column, and the inner screw sleeve rod can also be rotated to control the opening and closing of the valve when the power is off and the gas is off, so that the control is more precise and convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional structural schematic diagram of the piston actuator assembly proposed in the utility model;

[0022] Figure 2 This is a cross-sectional structural diagram of the piston actuator assembly proposed by the utility model;

[0023] Figure 3 This is a schematic diagram of the installation position structure of the electromagnet block of the piston actuator assembly proposed by the utility model.

[0024] In the figure: 1, outer shell; 2, end cover; 3, rotating shaft; 4, first air inlet and outlet; 5, second air inlet and outlet; 6, rotating seat; 7, inner threaded sleeve rod; 8, screw rod; 9, connecting strip; 10, sliding rod; 11, bearing; 12, rack; 13, gear; 14, piston rod; 15, guide ring; 16, spring; 17, first electromagnet block; 18, second electromagnet block. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0026] Example 1

[0027] Reference Figure 1-Figure 3 , a piston actuator assembly, which is used in the field of actuators, comprises: a housing 1, a rotating shaft 3 is rotatably provided inside the housing 1 through a bearing 11, two piston rods 14 are slidably provided inside the housing 1, racks 12 are fixedly provided on the inner sides of the two piston rods 14, a gear 13 meshing with the two racks 12 is fixedly provided on the outer wall of the rotating shaft 3, end covers 2 are fixedly provided at both ends of the housing 1, a first air inlet and outlet hole 4 and a second air inlet and outlet hole 5 for air inlet and outlet are opened on the housing 1, a sliding rod 10 is penetrated on one side of the end cover 2, and the position of the sliding rod 10 in the end cover 2 can be adjusted, and the sliding rod 10 is used in conjunction with the piston rod 14 to control the stroke of the piston rod 14;

[0028] The limiting mechanism is arranged on the sliding rod 10 and used in conjunction with the piston column 14 to limit the piston column 14. At the same time, when the power is cut off and the gas is cut off, the position of the sliding rod 10 can be adjusted to drive the piston column 14 to move and control the rotation of the rotating shaft 3. By arranging a sliding rod 10 that can adjust the position in the end cover 2, the piston column 14 can be blocked by the sliding rod 10 during the movement, so that it can control the opening and closing size of the valve, and the piston column 14 can be limited by the limiting mechanism on the sliding rod 10, so that when the power is cut off and the gas is cut off, the piston column 14 can be driven to move by the sliding rod 10, so that the rotating shaft 3 can be rotated by manual control.

[0029] The limiting mechanism includes a first electromagnet block 17 fixedly arranged at one end of the sliding rod 10, and a second electromagnet block 18 corresponding to the first electromagnet block 17 is fixedly arranged on one side of the piston column 14. When the first electromagnet block 17 and the second electromagnet block 18 are adsorbed, the piston column 14 can be fixed on the sliding rod 10. By starting the first electromagnet block 17 and the second electromagnet block 18, the piston column 14 can be fixed on the sliding rod 10, so that when the power is cut off and the gas is cut off, the movement of the piston column 14 can be controlled by the sliding rod 10, so that the rotating shaft 3 rotates, which is convenient for manual control in an emergency. At the same time, the position of the sliding rod 10 can be limited by the first electromagnet block 17 to prevent the sliding rod 10 from detaching from the end cover 2.

[0030] A rotating seat 6 is fixedly provided on the outer side of the shell 1, and an inner screw sleeve rod 7 is rotatably provided on one side of the rotating seat 6. The inner thread of the inner screw sleeve rod 7 is provided with two screws 8, and a connecting strip 9 is fixedly provided between the corresponding screws 8 and the sliding rod 10. By rotating the inner screw sleeve rod 7, the two screws 8 can be driven to move relative to each other at the same time. During the movement of the screw 8, the sliding rod 10 can be driven to move in the end cover 2 through the connecting strip 9, so that it is easy to adjust, and when the piston column 14 and the sliding rod 10 are fixed, the rotating shaft 3 can be driven to rotate, and a motor can be arranged on the shell 1, and then the motor output shaft drives the inner screw sleeve rod 7 to rotate for electrical control.

[0031] Example 2

[0032] refer to Figure 1-Figure 3 , an improvement on Example 1: a plurality of guide rings 15 are fixedly provided on the outer side of the piston column 14, a spring 16 is provided inside the guide ring 15, and both ends of the spring 16 are fixedly connected to the piston column 14 and the side of the end cover 2 that are close to each other. By arranging a plurality of rotating seats 6 between the piston column 14 and the end cover 2, it is possible to cooperate with the gas to accelerate the reset movement of the piston column 14, improve the control accuracy, and guide the spring 16 through the guide ring 15 to avoid large bending of the spring 16 during the compression process.

[0033] The outer surface of the inner screw sleeve rod 7 is provided with anti-skid patterns to increase the friction between the inner screw sleeve rod 7 and the hand. By providing the anti-skid patterns on the outer wall of the inner screw sleeve rod 7, the friction between the inner screw sleeve rod 7 and the hand can be increased, making it easier to rotate the inner screw sleeve rod 7.

[0034] A sealing gasket is provided on the inner wall of the end cover 2, and the sliding rod 10 is located inside the sealing gasket, which is used to seal between the end cover 2 and the sliding rod 10. By providing a sealing gasket between the sliding rod 10 and the end cover 2, the sliding rod 10 and the end cover 2 can be sealed to avoid air leakage and affect the reset movement of the piston column 14.

[0035] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A piston actuator assembly, comprising a housing (1), wherein a rotating shaft (3) is rotatably provided inside the housing (1) via a bearing (11), wherein two piston rods (14) are slidably provided inside the housing (1), wherein racks (12) are fixedly provided on the inner sides of the two piston rods (14), wherein a gear (13) meshing with the two racks (12) is fixedly provided on the outer wall of the rotating shaft (3), wherein end covers (2) are fixedly provided at both ends of the housing (1), wherein a first air inlet and outlet hole (4) and a second air inlet and outlet hole (5) for air inlet and outlet are provided on the housing (1), wherein the housing (1) is characterized in that: A sliding rod (10) is provided through one side of the end cover (2), and the position of the sliding rod (10) inside the end cover (2) can be adjusted. The sliding rod (10) is used in conjunction with the piston column (14) to control the stroke of the piston column (14); The limiting mechanism is arranged on the sliding rod (10) and cooperates with the piston column (14) for limiting the position of the piston column (14). At the same time, when power is cut off or gas is cut off, the position of the sliding rod (10) is adjusted to drive the piston column (14) to move and control the rotation of the rotating shaft (3).

2. The piston actuator assembly according to claim 1, characterized in that: The limiting mechanism comprises a first electromagnet block (17) fixedly arranged at one end of the sliding rod (10), and a second electromagnet block (18) corresponding to the first electromagnet block (17) is fixedly arranged at one side of the piston column (14); when the first electromagnet block (17) and the second electromagnet block (18) are adsorbed, the piston column (14) can be fixed on the sliding rod (10).

3. The piston actuator assembly according to claim 1, characterized in that: A rotating seat (6) is fixedly provided on the outer side of the housing (1), an inner screw sleeve rod (7) is rotatably provided through one side of the rotating seat (6), two screw rods (8) are provided on the inner thread of the inner screw sleeve rod (7), and a connecting strip (9) is fixedly provided between the corresponding screw rods (8) and the sliding rod (10).

4. The piston actuator assembly according to claim 1, characterized in that: A plurality of guide rings (15) are fixedly provided on the outer side of the piston column (14), a spring (16) is provided inside the guide ring (15), and two ends of the spring (16) are respectively fixedly connected to the piston column (14) and the end cover (2) on the side close to each other.

5. The piston actuator assembly according to any one of claims 1 to 4, characterized in that: The inner wall of the end cover (2) is provided with a sealing gasket, and the sliding rod (10) is located inside the sealing gasket, which is used to seal between the end cover (2) and the sliding rod (10).

6. The piston actuator assembly according to claim 3, characterized in that: The outer surface of the inner screw sleeve rod (7) is provided with anti-skid patterns for increasing the friction between the inner screw sleeve rod (7) and the hand.

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