Air buffering device at tail end of angular travel actuating mechanism

Abstract

The invention discloses a tail end air buffering device of an angular travel executing mechanism, and relates to the technical field of executing mechanisms, the buffering device comprises a main body part, an air inlet channel and an air outlet channel, the main body part is internally provided with a mounting cavity, and the main body part is provided with the air inlet channel and the air outlet channel which are communicated with the mounting cavity; the valve core is rotatably mounted in the mounting cavity; the angular travel executing mechanism comprises an angular travel air cylinder and an electromagnetic valve, the main body part is installed on the angular travel air cylinder, the air inlet channel is communicated with the air outlet end of the electromagnetic valve, and the valve element is connected with a rotating shaft of the angular travel air cylinder; the valve element and the rotating shaft can rotate synchronously so as to change the conduction area between the air inlet channel and the exhaust channel. The structure is simple, the valve element is driven to rotate through rotation of the rotating shaft of the angular travel air cylinder when the angular travel air cylinder is switched on and off, so that the gas displacement is adjusted, tail end gas buffering is achieved when an executing mechanism is switched on and off, safety is good, and reliability is high.

Description

Technical Field

[0001] The present application relates to the technical field of actuators, and in particular to an end gas buffer device of an angular stroke actuator. Background Art

[0002] Most of the existing pneumatic angular stroke actuator products on the market do not have the end buffering function, which causes the actuator to have too much impact at the end of the rapid switch, which not only affects the service life of the actuator, but also affects the life of the valve driven by the actuator. There are currently two main ways to solve this kind of problem. One is to install a damper externally, and the other is to install a throttle valve externally. However, both methods have problems such as short life, high failure rate, complex circuits, and poor reliability. This is mainly because the first damper buffering method is also a hard-hitting method, and the life is not guaranteed; the second throttle valve method has complex piping, requires more accessories to be installed, increases failure points, and has poor reliability. Summary of the invention

[0003] The present application provides an air buffer device at the end of an angular stroke actuator, aiming to solve the problem that the buffer method of the existing actuator has a complex structure and poor reliability.

[0004] The present application provides an air buffer device at the end of an angular stroke actuator, which is installed outside the angular stroke actuator, and the buffer device includes: A main body, wherein a mounting cavity is provided inside, and an air inlet passage and an air exhaust passage communicating with the mounting cavity are opened on the main body; A valve core is rotatably installed in the installation cavity; The angular stroke actuator comprises an angular stroke cylinder and a solenoid valve, wherein the solenoid valve is connected to the angular stroke cylinder and is used to control the rotation of the rotating shaft of the angular stroke cylinder; The main body is installed on the angular stroke cylinder, the air inlet channel is connected to the air outlet end of the solenoid valve, the valve core is connected to the rotating shaft and can rotate synchronously with the rotating shaft; the valve core changes the conduction area between the air inlet channel and the exhaust channel through rotation to adjust the flow rate of the exhaust gas from the solenoid valve.

[0005] Optionally, the air inlet channel includes an air inlet, the exhaust channel includes a main exhaust port and an auxiliary exhaust port, the air inlet and the main exhaust port are respectively communicated with the installation cavity, and the auxiliary exhaust port is directly communicated with the air inlet; An air passage is arranged inside the valve core; the main exhaust port and the air inlet port are connected by the air passage or isolated by the valve core through the rotation of the valve core, so that the gas in the air inlet port is discharged through the main exhaust port and the auxiliary exhaust port together, or is discharged only through the auxiliary exhaust port.

[0006] Optionally, the buffer device includes a first state, a second state and a third state; In the first state, the valve core rotates within a first angle range, and an end of the air inlet close to the installation cavity is completely connected to the air passage; In the second state, the valve core rotates within a second angle range, and one end of the air inlet close to the installation cavity is partially closed by the valve core and partially communicated with the air passage; In the third state, the valve core rotates within a third angle range, and one end of the air inlet close to the installation cavity is completely closed by the valve core.

[0007] Optionally, the air inlet comprises a first air inlet and a second air inlet, the first air inlet is communicated with a first air outlet end of the solenoid valve, and the second air inlet is communicated with a second air outlet end of the solenoid valve; The auxiliary exhaust port includes a first exhaust port and a second exhaust port, the first exhaust port is communicated with the first air inlet, and the second exhaust port is communicated with the second air inlet.

[0008] Optionally, a cross-sectional area of ​​the auxiliary exhaust port is smaller than a cross-sectional area of ​​the main exhaust port.

[0009] Optionally, a throttle valve is provided at the auxiliary exhaust port.

[0010] Optionally, a guide sleeve is provided inside the installation cavity, and the valve core is installed inside the guide sleeve and can rotate relative to the guide sleeve.

[0011] Optionally, a cylinder connecting plate is provided at one end of the valve core, the cylinder connecting plate is connected to the valve core, and the rotating shaft of the angular stroke cylinder is connected to the cylinder connecting plate.

[0012] Optionally, a sensing element is further provided at one end of the valve core away from the cylinder connecting plate, and the sensing element is connected to the valve core; a sensor is provided on the angular stroke cylinder, and the sensor is connected to the sensing element for obtaining the rotation angle of the valve core according to the position of the sensing element.

[0013] Optionally, a sealing member is provided at the connection between the valve core and the main body.

[0014] Beneficial effects: The present application provides an end gas buffer device of an angular stroke actuator, which is installed on the outside of the angular stroke actuator, and includes: a main body, an installation cavity is arranged inside, and an air inlet channel and an exhaust channel communicating with the installation cavity are opened on the main body; a valve core is rotatably installed in the installation cavity; the angular stroke actuator includes an angular stroke cylinder and a solenoid valve, and the solenoid valve is connected to the angular stroke cylinder to control the rotation of the rotating shaft of the angular stroke cylinder; the main body is installed on the angular stroke cylinder, the air inlet channel is communicated with the air outlet end of the solenoid valve, and the valve core is connected to the rotating shaft and can rotate synchronously with the rotating shaft; the valve core changes the conduction area between the air inlet channel and the exhaust channel through rotation to adjust the flow rate of the exhaust gas of the solenoid valve. The present application utilizes the rotation of the rotating shaft itself when the angular stroke cylinder switches to drive the valve core to rotate synchronously, and controls the conduction area between the air inlet channel and the exhaust channel through the rotation of the valve core, thereby adjusting the exhaust volume and exhaust speed, and realizing the end gas buffer effect, with a simple overall structure, convenient installation, high safety and good reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0016] Figure 1 This is a gas circuit schematic diagram of the connection between the end gas buffer device of the angular stroke actuator and the angular stroke cylinder and the solenoid valve proposed in one embodiment of the present application; Figure 2 It is a three-dimensional structural schematic diagram of an end gas buffer device of an angular stroke actuator proposed in an embodiment of the present application; Figure 3 This application Figure 2 Front view of the air cushion device at the end of the medium angle stroke actuator; Figure 4 This application Figure 3 AA section view of the air cushion device at the end of the medium-angle stroke actuator; Figure 5 This application Figure 2 Side view of the gas cushion device at the end of the medium-angle stroke actuator; Figure 6 This application Figure 5 BB section view of the air cushion device at the end of the medium-angle stroke actuator; Figure 7This is a schematic diagram of the end gas buffer device of the angular stroke actuator proposed in an embodiment of the present application, in which the valve core is in the first position during the opening process of the angular stroke cylinder; Figure 8 This is a schematic diagram of the end gas buffer device of the angular stroke actuator proposed in an embodiment of the present application, in which the valve core is in the second position during the opening process of the angular stroke cylinder; Fig. 9 This is a schematic diagram of the end gas buffer device of the angular stroke actuator proposed in one embodiment of the present application, in which the valve core is in the third position during the opening process of the angular stroke cylinder; Fig.10 This is a schematic diagram of the end gas buffer device of the angular stroke actuator proposed in one embodiment of the present application, in which the valve core is in the fourth position during the opening process of the angular stroke cylinder; Fig.11 This is a schematic diagram of the end gas buffer device of the angular stroke actuator proposed in an embodiment of the present application, in which the valve core is in the first position during the closing process of the angular stroke cylinder; Fig.12 This is a schematic diagram of the end gas buffer device of the angular stroke actuator proposed in one embodiment of the present application, in which the valve core is in the second position during the closing process of the angular stroke cylinder; Fig.13 This is a schematic diagram of the end gas buffer device of the angular stroke actuator proposed in an embodiment of the present application, in which the valve core is in the third position during the closing process of the angular stroke cylinder; Fig.14 This is a schematic diagram of the end gas buffer device of the angular stroke actuator proposed in an embodiment of the present application, in which the valve core is in the fourth position during the closing process of the angular stroke cylinder.

[0017] Description of reference numerals: 1. Main body; 2. Valve core; 3. First air inlet; 4. Second air inlet; 5. Main exhaust port; 6. First exhaust port; 7. Second exhaust port; 8. Guide sleeve; 9. Seal; 10. End cover; 11. First fastener; 12. Induction element; 13. Second fastener; 14. Cylinder connecting plate; 15. Valve core reinforcement plate; 16. Third fastener; 17. Main body connecting hole; 18. Cylinder; 19. Rotating shaft; 20. Solenoid valve. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] In the related technology, most pneumatic angular stroke actuator products do not have the end buffering function, which causes the actuator to have too much impact at the end of the rapid switch, which not only affects the service life of the actuator, but also affects the life of the valve driven by the actuator. There are currently two main methods to solve this type of problem. One is to install a damper externally, and the other is to install a throttle valve externally. However, both methods have problems such as short life, high failure rate, complex circuits, and poor reliability. This is mainly because the first damper buffering method is also a hard-hitting method, and the life is not guaranteed; the second throttle valve method has complex piping, requires more accessories to be installed, increases failure points, and has poor reliability.

[0020] In view of this, an embodiment of the present application proposes an end gas cushioning device of an angular stroke actuator.

[0021] See also Figure 1 and Figure 2 A gas buffer device at the end of an angular stroke actuator is installed on the outside of the angular stroke actuator. The buffer device includes: a main body 1, which is provided with a mounting cavity inside, and the main body 1 is provided with an air inlet channel and an exhaust channel connected to the mounting cavity; a valve core 2, which is rotatably installed in the mounting cavity.

[0022] The angular stroke actuator includes an angular stroke cylinder 18 and a solenoid valve 20 . The solenoid valve 20 is connected to the angular stroke cylinder 18 and is used to control the rotation of a rotating shaft 19 of the angular stroke cylinder 18 .

[0023] The main body 1 is installed on the angular stroke cylinder 18, the air inlet channel is connected to the air outlet end of the solenoid valve 20, and the valve core 2 is connected to the rotating shaft 19 of the angular stroke cylinder 18 and can rotate synchronously with the rotating shaft 19; the valve core 2 changes the conduction area between the air inlet channel and the exhaust channel through rotation to adjust the flow rate of the exhaust gas of the solenoid valve 20.

[0024] Specifically, the angular stroke actuator includes an angular stroke cylinder 18 and a solenoid valve 20. The solenoid valve 20 controls the air intake and exhaust directions of the angular stroke cylinder 18 by gaining and losing electricity, thereby controlling the switching action of the angular stroke cylinder 18. In the process of opening or closing the angular stroke cylinder 18, the rotating shaft 19 rotates forward or reversely, and the speed of the rotating shaft 19 rotation is affected by the exhaust speed. When the flow rate of the exhaust gas from the solenoid valve 20 is large, the exhaust speed is fast, and the rotating shaft 19 rotates fast. When the flow rate of the exhaust gas from the solenoid valve 20 is small, the exhaust speed is slow, and the rotating shaft 19 rotates slowly. The buffer device described in this embodiment is installed on the outside of the angular stroke actuator, and includes a main body 1 and a valve core 2, wherein the main body 1 is connected and fixed to the cylinder body of the angular stroke cylinder 18, a cylindrical installation cavity is arranged in the main body 1, and an air inlet channel and an exhaust channel communicating with the installation cavity are opened, the air inlet channel is connected to the air outlet end of the solenoid valve 20, so that the gas exhausted from the solenoid valve 20 can enter the buffer device through the air inlet channel; the valve core 2 is rotatably installed inside the installation cavity, and the valve core 2 is coaxially connected to the rotating shaft 19 of the angular stroke cylinder 18. When the solenoid valve 20 controls the angular stroke cylinder 18 to perform a switching action, the rotating shaft 19 of the angular stroke cylinder 18 rotates, which can drive the valve core 2 to rotate synchronously, and the valve core 2 can change the conduction area between the air inlet channel and the exhaust channel by rotating in the installation cavity, thereby changing the flow rate of the exhaust gas of the solenoid valve 20, and the change in the exhaust gas flow rate in turn affects the action of the angular stroke cylinder 18, so that the rotation speed of the rotating shaft 19 changes. Specifically, taking the opening action of the angular stroke cylinder 18 as an example, the rotating shaft 19 of the cylinder 18 rotates from the initial position to the maximum stroke position. During the process of the valve core 2 rotating synchronously with the rotating shaft 19, the conduction area between the intake channel and the exhaust channel is reduced, so that the flow rate of the exhaust gas of the solenoid valve 20 is reduced, the exhaust speed is slowed down, and then the movement speed of the rotating shaft 19 of the cylinder 18 is slowed down, thereby achieving the end gas buffering effect.

[0025] Optionally, the air intake passage includes an air intake port, the exhaust passage includes a main exhaust port 5 and an auxiliary exhaust port, the air intake port and the main exhaust port 5 are respectively connected to the installation cavity, and the auxiliary exhaust port is directly connected to the air intake port.

[0026] An air passage is arranged inside the valve core 2; the main exhaust port 5 and the air inlet are connected by the air passage or isolated by the valve core 2 through the rotation of the valve core 2, so that the gas in the air inlet is discharged through the main exhaust port 5 and the auxiliary exhaust port together, or only through the auxiliary exhaust port.

[0027] Specifically, in this embodiment, the air inlet channel includes an air inlet, and the exhaust channel includes a main exhaust port 5 and an auxiliary exhaust port, wherein the auxiliary exhaust port is directly connected to the air inlet, and the main exhaust port 5 and the air inlet are controlled by the rotation of the valve core 2 to control the on-off state. Specifically, an airway is provided inside the valve core 2, and when the valve core 2 rotates in the installation cavity, the position of the airway also changes accordingly. When the valve core 2 rotates to certain positions, the main exhaust port 5 and the air inlet can be connected by the airway, so that after the gas discharged by the solenoid valve 20 enters the air inlet of the buffer device, a part can be discharged from the auxiliary exhaust port, and the other part can be discharged from the main exhaust port 5; when the valve core 2 rotates to other positions, the main exhaust port 5 and the air inlet are separated by the valve core 2, and after the gas discharged by the solenoid valve 20 enters the air inlet of the buffer device, it cannot enter the main exhaust port 5, and can only be discharged through the auxiliary exhaust port, and the exhaust speed is relatively slower, and thus the movement speed of the rotating shaft 19 of the angular stroke cylinder 18 will also be slower.

[0028] Optionally, the air inlet includes a first air inlet 3 and a second air inlet 4, the first air inlet 3 is connected to the first air outlet end of the solenoid valve 20, and the second air inlet 4 is connected to the second air outlet end of the solenoid valve 20; the auxiliary exhaust port includes a first exhaust port 6 and a second exhaust port 7, the first exhaust port 6 is connected to the first air inlet 3, and the second exhaust port 7 is connected to the second air inlet 4.

[0029] Specifically, the solenoid valve 20 generally includes two air outlets, namely a first air outlet and a second air outlet, which are used to exhaust air when the angular stroke cylinder 18 is opened and closed. In order to better adapt to it, in this embodiment, the air inlet of the buffer device includes a first air inlet 3 and a second air inlet 4, see Figure 1 and Figure 4 The first air inlet 3 and the second air inlet 4 are arranged opposite to each other and symmetrically distributed on both sides of the main exhaust port 5. The first air inlet 3 is connected to the first air outlet end of the solenoid valve 20, and the second air inlet 4 is connected to the second air outlet end of the solenoid valve 20; the auxiliary exhaust port includes a first exhaust port 6 and a second exhaust port 7. The first air inlet 3 and the second air inlet 4 are also arranged symmetrically and distributed on both sides of the main exhaust port 5. The first exhaust port 6 is directly connected to the first air inlet 3, and the second exhaust port 7 is directly connected to the second air inlet 4. Figure 1 During the opening process of the angular stroke cylinder 18, the gas source enters the second end of the cylinder 18 through the solenoid valve 20, and the gas at the first end of the cylinder 18 enters the first air inlet 3 of the buffer device through the first air outlet end of the solenoid valve 20; during the closing process of the angular stroke cylinder 18, the gas source enters the first end of the cylinder 18 through the solenoid valve 20, and the gas at the second end of the cylinder 18 enters the second air inlet 4 of the buffer device through the second air outlet end of the solenoid valve 20.

[0030] Optionally, a one-way valve is provided between the air inlet and the air outlet of the solenoid valve 20 .

[0031] Specifically, in the present embodiment, a first one-way valve is provided between the first air inlet 3 and the first air outlet end of the solenoid valve 20, and a second one-way valve is provided between the second air inlet 4 and the second air outlet end of the solenoid valve 20. By providing the first one-way valve and the second one-way valve, the gas can be restricted to flow from the solenoid valve 20 to the buffer device, thereby avoiding gas backflow and ensuring that the solenoid valve 20 can exhaust normally.

[0032] Optionally, the buffer device includes a first state, a second state and a third state; in the first state, the valve core 2 rotates within a first angle range, and the end of the air inlet close to the installation cavity is completely connected with the air channel; in the second state, the valve core 2 rotates within a second angle range, and the end of the air inlet close to the installation cavity is partially closed by the valve core 2 and partially connected with the air channel; in the third state, the valve core 2 rotates within a third angle range, and the end of the air inlet close to the installation cavity is completely closed by the valve core 2.

[0033] Specifically, due to the different rotation positions of the valve core 2 in the installation cavity, the conduction state and conduction area between the air inlet channel and the air outlet channel are different, so that the buffer device has three different states. In this embodiment, the exhaust channel includes a main exhaust port 5 and an auxiliary exhaust port, wherein the auxiliary exhaust port is always directly connected to the air inlet, and the rotation of the valve core 2 only affects the on-off state between the main exhaust port 5 and the air inlet. In the first state, the valve core 2 rotates within the first angle range, during which the end of the air inlet near the mounting cavity is always completely connected to the airway, and then the air inlet is completely connected to the main exhaust port 5. At this time, the air inlet channel and the exhaust channel are in a fully connected state, and the connection area is the largest; in the second state, the valve core 2 rotates within the second angle range, during which the valve core 2 gradually blocks the end of the air inlet near the mounting cavity, so that the end of the air inlet near the mounting cavity can only partially connect with the airway, and then the air inlet is partially connected to the main exhaust port 5. At this time, the air inlet channel and the exhaust channel are in a partially connected state, and the connection area gradually decreases with the rotation of the valve core 2; in the third state, the valve core 2 rotates within the third angle range, during which the valve core 2 completely closes the end of the air inlet near the mounting cavity, so that the air inlet and the airway are completely isolated, the air inlet cannot be connected to the main exhaust port 5, but is only connected to the auxiliary exhaust port. At this time, the air inlet channel and the exhaust channel are in a partially connected state, and the connection area is the smallest.

[0034] The switching process of the angular stroke cylinder 18 will be described in detail below.

[0035] Figure 7-Figure 10 The figure shows the rotation process of the valve core 2 during the opening process of the angular stroke cylinder 18. Figure 11-Figure 14 The figure shows the rotation process of the valve core 2 during the closing process of the angular stroke cylinder 18, with the M position shown in the figure as the initial position of the shaft 19 when the angular stroke cylinder 18 is not started, and the N position shown in the figure as the target position to which the shaft 19 rotates after the angular stroke cylinder 18 is started. During the opening process of the angular stroke cylinder 18, the valve core 2 rotates synchronously from the M position to the N position along the counterclockwise direction following the shaft 19, and the gas discharged from the solenoid valve 20 enters the first air inlet 3 of the buffer device; during the closing process of the angular stroke cylinder 18, the valve core 2 rotates clockwise from the N position to the M position following the shaft 19 to reset, and the gas discharged from the solenoid valve 20 enters the second air inlet 4 of the buffer device.

[0036] During the opening process of the angular stroke cylinder 18, the rotation of the valve core 2 can be divided into three stages, corresponding to the three states of the buffer device.

[0037] In the first stage, the valve core 2 rotates counterclockwise from the first position to the second position by an angle A1, and this process corresponds to the first state of the buffer device. Figure 7 , the angular stroke cylinder 18 has not started to move, the shaft 19 and the valve core 2 are both in the first position, that is, the M position in the figure, the right end of the first air inlet 3 is completely connected with the airway, and the gas entering the first air inlet 3 can be discharged through the first exhaust port 6 and the main exhaust port 5. Figure 8 , the valve core 2 rotates to the second position, at which time the right end of the first air inlet 3 is still completely connected to the airway. During the above rotation process, the right end of the first air inlet 3 always remains completely connected to the airway, and the gas entering the first air inlet 3 can be discharged through the first exhaust port 6 and the main exhaust port 5. The buffer device is in the first state, the conduction area between the air inlet channel and the exhaust channel is the largest, the exhaust volume is large, the exhaust speed is fast, and the action speed of the angular stroke cylinder 18 is fast.

[0038] In the second stage, the valve core 2 continues to rotate counterclockwise from the second position by an angle (B1-A1) to the third position. This process corresponds to the second state of the buffer device. Figure 8-Figure 9 In the process of the valve core 2 rotating from the second position to the third position, as the valve core 2 rotates, the right end of the first air inlet 3 is gradually blocked by the valve core 2, and the right end of the first air inlet 3 is only partially connected to the airway, and the connection area gradually decreases, and then the amount of gas discharged through the main exhaust port 5 also gradually decreases. The buffer device is in the second state, the exhaust volume decreases as the connection area decreases, the exhaust speed gradually slows down, and the action speed of the angular stroke cylinder 18 also gradually slows down. See Fig. 9 When the valve core 2 rotates to the third position, the right end of the first air inlet 3 is just completely closed by the valve core 2, and the angle between the third position and the first position is angle B1.

[0039] In the third stage, the valve core 2 continues to rotate counterclockwise from the third position by an angle (C1-B1) to reach the fourth position. This process corresponds to the third state of the buffer device. Fig.10 , the valve core 2 reaches the fourth position, i.e., position N in the figure, the right end of the first air inlet 3 is still completely closed by the valve core 2, and the angle between the fourth position and the first position is angle C1. During the above rotation process, the right end of the first air inlet 3 is always completely closed by the valve core 2, the first air inlet 3 is not connected to the main exhaust port 5, the buffer device is in the third state, and the gas is only discharged through the first exhaust port 6, the exhaust volume is small, and the exhaust speed is slow, so the action speed of the angular stroke cylinder 18 is slow, achieving the end gas buffer effect during the opening action.

[0040] Similarly, during the closing process of the angular stroke cylinder 18, the rotation of the valve core 2 can still be divided into three stages, which correspond to the three states of the buffer device respectively.

[0041] In the first stage, the valve core 2 rotates clockwise from the first position to the second position by an angle A2, and this process corresponds to the first state of the buffer device. Fig.11 , the angular stroke cylinder 18 is not closed, the shaft 19 and the valve core 2 are both in the first position, i.e., position N in the figure. At this time, the left end of the second air inlet 4 is completely connected with the airway, and the gas entering the second air inlet 4 can be discharged through the second exhaust port 7 and the main exhaust port 5. With the action of the angular stroke cylinder 18, the valve core 2 rotates to the second position, such as Fig.12 As shown, the left end of the second air inlet 4 is still completely connected to the airway. During the above rotation process, the left end of the second air inlet 4 always remains completely connected to the airway, and the gas entering the second air inlet 4 is discharged through the second exhaust port 7 and the main exhaust port 5. The buffer device is in the first state, the conduction area between the air inlet channel and the exhaust channel is the largest, the exhaust volume is large, the exhaust speed is fast, and the action speed of the angular stroke cylinder 18 is fast.

[0042] In the second stage, the valve core 2 rotates clockwise from the second position to the third position by an angle (B2-A2). This process corresponds to the second state of the buffer device. Figure 12-13 In the process of the valve core 2 rotating from the second position to the third position, as the valve core 2 rotates, the left end of the second air inlet 4 is gradually blocked by the valve core 2, and the left end of the second air inlet 4 is only partially connected to the airway, and the connection area gradually decreases. The amount of gas discharged through the main exhaust port 5 gradually decreases, and the buffer device is in the second state. The exhaust volume decreases as the connection area decreases, the exhaust speed gradually slows down, and the action speed of the angular stroke cylinder 18 also gradually slows down. See Fig.13 When the valve core 2 reaches the third position, the left end of the second air inlet 4 is just completely closed by the valve core 2, and the angle between the third position and the first position is angle B2.

[0043] In the third stage, the valve core 2 rotates clockwise from the third position to the fourth position by an angle (C2-B2). This process corresponds to the third state of the buffer device. Fig.14 , when the valve core 2 reaches the fourth position, i.e., the M position in the figure, the left end of the second air inlet 4 is still completely closed by the valve core 2, and the angle between the fourth position and the first position is angle C2. During the above rotation process, the left end of the second air inlet 4 is always completely closed by the valve core 2, the second air inlet 4 is not connected to the main exhaust port 5, the buffer device is in the third state, and the gas is only discharged through the second exhaust port 7, the exhaust volume is small, and the exhaust speed is slow, so the action speed of the angular stroke cylinder 18 is slow, and the end gas buffer effect during the closing action is achieved.

[0044] Optionally, the cross-sectional area of ​​the auxiliary exhaust port is smaller than the cross-sectional area of ​​the main exhaust port 5 .

[0045] Specifically, in the present embodiment, the cross-sectional areas of the first exhaust port 6 and the second exhaust port 7 are both smaller than the cross-sectional area of ​​the main exhaust port 5, so that when the buffer device is in the third state, that is, when exhaust is only discharged through the first exhaust port 6 or the second exhaust port 7, the exhaust volume is greatly reduced, thereby ensuring a slow exhaust speed and further improving the buffering effect.

[0046] Optionally, a throttle valve is provided at the auxiliary exhaust port.

[0047] Specifically, in this embodiment, a throttle valve can be provided at both the first exhaust port 6 and the second exhaust port 7, and the flow rate of the exhaust gas can be further fine-tuned through the throttle valve, thereby more accurately controlling the exhaust speed and the rotation speed of the angular stroke cylinder 18.

[0048] Optionally, a guide sleeve 8 is provided inside the installation cavity, and the valve core 2 is installed inside the guide sleeve 8 and can rotate relative to the guide sleeve 8 .

[0049] Specifically, the guide sleeve 8 is annular in shape, and is relatively fixedly embedded in the inner side of the installation cavity. The valve core 2 is installed inside the guide sleeve 8 and can rotate relative to the guide sleeve 8. By providing the guide sleeve 8, the rotation of the valve core 2 can be guided to prevent the valve core 2 from shaking in the installation cavity, reduce the friction between the valve core 2 and the main body 1, ensure the smooth rotation of the valve core 2, ensure the reliability of the device, and extend the service life of the device.

[0050] In order to further ensure the reliability of the connection between the valve core 2 and the main body 1, an end cover 10 is provided at one end of the valve core 2. Figure 6 As shown, the end cover 10 is placed on the upper end of the main body 1 and is clamped on the step surface of the upper end of the valve core 2. The end cover 10 is connected and fixed to the main body 1 by a first fastener 11.

[0051] Optionally, a cylinder connecting plate 14 is provided at one end of the valve core 2 , the cylinder connecting plate 14 is connected to the valve core 2 , and the rotating shaft 19 of the angular stroke cylinder 18 is connected to the cylinder connecting plate 14 .

[0052] Specifically, Figure 6 As shown, a cylinder connecting plate 14 is provided at the lower end of the valve core 2, and the cylinder connecting plate 14 and the valve core 2 are connected and fixed by a third fastener 16. To further increase the connection reliability, a valve core reinforcement plate 15 is also provided between the cylinder connecting plate 14 and the valve core 2, and the third fastener 16 passes through the cylinder connecting plate 14 and the valve core reinforcement plate 15 in sequence to be connected and fixed to the valve core 2.

[0053] Optionally, a sensing element 12 is further provided at one end of the valve core 2 away from the cylinder connecting plate 14, and the sensing element 12 is connected to the valve core 2; a sensor is provided on the angular stroke cylinder 18, and the sensor is connected to the sensing element 12, for obtaining the rotation angle of the valve core 2 according to the position of the sensing element 12.

[0054] In order to further facilitate the determination of the rotation angle and state of the valve core 2, a sensing member 12 is provided at the upper end of the valve core 2. In this embodiment, the sensing member 12 includes a circular plate portion and a sensing portion, wherein the circular plate portion is fitted with the valve core 2 and fixed by a second fastener 13, the circular plate portion can rotate synchronously with the valve core 2, and the sensing portion is arranged perpendicular to the circular plate. A sensor is provided on the angular stroke cylinder 18. When the sensing member 12 rotates with the valve core 2, the sensor can identify the position of the sensing portion and obtain the rotation angle of the valve core 2 according to its position, so that the user can intuitively understand the rotation state of the valve core 2.

[0055] Optionally, a sealing member 9 is provided at the connection between the valve core 2 and the main body 1 .

[0056] Specifically, in this embodiment, two annular grooves are provided on the outer periphery of the valve core 2, and sealing rings are embedded in the annular grooves. The sealing rings are filled in the joint between the valve core 2 and the main body 1 through extrusion deformation, thereby achieving a sealed connection between the valve core 2 and the main body 1 and preventing gas leakage from the joint.

[0057] Optionally, a plurality of main body connection holes 17 are provided on the main body 1 , and the main body 1 can be connected and fixed to the cylinder body of the angular stroke cylinder 18 by using fasteners on the angular stroke cylinder 18 .

[0058] In this embodiment, the fasteners can all be bolts to achieve a detachable connection, and installation and disassembly are convenient and flexible.

[0059] The end gas buffer device of the angular stroke actuator provided in the embodiment of the present application is installed as an independent device outside the actuator. The rotation of the shaft itself drives the valve core to rotate synchronously when the angular stroke cylinder switch is actuated. The conduction area between the intake channel and the exhaust channel is controlled by the rotation of the valve core, thereby adjusting the exhaust volume and exhaust speed. The end gas buffer effect can be achieved without modifying the existing actuator products, which helps to extend the service life of the actuator. The buffer device has a simple structure and is easy to install. In actual applications, its shape and size can be adaptively adjusted according to the model and type of the actuator product to ensure adaptation, high safety and good reliability.

[0060] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0061] It should also be noted that, in this article, the orientation or position relationship indicated by the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. Without more restrictions, an element defined by the phrase "comprising a ..." does not exclude the existence of other identical elements in the process, method, article or terminal device comprising the element.

[0062] The technical solution provided by the present application is described in detail above. The principle and implementation method of the present application are described in this article using specific examples. The description of the above embodiments is only used to help understand the present application, and the content of this specification should not be understood as limiting the present application. At the same time, for those of ordinary skill in the art, according to the present application, there will be different forms of changes in the specific implementation methods and application scopes. It is not necessary and impossible to list all the implementation methods here, and the obvious changes or modifications derived therefrom are still within the scope of protection of the present application.

Claims

1. An end gas buffer device of an angular stroke actuator, characterized in that: Installed outside the angular stroke actuator, the buffer device includes: A main body, wherein a mounting cavity is provided inside, and an air inlet passage and an air exhaust passage communicating with the mounting cavity are opened on the main body; A valve core is rotatably installed in the installation cavity; The angular stroke actuator comprises an angular stroke cylinder and a solenoid valve, wherein the solenoid valve is connected to the angular stroke cylinder and is used to control the rotation of the rotating shaft of the angular stroke cylinder; The main body is installed on the angular stroke cylinder, the air inlet channel is connected to the air outlet end of the solenoid valve, the valve core is connected to the rotating shaft and can rotate synchronously with the rotating shaft; the valve core changes the conduction area between the air inlet channel and the exhaust channel through rotation to adjust the flow rate of the exhaust gas from the solenoid valve.

2. The end gas cushion device of the angular stroke actuator according to claim 1, characterized in that: The air inlet passage comprises an air inlet, the air exhaust passage comprises a main exhaust port and an auxiliary exhaust port, the air inlet and the main exhaust port are respectively communicated with the installation cavity, and the auxiliary exhaust port is directly communicated with the air inlet; An air passage is arranged inside the valve core; the main exhaust port and the air inlet port are connected by the air passage or isolated by the valve core through the rotation of the valve core, so that the gas in the air inlet port is discharged through the main exhaust port and the auxiliary exhaust port together, or is discharged only through the auxiliary exhaust port.

3. The end gas cushion device of the angular stroke actuator according to claim 2, characterized in that: The buffer device includes a first state, a second state and a third state; In the first state, the valve core rotates within a first angle range, and an end of the air inlet close to the installation cavity is completely connected to the air passage; In the second state, the valve core rotates within a second angle range, and one end of the air inlet close to the installation cavity is partially closed by the valve core and partially communicated with the air passage; In the third state, the valve core rotates within a third angle range, and one end of the air inlet close to the installation cavity is completely closed by the valve core.

4. The end gas cushion device of the angular stroke actuator according to claim 2 or 3, characterized in that: The air inlet comprises a first air inlet and a second air inlet, the first air inlet is communicated with a first air outlet end of the solenoid valve, and the second air inlet is communicated with a second air outlet end of the solenoid valve; The auxiliary exhaust port includes a first exhaust port and a second exhaust port, the first exhaust port is communicated with the first air inlet, and the second exhaust port is communicated with the second air inlet.

5. The end gas cushion device of the angular stroke actuator according to claim 2, characterized in that: The cross-sectional area of ​​the auxiliary exhaust port is smaller than the cross-sectional area of ​​the main exhaust port.

6. The end gas buffer device of the angular stroke actuator according to claim 2, characterized in that: A throttle valve is arranged at the auxiliary exhaust port.

7. The end gas cushion device of the angular stroke actuator according to claim 1, characterized in that: A guide sleeve is arranged inside the installation cavity, and the valve core is installed inside the guide sleeve and can rotate relative to the guide sleeve.

8. The end gas cushion device of the angular stroke actuator according to claim 1, characterized in that: A cylinder connecting plate is provided at one end of the valve core, the cylinder connecting plate is connected to the valve core, and the rotating shaft of the angular stroke cylinder is connected to the cylinder connecting plate.

9. The end gas cushion device of the angular stroke actuator according to claim 8, characterized in that: An induction element is also provided at one end of the valve core away from the cylinder connecting plate, and the induction element is connected to the valve core; The angular stroke cylinder is provided with a sensor, which is connected to the sensing element and is used to obtain the rotation angle of the valve core according to the position of the sensing element.

10. The end gas cushion device of the angular stroke actuator according to claim 1, characterized in that: A sealing member is provided at the connection between the valve core and the main body.

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