Air buffering device at tail end of angular travel actuating mechanism

Abstract

The utility model 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] This application relates to the technical field of actuators, and more particularly, to an end air buffer device for an angular travel actuator. Background Art

[0002] Most of the existing pneumatic angular travel actuator products on the market do not have an end buffer function, which results in excessive impact at the end of rapid opening and closing of the actuator, not only affecting the service life of the actuator, but also affecting the life of the valve driven by the actuator. Currently, there are mainly two methods to solve such problems. One is to externally install a damper, and the other is to externally install a throttle valve. However, both methods have problems such as short service life, high failure rate, complex circuit, and poor reliability. This is mainly because the first damper buffer method also belongs to 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 the failure points, and has poor reliability. Utility Model Content

[0003] The purpose of this application is to provide an end air buffer device for an angular travel actuator, aiming to solve the problems of complex structure and poor reliability of the existing buffer methods for actuators.

[0004] This application provides an end air buffer device for an angular travel actuator, which is installed outside the angular travel actuator. The buffer device includes:

[0005] A main body part with an installation cavity inside, and an air inlet channel and an air exhaust channel communicating with the installation cavity are opened on the main body part;

[0006] A valve core rotatably installed in the installation cavity;

[0007] The angular travel actuator includes an angular travel cylinder and a solenoid valve. The solenoid valve is connected to the angular travel cylinder and is used to control the rotation of the rotating shaft of the angular travel cylinder;

[0008] The main body part is installed on the angular travel cylinder. The air inlet channel is communicated with 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 air exhaust channel through rotation to adjust the flow rate of the gas discharged by the solenoid valve.

[0009] Optionally, the air inlet channel includes an air inlet, the air exhaust channel includes a main air exhaust port and an auxiliary air exhaust port. The air inlet and the main air exhaust port are respectively communicated with the installation cavity, and the auxiliary air exhaust port is directly communicated with the air inlet;

[0010] An air passage is provided inside the spool; the main exhaust port and the intake port are connected or blocked by the rotation of the spool through the air passage, so that the gas in the intake port is discharged through both the main exhaust port and the auxiliary exhaust port, or only through the auxiliary exhaust port.

[0011] Optionally, the buffer device includes a first state, a second state, and a third state;

[0012] In the first state, the spool rotates within a first angular range, and one end of the intake port close to the installation cavity is completely connected to the air passage;

[0013] In the second state, the spool rotates within a second angular range, and one end of the intake port close to the installation cavity is partially blocked by the spool and partially connected to the air passage;

[0014] In the third state, the spool rotates within a third angular range, and one end of the intake port close to the installation cavity is completely blocked by the spool.

[0015] Optionally, the intake port includes a first intake port and a second intake port. The first intake port is connected to the first outlet end of the solenoid valve, and the second intake port is connected to the second outlet end of the solenoid valve;

[0016] The auxiliary exhaust port includes a first exhaust port and a second exhaust port. The first exhaust port is connected to the first intake port, and the second exhaust port is connected to the second intake port.

[0017] Optionally, the cross-sectional area of the auxiliary exhaust port is smaller than that of the main exhaust port.

[0018] Optionally, a throttle valve is provided at the auxiliary exhaust port.

[0019] Optionally, a guide sleeve is provided inside the installation cavity, and the spool is installed inside the guide sleeve and can rotate relative to the guide sleeve.

[0020] Optionally, one end of the spool is provided with a cylinder connecting plate, the cylinder connecting plate is connected to the spool, and the rotating shaft of the angular travel cylinder is connected to the cylinder connecting plate.

[0021] Optionally, an induction member is further provided at one end of the spool away from the cylinder connecting plate, and the induction member is connected to the spool; a sensor is provided on the angular travel cylinder, and the sensor is connected to the induction member for obtaining the rotation angle of the spool according to the position of the induction member.

[0022] Optionally, a sealing member is provided at the connection between the spool and the main body part.

[0023] Beneficial effects:

[0024] The present application provides an end air buffer device for a rotary actuator, which is installed outside the rotary actuator and includes: a main body portion with an installation cavity formed therein, and an air inlet passage and an air exhaust passage that are opened on the main body portion and communicate with the installation cavity; a valve core rotatably installed in the installation cavity; the rotary actuator includes a rotary cylinder and a solenoid valve, the solenoid valve is connected to the rotary cylinder and is used to control the rotation of the rotating shaft of the rotary cylinder; the main body portion is installed on the rotary cylinder, the air inlet passage is communicated with 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 passage and the air exhaust passage through rotation to adjust the flow rate of the gas discharged by the solenoid valve. The present application utilizes the rotation of the rotating shaft itself during the switching action of the rotary cylinder to drive the valve core to rotate synchronously, and controls the conduction area between the air inlet passage and the air exhaust passage through the rotation of the valve core, thereby adjusting the exhaust volume and exhaust speed to achieve the end air buffer effect. The overall structure is simple, the installation is convenient, the safety is high, and the reliability is good. Description of the drawings

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 is the pneumatic circuit schematic diagram of the end air buffer device of the rotary actuator connected to the rotary cylinder and the solenoid valve proposed in an embodiment of the present application;

[0027] Figure 2 is the three-dimensional structure schematic diagram of the end air buffer device of the rotary actuator proposed in an embodiment of the present application;

[0028] Figure 3 is the present application Figure 2 the front view of the end air buffer device of the rotary actuator in;

[0029] Figure 4 is the present application Figure 3 the A-A cross-sectional view of the end air buffer device of the rotary actuator in;

[0030] Figure 5 is the present application Figure 2 the side view of the end air buffer device of the rotary actuator in;

[0031] Figure 6 is the present applicationFigure 5 B-B sectional view of the air buffer device at the end of the angular stroke actuator;

[0032] Figure 7 It is a schematic diagram of the air buffer device at the end of the angular stroke actuator proposed in an embodiment of the present application, where the valve core is in the first position during the opening process of the angular stroke cylinder;

[0033] Figure 8 It is a schematic diagram of the air buffer device at the end of the angular stroke actuator proposed in an embodiment of the present application, where the valve core is in the second position during the opening process of the angular stroke cylinder;

[0034] Figure 9 It is a schematic diagram of the air buffer device at the end of the angular stroke actuator proposed in an embodiment of the present application, where the valve core is in the third position during the opening process of the angular stroke cylinder;

[0035] Figure 10 It is a schematic diagram of the air buffer device at the end of the angular stroke actuator proposed in an embodiment of the present application, where the valve core is in the fourth position during the opening process of the angular stroke cylinder;

[0036] Figure 11 It is a schematic diagram of the air buffer device at the end of the angular stroke actuator proposed in an embodiment of the present application, where the valve core is in the first position during the closing process of the angular stroke cylinder;

[0037] Figure 12 It is a schematic diagram of the air buffer device at the end of the angular stroke actuator proposed in an embodiment of the present application, where the valve core is in the second position during the closing process of the angular stroke cylinder;

[0038] Figure 13 It is a schematic diagram of the air buffer device at the end of the angular stroke actuator proposed in an embodiment of the present application, where the valve core is in the third position during the closing process of the angular stroke cylinder;

[0039] Figure 14 It is a schematic diagram of the air buffer device at the end of the angular stroke actuator proposed in an embodiment of the present application, where the valve core is in the fourth position during the closing process of the angular stroke cylinder.

[0040] Explanation of reference numerals:

[0041] 1. Main body part; 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. Sealing member; 10. End cover; 11. First fastener; 12. Inductive member; 13. Second fastener; 14. Cylinder connecting plate; 15. Valve core reinforcement plate; 16. Third fastener; 17. Main body connection hole; 18. Cylinder; 19. Rotating shaft; 20. Solenoid valve. Detailed implementation manners

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0043] In the related art, most pneumatic angular stroke actuator products do not have an end buffer function, which results in excessive impact at the end of the actuator during rapid opening and closing, affecting not only the service life of the actuator but also the life of the valve driven by the actuator. Currently, there are mainly two methods to solve such problems. One is to externally install a damper, and the other is to externally install a throttle valve. However, both methods have problems such as short service life, high failure rate, complex circuit, and poor reliability. This is mainly because the first damper buffering method also belongs to a hard-hitting method, and the service life is not guaranteed; the second throttle valve method has complex piping, requires more accessories to be installed, increases the number of failure points, and has poor reliability.

[0044] In view of this, an end air buffer device for an angular stroke actuator is proposed in the embodiments of the present application.

[0045] See Figure 1 and Figure 2 An end air buffer device for an angular stroke actuator is installed outside the angular stroke actuator. The buffer device includes: a main body 1 with an installation cavity formed inside, and an air inlet channel and an air exhaust channel that are opened on the main body 1 and communicate with the installation cavity; a valve core 2 rotatably installed in the installation cavity.

[0046] 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 the rotating shaft 19 of the angular stroke cylinder 18.

[0047] The main body 1 is installed on the angular stroke cylinder 18. The air inlet channel is communicated with the air outlet end of the solenoid valve 20. 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 air exhaust channel through rotation to adjust the flow rate of the gas discharged by the solenoid valve 20.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] Specifically, in this embodiment, the intake passage includes an air inlet, and the exhaust passage includes a main exhaust port 5 and an auxiliary exhaust port. Among them, the auxiliary exhaust port is directly connected to the air inlet, and the on-off state between the main exhaust port 5 and the air inlet is controlled by the rotation of the valve core 2. Specifically, an air passage is provided inside the valve core 2. When the valve core 2 rotates in the installation cavity, the position of the air passage 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 air passage. In this way, after the gas discharged from the solenoid valve 20 enters the air inlet of the buffer device, a part of it 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 blocked by the valve core 2. After the gas discharged from 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. Furthermore, the operating speed of the rotating shaft 19 of the angular travel cylinder 18 will also be slower.

[0052] 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.

[0053] Specifically, the solenoid valve 20 usually includes two air outlet ends, namely a first air outlet end and a second air outlet end, which are respectively used for exhausting gas when the angular travel cylinder 18 is opened and closed. 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. Refer to Figure 1 and Figure 4 , the first air inlet 3 and the second air inlet 4 are arranged oppositely 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. Refer to Figure 1 , during the opening process of the angular travel cylinder 18, the air 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 travel cylinder 18, the air 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.

[0054] Optionally, a one-way valve is provided between the air inlet and the air outlet end of the solenoid valve 20.

[0055] Specifically, in this 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, it is possible to limit the gas to flow only from the solenoid valve 20 to the buffer device, prevent the gas from flowing back, and ensure that the solenoid valve 20 can exhaust normally.

[0056] 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 communicated with the air passage; in the second state, the valve core 2 rotates within a second angle range, and part of the end of the air inlet close to the installation cavity is blocked by the valve core 2 and part is communicated with the air passage; 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 blocked by the valve core 2.

[0057] Specifically, due to the different rotational positions of the valve core 2 in the installation cavity, the conduction state and conduction area between the air inlet passage and the exhaust passage are different, so that the buffer device has three different states. In this embodiment, the exhaust passage includes a main exhaust port 5 and an auxiliary exhaust port, and the auxiliary exhaust port is always directly communicated with the air inlet. 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 a first angle range. During this process, the end of the air inlet close to the installation cavity is always completely communicated with the air passage, and thus the air inlet is completely communicated with the main exhaust port 5. At this time, the air inlet passage and the exhaust passage are in a completely conductive state, and the conduction area is the largest; in the second state, the valve core 2 rotates within a second angle range. During this process, the valve core 2 gradually blocks the end of the air inlet close to the installation cavity, so that only part of the end of the air inlet close to the installation cavity is communicated with the air passage, and thus the air inlet is partially communicated with the main exhaust port 5. At this time, the air inlet passage and the exhaust passage are in a partially conductive state, and the conduction area gradually decreases as the valve core 2 rotates; in the third state, the valve core 2 rotates within a third angle range. During this process, the valve core 2 completely blocks the end of the air inlet close to the installation cavity, so that the air inlet is completely blocked from the air passage, the air inlet cannot be communicated with the main exhaust port 5, and is only communicated with the auxiliary exhaust port. At this time, the air inlet passage and the exhaust passage are in a partially conductive state, and the conduction area is the smallest.

[0058] The following is a specific description in combination with the switching process of the angular travel cylinder 18.

[0059] Figures 7 - 10 The figure shows the rotation process of the valve core 2 during the opening process of the angular travel cylinder 18.Figures 11 - 14 The figure shows the rotation process of the valve core 2 during the closing process of the angular travel cylinder 18. Taking the M position shown in the figure as the initial position of the rotating shaft 19 when the angular travel cylinder 18 is not started, and the N position shown in the figure as the target position where the rotating shaft 19 rotates to after the angular travel cylinder 18 is opened. During the opening process of the angular travel cylinder 18, the valve core 2 follows the rotating shaft 19 and rotates synchronously from the M position in the counterclockwise direction to the N position, 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 travel cylinder 18, the valve core 2 follows the rotating shaft 19 and rotates from the N position in the clockwise direction to the M position to reset, and the gas discharged from the solenoid valve 20 enters the second air inlet 4 of the buffer device.

[0060] During the opening process of the angular travel cylinder 18, the rotation of the valve core 2 can be divided into three stages, corresponding to three states of the buffer device respectively.

[0061] In the first stage, the valve core 2 rotates counterclockwise by an angle A1 from the first position to the second position, and this process corresponds to the first state of the buffer device. Specifically, refer to Figure 7 , the angular travel cylinder 18 has not started to act, the rotating 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 communicated with the air passage, and the gas entering the first air inlet 3 can be discharged together through the first exhaust port 6 and the main exhaust port 5. Refer to Figure 8 , when the valve core 2 rotates to the second position, the right end of the first air inlet 3 is still completely communicated with the air passage. During the above rotation process, the right end of the first air inlet 3 always remains completely communicated with the air passage, and the gas entering the first air inlet 3 is discharged together 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 passage and the exhaust passage is the largest, the exhaust volume is relatively large, the exhaust speed is relatively fast, and the action speed of the angular travel cylinder 18 is relatively fast.

[0062] In the second stage, the valve core 2 continues to rotate counterclockwise by an angle (B1 - A1) from the second position to the third position, and this process corresponds to the second state of the buffer device. Specifically, refer to Figures 8 - 9 , during 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 only part of the right end of the first air inlet 3 is conducted with the air passage and the conduction area gradually decreases. Furthermore, the gas volume discharged through the main exhaust port 5 also gradually decreases. The buffer device is in the second state, the exhaust volume decreases as the conduction area decreases, the exhaust speed gradually slows down, and the action speed of the angular travel cylinder 18 also gradually slows down. Refer to Figure 9 , when the valve core 2 rotates to the third position, the right end of the first air inlet 3 is just completely blocked by the valve core 2, and the included angle between the third position and the first position is the angle B1.

[0063] In the third stage, the valve core 2 continues to rotate counterclockwise by an angle (C1 - B1) from the third position to reach the fourth position, and this process corresponds to the third state of the buffer device. Specifically, refer to Figure 10 , the valve core 2 reaches the fourth position, that is, the N position in the figure. The right end of the first air inlet 3 is still completely blocked by the valve core 2. The included angle between the fourth position and the first position is the angle C1. During the above rotation process, the right end of the first air inlet 3 is always completely blocked by the valve core 2, the first air inlet 3 is not communicated with 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. Therefore, the action speed of the angular travel cylinder 18 is slow, realizing the end air buffer effect during the opening action.

[0064] Similarly, during the closing process of the angular travel cylinder 18, the rotation of the valve core 2 can still be divided into three stages, and each stage corresponds to one of the three states of the buffer device.

[0065] In the first stage, the valve core 2 rotates clockwise by an angle A2 from the first position to reach the second position, and this process corresponds to the first state of the buffer device. Specifically, refer to Figure 11 , the angular travel cylinder 18 is not closed. The rotating shaft 19 and the valve core 2 are both in the first position, that is, the N position in the figure. At this time, the left end of the second air inlet 4 is completely communicated with the air passage, and the gas entering the second air inlet 4 can be discharged through the second exhaust port 7 and the main exhaust port 5 together. As the angular travel cylinder 18 acts, the valve core 2 rotates to the second position. As shown in Figure 12 , the left end of the second air inlet 4 is still completely communicated with the air passage. During the above rotation process, the left end of the second air inlet 4 always remains completely communicated with the air passage, and the gas entering the second air inlet 4 is discharged through the second exhaust port 7 and the main exhaust port 5 together. The buffer device is in the first state, the conduction area between the air inlet passage and the exhaust passage is the largest, the exhaust volume is large, the exhaust speed is fast, and the action speed of the angular travel cylinder 18 is fast.

[0066] In the second stage, the valve core 2 rotates clockwise by an angle (B2 - A2) from the second position to reach the third position, and this process corresponds to the second state of the buffer device. Specifically, refer to Figures 12 - 13 , during 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. Only part of the left end of the second air inlet 4 is conducted with the air passage and the conduction area gradually decreases. The gas volume discharged through the main exhaust port 5 gradually decreases. The buffer device is in the second state, the exhaust volume decreases as the conduction area decreases, the exhaust speed gradually slows down, and the action speed of the angular travel cylinder 18 also gradually slows down. Refer to Figure 13 , when the valve core 2 reaches the third position, the left end of the second air inlet 4 is just completely blocked by the valve core 2. The included angle between the third position and the first position is the angle B2.

[0067] In the third stage, the valve core 2 rotates clockwise by an angle (C2 - B2) from the third position to the fourth position, and this process corresponds to the third state of the buffer device. Specifically, refer to Figure 14 , when the valve core 2 reaches the fourth position, that is, the M position in the figure, the left end of the second air inlet 4 is still completely blocked by the valve core 2, and the included angle between the fourth position and the first position is the angle C2. During the above rotation process, the left end of the second air inlet 4 is always completely blocked by the valve core 2, the second air inlet 4 is not communicated with 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. Therefore, the action speed of the angular travel cylinder 18 is slow, and the end air buffer effect during the closing action is achieved.

[0068] Optionally, the cross-sectional area of the auxiliary exhaust port is smaller than the cross-sectional area of the main exhaust port 5.

[0069] Specifically, in this 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. When the buffer device is in the third state, that is, when exhausting only through the first exhaust port 6 or the second exhaust port 7, the exhaust volume is greatly reduced, ensuring a slow exhaust speed and further enhancing the buffering effect.

[0070] Optionally, a throttle valve is provided at the auxiliary exhaust port.

[0071] Specifically, in this embodiment, throttle valves can be provided at both the first exhaust port 6 and the second exhaust port 7. The throttle valves can further finely adjust the flow rate of the exhausted gas, thereby more precisely controlling the exhaust speed and the rotation speed of the angular travel cylinder 18.

[0072] 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.

[0073] Specifically, the shape of the guide sleeve 8 is set to be annular. The guide sleeve 8 is relatively fixedly embedded inside 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, preventing the valve core 2 from shaking inside the installation cavity, reducing the friction between the valve core 2 and the main body part 1, ensuring the smooth rotation of the valve core 2, guaranteeing the reliability of the device operation, and extending the service life of the device.

[0074] To further ensure the connection reliability between the valve core 2 and the main body part 1, an end cover 10 is provided at one end of the valve core 2. As Figure 6 shown, the end cover 10 is placed on the upper end of the main body part 1 and is simultaneously clamped on the step surface at the upper end of the valve core 2. The end cover 10 is connected and fixed to the main body part 1 through the first fastener 11.

[0075] Optionally, one end of the valve core 2 is provided with a cylinder connection plate 14. The cylinder connection plate 14 is connected to the valve core 2, and the rotating shaft 19 of the angular travel cylinder 18 is connected to the cylinder connection plate 14.

[0076] Specifically, as Figure 6 shown, a cylinder connection plate 14 is provided at the lower end of the valve core 2. The cylinder connection plate 14 and the valve core 2 are fixedly connected by a third fastener 16. To further increase the connection reliability, a valve core reinforcement plate 15 is also provided between the cylinder connection plate 14 and the valve core 2. The third fastener 16 passes through the cylinder connection plate 14, the valve core reinforcement plate 15, and the valve core 2 in sequence and is fixedly connected.

[0077] Optionally, an induction member 12 is further provided at one end of the valve core 2 away from the cylinder connection plate 14. The induction member 12 is connected to the valve core 2; a sensor is provided on the angular travel cylinder 18, and the sensor is connected to the induction member 12 for obtaining the rotation angle of the valve core 2 according to the position of the induction member 12.

[0078] To further facilitate the determination of the rotation angle and state of the valve core 2, an induction member 12 is provided at the upper end of the valve core 2. In this embodiment, the induction member 12 includes a circular plate portion and an induction portion. Among them, the circular plate portion is fitted and installed 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 induction portion is perpendicular to the circular plate. A sensor is provided on the angular travel cylinder 18. When the induction member 12 rotates with the valve core 2, the sensor can identify the position of the induction 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.

[0079] Optionally, a seal 9 is provided at the connection between the valve core 2 and the main body portion 1.

[0080] Specifically, in this embodiment, two annular grooves are provided on the outer periphery of the valve core 2. 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 portion 1 by extrusion deformation to achieve a sealed connection between the valve core 2 and the main body portion 1 and prevent gas from leaking from the joint.

[0081] Optionally, a plurality of main body connection holes 17 are provided on the main body portion 1. Fasteners on the angular travel cylinder 18 can be used in cooperation to fixedly connect the main body portion 1 and the cylinder block of the angular travel cylinder 18.

[0082] In this embodiment, the fasteners can all be bolts to achieve detachable connection, which is convenient and flexible for installation and disassembly.

[0083] The end air buffer device of the angular travel actuator provided by the embodiment of the present application is installed outside the actuator as an independent device. When the angular travel cylinder switches, the rotation of the rotating shaft itself drives the valve core to rotate synchronously. By rotating the valve core, the conduction area between the air inlet channel and the exhaust channel is controlled, so as to adjust the exhaust volume and exhaust speed. The end air 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 practical applications, its shape and size can be adaptively adjusted according to the model and type of the actuator product to ensure adaptation, with high safety and good reliability.

[0084] It should be noted that the embodiments in this specification are all described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other.

[0085] It should also be noted that in this article, the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, so it cannot be understood as a limitation to 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 any actual relationship or order between these entities or operations, nor can they be understood as indicating or implying relative importance. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or terminal device. Without further limitation, the element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or terminal device including the element.

[0086] The technical solutions provided by the present application have been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only for helping to understand the present application, and the content of this specification should not be understood as a limitation to the present application. At the same time, for those of ordinary skill in the art, according to the present application, there will be various forms of changes in the specific implementation manner and application scope. It is not necessary and impossible to list all the implementation manners here, and the obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. An end air buffer device for an angular stroke actuator, characterized in that Installed outside the angular travel actuator, the buffer device includes: A main body part with an installation cavity inside. An air inlet channel and an exhaust channel communicating with the installation cavity are formed on the main body part; A valve core rotatably installed in the installation cavity; The angular travel actuator includes an angular travel cylinder and a solenoid valve. The solenoid valve is connected to the angular travel cylinder and is used to control the rotation of the rotating shaft of the angular travel cylinder; The main body part is installed on the angular travel cylinder. The air inlet channel is communicated with 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 gas discharged by the solenoid valve.

2. The air buffer device at the end of the angular travel actuator according to claim 1, characterized in that: 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 provided inside the valve core; the main exhaust port and the air inlet are communicated or blocked by the valve core through the rotation of the valve core, so that the gas in the air inlet is discharged through the main exhaust port and the auxiliary exhaust port together, or only through the auxiliary exhaust port.

3. The air buffer device at the end of the angular travel 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 one end of the air inlet close to the installation cavity is completely communicated with 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 blocked 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 blocked by the valve core.

4. The air buffer device at the end of the angular travel actuator according to claim 2 or 3, characterized in that: The air inlet includes a first air inlet and a second air inlet. The first air inlet is communicated with the first air outlet end of the solenoid valve, and the second air inlet is communicated with the 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 air buffer device at the end of the angular travel 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 air buffer device at the end of the angular travel actuator according to claim 2, characterized in that: A throttle valve is provided at the auxiliary exhaust port.

7. The air buffer device at the end of the angular travel actuator according to claim 1, characterized in that: A guide sleeve is provided inside the installation cavity. The valve core is installed inside the guide sleeve and can rotate relative to the guide sleeve.

8. The end air buffer device of the angular travel actuator according to claim 1, characterized in that: One end of the valve core is provided with a cylinder connecting plate, the cylinder connecting plate is connected to the valve core, and the rotating shaft of the angular travel cylinder is connected to the cylinder connecting plate.

9. The end air buffer device of the angular travel actuator according to claim 8, characterized in that: An induction member is further provided at one end of the valve core away from the cylinder connecting plate, and the induction member is connected to the valve core; A sensor is provided on the angular travel cylinder, and the sensor is connected to the induction member for obtaining the rotation angle of the valve core according to the position of the induction member.

10. The end air buffer device of the angular travel actuator according to claim 1, characterized in that: A seal is provided at the connection between the valve core and the main body portion.

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