Thrust ring with ejector pin anti-drop mechanism, switching device and electric actuator

Abstract

The application relates to the technical field of electric actuators, and specifically discloses a thrust ring with a top pin anti-falling mechanism, which comprises a thrust ring body, one side of the thrust ring body is formed with an insertion slot, the other side of the thrust ring body is formed with an arc-shaped protrusion, the top pin anti-falling mechanism comprises an elastic piece, the elastic piece is used for sleeving the outside of a top pin, one end of the elastic piece is fixed to the side wall of the thrust ring body, and the application further discloses a switching device which comprises the above-mentioned thrust ring with the top pin anti-falling mechanism, a combination, a compression spring, a top pin and a switching handle assembly; and the application further discloses an electric actuator which comprises the above-mentioned switching device, an actuator shell, a motor, an output shaft, a worm gear, a hand wheel and a worm which is rotationally installed in the actuator shell. Through the arrangement of the elastic piece, the end of the top pin can be limited, the top pin is prevented from being separated from the limiting ring body, and the risk of failure of the manual-automatic switching structure is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of electric actuators, in particular to a thrust ring with a top pin anti-disengagement mechanism, a switching device and an electric actuator. BACKGROUND

[0002] An electric actuator is a kind of driving device that can provide linear or rotary motion, which works by using a certain driving energy and under the action of a certain control signal. In order to facilitate the equipment debugging under power failure and manual handling in emergency, most automatic actuators are equipped with a manual-automatic switching structure for switching the automatic state and the manual adjustment state of the equipment.

[0003] As shown in Figure 1 and Figure 2 , the manual-automatic switching structure in the related art sets a combination 002 on the output shaft 001, when the equipment is in an automatic state, the motor serves as a power source and drives the combination 002 to rotate by using the worm gear 003 and the worm gear cooperation, and then the combination 002 drives the output shaft 001 to rotate; when switching from the automatic state to the manual state, the combination 002 moves axially along the output shaft 001, is disengaged from the worm gear 003, and is engaged with the hand wheel 004, at this time, by rotating the hand wheel 004, the output shaft 001 is driven to rotate by using the combination 002, and manual control is realized; when the motor starts, the combination 002 is automatically reset by using the compression spring on the output shaft 001 and the eccentricity of the worm gear 003, and automatic operation is realized.

[0004] In order to realize the axial movement of the combination 002 along the output shaft 001, a thrust ring 005 is usually set on the output shaft 001, the specific structure of the thrust ring 005 is shown in Figure 2 , the two symmetrically arranged protruding ends of the thrust ring 005 abut against the end of the combination 002, at the same time, the thrust ring 005 is supported by inserting a top pin 006 into the actuator housing, the top pin 006 acts into the groove 007 on one side of the thrust ring 005 and tightly presses the thrust ring 005, and the switching handle acts on the other side of the thrust ring 005, when the switching handle drives the thrust ring 005, the thrust ring 005 tightly presses the combination 002 and makes the combination 002 move axially.

[0005] Therefore, in the side-mounted state, during the reset process of the combination 002, because the combination 002 needs to rotate with the output shaft 001, the thrust ring 005 will slightly rotate with the combination 002 due to the vibration of the equipment operating environment or the friction between the combination 002 and the thrust ring 005, the rotation of the thrust ring 005 causes the top pin 006 to slide out of the gap of the groove 007, and subsequently when switching to the manual state, because of the lack of support of the top pin 006, the manual-automatic switching structure fails. SUMMARY

[0006] The purpose of this application is to provide a thrust ring installation mechanism, a switching device and an electric actuator, which solves the problem in the prior art that the thrust ring rotates during the resetting process, causing the ejector pin to fall off, and ultimately causing the manual-automatic switching structure to fail.

[0007] In the first aspect, the present application provides a thrust ring with a push pin anti-slip mechanism adopts the following technical solution:

[0008] A thrust ring with an ejector pin anti-falling mechanism includes a thrust ring body, one side of the thrust ring body is formed with a slot for inserting the end of the ejector pin, and the other side of the thrust ring body is formed with an arc-shaped protrusion for abutting against the side wall of the connector. The ejector pin anti-falling mechanism includes an elastic member, which is used to be sleeved on the outside of the ejector pin, and one end of the elastic member is fixed to the side wall of the thrust ring body and covers the slot notch.

[0009] By adopting the above technical solution, since the end of the elastic member is fixed to the thrust ring body, when the thrust ring body moves along the axis of the output shaft, the elastic member is stretched and deformed. When the thrust ring body returns to its original position following the coupling, since the elastic member is located on the outer wall of the ejector pin, it can limit the end of the ejector pin inserted into the slot, preventing the ejector pin end from sliding out of the slot notch. As the thrust ring body gradually returns to its initial position, the end of the ejector pin gradually abuts the bottom of the slot. By providing the elastic member, the end of the ejector pin can be limited without affecting the sliding movement of the limit ring body along the axis of the output shaft, preventing it from separating from the limit ring body, thereby reducing the risk of failure of the manual-automatic switching structure.

[0010] Optionally, the elastic member is a spring.

[0011] By adopting the above technical solution and selecting a spring as the elastic member, the spring is not only easy to install, but also low in price and has a long service life.

[0012] Optionally, the ejector pin anti-falling mechanism also includes a clamping plate and a locking member, wherein the locking member is used to fasten the clamping plate to the thrust ring body, and the clamping plate is pressed against the outermost circle of the elastic member end, so that the outermost circle of the elastic member end is fixed to the thrust ring body.

[0013] By adopting the above technical solution, the elastic member is fixed by using a compression plate in combination with a locking member. On the one hand, it is easy to install and also convenient to disassemble and replace later. On the other hand, the fastening effect is good, so that the end of the elastic member is always connected to the thrust ring body, which will not affect the deformation of the elastic member, and also makes the elastic member stably connected to the thrust ring body.

[0014] Optionally, the number of the compression plates is two, and the two compression plates are respectively located on both sides of the outermost circle of the end of the elastic member, and the two compression plates are symmetrically arranged about the axis of the elastic member.

[0015] By adopting the above technical solution, the two pressing sheets are symmetrically installed on both sides of the elastic member, so that the elastic member is installed more stably and is not easy to fall off from the thrust ring body.

[0016] Optionally, a mounting groove is formed on the side wall of the thrust ring body, the mounting groove and the slot form a stepped shape, and the outermost ring portion of the end portion of the elastic member is located in the mounting groove.

[0017] By adopting the above technical solution, a part of the outermost ring of the end of the elastic member is installed in the installation groove, which facilitates the installation of the elastic member. When the elastic member is deformed, the outermost ring of the end of the elastic member can still maintain a relatively stable connection with the thrust ring body.

[0018] Optionally, the locking member is a screw, which passes through the pressing plate and is tightened on the thrust ring body.

[0019] By adopting the above technical solution, the locking member is a screw, which is convenient for installation and disassembly and has a better locking effect on the compression plate.

[0020] In a second aspect, the present application provides a switching device that adopts the following technical solution:

[0021] A switching device, comprising the above-mentioned thrust ring with a push pin anti-drop mechanism, further comprising a coupling and a compression spring sleeved on the output shaft, a push pin inserted into a slot of the thrust ring body, and a switching handle assembly for pushing the thrust ring body to move and engage with the worm gear;

[0022] The coupling slides axially along the output shaft and is limited circumferentially with the output shaft. One end of the coupling is provided with a first clamping portion for clamping and cooperating with the handwheel, and the other end of the coupling is provided with a second clamping portion for clamping and cooperating with the worm gear. The compression spring abuts against one side of the coupling located at the first clamping portion, and the arc-shaped protrusion of the thrust ring body abuts against one side of the coupling located at the second clamping portion. The end of the ejector pin away from the thrust ring body is used for inserting into the actuator housing.

[0023] By adopting the above technical solution, when the automatic state is switched to the manual state, the switching handle assembly is used to push the thrust ring body to move, and the thrust ring body acts on the coupling and pushes the coupling to move toward the handwheel until the first clamping portion is engaged with the handwheel. At this time, the second clamping portion of the coupling is completely disengaged from the worm gear, and the switching handle assembly is engaged with the worm gear. In this state, the handwheel can be rotated to drive the output shaft to rotate by the coupling; when the manual state is switched to the automatic state, the motor is started, and the worm gear is driven to rotate by the motor, and the engagement between the worm gear and the switching handle assembly is released. At this time, the compression spring pushes the coupling to move toward the worm gear, and the coupling drives the thrust ring to move axially synchronously until the second clamping portion of the coupling is engaged with the worm gear. When the first clamping portion is completely disengaged from the handwheel, the switching from the manual state to the automatic state is completely completed.

[0024] When the above-mentioned coupling moves toward the worm gear under the action of the compression spring, when the second engaging portion just starts to engage with the worm gear, the coupling immediately rotates with the worm gear, and the coupling still moves toward the worm gear. In this state, the thrust ring still moves synchronously with the coupling; due to the limitation of the ejector pin, the thrust ring will not rotate and will only move axially along the output shaft. At the same time, under the cover of the elastic member, the ejector pin can always remain in the slot of the thrust ring body and will not separate from the thrust ring body.

[0025] Optionally, the switching handle assembly includes a rotating handle rotatably mounted on the actuator housing, a shift block for abutting the side wall of the thrust ring body, a clamping block for clamping with the worm gear, and a reset spring mounted on the rotating handle, one end of the outer side of the reset spring is clamped with the actuator housing, one end of the inner side of the reset spring is used to clamp with the outer wall of the rotating handle, the shift block is fixedly mounted on the rotating handle and rotates synchronously with the rotating handle, and the clamping block is fixedly mounted on the side of the shift block close to the worm gear.

[0026] By adopting the above technical solution, when the switching handle assembly is used to push the thrust ring to move, the rotating handle is turned to drive the shift block to rotate. When the rotating handle is rotated to a certain angle, the shift block abuts against the side wall of the thrust ring. As the rotating handle is further rotated, the shift block pushes the thrust ring to move in the direction of the handwheel. At the same time, the coupling moves synchronously with the thrust ring. When the coupling is engaged with the handwheel, the end face of the coupling block just abuts against the worm gear, realizing the switching from the automatic state to the manual state.

[0027] When switching from manual mode to automatic mode, the motor drives the worm gear. As the worm gear rotates, the engaging block gradually disengages from the worm gear. Driven by the reset coil spring, the handle automatically rotates and resets. At this point, the shifting block no longer acts on the side wall of the thrust ring. Due to the lack of support, the coupling begins to move toward the worm gear under the action of the compression spring and disengages from the handwheel. Finally, the coupling engages with the worm gear, switching from automatic mode to manual mode. This setting is simple and convenient to adjust and can automatically reset to automatic mode.

[0028] Optionally, the coupling includes a sliding sleeve sleeve mounted on the output shaft and a retaining ring formed on the end of the sliding sleeve, the inner wall of the sliding sleeve is formed with a slider that slides in conjunction with a sliding groove axially opened on the output shaft, the first clamping portion includes a stop block arranged on the side of the retaining ring close to the handwheel, the second clamping portion includes a stop column arranged on the side of the sliding sleeve close to the worm gear, and the arc-shaped protrusion of the thrust ring abuts against the side wall of the retaining ring.

[0029] By adopting the above technical solution, the sliding block on the sliding sleeve cooperates with the sliding groove on the output shaft, thereby preventing relative rotation between the coupling and the output shaft.

[0030] In a third aspect, the present application provides an electric actuator that adopts the following technical solution:

[0031] An electric actuator includes the above-mentioned switching device, and also includes an actuator housing, a motor fixedly installed in the actuator housing, an output shaft rotatably installed in the actuator housing, a worm gear and a handwheel rotatably installed on the output shaft, and a worm rotatably installed in the actuator housing, the worm gear is engaged with the worm, the handwheel is located outside the actuator housing, and the worm and the rotating shaft of the motor are transmitted through a helical gear set.

[0032] By adopting the above technical solution, when the electric actuator switches from the automatic state to the manual state, the risk of failure of the manual-automatic switching structure is reduced by providing an elastic member.

[0033] In summary, this application includes at least one of the following beneficial technical effects:

[0034] 1. By setting up an elastic member, since the end of the elastic member is fixed on the thrust ring body, when the thrust ring body moves along the axis of the output shaft, the elastic member is stretched and deformed. When the thrust ring body follows the reset of the coupling, since the elastic member is located on the outer wall of the ejector pin, it can limit the end of the ejector pin inserted into the slot, preventing the ejector pin end from sliding out of the slot notch. As the thrust ring body gradually resets to its initial position, the end of the ejector pin gradually abuts against the bottom of the slot. The elastic member can limit the end of the ejector pin without affecting the sliding of the limit ring body along the axis of the output shaft, preventing it from separating from the limit ring body, thereby reducing the risk of failure of the manual-automatic switching structure.

[0035] 2. The elastic member is fixed by using the compression piece in conjunction with the locking member. On the one hand, it is easy to install and also easy to disassemble and replace later. On the other hand, it has a good fastening effect, so that the end of the elastic member is always in contact with the thrust ring body, which will not affect the deformation of the elastic member, and at the same time, the elastic member and the thrust ring body are stably connected.

[0036] 3. By opening a mounting groove, a part of the outermost ring of the end of the elastic member is installed in the mounting groove, which facilitates the installation of the elastic member. When the elastic member is deformed, the outermost ring of the end of the elastic member can still maintain a relatively stable connection with the thrust ring body. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a structural diagram of the manual-automatic switching structure in the background technology of this application to illustrate the related art;

[0038] Figure 2 This is a schematic diagram in the background technology of this application to illustrate the specific structure of the thrust ring in the related technology;

[0039] Figure 3 It is a schematic diagram of the overall structure of the electric actuator in the background technology of this application;

[0040] Figure 4 This is a schematic diagram showing the structure of the electric actuator transmission system according to an embodiment of the present application;

[0041] Figure 5 This is a schematic structural diagram of the embodiment of the present application to illustrate the coordination relationship between the various components in the switching device when the electric actuator is in the automatic state;

[0042] Figure 6 This is an exploded view of an embodiment of the present application to illustrate the positional relationship between the coupling, the thrust ring body, and the worm gear;

[0043] Figure 7 This is a structural diagram of the embodiment of the present application to illustrate the coordination relationship between the various components in the switching device when the electric actuator is in manual mode;

[0044] Figure 8This is a schematic structural diagram showing the thrust ring and ejector pin anti-slip mechanism according to an embodiment of the present application;

[0045] Figure 9 yes Figure 8 Enlarged schematic diagram of part A.

[0046] In the figure, 001, output shaft; 002, coupling; 003, worm gear; 004, handwheel; 005, thrust ring; 006, ejector pin; 007, groove; 1, actuator housing; 2, motor; 3, output shaft; 4, worm gear; 5, handwheel; 6, worm; 7, coupling; 71, sliding sleeve; 72, retaining ring; 8, ejector pin; 9, switching handle assembly; 91, turning handle; 92, shifting block; 93, clamping block; 94, reset coil spring; 10, compression spring; 11, thrust ring body; 12, arc-shaped protrusion; 13, sliding block; 14, retaining block; 15, retaining column; 16, clamping groove; 17, slot; 18, ejector pin anti-slip mechanism; 181, elastic member; 182, pressing plate; 183, locking member; 19, mounting groove; 20, placement groove. DETAILED DESCRIPTION

[0047] The following is combined with Figure 3 -Attached Figure 9 , further details of this application are given.

[0048] Example:

[0049] The present application discloses an electric actuator. Figure 3 and Figure 4 The electric actuator comprises an actuator housing 1, a motor 2 fixedly mounted on the actuator housing 1, an output shaft 3 rotatably mounted on the actuator housing 1, a worm gear 4 and a handwheel 5 rotatably mounted on the output shaft 3, and a worm 6 rotatably mounted within the actuator housing 1. One end of the output shaft 3 extends from the actuator housing 1 for connection to the valve stem in the valve; the worm gear 4 is located within the actuator housing 1 and meshes with the worm 6. The worm 6 and the rotating shaft of the motor 2 are driven by a helical gear set. The handwheel 5 is located outside the actuator housing 1. A switching device is also provided within the actuator housing 1. This switching device is used to engage with the worm gear 4 or the handwheel 5 and transmit power to the output shaft 3 to achieve power output from the output shaft 3. The switching device is primarily used to switch between automatic and manual modes during use of the electric actuator.

[0050] Specifically, refer to Figure 4 and Figure 5The switching device includes a thrust ring and a coupling 7 mounted on the output shaft 3, a push pin 8 inserted into the actuator housing 1, and a switching handle assembly 9 for driving the thrust ring. The coupling 7 can slide axially along the output shaft 3 and form a circumferential limit with the output shaft 3. At the same time, a first clamping portion is provided at one end of the coupling 7 and a second clamping portion is provided at the other end. The first clamping portion is used to engage with the handwheel 5, and the second clamping portion is used to engage with the worm gear 4. As the coupling 7 slides axially on the output shaft 3, the engagement between the first clamping portion and the handwheel 5 and the engagement between the second clamping portion and the worm gear 4 can be switched back and forth, thereby realizing the switching between the automatic state and the manual state.

[0051] At the same time, a compression spring 10 is sleeved on the output shaft 3. One end of the compression spring 10 abuts against the sleeve on the output shaft 3, and the other end of the compression spring 10 abuts against one side of the first engaging portion of the coupling 7. In the automatic state, the compression spring 10 pushes the coupling 7 to engage with the worm gear 4, thereby achieving the effect of the worm gear 4 driving the coupling 7 to rotate. At the same time, the compression spring 10 also has the function of resetting the coupling 7 during the process of switching from manual state to automatic state.

[0052] Reference Figure 5 and Figure 6 , wherein the thrust ring includes an annular thrust ring body 11, and two arc-shaped protrusions 12 are integrally formed on the side of the thrust ring body 11 away from the worm gear 4. The two arc-shaped protrusions 12 are symmetrically arranged about the axis of the thrust ring body 11, and the two arc-shaped protrusions 12 abut against one side of the connector 7 located at the second clamping portion. One end of the ejector pin 8 is plugged into the thrust ring body 11, and the other end is inserted into the actuator housing 1. When the switching handle assembly 9 pushes the thrust ring body 11 to operate, the position where the switching handle assembly 9 acts on the thrust ring body 11 and the position where the ejector pin 8 is inserted into the thrust ring body 11 are symmetrical about the line connecting the two arc-shaped protrusions 12.

[0053] Reference Figure 7 When the actuator is switched from the automatic state to the manual state by using the switching device, the switching handle assembly 9 is first used to push the thrust ring body 11 to move. The thrust ring body 11 acts on the coupling 7 and pushes the coupling 7 toward the handwheel 5 until the first engaging portion is engaged with the handwheel 5. At this time, the second engaging portion of the coupling 7 is completely disengaged from the worm gear 4, and the switching handle assembly 9 is engaged with the worm gear 4. In this state, the handwheel 5 can be turned to drive the output shaft 3 to rotate by using the coupling 7;

[0054] Reference Figure 5When the actuator is switched from manual mode to automatic mode using the switching device, the motor 2 is started, and the motor 2 drives the worm gear 4 to rotate, and the engagement between the worm gear 4 and the switching handle assembly 9 is released. At this time, the compression spring 10 pushes the coupling 7 to move toward the worm gear 4, and the coupling 7 drives the thrust ring to move axially synchronously until the second engaging portion of the coupling 7 engages with the worm gear 4. At this time, the first engaging portion is completely disengaged from the handwheel 5, and the actuator is in automatic mode.

[0055] Specifically, refer to Figure 6 The coupling 7 includes a sliding sleeve 71 sleeved on the output shaft 3 and a retaining ring 72 formed at the end of the sliding sleeve 71. The retaining ring 72 is located on the side of the sliding sleeve 71 close to the handwheel 5. The inner wall of the sliding sleeve 71 is formed with multiple sliders 13 along its circumference. Preferably, the slider 13 is rectangular, and the length direction of the slider 13 is the same as the axial direction of the sliding sleeve 71. The slider 13 is used to slide in the sliding groove axially opened on the output shaft 3. This setting can prevent relative rotation between the coupling 7 and the output shaft 3. The arc-shaped protrusion 12 of the thrust ring abuts against the side wall of the retaining ring 72 away from the compression spring 10.

[0056] Specifically, the first engaging portion includes a stopper 14 formed on the side of the retaining ring 72 near the handwheel 5. There are multiple stoppers 14, which are evenly spaced along the circumference of the retaining ring 72. Preferably, there are two stoppers 14. When the coupling 7 moves toward the handwheel 5, the stopper 14 gradually engages with the engaging block on the handwheel 5. Once the two are fully engaged, the coupling 7 can be rotated by turning the handwheel 5.

[0057] Similarly, the second engaging portion includes a plurality of retaining posts 15 formed on the side of the sliding sleeve 71 near the worm gear 4. The retaining posts 15 are also provided in a uniform pattern along the circumference of the sliding sleeve 71. Preferably, there are four retaining posts 15. As the coupling 7 moves toward the worm gear 4, the retaining posts 15 gradually engage with the posts on the worm gear 4. Once the retaining posts are fully engaged, the rotation of the worm gear 4 drives the coupling 7 to rotate.

[0058] Specifically, refer to Figure 5 and Figure 7 The switching handle assembly 9 includes a rotating handle 91 rotatably mounted on the actuator housing 1, a shift block 92 for abutting the side wall of the thrust ring body 11, a clamping block 93 for clamping with the worm gear 4, and a reset coil spring 94 mounted on the rotating handle 91, wherein the shift block 92 is sleeved and fixed on the end of the rotating handle 91, the shift block 92 rotates synchronously with the rotating handle 91, the clamping block 93 is integrally formed on the side of the shift block 92 close to the worm gear 4, and one end of the outer side of the reset coil spring 94 is clamped with the actuator housing 1, and one end of the inner side of the reset spring is clamped with the outer wall of the rotating handle 91.

[0059] A snap-in groove 16 is formed on the side of the worm gear 4 near the handwheel 5. The snap-in groove 16 is arc-shaped and located at the edge of the worm gear 4. The cross-sectional area of ​​the bottom of the snap-in groove 16 gradually decreases in the direction opposite to the rotation of the worm gear 4 until the cross-sectional area of ​​the bottom of the snap-in groove 16 is zero. The snap-in groove 16 is used to snap into contact with the snap-in block 93. When the snap-in block 93 is snapped into the snap-in groove 16, as the worm gear 4 rotates, the contact area between the snap-in block 93 and the snap-in groove 16 gradually decreases until the snap-in block 93 disengages from the snap-in groove 16, thereby separating the snap-in block 93 from the worm gear 4.

[0060] Reference Figure 7 When the actuator is adjusted from the automatic state to the manual state by using the switching handle assembly 9, the rotating handle 91 is rotated, and the rotating handle 91 drives the shift block 92 to rotate. When the rotating handle 91 is rotated to a certain angle, the shift block 92 abuts against the side wall of the thrust ring body 11. At the same time, the reset coil spring 94 is deformed. As the rotating handle 91 is further rotated, the shift block 92 pushes the thrust ring toward the handwheel 5. At the same time, the coupling 7 moves synchronously with the thrust ring. When the coupling 7 is engaged with the handwheel 5, the end face of the coupling block 93 just abuts against the worm gear 4, realizing the switching from the automatic state to the manual state.

[0061] Reference Figure 5 When the actuator is adjusted from the manual state to the automatic state, the motor 2 drives the worm gear 4 to rotate. As the worm gear 4 rotates, the clamping block 93 gradually disengages from the worm gear 4. Driven by the reset coil spring 94, the turning handle 91 starts to automatically rotate and reset. At this time, the shift block 92 no longer acts on the side wall of the thrust ring. Due to the lack of support, the coupling 7 starts to move toward the direction of the worm gear 4 under the action of the compression spring 10 and disengages from the handwheel 5. Finally, the coupling 7 is engaged with the worm gear 4, realizing the switch from the automatic state to the manual state.

[0062] At the same time, refer to Figure 8 and Figure 9 A cylindrical slot 17 is formed in the side wall of the thrust ring body 11 near the worm gear 4. Preferably, the slot 17 is located on a perpendicular line to the midpoint of the line connecting the two arc-shaped protrusions 12. The end of the ejector pin 8 is inserted into the slot 17. A ejector pin anti-slip mechanism 18 is provided on the side of the thrust ring body 11 near the ejector pin 8. The ejector pin anti-slip mechanism 18 is used to prevent the ejector pin 8 from detaching from the thrust ring body 11 during the switching process between the automatic and manual modes of the actuator.

[0063] The ejector pin anti-slip mechanism 18 includes an elastic member 181, a pressing piece 182 and a locking member 183, wherein one end of the elastic member 181 is fixed to the side wall of the thrust ring body 11 through the cooperation of the pressing piece 182 and the locking member 183, and the other end of the elastic member 181 abuts against the inner wall of the actuator housing 1, and the elastic member 181 is covered at the notch of the slot 17. During specific installation, the elastic member 181 is sleeved on the outside of the ejector pin 8.

[0064] Since the end of the elastic member 181 is fixed on the thrust ring body 11, when the thrust ring body 11 follows the reset of the connector 7, since the elastic member 181 is located on the outer wall of the ejector pin 8, it can limit the end of the ejector pin 8 inserted into the slot 17, preventing the end of the ejector pin 8 from slipping out of the notch of the slot 17. As the thrust ring body 11 gradually resets to its initial position, the end of the ejector pin 8 also gradually abuts against the bottom of the slot 17, preventing it from separating from the thrust ring body 11.

[0065] Preferably, the elastic member 181 is a spring, which is not only easy to install, but also inexpensive and has a long service life. When the spring is installed on the thrust ring body 11 as the elastic member 181, one side of the outermost circle of the end of the elastic member 181 abuts against the side wall of the thrust ring body 11, and the other side abuts against the pressing piece 182. At the same time, the pressing piece 182 is fixed to the side wall of the thrust ring body 11 by the locking member 183.

[0066] That is to say, the outermost circle of the end of the elastic member 181 is pressed by the clamping plate 182, so that the outermost circle of the end of the elastic member 181 is fixed on the thrust ring body 11. On the one hand, it is convenient for installation and convenient for later disassembly and replacement; on the other hand, the fastening effect is good, so that the end of the elastic member 181 is always connected to the thrust ring body 11, which will not affect the deformation of the elastic member 181, and at the same time, the elastic member 181 is stably connected to the thrust ring body 11.

[0067] Furthermore, two pressing pieces 182 are selected, and the two pressing pieces 182 are respectively located on either side of the outermost circle of the end of the elastic member 181, and the two pressing pieces 182 are symmetrically arranged about the axis of the elastic member 181. By using the two pressing pieces 182 to simultaneously press on both sides of the outermost circle of the elastic member 181, the stability of the installation of the elastic member 181 can be improved, making it difficult for the elastic member 181 to separate from the thrust ring body 11 when subjected to an overturning moment.

[0068] In order to further improve the connection strength between the elastic member 181 and the thrust ring body 11, a cylindrical mounting groove 19 is formed on the side wall of the thrust ring body 11. The mounting groove 19 is coaxial with the slot 17 and the two form a stepped shape. The mounting groove 19 is used to accommodate the outermost circle of the spring end.

[0069] Preferably, the groove depth of the mounting groove 19 is smaller than the wire diameter of the spring. When installing the spring, a part of the outermost circle of the spring end is installed in the mounting groove 19, which means that the other part of the outermost circle of the spring end is exposed outside the notch of the mounting groove 19. When the clamping plate 182 is used to compress the outermost circle of the spring end, the clamping plate 182 is pressed on the part of the outermost circle of the spring end exposed outside the notch of the mounting groove 19, so that when the spring is deformed, the outermost circle of the spring end can still maintain a relatively stable connection with the thrust ring body 11.

[0070] Preferably, locking member 183 is a screw that passes through compression plate 182 and is tightened against the side wall of thrust ring body 11. Furthermore, a placement groove 20 is formed in the side wall of thrust ring body 11, with the bottom of placement groove 20 parallel to the side wall of thrust ring body 11. After casting thrust ring body 11, placement groove 20 is milled separately, resulting in a smoother bottom and less surface roughness than the side wall of thrust ring body 11. This allows for smoother installation of compression plate 182 and better compression of elastic member 181.

[0071] The implementation principle of the embodiment of this application is:

[0072] When the actuator is switched from the automatic state to the manual state, the switching handle assembly 9 is used to push the thrust ring body 11 to move. The thrust ring body 11 acts on the coupling 7 and pushes the coupling 7 to move toward the handwheel 5 until the first engaging portion is engaged with the handwheel 5. At this time, the second engaging portion of the coupling 7 is completely disengaged from the worm gear 4, and the switching handle assembly 9 is engaged with the worm gear 4. In this state, the handwheel 5 can be turned to drive the output shaft 3 to rotate using the coupling 7;

[0073] When the actuator is switched from manual mode to automatic mode, by starting the motor 2, the motor 2 drives the worm gear 4 to rotate, and the engagement between the worm gear 4 and the switching handle assembly 9 is released. At this time, the compression spring 10 pushes the coupling 7 to move toward the worm gear 4, and the coupling 7 drives the thrust ring to move axially synchronously until the second engaging portion of the coupling 7 engages with the worm gear 4. When the first engaging portion is completely disengaged from the handwheel 5, the switching from the manual mode to the automatic mode is completely completed.

[0074] In the process of the above-mentioned coupling 7 moving toward the worm gear 4 under the action of the compression spring 10, when the second engaging portion just starts to engage with the worm gear 4, the coupling 7 immediately rotates with the worm gear 4, and at the same time, the coupling 7 still moves toward the direction of the worm gear 4. In this state, the thrust ring still moves synchronously with the coupling 7; due to the limitation of the ejector pin 8, the thrust ring will not rotate, and only move axially along the output shaft 3. At the same time, under the cover of the elastic member 181, the ejector pin 8 can always remain in the slot 17 of the thrust ring body 11 and will not be separated from the thrust ring body 11.

[0075] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. A thrust ring with a push pin anti-drop mechanism, characterized in that: The invention comprises a thrust ring body (11), wherein a slot (17) for inserting an end portion of a push pin (8) is formed on one side of the thrust ring body (11), and an arc-shaped protrusion (12) for abutting against a side wall of a coupling (7) is formed on the other side of the thrust ring body (11). The push pin anti-slip mechanism (18) comprises an elastic member (181), wherein the elastic member (181) is used to be sleeved on the outside of the push pin (8), and one end of the elastic member (181) is fixed to the side wall of the thrust ring body (11) and is covered in the notch of the slot (17).

2. A thrust ring with a push pin anti-slip mechanism according to claim 1, characterized in that: The elastic member (181) is a spring.

3. The thrust ring with a ejector pin anti-dropout mechanism according to claim 1, characterized in that: The ejector pin anti-slip mechanism (18) further includes a pressing piece (182) and a locking piece (183), wherein the locking piece (183) is used to fasten the pressing piece (182) to the thrust ring body (11), and the pressing piece (182) is pressed against the outermost circle of the end of the elastic piece (181), so that the outermost circle of the end of the elastic piece (181) is fixed to the thrust ring body (11).

4. A thrust ring with a ejector pin anti-dropout mechanism according to claim 3, characterized in that: The number of the compression plates (182) is two, and the two compression plates (182) are respectively located on both sides of the outermost circle of the end of the elastic member (181), and the two compression plates (182) are symmetrically arranged about the axis of the elastic member (181).

5. The thrust ring with a push pin anti-drop mechanism according to claim 1, characterized in that: A mounting groove (19) is formed on the side wall of the thrust ring body (11), the mounting groove (19) and the slot (17) form a stepped shape, and the outermost ring portion of the end of the elastic member (181) is located in the mounting groove (19).

6. The thrust ring with a ejector pin anti-dropout mechanism according to claim 3, characterized in that: The locking member (183) is a screw, and the locking member (183) passes through the pressing plate (182) and is tightened on the thrust ring body (11).

7. A switching device, characterized in that: A thrust ring with a push pin anti-slip mechanism as claimed in any one of claims 1 to 6, further comprising a coupling (7) and a compression spring (10) sleeved on an output shaft (3), a push pin (8) inserted into a slot (17) of a thrust ring body (11), and a switching handle assembly (9) for pushing the thrust ring body (11) to move and engaging with a worm gear (4); The coupling (7) slides axially along the output shaft (3) and is circumferentially limited with the output shaft (3); one end of the coupling (7) is provided with a first clamping portion for clamping with the hand wheel (5); the other end of the coupling (7) is provided with a second clamping portion for clamping with the worm gear (4); the compression spring (10) abuts against one side of the coupling (7) located at the first clamping portion; the arc-shaped protrusion (12) of the thrust ring body (11) abuts against one side of the coupling (7) located at the second clamping portion; and the end of the ejector pin (8) away from the thrust ring body (11) is used to be inserted into the actuator housing (1).

8. A switching device according to claim 7, characterized in that: The switching handle assembly (9) comprises a rotating handle (91) rotatably mounted on the actuator housing (1), a shifting block (92) for abutting against the side wall of the thrust ring body (11), a clamping block (93) for clamping with the worm gear (4), and a reset coil spring (94) mounted on the rotating handle (91), wherein an outer end of the reset coil spring (94) is clamped with the actuator housing (1), and an inner end of the reset coil spring (94) is clamped with the outer wall of the rotating handle (91), the shifting block (92) is fixedly mounted on the rotating handle (91) and rotates synchronously with the rotating handle (91), and the clamping block (93) is fixedly mounted on a side of the shifting block (92) close to the worm gear (4).

9. A switching device according to claim 8, characterized in that: The coupling (7) comprises a sliding sleeve (71) sleeved on the output shaft (3) and a retaining ring (72) formed at the end of the sliding sleeve (71); the inner wall of the sliding sleeve (71) is formed with a slider (13) that slidably cooperates with a sliding groove axially opened on the output shaft (3); the first clamping portion comprises a stopper (14) arranged on the side of the retaining ring (72) close to the handwheel (5); the second clamping portion comprises a retaining column (15) arranged on the side of the sliding sleeve (71) close to the worm gear (4); and the arc-shaped protrusion (12) of the thrust ring abuts against the side wall of the retaining ring (72).

10. An electric actuator, characterized in that: A switching device according to any one of claims 7 to 9, further comprising an actuator housing (1) for mounting the switching device, a motor (2) fixedly mounted in the actuator housing (1), an output shaft (3) rotatably mounted on the actuator housing (1), a worm gear (4) and a handwheel (5) rotatably mounted on the output shaft (3), and a worm (6) rotatably mounted in the actuator housing (1), wherein the worm gear (4) is meshed with the worm (6), the handwheel (5) is located outside the actuator housing (1), and the worm (6) and the rotating shaft of the motor (2) are coupled and driven by a helical gear set.

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