Automatic and manual safety switching device of valve actuating mechanism

Abstract

The invention discloses an automatic and manual safety switching device of a valve actuating mechanism, which comprises a shell, a main shaft is rotatably arranged in the shell, an automatic clamping piece, a manual clamping piece and a controller are arranged on the outer wall of the shell, and a trigger switch electrically connected with the controller is arranged on the manual clamping piece; the automatic driving mechanism is used for automatically driving the main shaft to rotate, and the automatic driving mechanism is electrically connected with the controller; a rotating boss rotatable together with the main shaft; the manual driving mechanism can be combined with or separated from the rotating shaft sleeve; the switching handle assembly is used for pushing the rotating shaft sleeve to move towards the manual driving mechanism so that the rotating shaft sleeve can be combined with the manual driving mechanism to achieve a manual driving mode of the main shaft, or pushing the rotating shaft sleeve to be away from the manual driving mechanism so that the rotating shaft sleeve can be separated from the manual driving mechanism to achieve an automatic driving mode of the main shaft. The device can realize safe, simple and efficient switching between automatic operation and manual operation.

Description

Technical Field

[0001] The present invention relates to the technical field of valve driving devices, and more particularly to an automatic and manual safety switching device for a valve actuator. Background Art

[0002] Electric valve actuators are machines that use electricity as the main energy source to drive valve movements. Valve actuators are generally equipped with a manual mode, which is used to switch the valve actuator to manual mode when the electric actuator part is unavailable or in an emergency, so that the valve can be manually controlled.

[0003] At present, manufacturers of intelligent electric actuators generally adopt the following two methods for electric and manual switching: one is to use differential planetary gear transmission to achieve electric and manual switching. This switching mechanism is too complicated and is not conducive to the processing and assembly of the actuator. The other is to achieve electric and manual switching by hand. In this method, power is suddenly supplied during manual operation, and the motor drives the spindle to rotate, causing the handwheel to rotate, which is easy to cause personal injury.

[0004] Therefore, how to provide a safe, simple and efficient automatic and manual safety switching device for a valve actuator is a problem that technical personnel in this field need to solve urgently. Summary of the invention

[0005] In view of this, the present invention provides a safe, simple and efficient automatic and manual safety switching device for a valve actuator.

[0006] In order to achieve the above object, the present invention adopts the following technical solution:

[0007] An automatic and manual safety switching device for a valve actuator, comprising:

[0008] A housing, wherein a main shaft for driving the valve to open and close is rotatably installed inside the housing, an automatic positioning member, a manual positioning member, and a controller are respectively installed on the outer wall of the housing, and a trigger switch electrically connected to the controller is provided on the manual positioning member;

[0009] An automatic driving mechanism, which is arranged on the housing and is used to automatically drive the spindle to rotate, and the automatic driving mechanism is electrically connected to the controller;

[0010] A rotating sleeve, which is slidably mounted on the main shaft and can rotate together with the main shaft;

[0011] A manual drive mechanism, the manual drive mechanism is arranged on the housing, and the manual drive mechanism and the rotating sleeve can be combined or separated;

[0012] a switching handle assembly, the switching handle assembly being rotatably mounted on the housing and used for pushing the rotating shaft sleeve toward the manual drive mechanism so that the rotating shaft sleeve is combined with the manual drive mechanism to realize the manual drive mode of the spindle, or pushing the rotating shaft sleeve away from the manual drive mechanism so that the rotating shaft sleeve is separated from the manual drive mechanism to realize the automatic drive mode of the spindle;

[0013] When in manual drive mode, the switching handle assembly is engaged with the manual locking member and triggers the trigger switch to generate a first electrical signal, and the controller disconnects the power supply of the automatic drive mechanism according to the first electrical signal; when in automatic drive mode, the switching handle assembly is disengaged from the trigger switch and engaged with the automatic locking member, the trigger switch generates a second electrical signal, and the controller connects the power supply of the automatic drive mechanism according to the second electrical signal.

[0014] It can be known from the above technical solutions that, compared with the prior art, the present invention discloses an automatic and manual safety switching device for a valve actuator. When the actuator can be powered normally, the switching handle assembly is clamped on the automatic clamping piece. At this time, the rotating sleeve is separated from the manual drive mechanism and cannot be connected by transmission, that is, the manual drive mechanism cannot work, while the automatic drive mechanism can work normally, so that the automatic drive mechanism drives the main shaft to complete the rotation action, thereby realizing the automatic opening or closing operation of the valve; when the actuator encounters a power failure, first, the switching handle assembly is clamped on the manual clamping piece. At this time, the rotating sleeve is combined with the manual drive mechanism for transmission connection. The staff drives the rotating sleeve to rotate by operating the manual drive mechanism, and the rotating sleeve drives the main shaft to complete the rotation action, thereby realizing the manual opening and closing operation of the valve. At the same time, the switching handle assembly will contact the trigger switch, so that the trigger switch generates a first electrical signal, and the controller disconnects the power supply of the automatic drive mechanism according to the first electrical signal, so as to avoid the automatic drive mechanism suddenly being powered on during manual operation, causing the automatic drive mechanism to drive the main shaft to rotate, thereby causing the manual drive mechanism to rotate by itself, and then the rotating manual drive mechanism causes harm to the personnel who are operating the manual drive mechanism. When the valve is manually opened or closed and the actuator can be powered normally, the switching handle assembly is re-engaged in the automatic locking member. At this time, the switching handle assembly is disengaged from the trigger switch, and the trigger switch generates a second electrical signal. The controller connects the power supply of the automatic drive mechanism according to the second electrical signal, and then the automatic driving mechanism is used again to realize the automatic closing or opening of the valve.

[0015] Therefore, the device can achieve efficient switching between electric and manual states by switching the handle assembly during emergency power failure, realize the opening and closing of the valve by manual operation, and prevent accidents. During the operation, the automatic and manual locking parts can position the switching handle assembly to avoid misoperation by personnel during the operation; at the same time, due to the control of the trigger switch, the safety of personnel in the manual operation of the valve is ensured.

[0016] Furthermore, the automatic driving mechanism comprises:

[0017] A driving motor, wherein the driving motor is fixed to the housing and is electrically connected to the controller;

[0018] A first worm gear, wherein the first worm gear is rotatably mounted inside the housing, and one end of the first worm gear is fixedly connected to a driving shaft of the driving motor;

[0019] A first worm wheel is sleeved on the main shaft and is meshingly connected with the first worm.

[0020] The beneficial effects of the above technical solution are as follows: in the automatic mode, the drive motor drives the first worm to rotate, the first worm drives the first worm wheel to rotate, and the first worm wheel drives the main shaft to rotate, thereby realizing the automatic rotation operation of the main shaft through the drive motor. In addition, when the switching handle assembly is engaged with the manual engaging member, it contacts the trigger switch, causing the trigger switch to generate a first electrical signal, and the controller disconnects the power supply of the drive motor according to the first electrical signal, thereby preventing the drive motor from being suddenly energized during manual operation, causing the drive motor to work and causing the manual drive mechanism to rotate automatically, thereby causing personal injury.

[0021] Furthermore, the manual drive mechanism comprises:

[0022] a second worm, the second worm being rotatably mounted on the housing, and a hand wheel being fixed at one end of the second worm;

[0023] A second worm wheel, the second worm wheel is sleeved on the main shaft, the second worm wheel is meshingly connected with the second worm, a first shifting cam is fixed on one side surface of the second worm wheel, a second shifting cam is fixed on one side surface of the rotating sleeve, and the first shifting cam is shiftingly connected with the second shifting cam.

[0024] The beneficial effect produced by adopting the above technical scheme is: in manual mode, the operator turns the handwheel to drive the second worm to rotate, the second worm drives the second worm wheel to rotate, the first shifting cam on the second worm wheel shifts the second shifting cam on the rotating sleeve, thereby rotating the rotating sleeve, and the rotating sleeve drives the main shaft to rotate, and then the manual rotation operation of the main shaft is realized by the handwheel.

[0025] Furthermore, a plurality of toggle grooves are circumferentially provided on the shaft wall of the main shaft, a plurality of toggle convex bands are circumferentially provided on the hole wall of the inner sleeve hole of the rotating sleeve, and the plurality of toggle convex bands are slidably connected with the plurality of toggle grooves in a one-to-one corresponding manner.

[0026] The beneficial effect of adopting the above technical solution is that the setting of the toggle cam and the toggle groove can not only enable the rotating sleeve to slide stably on the main shaft, thereby realizing the precise combination or separation of the rotating sleeve and the second worm gear, but also can realize the rotation operation of the main shaft in manual mode by the rotating sleeve driving the main shaft to rotate by itself with the cooperation of the toggle cam and the toggle groove.

[0027] Furthermore, the main shaft is provided with a first shaft section and a second shaft section with successively increasing shaft diameters, the first worm gear is sleeved on the second shaft section, the second worm gear is sleeved on the first shaft section, a plurality of the toggle slide grooves are provided on the outer circumference of the second shaft section, and the switching handle assembly includes:

[0028] A rotating rod, the rotating rod is rotatably mounted on the housing, one end of the rotating rod extends out of the housing, the other end of the rotating rod extends into the housing, and is located on the other side of the rotating sleeve;

[0029] A switching handle rod, one end of which is fixedly connected to one end of the rotating rod, the switching handle rod is engaged with the automatic locking member or the manual locking member, and the switching handle rod can contact the trigger switch;

[0030] A cam, wherein the top end of the cam is fixedly connected to the other end of the rotating rod, and the convex end of the cam can contact the other side surface of the rotating sleeve to push the rotating sleeve to move toward the second worm gear, so that the first toggle convex tooth is toggle-connected with the second toggle convex tooth to realize the manual driving mode of the main shaft;

[0031] A spring, wherein the spring is sleeved on the first shaft segment, one end of the spring abuts against the stop boss on the second worm gear, and the other end abuts against the right shoulder of the first shaft segment. When the pushing side end face of the toggle cam slides out of the toggle slot, the pushing side end face pushes the other end of the spring to compress the spring. When the cam end is disengaged from the other side face of the rotating sleeve, the spring pushes the rotating sleeve to move in a direction away from the second worm gear.

[0032] The beneficial effects of the above technical solution are as follows: when in automatic mode, the switching handle rod is clamped on the automatic clamping member, at this time, the convex end of the cam is away from the rotating sleeve, and the rotating sleeve moves to the left under the action of the spring, thereby separating the rotating sleeve from the second worm gear, that is, the first toggle convex tooth and the second toggle convex tooth are in an uncombined toggle state, and the automatic rotation of the main shaft can be achieved by the driving motor in this mode; when it is necessary to be in manual mode, the operator turns the switching handle rod to clamp it on the manual clamping member, at this time, the convex end of the cam contacts the rotating sleeve and pushes the rotating sleeve to the right, and the rotating sleeve compresses the spring when it moves, and the rotating sleeve is combined with the second worm gear, that is, the first toggle convex tooth and the second toggle convex tooth are in a combined toggle state, and then, in this mode, the manual rotation of the main shaft can be achieved by the handwheel. At the same time, the switching handle rod contacts the trigger switch, so that the trigger switch generates a first electrical signal, and the controller disconnects the power supply of the driving motor according to the first electrical signal, so as to avoid the driving motor being suddenly powered on during manual operation, causing the driving motor to work and causing the handwheel to rotate automatically, thereby causing personal injury.

[0033] Furthermore, a limiting flange is provided on the second shaft section, and when the spring pushes the rotating sleeve to move in a direction away from the second worm gear, the stop side end surface of the shifting cam is stopped on the limiting flange.

[0034] The beneficial effect of adopting the above technical solution is that the limiting flange can limit the displacement of the rotating sleeve, that is, when the rotating sleeve is stopped on the limiting flange, the rotating sleeve and the cam can just be in a contact state, so that when the cam rotates, it can just push the rotating sleeve closer to the second worm gear, which can greatly reduce the idle stroke of the rotating sleeve and improve operating efficiency.

[0035] Furthermore, the automatic positioning member includes:

[0036] A first fixing seat, wherein the first fixing seat is fixed on the top surface of the shell;

[0037] A first snap plate, the first snap plate being rotatably connected to the first fixing seat, and the first snap plate being provided with a first snap opening for snapping with the switching handle rod;

[0038] The manual positioning member comprises:

[0039] a second fixing seat, the second fixing seat being fixed on the top surface of the housing, and the trigger switch being mounted on the second fixing seat;

[0040] The second snap plate is rotatably connected to the second fixing seat, and the second snap plate is provided with a second snap opening for snapping with the switching handle rod.

[0041] The beneficial effect of adopting the above technical solution is that the switch handle rod can be positioned and fixed by the first snap plate and the second snap plate, so that the switch handle rod is fixed in position in the automatic or manual mode, avoiding the danger of misoperation.

[0042] Furthermore, a third worm gear is mounted on the main shaft, a feedback worm is rotatably mounted on the housing and an angle encoder is fixed thereon, the feedback worm is meshingly connected to the third worm gear, and a rotating shaft of the angle encoder is fixedly connected to one end of the feedback worm for detecting the rotation angle of the main shaft.

[0043] The beneficial effect produced by adopting the above technical scheme is: the rotation of the main shaft drives the third worm wheel to rotate, and then the third worm wheel drives the third worm to rotate, and the third worm drives the rotating shaft of the angle encoder to rotate, and then the rotation angle of the main shaft can be detected by the angle encoder, so that the staff can monitor the opening and closing status of the valve and the opening size of the valve in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0045] Figure 1 A schematic diagram of the internal structure of an automatic and manual safety switching device for a valve actuator provided by the present invention.

[0046] Figure 2 It is a schematic diagram of the switching handle assembly and the automatic locking member being engaged in the automatic state.

[0047] Figure 3 It is a schematic diagram of the switching handle assembly and the manual locking member being engaged in the manual state.

[0048] Figure 4 A schematic diagram of the external three-dimensional structure of an automatic and manual safety switching device for a valve actuator provided by the present invention.

[0049] Figure 5 It is a schematic diagram of the first perspective when the second worm and the second worm wheel are transmitting.

[0050] Figure 6 It is a schematic diagram of a second viewing angle when the second worm and the second worm wheel are transmitting.

[0051] Figure 7 It is a schematic diagram of the present invention after the housing is hidden.

[0052] Figure 8It is a schematic diagram of the first shifting protruding tooth and the second shifting protruding tooth from a first viewing angle.

[0053] Fig. 9 It is a schematic diagram of the first shifting protruding tooth and the second shifting protruding tooth from a second viewing angle.

[0054] Fig.10 It is a schematic diagram of the first viewing angle when one side sleeve end of the rotating sleeve stops on the limiting flange.

[0055] Fig.11 It is a schematic diagram of a second viewing angle when one side sleeve end of the rotating sleeve stops on the limiting flange. DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0057] See also Figure 1-Figure 11 The embodiment of the present invention discloses an automatic and manual safety switching device for a valve actuator, comprising:

[0058] A housing 1, a main shaft 2 for driving the valve to open and close is rotatably installed inside the housing 1, an automatic positioning member 3, a manual positioning member 4, and a controller are respectively installed on the outer wall of the housing 1, and a trigger switch 5 electrically connected to the controller is provided on the manual positioning member 4;

[0059] An automatic driving mechanism 6, which is arranged on the housing 1 and is used to automatically drive the main shaft 2 to rotate. The automatic driving mechanism 6 is electrically connected to the controller;

[0060] The rotating sleeve 7 is slidably sleeved on the main shaft 2 and can rotate together with the main shaft 2;

[0061] A manual drive mechanism 8, which is disposed on the housing 1, and can be combined with or separated from the rotating sleeve 7;

[0062] A switching handle assembly 9, which is rotatably mounted on the housing 1 and is used to push the rotating sleeve 7 to move toward the manual drive mechanism 8 so that the rotating sleeve 7 is combined with the manual drive mechanism 8 to realize the manual drive mode of the main shaft 2, or to push the rotating sleeve 7 away from the manual drive mechanism 8 so that the rotating sleeve 7 is separated from the manual drive mechanism 8 to realize the automatic drive mode of the main shaft 2;

[0063] When in manual drive mode, the switching handle assembly 9 is engaged with the manual locking member 4, and triggers the trigger switch 5 to generate a first electrical signal, and the controller disconnects the power supply of the automatic drive mechanism 6 according to the first electrical signal; when in automatic drive mode, the switching handle assembly 9 is disengaged from the trigger switch 5 and engaged with the automatic locking member 3, the trigger switch 5 generates a second electrical signal, and the controller connects the power supply of the automatic drive mechanism 6 according to the second electrical signal.

[0064] In a specific embodiment, the automatic driving mechanism 6 includes:

[0065] A driving motor, which is fixed on the housing 1 and electrically connected to the controller;

[0066] A first worm 61, the first worm 61 is rotatably mounted inside the housing 1, and one end of the first worm 61 is fixedly connected to the driving shaft of the driving motor;

[0067] The first worm gear 62 is sleeved on the main shaft 2 and is meshingly connected with the first worm 61 .

[0068] The manual drive mechanism 8 comprises:

[0069] A second worm 81, which is rotatably mounted on the housing 1, and a hand wheel 82 is fixed at one end of the second worm 81;

[0070] The second worm gear 83 is sleeved on the main shaft 2, and the second worm gear 83 is meshingly connected with the second worm 81. A first shifting cam 831 is fixed on one side surface of the second worm gear 83, and a second shifting cam 71 is fixed on one side surface of the rotating shaft sleeve 7. The first shifting cam 831 is shiftingly connected with the second shifting cam 71.

[0071] A plurality of toggle slots 201 are circumferentially formed on the shaft wall of the main shaft 2 , and a plurality of toggle convex strips 72 are circumferentially formed on the hole wall of the inner sleeve hole of the rotating shaft sleeve 7 . The plurality of toggle convex strips 72 are slidably connected with the plurality of toggle slots 201 in a one-to-one corresponding manner.

[0072] The main shaft 2 is provided with a first shaft section 21 and a second shaft section 22 with increasing shaft diameters in sequence, the first worm gear 62 is sleeved on the second shaft section 22, the second worm gear 83 is sleeved on the first shaft section 21, and a plurality of toggle slide grooves 201 are provided on the outer periphery of the second shaft section 22. The switching handle assembly 9 includes:

[0073] A rotating rod 91, the rotating rod 91 is rotatably mounted on the housing 1, one end of the rotating rod 91 extends out of the housing 1, and the other end extends into the interior of the housing 1 and is located on the other side of the rotating shaft sleeve 7;

[0074] A switching handle rod 92, one end of which is fixedly connected to one end of the rotating rod 91, the switching handle rod 92 is engaged with the automatic clamping member 3 or the manual clamping member 4, and the switching handle rod 92 can contact the trigger switch;

[0075] The cam 93, the top end of the cam 93 is fixedly connected to the other end of the rotating rod 91, and the convex end 931 of the cam 93 can contact the other side of the rotating sleeve 7 to push the rotating sleeve 7 to move toward the second worm gear 83, so that the first toggle convex tooth 831 and the second toggle convex tooth 71 are toggle-connected to realize the manual driving mode of the main shaft 2;

[0076] Spring 94, spring 94 is sleeved on the first shaft section 21, one end of the spring 94 abuts against the stop boss 10 on the second worm gear 83, and the other end abuts against the right shoulder 221 of the first shaft section 21. When the pushing side end face 721 of the cam belt 72 slides out of the cam groove 201, the pushing side end face 721 pushes the other end of the spring 94 to compress the spring 94. When the cam end 931 disengages from the other side of the rotating sleeve 7, the spring 94 pushes the rotating sleeve 7 to move in the direction away from the second worm gear 83.

[0077] A limiting flange 222 is provided on the second shaft section 22 . When the spring 94 pushes the rotating sleeve 7 to move away from the second worm gear 83 , the stopping side end surface 722 of the moving convex belt 72 stops on the limiting flange 222 .

[0078] The automatic positioning member 3 comprises:

[0079] A first fixing seat 31, the first fixing seat 31 is fixed on the top surface of the housing 1;

[0080] A first snap plate 32, the first snap plate 32 is rotatably connected to the first fixing seat 31, and the first snap plate 32 is provided with a first snap opening 321 for snapping with the switching handle rod 92;

[0081] The manual positioning member 4 comprises:

[0082] A second fixing base 41, the second fixing base 41 is fixed on the top surface of the housing 1, and the trigger switch 5 is mounted on the second fixing base 41;

[0083] The second snap plate 42 is rotatably connected to the second fixing seat 41 . The second snap plate 42 is provided with a second snap opening 421 which is snapped to the switching handle rod 92 .

[0084] A third worm gear 11 is mounted on the main shaft 2, a feedback worm 12 and an angle encoder are rotatably mounted on the housing 1, the feedback worm 12 is meshingly connected to the third worm gear 11, and the rotating shaft of the angle encoder is fixedly connected to one end of the feedback worm 12 for detecting the rotation angle of the main shaft 2.

[0085] This device can realize automatic and manual drive rotation of the main shaft, and then realize automatic and manual opening or closing operation of the valve. The specific process is as follows:

[0086] Automatic mode (the device is not powered off and can be powered normally): the switch handle rod is locked on the first locking opening of the first locking plate. At this time, the convex end of the cam is away from the rotating sleeve, and the rotating sleeve moves to the left under the action of the spring, thereby separating the rotating sleeve from the second worm gear, that is, the first toggle convex tooth and the second toggle convex tooth are in an uncoupled toggle state. In this mode, the automatic rotation of the main shaft can be achieved by driving the motor;

[0087] Manual mode (the device cannot be powered normally due to power failure): Turn the switching handle rod to make it snap on the second snap plate. At this time, the convex end of the cam pushes the rotating sleeve to the right. When the rotating sleeve moves, the spring is compressed, and the rotating sleeve is combined with the second worm gear, that is, the first toggle convex tooth and the second toggle convex tooth are in a combined toggle state. After that, the manual rotation of the main shaft can be achieved by the handwheel in this mode. At the same time, the switching handle rod contacts the trigger switch, causing the trigger switch to generate a first electrical signal. The controller disconnects the power supply of the drive motor according to the first electrical signal to avoid the drive motor being suddenly powered on during manual operation, causing the drive motor to work and cause the handwheel to rotate automatically, thereby causing personal injury.

[0088] When the valve is manually opened or closed and the device is able to supply power normally, the switching handle rod is re-positioned to the first positioning port. At this time, the switching handle rod is disengaged from the trigger switch, and the trigger switch generates a second electrical signal. The controller connects the power supply of the drive motor according to the second electrical signal, and then the valve is automatically closed or opened by the drive motor again.

[0089] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0090] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An automatic and manual safety switching device for a valve actuator, characterized in that: include: A housing (1), wherein a main shaft (2) for driving the valve to open and close is rotatably mounted inside the housing (1), an automatic locking member (3), a manual locking member (4), and a controller are respectively mounted on the outer wall of the housing (1), and the manual locking member (4) is provided with a trigger switch (5) electrically connected to the controller; an automatic driving mechanism (6), the automatic driving mechanism (6) being arranged on the housing (1) and used for automatically driving the main shaft (2) to rotate, the automatic driving mechanism (6) being electrically connected to the controller; A rotating sleeve (7), wherein the rotating sleeve (7) is slidably sleeved on the main shaft (2) and can rotate together with the main shaft (2); A manual drive mechanism (8), wherein the manual drive mechanism (8) is arranged on the housing (1), and the manual drive mechanism (8) and the rotating shaft sleeve (7) can be combined or separated; a switching handle assembly (9), the switching handle assembly (9) being rotatably mounted on the housing (1) and being used for pushing the rotating shaft sleeve (7) to move toward the manual drive mechanism (8) so that the rotating shaft sleeve (7) is combined with the manual drive mechanism (8) to realize the manual drive mode of the main shaft (2), or pushing the rotating shaft sleeve (7) away from the manual drive mechanism (8) so that the rotating shaft sleeve (7) is separated from the manual drive mechanism (8) to realize the automatic drive mode of the main shaft (2); When in the manual drive mode, the switching handle assembly (9) is engaged with the manual locking member (4) and triggers the trigger switch (5) to generate a first electrical signal, and the controller disconnects the power supply of the automatic drive mechanism (6) according to the first electrical signal; when in the automatic drive mode, the switching handle assembly (9) is disengaged from the trigger switch (5) and engaged with the automatic locking member (3), the trigger switch (5) generates a second electrical signal, and the controller connects the power supply of the automatic drive mechanism (6) according to the second electrical signal.

2. According to claim 1, an automatic and manual safety switching device for a valve actuator is characterized in that: The automatic driving mechanism (6) comprises: A drive motor, the drive motor is fixed on the housing (1), and the drive motor is electrically connected to the controller; a first worm (61), the first worm (61) being rotatably mounted inside the housing (1), one end of the first worm (61) being fixedly connected to a driving shaft of the driving motor; A first worm wheel (62), wherein the first worm wheel (62) is sleeved on the main shaft (2), and the first worm wheel (62) is meshingly connected with the first worm (61).

3. The automatic and manual safety switching device of a valve actuator according to claim 2, characterized in that: The manual drive mechanism (8) comprises: a second worm (81), the second worm (81) being rotatably mounted on the housing (1), and a hand wheel (82) being fixed to one end of the second worm (81); A second worm gear (83), the second worm gear (83) is sleeved on the main shaft (2), the second worm gear (83) is meshingly connected with the second worm (81), a first shifting convex tooth (831) is fixed on one side surface of the second worm gear (83), a second shifting convex tooth (71) is fixed on one side surface of the rotating shaft sleeve (7), and the first shifting convex tooth (831) is shiftingly connected with the second shifting convex tooth (71).

4. The automatic and manual safety switching device of a valve actuator according to claim 3, characterized in that: A plurality of toggle slide grooves (201) are circumferentially provided on the shaft wall of the main shaft (2), a plurality of toggle convex strips (72) are circumferentially provided on the hole wall of the inner sleeve hole of the rotating shaft sleeve (7), and the plurality of toggle convex strips (72) are slidably connected with the plurality of toggle slide grooves (201) in a one-to-one corresponding manner.

5. The automatic and manual safety switching device of a valve actuator according to claim 4, characterized in that: The main shaft (2) is provided with a first shaft section (21) and a second shaft section (22) with shaft diameters increasing in sequence, the first worm gear (62) is sleeved on the second shaft section (22), the second worm gear (83) is sleeved on the first shaft section (21), a plurality of the toggle slide grooves (201) are provided on the outer periphery of the second shaft section (22), and the switching handle assembly (9) comprises: a rotating rod (91), the rotating rod (91) being rotatably mounted on the housing (1), one end of the rotating rod (91) extending out of the housing (1), the other end of the rotating rod (91) extending into the interior of the housing (1) and being located on the other side of the rotating shaft sleeve (7); A switching handle rod (92), one end of which is fixedly connected to one end of the rotating rod (91), the switching handle rod (92) is engaged with the automatic locking member (3) or the manual locking member (4), and the switching handle rod (92) can contact a trigger switch; A cam (93), the top end of which is fixedly connected to the other end of the rotating rod (91), and the convex end (931) of the cam (93) can contact the other side of the rotating sleeve (7) to push the rotating sleeve (7) to move toward the second worm gear (83), so that the first shifting convex tooth (831) and the second shifting convex tooth (71) are shifted and connected to realize the manual driving mode of the main shaft (2); A spring (94), wherein the spring (94) is sleeved on the first shaft section (21), one end of the spring (94) abuts against the stop boss (10) on the second worm gear (83), and the other end abuts against the right shoulder (221) of the first shaft section (21); when the pushing side end surface (721) of the shifting convex belt (72) slides out of the shifting slide groove (201), the pushing side end surface (721) pushes the other end of the spring (94) to compress the spring (94); when the convex end (931) is disengaged from the other side surface of the rotating shaft sleeve (7), the spring (94) pushes the rotating shaft sleeve (7) to move in a direction away from the second worm gear (83).

6. The automatic and manual safety switching device of a valve actuator according to claim 5, characterized in that: A limiting flange (222) is provided on the second shaft section (22). When the spring (94) pushes the rotating sleeve (7) to move in a direction away from the second worm gear (83), the stop side end surface (722) of the shifting convex belt (72) stops on the limiting flange (222).

7. An automatic and manual safety switching device for a valve actuator according to claim 5 or 6, characterized in that: The automatic positioning member (3) comprises: A first fixing seat (31), wherein the first fixing seat (31) is fixed on the top end surface of the shell (1); A first snap plate (32), the first snap plate (32) being rotatably connected to the first fixing seat (31), and the first snap plate (32) being provided with a first snap opening (321) for snapping with the switching handle rod (92); The manual locking member (4) comprises: a second fixing seat (41), the second fixing seat (41) being fixed on the top end surface of the housing (1), and the trigger switch (5) being mounted on the second fixing seat (41); A second snap plate (42), wherein the second snap plate (42) is rotatably connected to the second fixing seat (41), and the second snap plate (42) is provided with a second snap opening (421) for snapping with the switching handle rod (92).

8. An automatic and manual safety switching device for a valve actuator according to claim 5 or 6, characterized in that: The main shaft (2) is sleeved with a third worm gear (11); a feedback worm (12) and an angle encoder are rotatably mounted on the housing (1); the feedback worm (12) is meshingly connected to the third worm gear (11); the rotating shaft of the angle encoder is fixedly connected to one end of the feedback worm (12) for detecting the rotation angle of the main shaft (2).

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