Manual operation mechanism with power-off function

Abstract

The utility model relates to a manual operation mechanism with a power-off function, which belongs to the technical field of electric actuators and comprises a base, a manual shaft, a hand wheel, a clamping piece and an elastic piece. A circumferential limiting block is arranged at one end of the manual shaft, and a first clamping groove and a second clamping groove are formed in the outer wall of the manual shaft; the clamping piece is acted by the elastic piece and abuts against the circumferential wall of the manual shaft, and a transmission shaft of the electric actuator is provided with a circumferential limiting groove matched with the circumferential limiting block. When the circumferential limiting block is inserted into the circumferential limiting groove, the clamping piece is clamped into the first clamping groove, the power-off push rod slides into the manual shaft power-off limiting groove under the action of the spring, and the microswitch is switched off to cut off a motor power supply; and during separation, the clamping piece is clamped into the second clamping groove, and the power-off push rod slides out to close the microswitch. Reliable switching between a manual mode and an electric mode is achieved through a mechanical structure, the power-off protection function is achieved, operation is easy and convenient, stability is high, misoperation is effectively avoided, and the electric actuator is suitable for various electric actuator scenes needing emergency manual control.

Description

A manual operating mechanism with power-off function Technical Field

[0001] This application relates to the technical field of electric actuators, and in particular to a manual operating mechanism with a power-off function. Background Technology

[0002] As a key actuator controlling the opening and closing of valves and the degree of opening, electric actuators are usually equipped with a manual operating mechanism to ensure their operability in the event of a power outage. When an electric actuator experiences a power failure, the manual operating mechanism allows for emergency control of the actuator's output.

[0003] Existing manual operating mechanisms typically consist of a rotating shaft, a spring fitted onto the shaft, and a handwheel mounted on the shaft. When manual operation is required, the operator pushes the handwheel, causing the slot on the rotating shaft to engage with the output shaft of the electric actuator. During this process, the spring is compressed. Then, by rotating the handwheel, the output shaft rotates, completing the manual adjustment of the valve. After operation, releasing the handwheel causes the spring to return to its original position, pushing the rotating shaft to disengage the slot from the output shaft.

[0004] However, in actual operation, the aforementioned manual operating mechanism has obvious drawbacks: the operator needs to continuously apply pressure to maintain the handwheel position, keeping the shaft slot engaged with the output shaft, while simultaneously rotating the handwheel. This operating method is not only cumbersome but also labor-intensive, reducing the efficiency and convenience of emergency operations and failing to meet the needs of practical application scenarios. Summary of the Invention

[0005] This application provides a manual operating mechanism with a power-off function to solve the technical problems of existing manual operating mechanisms being cumbersome to operate and requiring a large amount of manpower.

[0006] This application provides a manual operating mechanism with a power-off function, employing the following technical solution:

[0007] A manual operating mechanism with a power-off function includes a base, a manual shaft, a handwheel, a locking member, and an elastic member. The manual shaft passes through the base and is rotatably engaged with it. One end of the manual shaft extends into an electric actuator, and the other end is used to install the handwheel. A circumferential limiting block is provided at the end of the manual shaft extending into the electric actuator. The circumferential limiting block is used to engage with a pre-drilled circumferential limiting groove on the drive shaft of the electric actuator. A first locking groove and a second locking groove are formed axially on the outer wall of the manual shaft. The locking member and the elastic member are mounted on the housing of the electric actuator, and the locking member abuts against the circumferential wall of the manual shaft under the action of the elastic member. When the circumferential limiting block is engaged with the circumferential limiting groove, the elastic member acts on the locking member to lock the locking member into the first locking groove. When the circumferential limiting block disengages from the circumferential limiting groove, the elastic member acts on the locking member to lock the locking member into the second locking groove.

[0008] By adopting the above technical solution, and by setting up a base, manual shaft, handwheel, snap-fit ​​component, and elastic component, when the electric actuator is powered off, pushing the handwheel causes the circumferential limit block to engage with the circumferential limit groove. The snap-fit ​​component, under the action of the elastic component, snaps into the first slot. This maintains the meshing state of the manual shaft and the drive shaft without the operator needing to continuously apply pressure, simplifying the operation process, reducing manpower consumption, and improving the efficiency and convenience of emergency operation. After the manual operation is completed, pulling the manual shaft causes the circumferential limit block to disengage, and the snap-fit ​​component snaps into the second slot, facilitating the switch of the electric actuator back to electric mode and achieving reliable switching between manual and electric modes.

[0009] Preferably, a support bushing is provided at the end of the manual shaft away from the handwheel, the support bushing is fixedly installed inside the housing of the electric actuator, and the manual shaft is rotatably installed on the inner ring of the support bushing.

[0010] By adopting the above technical solution, the support bushing at the end of the manual shaft away from the handwheel is fixedly installed inside the housing of the electric actuator, and the manual shaft is rotatably installed on its inner ring. With the base, the two ends of the manual shaft are assembled, which can effectively ensure the stability of the manual shaft during rotation, reduce the shaking of the manual shaft during manual operation, make the operation more stable and precise, and extend the service life of the manual operating mechanism.

[0011] Preferably, a positioning sleeve is fitted around the elastic element, the positioning sleeve is installed in the housing of the electric actuator, the elastic element is installed inside the positioning sleeve, the snap-fit ​​member is located at the open end of the positioning sleeve, one end of the elastic element acts on the end face of the inner wall of the positioning sleeve, and the other end acts on the snap-fit ​​member.

[0012] By adopting the above technical solution, this structural design ensures the stability of the installation of the snap-fit ​​component and the elastic component, enabling the snap-fit ​​component to stably abut against the manual shaft peripheral wall under the action of the elastic component, thereby stably realizing the switching of the snap-fit ​​component between the first and second snap-fit ​​slots, and ensuring the reliability and stability of the manual and electric mode switching process.

[0013] Preferably, the snap-fit ​​component is a spherical ball bearing structure.

[0014] By adopting the above technical solution, compared with other structures, the ball bearing structure can better fit the slot, reduce the friction between the locking component and the slot, make the locking and unlocking process of the locking component smoother, and further improve the flexibility and reliability of the manual operation mechanism mode switching.

[0015] Preferably, the positioning sleeve, the elastic element, and the snap-fit ​​element are configured in multiple sets and distributed circumferentially along the manual axis on the electric actuator housing.

[0016] By adopting the above technical solution, the positioning sleeve, elastic element and snap-fit ​​element are set into multiple groups and distributed around the manual axis in the electric actuator housing. Force can be applied to the snap-fit ​​element from multiple directions to ensure the stability of manual mode switching. This avoids jamming or displacement of the manual axis due to uneven force during switching, making the manual operation mechanism more stable and reliable when switching between manual and electric modes.

[0017] Preferably, the outer wall of the positioning sleeve is formed with external threads, and the housing of the electric actuator is formed with a threaded groove, wherein the external threads of the positioning sleeve are threadedly engaged with the threaded groove of the housing of the electric actuator.

[0018] By adopting the above technical solution, the outer wall of the positioning sleeve is formed with an external thread, which is threaded to fit with the threaded groove of the electric actuator housing. By adjusting the installation depth of the positioning sleeve in the threaded groove, the compression distance of the elastic element can be adjusted, thereby changing the force exerted by the elastic element on the locking element. This allows for adjustment of the force exerted by the locking element on the first or second locking groove of the manual shaft. The clamping force of the locking element can be flexibly adjusted according to actual usage requirements, ensuring the stability of the manual shaft during push. It also facilitates the debugging and optimization of the operating mechanism under different working conditions.

[0019] Preferably, it further includes a power-off push rod and a micro switch; the electric actuator housing has a sliding groove, the power-off push rod is slidably installed in the sliding groove, the axis of the power-off push rod is perpendicular to the axis of the manual shaft, the outer peripheral wall of the manual shaft has a power-off limiting groove, and a power-off trigger spring is sleeved on the outer peripheral wall of the power-off push rod, one end of the power-off trigger spring acts on the power-off push rod, and the other end abuts against the bottom of the sliding groove; the micro switch is installed on the housing of the electric actuator and connected to the control circuit of the electric actuator;

[0020] When the circumferential limiting block is inserted into the circumferential limiting groove, the power-off push rod slides into the power-off limiting groove under the action of the power-off trigger spring, and the end of the power-off push rod away from the manual shaft disengages from the micro switch, causing the micro switch to open; when the circumferential limiting block disengages from the circumferential limiting groove, the end of the power-off push rod slides out of the power-off limiting groove and abuts against the micro switch, causing the micro switch to close.

[0021] By adopting the above technical solution, a power-off push rod and a micro switch are added. When the electric actuator switches to manual mode and the circumferential limit block is inserted into the circumferential limit groove, the power-off push rod slides into the power-off limit groove under the action of the power-off trigger spring, and the micro switch is opened. Even if the electric actuator power supply is suddenly turned on at this time, the motor cannot be powered on, realizing emergency manual operation power-off protection. This effectively avoids dangerous situations caused by staff accidentally operating the manual mechanism or operating the manual mechanism without turning off the power during maintenance, and improves the safety of using the electric actuator. When switching back to electric mode, the power-off push rod slides out of the power-off limit groove, causing the micro switch to close, and the electric actuator returns to normal electric working state, ensuring the coordination between working mode switching and circuit control.

[0022] Preferably, the base has a spring mounting groove on the side near the electric actuator housing, a buffer spring is installed in the spring mounting groove, a shoulder is provided on the manual shaft, one end of the buffer spring abuts against the bottom of the spring mounting groove, and the other end abuts against the shoulder on the manual shaft.

[0023] By adopting the above technical solution, when the manual shaft is switched to manual mode, the buffer spring is gradually released from the compressed state, relying on elastic potential energy to assist in pushing the manual shaft, reducing the operator's operating force and making the switch to manual mode easier and more convenient; when the manual mode is turned off and the manual shaft is pulled, the buffer spring is compressed, which can effectively buffer the impact force during the pulling process of the manual shaft, reduce the vibration when the manual shaft moves, ensure the smoothness of the manual shaft movement, and further improve the user experience and stability of the manual operating mechanism.

[0024] Preferably, a sealing ring is fitted on the outer peripheral wall of the base of the manual shaft, the sealing ring is embedded in the annular groove of the manual shaft, and the sealing ring abuts against the inner wall of the base; a sealing ring is also provided between the base and the housing of the electric actuator.

[0025] By adopting the above technical solution, a sealing ring is fitted on the outer peripheral wall of the base of the manual shaft, and the sealing ring abuts against the inner wall of the base. At the same time, a sealing ring is also set between the base and the housing of the electric actuator. This can effectively prevent dust, moisture and other impurities from entering the interior of the electric actuator, ensuring the sealing performance of the manual shaft installation and the sealing performance between the base and the housing of the electric actuator. It avoids the corrosion and damage of impurities to internal parts, improves the reliability and service life of the electric actuator and the manual operating mechanism, and ensures that it can work normally in harsh environments.

[0026] In summary, this application includes at least one of the following beneficial technical effects:

[0027] 1. When the electric actuator is powered off, pushing the handwheel causes the circumferential limit block to engage with the circumferential limit groove. The locking component, under the action of the elastic element, engages in the first slot, maintaining the meshing state of the manual shaft and the drive shaft without the operator needing to continuously apply pressure. This simplifies the operation process, reduces manpower consumption, and improves the efficiency and convenience of emergency operations. After manual operation is completed, pulling the manual shaft causes the circumferential limit block to disengage, and the locking component engages in the second slot, facilitating the switch of the electric actuator back to electric mode and achieving reliable switching between manual and electric modes.

[0028] 2. When the electric actuator switches to manual mode, and the circumferential limit block is inserted into the circumferential limit groove, the power-off push rod slides into the power-off limit groove under the action of the power-off trigger spring, and the micro switch is disconnected. Even if the electric actuator power supply is suddenly turned on at this time, the motor cannot be powered on, realizing emergency manual operation power-off protection. This effectively avoids dangerous situations caused by personnel accidentally operating the manual mechanism or operating the manual mechanism without turning off the power during maintenance, and improves the safety of using the electric actuator. When switching back to electric mode, the power-off push rod slides out of the power-off limit groove, causing the micro switch to close, and the electric actuator returns to normal electric working state, ensuring the coordination between working mode switching and circuit control. Attached Figure Description

[0029] Figure 1 is a schematic diagram of the disengaged state structure of the manual shaft and the drive shaft in an embodiment of this application;

[0030] Figure 2 is a schematic diagram of the meshing state structure of the manual shaft and the drive shaft in an embodiment of this application;

[0031] Figure label:

[0032] 1. Base; 2. Manual shaft; 3. Handwheel; 4. Snap-fit ​​component; 5. Elastic component; 6. Circumferential limit block; 7. Drive shaft; 8. Circumferential limit groove; 9. First slot; 10. Second slot; 11. Electric actuator housing; 12. Support bushing; 13. Positioning sleeve; 14. Power-off push rod; 15. Micro switch; 16. Sliding groove; 17. Power-off limit groove; 18. Power-off trigger spring; 19. Spring mounting groove; 20. Buffer spring; 21. Shoulder; 22. Sealing ring. Detailed Implementation

[0033] The present application will be further described in detail below with reference to Figures 1-2.

[0034] This application discloses a manual operating mechanism with a power-off function.

[0035] Referring to Figure 1, a manual operating mechanism with a power-off function includes a base 1, a manual shaft 2, a handwheel 3, a locking member 4, and an elastic member 5. The manual shaft 2 passes through the base 1 and is rotatably engaged with it. One end of the manual shaft 2 extends into the electric actuator, and the other end is used to install the handwheel 3. A circumferential limiting block 6 is provided at the end extending into the electric actuator. The circumferential limiting block 6 is used to engage with a pre-drilled circumferential limiting groove 8 on the drive shaft 7 of the electric actuator. Simultaneously, a first locking groove 9 and a second locking groove 10 are axially formed on the outer wall of the manual shaft 2. The handwheel 3 is installed at the end of the manual shaft 2 extending out of the electric actuator by a key connection or screw fixation. The locking member 4 and the elastic member 5 are installed on the housing 11 of the electric actuator, and the locking member 4 is always abutted against the circumferential wall of the manual shaft 2 under the action of the elastic member 5.

[0036] When the circumferential limiting block 6 is inserted into the circumferential limiting groove 8, the elastic element 5 acts on the locking element 4 to lock the locking element 4 into the first locking groove 9, thereby ensuring that the circumferential limiting block 6 and the circumferential limiting groove 8 remain in the inserted state; and when the circumferential limiting block 6 disengages from the circumferential limiting groove 8, the elastic element 5 drives the locking element 4 to lock into the second locking groove 10.

[0037] When the electric actuator loses power, the operator pushes the handwheel 3 inward towards the electric actuator, causing the circumferential limiting block 6 on the manual shaft 2 to insert into the circumferential limiting groove 8 of the electric actuator's drive shaft 7. At this time, the locking member 4 is locked into the first locking groove 9 under the action of the elastic member 5, keeping the circumferential limiting block 6 and the circumferential limiting groove 8 in an inserted state. The handwheel 3 can then be rotated, thereby driving the drive shaft 7 of the electric actuator to rotate and realizing the torque output of the electric actuator.

[0038] When manual operation is completed and it is necessary to switch to electric mode, the operator pulls the manual shaft 2 outward, causing the circumferential limit block 6 to disengage from the circumferential limit groove 8. The manual shaft 2 then disengages from the drive shaft 7 of the electric actuator. During the pulling of the manual shaft 2, the locking piece 4 gradually disengages from the first locking groove 9 and abuts against the outer wall of the manual shaft 2. The elastic element 5 is further compressed. When the circumferential limit block 6 completely disengages from the circumferential limit groove 8, the locking piece 4 is locked into the second locking groove 10 under the action of the elastic element 5. At this time, the manual mode is released, and the electric actuator switches to electric mode.

[0039] The first slot 9 and the second slot 10 are located at one end of the manual shaft 2 within the electric actuator. The distance between the first slot 9 and the second slot 10 is the same as the length of the circumferential limiting block 6. When the circumferential limiting block 6 is fully inserted into the circumferential limiting groove 8, the engaging member 4 is engaged in the first slot 9; when the circumferential limiting block 6 is fully disengaged from the circumferential limiting groove 8, the engaging member 4 is engaged in the second slot 10. Preferably, both the first slot 9 and the second slot 10 are symmetrical annular conical structures, allowing the engaging member 4 to engage and disengage more smoothly.

[0040] In other embodiments, the circumferential limiting block 6 may also be disposed on the end face of the drive shaft 7 of the electric actuator, and the circumferential limiting groove 8 is formed on the end face of the manual shaft 2. When the manual shaft 2 is pushed to move toward the electric actuator, the circumferential limiting groove 8 on the manual shaft 2 is fitted onto the circumferential limiting block 6 of the drive shaft 7 of the electric actuator.

[0041] In this embodiment, the circumferential limiting block 6 adopts a hexagonal prism structure, and the matching circumferential limiting groove 8 adopts a hexagonal slot structure. Of course, in other embodiments, the circumferential limiting block 6 can also adopt a polygonal or irregular circumferential structure such as a triangular prism or a quadrangular prism, as long as it can ensure that the manual shaft 2 and the transmission shaft 7 of the electric actuator can rotate synchronously after the circumferential limiting block 6 is inserted into the circumferential limiting groove 8.

[0042] To ensure the stability of the manual shaft 2's rotation, a support sleeve 12 is provided at the end of the manual shaft 2 furthest from the handwheel 3. This support sleeve 12 is fixedly installed inside the housing 13 of the electric actuator, and the manual shaft 2 is rotatably mounted on the inner ring of the support sleeve 12. Specifically, the support sleeve 12 is stepped, and its stepped surface tightly abuts against the housing 11 of the electric actuator, thereby ensuring the installation accuracy of the support sleeve 12.

[0043] A positioning sleeve 13 is fitted around the elastic element 5. The positioning sleeve 13 is installed on the housing 13 of the electric actuator. The positioning sleeve 13 is a cylindrical structure with one end open and the other end closed. The axis of the positioning sleeve 13 is perpendicular to the axis of the manual shaft 2. The elastic element 5 is installed inside the positioning sleeve 13. The locking member 4 is located at the open end of the positioning sleeve 13. One end of the elastic element 5 acts on the end face of the inner wall of the positioning sleeve 13, and the other end acts on the locking member 4, so that the locking member 4 is stably abutted against the outer wall of the manual shaft 2.

[0044] In this embodiment, the snap-fit ​​component 4 is a spherical ball bearing structure. When the snap-fit ​​component 4 abuts against the first slot 9 or the second slot 10 of the manual shaft 2, the portion of the snap-fit ​​component 4 located at the abutment section is outside the positioning sleeve 13, while the other portion is located inside the positioning sleeve 13, ensuring the stability of the snap-fit ​​component 4 in the abutment state. Preferably, the elastic element 5 is a spring.

[0045] In other embodiments, to further ensure the stability of manual state switching, the positioning sleeve 13, elastic element 5 and snap-fit ​​element 4 can be configured in multiple sets and evenly distributed around the manual axis 2 in the electric actuator housing 13 to ensure the stability of manual state switching.

[0046] In addition, the outer wall of the positioning sleeve 13 is formed with external threads, and the housing 13 of the electric actuator is formed with a corresponding threaded groove. The external threads of the positioning sleeve 13 are threadedly engaged with the threaded groove of the housing 13 of the electric actuator. By adjusting the installation depth of the positioning sleeve 13 in the threaded groove, the compression distance of the elastic element 5 can be adjusted, thereby changing the force exerted by the elastic element 5 on the snap-fit ​​element 4, ensuring the stability of the manual shaft 2 when it is pushed.

[0047] The handwheel operating mechanism in this embodiment also includes a power-off push rod 14 and a micro switch 15. The electric actuator housing 13 has a sliding groove 16. The power-off push rod 14 is slidably installed in the sliding groove 16. The axis of the power-off push rod 14 is perpendicular to the axis of the manual shaft 2. At the same time, a power-off limiting groove 17 is provided on the outer peripheral wall of the manual shaft 2. A power-off trigger spring 18 is sleeved on the outer peripheral wall of the power-off push rod 14. One end of the power-off trigger spring 18 acts on the power-off push rod 14, and the other end abuts against the bottom of the sliding groove 16.

[0048] A micro switch 15 is mounted on the housing 13 of the electric actuator and connected to the control circuit of the electric actuator. Specifically, the COM and N / O terminals of the micro switch 15 are connected to the control circuit of the electric actuator. When the micro switch 15 is closed, the COM and N / O terminals are connected, and the motor of the electric actuator is powered on and works normally. When the micro switch 15 is open, the COM and N / O terminals are disconnected, and the motor of the electric actuator cannot be powered.

[0049] When manual mode needs to be activated, the operator pushes the manual shaft 2 toward the electric actuator until the locking piece 4 engages with the first locking slot 9. At this time, the power-off push rod 14 slides into the power-off limit slot 17 under the action of the power-off trigger spring 18, and its end away from the manual shaft 2 disengages from the micro switch 15. The micro switch 15 is then disconnected, realizing emergency manual operation power-off protection. When manual mode is deactivated, the manual shaft 2 is pulled to disengage the circumferential limit block 6 from the circumferential limit slot 8. The power-off push rod 14 slides out of the power-off limit slot 17 and abuts against the micro switch 15. The micro switch 15 is then closed, and the electric actuator resumes electric operation.

[0050] To facilitate the sliding of the power-off push rod 14 into or out of the power-off limiting groove 17, the end of the power-off push rod 14 near the manual shaft 2 is set as a hemispherical shape, and the power-off push rod 14 as a whole has a stepped cylindrical structure. One end of the power-off trigger spring 18 abuts against the bottom of the sliding groove 16, and the other end abuts against the stepped surface of the power-off push rod 14.

[0051] The base 1 is mounted on the side wall of the electric actuator housing 13 and is tightened and fixed to the electric actuator housing 13 by screws. A spring mounting groove 19 is provided on the side of the base 1 near the electric actuator housing 13. A buffer spring 20 is installed in the spring mounting groove 19. A corresponding shoulder 21 is provided on the manual shaft 2. One end of the buffer spring 20 abuts against the bottom of the spring mounting groove 19, and the other end abuts against the shoulder 21 of the manual shaft 2.

[0052] When the operator pushes the manual shaft 2 toward the electric actuator, the buffer spring 20 is gradually released from the compressed state. The buffer spring 20 releases its elastic potential energy to assist the push, making it easy to switch to manual mode. When it is necessary to turn off the manual mode, the operator pulls the manual shaft 2 toward the electric actuator. During this process, the buffer spring 20 is compressed, which can play a buffering role in the process of pulling the manual shaft 2, making the movement of the manual shaft 2 more stable.

[0053] Specifically, a sealing ring 22 is fitted on the outer peripheral wall of the base 1 for the manual shaft 2. The sealing ring 22 is embedded in the annular groove of the manual shaft 2 and abuts against the inner wall of the base 1 to ensure the sealing performance of the manual shaft 2 during installation. At the same time, a sealing ring 26 is also provided between the base 1 and the housing 13 of the electric actuator. The double sealing ensures good sealing performance.

[0054] The working principle of a manual operating mechanism with power-off function disclosed in this application embodiment is as follows:

[0055] When the electric actuator is in electric mode, the circumferential limiting block 6 on the manual shaft 2 of the manual operating mechanism separates from the circumferential limiting groove 8 of the electric actuator drive shaft 7, and the locking member 4 is engaged into the second locking groove 10 of the manual shaft 2 under the action of the elastic member 5. At this time, the power-off push rod 14 abuts against the outer peripheral wall of the manual shaft 2, the micro switch 15 remains closed, and the electric actuator motor is powered on and works normally.

[0056] When the electric actuator is powered off or requires manual operation, pushing the handwheel 3 moves the manual shaft 2, causing the circumferential limit block 6 to insert into the circumferential limit groove 8 for synchronous rotation. During this process, the locking piece 4 disengages from the second locking groove 10. Once the circumferential limit block 6 is fully inserted, the locking piece 4, under the action of the elastic element 5, locks into the first locking groove 9, maintaining a stable insertion state. Simultaneously, the power-off push rod 14 slides into the power-off limit groove 17 under the action of the power-off trigger spring 18, and the micro switch 15 disconnects, cutting off the motor power supply and preventing the danger of accidental power-on. Rotating the handwheel 3 completes the manual adjustment of the valve.

[0057] After manual operation is completed, pull the manual shaft 2 to disengage the circumferential limit block 6 from the limit groove 8, and the snap-fit ​​4 disengages from the first snap-fit ​​groove 9 and snaps into the second snap-fit ​​groove 10, thus releasing the manual mode. The power-off push rod 14 slides out of the power-off limit groove 17 and re-abuts against the outer peripheral wall of the manual shaft 2, the micro switch 15 closes, and the electric actuator resumes electric mode.

[0058] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A manual operating mechanism with a power-off function, characterized in that, It includes a base (1), a manual shaft (2), a handwheel (3), a locking element (4), and an elastic element (5); the manual shaft (2) passes through the base (1) and is rotatably engaged with the base (1); one end of the manual shaft (2) extends into the electric actuator, and the other end is used to install the handwheel (3); one end of the manual shaft (2) extending into the electric actuator is provided with a circumferential limiting block (6), which is used to engage with a pre-opened circumferential limiting groove (8) on the transmission shaft (7) of the electric actuator; the outer wall of the manual shaft (2) is provided with a first locking groove (9) and a second locking groove (5) along the axial direction. 10); The snap-fit ​​member (4) and the elastic member (5) are installed on the electric actuator housing (11), and the snap-fit ​​member (4) abuts against the peripheral wall of the manual shaft (2) under the action of the elastic member (5); when the circumferential limiting block (6) is inserted into the circumferential limiting groove (8), the elastic member (5) acts on the snap-fit ​​member (4) to make the snap-fit ​​member (4) snap into the first slot (9); when the circumferential limiting block (6) is disengaged from the circumferential limiting groove (8), the elastic member (5) acts on the snap-fit ​​member (4) to make the snap-fit ​​member (4) snap into the second slot (10).

2. The manual operating mechanism with power-off function according to claim 1, characterized in that, The manual shaft (2) is provided with a support bushing (12) at one end away from the handwheel (3). The support bushing (12) is fixedly installed inside the housing (11) of the electric actuator. The manual shaft (2) is rotatably installed on the inner ring of the support bushing (12).

3. The manual operating mechanism with power-off function according to claim 1, characterized in that, The elastic element (5) is fitted with a positioning sleeve (13), which is installed in the housing (13) of the electric actuator. The elastic element (5) is installed inside the positioning sleeve (13). The snap-fit ​​element (4) is located at the open end of the positioning sleeve (13). One end of the elastic element (5) acts on the end face of the inner wall of the positioning sleeve (13), and the other end acts on the snap-fit ​​element (4).

4. A manual operating mechanism with power-off function according to claim 3, characterized in that, The snap-fit ​​component (4) has a spherical ball bearing structure.

5. A manual operating mechanism with power-off function according to claim 3, characterized in that, The positioning sleeve (13), the elastic element (5), and the snap-fit ​​element (4) are arranged in multiple sets and distributed circumferentially along the manual shaft (2) on the electric actuator housing (13).

6. A manual operating mechanism with power-off function according to claim 3, characterized in that, The outer wall of the positioning sleeve (13) is formed with an external thread, and the housing (13) of the electric actuator is formed with a threaded groove. The external thread of the positioning sleeve (13) is threadedly engaged with the threaded groove of the housing (13) of the electric actuator.

7. A manual operating mechanism with power-off function according to claim 1, characterized in that, It also includes a power-off push rod (14) and a micro switch (15); the electric actuator housing (13) has a sliding groove (16), the power-off push rod (14) is slidably installed in the sliding groove (16), the axis of the power-off push rod (14) is perpendicular to the axis of the manual shaft (2), the outer peripheral wall of the manual shaft (2) has a power-off limiting groove (17), the outer peripheral wall of the power-off push rod (14) is fitted with a power-off trigger spring (18), one end of the power-off trigger spring (18) acts on the power-off push rod (14), and the other end abuts against the bottom of the sliding groove (16); the micro switch (15) is installed in the electric actuator The control circuit of the electric actuator is connected to the outer casing (13); when the circumferential limiting block (6) is inserted into the circumferential limiting groove (8), the power-off push rod (14) slides into the power-off limiting groove (17) under the action of the power-off trigger spring (18), and the end of the power-off push rod (14) away from the manual shaft (2) disengages from the micro switch (15), and the micro switch (15) is disconnected; when the circumferential limiting block (6) disengages from the circumferential limiting groove (8), the end of the power-off push rod (14) slides out from the power-off limiting groove (17) and abuts against the micro switch (15), and the micro switch (15) is closed.

8. A manual operating mechanism with power-off function according to claim 1, characterized in that, The base (1) has a spring mounting groove (19) on the side near the electric actuator housing (13). A buffer spring (20) is installed in the spring mounting groove (19). A shoulder (21) is provided on the manual shaft (2). One end of the buffer spring (20) abuts against the bottom of the spring mounting groove (19), and the other end abuts against the shoulder (21) on the manual shaft (2).

9. A manual operating mechanism with power-off function according to claim 1, characterized in that, The manual shaft (2) is fitted with a sealing ring (22) on the outer peripheral wall of the base (1). The sealing ring (22) is embedded in the annular groove of the manual shaft (2) and abuts against the inner wall of the base (1). A sealing ring (26) is also provided between the base (1) and the housing (13) of the electric actuator.

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