A lock handle device

Abstract

The application provides a lock crank device, which comprises a handle shaft and a closed shell, the handle shaft is arranged on the closed shell, a second manual gear is fixedly installed on the outer surface of the handle shaft, the second manual gear is engaged with a first manual gear, a worm is fixedly installed on the end surface of the first manual gear, the worm is engaged with a worm gear, and a worm-shaped wheel connecting shaft is fixedly installed at the center of the worm gear, during application of the technical scheme, multiple groups of mechanisms are arranged to cooperate with each other, so that a complete operation time sequence closed loop can be formed during use, and the operation process is simplified, compared with the prior art, the technical scheme does not need an operator to assist in fixing the crank during operation, and does not need to separately perform a locking operation after the operation is completed, all actions are automatically completed along with the operation process, the operation steps are reduced, and the possibility of errors in the operation process is reduced.

Description

Technical Field

[0001] This invention relates to the field of medium-voltage electrical switch technology, and more particularly to a locking crank device. Background Technology

[0002] During operation and maintenance of medium-voltage electrical switch mechanisms, the opening and closing operations must be completed by manually cranking the handle. The transmission stroke of about two rotations of the handle is the key stage to ensure the reliability of the switch operation. The existing manual operation mechanism only locks after the opening and closing is in place, and there is no mid-term anti-pull-out structure designed to be synchronized with the internal transmission, nor are there any linkage components such as locking plates, connecting plates, and bending connecting plates.

[0003] The existing mechanism cannot automatically lock within the critical stroke of the crank handle rotation. The handle shaft and the locking component do not have matching slots. The locking action is not synchronized with the transmission of the gear, worm, worm wheel, and worm gear connecting shaft. Components such as tension springs, concave wheels, and guide plates cannot form coordinated actions and lack interlocking structures. This easily leads to problems such as accidental pullout of the crank handle, transmission interruption, improper operation, and jamming impact. Overall, the safety and stability are poor, making it difficult to meet the reliable operation requirements of medium-voltage switchgear. Summary of the Invention

[0004] To address the aforementioned problems, this invention proposes a locking crank device to more accurately resolve the problems described above.

[0005] This invention is achieved through the following technical solution: This invention proposes a locking crank device, comprising a handle shaft and a closed housing. The handle shaft is disposed on the closed housing. A second manual gear is fixedly mounted on the outer surface of the handle shaft, and the second manual gear meshes with a first manual gear. A worm gear is fixedly mounted on the end face of the first manual gear, and the worm gear meshes with a worm wheel. A worm-shaped wheel connecting shaft is fixedly mounted at the center of the worm wheel. A concave wheel, a positioning wheel, a third manual gear, and a locking disc are fixedly mounted on the outer surface of the worm-shaped wheel connecting shaft. The worm-shaped wheel connecting shaft meshes with a rack plate. A second locking plate is fixedly mounted on one end of the rack plate, and the second locking plate is correspondingly disposed with the handle shaft. A bent connecting plate is fitted with the concave wheel. A connecting plate is hinged to one end of the bent connecting plate. A first locking plate is fixedly mounted on one end of the connecting plate, and the first locking plate is correspondingly disposed with the handle shaft. A tension spring connects the bent connecting plate and the connecting plate. The connecting plate is slidably mounted on a guide plate. A pressure plate is fitted with the bent connecting plate. A positioning pin is fitted with the positioning wheel. A sliding plate is fixedly mounted on one end of the positioning pin, and a button is fixedly mounted on one end of the sliding plate.

[0006] Furthermore, the upper surface of the guide plate is provided with an elongated guide groove extending in the front-rear direction, the lower surface of the connecting plate is vertically fixed with a guide post, and the guide post is slidably embedded in the inside of the guide groove. The first locking plate is vertically fixed to the front end face of the connecting plate, and the locking end of the first locking plate is an arc-shaped structure adapted to the inner wall of the annular groove of the handle shaft. The radius of curvature of the arc-shaped structure is equal to the radius of curvature of the annular groove.

[0007] Furthermore, the outer contour surface of the concave wheel is smoothly composed of a continuous convex arc surface and a concave arc surface, and the central angle corresponding to the convex arc surface matches the angle of the worm gear connecting shaft rotating two revolutions. When the worm gear connecting shaft rotates to the point where the small bearing abuts against the convex arc surface, the bending connecting plate swings forward and pushes the connecting plate to slide forward along the guide plate, causing the first locking plate to engage in the annular groove of the handle shaft. When the worm gear connecting shaft rotates to the point where the small bearing abuts against the concave arc surface, the tension spring pulls the connecting plate to slide backward along the guide plate, causing the first locking plate to slide out of the annular groove of the handle shaft.

[0008] Furthermore, the axes of the second manual gear, the first manual gear, and the third manual gear are parallel to each other and located in the same vertical plane. The axis of the worm is perpendicular to the axis of the worm wheel connecting shaft and located in the same horizontal plane. The concave wheel and the positioning wheel are both fixedly sleeved on the outer circumferential surface of the worm wheel connecting shaft by a flat key. The end face of the concave wheel is provided with a transmission pinion, and it is in contact with the end face of the transmission pinion. A gap of 1-3mm is left between the right end face of the concave wheel and the left end face of the positioning wheel.

[0009] Furthermore, the closing and opening slots on the positioning wheel are arranged at 180-degree intervals along the circumferential direction. The width of the closing and opening slots is adapted to the diameter of the positioning pin. When the positioning pin is engaged in the closing or opening slot, the latch of the second locking plate is engaged in the spline groove of the handle shaft, restricting the circumferential rotation of the handle shaft.

[0010] Furthermore, one end of the tension spring is provided with a small bearing, and the tension spring is attached to the side wall of the bent connecting plate near the small bearing. The other end of the tension spring is attached to the left side wall of the connecting plate away from the first locking plate. The tension spring is in a pre-tensioned state when the device is in the initial state, and the pre-tension force is 5-15N, providing the connecting plate with a reset force in the direction away from the handle shaft.

[0011] Furthermore, the pressure plate is fixedly connected to the top inner wall of the closed housing by bolts. A gap of 0.5-2mm is left between the lower surface of the pressure plate and the upper surface of the bending connecting plate. The pressure plate covers the upper half of the swing trajectory of the bending connecting plate to restrict the upward movement of the bending connecting plate and ensure that the small bearing always remains in contact with the outer contour surface of the concave wheel.

[0012] The beneficial effects of this invention are: 1. During the application of this technical solution, by setting up a plug-in locking mechanism in cooperation with the main transmission mechanism, the axial movement of the handle shaft can be restricted within the critical stroke of the handle shaft rotation during use, thereby preventing the handle shaft from being accidentally pulled out during operation. The action of the plug-in locking mechanism is directly driven by the core shaft of the main transmission mechanism, so that the locking action is consistent with the transmission process and there will be no premature or delayed action. At the same time, by setting up a reset structure, the locking mechanism can automatically release the constraint after the operation is completed, without the need for the operator to perform additional unlocking operation, and without the need to manually keep the crank handle in the plugged state during operation.

[0013] 2. During the application of this technical solution, by setting up a state locking mechanism and a rotation locking mechanism in cooperation, the circumferential rotation of the handle shaft and the overall state of the mechanism can be restricted simultaneously when the operation is in place, thereby preventing excessive shaking and misoperation. The triggering of the state locking mechanism and the action of the rotation locking mechanism are synchronized, so that the state of the mechanism and the position of the handle shaft correspond. Subsequent operations can only be performed after the state lock is released. After the operation is completed, the mechanism automatically enters the locked state, without the need for additional manual fixing operations or separate checks on the locking state of the mechanism. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the internal front view structure of the present invention; Figure 2 This is a top view of the structure of the present invention; Figure 3 This is a schematic diagram of the internal rear view structure of the present invention; Figure 4 This is a schematic diagram of the internal side view structure of the present invention; Figure 5 This is a schematic diagram of the skateboard structure of the present invention; Figure 6 This is a side view of the structure of the present invention.

[0015] In the diagram: 1. Handle shaft; 2. Rack plate; 3. Tension spring; 4. First locking plate; 5. Connecting plate; 6. Positioning pin; 7. Guide plate; 8. Second locking plate; 9. Bending connecting plate; 10. Pressure plate; 11. Worm gear connecting shaft; 12. Positioning wheel; 13. Concave wheel; 14. Worm; 15. First manual gear; 16. Second manual gear; 17. Third manual gear; 18. Locking disc; 19. Button; 20. Slide plate; 21. Worm gear. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Example 1

[0017] Combination Figures 1-6As shown, a locking crank device includes a handle shaft 1 and a closed housing. The handle shaft 1 is mounted on the closed housing. A second manual gear 16 is fixedly installed on the outer surface of the handle shaft 1. The second manual gear 16 meshes with a first manual gear 15. A worm gear 14 is fixedly installed on the end face of the first manual gear 15. The worm gear 14 meshes with a worm wheel 21. A worm-shaped wheel connecting shaft 11 is fixedly installed at the center of the worm wheel 21. A concave wheel 13, a positioning wheel 12, a third manual gear 17, and a locking disc 18 are fixedly installed on the outer surface of the worm-shaped wheel connecting shaft 11. A rack plate 2 meshes with the worm-shaped wheel connecting shaft 11. A second locking plate 8 is fixedly installed at one end of the rack plate 2. The second locking plate 8 is correspondingly arranged with the handle shaft 1. Wheel 13 is fitted with a bending connecting plate 9. One end of the bending connecting plate 9 is hinged to a connecting plate 5. One end of the connecting plate 5 is fixedly installed with a first locking plate 4. The first locking plate 4 is correspondingly set with the handle shaft 1. A tension spring 3 connects the bending connecting plate 9 and the connecting plate 5. The connecting plate 5 is slidably installed on the guide plate 7. The bending connecting plate 9 is fitted with a pressure plate 10. The positioning wheel 12 is fitted with a positioning pin 6. One end of the positioning pin 6 is fixedly installed with a sliding plate 20. One end of the sliding plate 20 is fixedly installed with a button 19. During the application of this device, by setting the handle shaft 1, the second manual gear 16, the first manual gear 15, the worm 14, the worm wheel 21, the worm wheel connecting shaft 11, the concave wheel 13, the bending connecting plate 9, and the connecting plate 5, the device can be used to achieve the following: The components—first locking plate 4, tension spring 3, guide plate 7, pressure plate 10, rack plate 2, second locking plate 8, positioning wheel 12, positioning pin 6, sliding plate 20, button 19, third manual gear 17, and locking disc 18—ensure that during use, the handle shaft 1 can drive the second manual gear 16 to rotate. The second manual gear 16 drives the first manual gear 15 and worm gear 14 to rotate. The worm gear 14 drives the worm wheel 21 and the worm gear connecting shaft 11 to rotate synchronously. The worm gear connecting shaft 11 drives the concave wheel 13, positioning wheel 12, third manual gear 17, and locking disc 18 to move synchronously. The concave wheel 13 pushes the bending connecting plate 9 and connecting plate 5 to move. The connecting plate 5 drives the first locking plate 4 to move and cooperates with the tension spring 3 to complete the extension. The guide plate 7 provides a moving path for the connecting plate 5, the pressure plate 10 restricts the movement range of the bending connecting plate 9, the worm gear connecting shaft 11 drives the rack plate 2 and the second locking plate 8 to move, the positioning wheel 12 cooperates with the positioning pin 6, the slide plate 20 and the button 19 to complete the position limitation, so that the handle shaft 1 can be constrained by the first locking plate 4 to axial displacement during rotation, the second locking plate 8 can constrain the circumferential displacement of the handle shaft 1, the positioning wheel 12 and the positioning pin 6 can constrain the overall position of the mechanism, the tension spring 3 can drive the connecting plate 5 and the first locking plate 4 to return to the initial position, and the sequential linkage of each component can make the operation action complete synchronously with the transmission process, and the constraint and release of the handle shaft 1 can be realized without additional operation.

[0018] Combination Figures 1-5As shown, the upper surface of the guide plate 7 is provided with a long strip-shaped guide groove extending in the front-back direction. The lower surface of the connecting plate 5 is vertically fixed with a guide post, which is slidably embedded in the guide groove. The first locking plate 4 is vertically fixed to the front end face of the connecting plate 5. The locking end of the first locking plate 4 is an arc-shaped structure that matches the inner wall of the annular groove of the handle shaft 1. The radius of curvature of the arc-shaped structure is equal to the radius of curvature of the annular groove. The outer contour surface of the concave wheel 13 is smoothly connected by a continuous convex arc surface and a concave arc surface. The central angle corresponding to the convex arc surface matches the angle of the worm gear connecting shaft 11 rotating two revolutions.

[0019] In the above-described embodiments of this application, during the application of this device, by setting a guide plate 7, a connecting plate 5, a first locking plate 4, a concave wheel 13, and a worm gear connecting shaft 11, the guide post can slide along the elongated guide groove of the guide plate 7 during use, providing a stable moving path for the connecting plate 5. The connecting plate 5 drives the first locking plate 4 to move smoothly. The arc-shaped structure of the first locking plate 4 can fully fit with the annular groove of the handle shaft 1, improving the degree of constraint fit. The convex arc surface and concave arc surface of the concave wheel 13 can change the engagement state as the worm gear connecting shaft 11 rotates. The convex arc surface can continuously push the connecting plate 5 and the first locking plate 4 during the rotation of the worm gear connecting shaft 11 for two revolutions, keeping the first locking plate 4 in the constrained position. The concave arc surface can cooperate with the tension spring 3 to return the first locking plate 4 to the initial position, thereby keeping the handle shaft 1 in a constrained state within the specified rotation stroke, and automatically releasing the constraint after the rotation is completed. Example 2

[0020] Combination Figures 3-6 As shown, the axes of the second manual gear 16, the first manual gear 15, and the third manual gear 17 are parallel to each other and located in the same vertical plane. The axis of the worm 14 is perpendicular to the axis of the worm gear connecting shaft 11 and located in the same horizontal plane. The concave wheel 13 and the positioning wheel 12 are both fixedly sleeved on the outer circumference of the worm gear connecting shaft 11 by a flat key. The end face of the concave wheel 13 is provided with a transmission pinion, and it is in contact with the end face of the transmission pinion. A gap of 1-3mm is left between the right end face of the concave wheel 13 and the left end face of the positioning wheel 12. The brake on the positioning wheel 12 is closed. The slots and the opening slots are arranged at 180-degree intervals along the circumference. The width of the opening slots and the closing slots are matched with the diameter of the positioning pins 6. One end of the tension spring 3 is provided with a small bearing, and the tension spring 3 is hung on the side wall of the bending connecting plate 9 near the small bearing. The other end of the tension spring 3 is hung on the left side wall of the connecting plate 5 away from the first locking plate 4. The pressure plate 10 is fixedly connected to the top inner wall of the closed housing by bolts. There is a gap of 0.5-2mm between the lower surface of the pressure plate 10 and the upper surface of the bending connecting plate 9. The pressure plate 10 covers the upper half of the swing trajectory of the bending connecting plate 9.

[0021] In the above-described embodiments of this application, during the application of this device, by setting a second manual gear 16, a first manual gear 15, a third manual gear 17, a worm 14, a worm gear connecting shaft 11, a concave wheel 13, a positioning wheel 12, a positioning pin 6, a tension spring 3, a bent connecting plate 9, and a pressure plate 10, the three sets of manual gears are kept parallel and in the same vertical plane during use, and the worm 14 and the worm gear connecting shaft 11 are kept perpendicular and in the same horizontal plane, so that the power transmission path remains fixed. The concave wheel 13 and the positioning wheel 12 are fixed by a flat key. Fixed on the worm gear connecting shaft 11, rotating synchronously with the shaft, the concave wheel 13 and the positioning wheel 12 maintain a reasonable distance to avoid motion interference. The closing groove and opening groove on the positioning wheel 12 are arranged alternately, which can stably cooperate with the positioning pin 6. The two ends of the tension spring 3 are respectively connected to the bending connecting plate 9 and the connecting plate 5, providing continuous tension for component reset. The pressure plate 10 is fixed in the designated position and maintains a reasonable distance from the bending connecting plate 9, limiting the swing range of the bending connecting plate 9 and ensuring the stable cooperation state of the components. Each component is arranged and cooperated in a predetermined manner, so that the overall movement process is completed according to the preset trajectory.

[0022] The operating principle and advantages of this invention are as follows: During application, pressing button 19 causes the slide plate 20 to move vertically, which in turn causes the positioning pin 6 to move synchronously. The positioning pin 6 disengages from the closing or opening slot of the positioning wheel 12. The handle shaft 1 is then inserted into the operating hole of the isolating switch or the grounding switch. Rotating the handle shaft 1 causes the second manual gear 16 to rotate, which in turn causes the first manual gear 15 to rotate. The first manual gear 15 then causes the worm gear 14 to rotate, which in turn causes the worm wheel 21 to rotate. Wheel 21 drives the worm gear connecting shaft 11 to rotate, and the worm gear connecting shaft 11 drives the concave wheel 13 to rotate synchronously. The convex arc surface of the concave wheel 13 contacts the small bearing on the bending connecting plate 9, pushing the bending connecting plate 9 to swing. The bending connecting plate 9 pushes the connecting plate 5 to slide along the guide plate 7. The connecting plate 5 drives the first locking plate 4 to move towards the handle shaft 1. The first locking plate 4 is locked into the annular groove of the handle shaft 1. The tension spring 3 is stretched as the connecting plate 5 moves. The pressure plate 10 restricts the axial movement of the bending connecting plate 9, ensuring that the small bearing always keeps in contact with the outer contour surface of the concave wheel 13.

[0023] Continue rotating the handle shaft 1. The worm gear connecting shaft 11 continues to rotate, driving the transmission pinion to rotate synchronously. The transmission pinion drives the rack plate 2 to move. The rack plate 2 drives the second locking plate 8 to move towards the handle shaft 1. At the same time, the worm gear connecting shaft 11 drives the positioning wheel 12 to rotate synchronously. When the handle shaft 1 rotates to the closed position, the second locking plate 8 is engaged in the spline groove of the handle shaft 1. At the same time, the closing groove of the positioning wheel 12 rotates to the position directly below the positioning pin 6. The positioning pin 6 is engaged in the closing groove under the action of the return spring. At this time, the concave arc surface of the concave wheel 13 rotates to the position directly below the small bearing. The tension spring 3 contracts, pulling the connecting plate 5 to slide in the opposite direction along the guide plate 7. The connecting plate 5 drives the first locking plate 4 to disengage from the annular groove of the handle shaft 1. The handle shaft 1 can be pulled out from the operating hole. The locking disc 18 restricts the axial movement of the worm gear connecting shaft 11. The third manual gear 17 rotates with the worm gear connecting shaft 11, transmitting power to the output end of the switch mechanism to complete the closing action of the switch.

[0024] Pressing button 19 causes the slide plate 20 and positioning pin 6 to move. Positioning pin 6 disengages from the closing groove of positioning wheel 12, allowing the handle shaft 1 to be inserted into the operating hole. Rotating handle shaft 1 in the reverse direction causes it to drive the worm gear connecting shaft 11 to rotate in the reverse direction via the second manual gear 16, the first manual gear 15, the worm 14, and the worm wheel 21. The worm gear connecting shaft 11 then drives the concave wheel 13 to rotate in the reverse direction, causing the convex arc surface of the concave wheel 13 to contact the small bearing again, pushing the bending connecting plate 9 to swing. The bending connecting plate 9 pushes the connecting plate 5, causing the first locking plate 4 to engage in the annular groove of handle shaft 1. Continuing to rotate handle shaft 1 in the reverse direction causes the worm gear connecting shaft 11 to drive the transmission pinion to rotate in the reverse direction, which in turn drives the gear... When the rack plate 2 moves in the reverse direction, the rack plate 2 drives the second locking plate 8 to disengage from the spline groove of the handle shaft 1. At the same time, the worm gear connecting shaft 11 drives the positioning wheel 12 to rotate in the reverse direction. When the handle shaft 1 rotates to the open position, the second locking plate 8 is locked into the spline groove of the handle shaft 1 again. At the same time, the open groove of the positioning wheel 12 rotates to the position directly below the positioning pin 6, and the positioning pin 6 is locked into the open groove. At this time, the concave arc surface of the concave wheel 13 rotates again to the position directly below the small bearing. The tension spring 3 pulls the connecting plate 5 to reset, the first locking plate 4 disengages from the annular groove of the handle shaft 1, and the handle shaft 1 can be pulled out. The third manual gear 17 rotates in the reverse direction with the worm gear connecting shaft 11, transmitting power to the output end of the switch mechanism to complete the open action of the switch.

[0025] This device, by setting the concave wheel 13 to cooperate with the bending connecting plate 9, ensures that the first locking plate 4 remains engaged in the annular groove of the handle shaft 1 within the stroke of the worm gear connecting shaft 11 rotating two revolutions, thereby preventing the handle shaft 1 from being accidentally pulled out during operation. By setting the worm gear connecting shaft 11 to synchronously drive the concave wheel 13, the transmission pinion, and the positioning wheel 12, the timing of the insertion and removal locking action, the rotation locking action, and the status locking action is kept consistent with the rotation angle of the transmission chain. Through the structure composed of the positioning wheel 12, the positioning pin 6, the sliding plate 20, and the button 19, the handle shaft 1 can only be rotated after the status lock is released by pressing the button 19. After the operation is completed, the positioning pin 6 automatically engages in the corresponding groove of the positioning wheel 12, and at the same time, the first locking plate 4 automatically releases the axial lock. The guide plate 7 provides sliding guidance for the connecting plate 5, so that the movement trajectory of the first locking plate 4 remains fixed. The pressure plate 10 restricts the movement of the bending connecting plate 9, so that the contact state between the small bearing and the concave wheel 13 remains stable. The locking disc 18 restricts the axial movement of the worm gear connecting shaft 11, so that the meshing state of each transmission component remains stable. The tension spring 3 provides reset power for the connecting plate 5, so that the first locking plate 4 can automatically disengage from the annular groove of the handle shaft 1 after the operation is completed. The scope of protection of this application does not involve improvements to the electronic components of the device or equipment. Therefore, the working principles of each electronic component are not described in detail here. The electronic components in this application are all conventional electronic components used in the prior art. They are all conventional technical means in the prior art, and the application of the prior art is very mature. Therefore, they will not be elaborated here.

[0026] Of course, the present invention may have many other embodiments. Based on this embodiment, other embodiments obtained by those skilled in the art without any creative effort are all within the scope of protection of the present invention.

Claims

1. A locking crank device, characterized in that, Includes a handle shaft (1) and a closed housing. The handle shaft (1) is mounted on the closed housing. A second manual gear (16) is fixedly mounted on the outer surface of the handle shaft (1). The second manual gear (16) meshes with a first manual gear (15). A worm gear (14) is fixedly mounted on the end face of the first manual gear (15). The worm gear (14) meshes with a worm wheel (21). A worm wheel connecting shaft (11) is fixedly mounted at the center of the worm wheel (21). A concave wheel (13), a positioning wheel (12), a third manual gear (17), and a locking disc (18) are fixedly mounted on the outer surface of the worm wheel connecting shaft (11). A rack plate (2) meshes with the worm wheel connecting shaft (11). One end of the rack plate (2) is fixedly mounted with... There is a second locking plate (8), which is correspondingly set with the handle shaft (1). The concave wheel (13) is fitted with a bending connecting plate (9). One end of the bending connecting plate (9) is hinged to a connecting plate (5). One end of the connecting plate (5) is fixedly installed with a first locking plate (4). The first locking plate (4) is correspondingly set with the handle shaft (1). A tension spring (3) is connected between the bending connecting plate (9) and the connecting plate (5). The connecting plate (5) is slidably installed on the guide plate (7). The bending connecting plate (9) is fitted with a pressure plate (10). The positioning wheel (12) is fitted with a positioning pin (6). One end of the positioning pin (6) is fixedly installed with a sliding plate (20). One end of the sliding plate (20) is fixedly installed with a button (19).

2. The locking crank device according to claim 1, characterized in that, The upper surface of the guide plate (7) is provided with a long strip-shaped guide groove extending in the front-back direction. The lower surface of the connecting plate (5) is vertically fixed with a guide post, and the guide post is slidably embedded in the inside of the guide groove. The first locking plate (4) is vertically fixed to the front end face of the connecting plate (5). The locking end of the first locking plate (4) is an arc-shaped structure that is adapted to the inner wall of the annular groove of the handle shaft (1). The radius of curvature of the arc-shaped structure is equal to the radius of curvature of the annular groove.

3. A locking crank device according to claim 2, characterized in that, The outer contour surface of the concave wheel (13) is composed of a continuous convex arc surface and a concave arc surface smoothly connected, and the central angle corresponding to the convex arc surface matches the angle of the worm wheel connecting shaft (11) rotating two revolutions.

4. A locking crank device according to claim 3, characterized in that, The axes of the second manual gear (16), the first manual gear (15), and the third manual gear (17) are parallel to each other and located in the same vertical plane. The axis of the worm (14) is perpendicular to the axis of the worm wheel connecting shaft (11) and located in the same horizontal plane. The concave wheel (13) and the positioning wheel (12) are both fixedly sleeved on the outer circumference of the worm wheel connecting shaft (11) by a flat key. The left end face of the concave wheel (13) is in contact with the right end face of the transmission pinion. A gap of 1-3mm is left between the right end face of the concave wheel (13) and the left end face of the positioning wheel (12).

5. A locking crank device according to claim 4, characterized in that, The closing slot and opening slot on the positioning wheel (12) are arranged at 180-degree intervals along the circumferential direction, and the width of the closing slot and opening slot is adapted to the diameter of the positioning pin (6).

6. A locking crank device according to claim 5, characterized in that, One end of the tension spring (3) is provided with a small bearing, and the tension spring (3) is attached to the side wall of the bent connecting plate (9) near the small bearing. The other end of the tension spring (3) is attached to the left side wall of the connecting plate (5) away from the first locking plate (4).

7. A locking crank device according to claim 6, characterized in that, The pressure plate (10) is fixedly connected to the top inner wall of the closed housing by bolts. A gap of 0.5-2mm is left between the lower surface of the pressure plate (10) and the upper surface of the bending connecting plate (9). The pressure plate (10) covers the upper half of the swing trajectory of the bending connecting plate (9).

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