Hand-cranking mechanism for hand-cranking speed reducer

Abstract

The utility model relates to the technical field of speed reducers, in particular to a hand-cranking mechanism for a hand-cranking speed reducer. The hand-cranking mechanism for the hand-cranking speed reducer comprises a rotating shaft, a fixing cover, a screwing-out piece, a driving bevel gear and a driven bevel gear, the fixing cover is fixedly installed on the speed reducer, and the axis of the fixing cover is perpendicular to the axis of a worm in the speed reducer. The side face of the fixing cover is provided with a round hole for the screwing-out piece to penetrate through, and the round hole and the fixing cover are coaxial. The screw-out piece is in threaded connection with the inner wall of the fixing cover, one end of the rotating shaft is rotationally connected with the screw-out piece, a driving bevel gear is installed at the other end of the rotating shaft, and the driven bevel gear is installed at the end, close to the fixing cover, of the worm. Even if a power failure or a fault occurs, a worker can drive the speed reducer through manual operation, so that the adaptability of the worm gear speed reducer and the flexibility in use are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of reducers, in particular to a hand-cranked reducer with a hand-cranked mechanism. Background Art

[0002] Currently, reducers are mainly divided into worm gear reducers and planetary reducers. Among them, the worm gear reducer mainly consists of a housing, an input motor, a worm wheel and a worm. The output end of the input motor is connected to one end of the worm, and the deceleration effect is achieved by utilizing the meshing between the worm wheel and the worm.

[0003] However, in actual use of the existing worm gear reducer, once a power outage occurs, the input motor will be unable to drive the worm to rotate, causing the reducer to be in a paused state. Utility Model Content

[0004] (I) The problem to be solved by the present utility model is that in the actual use of the existing worm gear reducer, once a power failure occurs, the input motor will not be able to drive the worm to rotate, causing the reducer to be in a paused state.

[0005] (II) Technical solution

[0006] A hand-cranked reducer with a hand-cranked mechanism comprises a rotating shaft, a fixed cover, a screw-out piece, a driving bevel gear and a driven bevel gear, wherein the fixed cover is fixedly mounted on the reducer, and the axis of the fixed cover is perpendicular to the axis of the worm in the reducer, and a circular hole for the screw-out piece to pass through is provided on the side of the fixed cover, and the circular hole is coaxial with the fixed cover;

[0007] The screw-out member is screwed to the inner wall of the fixed cover, one end of the rotating shaft is rotatably connected to the screw-out member, and the other end of the rotating shaft is provided with a driving bevel gear, and the driven bevel gear is provided at one end of the worm gear close to the fixed cover;

[0008] The screw-out member is used to drive the rotating shaft to move along the axial direction of the fixed cover, so that the active bevel gear is meshed with the driven bevel gear, or the active bevel gear is disengaged from the driven bevel gear.

[0009] According to one embodiment of the utility model, the screw-out member includes a screw-out sleeve and a screw-out seat, the screw-out seat is arranged inside the fixed cover and is threadedly connected to the inner wall of the fixed cover, one end of the screw-out sleeve extends into the interior of the fixed cover and is fixed to the side surface of the screw-out seat, and one end of the rotating shaft extends into the interior of the screw-out sleeve and is rotatably connected to the screw-out sleeve.

[0010] According to an embodiment of the utility model, a flange is provided on the end surface of the screw-out sleeve close to the screw-out seat, and the flange is connected to the side surface of the screw-out seat by fixing bolts.

[0011] According to an embodiment of the utility model, a connecting bearing is provided on the inner wall of the screw-out seat, and the connecting bearing is cooperatively connected with the rotating shaft.

[0012] According to an embodiment of the utility model, a plurality of threaded holes are evenly opened on the end surface of the fixing cover around its axis, and a locking bolt is screwed into each of the threaded holes, and the fixing cover is connected to the reducer through the locking bolt.

[0013] According to an embodiment of the utility model, an annular gap is formed between the outer wall of the unscrewing sleeve and the inner wall of the circular hole of the fixing cover, and an oil seal 1 is installed in the annular gap.

[0014] According to an embodiment of the utility model, a second oil seal is installed on the inner wall of the screw-out sleeve, and the rotating shaft extends into one end of the screw-out sleeve and passes through the second oil seal.

[0015] According to an embodiment of the utility model, the hand-cranked reducer further comprises a crank handle used in conjunction with the rotating shaft using the hand-cranked mechanism.

[0016] Beneficial effects of the utility model:

[0017] The utility model provides a hand-cranked reducer with a hand-cranked mechanism, comprising a rotating shaft, a fixed cover, a screw-out piece, a driving bevel gear and a driven bevel gear, wherein the fixed cover is fixedly mounted on the reducer, and the axis of the fixed cover is perpendicular to the axis of the worm in the reducer, and a circular hole for the screw-out piece to pass through is provided on the side of the fixed cover, and the circular hole is coaxial with the fixed cover;

[0018] The screw-out piece is screwed to the inner wall of the fixed cover, one end of the rotating shaft is rotatably connected to the screw-out piece, and the other end is equipped with a driving bevel gear, and the driven bevel gear is installed at one end of the worm gear close to the fixed cover;

[0019] The screw-out member is used to drive the rotating shaft to move along the axial direction of the fixed cover so that the active bevel gear is meshed with the driven bevel gear, or the active bevel gear is disengaged from the driven bevel gear.

[0020] When a power outage occurs, the input motor is first removed, and then the worker rotates the unscrewing piece, which drives the rotating shaft and the active bevel gear to move toward the driven bevel gear until the active bevel gear on the rotating shaft meshes with the driven bevel gear on the worm. Then the rotating shaft is rotated with a tool, and the rotating shaft drives the active bevel gear to rotate, thereby driving the driven bevel gear and the worm to rotate. The worm rotates to drive the worm wheel and the output shaft to rotate, so that the reducer is in working condition. When a call comes back, no manual drive is required. At this time, the unscrewing piece can be rotated in the opposite direction, and the unscrewing piece drives the rotating shaft and the active bevel gear to move away from the driven bevel gear until the active bevel gear on the rotating shaft is disengaged from the driven bevel gear on the worm, and then the input motor can be reconnected to the worm.

[0021] It can be seen that in the present application, the worm gear reducer can be manually driven to work, and even if a power outage or failure occurs, workers can use manual operation to drive the reducer, which improves the adaptability of the worm gear reducer and its flexibility in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 A top view provided for the second embodiment of the utility model;

[0024] Figure 2 A cross-sectional view taken along line AA provided in Embodiment 2 of the present utility model;

[0025] Figure 3 A cross-sectional view of BB provided in Embodiment 2 of the present utility model;

[0026] Figure 4 The second embodiment of the present invention provides Figure 3 Magnified view of part C.

[0027] Icons: 1. Machine body; 2. Motor flange; 3. Worm; 301. Driven bevel gear; 302. Worm tooth surface; 4. Output shaft; 401. Worm wheel; 5. Hand-crank mechanism; 501. Fixed cover; 502. Locking bolt; 503. Unscrew sleeve; 504. Unscrew seat; 505. Fixing bolt; 506. Connecting bearing; 507. Rotating shaft; 508. Driving bevel gear; 509. Oil seal one; 510. Oil seal two; 6. Adapter sleeve; 7. First bearing; 8. Retaining ring; 9. Bearing seat; 10. First oil seal; 11. Locking nut; 12. Second bearing; 13. Third bearing; 14. Second oil seal. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] Embodiment 1:

[0030] like Figure 2 and Figure 3 As shown, an embodiment of the utility model provides a hand-cranked reducer with a hand-cranked mechanism, comprising a rotating shaft 507, a fixed cover 501, a screw-out piece, a driving bevel gear 508 and a driven bevel gear 301, wherein the fixed cover 501 is fixedly mounted on the reducer, and the axis of the fixed cover 501 is perpendicular to the axis of the worm 3 in the reducer, and a circular hole for the screw-out piece to pass through is provided on the side of the fixed cover 501, and the circular hole is coaxial with the fixed cover 501;

[0031] The screw-out member is screwed to the inner wall of the fixed cover 501, one end of the rotating shaft 507 is rotatably connected to the screw-out member, and the other end thereof is provided with a driving bevel gear 508, and the driven bevel gear 301 is provided at one end of the worm 3 close to the fixed cover 501;

[0032] The screw-out member is used to drive the rotating shaft 507 to move along the axial direction of the fixed cover 501 , so that the driving bevel gear 508 is meshed with the driven bevel gear 301 , or the driving bevel gear 508 is disengaged from the driven bevel gear 301 .

[0033] In this embodiment, when power failure occurs, the input motor is first removed, and then the worker rotates the unscrewing piece, which drives the rotating shaft 507 and the driving bevel gear 508 to move in the direction close to the driven bevel gear 301, until the driving bevel gear 508 on the rotating shaft 507 is meshed with the driven bevel gear 301 on the worm 3, and then the rotating shaft 507 is rotated by a tool, and the rotating shaft 507 drives the driving bevel gear 508 to rotate, thereby driving the driven bevel gear 301 and the worm 3 to rotate, and the worm 3 rotates to drive the worm wheel 401 and the output shaft 4 to rotate, so that the reducer can be in a working state. When a call comes, no manual drive is required, and the unscrewing piece can be rotated in the opposite direction at this time, and the unscrewing piece drives the rotating shaft 507 and the driving bevel gear 508 to move in the direction away from the driven bevel gear 301, until the driving bevel gear 508 on the rotating shaft 507 is disengaged from the driven bevel gear 301 on the worm 3, and then the input motor is reconnected to the worm 3.

[0034] It can be seen that in the present application, the worm gear reducer can be driven to work by manually driving the hand-crank mechanism 5. Even if a power outage or failure occurs, workers can use manual operation to drive the reducer, which improves the adaptability of the worm gear reducer and its flexibility in use.

[0035] Preferably, Figure 3 and Figure 4 As shown, the screw-out member includes a screw-out sleeve 503 and a screw-out seat 504, the fixed cover 501 is in the shape of a round cover, the screw-out seat 504 is in the shape of a circular ring, the screw-out sleeve 503 is in the shape of a circular tube, and the fixed cover 501 is installed on the front of the reducer housing. A circular hole is opened at the center of the fixed cover 501, the screw-out seat 504 is arranged inside the fixed cover 501 and is screwed with the inner wall of the fixed cover 501, one end of the screw-out sleeve 503 passes through the circular hole on the end face of the fixed cover 501 and extends into the inner wall of the fixed cover 501, and the end face of the screw-out sleeve 503 is fixedly connected to the side of the screw-out seat 504. Further, the rotating shaft 507 extends into the interior of the screw-out sleeve 503 and is rotatably connected with the screw-out sleeve 503.

[0036] It should be noted that if Figure 4 As shown, a crank connecting hole for use with a crank is provided on the end surface of the rotating shaft 507 away from the active bevel gear 508.

[0037] It should be noted that the rotating shaft 507 is perpendicular to the worm 3 , and the axis of the rotating shaft 507 and the axis of the worm 3 are coplanar.

[0038] In this way, when the power is off, the worker first removes the input motor, and then the worker rotates and unscrews the sleeve 503. Because the unscrew sleeve 503 and the unscrew seat 504 are fixed, and the unscrew seat 504 is screwed to the inner wall of the fixed cover 501, when the unscrew sleeve 503 is rotated, the unscrew sleeve 503 will move along the axial direction of the rotating shaft 507 together with the unscrew seat 504 and the rotating shaft 507, so that the active bevel gear 508 at the end of the rotating shaft 507 is close to the driven bevel gear 301, until the active bevel gear 508 is meshed with the driven bevel gear 301, and then the rotation of the unscrew sleeve 503 is stopped. Then the worker inserts one end of the crank into the crank connecting hole on the end face of the rotating shaft 507, and shakes the crank to drive the rotating shaft 507 to rotate. The active bevel gear 508 rotates with the rotation of the rotating shaft 507, thereby driving the driven bevel gear 301 and the worm 3 to rotate. The worm 3 rotates to drive the worm wheel 401 and the output shaft 4 to rotate, so that the reducer can be in working state.

[0039] When a call comes in, no manual drive is required. At this time, the sleeve 503 can be rotated in the reverse direction, and the sleeve 503 drives the screw-out seat 504 and the rotating shaft 507 to move away from the driven bevel gear 301, so that the driving bevel gear 508 on the rotating shaft 507 is separated from the driven bevel gear 301 on the worm 3, and finally the input motor is reconnected with the worm 3. It should be noted that the crank can be a Z-shaped crank commonly used on the market.

[0040] It can be seen that in this embodiment, the reducer can be driven to work by manual operation, and the reducer can be in working state even when the power is off, thereby improving the adaptability and flexibility of the reducer.

[0041] As an alternative embodiment, in order to facilitate the rotation and unscrewing of the sleeve 503, a rotating cover is screwed on the end of the unscrewing sleeve 503, and the rotating cover is in the shape of a round cover, and anti-slip protrusions are evenly arranged on the outer side of the rotating cover. In this way, the unscrewing sleeve 503 can be easily rotated and unscrewed.

[0042] Optionally, a plurality of fixing rods are provided on the side of the end of the unscrewing sleeve 503 exposed to the outside, and the plurality of fixing rods are evenly distributed around the axis of the unscrewing sleeve 503. In this way, the worker can hold the fixing rod to rotate the unscrewing sleeve 503, and the unscrewing sleeve 503 is more labor-saving.

[0043] It should be noted that the reducer includes a body 1, which includes a base and an arc-shaped surrounding shell on the top of the base. The reducer includes an input cavity and an output cavity. The input cavity is formed in the base, and the left end of the input cavity has an opening. The output cavity is formed in the arc-shaped surrounding shell, and the axis of the output cavity is perpendicular to the axis of the input cavity. The output shaft 4 is rotatably installed in the output cavity, and the front end of the output shaft 4 extends into the output cavity to form an input end. The worm gear 401 is coaxially arranged on the output shaft 4, and the lower half of the worm gear 401 extends into the input cavity of the base. Further, as Figure 1 As shown, a mounting hole is opened on the front side of the base, the mounting hole is perpendicular to the input cavity, and the mounting hole is connected to the input cavity, and the rotating shaft 507 is rotatably installed in the input cavity.

[0044] Preferably, a plurality of bolt holes are evenly provided around the mounting hole on the front side of the base of the machine body 1, and a plurality of countersunk holes corresponding to the bolt holes are evenly provided around the axis of the fixing cover 501. When installing the fixing cover 501, align the fixing cover 501 with the mounting hole on the base and fit the fixing cover 501 to the front side of the base, then rotate the fixing cover 501 so that the countersunk holes on the fixing cover 501 are aligned with the bolt holes on the front side of the base, and finally fix the fixing cover 501 with the locking bolts 502. This facilitates the subsequent disassembly work and also facilitates the maintenance work.

[0045] Preferably, Figure 4 The screw-out seat 504 is in a circular ring shape, and an external thread is provided on the outer surface of the screw-out seat 504 . An internal thread groove is provided on the inner wall of one end of the fixed cover 501 close to the driven bevel gear 301 , so that the screw-out seat 504 can be screwed with the fixed cover 501 .

[0046] In addition, considering that the service life of the external thread of the screw-out seat 504 will be reduced after long-term wear, it needs to be replaced. In order to facilitate the disassembly of the screw-out sleeve 503 and the screw-out seat 504, the screw-out sleeve 503 and the screw-out seat 504 are designed to be detachable.

[0047] Specifically, a flange is provided on the outer side of the end of the screw-out sleeve 503 close to the screw-out seat 504, and a plurality of bolt holes are evenly provided on the end face of the screw-out seat 504 facing the screw-out sleeve 503, and the bolt holes correspond to the flange holes on the flange. In this way, when connecting the screw-out sleeve 503 and the screw-out seat 504, it is only necessary to make the flange of the screw-out sleeve 503 fit with the end face of the screw-out seat 504 and make the flange holes on the flange align with the bolt holes on the screw-out seat 504, and finally use the fixing bolts 505 to fix the flange to the screw-out seat 504.

[0048] As a preferred embodiment, Figure 4As shown, a connecting bearing 506 is provided on the inner wall of the screw-out seat 504, and an oil seal 2 510 is provided on the inner wall of the screw-out sleeve 503. The axes of the oil seal 2 510 and the connecting bearing 506 are collinear. The connecting bearing 506 plays a role in supporting the rotating shaft 507. The end of the rotating shaft 507 away from the active bevel gear 508 passes through the oil seal 2 510.

[0049] Furthermore, an oil seal 509 is coaxially mounted on the inner wall of the circular hole at the center of the fixed cover 501 , and the oil seal 509 cooperates with the unscrewing sleeve 503 .

[0050] Embodiment 2:

[0051] The second embodiment of the present invention provides a hand-cranked reducer, which includes the hand-cranked mechanism 5, the body 1, the output shaft 4, the worm wheel 401, the worm 3, the motor flange 2 and other components in the first embodiment.

[0052] Specifically, Figure 1 and Figure 2 As shown, the hand-cranked reducer includes a body 1, which includes a base and an arc-shaped surrounding shell on the top of the base. The reducer includes an input cavity and an output cavity. The input cavity is formed in the base, and the left end of the input cavity has an opening. The output cavity is formed in the arc-shaped surrounding shell, and the axis of the output cavity is perpendicular to the axis of the input cavity. The output shaft 4 is rotatably mounted in the output cavity, and the front end of the output shaft 4 extends out of the arc-shaped surrounding shell to form an input end. The worm gear 401 is coaxially arranged on the output shaft 4, and the lower half of the worm gear 401 extends into the input cavity of the base. Further, a mounting hole is opened on the front of the base, the mounting hole is perpendicular to the input cavity, and the mounting hole is connected to the input cavity. The rotating shaft 507 is rotatably mounted in the input cavity, and the fixed cover 501 of the hand-cranked mechanism in the first embodiment is mounted at the mounting hole.

[0053] Preferably, Figure 1 and Figure 2 As shown, there is an input port on the left side of the machine body 1, which is connected to the input cavity, and the motor flange 2 is fixedly installed at the input port and is coaxially arranged with the input port. The second bearing 12 and the third bearing 13 are installed in sequence in the input cavity, and the second bearing 12 and the third bearing 13 are symmetrically arranged about the input cavity. The two ends of the worm 3 pass through the second bearing 12 and the third bearing 13 respectively, the second bearing 12 is close to the input port, and the third bearing 13 is far away from the input port. The worm 3 has a worm tooth surface 302 meshing with the worm wheel 401, and the worm tooth surface 302 is located between the second bearing 12 and the third bearing 13, and the worm tooth surface 302 is meshing with the worm wheel 401.

[0054] Furthermore, a first bearing 7 is installed on the inner wall of the motor flange 2, and an adapter sleeve 6 is connected in the first bearing 7. One end of the adapter sleeve 6 is connected to one end of the worm 3, and the adapter sleeve 6 is used to connect to the input motor.

[0055] In this way, the input motor drives the adapter sleeve 6 to drive the worm 3 to rotate, and the rotation of the worm 3 drives the worm wheel 401 to rotate, and finally drives the output shaft 4 to rotate.

[0056] As a preferred embodiment, a first oil seal 10 and a second oil seal 14 are respectively sleeved on both ends of the worm 3, wherein the first oil seal 10 is located on the left side of the second bearing 12, and the second oil seal 14 is located on the right side of the third bearing 13, so that the part of the input cavity located between the first oil seal 10 and the second oil seal 14 is in a sealed environment. It should be noted that the main function of the oil seal is to seal the oil, that is, to isolate the parts of the transmission parts that need to be lubricated from the external environment to prevent the leakage of lubricating oil, and at the same time prevent external dust, impurities, etc. from entering the machine, thereby ensuring the normal operation of the equipment and extending the service life of the equipment.

[0057] It should be noted that the motor flange 2 and the body 1 are connected through the bearing seat 9. Specifically, the bearing seat 9 includes a rectangular plate and a bearing sleeve. A circular hole is opened on the rectangular plate. One end of the bearing sleeve is fixed to the rectangular plate, and the bearing sleeve is coaxially arranged with the circular hole on the rectangular plate. A first circular hole is opened at the four corners of the rectangular plate. Four bolt holes are evenly arranged around the input port on the left side of the base. Further, four second circular holes are arranged on the end face of the motor flange 2 close to the bearing seat 9, and the first circular holes and the second circular holes correspond to each other one by one. When installing the motor flange 2, it is only necessary to insert the bearing sleeve of the bearing seat 9 into the input cavity. At this time, the four first circular holes on the bearing seat 9 are aligned with the four bolt holes on the left side of the base. Then, the motor flange 2 is attached to the rectangular plate of the bearing seat 9, and the four second circular holes on the motor flange 2 are aligned with the four first circular holes on the rectangular plate. Finally, the bolts are inserted into the second circular holes and tightened to fix the motor flange 2 and the bearing seat 9 to the body 1 together. This makes subsequent disassembly and maintenance work easier.

[0058] Optional, such as Figure 3 As shown, in order to prevent the second bearing 12 from deflecting, a protrusion is provided on the outer peripheral surface of the worm 3, and the right side of the second bearing 12 contacts the protrusion, and a locking nut 11 is also screwed on the worm 3, and the locking nut 11 is located on the left side of the second bearing 12. In this way, by tightening the locking nut 11, the locking nut 11 tightly presses against the second bearing 12, so that the second bearing 12 is limited between the protrusion and the locking nut 11.

[0059] Optionally, a retaining spring 8 is provided on the inner wall of the motor flange 2, the adapter sleeve 6 passes through the retaining spring 8, and the retaining spring 8 is attached to the left side surface of the first bearing 7. The retaining spring 8 serves to limit the adapter sleeve 6.

[0060] In the description of the present invention, it should be noted that the terms "upper" and "lower" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0061] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the insides of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A hand-cranked reducer with a hand-cranked mechanism, characterized in that: The invention comprises a rotating shaft (507), a fixed cover (501), a screw-out piece, a driving bevel gear (508) and a driven bevel gear (301), wherein the fixed cover (501) is fixedly mounted on the reducer, and the axis of the fixed cover (501) is perpendicular to the axis of the worm (3) in the reducer, and a circular hole for the screw-out piece to pass through is formed on the side surface of the fixed cover (501), and the circular hole is coaxial with the fixed cover (501); The screw-out member is threadedly connected to the inner wall of the fixed cover (501); one end of the rotating shaft (507) is rotatably connected to the screw-out member, and the other end of the rotating shaft (507) is mounted with a driving bevel gear (508); the driven bevel gear (301) is mounted on one end of the worm (3) close to the fixed cover (501); The screw-out member is used to drive the rotating shaft (507) to move along the axial direction of the fixed cover (501), so that the active bevel gear (508) is meshed with the driven bevel gear (301), or the active bevel gear (508) is disengaged from the driven bevel gear (301).

2. The hand-cranked reducer according to claim 1 is characterized in that: The screw-out member comprises a screw-out sleeve (503) and a screw-out seat (504); the screw-out seat (504) is arranged inside the fixed cover (501) and is threadedly connected to the inner wall of the fixed cover (501); one end of the screw-out sleeve (503) extends into the interior of the fixed cover (501) and is fixed to the side surface of the screw-out seat (504); one end of the rotating shaft (507) extends into the interior of the screw-out sleeve (503) and is rotatably connected to the screw-out sleeve (503).

3. The hand-cranked reducer according to claim 2 is characterized in that: A flange is provided on the end surface of the screw-out sleeve (503) close to the screw-out seat (504), and the flange is connected to the side surface of the screw-out seat (504) via a fixing bolt (505).

4. The hand-cranked reducer according to claim 2 is characterized in that: A connecting bearing (506) is provided on the inner wall of the screw-out seat (504), and the connecting bearing (506) is cooperatively connected to the rotating shaft (507).

5. The hand-cranked reducer according to claim 2 is characterized in that: A plurality of threaded holes are evenly arranged on the end surface of the fixing cover (501) around its axis, and a locking bolt (502) is screwed into each of the threaded holes, and the fixing cover (501) is connected to the reducer via the locking bolt (502).

6. The hand-cranked reducer according to claim 2 is characterized in that: An annular gap is formed between the outer wall of the screw-out sleeve (503) and the inner wall of the circular hole of the fixed cover (501), and an oil seal (509) is installed in the annular gap.

7. The hand-cranked reducer according to claim 2 is characterized in that: A second oil seal (510) is installed on the inner wall of the screw-out sleeve (503), and one end of the rotating shaft (507) extends into the screw-out sleeve (503) and passes through the second oil seal (510).

8. The hand-cranked reducer according to claim 2 is characterized in that: The hand-cranked reducer also includes a crank handle used in conjunction with the rotating shaft (507) with the hand-cranked mechanism.

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