A lubricated winch power transmission gearbox for a constant-tension winch

Abstract

The present invention discloses a lubricated winch power transmission gearbox for a constant tension winch, which relates to the field of gearboxes and includes a box body, an input shaft, a reduction mechanism, and an output shaft. The input shaft is installed on the left side of the box body, and a reduction mechanism is connected to the right side of the input shaft, and an output shaft is connected to the right side of the reduction mechanism. A circulating lubrication mechanism is arranged inside the box body to lubricate the components inside the box body. The reduction mechanism includes a transmission shaft, a meshing wheel, and a transmission gear set. The transmission shaft is rotatably installed inside the box body, and a meshing wheel is arranged on the surface of the transmission shaft. The lubricated winch power transmission gearbox for the constant tension winch provides rotational power for the output shaft through the meshing of the meshing wheel and the input shaft, and the meshing wheel can move on the transmission shaft, so as to realize the connection control with the input shaft. Subsequently, when manually controlling the transmission shaft, disconnecting the connection between the meshing wheel and the input shaft can avoid the meshing wheel being locked.

Description

Technical Field

[0001] The present invention relates to the technical field of gearboxes, and particularly to a lubricated winch power transmission gearbox for a constant-tension winch. Background Art

[0002] A gearbox, also known as a speed reducer, is a common speed reduction transmission mechanism. On a constant-tension winch, the gearbox can provide rotational power for its winch to achieve control of the winch, thereby enabling the lifting of corresponding items.

[0003] Prior Art 1 (a Chinese patent with application number CN202321711191.3, published on October 20, 2023) is a gearbox lubrication structure for a marine winch, including an input-stage sunken structure provided on the gearbox; the input-stage sunken structure includes an input shaft provided on the housing of the gearbox and an input-stage bearing sleeved on the input shaft; the axis of the input shaft is located below the oil level line of the gearbox. The utility model optimizes the structure of the winch gearbox, improves the lubrication method of the marine winch gearbox, enhances the reliability of the gearbox, and ensures that the rollers of the high-speed-stage bearings of the gearbox can still be fully lubricated when the ship tilts; Prior Art 2 (a Chinese patent with application number CN202211324865.4, published on January 10, 2023) is a gearbox for a constant-tension winch. The gearbox housing is welded by steel plates, and the housing cover is fixed to the gearbox housing through screws and washers. There is one large gear and one small gear with fully meshed external teeth in the gearbox cavity; each gear is fixed at both ends by bearings respectively. An hoisting motor and a constant-tension motor are respectively installed outside the gearbox; the internal teeth of the small gear are meshed with the output shaft of the constant-tension motor; the internal teeth of the large gear and the outer ring of the backstop are fixed by screws; the inner ring of the backstop is meshed with the output shaft of the hoisting motor; the output shaft of the large gear is meshed with a speed reducer. The backstop has the characteristic of only rotating in one direction; when the output shaft of the hoisting motor rotates forward, it drives the inner ring of the backstop to rotate, and the outer ring of the backstop synchronizes with the inner ring, and then drives the large gear to rotate, and the winch winds the rope and lifts the goods.

[0004] Although the current gearbox can be connected to the winch to achieve corresponding power control, generally, the gearbox can only be driven by an electric motor. When an unexpected situation such as power failure occurs during use, for example, if an item is suspended in the air and manual control of the winch cannot be carried out in time, the safety of the device in use is reduced, and sometimes the locking of the gearbox depends on the electric motor, and rotation control of the gearbox cannot be continued when the electric motor fails. Summary of the Invention

[0005] The object of the present invention is to provide a lubricated winch power transmission gearbox for a constant-tension winch, so as to solve the problem proposed in the above background technology that although the current gearbox can be connected to the winch to achieve corresponding power control, the gearbox can generally only be driven by an electric motor. When an accident occurs during use, such as a power outage, if an item is suspended in the air, the winch cannot be manually controlled in time, reducing the safety of the device during use.

[0006] To achieve the above object, the present invention provides the following technical solution: A lubricated winch power transmission gearbox for a constant-tension winch, comprising a box body, an input shaft, a deceleration mechanism, and an output shaft. The input shaft is installed on the left side of the box body, and a deceleration mechanism is connected to the right side of the input shaft. The input shaft is connected to the output shaft through the deceleration mechanism. A circulating lubrication mechanism is arranged inside the box body to lubricate the components inside the box body. The deceleration mechanism includes a transmission shaft, a meshing wheel, and a transmission gear set. The transmission shaft is rotatably installed inside the box body, and a meshing wheel is arranged on the surface of the transmission shaft. The meshing wheel meshes with the input shaft. A transmission gear set is arranged on the surface of the transmission shaft, and the transmission shaft is connected to the output shaft through the transmission gear set. A front-back sliding structure is formed between the meshing wheel and the transmission shaft, and a rotation limiting mechanism is arranged behind the meshing wheel to provide limit control for the rotation of the transmission shaft. A forward movement control mechanism is arranged in front of the meshing wheel to control the connection between the meshing wheel and the input shaft. A manual driving mechanism is arranged behind the transmission shaft to provide a manual driving effect for the output shaft.

[0007] Further optimizing the technical solution, the circulating lubrication mechanism includes a circulating pipe, a pump body, a heat dissipation module, and a return pipe;

[0008] The circulating pipe is arranged at the bottom of the box body;

[0009] The pump body is connected to the circulating pipe to pump the oil inside the box body;

[0010] The heat dissipation module is arranged above the box body, and the upper end of the circulating pipe is connected to the heat dissipation module;

[0011] The return pipe is arranged outside the heat dissipation module to send the heat-dissipated oil back into the box body.

[0012] Further optimizing the technical solution, a filter plate is arranged at the bottom of the box body to filter the oil entering the circulating pipe, and an anti-blocking mechanism is arranged outside the filter plate.

[0013] Further optimizing the technical solution, the anti-blocking mechanism includes a movable shaft, a bevel gear, a mounting shaft, a stirring rod, and a scraping plate;

[0014] The movable shaft is arranged below the output shaft;

[0015] The bevel gear is arranged above the movable shaft, and the movable shaft is engaged with the output shaft through the bevel gear;

[0016] The mounting shaft is fixed below the movable shaft;

[0017] The stirring rod is fixed above the mounting shaft;

[0018] The scraping plate is fixed at the end of the stirring rod, and the scraping plate is in contact with the surface of the filter plate.

[0019] To further optimize this technical solution, the forward movement control mechanism includes a fixed plate, a first spring, a fitting ring, a magnetic block, a support plate and an electromagnet;

[0020] The fixed plate is fixed inside the box body;

[0021] The first spring is fixed at the rear side of the fixed plate;

[0022] The fitting ring is fixed at the rear side of the first spring, and the fitting ring is sleeved outside the transmission shaft;

[0023] The magnetic block is arranged between the front side of the meshing wheel and the meshing wheel to form a sliding connection;

[0024] The support plate is fixed inside the box body, and the magnetic block and the support plate form a nested connection;

[0025] The electromagnet is fixed at the rear side of the fixed plate. When the electromagnet is energized, it attracts the magnetic block to make the meshing wheel and the input shaft engage with each other.

[0026] To further optimize this technical solution, a connection head is fixed at the rear end of the magnetic block. The rear end of the connection head is designed in an enlarged shape, and the connection head and the meshing wheel form a sliding connection.

[0027] To further optimize this technical solution, the rotation limiting mechanism includes a locking block, a positioning ring, a driving plate, a positioning groove and a support ring;

[0028] The locking block is fixed at the rear side of the meshing wheel;

[0029] The positioning ring is arranged at the rear side of the locking block;

[0030] The driving plate is fixed outside the positioning ring to provide support for the positioning ring;

[0031] The positioning groove is opened at the front side of the positioning ring, and the positioning groove and the locking block form a clamping structure;

[0032] The support ring is fixed outside the transmission shaft, and the support ring is located at the rear side of the meshing wheel.

[0033] To further optimize this technical solution, the manual driving mechanism includes a first gear, a second gear, a manual control shaft, a turning handle and a release mechanism;

[0034] The first gear is fixed to the rear side of the transmission shaft;

[0035] The second gear is arranged on the left side of the first gear and meshes with the first gear, and the second gear is rotatably connected to the box body;

[0036] The manual control shaft is arranged in the middle of the second gear;

[0037] The handlebar is arranged at the rear end of the manual control shaft to control the rotation of the manual control shaft;

[0038] The release mechanism is arranged inside the second gear to control the connection between the second gear and the manual control shaft.

[0039] To further optimize this technical solution, the release mechanism includes a connection block, a second spring, a connection groove, a connection rope, a control block, a connection shaft and a control rod;

[0040] The connection block is arranged inside the manual control shaft;

[0041] The second spring is arranged at the inner end of the connection block to provide a thrust force for the connection block;

[0042] The connection grooves are evenly arranged inside the second gear, and the connection grooves and the connection block form a concave-convex matching structure;

[0043] The connection rope is fixed to the inner end of the connection block;

[0044] The control block is arranged inside the manual control shaft and forms a front-back sliding structure with the manual control shaft, and the control block is fixedly connected to the connection rope;

[0045] The connection shaft is fixed to the front side of the control block, and the front end of the connection shaft is rotatably connected to the driving plate, and the driving plate forms a front-back sliding structure with the box body;

[0046] The control rod is rotatably installed at the rear side of the control block, and the rear end of the control rod penetrates through the manual control shaft and forms a threaded connection with the manual control shaft.

[0047] To further optimize this technical solution, a limiting rod penetrates through the handlebar, and the limiting rod forms a threaded connection with the handlebar.

[0048] Compared with the prior art, the beneficial effects of the present invention are:

[0049] The rotation power is provided for the output shaft through the meshing of the meshing wheel and the input shaft, and the meshing wheel can move on the transmission shaft, so as to realize the connection control with the input shaft. When manually controlling the transmission shaft later, disconnecting the connection between the meshing wheel and the input shaft can prevent the meshing wheel from being locked.

[0050] After the electromagnet is powered off, the first spring can push the meshing wheel to move, disconnecting the meshing between the meshing wheel and the input shaft. At the same time, the connection between the locking block and the positioning groove can continue to limit the rotation of the meshing wheel, so that the transmission shaft can remain locked when the device is powered off or a fault occurs externally.

[0051] The circulating pipe is used to circulate and pump the oil in the box body, and cooperate with the return pipe to send the oil back to lubricate the transmission components in the box body. And when the oil is circulating, it can be cooled by cooperating with the heat dissipation module. The cooled oil sent back to the box body can also play a role in dissipating heat from the device.

[0052] The circulating oil is filtered by the filter plate, and the scraper arranged outside the filter plate can scrape off the impurities blocking the surface of the filter plate to prevent blockage at the filter plate. At the same time, the movement of the scraper can also play a role in stirring the oil.

[0053] The manual control shaft can provide manual control for the rotation of the output shaft. And when the manual control shaft is operated, the meshing wheel will disengage from the meshing connection with the input shaft, avoiding its rotation being restricted by the input shaft, so that the device can also perform temporary drive control without relying on an external motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a three-dimensional structural schematic diagram of the present invention;

[0055] Figure 2 It is a rear-view structural schematic diagram of the present invention;

[0056] Figure 3 It is a top-view structural schematic diagram of the interior of the box body of the present invention;

[0057] Figure 4 It is a main cross-sectional structural schematic diagram of the box body of the present invention;

[0058] Figure 5 It is a side-view structural schematic diagram of the transmission shaft of the present invention;

[0059] Figure 6 It is a three-dimensional structural schematic diagram of the meshing wheel of the present invention;

[0060] Figure 7 It is a side cross-sectional structural schematic diagram of the meshing wheel of the present invention;

[0061] Figure 8 It is a side cross-sectional structural schematic diagram of the manual control shaft of the present invention;

[0062] Figure 9 It is a main cross-sectional structural schematic diagram of the second gear of the present invention;

[0063] Figure 10 It is a top-view structural schematic diagram of the movable shaft of the present invention.

[0064] In the figure: 1. Box body; 2. Input shaft; 3. Transmission shaft; 4. Meshing gear; 5. Output shaft; 6. Transmission gear set; 7. Movable shaft; 8. Bevel gear; 9. Mounting shaft; 10. Stirring rod; 11. Scraper; 12. Filter plate; 13. Circulation pipe; 14. Pump body; 15. Heat dissipation module; 16. Return pipe; 17. Fixed plate; 18. First spring; 19. Fitting ring; 20. Connector; 21. Magnet; 22. Support plate; 23. Electromagnet; 24. Locking block; 25. Positioning ring; 2501. Driving plate; 26. Positioning groove; 27. Support ring; 28. First gear; 29. Second gear; 30. Manual control shaft; 31. Rotating handle; 32. Limit rod; 33. Connecting block; 34. Second spring; 35. Connecting groove; 36. Connecting rope; 37. Control block; 38. Connecting shaft; 39. Control rod. Detailed implementation mode

[0065] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present invention.

[0066] Please refer to Figures 1 - 10 , the present invention provides the following technical solutions: A lubricated winch power transmission gearbox for a constant tension winch, comprising a box body 1, an input shaft 2, a speed reduction mechanism, and an output shaft 5. The input shaft 2 is installed on the left side of the box body 1, and the right side of the input shaft 2 is connected with a speed reduction mechanism, and the input shaft 2 is connected to the output shaft 5 through the speed reduction mechanism;

[0067] Embodiment 1: The present invention provides the following technical solutions, and discloses that a circulating lubrication mechanism is arranged inside the box body 1 to lubricate the components inside the box body 1. The speed reduction mechanism includes a transmission shaft 3, a meshing gear 4, and a transmission gear set 6. The transmission shaft 3 is rotatably installed inside the box body 1, and a meshing gear 4 is arranged on the surface of the transmission shaft 3. The meshing gear 4 meshes with the input shaft 2. A transmission gear set 6 is arranged on the surface of the transmission shaft 3. The transmission shaft 3 is connected to the output shaft 5 through the transmission gear set 6. A front-back sliding structure is formed between the meshing gear 4 and the transmission shaft 3. A rotation limiting mechanism is arranged at the rear side of the meshing gear 4 to provide limit control for the rotation of the transmission shaft 3. A forward movement control mechanism is arranged at the front side of the meshing gear 4 to control the connection between the meshing gear 4 and the input shaft 2. A manual driving mechanism is arranged at the rear side of the transmission shaft 3 to provide a manual driving effect for the output shaft 5.

[0068] The input shaft 2 can be connected to an external driving motor, and the output shaft 5 is connected to a winch. During use, the input shaft 2 drives the transmission shaft 3 to rotate through the meshing gear 4, and the transmission shaft 3 drives the output shaft 5 to rotate through the transmission gear set 6. When the rotation stops, the self-locking of the motor can provide a locking effect. In case of failure or accidental power-off, etc., the transmission shaft 3 can also be limited by the rotation limiting mechanism to keep the output shaft 5 stable. The output shaft 5 can also be rotated by the manual driving mechanism for temporary hoisting control.

[0069] Embodiment 2: On the basis of Embodiment 1, a circulating lubrication mechanism is disclosed, which includes a circulating pipe 13, a pump body 14, a heat dissipation module 15 and a return pipe 16. The circulating pipe 13 is arranged at the bottom of the box body 1. The pump body 14 is connected to the circulating pipe 13 to pump the oil in the box body 1. The heat dissipation module 15 is arranged above the box body 1, and the upper end of the circulating pipe 13 is connected to the heat dissipation module 15. The return pipe 16 is arranged outside the heat dissipation module 15 to send the cooled oil back into the interior of the box body 1. A filter plate 12 is arranged at the bottom of the box body 1 to filter the oil entering the circulating pipe 13, and an anti-blocking mechanism is arranged outside the filter plate 12. The anti-blocking mechanism includes a movable shaft 7, a bevel gear 8, a mounting shaft 9, a stirring rod 10 and a scraping plate 11. The movable shaft 7 is arranged below the output shaft 5. The bevel gear 8 is arranged above the movable shaft 7. The movable shaft 7 is engaged with the output shaft 5 through the bevel gear 8. The mounting shaft 9 is fixed below the movable shaft 7. The stirring rod 10 is fixed above the mounting shaft 9. The scraping plate 11 is fixed at the end of the stirring rod 10, and the scraping plate 11 is in contact with the surface of the filter plate 12.

[0070] The oil in the box body 1 can be pumped out through the pump body 14 and the circulating pipe 13, and after being cooled by the heat dissipation module 15, it returns to the box body 1 again to achieve the effects of cooling and lubrication. The oil entering the circulating pipe 13 is filtered by the filter plate 12. When the output shaft 5 rotates, the movable shaft 7 will be driven to rotate through the bevel gear 8. The movable shaft 7 drives the mounting shaft 9 and the stirring rod 10 to rotate to stir the oil, and at the same time drives the scraping plate 11 to move to clean the impurities on the surface of the filter plate 12 to prevent the filter plate 12 from being blocked.

[0071] Embodiment 3: On the basis of Embodiment 1, it is disclosed that the forward movement control mechanism includes a fixed plate 17, a first spring 18, a fitting ring 19, a magnetic block 21, a support plate 22, and an electromagnet 23. The fixed plate 17 is fixed inside the box body 1. The first spring 18 is fixed on the rear side of the fixed plate 17. The fitting ring 19 is fixed on the rear side of the first spring 18 and is sleeved outside the transmission shaft 3. The magnetic block 21 is arranged between the front sides of the meshing wheels 4 and forms a sliding connection therewith. The support plate 22 is fixed inside the box body 1, and a nested connection is formed between the magnetic block 21 and the support plate 22. The electromagnet 23 is fixed on the rear side of the fixed plate 17. When the electromagnet 23 is energized, it attracts the magnetic block 21 to make the meshing wheel 4 and the input shaft 2 mesh with each other. A connection head 20 is fixed to the rear end of the magnetic block 21. The rear end of the connection head 20 is designed with an enlarged structure, and a sliding connection is formed between the connection head 20 and the meshing wheel 4. The rotation limiting mechanism includes a locking block 24, a positioning ring 25, a driving plate 2501, a positioning groove 26, and a support ring 27. The locking block 24 is fixed on the rear side of the meshing wheel 4. The positioning ring 25 is arranged on the rear side of the locking block 24. The driving plate 2501 is fixed on the outer side of the positioning ring 25 to provide support for the positioning ring 25. The positioning groove 26 is opened on the front side of the positioning ring 25, and a clamping structure is formed between the positioning groove 26 and the locking block 24. The support ring 27 is fixed outside the transmission shaft 3 and is located on the rear side of the meshing wheel 4. The manual driving mechanism includes a first gear 28, a second gear 29, a manual control shaft 30, a handle 31, and a release mechanism. The first gear 28 is fixed on the rear side of the transmission shaft 3. The second gear 29 is arranged on the left side of the first gear 28 and forms a meshing connection therewith, and the second gear 29 is rotatably connected to the box body 1. The manual control shaft 30 is arranged in the middle of the second gear 29. The handle 31 is arranged at the rear end of the manual control shaft 30 to control the rotation of the manual control shaft 30. The release mechanism is arranged inside the second gear 29 to control the connection between the second gear 29 and the manual control shaft 30. The release mechanism includes a connection block 33, a second spring 34, a connection groove 35, a connection rope 36, a control block 37, a connection shaft 38, and a control rod 39. The connection block 33 is arranged inside the manual control shaft 30. The second spring 34 is arranged at the inner end of the connection block 33 to provide a thrust for the connection block 33. The connection grooves 35 are uniformly opened inside the second gear 29, and a concave-convex matching structure is formed between the connection grooves 35 and the connection block 33. The connection rope 36 is fixed to the inner end of the connection block 33. The control block 37 is arranged inside the manual control shaft 30 and forms a front-back sliding structure with the manual control shaft 30, and the control block 37 is fixedly connected to the connection rope 36. The connection shaft 38 is fixed on the front side of the control block 37, and the front end of the connection shaft 38 is rotatably connected to the driving plate 2501, and a front-back sliding structure is formed between the driving plate 2501 and the box body 1. The control rod 39 is rotatably installed on the rear side of the control block 37.Moreover, the rear end of the control rod 39 passes through between the manual control shaft 30 and forms a threaded connection therewith, and a limiting rod 32 passes through the inside of the handle grip 31, and a threaded connection is formed between the limiting rod 32 and the handle grip 31.

[0072] During normal use, the electromagnet 23 is energized to attract the magnetic block 21, and the meshing wheel 4 is pulled to mesh with the input shaft 2 to achieve transmission. When powered off, the electromagnet 23 is de-energized, and the first spring 18 will push the meshing wheel 4 to move backward, so that the locking block 24 and the positioning groove 26 are connected to continue locking the transmission shaft 3. When manual drive control is required, the control rod 39 can be rotated first to drive the control block 37 to move. The control block 37 releases the pulling of the connecting rope 36, so that the connecting block 33 returns to connect with the connecting groove 35. At the same time, the control block 37 drives the driving plate 2501 to move through the connecting shaft 38, so that the driving plate 2501 drives the positioning ring 25 to move, releases the connection between the positioning groove 26 and the locking block 24, and restores the rotatable state of the transmission shaft 3. Then, the limiting rod 32 is rotated, and the manual control shaft 30 can be rotated through the handle grip 31, and the meshing of the second gear 29 and the first gear 28 provides power for the transmission shaft 3.

[0073] The content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0074] Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A lubricated winch power transmission gearbox for a constant tension winch, comprising a box body (1), an input shaft (2), a reduction mechanism, and an output shaft (5). The input shaft (2) is installed on the left side of the box body (1), and a reduction mechanism is connected to the right side of the input shaft (2). The input shaft (2) is connected to the output shaft (5) through the reduction mechanism; It is characterized in that: A circulating lubrication mechanism is arranged inside the box body (1) to lubricate the components inside the box body (1). The reduction mechanism includes a transmission shaft (3), a meshing wheel (4), and a transmission gear set (6). The transmission shaft (3) is rotatably installed inside the box body (1), and a meshing wheel (4) is arranged on the surface of the transmission shaft (3). The meshing wheel (4) meshes with the input shaft (2). A transmission gear set (6) is arranged on the surface of the transmission shaft (3). The transmission shaft (3) is connected to the output shaft (5) through the transmission gear set (6). A front-back sliding structure is formed between the meshing wheel (4) and the transmission shaft (3). A rotation limiting mechanism is arranged at the rear side of the meshing wheel (4) to provide limit control for the rotation of the transmission shaft (3). A forward movement control mechanism is arranged at the front side of the meshing wheel (4) to control the connection between the meshing wheel (4) and the input shaft (2). A manual driving mechanism is arranged at the rear side of the transmission shaft (3) to provide a manual driving effect for the output shaft (5); The manual driving mechanism includes a first gear (28), a second gear (29), a manual control shaft (30), a handle (31), and a release mechanism; The first gear (28) is fixed to the rear side of the transmission shaft (3); The second gear (29) is arranged on the left side of the first gear (28) and forms a meshing connection with the first gear (28), and the second gear (29) is rotatably connected to the box body (1); The manual control shaft (30) is arranged in the middle of the second gear (29); The handle (31) is arranged at the rear end of the manual control shaft (30) to control the rotation of the manual control shaft (30); The release mechanism is arranged inside the second gear (29) to control the connection between the second gear (29) and the manual control shaft (30).

2. The lubricated winch power transmission gearbox of a constant tension winch according to claim 1, characterized in that: The circulating lubrication mechanism includes a circulating pipe (13), a pump body (14), a heat dissipation module (15), and a return pipe (16); The circulating pipe (13) is arranged at the bottom of the box body (1); The pump body (14) is connected to the circulating pipe (13) to pump the oil inside the box body (1); The heat dissipation module (15) is arranged above the box body (1), and the upper end of the circulating pipe (13) is connected to the heat dissipation module (15); The return pipe (16) is arranged outside the heat dissipation module (15) to send the heat-dissipated oil back into the box body (1).

3. The lubricated winch power transmission gearbox of a constant-tension winch according to claim 2, wherein: A filter plate (12) is arranged at the bottom of the box body (1) to filter the oil entering the circulating pipe (13), and an anti-blocking mechanism is arranged outside the filter plate (12).

4. The lubricated winch power transmission gearbox of a constant-tension winch according to claim 3, wherein: The anti-blocking mechanism includes a movable shaft (7), a bevel gear (8), a mounting shaft (9), a stirring rod (10), and a scraping plate (11); The movable shaft (7) is arranged below the output shaft (5); The bevel gear (8) is arranged above the movable shaft (7), and the movable shaft (7) is meshed with the output shaft (5) through the bevel gear (8); The mounting shaft (9) is fixed below the movable shaft (7); The stirring rod (10) is fixed above the mounting shaft (9); The scraping plate (11) is fixed at the end of the stirring rod (10), and the scraping plate (11) is attached to the surface of the filter plate (12).

5. The lubricated winch power transmission gearbox of a constant-tension winch according to claim 1, characterized in that: The forward movement control mechanism includes a fixing plate (17), a first spring (18), a fitting ring (19), a magnetic block (21), a support plate (22) and an electromagnet (23); The fixing plate (17) is fixed inside the box body (1); The first spring (18) is fixed at the rear side of the fixing plate (17); The fitting ring (19) is fixed at the rear side of the first spring (18), and the fitting ring (19) is sleeved outside the transmission shaft (3); The magnetic block (21) is arranged at the front side between the meshing wheels (4) and forms a sliding connection therebetween; The support plate (22) is fixed inside the box body (1), and a nested connection is formed between the magnetic block (21) and the support plate (22); The electromagnet (23) is fixed at the rear side of the fixing plate (17). When the electromagnet (23) is energized, it attracts the magnetic block (21) to make the meshing wheel (4) and the input shaft (2) mesh with each other.

6. The lubricated winch power transmission gearbox of a constant tension winch according to claim 5, characterized in that: A connecting head (20) is fixed at the rear end of the magnetic block (21). The rear end of the connecting head (20) is designed with an enlarged structure, and a sliding connection is formed between the connecting head (20) and the meshing wheel (4).

7. The lubricated winch power transmission gearbox of a constant-tension winch according to claim 5, characterized in that: The rotation limiting mechanism includes a locking block (24), a positioning ring (25), a driving plate (2501), a positioning groove (26) and a support ring (27); The locking block (24) is fixed at the rear side of the meshing wheel (4); The positioning ring (25) is arranged at the rear side of the locking block (24); The driving plate (2501) is fixed outside the positioning ring (25) to provide support for the positioning ring (25); The positioning groove (26) is opened at the front side of the positioning ring (25), and a clamping structure is formed between the positioning groove (26) and the locking block (24); The support ring (27) is fixed outside the transmission shaft (3), and the support ring (27) is located at the rear side of the meshing wheel (4).

8. The lubricated winch power transmission gearbox of a constant-tension winch according to claim 1, characterized in that: The release mechanism includes a connecting block (33), a second spring (34), a connecting groove (35), a connecting rope (36), a control block (37), a connecting shaft (38) and a control rod (39); The connecting block (33) is arranged inside the manual control shaft (30); The second spring (34) is arranged at the inner end of the connecting block (33) to provide a thrust for the connecting block (33); The connecting grooves (35) are evenly opened inside the second gear (29), and a concave-convex matching structure is formed between the connecting grooves (35) and the connecting block (33); The connecting rope (36) is fixed at the inner end of the connecting block (33); The control block (37) is arranged inside the manual control shaft (30) and forms a front-back sliding structure with the manual control shaft (30), and the control block (37) is fixedly connected with the connecting rope (36); The connecting shaft (38) is fixed to the front side of the control block (37), and the front end of the connecting shaft (38) is rotatably connected to the driving plate (2501), and a front-back sliding structure is formed between the driving plate (2501) and the box body (1); The control rod (39) is rotatably installed on the rear side of the control block (37), and the rear end of the control rod (39) penetrates through the manual control shaft (30) and a threaded connection is formed between them.

9. The lubricated winch power transmission gearbox of a constant-tension winch according to claim 1, characterized in that: A limiting rod (32) penetrates through the inside of the handle grip (31), and a threaded connection is formed between the limiting rod (32) and the handle grip (31).

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