Limiting protection type constant tension winch transmission gear box

Abstract

The invention discloses a limit protection type constant tension winch transmission gear box, and relates to the field of transmission gear boxes, the limit protection type constant tension winch transmission gear box comprises a box body, an input shaft and an output shaft, the input shaft is installed on the rear side of the box body, the output shaft is installed on the front side of the box body, and the input shaft and the output shaft are both rotatably connected with the box body. A first gear is fixed to the front end of the input shaft, a second gear is meshed with the right side of the first gear, a mounting shaft is fixed to the middle of the second gear, a third gear is fixed to the front side of the mounting shaft, and a fourth gear is meshed with the left side of the third gear. According to the limiting protection type constant-tension winch transmission gear box, first-stage speed reduction is achieved through cooperation of the first gear and the second gear, second-stage speed reduction is achieved through cooperation of the third gear and the fourth gear, third-stage speed reduction is achieved through cooperation of the fifth gear and the sixth gear, the transmission effect can be adjusted according to use requirements, and therefore power of the output shaft can be adjusted; and the transmission effect can be fully utilized.

Description

Technical Field

[0001] The invention relates to the technical field of transmission gear boxes, in particular to a position-limiting protection type constant tension winch transmission gear box. Background Art

[0002] The transmission gearbox is the core component of the mechanical transmission system. Its main function is to change the speed and torque to meet the operating requirements of different mechanical equipment. In the fields of transportation, lifting winches and other automation equipment, the transmission gearbox plays a vital role. It can also be used in conjunction with the constant tension winch to control the winch's transmission.

[0003] Prior art 1 (application number CN202211324865.4, Chinese invention patent published on January 10, 2023) A gearbox for a constant tension winch, the gearbox housing is welded from steel plates, and the housing cover is fixed to the gearbox housing by screws and washers. A large gear and a small gear with fully meshed external teeth are installed in the gearbox cavity; each gear is fixed by bearings at both ends. A lifting motor and a constant tension motor are installed on the outside of the gearbox; the inner teeth of the small gear mesh with the output shaft of the constant tension motor; the inner teeth of the large gear and the outer ring of the backstop are fixed by screws; the inner ring of the backstop meshes with the output shaft of the lifting motor; the output shaft of the large gear meshes with the reducer. The backstop has the characteristic of only being able to operate in one direction; when the output shaft of the lifting motor rotates in the forward direction, it drives the inner ring of the backstop to rotate, and the outer ring of the backstop is synchronized with the inner ring, which in turn drives the large gear to rotate, and the winch reels in the rope and lifts the cargo; Prior art 2 (application number CN202223173349.4, a Chinese utility model patent published on April 7, 2023) A gearbox with a protective device, comprising: a gearbox body, a transmission shaft, the transmission shaft is arranged inside the gearbox body, the right end of the transmission shaft passes through the gearbox body and extends to the outside thereof, a protective limiting mechanism, the protective limiting mechanism is arranged on the gearbox body, the protective limiting mechanism includes a protective shell, the protective shell is arranged on the right side of the gearbox body, and mounting blocks are installed on the left side of the top and bottom of the protective shell, and a card slot is opened on the left side of the mounting block. This application facilitates the protection of the transmission shaft through the mutual cooperation of the protective shell, mounting block, slot, block, pull block, fixing rod, fixing block, limit block, limit slot and elastic part, thereby preventing the transmission shaft from being easily damaged by foreign objects during transportation of the gearbox, improving the protection effect, and allowing the protective limit mechanism to be recycled, avoiding waste of resources and improving practicality.

[0004] The deceleration effect inside the current transmission gearbox is generally constant. When the weight of the hoisted object increases, the speed cannot be reduced to increase the torque, and when the weight of the hoisted object decreases, the speed cannot be increased. As a result, the motor transmission cannot be fully utilized and is prone to damage to the motor. Summary of the Invention

[0005] The purpose of the present invention is to provide a limited protection type constant tension winch transmission gearbox to solve the problem raised in the above background technology that the deceleration effect inside the current transmission gearbox is generally constant, and when the weight of the hoisted object increases, the speed cannot be reduced to increase the torque, and when the weight of the hoisted object decreases, the speed cannot be increased, resulting in the motor transmission cannot be fully utilized.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a limited protection type constant tension winch transmission gearbox, comprising a box body, an input shaft and an output shaft, the input shaft being installed on the rear side of the box body, and the output shaft being installed on the front side of the box body, the input shaft and the output shaft both forming a rotational connection with the box body, a first gear being fixed to the front end of the input shaft, a second gear being engaged with the right side of the first gear, and a mounting shaft being fixed to the middle part of the second gear, and a third gear being fixed to the front side of the mounting shaft, a fourth gear being engaged with the left side of the third gear, and a connecting shaft being fixed to the middle part of the fourth gear, a rotational connection being formed between the connecting shaft and the box body, a transmission mechanism being provided between the connecting shaft and the output shaft, and the transmission between the output shaft, the connecting shaft and the mounting shaft being controlled by the transmission mechanism.

[0007] To further optimize the technical solution, a support seat is fixed inside the box body, the support seat is arranged between the front end of the input shaft and the input shaft to form a rotational connection, and the support seat and the rear end of the connecting shaft form a rotational connection.

[0008] To further optimize the technical solution, a limit protection mechanism is provided on the outer side of the output shaft to lock the rotation of the output shaft.

[0009] Further optimizing the technical solution, the position limiting protection mechanism includes a locking tooth, a locking block and a first retractor;

[0010] Locking teeth, fixed on the outside of the output shaft;

[0011] A locking block is arranged on the outer side of the locking tooth and between the locking teeth to form a locking structure;

[0012] The first retractor is connected to the locking block to control the horizontal movement of the locking block.

[0013] Further optimizing the technical solution, the transmission mechanism includes a synchronous gear, a fifth gear, a sixth gear, a support plate, a driving mechanism and a switching mechanism;

[0014] Synchronous gears are arranged on the surfaces of the connecting shaft and the output shaft, and the two sets of synchronous gears are meshed with each other, and the synchronous gears and the output shaft as well as the connecting shaft are all nested;

[0015] The fifth gear is sleeved on the outer side of the connecting shaft and is located in front of the synchronous gear;

[0016] a sixth gear, sleeved on the outer side of the output shaft, and meshingly connected with the fifth gear;

[0017] A support plate is provided on the outer sides of the synchronous gear, the fifth gear and the sixth gear to provide positioning for them;

[0018] A driving mechanism is provided inside the connecting shaft and the output shaft, and controls the connection between the connecting shaft and the synchronous gear and the fifth gear, and between the output shaft and the synchronous gear and the sixth gear;

[0019] The switching mechanism is arranged on the front side of the mounting shaft, and the horizontal center line of the mounting shaft and the horizontal center line of the output shaft are arranged to coincide with each other.

[0020] To further optimize the technical solution, balls are provided on the front and rear sides of the synchronous gear, the front and rear sides of the fifth gear, and the front and rear sides of the sixth gear, and the balls are fitted to the support plate.

[0021] Further optimizing the technical solution, the driving mechanism includes a docking block, a first spring, a docking groove, a first trigger block, a second spring, a second trigger block and a third spring;

[0022] A docking block is provided inside the output shaft and the connecting shaft;

[0023] a first spring, arranged on the outside of the docking block to provide an inward thrust to the docking block;

[0024] Docking grooves are provided at equal angles inside the synchronous gear, the fifth gear and the sixth gear, and a locking structure is formed between the docking grooves and the docking blocks;

[0025] The first trigger block is arranged on the inner side of the docking block, and the surface of the first trigger block is designed to be inclined;

[0026] a second spring, arranged on the outer side of the first trigger block to provide a backward thrust to the first trigger block;

[0027] The second trigger block is arranged in front of the first trigger block, and the second trigger block is in contact with the fifth gear and the docking block inside the sixth gear;

[0028] The third spring is arranged on the front side of the second trigger block.

[0029] Further optimizing the technical solution, the switching mechanism includes a first transmission block, a transmission head, a transmission slot, an empty slot, a second transmission block and a control mechanism;

[0030] A first transmission block is arranged at the front end of the mounting shaft, and a front-to-back sliding structure is formed between the first transmission block and the mounting shaft;

[0031] A transmission head is fixed to the front end of the first transmission block;

[0032] The transmission groove is provided at the rear end of the output shaft, and a concave-convex matching structure is formed between the transmission groove and the transmission head;

[0033] The empty slot is provided at the front end of the transmission slot, the transmission head enters the empty slot and idles, and the rear end of the locking first trigger block is located inside the empty slot;

[0034] The second transmission block is arranged inside the connecting shaft and between the connecting shafts to form a forward and backward sliding structure;

[0035] The control mechanism is arranged outside the first transmission block and synchronously controls the movement of the first transmission block and the second transmission block.

[0036] Further optimizing the technical solution, the control mechanism includes a connecting head, a driving seat, a connecting groove and a second retractor;

[0037] A connector fixed to the surfaces of the first transmission block and the second transmission block;

[0038] The driving seat is sleeved on the outside of the connecting shaft and the output shaft;

[0039] The connecting groove is annularly provided on the rear side of the driving seat, and a sliding connection is formed between the connecting groove and the connecting head;

[0040] The second telescoping device is fixed on the front side of the driving seat to control the movement of the driving seat.

[0041] To further optimize the technical solution, the front end of the connector is designed to be an enlarged structure, and the connectors are arranged in pairs on the surfaces of the first transmission block and the second transmission block.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] (1) The first gear and the second gear cooperate to achieve a first-stage deceleration, the third gear and the fourth gear cooperate to achieve a second-stage deceleration, and the fifth gear and the sixth gear cooperate to achieve a third-stage deceleration. The transmission effect can be adjusted according to the needs of use, so that the power of the output shaft can be adjusted, so that the transmission effect can be fully utilized, thereby increasing the functionality of the device.

[0044] (2) The rotation of the output shaft can be locked by the limit protection mechanism, so that it can remain stable, avoiding the load from continuously reacting on the motor and causing damage to the motor, improving the stability of the output shaft, and making the device have a self-locking effect.

[0045] (3) The power on the connecting shaft is synchronously transmitted to the output shaft through the meshing transmission of the synchronous gear, achieving a secondary deceleration effect, and the connection between the synchronous gear and the connecting shaft and the output shaft can be cut off and controlled to adjust the subsequent transmission effect.

[0046] (4) The power transmission between the mounting shaft and the output shaft is realized by the connection between the transmission head and the transmission groove, and the transmission is automatically released after the transmission head moves forward and disengages from the transmission groove, so that the transmission effect of the subsequent output shaft can be switched.

[0047] (5) The transmission effect in the connecting shaft and the output shaft is controlled synchronously by the movement of the drive seat, and the output power is adjusted. The drive seat is set on the outside of the connecting shaft and is not affected by the rotation of the connecting shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0049] Figure 2 It is a schematic diagram of the top structure of the present invention.

[0050] Figure 3 It is a schematic diagram of the internal structure of the box of the present invention.

[0051] Figure 4 This is a schematic diagram of the three-dimensional structure of the input shaft of the present invention.

[0052] Figure 5 It is a schematic diagram of the three-dimensional structure of the output shaft of the present invention.

[0053] Figure 6 It is a schematic diagram of the three-dimensional structure of the connecting shaft of the present invention.

[0054] Figure 7 This is a schematic diagram of the three-dimensional structure of the locking tooth of the present invention.

[0055] Figure 8 It is a schematic diagram of the three-dimensional structure of the drive seat of the present invention.

[0056] Figure 9 It is a schematic diagram of the side sectional structure of the output shaft of the present invention.

[0057] Figure 10 For the present invention Figure 9 A schematic diagram of the enlarged structure at point a.

[0058] Figure 11 It is a schematic diagram of the side sectional structure of the connecting shaft of the present invention.

[0059] In the figure: 1. housing; 2. input shaft; 3. output shaft; 4. support seat; 5. first gear; 6. second gear; 7. mounting shaft; 8. third gear; 9. fourth gear; 10. connecting shaft; 11. synchronous gear; 12. fifth gear; 13. sixth gear; 14. support plate; 15. locking tooth; 16. locking block; 17. first retractor; 18. first transmission block; 19. transmission head; 20. transmission groove; 21. empty groove; 22. docking block; 23. first spring; 24. docking groove; 25. first trigger block; 26. second spring; 27. second trigger block; 28. third spring; 29. ​​connector; 30. drive seat; 31. connecting groove; 32. second retractor; 33. second transmission block. DETAILED DESCRIPTION

[0060] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0061] Embodiment 1: The present invention provides the following technical solutions: a position-limiting protection type constant tension winch transmission gearbox, such as Figure 1-Figure 5 As shown, it includes a housing 1, an input shaft 2 and an output shaft 3. The input shaft 2 is installed on the rear side of the housing 1, and the output shaft 3 is installed on the front side of the housing 1. The input shaft 2 and the output shaft 3 are both rotationally connected to the housing 1. A first gear 5 is fixed to the front end of the input shaft 2, a second gear 6 is engaged with the right side of the first gear 5, and a mounting shaft 7 is fixed to the middle of the second gear 6, and a third gear 8 is fixed to the front side of the mounting shaft 7, a fourth gear 9 is engaged with the left side of the third gear 8, and a connecting shaft 10 is fixed to the middle of the fourth gear 9, a connecting shaft 10 and the housing 1 are rotationally connected, a transmission mechanism is provided between the connecting shaft 10 and the output shaft 3, and the transmission between the output shaft 3, the connecting shaft 10 and the mounting shaft 7 is controlled by the transmission mechanism.

[0062] When in use, the input shaft 2 is connected to the driving source, and the input shaft 2 is controlled to rotate. The input shaft 2 transmits power to the mounting shaft 7 through the engagement of the first gear 5 and the second gear 6, thereby achieving a first-stage deceleration effect. The mounting shaft 7 can transmit power to the connecting shaft 10 through the engagement of the third gear 8 and the fourth gear 9, thereby achieving a second-stage deceleration effect. The connecting shaft 10 transmits power to the output shaft 3 through the engagement between the fifth gear 12 and the sixth gear 13, thereby achieving a third-stage deceleration effect.

[0063] Example 2: Based on Example 1, Figure 6-Figure 7As shown, it is further disclosed that a support seat 4 is fixed inside the box body 1, and the support seat 4 is arranged between the front end of the input shaft 2 and the input shaft 2 to form a rotational connection, and the support seat 4 and the rear end of the connecting shaft 10 form a rotational connection, and a limit protection mechanism is provided on the outside of the output shaft 3 to lock the rotation of the output shaft 3. The limit protection mechanism includes a locking tooth 15, a locking block 16 and a first retractor 17. The locking tooth 15 is fixed on the outside of the output shaft 3, and the locking block 16 is arranged on the outside of the locking tooth 15 and between the locking tooth 15 to form a locking structure. The first retractor 17 is connected to the locking block 16 to control the horizontal movement of the locking block 16.

[0064] The support seat 4 can improve the installation stability of the input shaft 2 and the connecting shaft 10. After the output shaft 3 stops rotating, the locking block 16 can be controlled to move by the first telescoping device 17, so that the locking block 16 and the locking tooth 15 are connected, and the rotation of the output shaft 3 is limited and locked to keep it stable, thereby protecting the output shaft 3, avoiding accidental rotation of the output shaft 3, and keeping it stable during use.

[0065] Example 3: Based on Example 1, Figures 8-11As shown, the transmission mechanism further discloses that it includes a synchronous gear 11, a fifth gear 12, a sixth gear 13, a support plate 14, a driving mechanism and a switching mechanism. The synchronous gear 11 is arranged on the surface of the connecting shaft 10 and the output shaft 3, and the two sets of synchronous gears 11 are meshed with each other. The synchronous gear 11 and the output shaft 3 and the connecting shaft 10 are all nested. The fifth gear 12 is sleeved on the outside of the connecting shaft 10. The fifth gear 12 is located on the front side of the synchronous gear 11. The sixth gear 13 is sleeved on the outside of the output shaft 3. The sixth gear 13 and the fifth gear 12 are meshed. The support plate 14 is arranged on the outside of the synchronous gear 11, the fifth gear 12 and the sixth gear 13 to provide positioning for them. The driving mechanism is arranged on the connecting shaft 10 and the output shaft 3, the connection between the connecting shaft 10 and the synchronous gear 11, the fifth gear 12, and the output shaft 3 and the synchronous gear 11, the sixth gear 13 is controlled, the switching mechanism is arranged on the front side of the mounting shaft 7, and the horizontal center line of the mounting shaft 7 and the horizontal center line of the output shaft 3 are arranged to coincide with each other, the front and rear sides of the synchronous gear 11, the front and rear sides of the fifth gear 12 and the front and rear sides of the sixth gear 13 are provided with balls, the balls and the support plate 14 fit together, the driving mechanism includes a docking block 22, a first spring 23, a docking groove 24, a first trigger block 25, a second spring 26, a second trigger block 27 and a third spring 28, the docking block 22 is arranged inside the output shaft 3 and the connecting shaft 10, the first spring 23 is arranged on the outside of the docking block 22 The docking block 22 provides an inward thrust, the docking groove 24 is opened at equal angles inside the synchronous gear 11, the fifth gear 12 and the sixth gear 13, and a locking structure is formed between the docking groove 24 and the docking block 22. The first trigger block 25 is arranged on the inner side of the docking block 22, and the surface of the first trigger block 25 is designed with an inclined structure. The second spring 26 is arranged on the outer side of the first trigger block 25 to provide a backward thrust for the first trigger block 25. The second trigger block 27 is arranged on the front side of the first trigger block 25, and the second trigger block 27 is fitted with the docking block 22 on the inner side of the fifth gear 12 and the sixth gear 13. The third spring 28 is arranged on the front side of the second trigger block 27. The switching mechanism includes a first transmission block 18, a transmission head 19, a transmission groove 20, The empty slot 21, the second transmission block 33 and the control mechanism, the first transmission block 18, is arranged at the front end of the mounting shaft 7, and the first transmission block 18 and the mounting shaft 7 form a front-to-back sliding structure, the transmission head 19 is fixed to the front end of the first transmission block 18, the transmission slot 20 is opened at the rear end of the output shaft 3, and a concave-convex matching structure is formed between the transmission slot 20 and the transmission head 19. The empty slot 21 is opened at the front end of the transmission slot 20, and the transmission head 19 enters the empty slot 21 and idles, locking the rear end of the first trigger block 25 located inside the empty slot 21, the second transmission block 33, is arranged inside the connecting shaft 10 and between the connecting shaft 10 to form a front-to-back sliding structure, the control mechanism is arranged on the outside of the first transmission block 18, and synchronously controls the movement of the first transmission block 18 and the second transmission block 33.The control mechanism includes a connector 29, a drive seat 30, a connecting slot 31, and a second retractor 32. The connector 29 is fixed to the surfaces of the first transmission block 18 and the second transmission block 33. The drive seat 30 is sleeved on the outside of the connecting shaft 10 and the output shaft 3. The connecting slot 31 is annular and opened on the rear side of the drive seat 30, and a sliding connection is formed between the connecting slot 31 and the connector 29. The second retractor 32 is fixed to the front side of the drive seat 30 to control the movement of the drive seat 30. The front end of the connector 29 is designed as an enlarged structure, and the connectors 29 are arranged in pairs on the surfaces of the first transmission block 18 and the second transmission block 33.

[0066] When performing the first-stage reduction transmission, the installation shaft 7 drives the transmission head 19 to rotate through the first transmission block 18, and the transmission head 19 drives the output shaft 3 to rotate through the connection with the transmission groove 20, and directly outputs the power. When the second-stage reduction transmission is needed, the driving seat 30 can be controlled to move forward by the second telescopic device 32, so that it drives the first transmission block 18 and the second transmission block 33 to move respectively through the connecting head 29. The first transmission block 18 drives the transmission head 19 to move forward, so that the transmission head 19 is disconnected from the transmission groove 20, and the transmission head 19 enters the empty groove 21 and rotates. At this time, the installation shaft 7 no longer drives the output shaft 3 to rotate, and continues to control the transmission head 19 to move forward. The transmission head 19 will push the first trigger block 25 to move, and the first trigger block 25 will push the docking block 22 to move outward, so that the docking block 22 on the output shaft 3 is connected to the docking groove 24 in the synchronous gear 11, and at the same time, the docking block on the connecting shaft 10 22 is also connected to the docking groove 24 in the synchronous gear 11. The third gear 8 drives the connecting shaft 10 to rotate by meshing with the fourth gear 9. The connecting shaft 10 transmits the power to the output shaft 3 through the synchronous gear 11 to achieve two-stage deceleration. When three-stage deceleration transmission is required, the first transmission block 18 and the second transmission block 33 can continue to be controlled to move forward. The first trigger block 25 releases the squeezing of the docking block 22 in the synchronous gear 11, and the docking block 22 is disengaged from the docking groove 24. Then the first trigger block 25 pushes the second trigger block 27 to move, and the second trigger block 27 pushes the docking block 22 inside the fifth gear 12 and the sixth gear 13 to move, so that it is connected to the docking groove 24. At this time, the power on the connecting shaft 10 is transmitted to the output shaft 3 through the meshing of the fifth gear 12 and the sixth gear 13, achieving a three-stage deceleration effect, so that the device can adjust the deceleration effect according to different usage needs, thereby increasing the functionality of the device.

[0067] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0068] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "dispose," "install," and other conjunctions should be understood broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0069] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A position-limiting protection type constant tension winch transmission gearbox, comprising a box body (1), an input shaft (2) and an output shaft (3), wherein the input shaft (2) is mounted on the rear side of the box body (1), and the output shaft (3) is mounted on the front side of the box body (1); Its characteristics are: The input shaft (2) and the output shaft (3) are both connected to the housing (1) in a rotational manner. A first gear (5) is fixed to the front end of the input shaft (2). A second gear (6) is meshed on the right side of the first gear (5). A mounting shaft (7) is fixed to the middle of the second gear (6). A third gear (8) is fixed to the front side of the mounting shaft (7). A fourth gear (9) is meshed on the left side of the third gear (8). A connecting shaft (10) is fixed to the middle of the fourth gear (9). A connecting shaft (10) is connected to the housing (1) in a rotational manner. A transmission mechanism is provided between the connecting shaft (10) and the output shaft (3). The transmission mechanism controls the transmission between the output shaft (3), the connecting shaft (10) and the mounting shaft (7).

2. The position-limiting protection type constant tension winch transmission gearbox according to claim 1, characterized in that: A support seat (4) is fixed inside the box (1), and the support seat (4) is arranged between the front end of the input shaft (2) and the input shaft (2) to form a rotational connection, and the support seat (4) and the rear end of the connecting shaft (10) form a rotational connection.

3. The position-limiting protection type constant tension winch transmission gearbox according to claim 1, characterized in that: A limit protection mechanism is provided on the outer side of the output shaft (3) to lock the rotation of the output shaft (3).

4. The position-limiting protection type constant tension winch transmission gearbox according to claim 3, characterized in that: The position limiting protection mechanism comprises a locking tooth (15), a locking block (16) and a first retractor (17); A locking tooth (15) fixed to the outside of the output shaft (3); A locking block (16) is arranged on the outer side of the locking tooth (15) and between the locking tooth (15) to form a locking structure; The first telescoping device (17) is connected to the locking block (16) to control the horizontal movement of the locking block (16).

5. The position-limiting protection type constant tension winch transmission gearbox according to claim 1, characterized in that: The transmission mechanism comprises a synchronous gear (11), a fifth gear (12), a sixth gear (13), a support plate (14), a driving mechanism and a switching mechanism; Synchronous gears (11) are arranged on the surfaces of the connecting shaft (10) and the output shaft (3), and the two sets of synchronous gears (11) are meshed with each other, and the synchronous gears (11) and the output shaft (3) and the connecting shaft (10) are all nested and connected; A fifth gear (12) is sleeved on the outer side of the connecting shaft (10), and the fifth gear (12) is located in front of the synchronous gear (11); A sixth gear (13) is sleeved on the outer side of the output shaft (3), and the sixth gear (13) and the fifth gear (12) are meshedly connected; A support plate (14) is arranged on the outside of the synchronous gear (11), the fifth gear (12) and the sixth gear (13) to provide positioning for them; A driving mechanism is provided inside the connecting shaft (10) and the output shaft (3), and controls the connection between the connecting shaft (10) and the synchronous gear (11), the fifth gear (12), and the output shaft (3) and the synchronous gear (11), the sixth gear (13); The switching mechanism is arranged on the front side of the mounting shaft (7), and the horizontal center line of the mounting shaft (7) and the horizontal center line of the output shaft (3) are arranged to coincide with each other.

6. The position-limiting protection type constant tension winch transmission gearbox according to claim 5, characterized in that: Balls are provided on the front and rear sides of the synchronous gear (11), the front and rear sides of the fifth gear (12), and the front and rear sides of the sixth gear (13), and the balls are fitted to the support plate (14).

7. The position-limiting protection type constant tension winch transmission gearbox according to claim 5, characterized in that: The driving mechanism comprises a docking block (22), a first spring (23), a docking groove (24), a first trigger block (25), a second spring (26), a second trigger block (27) and a third spring (28); A docking block (22) is provided inside the output shaft (3) and the connecting shaft (10); A first spring (23) is arranged on the outside of the docking block (22) to provide an inward thrust for the docking block (22); The docking groove (24) is provided at equal angles inside the synchronous gear (11), the fifth gear (12) and the sixth gear (13), and a locking structure is formed between the docking groove (24) and the docking block (22); A first trigger block (25) is arranged on the inner side of the docking block (22), and the surface of the first trigger block (25) is designed to be inclined; a second spring (26), arranged on the outside of the first trigger block (25) to provide a backward thrust for the first trigger block (25); The second trigger block (27) is arranged on the front side of the first trigger block (25), and the second trigger block (27) is in contact with the fifth gear (12) and the docking block (22) on the inner side of the sixth gear (13); The third spring (28) is arranged on the front side of the second trigger block (27).

8. The position-limiting protection type constant tension winch transmission gearbox according to claim 7, characterized in that: The switching mechanism comprises a first transmission block (18), a transmission head (19), a transmission slot (20), an empty slot (21), a second transmission block (33) and a control mechanism; A first transmission block (18) is arranged at the front end of the mounting shaft (7), and a front-to-rear sliding structure is formed between the first transmission block (18) and the mounting shaft (7); A transmission head (19) is fixed to the front end of the first transmission block (18); A transmission groove (20) is provided at the rear end of the output shaft (3), and a concave-convex matching structure is formed between the transmission groove (20) and the transmission head (19); An empty slot (21) is provided at the front end of the transmission slot (20), the transmission head (19) enters the empty slot (21) and idles, and the rear end of the locking first trigger block (25) is located inside the empty slot (21); A second transmission block (33) is arranged inside the connecting shaft (10) and between the connecting shaft (10) to form a forward and backward sliding structure; The control mechanism is arranged outside the first transmission block (18) and synchronously controls the movement of the first transmission block (18) and the second transmission block (33).

9. The position-limiting protection type constant tension winch transmission gearbox according to claim 8, characterized in that: The control mechanism comprises a connecting head (29), a driving seat (30), a connecting groove (31) and a second telescopic device (32); A connector (29) is fixed to the surfaces of the first transmission block (18) and the second transmission block (33); A drive seat (30) is sleeved on the outside of the connecting shaft (10) and the output shaft (3); A connecting groove (31) is formed in an annular shape and is provided on the rear side of the driving seat (30), and a sliding connection is formed between the connecting groove (31) and the connecting head (29); The second telescopic device (32) is fixed to the front side of the driving seat (30) to control the movement of the driving seat (30).

10. The position-limiting protection type constant tension winch transmission gearbox according to claim 9, characterized in that: The front end of the connector (29) is designed to be an enlarged structure, and the connector (29) is arranged in pairs on the surfaces of the first transmission block (18) and the second transmission block (33).

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