A double speed ratio reducer for well sinking winch

Abstract

The present invention relates to the technical field of reduction technology for well-drilling winches, and specifically to a dual-speed ratio reducer for well-drilling winches, wherein both sides of a first driving gear are respectively telescopically plugged into a pair of linkage rings opposite to a first side frame and a second side frame, and a second driving gear is telescopically plugged into a linkage ring on the outer side of the second side frame, and a driving gear group and a driven gear group are laterally staggered, and a pneumatic component for driving the driving gear group to move laterally is arranged on the adjustment frame, and the beneficial effects are as follows: by setting the cooperation of a linkage plug rod and a linkage ring, a telescopic rotation connection of the driving gear group is realized, wherein the driving gear does not contact the input shaft, so that precision wear is not caused during the adjustment process, and at the same time, the rotation of the linkage ring is used to drive the gear meshing transmission, so as to avoid the transmission force being completely applied to the teeth, and the linkage plug rod is used to ensure the direction of the adjustment action during the telescopic adjustment, so that the gears are accurately disengaged or plugged in, and the stability and precision of the adjustment are ensured.

Description

Technical Field

[0001] The invention relates to the technical field of reduction gear for a well-drilling winch, and in particular to a double-speed ratio reducer for a well-drilling winch. Background Art

[0002] The drilling winch is a device used for lifting and hoisting during the excavation process. It meets the needs of slow lifting and transportation of equipment with small loads during drilling. Therefore, its lifting and lowering movement relies on a reducer to adjust the speed.

[0003] Existing patent: CN201120076470.8 A reducer for a well-drilling winch includes an input shaft, which is connected to a double gear through a spline, and the double gear is respectively meshed with two gears on a worm through a fork device, and the worm is meshed with a worm wheel, and the worm wheel is connected to an output shaft. The two gears on the worm are of different sizes. The worm reducer has a self-locking function, there is no danger of overspeeding, the electrical control is simplified, and two speed gears are set, which improves efficiency under light load conditions.

[0004] In the prior art, reducers usually use a double gear set to achieve deceleration. When performing different deceleration adjustments, a fork device is used to achieve adjustment so that the gears can mesh at different positions. This adjustment method is a rigid adjustment, which seriously affects the connection accuracy between the gears and the input shaft. At the same time, the adjustment requires a large force, and due to the meshing between the teeth, the direction of the switching force needs to be precisely controlled during adjustment. It is very easy to cause breakage caused by extrusion and tangency between the teeth during the adjustment process, resulting in inconvenience in adjustment. Summary of the invention

[0005] The object of the present invention is to provide a double-speed ratio reducer for a well-drilling winch to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A double-speed ratio reducer for a well-drilling winch comprises a reducer housing, an input shaft of an external driving device is arranged in the reducer housing, a transmission shaft is arranged in parallel at the lower end of the input shaft, the transmission shaft is connected to the input shaft through a gear set, and the other end of the transmission shaft is transmission-connected to the output shaft.

[0008] The reducer housing is provided with an adjustment frame just above the input shaft, and a pair of first side frames and second side frames distributed in parallel and sleeved on the input shaft are provided at the lower end of the adjustment frame. The gear group includes a driving gear group slidably sleeved on the input shaft and a driven gear group fixedly sleeved on the transmission shaft. The driving gear group includes a first driving gear and a second driving gear, and the driven gear group includes a first driven gear and a second driven gear. One side of the first side frame and both sides of the second side frame are provided with linkage rings rotatably installed through bearings, and the middle of the linkage ring is fixedly sleeved on the input shaft. The two sides of the first driving gear are respectively telescopically inserted in a pair of linkage rings opposite to the first side frame and the second side frame, and the second driving gear is telescopically inserted in the linkage ring outside the second side frame, and the driving gear group and the driven gear group are laterally staggered. A pneumatic component for driving the driving gear group to move laterally is provided on the adjustment frame.

[0009] Preferably, the first driving gear and the first driven gear are meshed to form a first transmission member, the second driving gear and the second driven gear are meshed to form a second transmission member, the transmission ratio of the first transmission member is different from the transmission ratio of the second transmission member, and the first transmission member and the second transmission member are alternately connected.

[0010] Preferably, the ends of the input shaft, transmission shaft and output shaft are rotatably mounted in the reducer housing through bearing seats, a worm wheel is sleeved on the output shaft, a worm is provided at one end of the transmission shaft close to the output shaft, a gear ring is provided on the worm, and the worm wheel is vertically meshed with the gear ring on the worm.

[0011] Preferably, both sides of the first driving gear and one side of the second driving gear are provided with a plurality of groups of linkage rods distributed in a circular array, piston rods are provided at the ends of the linkage rods, the middle of the linkage ring is fixedly sleeved on the outer wall of the input shaft through a spline, and a side wall of the linkage ring close to the driving gear group is provided with slots distributed in a circular array, and a telescopic inner groove penetrating the linkage ring is provided on the inner side of the slot, the linkage rods are slidably inserted in the slots, the piston rods are slidably inserted in the telescopic inner groove, and the pneumatic component adjusts the internal pressure of the telescopic inner groove.

[0012] Preferably, the inner wall of the slot is provided with side grooves distributed in a circular array, the outer wall of the linkage rod is provided with side strips that cooperate with the side grooves, the inner diameter of the slot is larger than the inner diameter of the telescopic inner groove, a retaining ring is fixedly provided on the step surface formed by the slot and the telescopic inner groove, the middle section of the piston rod slides through the retaining ring, and the outer diameter of the piston at the end of the piston rod is larger than the inner diameter of the middle through hole of the retaining ring.

[0013] Preferably, the pneumatic component includes a first inner cavity arranged on the first side frame and a second inner cavity arranged on the second side frame, the first inner cavity and the second inner cavity are both distributed in a ring shape, and a stepped double-layer ring connected to the telescopic inner groove is arranged on the side wall of the linkage ring away from the slot port, the stepped double-layer ring on one side of the linkage ring on the first side frame is rotatably inserted into the first inner cavity, and the linkage rings on both sides of the second side frame are symmetrically rotatably inserted into both sides of the second inner cavity through the stepped double-layer rings.

[0014] Preferably, the pneumatic component includes an air pump, one side of the first inner cavity is sealed by a sealing ring plate, an air passage is arranged at the upper end of the first inner cavity, an air pump is arranged at the upper end of the first side frame, and an output pipe of the air pump is connected to the air passage.

[0015] Preferably, a stepped ring groove is provided on the side wall of the first side frame, the stepped double-layer ring is slidably inserted along the stepped ring groove, and a gasket is rotatably installed on the stepped surface where the stepped ring groove and the stepped double-layer ring are pressed together.

[0016] Preferably, an annular mounting ring groove is provided on the first side frame and the second side frame, the linkage ring is provided with a mounting ring groove, the bearing is sleeved on the outer side of the linkage ring, the bearing comprises an inner ring, an outer ring and a roller, the inner ring is pressed on the side wall of the linkage ring, a limit ring is fixedly installed with screws at the port position of the mounting ring groove, the limit ring is pressed on the side wall of the outer ring, a limit convex tube is extended from the outer port of the slot, and the limit convex tube extends to the outside of the limit ring.

[0017] Preferably, a pressure gauge for monitoring the internal pressure of the second inner cavity is provided on the second side frame.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention realizes the telescopic rotation connection of the active gear set by arranging the cooperation between the linkage plug rod and the linkage ring, wherein the active gear does not contact the input shaft, so that the precision wear will not be caused during the adjustment process, and the rotation of the linkage ring is used to drive the gear meshing transmission, so as to avoid that the transmission force is completely applied to the teeth, and the linkage plug rod is used to ensure the direction of the adjustment during the telescopic adjustment, so that the gears can be accurately disengaged or plugged in, thereby ensuring the stability and precision of the adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of the present invention;

[0021] Figure 2 is a side view of the present invention;

[0022] Figure 3 It is a schematic diagram of the transmission structure of the present invention;

[0023] Figure 4It is a schematic diagram of the structure of the gear set of the present invention installed on the input shaft;

[0024] Figure 5 for Figure 4 A magnified view of the structure at center;

[0025] Figure 6 It is a schematic diagram of the three-dimensional structure of the linkage ring of the present invention;

[0026] Figure 7 It is a schematic diagram of the linkage ring structure of the present invention;

[0027] Figure 8 It is a schematic diagram of the three-dimensional structure of the first driving gear of the present invention;

[0028] Fig. 9 It is a schematic diagram of the three-dimensional structure of the first driving gear and the linkage ring assembly of the present invention.

[0029] In the figure: 1. reducer housing; 2. input shaft; 3. output shaft; 4. transmission shaft; 5. worm; 6. adjustment frame; 7. first driving gear; 8. second driving gear; 9. first driven gear; 10. second driven gear; 11. air pump; 12. gear ring; 13. worm wheel; 14. pressure gauge; 15. first side frame; 16. linkage ring; 17. air duct; 18. linkage plug rod; 19. piston rod; 20. spline; 21. sealing ring plate; 22. first inner cavity; 23. limiting ring; 24. bearing; 25. second side frame; 26. slot; 27. mounting ring groove; 28. output pipe; 29. ​​stepped double-layer ring; 30. stepped ring groove; 31. retaining ring; 32. telescopic inner groove; 33. second inner cavity; 34. limiting convex tube. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0031] See also Figures 1 to 9 , the present invention provides a technical solution:

[0032] A double-speed ratio reducer for a well-drilling winch comprises a reducer housing 1, wherein an input shaft 2 of an external driving device is arranged in the reducer housing 1, a transmission shaft 4 is arranged in parallel at the lower end of the input shaft 2, the transmission shaft 4 is connected to the input shaft 2 through a gear set, the other end of the transmission shaft 4 is transmission-connected to an output shaft 3, the ends of the input shaft 2, the transmission shaft 4 and the output shaft 3 are rotatably mounted in the reducer housing 1 through a bearing seat, a worm wheel 13 is sleeved on the output shaft 3, a worm 5 is arranged at one end of the transmission shaft 4 close to the output shaft 3, a gear ring 12 is arranged on the worm 5, the worm wheel 13 is vertically meshed with the gear ring 12 on the worm 5, a first driving gear 7 is meshed with a first driven gear 9 to form a first transmission member, a second driving gear 8 is meshed with a second driven gear 10 to form a second transmission member, the transmission ratio of the first transmission member is different from the transmission ratio of the second transmission member, and the first transmission member and the second transmission member are alternately connected.

[0033] The rotational power is input through the input shaft 2, and then the rotation of the input shaft 2 drives the driving gear group to rotate, and the meshing of the driving gear group and the driven gear group drives the transmission shaft 4 to decelerate and rotate, and the transmission shaft 4 drives the worm 5 to rotate, and the meshing of the worm 5 and the worm wheel 13 drives the output shaft 3 to further decelerate and rotate, thereby achieving the purpose of decelerated output, wherein different transmission ratios are set to achieve multi-stage adjustment of deceleration.

[0034] The reducer housing 1 is provided with an adjustment frame 6 directly above the input shaft 2. The lower end of the adjustment frame 6 is provided with a pair of first side frames 15 and second side frames 25 which are parallelly distributed and sleeved on the input shaft 2. The gear set includes a driving gear set which is slidably sleeved on the input shaft 2 and a driven gear set which is fixedly sleeved on the transmission shaft 4. The driving gear set includes a first driving gear 7 and a second driving gear 8. The driven gear set includes a first driven gear 9 and a second driven gear 10. One side of the first side frame 15 and both sides of the second side frame 25 are provided with a gear which rotates through a bearing 24. The installed linkage ring 16, the first side frame 15 and the second side frame 25 are both provided with an annular installation ring groove 27, the linkage ring 16 is provided with the installation ring groove 27, the bearing 24 is sleeved on the outer side of the linkage ring 16, the bearing 24 includes an inner ring, an outer ring and a roller, the inner ring is pressed on the side wall of the linkage ring 16, the port position of the installation ring groove 27 is screwed to fix the limit ring 23, the limit ring 23 is pressed on the side wall of the outer ring, the outer port of the slot 26 is extended to provide a limit convex tube 34, and the limit convex tube 34 extends to the outside of the limit ring 23.

[0035] The linkage ring 16 is positioned and installed by setting the mounting ring groove 27, and the linkage ring 16 is rotatably installed by using the bearing 24, so that the linkage ring 16 rotates in the first side frame 15 under the drive of the input shaft 2, and the linkage ring 16 is limited and installed by using the limiting ring 23, and then the outer ring of the bearing 24 is fixed under the squeezing of the limiting ring 23, so that the linkage ring 16 is prevented from falling off.

[0036] The middle of the linkage ring 16 is fixedly sleeved on the input shaft 2, and the two sides of the first driving gear 7 are respectively telescopically inserted into a pair of linkage rings 16 opposite to the first side frame 15 and the second side frame 25. The second driving gear 8 is telescopically inserted into the linkage ring 16 outside the second side frame 25. Both sides of the first driving gear 7 and one side of the second driving gear 8 are provided with a plurality of groups of linkage plug rods 18 distributed in a circumferential array, and the ends of the linkage plug rods 18 are provided with piston rods 19. The middle of the linkage ring 16 is fixedly sleeved on the outer wall of the input shaft 2 through a spline 20, and a circumferential array distribution is provided on the side wall of the linkage ring 16 close to the driving gear group. The slot 26 is provided with a telescopic inner groove 32 which penetrates the linkage ring 16, the inner side of the slot 26 is provided with a telescopic inner groove 32, the linkage rod 18 is slidably inserted in the slot 26, the piston rod 19 is slidably inserted in the telescopic inner groove 32, the inner wall of the slot 26 is provided with side grooves distributed in a circumferential array, the outer wall of the linkage rod 18 is provided with side strips which cooperate with the side grooves, the inner diameter of the slot 26 is larger than the inner diameter of the telescopic inner groove 32, a retaining ring 31 is fixedly provided on the stepped surface formed by the slot 26 and the telescopic inner groove 32, the middle section of the piston rod 19 slides through the retaining ring 31, and the outer diameter of the end piston of the piston rod 19 is larger than the inner diameter of the middle through hole of the retaining ring 31.

[0037] By setting the linkage plug rod 18 to be inserted in the slot 26, the active gear group is inserted and installed on the linkage ring 16, and then the linkage ring 16 is used to drive the active gear group to rotate, and the piston rod 19 is inserted in the telescopic inner groove 32, so as to change the internal pressure of the telescopic inner groove 32, drive the lateral movement of the piston rod 19, and realize position adjustment. The position of the piston rod 19 is limited by the retaining ring 31 to prevent it from falling off.

[0038] The active gear group and the driven gear group are laterally staggered, and a pneumatic assembly for driving the active gear group to move laterally is arranged on the adjustment frame 6. The pneumatic assembly adjusts the internal pressure of the telescopic inner groove 32. The pneumatic assembly includes a first inner cavity 22 arranged on the first side frame 15 and a second inner cavity 33 arranged on the second side frame 25. The first inner cavity 22 and the second inner cavity 33 are both annularly distributed. A stepped double-layer ring 29 connected to the telescopic inner groove 32 is arranged on the side wall of the linkage ring 16 away from the port of the slot 26. The stepped double-layer ring 29 on one side of the linkage ring 16 on the first side frame 15 is rotatably inserted in the first inner cavity 22, and the linkage rings 16 on both sides of the second side frame 25 are symmetrically rotatably inserted on both sides of the second inner cavity 33 through the stepped double-layer ring 29. The pneumatic component includes an air pump 11. One side of the first inner cavity 22 is sealed by a sealing ring plate 21. An air passage 17 is arranged at the upper end of the first inner cavity 22. An air pump 11 is arranged at the upper end of the first side frame 15. The output pipe 28 of the air pump 11 is connected to the air passage 17.

[0039] By setting the cooperation of the air pump 11, the output pipe 28 and the airway 17, the internal pressure of the first inner cavity 22 can be adjusted. When switching is required, the air pump 11 is used to increase the internal pressure of the first inner cavity 22, and the piston rod 19 on the side of the first driving gear 7 close to the first side frame 15 is driven to move outward, and the piston rod 19 on the other side of the first driving gear 7 is simultaneously squeezed toward the second inner cavity 33. During the movement, the connection between the first driving gear 7 and the first driven gear 9 is disconnected. During the movement, the linkage plug rod 18 is used to keep the movement direction parallel to the input shaft 2. As the internal pressure of the second inner cavity 33 increases, the piston rod 19 on one side of the second driving gear 8 is driven to move outward, so that the second driving gear 8 is meshed and connected with the second driven gear 10, thereby realizing multi-stage adjustment of deceleration.

[0040] A stepped annular groove 30 is provided on the side wall of the first side frame 15, and the stepped double-layer ring 29 is slidably inserted along the stepped annular groove 30, and a gasket is rotatably installed on the stepped surface where the stepped annular groove 30 and the stepped double-layer ring 29 are pressed together. A pressure gauge 14 for monitoring the internal pressure of the second inner cavity 33 is provided on the second side frame 25.

[0041] By setting the step ring groove 30 and the step double-layer ring 29 to cooperate, a step surface contact is formed to ensure that when the linkage ring 16 rotates, the step ring groove 30 and the step double-layer ring 29 are sealed. During the adjustment process, by observing the changes in the pressure gauge 14, it is clear whether the reaction gear set is adjusted in place during multi-stage adjustment.

[0042] Working principle: First, the rotational power is input through the input shaft 2, and the driving gear group and the driven gear group are engaged to drive the transmission shaft 4 to decelerate. The worm 5 and the worm wheel 13 are engaged to drive the output shaft 3 to further decelerate and achieve the purpose of decelerated output. By setting different transmission ratios, multi-stage adjustment of deceleration can be achieved.

[0043] In the initial state, the first driving gear 7 is meshed and connected with the first driven gear 9. When the reduction stage needs to be adjusted, the air pump 11 is used to increase the internal pressure of the first inner cavity 22, and the piston rod 19 of the first driving gear 7 close to the first side frame 15 is driven to move outward, and the piston rod 19 on the other side of the first driving gear 7 is simultaneously squeezed toward the second inner cavity 33, so that the internal pressure of the second inner cavity 33 increases. During the movement, the connection between the first driving gear 7 and the first driven gear 9 is disconnected. During the movement, the linkage plug rod 18 is used to keep the movement direction parallel to the input shaft 2. As the internal pressure of the second inner cavity 33 increases, the piston rod 19 on one side of the second driving gear 8 is driven to move outward, so that the second driving gear 8 is meshed and connected with the second driven gear 10, so as to realize multi-stage adjustment of reduction. During the adjustment process, by observing the changes in the pressure gauge 14, it is clear whether the reaction gear group is adjusted in place during multi-stage adjustment.

[0044] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A double-speed ratio reducer for a well-drilling winch, comprising a reducer housing (1), wherein an input shaft (2) of an external drive device is arranged in the reducer housing (1), a transmission shaft (4) is arranged parallel to the lower end of the input shaft (2), the transmission shaft (4) is connected to the input shaft (2) via a gear set, and the other end of the transmission shaft (4) is transmission-connected to an output shaft (3), characterized in that: The reducer housing (1) is provided with an adjustment frame (6) located directly above the input shaft (2); a pair of first side frames (15) and second side frames (25) are provided at the lower end of the adjustment frame (6) and are arranged in parallel and sleeved on the input shaft (2); a gear set comprises a driving gear set slidably sleeved on the input shaft (2) and a driven gear set fixedly sleeved on the transmission shaft (4); the driving gear set comprises a first driving gear (7) and a second driving gear (8); the driven gear set comprises a first driven gear (9) and a second driven gear (10); one side of the first side frame (15) and the second side frame (25) are provided. Both sides of the two side frames (25) are provided with linkage rings (16) rotatably mounted via bearings (24); the middle of the linkage rings (16) is fixedly sleeved on the input shaft (2); both sides of the first driving gear (7) are telescopically plugged into a pair of linkage rings (16) opposite to each other on the first side frame (15) and the second side frame (25); the second driving gear (8) is telescopically plugged into the linkage ring (16) on the outer side of the second side frame (25); and the driving gear group and the driven gear group are laterally staggered; and a pneumatic component for driving the driving gear group to move laterally is provided on the adjustment frame (6).

2. A double speed ratio reducer for a well sinking winch according to claim 1, characterized in that: The first driving gear (7) and the first driven gear (9) are meshed to form a first transmission member, and the second driving gear (8) and the second driven gear (10) are meshed to form a second transmission member. The transmission ratio of the first transmission member is different from the transmission ratio of the second transmission member, and the first transmission member and the second transmission member are alternately connected.

3. A double speed ratio reducer for a well sinking winch according to claim 2, characterized in that: The ends of the input shaft (2), the transmission shaft (4) and the output shaft (3) are rotatably mounted in the reducer housing (1) via a bearing seat; a worm wheel (13) is sleeved on the output shaft (3); a worm (5) is arranged at one end of the transmission shaft (4) close to the output shaft (3); a gear ring (12) is arranged on the worm (5); and the worm wheel (13) is meshed with the gear ring (12) on the worm (5) in a vertically meshing manner.

4. A double speed ratio reducer for a well sinking winch according to claim 1, characterized in that: Both sides of the first driving gear (7) and one side of the second driving gear (8) are provided with a plurality of groups of linkage rods (18) distributed in a circumferential array, and piston rods (19) are provided at the ends of the linkage rods (18). The middle of the linkage ring (16) is fixedly sleeved on the outer wall of the input shaft (2) via a spline (20), and a side wall of the linkage ring (16) close to the driving gear group is provided with slots (26) distributed in a circumferential array, and a telescopic inner groove (32) penetrating the linkage ring (16) is provided on the inner side of the slot (26), and the linkage rods (18) are slidably inserted in the slots (26), and the piston rods (19) are slidably inserted in the telescopic inner groove (32), and the pneumatic component adjusts the internal pressure of the telescopic inner groove (32).

5. A double speed ratio reducer for a well sinking winch according to claim 4, characterized in that: The inner wall of the slot (26) is provided with side grooves distributed in a circumferential array, the outer wall of the linkage plug rod (18) is provided with side strips that are plugged into the side grooves, the inner diameter of the slot (26) is larger than the inner diameter of the telescopic inner groove (32), a retaining ring (31) is fixedly provided on the stepped surface formed by the slot (26) and the telescopic inner groove (32), the middle section of the piston rod (19) slides through the retaining ring (31), and the outer diameter of the piston at the end of the piston rod (19) is larger than the inner diameter of the middle through hole of the retaining ring (31).

6. A double speed ratio reducer for a well sinking winch according to claim 5, characterized in that: The pneumatic assembly comprises a first inner cavity (22) arranged on a first side frame (15) and a second inner cavity (33) arranged on a second side frame (25); the first inner cavity (22) and the second inner cavity (33) are both distributed in an annular shape; a stepped double-layer ring (29) communicating with the telescopic inner groove (32) is arranged on a side wall of the linkage ring (16) away from a port of the slot (26); the stepped double-layer ring (29) on one side of the linkage ring (16) on the first side frame (15) is rotatably inserted into the first inner cavity (22); and the linkage rings (16) on both sides of the second side frame (25) are symmetrically rotatably inserted into both sides of the second inner cavity (33) via the stepped double-layer ring (29).

7. A double speed ratio reducer for a well sinking winch according to claim 6, characterized in that: The pneumatic assembly comprises an air pump (11), one side of the first inner cavity (22) is sealed by a sealing ring plate (21), an air passage (17) is arranged at the upper end of the first inner cavity (22), an air pump (11) is arranged at the upper end of the first side frame (15), and an output pipe (28) of the air pump (11) is connected to the air passage (17).

8. A double speed ratio reducer for a well sinking winch according to claim 7, characterized in that: A stepped ring groove (30) is provided on the side wall of the first side frame (15), the stepped double-layer ring (29) is slidably inserted along the stepped ring groove (30), and a gasket is rotatably mounted on the stepped surface where the stepped ring groove (30) and the stepped double-layer ring (29) are pressed together.

9. A double speed ratio reducer for a well sinking winch according to claim 3, characterized in that: An annular mounting groove (27) is provided on the first side frame (15) and the second side frame (25); the linkage ring (16) is arranged in the mounting groove (27); the bearing (24) is sleeved on the outer side of the linkage ring (16); the bearing (24) comprises an inner ring, an outer ring and a roller; the inner ring is pressed onto the side wall of the linkage ring (16); a limit ring (23) is fixedly installed at the port position of the mounting groove (27) by screws; the limit ring (23) is pressed onto the side wall of the outer ring; a limit convex tube (34) is extended from the outer port of the slot (26); the limit convex tube (34) extends to the outer side of the limit ring (23).

10. The double-speed ratio reducer for a well-drilling winch according to claim 1, characterized in that: The second side frame (25) is provided with a pressure gauge (14) for monitoring the internal pressure of the second inner cavity (33).

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