Underwater winch drum structure

Abstract

The invention discloses an underwater winch drum structure which is characterized in that a main shaft assembly is sleeved with a left side sealing flange at a four-point contact bearing, the main shaft assembly is sleeved with a right side sealing flange at a self-aligning roller bearing, the outer end of the left side sealing flange is provided with a left side bearing cover, and the outer end of the right side sealing flange is provided with a right side bearing cover; the mechanical sealing assemblies are arranged at the two ends of the main shaft assembly respectively, the winding drum is arranged between the left side sealing flange and the right side sealing flange, and the servo motor, the planetary speed reducer and the planetary speed reducer fixing frame are installed in the winding drum through the oil sealing frame. Meanwhile, the mechanical sealing assemblies are arranged between the main shaft assembly and the left side bearing cover and between the main shaft assembly and the right side bearing cover, the waterproof performance of the two ends of the winding drum is guaranteed through the mechanical sealing assemblies, and therefore the depth of underwater operation is greatly increased.

Description

Technical Field

[0001] The present invention relates to the technical field of winch drums, and specifically to an underwater winch drum structure. Background Art

[0002] A winch, also known as a hoist, is a light and small lifting device that winds a steel wire rope or chain around a drum to lift or tow heavy objects. The winch can vertically lift, horizontally or obliquely tow heavy objects.

[0003] Since the underwater winch operates underwater, generally, the motor of the underwater winch is installed inside the drum. The motor inside the existing underwater winch drum is generally installed on the axis of the drum, which greatly reduces the overall supportability and stability. Moreover, for the existing underwater winch drum structure, only rubber rings are used for sealing the support shafts at both ends. After reaching a certain pressure, the sealing rings between the sealing plate and the main shaft are prone to deformation, resulting in water leakage, which limits the maximum depth of underwater operation. Therefore, an improved technology is urgently needed to solve this problem existing in the prior art. Summary of the Invention

[0004] The purpose of the present invention is to provide an underwater winch drum structure. The planetary reducer fixing frame is installed inside the drum through an oil seal frame, and the servo motor is connected to the planetary reducer fixing frame through the planetary reducer and is reasonably installed inside the drum without affecting the installation of the main shaft assembly, making the structure more compact and stable. At the same time, mechanical seal assemblies are provided between the main shaft assembly and the left bearing cover and the right bearing cover respectively. The waterproof performance at both ends of the drum is ensured through the mechanical seal assemblies, thereby greatly increasing the depth of underwater operation, so as to solve the problems raised in the above background art.

[0005] To achieve the above object, the present invention provides the following technical solution: An underwater winch drum structure, comprising a main shaft assembly, a four-point contact bearing, a spherical roller bearing, a left sealing flange, a right sealing flange, a left bearing cover, a right bearing cover, a mechanical seal assembly, a sleeve, a drum, an oil seal bracket, a planetary reducer fixing bracket, a planetary reducer, a servo motor, a driving sprocket, a driving gear and an internal gear. Four-point contact bearings and spherical roller bearings are sleeved at both ends of the main shaft assembly. A left sealing flange is sleeved at the position of the four-point contact bearing of the main shaft assembly. A right sealing flange is sleeved at the position of the spherical roller bearing of the main shaft assembly. A left bearing cover is arranged at the outer end of the left sealing flange, and the left bearing cover presses on the four-point contact bearing. A right bearing cover is arranged at the outer end of the right sealing flange, and the right bearing cover presses on the spherical roller bearing. Mechanical seal assemblies are respectively arranged at both ends of the main shaft assembly. The mechanical seal assemblies at both ends of the main shaft assembly are tightly connected to the left bearing cover and the right bearing cover respectively. A sleeve is sleeved at the outer end of the mechanical seal assembly at one end of the left sealing flange. A driving sprocket is arranged outside the sleeve. A drum is arranged between the left sealing flange and the right sealing flange. The drum is coaxially arranged with the main shaft assembly. An oil seal bracket is arranged at one end of the main shaft assembly close to the right sealing flange. The oil seal bracket is provided with an installation groove. A planetary reducer fixing bracket is arranged at the installation groove of the oil seal bracket. The planetary reducer fixing bracket is connected to the planetary reducer. The input end of the planetary reducer is connected to the servo motor. Both the servo motor and the planetary reducer are located inside the drum. A driving gear is arranged on the output shaft of the planetary reducer. An internal gear is connected to the inner side of the right sealing flange. The internal gear meshes with the driving gear. A terminal block is also installed on the part of the main shaft assembly located inside the drum;

[0006] The mechanical seal assembly includes a first cylinder body, a second cylinder body, a first sealing ring, a second sealing ring, a pressing cylinder, a third sealing ring, a fourth sealing ring, an inner pressing ring, a first spring and a second spring. The first cylinder body and the second cylinder body are connected in a matching manner. The inner part of the first cylinder body is matched with the outer end of the first sealing ring. The pressing cylinder is sleeved on the main shaft assembly. An inner pressing ring is sleeved at one end of the pressing cylinder and is fixedly connected by bolts. The inner pressing ring is matched with the second sealing ring. A first spring is arranged between the second sealing ring and the inner pressing ring. The second sealing ring is connected to the first sealing ring. The third sealing ring and the fourth sealing ring are both sleeved on the pressing cylinder. A limiting plate is arranged at the end of the pressing cylinder away from the first sealing ring. One end of the third sealing ring supports on the limiting plate. The other end of the third sealing ring is connected to the fourth sealing ring. The fourth sealing ring is movably matched with the second cylinder body. A second spring is also sleeved between the fourth sealing ring and the second cylinder body. Sealing rings are arranged between the first sealing ring and the first cylinder body, between the second sealing ring and the pressing cylinder, between the third sealing ring and the limiting plate, between the fourth sealing ring and the second cylinder body, and between the pressing cylinder and the main shaft assembly.

[0007] Preferably, for an underwater winch drum structure provided by the present invention, a first rotary lip seal is arranged inside the four-point contact bearing, and the first rotary lip seal is sleeved on the main shaft assembly.

[0008] Preferably, for an underwater winch drum structure provided by the present invention, a plurality of first O-rings are arranged between the left bearing cover and the left sealing flange.

[0009] Preferably, for an underwater winch drum structure provided by the present invention, a plurality of second O-rings are arranged between the right bearing cover and the right sealing flange.

[0010] Preferably, for an underwater winch drum structure provided by the present invention, a plurality of third O-rings are arranged between the right sealing flange and the internal gear.

[0011] Preferably, for an underwater winch drum structure provided by the present invention, a wire hole is axially formed in the main shaft assembly, and a watertight joint assembly is arranged at both ends of the main shaft assembly and at the wire hole.

[0012] Preferably, for an underwater winch drum structure provided by the present invention, a second rotary lip seal is arranged between the oil seal bracket and the internal gear.

[0013] Preferably, for an underwater winch drum structure provided by the present invention, a gear pressing plate is arranged at the outer end of the output shaft of the planetary speed reducer, and the gear pressing plate presses on the outer end of the driving gear.

[0014] Preferably, for an underwater winch drum structure provided by the present invention, the mating part between the driving gear and the oil seal bracket is a smooth surface, and a third rotary lip seal is also arranged at the mating part between the driving gear and the oil seal bracket.

[0015] Preferably, for an underwater winch drum structure provided by the present invention, both ends of the main shaft assembly are connected with the fixed shaft seats in a mating manner.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] The planetary speed reducer fixing bracket is installed inside the drum through the oil seal bracket, and the servo motor is connected to the planetary speed reducer fixing bracket through the planetary speed reducer. It is reasonably installed inside the drum without affecting the installation of the main shaft assembly, and the structure is more compact and has better stability. At the same time, mechanical seal assemblies are arranged between the main shaft assembly and the left bearing cover and the right bearing cover respectively. The waterproof performance at both ends of the drum is ensured through the mechanical seal assemblies, thereby greatly increasing the depth of underwater operation. Description of the Drawings

[0018] Figure 1Schematic cross-sectional structure diagram of the present invention;

[0019] Figure 2 Enlarged structure diagram of the present invention at the left sealing flange;

[0020] Figure 3 Enlarged structure diagram of the present invention at the right sealing flange;

[0021] Figure 4 Schematic appearance structure diagram of the present invention;

[0022] Figure 5 Schematic side view structure diagram of the present invention;

[0023] Figure 6 Schematic structure diagram of the mechanical seal assembly.

[0024] In the figure: main shaft assembly 1, four-point contact bearing 2, spherical roller bearing 3, left sealing flange 4, right sealing flange 5, left bearing cover 6, right bearing cover 7, mechanical seal assembly 8, sleeve 9, drum 10, oil seal holder 11, planetary reducer fixing bracket 12, planetary reducer 13, servo motor 14, driving sprocket 15, driving gear 16, internal gear 17, terminal block 18, first rotary lip seal 19, first O-ring 20, second O-ring 21, third O-ring 22, watertight joint assembly 23, second rotary lip seal 24, gear pressing plate 25, third rotary lip seal 26, fixed shaft seat 27, first cylinder 801, second cylinder 802, first sealing ring 803, second sealing ring 804, pressure cylinder 805, third sealing ring 806, fourth sealing ring 807, internal pressure ring 808, first spring 809, second spring 810, limit plate 811, sealing ring 812. Specific embodiments

[0025] Next, the technical solutions 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 of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention;

[0026] It should be noted that in the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "inner", "outer", "upper", "lower", "both sides", "one end", "the other end", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0027] Please refer to Figures 1-5, the present invention provides a technical solution: an underwater winch drum structure, including a main shaft assembly 1, a four-point contact bearing 2, a spherical roller bearing 3, a left sealing flange 4, a right sealing flange 5, a left bearing cover 6, a right bearing cover 7, a mechanical seal assembly 8, a sleeve 9, a drum 10, an oil seal holder 11, a planetary reducer fixing bracket 12, a planetary reducer 13, a servo motor 14, a driving sprocket 15, a driving gear 16 and an internal gear 17. Four-point contact bearings 2 and spherical roller bearings 3 are sleeved at both ends of the main shaft assembly 1. A left sealing flange 4 is sleeved at the position of the main shaft assembly 1 where the four-point contact bearing 2 is located. A first rotary lip seal 19 is arranged inside the four-point contact bearing 2. The first rotary lip seal 19 is sleeved on the main shaft assembly 1. By setting the first rotary lip seal 19, the sealing performance of the connection between the left sealing flange 4 and the main shaft assembly 1 is ensured. A right sealing flange 5 is sleeved at the position of the main shaft assembly 1 where the spherical roller bearing 3 is located. A left bearing cover 6 is arranged at the outer end of the left sealing flange 4. A plurality of first O-rings 20 are arranged between the left bearing cover 6 and the left sealing flange 4. By means of the first O-rings 20, the sealing performance between the left bearing cover 6 and the left sealing flange 4 is ensured. The left bearing cover 6 presses on the four-point contact bearing 2. A right bearing cover 7 is arranged at the outer end of the right sealing flange 5. A plurality of second O-rings 21 are arranged between the right bearing cover 7 and the right sealing flange 5. By means of the second O-rings 21, the sealing performance between the right bearing cover 7 and the right sealing flange 5 is ensured. The right bearing cover 7 presses on the spherical roller bearing 3. Mechanical seal assemblies 8 are respectively arranged at both ends of the main shaft assembly 1. The mechanical seal assemblies 8 at both ends of the main shaft assembly 1 are tightly connected to the left bearing cover 6 and the right bearing cover 7 respectively. A sleeve 9 is sleeved at the outer end of the mechanical seal assembly 8 at one end of the left sealing flange 4. A driving sprocket 15 is arranged outside the sleeve 9. A drum 10 is arranged between the left sealing flange 4 and the right sealing flange 5. The drum 10 is coaxially arranged with the main shaft assembly 1. An oil seal holder 11 is arranged at one end of the main shaft assembly 1 close to the right sealing flange 5. The oil seal holder 11 is provided with an installation groove. A planetary reducer fixing bracket 12 is arranged at the installation groove of the oil seal holder 11. The planetary reducer fixing bracket 12 is connected to the planetary reducer 13. The input end of the planetary reducer 13 is connected to the servo motor 14. Both the servo motor 14 and the planetary reducer 13 are located inside the drum 10. A driving gear 16 is arranged on the output shaft of the planetary reducer 13. A gear pressing plate 25 is arranged at the outer end of the output shaft of the planetary reducer 13. The gear pressing plate 25 presses on the outer end of the driving gear 16. By means of the gear pressing plate 25, the connection between the driving gear 16 and the output shaft of the planetary reducer 13 is realized. The mating surface between the driving gear 16 and the oil seal holder 11 is a smooth surface. A third rotary lip seal 26 is also arranged at the mating position between the driving gear 16 and the oil seal holder 11. By means of the third rotary lip seal 26, it is ensured that water does not enter the inner cavity of the drum 10 from the driving gear 16. The inner side of the right sealing flange 5 is connected with an internal gear 17,A second rotary lip seal ring 24 is provided between the oil seal holder 11 and the internal gear 17 to ensure the sealing performance between the oil seal holder 11 and the internal gear 17. A number of third O-ring seals 22 are provided between the right sealing flange 5 and the internal gear 17 to ensure the sealing performance between the right sealing flange 5 and the internal gear 17. The internal gear 17 meshes with the driving gear 16. A terminal block 18 is also installed on the part of the main shaft assembly 1 located inside the drum 10. The main shaft assembly 1 is axially provided with a wire hole to realize the wiring of the terminal block 18. Watertight connector assemblies 23 are provided at both ends of the main shaft assembly 1 at the wire hole to realize the sealed wiring with the external connecting wires. Both ends of the main shaft assembly 1 are connected to the fixed shaft seat 27 in a mating manner to realize the overall support;

[0028] Such as Figure 6As shown in the figure, the mechanical seal assembly 8 includes a first cylinder body 801, a second cylinder body 802, a first sealing ring 803, a second sealing ring 804, a pressing cylinder 805, a third sealing ring 806, a fourth sealing ring 807, an inner pressure ring 808, a first spring 809 and a second spring 810. The first cylinder body 801 and the second cylinder body 802 are cooperatively connected. The inside of the first cylinder body 801 is in cooperation with the outer end of the first sealing ring 803. The pressing cylinder 805 is sleeved on the main shaft assembly 1. An inner pressure ring 808 is sleeved at one end of the pressing cylinder 805 and is fixedly connected by bolts. The inner pressure ring 808 is in cooperation with the second sealing ring 804. A first spring 809 is arranged between the second sealing ring 804 and the inner pressure ring 808. The second sealing ring 804 is connected to the first sealing ring 803. The third sealing ring 806 and the fourth sealing ring 807 are both sleeved on the pressing cylinder 805. A limiting plate 811 is arranged at one end of the pressing cylinder 805 away from the first sealing ring 803. One end of the third sealing ring 806 is supported on the limiting plate 811. The other end of the third sealing ring 806 is connected to the fourth sealing ring 807. The fourth sealing ring 807 is in movable cooperation with the second cylinder body 802. A second spring 810 is also sleeved between the fourth sealing ring 807 and the second cylinder body 802. Sealing rings 812 are arranged between the first sealing ring 803 and the first cylinder body 801, between the second sealing ring 804 and the pressing cylinder 805, between the third sealing ring 806 and the limiting plate 811, between the fourth sealing ring 807 and the second cylinder body 802, and between the pressing cylinder 805 and the main shaft assembly 1. The installation method of the mechanical seal assembly 8 is as follows: First, place the first sealing ring 803 into the first cylinder body 801. Then, sleeve the third sealing ring 806 and the fourth sealing ring 807 outside the pressing cylinder 805 and make the third sealing ring 806 abut against the limiting plate 811. Subsequently, sleeve the second cylinder body 802 outside the pressing cylinder 805. The fourth sealing ring 807 is in cooperation with the second cylinder body 802 through the second spring 810. Then, sleeve the inner pressure ring 808 on the pressing cylinder 805 and fasten it with bolts. Subsequently, sleeve the second sealing ring 204 outside the pressing cylinder 805 and make it cooperate with the inner pressure ring 808 through the first spring 809. Finally, sleeve the first cylinder body 801 with the first sealing ring 803 inside on the main shaft assembly 1, and then sleeve the pressing cylinder 805 on the main shaft assembly 1 and fasten it to the main shaft assembly 1 with bolts. At this time, the second cylinder body 802 is just cooperatively connected to the first cylinder body 801, and the installation of the mechanical seal assembly 8 is completed. During the installation process, the sealing rings 812 also need to be installed in the corresponding positions.

[0029] Installation method and operating principle: First, install the oil seal holder 11 on the main shaft assembly 1. Subsequently, install the planetary reducer fixing bracket 12 at the installation groove of the oil seal holder 11. Then, connect the planetary reducer 13 connected to the servo motor 14 to the planetary reducer fixing bracket 12. Install the driving gear 16 on the output shaft of the planetary reducer 13 and fix it with the gear pressing plate 25. Slip the drum 10 over the outside of the main shaft assembly 1, connect the left sealing flange 4 and the right sealing flange 5 to both ends of the drum 10 respectively. Then, fit the four-point contact bearing 2 with the left sealing flange 4, and fit the spherical roller bearing 3 with the right sealing flange 5. Next, press the left bearing cover 6 on the outside of the left sealing flange 4 and the four-point contact bearing 2, and press the right bearing cover 7 on the outside of the right sealing flange 5 and the spherical roller bearing 3. Finally, slip the mechanical seal assembly 8 over both ends of the main shaft assembly 1 and fit the sleeve 9 with the mechanical seal assembly 8 to complete the assembly. During use, start the servo motor 14. The servo motor 14 drives the driving gear 16 to rotate through the output shaft of the planetary reducer 13. The driving gear 16 then drives the internal gear 17 to rotate, and the internal gear 17 drives the right sealing flange 5 to rotate, thereby realizing the rotation of the drum 10. The connecting wire of the servo motor 14 is connected to the terminal block 18, and the terminal block 18 is then connected to the external connecting wire through the watertight joint assembly 23. The structure of the present invention is reasonable. The planetary reducer fixing bracket 12 is installed inside the drum 10 through the oil seal holder 11. The servo motor 14 is connected to the planetary reducer fixing bracket 12 through the planetary reducer 13 and is reasonably installed inside the drum 10 without affecting the installation of the main shaft assembly 1. The structure is more compact and has better stability. At the same time, mechanical seal assemblies 8 are provided between the main shaft assembly 1 and the left bearing cover 6 and the right bearing cover 7 respectively. The waterproof performance at both ends of the drum is ensured through the mechanical seal assemblies 8, thereby greatly increasing the depth of underwater operation.

[0030] Details not described in the present invention are all well-known technologies to those skilled in the art.

[0031] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and are not intended to be limiting. Although the present invention has been described in detail with reference to the embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified and equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. An underwater winch drum structure, characterized in that: The invention comprises a main shaft assembly (1), a four-point contact bearing (2), a spherical roller bearing (3), a left sealing flange (4), a right sealing flange (5), a left bearing cover (6), a right bearing cover (7), a mechanical seal assembly (8), a sleeve (9), a reel (10), an oil seal frame (11), a planetary reducer fixing frame (12), a planetary reducer (13), a servo motor (14), a driving sprocket (15), a driving gear (16) and an internal gear (17). The main shaft assembly (1) is provided with four-point contact bearings (2) and spherical roller bearings (3) at both ends. The main shaft assembly (1) is located at the four A left sealing flange (4) is sleeved at the point contact bearing (2); a right sealing flange (5) is sleeved at the spherical roller bearing (3) of the main shaft assembly (1); a left bearing cover (6) is arranged at the outer end of the left sealing flange (4); the left bearing cover (6) is pressed on the four-point contact bearing (2); a right bearing cover (7) is arranged at the outer end of the right sealing flange (5); the right bearing cover (7) is pressed on the spherical roller bearing (3); mechanical seal assemblies (8) are respectively arranged at both ends of the main shaft assembly (1); the mechanical seal assemblies (8) at both ends of the main shaft assembly (1) are respectively arranged The mechanical seal assembly (8) is tightly connected to the left bearing cover (6) and the right bearing cover (7), respectively; a sleeve (9) is sleeved on the outer end of the mechanical seal assembly (8) located at one end of the left sealing flange (4); a driving sprocket (15) is arranged outside the sleeve (9); a reel (10) is arranged between the left sealing flange (4) and the right sealing flange (5); the reel (10) is coaxially arranged with the main shaft assembly (1); an oil seal frame (11) is arranged at one end of the main shaft assembly (1) close to the right sealing flange (5); the oil seal frame (11) is provided with a mounting groove; and a row of a planetary reducer fixing frame (12), the planetary reducer fixing frame (12) being connected to a planetary reducer (13), the input end of the planetary reducer (13) being connected to a servo motor (14), the servo motor (14) and the planetary reducer (13) being both located in the reel (10), the output shaft of the planetary reducer (13) being provided with a driving gear (16), the inner side of the right sealing flange (5) being connected with an internal gear (17), the internal gear (17) being meshed with the driving gear (16), and the main shaft assembly (1) being located in the inner part of the reel (10) being also provided with a wiring terminal block (18); The mechanical seal assembly (8) comprises a first cylinder (801), a second cylinder (802), a first sealing ring (803), a second sealing ring (804), a pressure cylinder (805), a third sealing ring (806), a fourth sealing ring (807), an inner pressure ring (808), a first spring (809) and a second spring (810). The first cylinder (801) and the second cylinder (802) are connected in a cooperative manner. The interior of the first cylinder (801) cooperates with the outer end of the first sealing ring (803). The pressure cylinder (805) is sleeved on the main shaft assembly (1). One end of the pressure cylinder (805) is sleeved with an inner pressure ring (808) and is fastened by bolts. The inner pressure ring (808) cooperates with the second sealing ring (804). A first spring (809) is arranged between the second sealing ring (804) and the inner pressure ring (808). The second sealing ring (804) is connected to the first sealing ring (803). The third sealing ring (806) and the fourth sealing ring (807) are both sleeved on the pressing cylinder (805). A limiting plate (811) is provided at one end of the pressing cylinder (805) away from the first sealing ring (803). One end of the third sealing ring (806) is supported on the limiting plate (811). The other end of the third sealing ring (806) is connected to the fourth sealing ring (807). The fourth sealing ring (807) is movably matched with the second cylinder (802). A second spring (810) is also provided between the sealing ring (807) and the second cylinder (802), and sealing rings (812) are provided between the first sealing ring (803) and the first cylinder (801), between the second sealing ring (804) and the pressure cylinder (805), between the third sealing ring (806) and the limit plate (811), between the fourth sealing ring (807) and the second cylinder (802), and between the pressure cylinder (805) and the main shaft assembly (1).

2. The underwater winch drum structure according to claim 1, characterized in that: A first rotating lip seal ring (19) is arranged on the inner side of the four-point contact bearing (2), and the first rotating lip seal ring (19) is sleeved on the main shaft assembly (1).

3. The underwater winch drum structure according to claim 1, characterized in that: A plurality of first O-rings (20) are arranged between the left bearing cover (6) and the left sealing flange (4).

4. The underwater winch drum structure according to claim 1, characterized in that: A plurality of second O-rings (21) are arranged between the right bearing cover (7) and the right sealing flange (5).

5. The underwater winch drum structure according to claim 1, characterized in that: A plurality of third O-rings (22) are arranged between the right sealing flange (5) and the internal gear (17).

6. The underwater winch drum structure according to claim 1, characterized in that: The main shaft assembly (1) is provided with a wire hole along the axial direction, and watertight joint assemblies (23) are provided at both ends of the main shaft assembly (1) and located at the wire hole.

7. The underwater winch drum structure according to claim 1, characterized in that: A second rotating lip seal ring (24) is provided between the oil seal frame (11) and the internal gear (17).

8. The underwater winch drum structure according to claim 1, characterized in that: A gear pressing plate (25) is provided at the outer end of the output shaft of the planetary reducer (13), and the gear pressing plate (25) is pressed on the outer end of the driving gear (16).

9. The underwater winch drum structure according to claim 1, characterized in that: The mating portion between the driving gear (16) and the oil seal frame (11) is a smooth surface, and the mating portion between the driving gear (16) and the oil seal frame (11) is also provided with a third rotating lip seal ring (26).

10. The underwater winch drum structure according to claim 1, characterized in that: Both ends of the main shaft assembly (1) are cooperatively connected with the fixed shaft seat (27).

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