High-precision gapless worm and gear speed reducer

Abstract

The high-precision gapless worm and gear speed reducer comprises a main shell, an auxiliary shell is arranged at the top of the main shell, mounting grooves are formed in the two sides of the top of the main shell, movable cavities are formed in the two sides of the bottom of the main shell, and limiting blocks are fixedly connected to the two sides of an inner cavity of each movable cavity. The speed reducer shell comprises a main shell body and an auxiliary shell body, the main shell body is provided with two limiting blocks, the surfaces of the two limiting blocks are provided with a movable plate in a sliding mode, the top of the movable plate is fixedly connected with four plug pins, and the interior of the installation groove is connected with an installation strip in an inserted mode. The modularized structural design of the speed reducer shell is adopted, the whole shell body is divided into the main shell body and the auxiliary shell body on the basis that the size of the speed reducer shell body is not changed; after all the components are arranged and installed in the main shell, the auxiliary shell is installed on the main shell, so that the step of adjusting the angle positions of the components is omitted, many limitations are avoided, the assembly speed of the speed reducer is increased, and the installation efficiency is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to worm gear speed reducer technical field, especially a high precision gapless worm gear speed reducer. BACKGROUND

[0002] Speed reducer has various number classification, and the worm gear speed reducer is one of speed reducers, and the traditional worm gear speed reducer shell is integrally formed as a whole, is installed by putting components into the port on the shell, but the internal space of high-precision worm gear speed reducer is small, and the components are limited in the process of being put in, and it is more difficult to adjust the position and angle of the components in the shell, especially the meshing adjustment of the worm gear is greatly hindered, which greatly affects the assembly work of the speed reducer, slows down the assembly speed of the speed reducer and reduces the assembly efficiency of the speed reducer.

[0003] In view of the above problems, the utility model improves. SUMMARY

[0004] The utility model discloses a high precision gapless worm gear speed reducer, solves the above -mentioned problem in the use process in the prior art.

[0005] The utility model discloses a high precision gapless worm gear speed reducer, solves the above -mentioned problem in the use process in the prior art.

[0006] The utility model discloses a high precision gapless worm gear speed reducer for further being used, further: one end of press plate is equipped with recess, the recess inside swing installation has the connecting strip, and the connecting strip is away from the recess one end swing installation in the movable plate.

[0007] The utility model discloses a high precision gapless worm gear speed reducer for further being used, further: the both sides of movable plate are equipped with the limit sliding slot of being matched with the limit block, and one side of movable plate top is equipped with the opening of being matched with the connecting strip.

[0008] The utility model discloses a high-precision gapless worm and gear speed reducer for above-mentioned, further: one side of pressing plate is provided with pivot, and pressing plate is installed in the cavity of movable cavity through pivot.

[0009] The utility model discloses a high-precision gapless worm and gear speed reducer for above-mentioned, further: the top of main casing and the bottom of vice casing all are provided with sealing washer installation slot, and the inner chamber of two sealing washer installation slots is embedded with sealing washer.

[0010] The utility model discloses a high-precision gapless worm and gear speed reducer for above-mentioned, further: the main casing and vice casing are embedded with drive shaft no.

[0011] The utility model discloses a high-precision gapless worm and gear speed reducer for above-mentioned, further: the main casing and vice casing are embedded with drive shaft no.

[0012] Summarized above, the beneficial effects of the utility model lie in:

[0013] 1, the utility model discloses the structural design of modularization's see speed reducer casing, on the basis of not changing the size of speed reducer casing, the whole casing is divided into main, vice two casings, after all components are all laid out and install into main casing, then, vice casing is installed to main casing, thereby, the step of adjusting component angle position is saved, so many restrictions will not appear, speed up the assembly speed of speed reducer, improve installation efficiency.

[0014] 2, the utility model discloses the setting of connecting strip and recess, and the both ends of connecting strip are respectively installed in pressing plate and movable plate, so when pressing plate is in the activity work of pulling movable plate, connecting strip can make the relative adaptation with pressing plate and movable plate, to guarantee that pressing plate and movable plate can normally and flexibly work, provide convenient for the work use of user.

[0015] 3. This utility model, through the setting of a limiting slide groove and an opening, allows the end of the connecting strip away from the groove to be movably installed in the opening, and the size of the inner cavity of the opening is sufficient to allow the connecting strip to move freely. The limiting slide groove is adapted to the limiting block. In this way, with the cooperation of the limiting block and the limiting slide groove, the movable plate can be limited and guided, ensuring the stability and smoothness of the movable plate's movement, and providing convenience for the user's work.

[0016] 4. This utility model features a rotating shaft that is fixedly installed on the inner wall of the movable cavity, while the pressing plate is movably installed on the rotating shaft. Under the action of the rotating shaft, the pressing plate can swing up and down flexibly, thereby pulling the movable plate and the pin up and down through the connecting strip, providing convenience for the user's work.

[0017] 5. This utility model, through the setting of sealing ring mounting grooves and sealing rings, provides sealing ring mounting grooves in both the main housing and the sub-housing. Both sealing ring mounting grooves are used to install the sealing rings. In this way, the sealing ring mounting grooves can position the sealing rings, improve the stability of the sealing rings after installation, and prevent the sealing rings from shifting during use. Under the action of the sealing rings, the sealing performance of the main housing and sub-housing assembly can also be improved, preventing oil leakage and providing convenience for users' work and use.

[0018] 6. This utility model, through the arrangement of a second drive shaft, a worm gear, a key block, an oil seal, and a flange, uses a second drive shaft to support the rotation of the worm gear. Driven by the worm wheel, the worm gear rotates synchronously, and the second drive shaft also rotates synchronously with the worm gear, thus ensuring the normal operation of the worm wheel and worm gear, and also ensuring the normal operation of the reducer. The oil seal and flange are used to install and fix the second drive shaft on the main housing and the auxiliary housing, ensuring the stability and firmness of the second drive shaft's rotation, improving the smoothness of the worm gear's rotation, and providing convenience for the user's work.

[0019] 7. This utility model, through the arrangement of drive shaft one, worm gear, oil seal two, oil seal three, and key block two, allows the worm gear to be fixedly mounted on drive shaft one and rotated by drive shaft one. The worm gear and worm are meshed, so when drive shaft one drives the worm gear to rotate, it can also drive the worm to rotate. Thus, the cooperation of the worm gear and worm can change the direction of power transmission, improving the flexibility of the reducer and providing users with greater flexibility and convenience. Key block two acts as a limit when drive shaft one is connected to the drive motor, ensuring that drive shaft one rotates synchronously when the motor rotates, guaranteeing that the reducer follows the motor's normal operation and providing convenience for users. Oil seal two and oil seal three are used to fix drive shaft one to the main housing, ensuring the stability and firmness of drive shaft one's rotation and improving the smoothness of worm gear rotation. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is an exploded three-dimensional structural diagram of the present invention;

[0023] Figure 3 A three-dimensional structural diagram of the main shell;

[0024] Figure 4 This is a partial three-dimensional exploded view of the present invention;

[0025] Figure 5 This is a bottom view of the three-dimensional structure of the sub-shell.

[0026] In the diagram: 1. Main housing, 2. Sub-housing, 3. Movable cavity, 4. Mounting groove, 5. Mounting strip, 6. Limiting block, 7. Movable plate, 8. Pin, 9. Spring, 10. Pressing plate, 11. Connecting strip, 12. Groove, 13. Opening, 14. Rotating shaft, 15. Limiting slide groove, 16. Sealing ring mounting groove, 17. Insertion hole, 18. Sealing ring, 19. Drive shaft one, 20. Worm gear, 21. Drive shaft two, 22. Worm, 23. Key block one, 24. Key block two, 25. Oil seal one, 26. Oil seal two, 27. Flange, 28. Oil seal three. Detailed Implementation

[0027] The following will refer to the appendix in the embodiments of this utility model. Figures 1-5 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model. Example

[0028] The utility model provides a high-precision gapless worm gear reducer, including main casing 1, the top of main casing 1 is provided with auxiliary casing 2, both sides of the top of main casing 1 are all seted up installation slot 4, both sides of the bottom of main casing 1 are all seted up movable cavity 3, both sides of movable cavity 3 inner chamber are all fixedly connected with limiting block 6, the surface of two limiting blocks 6 is slidably installed with movable plate 7, the top of movable plate 7 is fixedly connected with four spits 8, the inside of installation slot 4 is inserted with installation strip 5, the top of two installation strips 5 is all fixedly connected on auxiliary casing 2, the top of spits 8 penetrates to the inner chamber of installation slot 4 and is inserted into corresponding installation strip 5, the inner chamber of movable cavity 3 is seted up with the pressing plate 10 below movable plate 7, one end of pressing plate 10 is movably installed on movable plate 7, the surface of spits 8 is sleeved with spring 9, and both ends of spring 9 are fixedly connected on movable plate 7 and the inner wall of movable cavity 3 respectively, the bottom of installation strip 5 is seted up with the insertion hole 17 of adaptation with spits 8.

[0029] The specific use process is as follows: the user first presses one end of the pressing plate 10, that is, the end not connected with the movable plate 7, to the inner side of the movable cavity 3, and then with the pressing of one end of the pressing plate 10, the other end of the pressing plate 10, that is, the end connected with the movable plate 7, moves in the opposite direction, that is, downward, at the same time, the pressing plate 10 also drives the connecting strip 11 to move downward, the connecting strip 11 drives the movable plate 7 to slide and move downward in the movable cavity 3, at the same time, the movable plate 7 slides on the two limiting blocks 6, so that the two limiting blocks 6 can limit the movable plate 7, ensure that the movable plate 7 moves straight up and straight down, ensure the stability of the movable plate 7, provide convenience for the user's work and use, at the same time, the movable plate 7 also drives all the pins 8 to move out of the installation slot 4 and into the movable cavity 3, so that the end of the pin 8 moves out of the sealing ring 18 on the installation strip 5, so that the installation strip 5 can slide in the installation slot 4, then the user controls the sub-housing 2 to push to one side of the main housing 1, at the same time, the sub-housing 2 also drives the installation strip 5 to slide in the corresponding installation slot 4, so that the installation slot 4 can limit and guide the installation strip 5, at the same time, under the cooperation of the installation slot 4, the installation strip 5 and the pin 8, it also plays a role in fixing the sub-housing 2, so that all the pins 8 cooperate with the installation slot 4 to play the same role as the bolt, ensure the tightness and stability of the connection between the sub-housing 2 and the main housing 1, also ensure the stability of the worm gear engagement and the stability and smoothness of the speed reducer, provide convenience for the user's work and use, at the same time, on this basis, it also makes the speed reducer more convenient to assemble, improves the disassembly and assembly speed of the speed reducer, after all the accessories of the speed reducer are installed into the main housing 1, and the worm and the worm gear are adjusted to the engagement angle, the sub-housing 2 can be installed, during installation, the installation strip 5 on the sub-housing 2 is aligned with the installation slot 4 on the main housing 1, the installation strip 5 is inserted into the installation slot 4, and the sub-housing 2 is pushed until the installation strip 5 is completely inserted into the corresponding installation slot 4, finally, all the pins 8 are inserted into the corresponding insertion hole 17 to complete the fixation of the sub-housing 2, wherein, during the process of inserting the installation strip 5 into the installation slot 4, the pressing plate 10 needs to be pressed again, until the pressing plate 10 pulls all the pins 8 out of the inner cavity of the installation slot 4 through the connecting strip 11 and the movable plate 7, and then the installation strip 5 is inserted, because the part of the pin 8 inserted into the insertion hole 17 cannot be moved out of the inner cavity of the installation slot 4 by the extrusion of the installation strip 5, therefore, the user needs to actively control the pin 8 to move out of the inner cavity of the installation slot 4, so that the assembly of the sub-housing 2 and the main housing 1 can be quickly completed, thereby improving the disassembly and assembly efficiency of the speed reducer, providing convenience for the user's work and use, the two ends of the connecting strip 11 are movably installed on the pressing plate 10 and the movable plate 7, so that when the pressing plate 10 pulls the movable plate 7 to move, the connecting strip 11 can adapt to the pressing plate 10 and the movable plate 7, to ensure that the pressing plate 10 and the movable plate 7 can normally and flexibly move, provide convenience for the user's work and use,The end of the connecting strip 11 away from the groove 12 is movably mounted in the opening 13, and the size of the cavity in the opening 13 can meet the arbitrary movement of the connecting strip 11, the limiting sliding groove 15 is matched with the limiting block 6, so that the limiting sliding groove 15 and the limiting block 6 can limit and guide the movable plate 7, ensure the stability and smoothness of the movable plate 7, provide convenience for the user's work, the rotating shaft 14 is fixedly installed on the inner wall of the movable cavity 3, and the pressing plate 10 is movably installed on the rotating shaft 14, so that the pressing plate 10 can be flexibly swung up and down under the action of the rotating shaft 14, thereby pulling the movable plate 7 and the bolt 8 up and down through the connecting strip 11, providing convenience for the user's work, the main shell 1 and the auxiliary shell 2 are provided with sealing ring mounting grooves 16, and the two sealing ring mounting grooves 16 are used to install sealing rings 18, so that the sealing ring mounting grooves 16 can position the sealing rings 18, improve the stability of the sealing rings 18 after installation, avoid displacement of the sealing rings 18 in use, and improve the sealing performance of the main shell 1 and the auxiliary shell 2 under the action of the sealing rings 18, avoid oil leakage, provide convenience for the user's work, the driving shaft two 21 is used to support the worm 22 to rotate, so that the worm 22 will rotate synchronously under the drive of the worm gear 20, and the driving shaft two 21 will also rotate synchronously with the worm 22, so as to ensure the normal work of the worm gear 20 and the worm 22, and ensure the normal work of the speed reducer, wherein the oil seal one 25 and the flange 27 are used to fix the driving shaft two 21 on the main shell 1 and the auxiliary shell 2, so as to ensure the stability and firmness of the rotating work of the driving shaft two 21, improve the smoothness of the rotating work of the worm 22, and provide convenience for the user's work, the worm gear 20 is fixedly installed on the driving shaft one 19 and also rotates under the drive of the driving shaft one 19, and the worm gear 20 is engaged with the worm 22, so that the worm 22 can rotate under the drive of the worm gear 20 when the driving shaft one 19 rotates, so that the direction of power transmission can be changed under the cooperation of the worm gear 20 and the worm 22, improve the flexibility of the speed reducer, and provide convenience for the user's work, wherein the key block two 24 limits the driving shaft one 19 when the driving shaft one 19 is connected with the driving motor, so that the driving shaft one 19 can rotate synchronously when the motor rotates, ensure the normal operation of the speed reducer following the motor, provide convenience for the user's work, and the oil seal two 26 and the oil seal three 28 are used to fix the driving shaft one 19 on the main shell 1, so as to ensure the stability and firmness of the rotating work of the driving shaft one 19, and improve the smoothness of the rotating work of the worm gear 20.

[0030] The modular structure of the reducer shell is adopted, the whole shell is divided into a main shell and a sub-shell without changing the size of the reducer shell, after all components are arranged and installed in the main shell, the sub-shell is installed on the main shell, thereby the step of adjusting the angle position of the components is omitted, many limitations are avoided, the assembly speed of the reducer is accelerated, and the installation efficiency is improved.

[0031] One end of the pressing plate 10 is provided with a groove 12, a connecting strip 11 is movably installed in the groove 12, and the other end of the connecting strip 11 is movably installed on the movable plate 7.

[0032] Specifically, the connecting strip 11 and the groove 12 are arranged, and the two ends of the connecting strip 11 are movably installed on the pressing plate 10 and the movable plate 7 respectively, so that when the pressing plate 10 pulls the movable plate 7 to work, the connecting strip 11 can adapt to the pressing plate 10 and the movable plate 7, so that the pressing plate 10 and the movable plate 7 can normally and flexibly work, and convenience is provided for the user.

[0033] Both sides of the movable plate 7 are provided with limiting grooves 15 matched with the limiting blocks 6, and one side of the top of the movable plate 7 is provided with an opening 13 matched with the connecting strip 11.

[0034] Specifically, the limiting grooves 15 and the opening 13 are arranged, the other end of the connecting strip 11 is movably installed in the opening 13, and the size of the inner cavity of the opening 13 can meet the arbitrary working of the connecting strip 11, the limiting grooves 15 are matched with the limiting blocks 6, so that the movable plate 7 can be limited and guided under the cooperation of the limiting blocks 6 and the limiting grooves 15, the stability and smoothness of the movable plate 7 are ensured, and convenience is provided for the user.

[0035] A rotating shaft 14 is arranged on one side of the pressing plate 10, and the pressing plate 10 is movably installed in the inner cavity of the movable cavity 3 through the rotating shaft 14.

[0036] Specifically, the rotating shaft 14 is fixedly installed on the inner wall of the movable cavity 3, and the pressing plate 10 is movably installed on the rotating shaft 14, so that under the action of the rotating shaft 14, the pressing plate 10 can flexibly swing up and down, thereby the movable plate 7 and the bolt 8 are pulled up and down by the connecting strip 11, and convenience is provided for the user.

[0037] The top of the main shell 1 and the bottom of the sub-shell 2 are provided with sealing ring installation grooves 16, and sealing rings 18 are embedded in the inner cavities of the two sealing ring installation grooves 16.

[0038] Specifically, the sealing ring installation groove 16 and the sealing ring 18 are arranged, and the sealing ring installation groove 16 is arranged on the main shell 1 and the auxiliary shell 2. Both sealing ring installation grooves 16 are used to install the sealing ring 18. In this way, the sealing ring installation groove 16 can position the sealing ring 18, improve the stability of the sealing ring 18 after installation, avoid displacement of the sealing ring 18 in use, and improve the sealing performance of the main shell 1 and the auxiliary shell 2 under the action of the sealing ring 18, thereby avoiding oil leakage and providing convenience for users.

[0039] The main shell 1 and the auxiliary shell 2 are connected by a drive shaft two 21. The surface of the drive shaft two 21 is sleeved with a worm 22 located in the inner cavity of the main shell 1 and the auxiliary shell 2. One end of the drive shaft two 21 is sleeved with an oil seal one 25 embeddedly installed on the main shell 1 and the auxiliary shell 2. The end of the drive shaft two 21 away from the oil seal one 25 is sleeved with a flange 27 embeddedly installed on the main shell 1 and the auxiliary shell 2. One end of the surface of the drive shaft two 21 is fixedly connected with a key block one 23.

[0040] Specifically, the drive shaft two 21, the worm 22, the key block one 23, the oil seal one 25 and the flange 27 are arranged. The drive shaft two 21 is used to support the rotating work of the worm 22. In this way, the worm 22 will rotate synchronously under the driving of the worm gear 20, and the drive shaft two 21 will also rotate synchronously with the worm 22, thereby ensuring the normal work of the worm gear 20 and the worm 22 and the normal work of the speed reducer. The oil seal one 25 and the flange 27 are used to install and fix the drive shaft two 21 on the main shell 1 and the auxiliary shell 2, thereby ensuring the stability and firmness of the rotating work of the drive shaft two 21 and improving the fluency of the rotating work of the worm 22, thereby providing convenience for users.

[0041] A drive shaft one 19 is arranged on one side of the inner cavity of the main shell 1. The surface of the drive shaft one 19 is fixedly installed with a worm gear 20 located in the inner cavity of the main shell 1. The worm gear 20 is engaged with the worm 22. One end of the drive shaft one 19 is sleeved with an oil seal three 28 embeddedly connected to the main shell 1. The end of the drive shaft one 19 away from the oil seal three 28 is sleeved with an oil seal two 26 embeddedly connected to the main shell 1. One end of the surface of the drive shaft one 19 is fixedly connected with a key block two 24.

[0042] Specifically, the arrangement of the drive shaft 19, the worm gear 20, the oil seal 26, the oil seal 28 and the key block 24, the worm gear 20 is fixedly installed on the drive shaft 19, and is also driven to rotate by the drive shaft 19, and the worm gear 20 is engaged with the worm 22, so that the worm 22 can be driven to rotate when the drive shaft 19 drives the worm gear 20 to rotate, so that the direction of power transmission can be changed under the cooperation of the worm gear 20 and the worm 22, the flexibility of the speed reducer is improved, and the flexibility and convenience of the user are improved. The key block 24 is used for limiting the drive shaft 19 when the drive shaft 19 is connected with the driving motor, so that the drive shaft 19 can rotate synchronously when the motor rotates, the speed reducer can normally operate with the motor, and the user's work is convenient. The oil seal 26 and the oil seal 28 are used for fixing the drive shaft 19 on the main shell 1, so as to ensure the stability and firmness of the drive shaft 19 rotating, and improve the smoothness of the worm gear 20 rotating.

[0043] It should be noted that the functions of the hardware in the utility model have been supported by a large number of mature technologies, and belong to the prior art. The essence of the utility model is to optimize and combine the existing hardware and its connection mode for specific application occasions to meet the adaptive requirements of specific application occasions, solve the problems in the background art (not related to the improvement of the internal software of the hardware).

[0044] The above only describes the preferred embodiments of the utility model, and does not limit the utility model. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the utility model should be included in the protection scope of the utility model.

Claims

1. A high-precision, backlash-free worm gear reducer, comprising a main housing (1), characterized in that: The main housing (1) has a sub-housing housing (2) on its top. Mounting grooves (4) are provided on both sides of the top of the main housing (1). Movable cavities (3) are provided on both sides of the bottom of the main housing (1). Limiting blocks (6) are fixedly connected to both sides of the inner cavity of each movable cavity (3). Movable plates (7) are slidably mounted on the surfaces of the two limiting blocks (6). Four pins (8) are fixedly connected to the top of each movable plate (7). Mounting strips (5) are inserted into the interior of the mounting grooves (4). The tops of the two mounting strips (5) are fixedly connected to the sub-housing housing (2). 2) The top of the pin (8) extends through the inner cavity of the mounting groove (4) and is inserted into the corresponding mounting strip (5). The inner cavity of the movable cavity (3) is provided with a pressing plate (10) located below the movable plate (7). One end of the pressing plate (10) is movably mounted on the movable plate (7). A spring (9) is sleeved on the surface of the pin (8). The two ends of the spring (9) are respectively fixedly connected to the inner wall of the movable plate (7) and the movable cavity (3). The bottom of the mounting strip (5) is provided with a socket (17) that matches the pin (8).

2. The high-precision zero-backlash worm gear reducer according to claim 1, characterized in that: The pressing plate (10) has a groove (12) at one end, and a connecting strip (11) is movably installed inside the groove (12). The end of the connecting strip (11) away from the groove (12) is movably installed on the movable plate (7).

3. The high-precision zero-backlash worm gear reducer according to claim 2, characterized in that: The movable plate (7) has a limiting groove (15) on both sides that is compatible with the limiting block (6), and an opening (13) on one side of the top of the movable plate (7) that is compatible with the connecting strip (11).

4. A high-precision zero-backlash worm gear reducer according to claim 3, characterized in that: A rotating shaft (14) is provided through one side of the pressing plate (10), and the pressing plate (10) is movably installed in the inner cavity of the movable cavity (3) through the rotating shaft (14).

5. A high-precision zero-backlash worm gear reducer according to claim 4, characterized in that: The top of the main housing (1) and the bottom of the sub-housing (2) are provided with sealing ring mounting grooves (16), and sealing rings (18) are embedded in the inner cavity of the two sealing ring mounting grooves (16).

6. A high-precision zero-backlash worm gear reducer according to claim 5, characterized in that: A second drive shaft (21) is fitted between the main housing (1) and the secondary housing (2). A worm gear (22) located in the inner cavity of the main housing (1) and the secondary housing (2) is sleeved on the surface of the second drive shaft (21). An oil seal (25) embedded in the main housing (1) and the secondary housing (2) is sleeved on one end of the second drive shaft (21). A flange (27) embedded in the main housing (1) and the secondary housing (2) is sleeved on the other end of the second drive shaft (21) away from the oil seal (25). A key block (23) is fixedly connected to one end of the surface of the second drive shaft (21).

7. A high-precision zero-backlash worm gear reducer according to claim 6, characterized in that: A drive shaft (19) is provided through one side of the inner cavity of the main housing (1). A worm gear (20) located in the inner cavity of the main housing (1) is fixedly installed on the surface of the drive shaft (19). The worm gear (20) meshes with the worm (22). One end of the drive shaft (19) is sleeved with an oil seal (28) embedded in the main housing (1). The end of the drive shaft (19) away from the oil seal (28) is sleeved with an oil seal (26) embedded in the main housing (1). One end of the surface of the drive shaft (19) is fixedly connected with a key block (24).

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