Screwing main machine

Abstract

The utility model belongs to the technical field of new energy power conversion equipment, and particularly relates to a screwing main machine for power conversion equipment. The screwing main machine comprises a motor (2), a speed reducer assembly, a first transmission gear (51), a second transmission gear (52) and a driving box (7). When the main screwing machine works, the rotating speed is reduced and the torque is increased through the speed reducer assembly, then the rotating speed is further reduced and the torque is further increased through meshing transmission of the first transmission gear (51) and the second transmission gear (52), and finally the output rotating speed and torque meet the requirement for screwing screws. Due to the fact that a transmission device for changing the transmission direction does not need to be arranged independently, the size of the screwing main machine is greatly reduced. Meanwhile, the screwing head is arranged in the direction parallel to the axis of the motor (2), and compared with the mode that the screwing head is directly arranged on the axis extension line of the motor (2), the overall height of the screwing main machine after the screwing head is installed can be shortened.

Description

Technical Field

[0001] This utility model belongs to the field of new energy battery swapping equipment technology, and specifically relates to a screwing host for battery swapping equipment. Background Technology

[0002] Electric vehicle battery swapping stations are a key facility for addressing "range anxiety," and their core function is to enable rapid battery replacement through a modular system. The electric vehicle battery swapping process includes: lifting the vehicle body to expose the chassis battery pack; unlocking the chassis battery pack; replacing the battery pack; and lowering the vehicle body. When removing or installing the battery, multiple screwdrivers are used to quickly turn the screws according to the location of the screw holes.

[0003] Chinese patent CN109483212B discloses a screwing tool for a car battery swapping device. The screwing tool includes a motor, a reducer, and a screwing head. Because the screwing tool is composed of a motor and a reducer, and also requires an intersecting shaft transmission mechanism to arrange the motor and reducer at a certain angle to the screwing head, the overall volume of the screwing tool is relatively large. Utility Model Content

[0004] In view of this, the present invention proposes a screwdriver main unit, which aims to make the screwdriver main unit more compact and smaller in size.

[0005] The rotary wrench unit of this utility model includes a motor, a reducer assembly, a first transmission gear, a second transmission gear, and a drive box. The reducer assembly is connected to the output end of the motor. The first transmission gear is connected to the output end of the reducer assembly. The second transmission gear meshes with the first transmission gear and is larger in diameter than the first transmission gear, and the second transmission gear has an axially formed connection portion for a wrench head. The motor, reducer assembly, and first transmission gear are arranged along a first axis, and the second transmission gear is arranged on a second axis parallel to the first axis, meshing with the first transmission gear. A driver is housed inside the drive box, and the driver is connected to the motor via a cable.

[0006] When the aforementioned screw-tightening machine is operating, as the driver in the drive box drives the motor to rotate, the speed is first reduced and the torque increased by the reducer assembly. Then, the meshing of the first and second transmission gears further reduces the speed and increases the torque, ultimately ensuring that the output speed and torque meet the requirements for screw tightening. Since there is no need for a separate transmission device to change the transmission direction, the size of the screw-tightening machine is greatly reduced. Simultaneously, positioning the screw-tightening head parallel to the motor's axis, compared to directly mounting it on the extension of the motor's axis, also helps to shorten the overall height of the screw-tightening machine after the screw-tightening head is installed. Furthermore, the drive box isolates the driver and motor, which helps to avoid mutual heat interference between the driver and motor, improving the overall heat dissipation of the screw-tightening machine.

[0007] In a preferred embodiment of the above-described screwdriver assembly of this utility model, the housing assembly of the screwdriver assembly includes a main housing and a base plate. The main housing forms a first mounting cavity and a second mounting cavity, the first mounting cavity being disposed along a first axis, and the second mounting cavity being disposed along a second axis. The portion of the base plate corresponding to the second mounting cavity is connected to the bottom end of the main housing. The motor and reducer assembly is mounted to the first mounting cavity, the first transmission gear is disposed on the base plate and directly opposite the first mounting cavity, and the second transmission gear is mounted between the second mounting cavity and the base plate.

[0008] In a preferred embodiment of the aforementioned screw-twisting main unit of this utility model, the screw-twisting main unit further includes a ninth bearing and a fourth pressure ring. The inner ring of the ninth bearing is connected to the upper part of the main shaft of the second transmission gear. A second annular mounting platform is formed around the second mounting cavity on the upper inner side of the main housing, and the ninth bearing is supported on the second annular mounting platform. Furthermore, the outer edge of the fourth pressure ring is connected to the main housing, and a convex ring is formed at its bottom to press against the outer ring of the ninth bearing. A fourth annular mounting platform is formed on its top inner wall, and a through hole is formed in the middle of the fourth annular mounting platform for the upper part of the second transmission gear to pass through.

[0009] In a preferred embodiment of the above-mentioned screwing host of the present invention, the screwing host further includes a first sealing ring, which is supported on the fourth annular mounting platform, and its inner circumferential sidewall is sealed to the outer circumferential sidewall of the upper part of the second transmission gear.

[0010] In a preferred embodiment of the above-mentioned screwing host of the present invention, the screwing host further includes a tenth bearing, the inner ring of the tenth bearing is connected to the lower part of the main shaft of the second transmission gear, and a third annular mounting platform is formed on the base plate, and the tenth bearing is supported on the third annular mounting platform.

[0011] In a preferred embodiment of the above-mentioned screwing host of the present invention, the screwing host further includes a second sealing ring, the inner circumferential sidewall of the second sealing ring is sealed to the sidewall of the lower part of the second transmission gear spindle, and the base plate forms a third radial annular groove below the third annular mounting platform, and the second sealing ring is disposed in the third radial annular groove.

[0012] In a preferred embodiment of the above-described screw-twisting main unit of this utility model, the second transmission gear comprises a shaft cylinder portion, an outer gear disk portion, and an inner connecting disk portion. The outer gear disk portion is coaxially disposed on the outer side wall of the shaft cylinder portion, and the inner connecting disk portion is coaxially disposed on the inner side wall of the shaft cylinder portion. The inner connecting disk portion is provided with a drainage hole and a connecting hole for cooperating with the screw-twisting head. The base plate forms a through hole adapted to the outer diameter of the shaft cylinder portion, and the lower section of the shaft cylinder portion extends to this through hole.

[0013] In a preferred embodiment of the above-mentioned screwing host of this utility model, the screwing host further includes an eighth bearing, the inner ring of the eighth bearing is connected to the circumferential outer wall of the axial bottom end of the first transmission gear, and the inner wall of the part of the base plate corresponding to the first mounting cavity is provided with a bearing support groove, and the eighth bearing is disposed in the bearing support groove.

[0014] In a preferred embodiment of the above-described screwdriver of this utility model, the drive box is connected to the outer wall of the housing assembly and is close to the first mounting cavity. The drive box has a closed-loop sealing groove formed on the outer wall of the housing assembly, and a sealing strip is disposed within the closed-loop sealing groove, the sealing strip being in close contact with the outer wall of the housing assembly. Furthermore, the drive box has screw holes and cable through holes for connection to the housing assembly, the screw holes and cable through holes being distributed within the area enclosed by the closed-loop sealing groove on the outer wall of the drive box.

[0015] In a preferred embodiment of the above-mentioned turning host of the present invention, a hexagonal mounting head is formed at the axial top end of the first transmission gear, a hexagonal mounting hole is formed at the bottom of the output end of the reducer assembly, the hexagonal mounting head extends into the hexagonal mounting hole for limiting engagement, and the wheel portion of the first transmission gear is bolted to the bottom end face of the output end of the reducer assembly. Attached Figure Description

[0016] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that those skilled in the art can more clearly understand the above and other features and advantages of the present invention, in which:

[0017] Figure 1 This is a schematic diagram of the external structure of the screwing main unit of this utility model.

[0018] Figure 2 This is an exploded structural diagram of the screwing main unit of this utility model.

[0019] Figure 3 This is an exploded structural diagram of the housing assembly of the screw-on main unit of this utility model from a top view.

[0020] Figure 4 This is an exploded view of the housing assembly of the screw-on main unit of this utility model from the bottom.

[0021] Figure 5 This is a schematic diagram of the drive box of the screw-on main unit of this utility model.

[0022] Figure 6 This is a schematic diagram of the connection structure between the first and second transmission gears of the screwing main unit of this utility model and the main housing.

[0023] Figure 7 This is a schematic diagram of the connection structure between the first and second transmission gears of the screwing main unit of this utility model and the base plate.

[0024] Figure 8 This is a schematic diagram of the base plate of the screwing main unit of this utility model.

[0025] Figure 9 This is a schematic diagram of the connection structure between the two-stage planetary reducer, the main housing, and the first pressure plate of the rotary machine of this utility model.

[0026] Figure 10 This is a schematic diagram of the connection structure between the second gear ring and the main housing of the screwing main unit of this utility model.

[0027] Figure 11 This is a schematic diagram of the connection structure between the top of the main housing of the rotary host of this utility model and the first-stage planetary reducer.

[0028] Figure 12 This is a schematic diagram of the connection structure between the top of the main housing of the rotary host of this utility model and the motor and the second transmission gear.

[0029] Figure 13 This is a schematic diagram of the connection structure between the main housing of the screwing host of this utility model and the mounting plate and the fourth pressure ring.

[0030] Figure 14 This is a cross-sectional structural diagram of the screwing main unit of this utility model corresponding to the second mounting cavity.

[0031] Figure 15 This is a schematic diagram of the assembly structure of the second transmission gear of the screwdriver of this utility model.

[0032] Figure 16This is an exploded structural diagram of the second transmission gear of the screwdriver of this utility model.

[0033] Figure 17 This is a schematic diagram of the connection structure between the first transmission gear and the second-stage planetary reducer of the rotary machine of this utility model.

[0034] Figure 18 This is a schematic diagram of the structure and assembly of the two-stage planetary reducer of the rotary machine of this utility model.

[0035] Figure 19 This is a schematic diagram of the connection structure between the motor and the first sun gear of the screwing main unit of this utility model.

[0036] Figure 20 This is a schematic diagram of the bottom structure of the motor of the rotary main unit of this utility model.

[0037] Figure 21 This is a schematic diagram of the top connection structure of the motor of the rotary main unit of this utility model.

[0038] Figure 22 This is a schematic diagram of the motor itself in the rotary machine of this utility model.

[0039] Figure 23 This is a schematic diagram of the structure of the main housing of the screwing host of this utility model corresponding to the first mounting cavity.

[0040] Figure 24 This is a schematic diagram of the connection structure between the mounting plate of the screwing main unit and the first bearing of this utility model.

[0041] Figure 25 This is a cross-sectional structural diagram of the first mounting cavity of the screwing main unit of this utility model.

[0042] Figure 26 This is a schematic diagram of the overall assembly structure of the motor, reducer assembly and first transmission gear of the rotary host of this utility model.

[0043] Figure 27 This is a first exploded view of the overall structure of the motor, reducer assembly and first transmission gear of the rotary host of this utility model.

[0044] Figure 28 This is a schematic diagram of the connection structure between the first-stage planetary reducer and the second sun gear of the rotary machine of this utility model.

[0045] Figure 29 This is a schematic diagram of the connection structure of the first-stage planetary reducer of the rotary machine of this utility model.

[0046] Figure 30 This is a schematic diagram of the connection structure of the two-stage planetary reducer of the rotary machine of this utility model.

[0047] Figure 31 This is a schematic diagram of the connection structure between the two-stage planetary reducer and the main housing of the rotary machine of this utility model.

[0048] Figure 32 This is a schematic diagram showing the position and structure of the first-stage planetary reducer of the rotary machine of this utility model within the main housing.

[0049] Figure 33 This is a second schematic diagram of the overall exploded structure of the motor, reducer assembly and first transmission gear of the rotary host of this utility model.

[0050] Figure 34 This is a schematic diagram of the structure of the second pressure plate of the screwing main unit of this utility model.

[0051] The accompanying figure is labeled as follows:

[0052] 1-Housing assembly;

[0053] 11-Main housing; 111-First mounting cavity; 112-Second mounting cavity; 113-Annular groove; 1131-Inner annular wall; 1132-Top opening; 1133-First radial annular groove; 1134-Annular boss; 114-Second axial annular groove; 115-Second annular mounting platform;

[0054] 12-Base plate; 121-Third annular mounting platform; 122-Third radial annular groove; 123-Through hole; 124-Bearing support groove;

[0055] 13-Mounting plate; 131-Recessed step; 132-Bearing mounting groove; 133-Central opening;

[0056] 14-First pressure plate; 141-Central circular hole; 1411-Second annular step;

[0057] 15-Second pressure plate; 151-Annular groove; 152-Second radial annular groove;

[0058] 16-Top plate;

[0059] 2-Motor; 21-Outer stator; 22-Inner rotor; 221-Magnet; 222-Iron core ring; 223-Motor shaft; 2231-Support ring; 2232-Bracket; 2233-Shaft; 22331-Mounting shaft hole; 22332-First annular mounting platform;

[0060] 201 - Accommodation space;

[0061] 3-Single-stage planetary reducer;

[0062] 31-First sun gear; 311-First shaft section; 312-First gear section; 313-First shaft disc section;

[0063] 32-First planetary carrier; 321-Support and limiting stage; 322-Hexagonal shaft hole;

[0064] 33 - First Planetary Gear;

[0065] 34 - First gear ring;

[0066] 4-Two-stage planetary reducer;

[0067] 41-Second sun gear; 411-Second shaft; 4111-Hexagonal shaft head; 412-Second gear; 413-Second shaft disc;

[0068] 42-Second planetary carrier; 421-First annular step; 422-Hexagonal mounting hole;

[0069] 43 - Second planetary gear;

[0070] 44 - Second gear ring;

[0071] 51-First transmission gear; 511-Hexagonal mounting head; 512-Disc section;

[0072] 52-Second transmission gear; 521-Connecting part; 522-Shaft sleeve part; 523-External gear plate part; 524-Inner connecting plate part; 5241-Drain hole; 5242-Connecting hole;

[0073] 61-Rotor disc; 62-Stator disc;

[0074] 7-Driver box; 701-Closed-loop sealing groove; 702-Screw hole; 703-Cable through hole; 71-Driver;

[0075] 81-First bearing; 82-Second bearing; 83-Third bearing; 84-Fourth bearing; 85-Fifth bearing; 86-Sixth bearing; 87-Seventh bearing; 88-Eighth bearing; 89-Ninth bearing; 810-Tenth bearing;

[0076] 91-First pressure ring; 92-Open pressure ring; 93-Second pressure ring; 931-Fixing ring; 932-Pressure ring part; 94-Third pressure ring; 95-Sealing ring; 96-Fourth pressure ring; 961-Fourth annular mounting platform; 962-Protruding ring; 963-Through hole; 97-First sealing ring; 98-Second sealing ring. Detailed Implementation

[0077] To make the objectives, technical solutions and advantages of this utility model clearer, the following embodiments are provided to further illustrate this utility model in detail.

[0078] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0079] The screw-screwing machine provided in this embodiment is used in a battery swapping device, which may include a lifting platform and multiple screw-screwing machines. The multiple screw-screwing machines are arranged on the lifting platform according to the positions of the screws securing the battery on the vehicle. When the screw-screwing machine drives the screw head to rotate, it removes or installs the screws securing the battery on the vehicle.

[0080] In one possible use case, the lifting platform rises to a position close to the bottom of the car's battery. The rotary actuator drives the rotary head to remove the screws, thus detaching the old battery. The lifting platform then lowers along with the old battery. After the new battery is placed on the lifting platform, the platform rises again, and the rotary actuator drives the rotary head to tighten the screws, installing the new battery into the car.

[0081] Example 1

[0082] Combination Figures 1 to 16 In the illustrated embodiment, the main unit for turning includes a motor 2, a reducer assembly, a first transmission gear 51, a second transmission gear 52, and a drive box 7. The first transmission gear 51 is connected to the output end of the reducer assembly. The second transmission gear 52 meshes with the first transmission gear 51 and has a diameter larger than that of the first transmission gear 51. The second transmission gear 52 also has an axially formed connecting portion 521 for a turning head.

[0083] The motor 2, the reducer assembly, and the first transmission gear 51 are arranged along the first axis, and the second transmission gear 52 is arranged on the second axis parallel to the first axis, and the second transmission gear 52 meshes with the first transmission gear 51.

[0084] When the aforementioned screw-tightening machine is working, as the driver 71 inside the drive box 7 drives the motor 2 to rotate, the speed is first reduced and the torque is increased through the reducer assembly. Then, the speed is further reduced and the torque is increased through the meshing of the first transmission gear 51 and the second transmission gear 52, ultimately ensuring that the output speed and torque meet the requirements for screw tightening. Since there is no need to separately set up a transmission device to change the transmission direction, the size of the screw-tightening machine is greatly reduced. At the same time, setting the screw-tightening head parallel to the axis of the motor 2, compared to setting the screw-tightening head directly on the extension line of the motor 2's axis, also helps to shorten the overall height of the screw-tightening machine after the screw-tightening head is installed.

[0085] Furthermore, the drive box 7 contains a driver 71, which is connected to the motor 2 via a cable. The drive box 7 isolates the driver 71 and the motor 2, which helps to prevent the heat from affecting each other, improves the overall heat dissipation of the screwdriver, and facilitates the maintenance of the driver 71 inside the drive box 7.

[0086] Reference Figures 2 to 4 In a preferred embodiment of the aforementioned screwdriver, the housing assembly 1 of the screwdriver may include a main housing 11 and a base plate 12. The main housing 11 has a first mounting cavity 111 and a second mounting cavity 112, the first mounting cavity 111 being disposed along a first axis and the second mounting cavity 112 being disposed along a second axis. The portion of the base plate 12 corresponding to the second mounting cavity 112 is connected to the bottom end of the main housing 11.

[0087] The motor 2 and the reducer assembly are installed in the first mounting cavity 111, the first transmission gear 51 is mounted on the base plate 12 and faces the first mounting cavity 111, and the second transmission gear 52 is installed between the second mounting cavity 112 and the base plate 12. In this way, the motor 2, the reducer assembly, the first transmission gear 51, and the second transmission gear 52 can be fixed by the main housing 11 and the base plate 12.

[0088] Combination Figure 1 and Figure 5 The drive box 7 is connected to the outer wall of the housing assembly 1 and is close to the first mounting cavity 111. The drive box 7 has a closed-loop sealing groove 701 formed on the outer wall of the housing assembly 1, and a sealing strip is provided in the closed-loop sealing groove 701, with the sealing strip closely attached to the outer wall of the housing assembly 1.

[0089] And, combined Figure 5 The drive box 7 is provided with screw holes 702 and cable through holes 703 for connection with the housing assembly 1. The screw holes 702 and cable through holes 703 are distributed within the area enclosed by the closed-loop sealing groove 701 on the outer wall of the drive box 7. Thus, since the screw holes 702 and cable through holes 703 between the drive box 7 and the housing assembly 1 are located within the area enclosed by the sealing strip, water corrosion of the screws or water entering the housing assembly 1 or the drive box 7 through the cable through holes 703 can be prevented.

[0090] Combination Figure 3 and Figures 12 to 16In the preferred embodiment shown, the rotary head further includes a ninth bearing 89 and a fourth pressure ring 96. The inner ring of the ninth bearing 89 is connected to the upper part of the main shaft of the second transmission gear 52. A second annular mounting platform 115 is formed on the upper inner side of the main housing 11 around the second mounting cavity 112, and the ninth bearing 89 is supported on the second annular mounting platform 115. The outer edge of the fourth pressure ring 96 is connected to the main housing 11, and a convex ring 962 is formed at its bottom to press against the outer ring of the ninth bearing 89. In this way, a rotational support connection is achieved between one end of the second transmission gear 52 and the housing assembly 1.

[0091] Combination Figure 13 and Figure 16 In the preferred embodiment shown, a fourth annular mounting platform 961 is formed on the top inner wall of the fourth pressure ring 96, and a through hole 963 is formed in the middle of the fourth annular mounting platform 961 for the upper part of the second transmission gear 52 to pass through. The screwdriver also includes a first sealing ring 97, which is supported on the fourth annular mounting platform 961, and its inner circumferential sidewall seals against the outer circumferential sidewall of the upper part of the second transmission gear 52. This helps prevent water or dust from entering the main housing 11 through the gap between the upper part of the second transmission gear 52 and the main housing 11.

[0092] Combination Figure 3 , Figures 14 to 16 In a preferred embodiment of the rotary head shown, the rotary head further includes a tenth bearing 810, the inner ring of which is connected to the lower part of the main shaft of the second transmission gear 52. A third annular mounting platform 121 is formed on the base plate 12, and the tenth bearing 810 is supported on the third annular mounting platform 121. In this way, a rotational support connection is achieved between the lower part of the main shaft of the second transmission gear 52 and the housing assembly 1.

[0093] Combination Figures 14 to 16 In a preferred embodiment of the rotary head shown, the rotary head further includes a second sealing ring 98. The inner circumferential sidewall of the second sealing ring 98 seals against the sidewall of the lower part of the main shaft of the second transmission gear 52. The base plate 12 has a third radial annular groove 122 formed below the third annular mounting platform 121, and the second sealing ring 98 is disposed in the third radial annular groove 122. This prevents water or dust from entering the second mounting cavity 112 from the gap between the second transmission gear 52 and the base plate 12.

[0094] Combination Figure 1 and Figures 14 to 16In the preferred embodiment of the rotary head shown, the second transmission gear 52 is provided with a shaft sleeve portion 522, an outer gear disk portion 523, and an inner connecting disk portion 524. The outer gear disk portion 523 is coaxially disposed on the outer side wall of the shaft sleeve portion 522, and the inner connecting disk portion 524 is coaxially disposed on the inner side wall of the shaft sleeve portion 522. The inner connecting disk portion 524 is provided with a drainage hole 5241 and a connecting hole 5242 that mates with the rotary head. The base plate 12 has a through hole 123 that matches the outer diameter of the shaft sleeve portion 522, and the lower section of the shaft sleeve portion 522 extends to the through hole 123. Thus, while achieving the connection and mating of the second transmission gear 52 with the rotary head, it also adapts to rainy weather conditions, allowing rainwater or mud to drain through the drainage hole 5241, ensuring that the rotary head is not affected by rain or snow.

[0095] Combination Figures 8 to 10 as well as Figure 17 and Figure 18 In a preferred embodiment of the shown rotary head, the reducer assembly may include a first-stage planetary reducer 3 and a second-stage planetary reducer 4. A hexagonal mounting head 511 is formed at the axial top of the first transmission gear 51. A hexagonal mounting hole 422 is formed at the bottom of the output end of the reducer assembly, such as the output end of the second planetary carrier 42 of the second-stage planetary reducer 4. The hexagonal mounting head 511 extends into the hexagonal mounting hole 422 for a limiting fit, and the disc portion 512 of the first transmission gear 51 is bolted to the bottom end face of the output end of the reducer assembly. Thus, since the disc portion 512 of the first transmission gear 51 and the output end of the reducer assembly are in close contact without any gap, it is beneficial to shorten the axial dimensions of the first transmission gear 51 and the reducer assembly.

[0096] Combination Figures 6 to 8 In a preferred embodiment of the rotary head shown, the rotary head further includes an eighth bearing 88. The inner ring of the eighth bearing 88 is connected to the circumferential outer wall of the axial bottom end of the first transmission gear 51. A bearing support groove 124 is provided on the inner wall of the portion of the base plate 12 corresponding to the first mounting cavity 111, and the eighth bearing 88 is disposed within the bearing support groove 124. In this way, the first transmission gear 51 is rotatably connected relative to the housing assembly 1.

[0097] Example 2

[0098] Combination Figure 1 and Figure 2In the illustrated embodiment of the rotary head unit, the rotary head unit includes a housing assembly 1, a motor 2, a reducer assembly, a first transmission gear 51, and a second transmission gear 52. The main housing 11 of the housing assembly 1 forms a first mounting cavity 111 and a second mounting cavity 112 with parallel axes. The motor 2 is mounted at the top axial direction of the first mounting cavity 111, and a receiving space 201 is formed on the inner side of the bottom axial direction of the motor 2. The reducer assembly is located in the first mounting cavity 111, and the input side of the reducer assembly extends into the receiving space 201 of the motor 2 and is connected to the rotating shaft 2233 of the motor 2.

[0099] Furthermore, the first transmission gear 51 is connected to the output side of the reducer assembly. The second transmission gear 52 is installed in the second mounting cavity 112, and the second transmission gear 52 meshes with the first transmission gear 51 and has a diameter larger than that of the first transmission gear 51. The second transmission gear 52 also has a connecting portion 521 with a screwing head in the axial direction.

[0100] For example, each screwdriver can be independently configured with a drive box 7 to drive the motor 2, or all screwdrivers can be connected to a control cabinet via cables, which integrates multiple drive units.

[0101] When the aforementioned screw-tightening machine is operating, after the motor 2 outputs power, the speed is first reduced and the torque is increased through the reducer assembly. Then, the speed is further reduced and the torque is increased through the meshing of the first transmission gear 51 and the second transmission gear 52, ultimately ensuring that the output speed and torque meet the requirements for screw tightening. Since there is no need for a separate transmission device to change the transmission direction, the size of the screw-tightening machine is greatly reduced. Simultaneously, setting the screw-tightening head parallel to the axis of the motor 2, compared to setting the screw-tightening head directly on the extension line of the motor 2's axis, also helps to shorten the overall height of the screw-tightening machine after the screw-tightening head is installed. Furthermore, the receiving space 201 formed by the input side of the reducer assembly extending into the axial bottom of the motor 2 helps to shorten the overall axial dimension of the screw-tightening machine.

[0102] Combination Figure 2 and Figure 17 and Figure 18 In a preferred embodiment of the shown rotary head unit, the reducer assembly includes a first-stage planetary reducer 3 and a second-stage planetary reducer 4. The axial tip of the first transmission gear 51 extends into a limiting hole at the axial bottom end of the second planetary carrier 42 of the second-stage planetary reducer 4, and the disc portion 512 of the first transmission gear 51 is bolted to the end face of the axial bottom end of the second planetary carrier 42. Thus, because the disc portion 512 of the first transmission gear 51 and the output end of the reducer assembly are in close contact without any gap, it is beneficial to shorten the axial dimension of the first transmission gear 51 reducer assembly.

[0103] Combination Figures 19 to 22 In the preferred embodiment of the rotating main unit shown, the motor 2 includes an outer stator 21 and an inner rotor 22. The inner rotor 22 is located inside the outer stator 21, and the motor shaft 223 of the inner rotor 22 has a support ring 2231, a bracket 2232 and a rotating shaft 2233. The top end of the support ring 2231 is connected to the rotating shaft 2233 through the bracket 2232.

[0104] For example, the inner rotor 22 is provided with a magnet 221, an iron core ring 222 and a motor shaft 223 arranged in sequence from the outside to the inside in the radial direction. The axial height of the inner rotor 22 is less than that of the outer stator 21, and the axial height of the motor shaft 2233 is less than that of the support ring 2231, so as to form a receiving space 201 on the inner side of the bottom of the motor 2 in the axial direction.

[0105] Thus, by reducing the size of the internal structure of the motor 2 itself, a receiving space 201 is formed for the input side of the reducer assembly to extend into, thereby shortening the axial dimension of the turning host.

[0106] Combination Figure 3 , Figure 11 , Figure 22 and Figure 23 In a preferred embodiment of the rotating main unit shown, an annular groove 113 is formed in the upper part of the first mounting cavity 111 of the main housing 11. The annular groove 113 is surrounded by the circumferential inner wall, the annular bottom wall, and the inner annular wall 1131 of the first mounting cavity 111. The outer stator 21 and the support ring 2231 of the motor 2 are disposed in the annular groove 113. For example, the magnets 221, the core ring 222, and the support ring 2231 of the inner rotor 22 of the motor 2 can all be disposed in the annular groove 113. In this way, the motor 2 is supported in the annular groove 113 of the main housing 11. Furthermore, the reducer assembly is connected to the rotating shaft 2233 of the motor 2 through the top opening 1132 of the inner annular wall 1131.

[0107] Combination Figure 13 as well as Figures 21 to 25 In a preferred embodiment of the rotating main unit shown, the rotating main unit further includes a mounting plate 13 and a first bearing 81. The outer edge of the mounting plate 13 is connected to the outer top wall of the main housing 11 surrounding the first mounting cavity 111, and the middle portion of the mounting plate 13 is recessed towards the first mounting cavity 111 to form a recessed step portion 131. At least a portion of the bottom end of the recessed step portion 131 extends into the top side of the outer stator 21 of the motor 2. Furthermore, the recessed step portion 131 is provided with a central opening 133 facing the rotating shaft 2233 of the motor 2, and a bearing mounting groove 132 surrounding the central opening 133 is formed on the bottom side of the mounting plate 13. The first bearing 81 is disposed in the bearing mounting groove 132, and the inner ring of the first bearing 81 is connected to the rotating shaft 2233 of the motor 2. Figure 22The top of the rotating shaft 2233 of the motor 2 is located within the height range of the top side of the outer stator 21. In this way, by cooperating with the recessed step portion 131 of the mounting plate 13, the shorter rotating shaft 2233 of the motor 2 achieves a rotational support connection between the motor 2 and the housing assembly 1, which helps to shorten the overall axial dimension of the screwdriver.

[0108] Combination Figure 12 and Figure 13 In a preferred embodiment of the shown screwdriver, the screwdriver further includes an encoder assembly comprising a rotor disk 61 and a stator disk 62. The encoder assembly can be either a magnetic encoder or an inductive encoder. For example, when the encoder assembly is a magnetic encoder, the rotor disk 61 can be a magnetic ring. The rotor disk 61 can be mounted on a first annular mounting platform 22332 at the top of the shaft 2233 of the motor 2, and axially extends beyond the top side of the outer stator 21 of the motor 2, being closer axially to the top wall of the mounting plate 13 relative to the first bearing 81. The stator disk 62 is connected to the outer top wall of the mounting plate 13 and faces the rotor disk 61.

[0109] Thus, after the mounting plate 13 forms the recessed step portion 131, the mounting plate 13 just forms the receiving space 201 for the stator disk 62 on its top. The mounting structure of the encoder assembly in this embodiment also helps to maintain the overall compactness of the screwdriver in the height direction.

[0110] Combination Figures 1 to 3 In the illustrated embodiment, a top plate 16 is also connected to the mounting plate 13. A sealing ring, sealing ring or sealing strip may also be provided between the top plate and the mounting plate 13 to enclose the stator disk 62 of the encoder assembly between the mounting plate 13 and the top plate 16.

[0111] Combination Figure 2 , Figures 22 to 24 In the preferred embodiment of the rotary machine shown, the reducer assembly includes a first-stage planetary reducer 3, wherein the first sun gear 31, the first ring gear 34 and the plurality of first planet gears 33 of the first-stage planetary reducer 3 are all located within the axial height range of the outer stator 21 of the motor 2.

[0112] Thus, in the vertical direction, the total height of motor 2 and first-stage planetary reducer 3 is basically equivalent to the total height of motor 2, which helps to shorten the overall height of the turning host.

[0113] Combination Figure 19 and Figure 20In the preferred embodiment of the rotating main unit shown, the first sun gear 31 is provided with a first shaft portion 311, a first gear portion 312, and a first shaft disk portion 313. The first gear portion 312 and the first shaft disk portion 313 are coaxially connected to the outer wall of the first shaft portion 311. The diameter of the first gear portion 312 is smaller than the diameter of the first shaft disk portion 313. The bottom of the rotating shaft 2233 of the motor 2 has a mounting hole 22331. The first shaft portion 311 extends into the mounting hole 22331 and is keyed in place. The bottom end face of the rotating shaft 2233 is bolted to the first shaft disk portion 313 of the first sun gear 31.

[0114] Thus, the first sun gear 31 is connected to the bottom end face of the rotating shaft 2233 of the motor 2 via its own first shaft disc portion 313. This connection method helps to shorten the axial dimension required for the connection. The diameter of the first gear portion 312 is smaller than the diameter of the first shaft disc portion 313. The larger diameter of the first shaft disc portion 313 helps to form a larger connection area with the rotating shaft 2233 of the motor 2, making the connection more reliable. At the same time, the smaller diameter of the first gear portion 312 of the first sun gear 31 helps to make the overall size of the first-stage planetary reducer 3 smaller, and also helps the first-stage planetary reducer 3 to have a larger transmission ratio.

[0115] Combination Figure 2 and Figures 25 to 30 In a preferred embodiment of the shown rotary head, the reducer assembly includes a first-stage planetary reducer 3 and a second-stage planetary reducer 4. The second-stage planetary reducer 4 includes a second sun gear 41 and a second planet carrier 42, with the second sun gear 41 located within the axial height range of the second planet carrier 42. Furthermore, the axial bottom end of the first planet carrier 32 of the first-stage planetary reducer 3 extends into the top end of the second planet carrier 42, a fifth bearing 85 is provided between the axial bottom end of the first planet carrier 32 and the top end of the second planet carrier 42, and the axial bottom end of the first planet carrier 32 is connected to the top end of the second sun gear 41.

[0116] Thus, the bottom axial end of the first planetary carrier 32 extends into the top of the second planetary carrier 42 and connects with the top of the second sun gear 41, so that the connection between the first-stage planetary reducer 3 and the second-stage planetary reducer 4 does not require additional axial dimensions, which helps to maintain the compactness of the turning machine in the axial or height direction.

[0117] Continue to refer to Figure 27In the preferred embodiment of the rotating main unit shown, the second sun gear 41 is provided with a second shaft portion 411 and a second gear portion 312 and a second shaft disk portion 413 coaxially connected to the second shaft portion 411. The diameter of the second gear portion 312 is smaller than the diameter of the second shaft disk portion 413. A hexagonal shaft hole 322 is formed at the axial bottom end of the first planetary carrier 32. The hexagonal shaft head 4111 of the second shaft portion 411 extends into the hexagonal shaft hole 322 for a limiting fit, and the second shaft disk portion 413 of the second sun gear 41 is bolted to the bottom end face of the first planetary carrier 32.

[0118] Thus, the second sun gear 41 is connected to the bottom end face of the shaft 2233 of the first planetary carrier 32 via its own second shaft disk portion 413. This connection method helps to shorten the axial dimension required for the connection. The diameter of the second gear portion 312 is smaller than the diameter of the second shaft disk portion 413. The larger diameter of the second shaft disk portion 413 helps to form a larger connection area between the second sun gear 41 and the first planetary carrier 32, making the connection more reliable. At the same time, the smaller diameter of the second gear portion 312 of the second sun gear 41 helps to make the overall size of the two-stage planetary reducer 4 smaller, and also helps the two-stage planetary reducer 4 to have a larger transmission ratio.

[0119] Example 3

[0120] Combination Figure 1 , Figure 2 The rotating main unit shown includes a housing assembly 1, a motor 2, a reducer assembly, a first transmission gear 51, and a second transmission gear 52. The housing assembly 1 includes a main housing 11 and a base plate 12. The main housing 11 has a first mounting cavity 111 and a second mounting cavity 112 with parallel axes. The portion of the base plate 12 corresponding to the second mounting cavity 112 is connected to the bottom end of the main housing 11. The motor 2 is mounted at the top axial direction of the first mounting cavity 111, and a receiving space 201 is formed on the inner side of the bottom axial direction of the motor 2.

[0121] The reducer assembly is located in the first mounting cavity 111 and includes a first-stage planetary reducer 3 and a second-stage planetary reducer 4. The first-stage planetary reducer 3 extends into the receiving space 201 of the motor 2 and is connected to the rotating shaft 2233 of the motor 2. The axial top end of the first transmission gear 51 is connected to the output side of the second-stage planetary reducer 4, and its axial bottom end is rotatably mounted on the base plate 12. The second transmission gear 52 is installed between the second mounting cavity 112 and the base plate 12, meshes with the first transmission gear 51, and is larger than the diameter of the first transmission gear 51. The second transmission gear 52 has a connecting portion 521 with a screw head in its axial direction.

[0122] When the aforementioned screw-tightening machine is operating, after the motor 2 outputs power, the speed is first reduced and the torque is increased twice through the first-stage planetary reducer 3 and the second-stage planetary reducer 4. Then, the speed is further reduced and the torque is increased a third time through the meshing of the first transmission gear 51 and the second transmission gear 52, ultimately ensuring that the output speed and torque meet the requirements for screw tightening. Since there is no need for a separate transmission device to change the transmission direction, the size of the screw-tightening machine is greatly reduced. Simultaneously, setting the screw-tightening head parallel to the axis of the motor 2 also helps to shorten the overall height of the screw-tightening machine after the screw-tightening head is installed. Furthermore, the accommodating space 201 formed by the first-stage planetary reducer 3 extending into the axial bottom of the motor 2 helps to shorten the overall axial dimension of the screw-tightening machine.

[0123] Combination Figure 4 , Figure 13 , Figure 21 , Figure 24 and Figure 25 In a preferred embodiment of the rotating main unit shown, the rotating main unit further includes a mounting plate 13 and a first bearing 81. The outer edge of the mounting plate 13 is connected to the outer top wall of the main housing 11 surrounding the first mounting cavity 111, and the middle portion of the mounting plate 13 is recessed towards the first mounting cavity 111 to form a recessed step portion 131. A bearing mounting groove 132 is formed on the bottom side of the recessed step portion 131, facing the rotating shaft 2233 of the motor 2. The first bearing 81 is mounted in the bearing mounting groove 132, and its inner ring is connected to the upper part of the rotating shaft 2233 of the motor 2. Figure 22 The top of the rotating shaft 2233 of the motor 2 is located within the height range of the top side of the outer stator 21. In this way, by combining the shorter rotating shaft 2233 of the motor 2 with the recessed step portion 131 of the mounting plate 13, the rotational support connection between the motor 2 and the housing assembly 1 is achieved, which helps to shorten the overall axial dimension of the screwdriver.

[0124] Combination Figure 3 , Figure 11 , Figure 22 and Figure 23 In the preferred embodiment of the rotating main unit shown, the main housing 11 has an annular groove 113 formed in the upper part of the first mounting cavity 111. The annular groove 113 is surrounded by the circumferential inner wall of the first mounting cavity 111, an annular bottom wall and an inner annular wall 1131. The motor 2 is installed in the annular groove 113, and the rotating shaft 2233 of the motor 2 is exposed to the top opening 1132 of the inner annular wall 1131.

[0125] Combination Figure 19 and Figure 20 as well as Figures 23 to 27In the preferred embodiment of the rotary head shown, the first-stage planetary reducer 3 extends into the inner side of the inner ring wall 1131 toward the top opening 1132, and the first-stage planetary reducer 3 includes a first sun gear 31, a first planet carrier 32, and a plurality of first planet gears 33. The first sun gear 31 is provided with a first shaft portion 311 and a first gear portion 312 and a first shaft disk portion 313 coaxially connected to the outer wall of the first shaft portion 311.

[0126] The first shaft portion 311 extends into the mounting hole 22331 of the rotating shaft 2233 and is connected by a key, while the first shaft disc portion 313 is connected to the bottom end face of the rotating shaft 2233 by bolts. In this way, the first sun gear 31 is connected to the bottom end face of the rotating shaft 2233 of the motor 2 through its own first shaft disc portion 313. This connection method helps to shorten the axial dimension required for the connection.

[0127] Combination Figure 28 and 29 A second bearing 82 is provided between the inner wall of the input end of the first planetary carrier 32 and the outer circumferential wall of the inner end of the rotating shaft 2233 of the motor 2. A third bearing 83 is provided between the outer circumferential wall of the input end of the first planetary carrier 32 and the inner circumferential wall 1131 of the annular groove 113.

[0128] Thus, the input end of the first planetary carrier 32 is supported by bearings on both the inner and outer sides, making the rotational connection of the first planetary carrier 32 more reliable and stable.

[0129] Furthermore, a fourth bearing 84 is provided between the lower inner wall of the first planetary carrier 32 and the lower outer wall of the first shaft portion 311 of the first sun gear 31. A plurality of first planetary gears 33 are spaced apart and rotatably mounted on the first planetary carrier 32, meshing with the first gear portion 312 of the first sun gear 31. The internal teeth of the first gear ring 34 mesh with the plurality of first planetary gears 33.

[0130] Thus, the first-stage planetary reducer 3 receives power from the first sun gear 31. When the first sun gear 31 rotates, it drives multiple first planet gears 33 to rotate on their own. Furthermore, the first planet gears 33 revolve around the first ring gear 34 under the support and connection of the first planet carrier 32, thereby achieving a large reduction ratio.

[0131] Combination Figure 29 In a preferred embodiment of the shown screwdriver, the screwdriver further includes a first pressure ring 91 connected to the input end of the first planetary carrier 32 to press the outer ring of the second bearing 82 against the support limiting platform 321 on the side wall of the first planetary carrier 32. This allows the second bearing 82 to be connected to the first planetary carrier 32, enabling a rotatable connection between the input end of the first planetary carrier 32 and the rotating shaft 2233 of the motor 2 via the second bearing 82.

[0132] Combination Figure 23 , Figure 25 and Figure 29 In the preferred embodiment of the screwdriver shown, a first radial annular groove 1133 is provided on the inner circumferential side of the inner annular wall 1131 of the annular groove 113, and an annular boss 1134 is also formed on the inner circumferential side of the inner annular wall 1131, with the annular boss 1134 located below the first radial annular groove 1133. A third bearing 83 is supported on the top side of the annular boss 1134, and a first gear ring 34 is supported on the bottom side of the annular boss 1134. An open pressure ring 92 is provided in the first radial annular groove 1133, and the edge of the open pressure ring 92 presses against the outer ring of the third bearing 83. Thus, the outer ring of the third bearing 83 is pressed between the open pressure ring 92 and the annular boss 1134, thereby connecting the third bearing 83 to the main housing 11.

[0133] Combination Figure 25 , Figure 28 , Figure 29 and Figure 32 In a preferred embodiment of the screwdriver shown, the screwdriver further includes a second pressure ring 93. The second pressure ring 93 is provided with a retaining ring 931 and a pressure ring portion 932 formed by axially protruding from the inner side of the retaining ring 931. The top end of the pressure ring portion 932 presses against the bottom end of the first toothed ring 34, and the retaining ring 931 is connected to the bottom inner side of the inner ring wall 1131 of the main housing 11. Thus, through the connection between the second pressure ring 93 and the main housing 11, the second pressure ring 93 is assembled onto the main housing 11 and presses against the bottom end of the first toothed ring 34.

[0134] Combination Figure 2 , Figure 10 , Figure 18 , Figure 27 , Figures 30 to 33 In a preferred embodiment of the rotary head shown, the secondary planetary reducer 4 of the rotary head includes a second sun gear 41, a second planet carrier 42, a plurality of second planet gears 43, and a second ring gear 44.

[0135] The top of the second sun gear 41 is connected to the bottom of the first planetary carrier 32. A fifth bearing 85 is provided between the upper inner circumferential wall of the second planetary carrier 42 and the lower outer circumferential wall of the first planetary carrier 32 to realize the rotational support connection between the second planetary carrier 42 and the first planetary carrier 32.

[0136] Furthermore, a sixth bearing 86 is provided between the lower inner circumferential wall of the second planetary carrier 42 and the lower outer circumferential wall of the second sun gear 41 to realize the rotational support connection between the second planetary carrier 42 and the second sun gear 41.

[0137] Multiple second planetary gears 43 are spaced apart and rotatably mounted on the second planetary carrier 42, and mesh with the second gear portion 312 of the second sun gear 41. The internal teeth of the second gear ring 44 mesh with the multiple second planetary gears 43, and it is supported in the second axial annular groove 114 at the bottom end of the main housing 11.

[0138] The diameter of the second planetary carrier 42 is smaller than that of the motor 2, and the diameter of the second gear ring 44 is larger than that of the motor 2. This is beneficial to maintain the small radial dimension of the second-stage planetary reducer 4 while enabling the second-stage planetary reducer 4 to have a large reduction ratio.

[0139] Combination Figure 3 , Figure 4 , Figure 9 , Figure 10 , Figure 18 , Figure 25 , Figures 29 to 34 In a preferred embodiment of the screwdriver shown, the screwdriver further includes a seventh bearing 87, a third pressure ring 94, a first pressure plate 14, and a second pressure plate 15. The inner ring of the seventh bearing 87 is connected to the circumferential outer wall of the lower part of the second planetary carrier 42. The third pressure ring 94 is connected to the bottom end of the second planetary carrier 42 and presses the inner ring of the seventh bearing 87 against the first annular step 421 on the outer wall of the second planetary carrier 42. Thus, the seventh bearing 87 is fixed to the second planetary carrier 42 by the third pressure ring 94.

[0140] Furthermore, the outer edge of the first pressure plate 14 is disposed at the bottom end of the main housing 11 along the first mounting cavity 111 to fix the second gear ring 44 to the bottom of the main housing 11. The first pressure plate 14 has a central circular hole 141, and the inner wall of the central circular hole 141 has a second annular step 1411 facing away from the second gear ring 44. The top of the outer ring of the seventh bearing 87 is supported on the second annular step 1411. The top of the second pressure plate 15 has an annular groove 151 for the seventh bearing 87 and the third pressure ring 94 to be inserted into, so that the seventh bearing 87 is connected to the housing assembly 1, and a rotational connection is achieved between the second planetary carrier 42 and the housing assembly 1.

[0141] In a further preferred embodiment, the inner wall of the central hole of the second pressure plate 15 is further provided with a second radial annular groove 152, and the screwdriver also includes a sealing ring 95. The sealing ring 95 is disposed in the second radial annular groove 152, and the inner circumferential wall of the sealing ring 95 rotates and seals with the outer circumferential wall of the bottom of the second planetary carrier 42, thereby achieving a rotationally sealed connection between the second planetary carrier 42 and the housing assembly 1, preventing rainwater or dust from entering the first mounting cavity 111 through the gap between the secondary planetary reducer 4 and the housing assembly 1. Furthermore, the axial top end of the first transmission gear 51 is connected to the bottom end of the second planetary carrier 42. Thus, the reducer assembly transmits power to the first transmission gear 51 after two stages of reduction.

[0142] It should be noted that although this embodiment uses a two-stage planetary reducer as an example, unless otherwise specified, the reducer assembly can also be a harmonic reducer or an RV reducer, and is not limited to a two-stage reducer; it can also be a single-stage reducer. Furthermore, although this embodiment uses... Figures 19 to 22 The example shown is a frameless internal rotor motor, but other types of motors, such as coreless motors or other DC or AC motors, can be selected unless there are special requirements or restrictions.

[0143] It should be understood that although this specification is described according to various embodiments, not every embodiment or implementation method contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

[0144] The above descriptions are merely illustrative embodiments of this application and are not intended to limit the scope of the embodiments of this application. Any equivalent changes, modifications, and combinations made by those skilled in the art without departing from the concept and principles of the embodiments of this application should fall within the protection scope of the embodiments of this application.

Claims

1. A screwdriver main unit, characterized in that, include: Motor (2); A speed reducer assembly connected to the output end of the motor (2); The first transmission gear (51) is connected to the output end of the reducer assembly; The second transmission gear (52) meshes with the first transmission gear (51) and has a diameter larger than that of the first transmission gear (51), and the second transmission gear (52) has a connecting part (521) with a screw head in the axial direction. The motor (2), reducer assembly and first transmission gear (51) are arranged along the first axis, and the second transmission gear (52) is arranged on the second axis parallel to the first axis, and the second transmission gear (52) meshes with the first transmission gear (51); The drive box (7) contains a driver (71), and the driver (71) is connected to the motor (2) via a cable.

2. The screwdriver as described in claim 1, characterized in that, The housing assembly (1) of the rotary machine includes: The main housing (11) has a first mounting cavity (111) and a second mounting cavity (112), the first mounting cavity (111) being disposed along the first axis and the second mounting cavity (112) being disposed along the second axis; The base plate (12), the portion of which corresponds to the second mounting cavity (112), is connected to the bottom end of the main housing (11); The motor (2) and reducer assembly are installed in the first mounting cavity (111), the first transmission gear (51) is disposed on the base plate (12) and faces the first mounting cavity (111), and the second transmission gear (52) is installed between the second mounting cavity (112) and the base plate (12).

3. The screwdriver as described in claim 2, characterized in that, Also includes: The ninth bearing (89) has its inner ring connected to the upper part of the main shaft of the second transmission gear (52). The upper inner side of the main housing (11) forms a second annular mounting platform (115) around the second mounting cavity (112). The ninth bearing (89) is supported on the second annular mounting platform (115). The fourth pressure ring (96) has its outer edge connected to the main housing (11), and its bottom has a convex ring (962) that presses against the outer ring of the ninth bearing (89). The inner wall of its top has a fourth annular mounting platform (961), and a through hole (963) is formed in the middle of the fourth annular mounting platform (961) for the upper part of the second transmission gear (52) to pass through.

4. The screwing main unit according to claim 3, characterized in that, Also includes: The first sealing ring (97) is supported on the fourth annular mounting platform (961), and its inner circumferential sidewall is sealed to the outer circumferential sidewall of the upper part of the second transmission gear (52).

5. The screwdriver as described in claim 2, characterized in that, Also includes: The tenth bearing (810) has its inner ring connected to the lower part of the main shaft of the second transmission gear (52). A third annular mounting platform (121) is formed on the base plate (12), and the tenth bearing (810) is supported on the third annular mounting platform (121).

6. The screwing main unit according to claim 5, characterized in that, Also includes: The second sealing ring (98) has its inner circumferential sidewall sealed to the sidewall of the lower part of the main shaft of the second transmission gear (52). The base plate (12) has a third radial annular groove (122) formed below the third annular mounting platform (121). The second sealing ring (98) is disposed in the third radial annular groove (122).

7. The screwdriver as described in claim 2, characterized in that, The second transmission gear (52) is provided with a shaft sleeve (522), an external gear disk (523) and an inner connecting disk (524). The external gear disk (523) is coaxially disposed on the outer side wall of the shaft sleeve (522), and the inner connecting disk (524) is coaxially disposed on the inner side wall of the shaft sleeve (522). The inner connecting disk (524) is provided with a water leakage hole (5241) and a connecting hole (5242) that mates with the screw head. The base plate (12) has a through hole (123) that is adapted to the outer diameter of the shaft cylinder (522), and the lower section of the shaft cylinder (522) extends to the through hole (123).

8. The screwdriver as described in claim 2, characterized in that, Also includes: The eighth bearing (88) has its inner ring connected to the circumferential outer wall of the axial bottom end of the first transmission gear (51). The inner wall of the base plate (12) corresponding to the first mounting cavity (111) is provided with a bearing support groove (124), and the eighth bearing (88) is disposed in the bearing support groove (124).

9. The screwing main unit according to claim 2, characterized in that, The drive box (7) is connected to the outer wall of the housing assembly (1) and close to the first mounting cavity (111); wherein, the drive box (7) has a closed-loop sealing groove (701) formed on the outer wall of the housing assembly (1) in close contact with it, and a sealing strip is provided in the closed-loop sealing groove (701), and the sealing strip is in close contact with the outer wall of the housing assembly (1). In addition, the drive box (7) is provided with screw holes (702) and cable through holes (703) connected to the housing assembly (1), and the screw holes (702) and cable through holes (703) are distributed inside the area enclosed by the closed-loop sealing groove (701) on the outer wall of the drive box (7).

10. The screwdriver as claimed in claim 1, characterized in that, A hexagonal mounting head (511) is formed at the axial top of the first transmission gear (51), and a hexagonal mounting hole (422) is formed at the bottom of the output end of the reducer assembly. The hexagonal mounting head (511) extends into the hexagonal mounting hole (422) for a limiting fit, and the wheel disc portion (512) of the first transmission gear (51) is bolted to the bottom end face of the output end of the reducer assembly.

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