CN224169738U - Rotary main unit - Google Patents

Abstract

This utility model belongs to the field of new energy battery swapping equipment technology, and specifically relates to a screw-tightening main unit for battery swapping equipment. The screw-tightening main unit includes a motor (2), a reducer assembly, a first transmission gear (51), a second transmission gear (52), and a drive box (7). When the screw-tightening main unit is working, the speed is first reduced and the torque is increased through the reducer assembly, and then the speed is further reduced and the torque is increased through the meshing transmission of the first transmission gear (51) and the second transmission gear (52), so that the output speed and torque meet the requirements of screw tightening. Since there is no need to set up a separate transmission device to change the transmission direction, the volume of the screw-tightening main unit is greatly reduced. At the same time, setting the screw-tightening head in a direction parallel to the axis of the motor (2) is also beneficial to shorten the overall height of the screw-tightening main unit after the screw-tightening head is installed, compared to setting the screw-tightening head directly on the extension line of the axis of the motor (2).

Description

Main machine for screwing

Technical Field

The utility model belongs to the technical field of new energy power conversion equipment, and particularly relates to a screwing host for power conversion equipment.

Background

The electric automobile power exchange station is used as a key facility for solving the problem of mileage anxiety, and the core of the electric automobile power exchange station is that a modular system is used for realizing the quick replacement of batteries. The electric automobile power exchanging process comprises the steps of lifting the automobile body, exposing the chassis battery pack, unlocking the chassis battery pack, replacing a new battery pack and putting down the automobile body. When the electric automobile is used for disassembling or assembling the battery, the screws are required to be rapidly rotated by utilizing a plurality of screw guns according to the position arrangement of the screw hole sites.

Chinese patent CN109483212B discloses a screwing tool for an automotive power exchanging device, which comprises a motor, a speed reducer and a screwing head, wherein the screwing tool is formed by splicing the motor and the speed reducer, and a staggered shaft transmission mechanism is further required to enable the motor and the speed reducer to be arranged at a certain angle with the screwing head, so that the whole occupied volume of the screwing tool is larger.

Disclosure of utility model

In view of this, the present utility model provides a screwing host, which aims to make the screwing host more compact and smaller.

The screwing host machine comprises a motor, a speed reducer assembly, a first transmission gear, a second transmission gear and a driving box. Wherein, the reduction gear subassembly is connected at the output of motor. The first transmission gear is connected to the output end of the speed reducer assembly. The second transmission gear is meshed with the first transmission gear for transmission and is larger than the diameter of the first transmission gear, and a connecting part of a screwing head is formed on the second transmission gear in the axial direction. Wherein, motor, reduction gear subassembly and first drive gear set up along the first axis, the second drive gear set up with the first axis is parallel on the second axis, and the second drive gear with first drive gear meshing. The inside of the driving box is provided with a driver, and the driver is connected with the motor through a cable.

When the screwing host works, the rotation speed and the torque are reduced through the speed reducer assembly and then further reduced through the meshing transmission of the first transmission gear and the second transmission gear along with the rotation of the drive motor of the drive box, and finally the output rotation speed and torque meet the requirement of screwing screws. The volume of the screwing host machine is greatly reduced because a transmission device for changing the transmission direction is not required to be arranged separately. Meanwhile, the screwing head is arranged in the direction parallel to the axis of the motor, and compared with the screwing head which is directly arranged on the axis extension line of the motor, the screw head is also beneficial to shortening the overall height of the screw host after the screw head is installed. In addition, the drive box isolates the driver from the motor, so that the mutual influence of the heat of the driver and the motor is avoided, and the overall heat dissipation effect of the screwing host is improved.

In a preferred embodiment of the screwing machine according to the present utility model, the housing assembly of the screwing machine includes a main housing and a bottom plate. Wherein the main housing is formed with a first mounting cavity and a second mounting cavity, the first mounting cavity being disposed along the first axis and the second mounting cavity being disposed along the second axis. The bottom plate is connected to the bottom end of the main shell at a part corresponding to the second installation cavity. The motor and speed reducer assembly is mounted to the first mounting cavity, the first transmission gear is arranged on the bottom plate and faces the first mounting cavity, and the second transmission gear is mounted between the second mounting cavity and the bottom plate.

In a preferred technical solution of the screwing host machine of the present utility model, the screwing host machine further includes a ninth bearing and a fourth pressing 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 table is formed around the second mounting cavity on the inner side of the upper part of the main shell, and the ninth bearing is supported and arranged on the second annular mounting table. And the outer edge of the fourth pressing ring is connected to the main shell, a convex ring for pressing the outer ring of the ninth bearing is formed at the bottom of the fourth pressing ring, a fourth annular mounting table is formed on the inner wall of the top of the fourth pressing ring, and a through hole for the upper part of the second transmission gear to pass through is formed in the middle of the fourth annular mounting table.

In a preferred technical scheme of the screwing host machine of the utility model, the screwing host machine further comprises a first sealing ring, wherein the first sealing ring is supported and arranged on the fourth annular mounting table, and the annular inner side wall of the first sealing ring is in sealing fit with the annular outer wall of the upper part of the second transmission gear.

In a preferable technical scheme of the screwing host machine of the utility model, the screwing host machine further comprises a tenth bearing, an inner ring of the tenth bearing is connected to the lower part of the main shaft of the second transmission gear, a third annular mounting table is formed on the bottom plate, and the tenth bearing is supported and arranged on the third annular mounting table.

In a preferred technical scheme of the screwing host machine of the utility model, the screwing host machine further comprises a second sealing ring, the annular inner side wall of the second sealing ring is in sealing fit with the side wall of the lower part of the second transmission gear spindle, a third radial annular groove is formed in the bottom plate below the third annular mounting table, and the second sealing ring is arranged in the third radial annular groove.

In a preferable technical scheme of the screwing host machine of the utility model, the second transmission gear is provided with a shaft barrel part, an external tooth disc part and an internal disc part, the external tooth disc part is coaxially arranged on the outer side wall of the shaft barrel part, the internal disc part is coaxially arranged on the inner side wall of the shaft barrel part, and the internal disc part is provided with a water leakage hole and a connecting hole matched with the screwing head. Wherein, the bottom plate is formed with the through-hole of the external diameter adaptation of axle section of thick bamboo portion, the hypomere of axle section of thick bamboo portion extends to this through-hole.

In a preferred technical scheme of the screwing host machine, the screwing host machine further comprises an eighth bearing, an inner ring of the eighth bearing is connected with an annular outer wall of the axial bottom end of the first transmission gear, a bearing supporting groove is formed in the inner wall of the portion, corresponding to the first mounting cavity, of the bottom plate, and the eighth bearing is arranged in the bearing supporting groove.

In a preferred embodiment of the screwing machine according to the present utility model, the driving box is connected to an outer wall of the housing assembly and is adjacent to the first mounting chamber. The driving box is tightly attached to the outer wall of the shell assembly, a closed-loop sealing groove is formed in the driving box, and a sealing strip is arranged in the closed-loop sealing groove and tightly attached to the outer wall of the shell assembly. And the driving box is provided with screw holes and cable perforations connected with the shell assembly, and the screw holes and the cable perforations are distributed in an area surrounded by the closed-loop sealing groove on the outer wall of the driving box.

In a preferable technical scheme of the screwing host machine of the utility model, 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 speed reducer assembly, the hexagonal mounting head stretches into the hexagonal mounting hole to be in limit fit, and the wheel disc part of the first transmission gear is connected to the bottom end face of the output end of the speed reducer assembly through a bolt.

Drawings

The above and other features and advantages of the present utility model will become more apparent to those of ordinary skill in the art by describing in detail preferred embodiments thereof with reference to the attached drawings in which:

fig. 1 is a schematic view of the external structure of a screwing host according to the present utility model.

Fig. 2 is an exploded view of the screwing main body of the present utility model.

Fig. 3 is a schematic view of an exploded structure of a housing assembly of a screwing host according to the present utility model from a top view.

Fig. 4 is a schematic view of an explosion structure of a housing assembly of a screwing host according to the present utility model from a bottom view.

Fig. 5 is a schematic structural view of a driving box of a screwing host machine according to the present utility model.

Fig. 6 is a schematic diagram of a connection structure between a first transmission gear and a second transmission gear of the screwing host machine and a main housing.

Fig. 7 is a schematic diagram of a connection structure between a first transmission gear and a second transmission gear of the screwing host and a bottom plate.

Fig. 8 is a schematic structural view of a base plate of a screwing host according to the present utility model.

Fig. 9 is a schematic diagram of a connection structure between a secondary planetary reducer of a screwing host machine and a main housing and a first pressing plate.

Fig. 10 is a schematic diagram of a connection structure between a second ring gear of the screwing main unit and a main housing of the present utility model.

Fig. 11 is a schematic diagram showing a connection structure between the top of the main housing of the screwing main machine and the primary planetary reducer.

Fig. 12 is a schematic diagram of a connection structure between the top of the main housing of the screwing host and the motor and the second transmission gear.

Fig. 13 is a schematic view showing a connection structure of the main housing of the screwing main machine, the mounting plate and the fourth clamping ring.

Fig. 14 is a schematic cross-sectional view of a screwing host corresponding to a second mounting cavity according to the present utility model.

Fig. 15 is a schematic diagram showing an assembly structure of a second transmission gear of the screwing host machine of the present utility model.

Fig. 16 is an exploded view of a second transmission gear of the screwing main unit of the present utility model.

Fig. 17 is a schematic diagram of a connection structure between a first transmission gear of a screwing host and a second planetary reducer of the present utility model.

Fig. 18 is a schematic structural assembly view of a secondary planetary reducer of a screwing main machine of the present utility model.

Fig. 19 is a schematic diagram showing a connection structure of a motor and a first sun gear of the screwing host machine of the present utility model.

Fig. 20 is a schematic view showing a bottom structure of a motor of a screwing host machine of the present utility model.

Fig. 21 is a schematic diagram of a top connection structure of a motor of a screwing host according to the present utility model.

Fig. 22 is a schematic diagram of the structure of the motor itself of the screwing host machine of the present utility model.

Fig. 23 is a schematic structural view of the main housing of the screwing host according to the present utility model corresponding to the first mounting cavity.

Fig. 24 is a schematic view showing a connection structure between a mounting plate of a screwing host and a first bearing.

Fig. 25 is a schematic cross-sectional view of a first mounting cavity of the screwing host according to the present utility model.

Fig. 26 is a schematic view showing the overall assembly structure of the motor, the decelerator assembly and the first transmission gear of the screwing main machine of the present utility model.

Fig. 27 is a first schematic view of the overall exploded construction of the motor, reducer assembly and first drive gear of the screw host machine of the present utility model.

Fig. 28 is a schematic diagram of a connection structure of a primary planetary reducer and a second sun gear of the screwing host machine of the present utility model.

Fig. 29 is a schematic view of a connection structure of a primary planetary reducer of a screwing main machine of the present utility model.

Fig. 30 is a schematic diagram of a connection structure of a secondary planetary reducer of a screwing main machine according to the present utility model.

Fig. 31 is a schematic diagram showing a connection structure between a secondary planetary reducer of a screwing main machine and a main casing of the present utility model.

Fig. 32 is a schematic view of the position structure of the primary planetary reducer of the screwing main machine in the main housing.

Fig. 33 is a second schematic view of the overall exploded construction of the motor, reducer assembly and first drive gear of the screw host machine of the present utility model.

Fig. 34 is a schematic structural view of a second pressing plate of the screwing host machine of the present utility model.

Wherein, the reference numerals are as follows:

1-a housing assembly;

11-a main housing, 111-a first mounting cavity, 112-a second mounting cavity, 113-an annular groove, 1131-an inner annular wall, 1132-a top opening, 1133-a first radial annular groove, 1134-an annular boss, 114-a second axial annular groove, 115-a second annular mounting land;

12-a bottom plate, 121-a third annular mounting table, 122-a third radial annular groove, 123-a through hole and 124-a bearing support groove;

13-mounting plates, 131-sinking step parts, 132-bearing mounting grooves and 133-middle openings;

14-a first pressing plate, 141-a middle round hole, 1411-a second annular step;

15-a second platen, 151-an annular groove, 152-a second radial annular groove;

16-top plate;

2-motor, 21-outer stator, 22-inner rotor, 221-magnetic steel, 222-iron core ring, 223-motor shaft, 2231-supporting ring, 2232-bracket, 2233-rotating shaft, 22331-mounting shaft hole and 22332-first annular mounting table;

201-accommodation space;

3-a primary planetary reducer;

31-first sun gear, 311-first shaft portion, 312-first gear portion, 313-first shaft disc portion;

32-a first planet carrier, 321-a supporting limiting table and 322-a hexagonal shaft hole;

33-first planet;

34—a first ring gear;

A 4-secondary planetary reducer;

41-a second sun gear, 411-a second shaft part, 4111-a hexagonal shaft head, 412-a second gear part, 413-a second shaft disc part;

42-second planet carrier, 421-first annular step, 422-hexagonal mounting hole;

43-a second planet;

44-a second ring gear;

51-first transmission gear, 511-hexagonal mounting head, 512-wheel disc part;

52-a second transmission gear, 521-a connecting part, 522-a shaft cylinder part, 523-an external gear part, 524-an internal gear part, 5241-a water leakage hole and 5242-a connecting hole;

61-rotor disk, 62-stator disk;

7-drive box, 701-closed-loop seal groove, 702-screw hole, 703-cable perforation, 71-drive;

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;

91-a first pressing ring, 92-an opening pressing ring, 93-a second pressing ring, 931-a fixed ring, 932-a pressing ring part, 94-a third pressing ring, 95-a sealing ring, 96-a fourth pressing ring, 961-a fourth annular mounting table, 962-a convex ring, 963-a through hole, 97-a first sealing ring and 98-a second sealing ring.

Detailed Description

The present utility model will be further described in detail with reference to the following examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent.

In the description of the present application, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present application and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application.

The screwing host machine provided in this embodiment is used in a power conversion device, for example, the power conversion device may include a lifting platform and a plurality of screwing host machines. The plurality of screwing hosts are arranged on the lifting table according to the position distribution of the screws for fixing the battery on the automobile. When the screwing host drives the screwing head to rotate, the screw for fixing the battery on the automobile is dismounted or mounted.

In one possible use scenario, the lift table is raised to be close to the bottom surface of the battery of the automobile, and the screwing host drives the screwing head to detach the screw so as to detach the original battery, and the lift table lifts the battery to descend together. After the new battery is placed on the lifting platform, the lifting platform is lifted again, the screwing host drives the screwing head to fasten the screw, and the new battery is installed on the automobile.

Example 1

In the embodiment shown in connection with fig. 1 to 16, the screwing machine comprises a motor 2, a reducer assembly, a first transfer gear 51, a second transfer gear 52 and a drive box 7. Wherein the first transfer gear 51 is connected to the output of the reducer assembly. The second transmission gear 52 is engaged with the first transmission gear 51 to be transmitted and larger than the diameter of the first transmission gear 51, and the second transmission gear 52 is formed with a connection portion 521 of a screwing head in the axial direction.

Wherein the motor 2, the reducer assembly and the first transfer gear 51 are arranged along a first axis, the second transfer gear 52 is arranged on a second axis parallel to the first axis, and the second transfer gear 52 is in mesh with the first transfer gear 51.

When the screwing host works, as the driver 71 in the driving box 7 drives the motor 2 to rotate, the rotation speed and the torque are reduced through the speed reducer assembly, then the rotation speed and the torque are further reduced through the meshing transmission of the first transmission gear 51 and the second transmission gear 52, and finally the output rotation speed and torque meet the requirement of screwing the screw. The volume of the screwing host machine is greatly reduced because a transmission device for changing the transmission direction is not required to be arranged separately. Meanwhile, the screwing head is arranged in the direction parallel to the axis of the motor 2, and compared with the screwing head which is directly arranged on the axis extension line of the motor 2, the screwing head is also beneficial to shortening the overall height of the screwing host after the screwing head is installed.

And, a driver 71 is provided inside the driving case 7, and the driver 71 is connected with the motor 2 through a cable. Wherein, the drive box 7 separates the drive 71 and the motor 2, is favorable to avoiding the mutual influence of the heat of the drive 71 and the motor 2, improves the whole radiating effect of the screwing host, and is convenient for maintaining the drive 71 in the drive box 7.

Referring to fig. 2 to 4, in a preferred embodiment of the above-described screwing host, the housing assembly 1 of the screwing host may include a main housing 11 and a bottom plate 12. Wherein the main housing 11 is formed with a first mounting chamber 111 and a second mounting chamber 112, the first mounting chamber 111 being arranged along a first axis and the second mounting chamber 112 being arranged along a second axis. The portion of the bottom plate 12 corresponding to the second mounting chamber 112 is connected to the bottom end of the main housing 11.

Wherein the motor 2 and the reducer assembly are mounted to 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 mounted between the second mounting cavity 112 and the base plate 12. In this way, the motor 2, the reduction gear 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.

With reference to fig. 1 and 5, the drive cassette 7 is attached to the outer wall of the housing assembly 1 adjacent to the first mounting cavity 111. Wherein, the outer wall of the shell assembly 1 is tightly clung to the driving box 7 and is formed with a closed-loop sealing groove 701, and a sealing strip is arranged in the closed-loop sealing groove 701 and is tightly clung to the outer wall of the shell assembly 1.

And, referring to fig. 5, the drive case 7 is provided with screw holes 702 and cable penetration holes 703 connected to the housing assembly 1, and the screw holes 702 and cable penetration holes 703 are distributed inside an area surrounded by the closed-loop seal groove 701 on the outer wall of the drive case 7. In this way, since the screw holes 702 and the cable penetration holes 703 between the driving case 7 and the housing assembly 1 are located in the area enclosed by the sealing strip, it is possible to avoid water from corroding the screws or entering the inside of the housing assembly 1 or the inside of the driving case 7 through the cable penetration holes 703.

In the preferred embodiment shown in connection with fig. 3 and 12 to 16, the screwing machine further includes a ninth bearing 89 and a fourth pressing ring 96, an inner ring of the ninth bearing 89 is connected to an upper portion of the main shaft of the second transmission gear 52, a second annular mounting table 115 is formed around the second mounting cavity 112 inside an upper portion of the main housing 11, and the ninth bearing 89 is supportingly provided on the second annular mounting table 115. The fourth presser 96 is attached to the main housing 11 at its outer edge, and is formed at its bottom with a convex ring 962 pressing against the outer race of the ninth bearing 89. In this way, a rotationally supported connection between one end of the second transfer gear 52 and the housing assembly 1 is achieved.

In the preferred embodiment shown in connection with fig. 13 and 16, a fourth annular mount 961 is formed in the top inner wall of the fourth press ring 96, and a through hole 963 is formed in the middle of the fourth annular mount 961 for passing the upper portion of the second transmission gear 52. The screwing host further comprises a first sealing ring 97, wherein the first sealing ring 97 is supported and arranged on a fourth annular mounting table 961, and the annular inner side wall of the first sealing ring is in sealing fit with the annular outer wall of the upper part of the second transmission gear 52. In this way, it is advantageous to prevent water or dust from entering the main casing 11 through the gap between the upper portion of the second transmission gear 52 and the main casing 11.

In the preferred embodiment of the screwing host machine shown in connection with fig. 3, 14 to 16, the screwing host machine further includes a tenth bearing 810, an inner ring of the tenth bearing 810 is connected to a lower portion of the main shaft of the second transmission gear 52, a third annular mounting table 121 is formed on the base plate 12, and the tenth bearing 810 is supportedly provided on the third annular mounting table 121. In this way, a rotationally supported connection between the spindle lower part of the second transmission gear 52 and the housing assembly 1 is achieved.

In the preferred embodiment of the screwing machine shown in connection with fig. 14 to 16, the screwing machine further comprises a second sealing ring 98, the annular inner side wall of the second sealing ring 98 being in sealing engagement with the side wall of the lower spindle portion of the second transmission gear 52, the bottom plate 12 being formed with a third radial annular groove 122 below a third annular mounting table 121, the second sealing ring 98 being arranged in the third radial annular groove 122. In this way, water or dust can be prevented from entering the second mounting chamber 112 from between the gap of the second transfer gear 52 and the bottom plate 12.

In the preferred embodiment of the screwing host shown in fig. 1 and 14 to 16, the second transmission gear 52 is provided with a shaft tube portion 522, an outer gear disc portion 523 and an inner gear disc portion 524, the outer gear disc portion 523 is coaxially disposed on the outer side wall of the shaft tube portion 522, the inner gear disc portion 524 is coaxially disposed on the inner side wall of the shaft tube portion 522, and the inner gear disc portion 524 is provided with a water leakage hole 5241 and a connection hole 5242 which are engaged with the screwing head. Wherein the bottom plate 12 is formed with a through hole 123 adapted to the outer diameter of the shaft tube portion 522, and the lower section of the shaft tube portion 522 extends to the through hole 123. So, on the basis of realizing that the second transmission gear 52 is connected and matched with the screwing head, the situation of rainy days can be adapted, rainwater or silt can be discharged through the water leakage hole 5241, and the screwing host is not influenced in rainy and snowy days.

In the preferred embodiment of the screwing machine shown in connection with fig. 8 to 10 and 17 and 18, the reducer assembly may comprise a primary planetary reducer 3 and a secondary planetary reducer 4. The axial top end of the first transmission gear 51 is formed with a hexagonal mounting head 511, the output end of the reducer assembly, for example, the bottom of the output end of the second planet carrier 42 of the secondary planetary reducer 4 is formed with a hexagonal mounting hole 422, the hexagonal mounting head 511 extends into the hexagonal mounting hole 422 to be in a limit fit, and the wheel disc portion 512 of the first transmission gear 51 is connected to the bottom end face of the output end of the reducer assembly through a bolt. In this way, the wheel portion 512 of the first transmission gear 51 is closely attached to the output end of the reducer assembly without a gap therebetween, which is advantageous for shortening the dimensions of the first transmission gear 51 and the reducer assembly in the axial direction.

In the preferred embodiment of the screwing machine shown in connection with fig. 6 to 8, the screwing machine further comprises an eighth bearing 88, an inner ring of the eighth bearing 88 is connected with an annular outer wall of an axial bottom end of the first transmission gear 51, an inner wall of a portion of the bottom plate 12 corresponding to the first mounting cavity 111 is provided with a bearing support groove 124, and the eighth bearing 88 is provided in the bearing support groove 124. In this way, a rotational connection of the first transmission gear 51 with respect to the housing assembly 1 is achieved.

Example 2

In the embodiment of the screwing machine shown in connection with fig. 1 and 2, the screwing machine comprises a housing assembly 1, a motor 2, a reducer assembly, a first transmission gear 51 and a second transmission gear 52. Wherein the main housing 11 of the housing assembly 1 is formed with a first mounting cavity 111 and a second mounting cavity 112 having parallel axes. The motor 2 is mounted on the top of the first mounting chamber 111 in the axial direction, and a receiving space 201 is formed inside the bottom of the motor 2 in the axial direction. The decelerator assembly is positioned in the first installation cavity 111, and an input side of the decelerator assembly is inserted into the accommodation space 201 of the motor 2 and coupled to the rotation shaft 2233 of the motor 2.

And, a first transfer gear 51 is connected to the output side of the reducer assembly. The second transmission gear 52 is installed in the second installation cavity 112, the second transmission gear 52 is engaged with the first transmission gear 51 and is larger than the diameter of the first transmission gear 51, and the second transmission gear 52 is formed with a connection portion 521 of a screw head in the axial direction.

Each screwing master can be provided with a drive box 7 for driving the motor 2, or all screwing masters can be connected by cables to a control cabinet in which a plurality of drive units are integrated, for example.

When the screwing host works, after the motor 2 outputs power, the rotating speed and the torque are reduced through the speed reducer assembly, then the rotating speed and the torque are further reduced through the 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 of screwing screws. The volume of the screwing host machine is greatly reduced because a transmission device for changing the transmission direction is not required to be arranged separately. Meanwhile, the screwing head is arranged in the direction parallel to the axis of the motor 2, and compared with the screwing head which is directly arranged on the axis extension line of the motor 2, the screwing head is also beneficial to shortening the overall height of the screwing host after the screwing head is installed. And, the input side of the reducer assembly stretches into the accommodating space 201 formed at the axial bottom of the motor 2, which is beneficial to shortening the axial dimension of the whole screwing host machine.

In the preferred embodiment of the screwing machine shown in connection with fig. 2 and 17 and 18, the reducer assembly comprises a primary planetary reducer 3 and a secondary planetary reducer 4. The axial top end of the first transmission gear 51 extends into the limiting hole of the axial bottom end of the second carrier 42 of the secondary planetary reducer 4, and the disk portion 512 of the first transmission gear 51 is connected to the end face of the axial bottom end of the second carrier 42 by a bolt. In this way, the disk portion 512 of the first transmission gear 51 is in close contact with the output end of the reducer assembly without a gap therebetween, which is advantageous in shortening the size of the reducer assembly of the first transmission gear 51 in the axial direction.

In the preferred embodiment of the screwing host machine shown in connection with fig. 19 to 22, the motor 2 includes an outer stator 21 and an inner rotor 22, the inner rotor 22 is located at the inner side of the outer stator 21, and a motor shaft 223 of the inner rotor 22 is formed with a support ring 2231, a bracket 2232 and a rotating shaft 2233, and the top end of the support ring 2231 is connected with the rotating shaft 2233 through the bracket 2232.

Illustratively, the inner rotor 22 is provided with a magnetic steel 221, a core ring 222, and a motor shaft 223 in order from outside to inside in the radial direction. Wherein the inner rotor 22 has an axial height smaller than that of the outer stator 21 and the rotating shaft 2233 of the motor 2 has an axial height smaller than that of the support ring 2231 to form the accommodation space 201 inside the axial bottom of the motor 2.

In this way, by reducing the size of the internal structure of the motor 2 itself, the accommodation space 201 into which the input side of the decelerator assembly is inserted is formed, whereby the axial size of the screwing main machine can be reduced.

In the preferred embodiment of the screwing machine shown in connection with fig. 3, 11, 22 and 23, an annular groove 113 is formed in the upper portion of the first mounting chamber 111 of the main housing 11, the annular groove 113 being defined by the annular inner wall, annular bottom wall and inner annular wall 1131 of the first mounting chamber 111, the annular groove 113 being provided with the outer stator 21 and the support ring 2231 of the motor 2. For example, the magnetic steel 221, the core ring 222, and the support ring 2231 of the outer stator 21 and the inner rotor 22 of the motor 2 may all be disposed in the annular groove 113. In this way, the motor 2 is supportingly disposed in the annular recess 113 of the main housing 11. And, the reducer assembly is connected to the shaft 2233 of the motor 2 through the top opening 1132 of the inner annular wall 1131.

In the preferred embodiment of the screwing host shown in connection with fig. 13 and 21 to 25, the screwing host further comprises a mounting plate 13 and a first bearing 81, an outer edge of the mounting plate 13 is connected to an outer top wall of the main housing 11 surrounding the first mounting cavity 111, and a middle portion of the mounting plate 13 is recessed toward the first mounting cavity 111 to form a sinking step 131, and at least a portion of a bottom end of the sinking step 131 extends into a top side of the outer stator 21 of the motor 2. And, the sinking step 131 is further provided with a central opening 133 facing the rotation shaft 2233 of the motor 2, and the bottom side of the mounting plate 13 is formed with a bearing mounting groove 132 surrounding the central opening 133. The first bearing 81 is disposed in the bearing mounting groove 132, and an inner ring of the first bearing 81 is coupled to the rotating shaft 2233 of the motor 2. Wherein the top of the rotating shaft 2233 of the motor 2 in fig. 22 is located inside the top side height range of the outer stator 21. In this way, the motor 2 is connected with the rotation support of the housing assembly 1 by matching the shorter rotating shaft 2233 of the motor 2 with the sinking step portion 131 of the mounting plate 13, which is beneficial to shortening the overall axial dimension of the screwing host.

In the preferred embodiment of the screwing host shown in connection with fig. 12 and 13, the screwing host further comprises an encoder assembly comprising a rotor disc 61 and a stator disc 62. The encoder assembly may be selected as a magnetic encoder or an inductive encoder. For example, when the encoder assembly is a magnetic encoder, the rotor disk 61 may be selected to be a magnetic ring. The rotor disk 61 may be mounted on a first annular mounting table 22332 at the top end of the rotating shaft 2233 of the motor 2 and not axially beyond the top side of the outer stator 21 of the motor 2, which is axially closer to the top wall of the mounting plate 13 than the first bearing 81. The stator plate 62 is attached to the outer top wall of the mounting plate 13 and faces the rotor plate 61.

In this way, after the mounting plate 13 forms the sinking step 131, the mounting plate 13 forms the accommodation space 201 of the stator plate 62 just on the top thereof. The mounting structure of the encoder assembly of the present embodiment is also advantageous in maintaining compactness of the entire screw-on main body in the height direction.

In connection with the embodiment shown in fig. 1 to 3, a top plate 16 is also connected to the mounting plate 13, and 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 plate 62 of the encoder assembly between the mounting plate 13 and the top plate 16.

In the preferred embodiment of the screwing machine shown in connection with fig. 2, 22 to 24, the reducer assembly comprises a primary planetary reducer 3, the first sun gear 31, the first ring gear 34 and the plurality of first planet gears 33 of the primary planetary reducer 3 being located within the axial height of the outer stator 21 of the electric machine 2.

In this way, the overall height of the motor 2 and the primary planetary reducer 3 in the height direction is substantially equivalent to the overall height of the motor 2, which is advantageous in shortening the overall height dimension of the screwing machine.

In the preferred embodiment of the screwing machine shown in fig. 19 and 20, the first sun gear 31 is provided with a first shaft portion 311, a first gear portion 312, and a first shaft portion 313, and the first gear portion 312 and the first shaft portion 313 are coaxially connected to the outer wall of the first shaft portion 311. Wherein the diameter of the first gear portion 312 is smaller than the diameter of the first shaft disc portion 313. Wherein, a mounting shaft hole 22331 is formed at the bottom of the rotating shaft 2233 of the motor 2, the first shaft portion 311 is inserted into the mounting shaft hole 22331 and is engaged in a key connection manner, and the bottom end surface of the rotating shaft 2233 is connected with the first shaft disc portion 313 of the first sun gear 31 through a bolt.

In this way, the first sun gear 31 is connected to the bottom end surface of the rotating shaft 2233 of the motor 2 through its own first shaft disk portion 313, which is advantageous in shortening the dimension in the axial direction required for connection. The diameter of the first gear portion 312 is smaller than that of the first shaft disc portion 313, and the larger diameter of the first shaft disc portion 313 is advantageous in forming a larger connection area with the rotating shaft 2233 of the motor 2, so that connection is more reliable. Meanwhile, the smaller diameter of the first gear portion 312 of the first sun gear 31 is beneficial to making the overall size of the primary planetary reducer 3 smaller, and is beneficial to making the primary planetary reducer 3 have a larger transmission ratio.

In the preferred embodiment of the screwing machine shown in connection with fig. 2 and 25 to 30, in which the reducer assembly comprises a primary planetary reducer 3 and a secondary planetary reducer 4, the secondary planetary reducer 4 comprises a second sun gear 41 and a second planet carrier 42, and the second sun gear 41 is within the axial height of the second planet carrier 42. And, the axial bottom end of the first planet carrier 32 of the primary 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 with the top of the second sun gear 41.

In this way, the axial bottom end of the first planet carrier 32 extends into the top end of the second planet carrier 42 and is connected with the top of the second sun gear 41, so that the connection between the primary planetary reducer 3 and the secondary planetary reducer 4 does not need to occupy an additional axial dimension, which is beneficial to keeping the compactness of the screwing host in the axial direction or the height direction.

With continued reference to the preferred embodiment of the screwing host shown in fig. 27, the second sun gear 41 is provided with a second shaft portion 411 and a second gear portion 312 and a second shaft disc portion 413 coaxially connected to the second shaft portion 411. Wherein the diameter of the second gear portion 312 is smaller than the diameter of the second shaft disc portion 413. The axial bottom end of the first planet carrier 32 is formed with a hexagonal shaft hole 322, a hexagonal shaft head 4111 of the second shaft portion 411 extends into the hexagonal shaft hole 322 to be in a limit fit, and the second shaft disc portion 413 of the second sun gear 41 is connected with the bottom end surface of the first planet carrier 32 through a bolt.

In this way, the second sun gear 41 is connected to the bottom end surface of the rotating shaft 2233 of the first carrier 32 by its own second shaft disk portion 413, which is advantageous in shortening the dimension in the axial direction required for connection. The diameter of the second gear portion 312 is smaller than the diameter of the second shaft disc portion 413, and the larger diameter of the second shaft disc portion 413 is advantageous for forming a larger connection area between the second sun gear 41 and the first carrier 32, so that connection is more reliable. Meanwhile, the smaller diameter of the second gear portion 312 of the second sun gear 41 is beneficial to making the overall size of the secondary planetary reducer 4 smaller, and is beneficial to making the secondary planetary reducer 4 have a larger transmission ratio.

Example 3

In the screwing machine shown in connection with fig. 1, 2, the screwing machine comprises 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 comprises a main housing 11 and a bottom plate 12, wherein the main housing 11 is provided with a first mounting cavity 111 and a second mounting cavity 112 which are parallel in axis, and a part of the bottom 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 on the top of the first mounting chamber 111 in the axial direction, and a receiving space 201 is formed inside the bottom of the motor 2 in the axial direction.

The reducer assembly is located in the first installation cavity 111, and includes a primary planetary reducer 3 and a secondary planetary reducer 4, and the primary planetary reducer 3 extends into the accommodating space 201 of the motor 2 and is connected to the rotating shaft 2233 of the motor 2. The first transmission gear 51 has an axial top end connected to the output side of the secondary planetary reducer 4 and an axial bottom end rotatably provided on the bottom plate 12. The second transmission gear 52 is installed between the second installation cavity 112 and the base plate 12, and is engaged with the first transmission gear 51 and is larger than the diameter of the first transmission gear 51, and the second transmission gear 52 is formed with a connection portion 521 of a screw head in an axial direction thereof.

When the screwing host works, after the motor 2 outputs power, the rotating speed and the torque are reduced for the second time through the primary planetary reducer 3 and the secondary planetary reducer 4, then the rotating speed and the torque are further reduced through the meshing transmission of the first transmission gear 51 and the second transmission gear 52 for the third time, and finally the output rotating speed and torque meet the requirement of screwing the screw. The volume of the screwing host machine is greatly reduced because a transmission device for changing the transmission direction is not required to be arranged separately. Meanwhile, the screwing head is arranged in the direction parallel to the axis of the motor 2, so that the overall height of the screwing host after the screwing head is installed is also facilitated to be shortened. And, the primary planetary reducer 3 stretches into the accommodating space 201 formed at the axial bottom of the motor 2, which is beneficial to shortening the axial dimension of the whole screwing host machine.

In a preferred embodiment of the screwing host shown in connection with fig. 4, 13, 21, 24 and 25, the screwing host further comprises a mounting plate 13 and a first bearing 81. Wherein the outer edge of the mounting plate 13 is connected to the outer top wall of the main housing 11 surrounding the first mounting chamber 111, and the middle part of the mounting plate 13 is recessed toward the first mounting chamber 111 to form a sinking step part 131, and the bottom side of the sinking step part 131 is formed with a bearing mounting groove 132 facing the rotating shaft 2233 of the motor 2. The first bearing 81 is mounted in the bearing mounting groove 132 with its inner race coupled to an upper portion of the rotating shaft 2233 of the motor 2. Wherein the top of the rotating shaft 2233 of the motor 2 in fig. 22 is located inside the top side height range of the outer stator 21. In this way, the shorter rotating shaft 2233 of the motor 2 is combined with the sinking step portion 131 of the mounting plate 13, so that the motor 2 is rotatably supported and connected with the housing assembly 1, and the whole axial dimension of the screwing host machine is shortened.

In the preferred embodiment of the screwing main machine shown in connection with fig. 3, 11, 22 and 23, the main housing 11 is formed with an annular groove 113 at an upper portion of the first mounting chamber 111, the annular groove 113 is defined by an annular inner wall, an annular bottom wall and an inner annular wall 1131 of the first mounting chamber 111, the motor 2 is mounted in the annular groove 113, and a rotation shaft 2233 of the motor 2 is exposed to a top opening 1132 of the inner annular wall 1131.

In the preferred embodiment of the screwing machine shown in connection with fig. 19 and 20 and fig. 23 to 27, the primary planetary reducer 3 protrudes inside the inner annular wall 1131 toward the top opening 1132, and the primary planetary reducer 3 includes the first sun gear 31, the first carrier 32 and the plurality of first planetary 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 disc portion 313 coaxially connected to an outer wall of the first shaft portion 311.

The first shaft portion 311 extends into the mounting shaft hole 22331 of the rotating shaft 2233 and is connected in a key connection manner, and the first shaft disc portion 313 is connected with the bottom end surface of the rotating shaft 2233 by a bolt. In this way, the first sun gear 31 is connected to the bottom end surface of the rotating shaft 2233 of the motor 2 through its own first shaft disk portion 313, which is advantageous in shortening the dimension in the axial direction required for connection.

With reference to fig. 28 and 29, a second bearing 82 is provided between the inner side wall of the input end of the first carrier 32 and the annular outer side wall of the inner end of the rotary shaft 2233 of the motor 2. Wherein a third bearing 83 is arranged between the outer side wall of the input end of the first planet carrier 32 and the annular inner side wall of the inner annular wall 1131 of the annular groove 113.

In this way, the inner and outer sides of the input end of the first planet carrier 32 are bearing-supported, so that the rotational connection of the first planet carrier 32 is more reliable and stable.

And a fourth bearing 84 is provided between the inner side wall of the lower section of the first carrier 32 and the outer side wall of the lower section of the first shaft portion 311 of the first sun gear 31. The plurality of first planetary gears 33 are disposed on the first carrier 32 at intervals and rotatably engaged with the first gear portion 312 of the first sun gear 31. The inner teeth of the first ring gear 34 mesh with the plurality of first planetary gears 33.

In this way, the primary planetary reducer 3 is powered by the first sun gear 31, the first sun gear 31 drives the plurality of first planetary gears 33 to rotate, and the first planetary gears 33 revolve around the first gear ring 34 under the supporting connection of the first planet carrier 32, so that a larger reduction ratio is realized.

In the preferred embodiment of the screwing host shown in connection with fig. 29, the screwing host further comprises a first pressing ring 91, the first pressing ring 91 being connected to the input end of the first planet carrier 32 to press the outer ring of the second bearing 82 against the supporting stop 321 on the side wall of the first planet carrier 32. In this way, the second bearing 82 can be connected to the first carrier 32 so as to be rotatably connected between the input end of the first carrier 32 and the rotating shaft 2233 of the motor 2 via the second bearing 82.

In the preferred embodiment of the screwing host shown in connection with fig. 23, 25 and 29, the annular inner side of the inner annular wall 1131 of the annular groove 113 is provided with a first radial annular groove 1133, and the annular inner side of the inner annular wall 1131 is also formed with an annular boss 1134, the annular boss 1134 being located below the first radial annular groove 1133. The third bearing 83 is supported on the top side of the annular boss 1134 and the first ring gear 34 is supported on the bottom side of the annular boss 1134. Wherein, an opening compression ring 92 is arranged in the first radial annular groove 1133, and the edge of the opening compression ring 92 compresses the outer ring of the third bearing 83. In this way, the outer race of the third bearing 83 is pressed between the opening pressing ring 92 and the annular boss 1134 to connect the third bearing 83 to the main casing 11.

In the preferred embodiment of the screwing host shown in connection with fig. 25, 28, 29 and 32, the screwing host further includes a second pressing ring 93, the second pressing ring 93 is provided with a fixing ring 931 and a pressing ring portion 932 formed by protruding an inner side of the fixing ring 931 in an axial direction, a top end of the pressing ring portion 932 is pressed against a bottom end of the first ring gear 34, and the fixing ring 931 is attached to an inner bottom portion of the main housing 11 surrounding the inner ring wall 1131. Thus, by the connection of the second presser 93 to the main casing 11, the second presser 93 is fitted to the main casing 11, and presses the bottom end of the first ring gear 34.

In the preferred embodiment of the screwing machine shown in connection with fig. 2, 10, 18, 27, 30 to 33, the secondary planetary reducer 4 of the screwing machine comprises a second sun gear 41, a second planet carrier 42, a plurality of second planet gears 43 and a second ring gear 44.

Wherein the top end of the second sun gear 41 is connected to the bottom end of the first planet carrier 32. A fifth bearing 85 is provided between the upper annular inner side wall of the second carrier 42 and the annular outer side wall of the lower section of the first carrier 32 to effect a rotationally supported connection of the second carrier 42 to the first carrier 32.

And a sixth bearing 86 is provided between the annular inner side wall of the lower portion of the second carrier 42 and the annular outer side wall of the bottom end of the second sun gear 41 to achieve a rotatably supported connection between the second carrier 42 and the second sun gear 41.

The plurality of second planetary gears 43 are disposed on the second carrier 42 at intervals and rotatably engaged with the second gear portion 312 of the second sun gear 41. The inner tooth portion of the second ring gear 44 meshes with the plurality of second planetary gears 43, and is supported in a second axial annular groove 114 at the bottom end of the main housing 11.

Wherein the diameter of the second planet carrier 42 is smaller than the motor 2 and the diameter of the second gear ring 44 is larger than the motor 2, which is advantageous for enabling the secondary planetary reducer 4 to have a larger reduction ratio while maintaining a smaller radial dimension of the secondary planetary reducer 4.

In the preferred embodiment of the screwing host shown in connection with fig. 3, 4, 9, 10, 18, 25, 29 to 34, the screwing host further comprises a seventh bearing 87, a third clamping ring 94, a first clamping plate 14 and a second clamping plate 15. Wherein the inner ring of the seventh bearing 87 is connected to the annular outer sidewall of the lower portion of the second planet carrier 42, the third pressing ring 94 is connected to the bottom end of the second planet carrier 42, and the inner ring of the seventh bearing 87 is pressed against the first annular step 421 of the outer wall of the second planet carrier 42, so that the seventh bearing 87 is fixed to the second planet carrier 42 by the third pressing ring 94.

And, the outer edge of the first pressing plate 14 is disposed at the bottom end of the main casing 11 along the first mounting cavity 111 to fix the second ring gear 44 at the bottom of the main casing 11. And, the first pressing plate 14 is formed with a central circular hole 141, the inner side wall of the central circular hole 141 is formed with a second annular step 1411 facing away from the second ring gear 44, and the top of the outer race of the seventh bearing 87 is supported on the second annular step 1411. The top of the second pressing plate 15 is formed with an annular groove 151 into which the seventh bearing 87 and the third pressing ring 94 are sunk, so that the seventh bearing 87 is connected with the housing assembly 1 and the rotational connection between the second carrier 42 and the housing assembly 1 is achieved.

In a further preferred embodiment, the inner wall of the central hole of the second pressure plate 15 is also provided with a second radial annular groove 152, the screwing host also comprising the sealing ring 95. The sealing ring 95 is disposed in the second radial annular groove 152, and an annular inner wall of the sealing ring 95 is in rotary sealing fit with an annular outer side wall of the bottom of the second planet carrier 42, so as to realize rotary sealing connection between the second planet carrier 42 and the housing assembly 1, and prevent rainwater or dust from entering the first installation cavity 111 through a gap between the second-stage planetary reducer 4 and the housing assembly 1. And, an axial top end of the first transmission gear 51 is connected to a bottom end of the second carrier 42. In this manner, the speed reducer assembly transmits power to the first transfer gear 51 after two-stage deceleration.

Although the present embodiment has been described using a two-stage planetary reducer as an example, the reducer assembly may be a harmonic reducer or an RV reducer, or may be a two-stage reducer or a single-stage reducer without any particular description. In addition, although the present embodiment is described taking the frameless inner rotor motor shown in fig. 19 to 22 as an example, other types of motors, such as a coreless motor or other dc or ac motors, may be selected without particular limitation.

It should be understood that although the present disclosure has been described in terms of various embodiments, not every embodiment or implementation is provided with a single embodiment, and this description is for clarity only, and one skilled in the art should recognize that the embodiments may be combined appropriately to form other embodiments that will be understood by those skilled in the art.

The foregoing description is illustrative of the embodiments of the present application and is not to be construed as limiting the scope of the embodiments of the present application. Any equivalent alterations, modifications and combinations thereof will be effected by those skilled in the art without departing from the spirit and principles of the embodiments of the application, and it should be understood that they are intended to be within the scope of the embodiments of the application.

Claims (10)

1. A screw-on host machine, comprising:

A motor (2);

the speed reducer assembly is connected to the output end of the motor (2);

a first transfer gear (51) connected to the output of the reducer assembly;

A second transmission gear (52) which is meshed with the first transmission gear (51) and is larger than the diameter of the first transmission gear (51), and a connecting part (521) of a screwing head is formed on the second transmission gear (52) in the axial direction;

Wherein the motor (2), the reducer assembly and the first transmission gear (51) are arranged along a first axis, the second transmission gear (52) is arranged on a second axis parallel to the first axis, and the second transmission gear (52) is meshed with the first transmission gear (51);

And the driving box (7) is internally provided with a driver (71), and the driver (71) is connected with the motor (2) through a cable.

2. Screwing host according to claim 1, wherein the housing assembly (1) of the screwing host comprises:

a main housing (11) formed with 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;

A bottom plate (12) of which a portion corresponding to the second installation cavity (112) is connected to the bottom end of the main housing (11);

Wherein the motor (2) and the speed reducer assembly are mounted to the first mounting cavity (111), the first transmission gear (51) is arranged on the bottom plate (12) and faces the first mounting cavity (111), and the second transmission gear (52) is mounted between the second mounting cavity (112) and the bottom plate (12).

3. The screwing host machine according to claim 2, further comprising:

A ninth bearing (89) with an inner ring connected to the upper part of the main shaft of the second transmission gear (52), wherein a second annular mounting table (115) is formed around the second mounting cavity (112) on the inner side of the upper part of the main housing (11), and the ninth bearing (89) is supported and arranged on the second annular mounting table (115);

and a fourth pressing ring (96) with an outer edge connected to the main housing (11), a convex ring (962) pressing the outer ring of the ninth bearing (89) formed at the bottom thereof, a fourth annular mounting table (961) formed at the top inner wall thereof, and a through hole (963) for passing the upper portion of the second transmission gear (52) formed in the middle of the fourth annular mounting table (961).

4. The screwing host machine according to claim 3, further comprising:

And a first sealing ring (97) which is supported and arranged on the fourth annular mounting table (961) and the annular inner side wall of which is in sealing fit with the annular outer wall of the upper part of the second transmission gear (52).

5. The screwing host machine according to claim 2, further comprising:

And a tenth bearing (810) with an inner ring connected to the lower part of the main shaft of the second transmission gear (52), wherein a third annular mounting table (121) is formed on the bottom plate (12), and the tenth bearing (810) is supported and arranged on the third annular mounting table (121).

6. The screwing host machine according to claim 5, further comprising:

And the annular inner side wall of the second sealing ring (98) is in sealing fit with the side wall of the lower part of the main shaft of the second transmission gear (52), a third radial annular groove (122) is formed below the third annular mounting table (121) on the bottom plate (12), and the second sealing ring (98) is arranged in the third radial annular groove (122).

7. The screwing host machine according to claim 2, wherein the second transmission gear (52) is provided with a shaft tube portion (522), an external gear disc portion (523) and an internal gear disc portion (524), the external gear disc portion (523) is coaxially disposed on an outer side wall of the shaft tube portion (522), the internal gear disc portion (524) is coaxially disposed on an inner side wall of the shaft tube portion (522), and the internal gear disc portion (524) is provided with a water leakage hole (5241) and a connection hole (5242) which is matched with a screwing head;

Wherein the bottom plate (12) is formed with a through hole (123) adapted to the outer diameter of the shaft tube portion (522), and the lower section of the shaft tube portion (522) extends to the through hole (123).

8. The screwing host machine according to claim 2, further comprising:

And an eighth bearing (88), the inner ring of which is connected with the annular outer wall of the axial bottom end of the first transmission gear (51), the inner wall of the part of the bottom plate (12) corresponding to the first mounting cavity (111) is provided with a bearing supporting groove (124), and the eighth bearing (88) is arranged in the bearing supporting groove (124).

9. The screwing host according to claim 2, wherein the driving box (7) is connected to the outer wall of the housing assembly (1) and is close to the first mounting cavity (111), wherein a closed-loop sealing groove (701) is formed on the outer wall of the housing assembly (1) by the driving box (7), and a sealing strip is arranged in the closed-loop sealing groove (701) and is close to the outer wall of the housing assembly (1);

And the driving box (7) is provided with a screw hole (702) and a cable perforation (703) which are connected with the shell assembly (1), and the screw hole (702) and the cable perforation (703) are distributed in an area surrounded by the closed-loop sealing groove (701) on the outer wall of the driving box (7).

10. The screwing host machine according to claim 1, wherein a hexagonal mounting head (511) is formed at an axial top end of the first transmission gear (51), a hexagonal mounting hole (422) is formed at a bottom of an output end of the speed reducer assembly, the hexagonal mounting head (511) extends into the hexagonal mounting hole (422) to be in limit fit, and a wheel disc portion (512) of the first transmission gear (51) is connected to a bottom end face of the output end of the speed reducer assembly through a bolt.