Screwing main machine

Abstract

The invention belongs to the technical field of new energy power conversion equipment, and particularly relates to a screwing main machine for power conversion equipment. The main screwing machine comprises a shell assembly (1), a motor (2), a speed reducer assembly, a first transmission gear (51) and a second transmission gear (52). When the main screwing machine works, the rotating speed is reduced and the torque is increased through the speed reducer assembly, and 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). 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 the overall height of the screwing main machine after the screwing head is installed can be shortened. In addition, the input side of the speed reducer assembly extends into the containing space (201) formed in the axial bottom of the motor (2), and the overall axial size of the screwing main machine can be shortened.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy battery replacement equipment, and in particular relates to a screwing host for battery replacement equipment. Background Art

[0002] As a key facility addressing range anxiety, electric vehicle battery swapping stations utilize a modular system to enable rapid battery replacement. The process involves lifting the vehicle's body to expose the underbody battery pack; unlocking the underbody battery pack; replacing the new battery pack, and lowering the vehicle. When removing or installing the battery, the screw holes must be arranged according to their location, using multiple screwdrivers to quickly tighten the screws.

[0003] Chinese patent CN109483212B discloses a screwing tool for an automobile battery replacement device, which includes a motor, a reducer and a screwing head. Since the screwing tool is spliced ​​with a motor and a reducer, and also requires a staggered shaft transmission mechanism to arrange the motor and the reducer at a certain angle to the screwing head, the overall volume occupied by the screwing tool is relatively large. Summary of the Invention

[0004] In view of this, the present invention proposes a screwing host, aiming to make the screwing host more compact in structure and smaller in size.

[0005] The screwing host of the present invention includes a housing assembly, a motor, a reducer assembly, a first transmission gear and a second transmission gear. The main housing of the housing assembly is formed with a first mounting cavity and a second mounting cavity with parallel axes. The motor is mounted at the axial top of the first mounting cavity, and a receiving space is formed on the inner side of the axial bottom thereof. The reducer assembly is located in the first mounting cavity, and its input side extends into the receiving space of the motor and is connected to the rotating shaft of the motor. The first transmission gear is connected to the output side of the reducer assembly. The second transmission gear is mounted in the second mounting cavity, meshed with the first transmission gear and larger than the diameter of the first transmission gear, and the second transmission gear is formed with a connecting portion of a screwing head in the axial direction.

[0006] When the screwing machine is operating, after the motor outputs power, the speed is first reduced and the torque is increased by the reducer assembly. The meshing transmission between the first and second transmission gears further reduces the speed and increases the torque, ultimately ensuring that the output speed and torque meet the screwing requirements. Since there is no need for a separate transmission device to change the transmission direction, the size of the screwing machine is greatly reduced. Furthermore, positioning the screwing head parallel to the motor axis, compared to positioning the screwing head directly on an extension of the motor axis, also helps shorten the overall height of the screwing machine after the screwing head is installed. Furthermore, the input side of the reducer assembly extends into the axial bottom of the motor to form a receiving space, which helps shorten the overall axial dimension of the screwing machine.

[0007] In a preferred technical solution of the aforementioned screwing machine of the present invention, the motor comprises an outer stator and an inner rotor. The inner rotor is located inside the outer stator, and the motor shaft of the inner rotor is formed with a support ring, a bracket, and a rotating shaft. The top end of the support ring is connected to the rotating shaft via the bracket. The axial height of the inner rotor is smaller than that of the outer stator, and the axial height of the rotating shaft is smaller than that of the support ring, thereby forming the accommodation space inside the axial bottom of the motor.

[0008] In a preferred technical solution of the aforementioned screwdriver unit of the present invention, an annular groove is formed in the upper portion of the first mounting cavity. The annular groove is bounded by the annular inner wall, the annular bottom wall, and the inner annular wall of the first mounting cavity. The outer stator and support ring of the motor are disposed in the annular groove. Furthermore, the reducer assembly is connected to the rotating shaft of the motor through the top opening of the inner annular wall.

[0009] In a preferred technical solution of the above-mentioned screwing host of the present invention, the reducer assembly includes a first-stage planetary reducer, and the first sun gear, first ring gear and multiple first planetary gears of the first-stage planetary reducer are all located within the axial height range of the outer stator of the motor.

[0010] In a preferred technical solution of the aforementioned screwing machine of the present invention, the first sun gear is provided with a first shaft portion, a first gear portion, and a first shaft disc portion, wherein the first gear portion and the first shaft disc portion are coaxially connected to the outer wall of the first shaft portion; wherein the diameter of the first gear portion is smaller than the diameter of the first shaft disc portion. A mounting shaft hole is formed at the bottom of the motor shaft, and the first shaft portion extends into the mounting shaft hole and engages in a keyed manner, and the bottom end surface of the shaft is connected to the first shaft disc portion by a bolt.

[0011] In a preferred technical solution of the aforementioned screwing machine of the present invention, the reducer assembly includes a primary planetary reducer and a secondary planetary reducer, the secondary planetary reducer including a second sun gear and a second planet carrier, and the second sun gear is within the axial height range of the second planet carrier. Furthermore, the axial bottom end of the first planet carrier of the primary planetary reducer extends into the top end of the second planet carrier, a fifth bearing is disposed between the axial bottom end of the first planet carrier and the top end of the second planet carrier, and the axial bottom end of the first planet carrier is connected to the top end of the second sun gear.

[0012] In a preferred technical solution of the aforementioned screwing machine of the present invention, the second sun gear is provided with a second shaft portion, a second gear portion coaxially connected to the second shaft portion, and a second shaft disc portion; wherein the diameter of the second gear portion is smaller than the diameter of the second shaft disc portion. A hexagonal shaft hole is formed at the axial bottom end of the first planetary carrier, and the hexagonal shaft head of the second shaft portion extends into the hexagonal shaft hole for a limited fit. The second shaft disc portion is bolted to the bottom end surface of the first planetary carrier.

[0013] In a preferred technical solution of the aforementioned screwdriver unit of the present invention, the reducer assembly includes a primary planetary reducer and a secondary planetary reducer. The axial top end of the first transmission gear extends into a retaining hole at the axial bottom end of the second planetary carrier of the secondary planetary reducer, and the wheel disc portion of the first transmission gear is bolted to the end surface of the axial bottom end of the second planetary carrier.

[0014] In a preferred technical solution of the above-mentioned screwing host of the present invention, the screwing host also includes a mounting plate and a first bearing. The outer edge of the mounting plate is connected to the outer top wall of the main housing surrounding the first mounting cavity, and the middle portion of the mounting plate is recessed toward the first mounting cavity to form a sunken step, with at least a portion of the bottom end of the sunken step extending into the top side of the outer stator of the motor. Furthermore, the sunken step is further provided with a central opening facing the rotating shaft of the motor, and the bottom side of the mounting plate is formed with a bearing mounting groove surrounding the central opening. Furthermore, the first bearing is disposed in the bearing mounting groove, and its inner ring is connected to the rotating shaft of the motor.

[0015] In a preferred technical solution of the aforementioned screwing machine of the present invention, the screwing machine further includes an encoder assembly comprising a rotor disk and a stator disk. The rotor disk is mounted on a first annular mounting platform at the top end of the motor's rotating shaft, axially extending no further than the top side of the motor's outer stator and axially closer to the top wall of the mounting plate relative to the first bearing. The stator disk is connected to the outer top wall of the mounting plate and faces the rotor disk. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0017] Figure 1 It is a schematic diagram of the external structure of the screwing host of the present invention.

[0018] Figure 2 It is a schematic diagram of the exploded structure of the screwing host of the present invention.

[0019] Figure 3 This is a schematic diagram of the exploded structure of the housing assembly of the screwing host according to the present invention from a top perspective.

[0020] Figure 4 It is a schematic diagram of the exploded structure of the housing assembly of the screwing host according to the present invention from the bottom perspective.

[0021] Figure 5 It is a structural schematic diagram of the drive box of the screwing host of the present invention.

[0022] Figure 6 This is a schematic diagram of the connection structure between the first transmission gear, the second transmission gear and the main housing of the screwing host of the present invention.

[0023] Figure 7 This is a schematic diagram of the connection structure between the first transmission gear, the second transmission gear and the base plate of the screwing host of the present invention.

[0024] Figure 8 It is a structural schematic diagram of the bottom plate of the screwing host of the present invention.

[0025] Figure 9 It is a schematic diagram of the connection structure of the secondary planetary reducer, the main housing and the first pressure plate of the screwing main unit of the present invention.

[0026] Figure 10 It is a schematic diagram of the connection structure between the second gear ring and the main housing of the screwing host of the present invention.

[0027] Figure 11 It is a schematic diagram of the connection structure between the top of the main shell of the screwing host of the present invention and the first-stage planetary reducer.

[0028] Figure 12 It is a schematic diagram of the connection structure between the top of the main housing of the screwing host of the present invention, the motor and the second transmission gear.

[0029] Figure 13 It is a schematic diagram of the connection structure of the main shell of the screwing host, the mounting plate and the fourth pressure ring of the present invention.

[0030] Figure 14It is a schematic cross-sectional structure diagram of the screwing host corresponding to the second installation cavity of the present invention.

[0031] Figure 15 It is a schematic diagram of the assembly structure of the second transmission gear of the screwing host of the present invention.

[0032] Figure 16 This is a schematic diagram of the exploded structure of the second transmission gear of the screwing host of the present invention.

[0033] Figure 17 This is a schematic diagram of the connection structure between the first transmission gear and the secondary planetary reducer of the screwing main unit of the present invention.

[0034] Figure 18 It is a schematic diagram of the structural assembly of the two-stage planetary reducer of the screwing main unit of the present invention.

[0035] Figure 19 It is a schematic diagram of the connection structure between the motor and the first sun gear of the screwing host of the present invention.

[0036] Figure 20 This is a schematic diagram of the bottom structure of the motor of the screwing host of the present invention.

[0037] Figure 21 This is a schematic diagram of the top connection structure of the motor of the screwing host of the present invention.

[0038] Figure 22 It is a structural diagram of the motor itself of the screwing host of the present invention.

[0039] Figure 23 It is a structural schematic diagram of the main shell of the screwing host corresponding to the first installation cavity of the present invention.

[0040] Figure 24 It is a schematic diagram of the connection structure between the mounting plate and the first bearing of the screwing host of the present invention.

[0041] Figure 25 It is a schematic cross-sectional structural diagram of the screwing host corresponding to the first installation cavity of the present invention.

[0042] Figure 26 It is a schematic diagram of the overall assembly structure of the motor, reducer assembly and first transmission gear of the screwing host of the present invention.

[0043] Figure 27 This is a first schematic diagram of the overall exploded structure of the motor, reducer assembly and first transmission gear of the screwing host of the present invention.

[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 screwing main unit of the present invention.

[0045] Figure 29This is a schematic diagram of the connection structure of the first-stage planetary reducer of the screwing main unit of the present invention.

[0046] Figure 30 This is a schematic diagram of the connection structure of the two-stage planetary reducer of the screwing main unit of the present invention.

[0047] Figure 31 It is a schematic diagram of the connection structure between the secondary planetary reducer and the main housing of the screwing main unit of the present invention.

[0048] Figure 32 This is a schematic diagram of the position structure of the first-stage planetary reducer of the screwing main unit of the present invention 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 screwing host of the present invention.

[0050] Figure 34 It is a structural schematic diagram of the second pressing plate of the screwing host of the present invention.

[0051] The accompanying drawings are numerals as follows:

[0052] 1- Shell assembly;

[0053] 11 - Main housing; 111 - First mounting cavity; 112 - Second mounting cavity; 113 - Annular groove; 1131 - Inner ring 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-sunken step portion; 132-bearing mounting groove; 133-middle opening;

[0056] 14-first pressing plate; 141-middle circular hole; 1411-second annular step;

[0057] 15-second pressing 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-core ring; 223-motor shaft; 2231-support ring; 2232-bracket; 2233-rotating shaft; 22331-mounting shaft hole; 22332-first annular mounting platform;

[0060] 201-accommodation space;

[0061] 3-One-stage planetary reducer;

[0062] 31-first sun gear; 311-first shaft portion; 312-first gear portion; 313-first shaft disc portion;

[0063] 32-first planetary carrier; 321-support limiter; 322-hexagonal shaft hole;

[0064] 33-first planetary gear;

[0065] 34-first ring gear;

[0066] 4-Two-stage planetary reducer;

[0067] 41 - second sun gear; 411 - second shaft portion; 4111 - hexagonal shaft head; 412 - second gear portion; 413 - second shaft disc portion;

[0068] 42-second planet carrier; 421-first annular step; 422-hexagonal mounting hole;

[0069] 43-second planetary gear;

[0070] 44-second ring gear;

[0071] 51-first transmission gear; 511-hexagonal mounting head; 512-wheel disc;

[0072] 52 - second transmission gear; 521 - connection portion; 522 - shaft cylinder portion; 523 - outer toothed disc portion; 524 - inner connecting disc portion; 5241 - water leakage hole; 5242 - connection hole;

[0073] 61- rotor disk; 62- stator disk;

[0074] 7-Drive 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-opening 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-convex ring; 963-through hole; 97-first sealing ring; 98-second sealing ring. DETAILED DESCRIPTION

[0077] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention is further described in detail with reference to the following examples.

[0078] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0079] The screwing machine provided in this embodiment is used in a battery swapping device. For example, the battery swapping device may include a lifting platform and multiple screwing machines. The multiple screwing machines are arranged on the lifting platform according to the location of the screws securing the battery to the vehicle. The screwing machine drives the screwing head to rotate, removing or installing the screws securing the battery to the vehicle.

[0080] In one possible scenario, the lift is raised close to the bottom of the car's battery. The screwdriver drives the screwdriver to remove the screws, removing the original battery. The lift then lowers the battery, lifting it. After the new battery is placed on the lift, the lift is raised again, and the screwdriver drives the screwdriver to tighten the screws, installing the new battery in the car.

[0081] Example 1

[0082] Combine Figures 1 to 16 In the illustrated embodiment, the screwing machine 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 is larger in diameter than the first transmission gear 51. A screwing head connection portion 521 is formed axially on the second transmission gear 52.

[0083] 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 .

[0084] When the screwing main unit is in operation, as the driver 71 in the drive box 7 drives the motor 2 to rotate, the speed is first reduced and the torque is increased by the reducer assembly. Then, the meshing transmission between the first transmission gear 51 and the second transmission gear 52 further reduces the speed and increases the torque, ultimately ensuring that the output speed and torque meet the requirements for screwing. Since there is no need to separately provide a transmission device to change the transmission direction, the volume of the screwing main unit is greatly reduced. At the same time, arranging the screwing head in a direction parallel to the axis of the motor 2 is also beneficial for shortening the overall height of the screwing main unit after the screwing head is installed, compared to directly arranging the screwing head on an extension of the axis of the motor 2.

[0085] Furthermore, a driver 71 is provided inside the driver box 7, and the driver 71 is connected to the motor 2 via a cable. The driver box 7 isolates the driver 71 from the motor 2, which helps to avoid the mutual influence of the heat of the driver 71 and the motor 2, improves the heat dissipation effect of the screwing host as a whole, and facilitates the maintenance of the driver 71 inside the driver 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 bottom plate 12. The main housing 11 defines a first mounting cavity 111 and a second mounting cavity 112. The first mounting cavity 111 is disposed along a first axis, and the second mounting cavity 112 is disposed along a second axis. The portion of the bottom 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 mounted in the first mounting cavity 111, the first transmission gear 51 is disposed 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. In this manner, the motor 2, the reducer assembly, and the first and second transmission gears 51, 52 are secured together by the main housing 11 and the bottom plate 12.

[0088] Combine 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 installation cavity 111. The drive box 7 is closely attached to the outer wall of the housing assembly 1 to form a closed-loop sealing groove 701, in which a sealing strip is provided, which is closely attached to the outer wall of the housing assembly 1.

[0089] And, combined Figure 5The driver 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 driver box 7. In this way, since the screw holes 702 and cable through-holes 703 between the driver box 7 and the housing assembly 1 are located within the area enclosed by the sealing strip, water can be prevented from corroding the screws or entering the interior of the housing assembly 1 or the driver box 7 through the cable through-holes 703.

[0090] Combine Figure 3 and Figures 12 to 16 In the preferred embodiment shown, the main screw drive 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 portion of the main shaft of the second transmission gear 52. A second annular mounting platform 115 is formed on the inner side of the upper portion of the main housing 11, surrounding the second mounting cavity 112. The ninth bearing 89 is supported on this second annular mounting platform 115. The outer edge of the fourth pressure ring 96 is connected to the main housing 11, and a raised ring 962 is formed on its bottom to press against the outer ring of the ninth bearing 89. This achieves a rotationally supported connection between one end of the second transmission gear 52 and the housing assembly 1.

[0091] Combine 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. A through-hole 963 is formed in the center of the fourth annular mounting platform 961, through which the upper portion of the second transmission gear 52 passes. The main screwdriver further includes a first sealing ring 97, which is supported on the fourth annular mounting platform 961. The first sealing ring 97 has an annular inner sidewall that seals against the annular outer wall of the upper portion of the second transmission gear 52. This helps prevent water or dust from entering the main housing 11 through the gap between the upper portion of the second transmission gear 52 and the main housing 11.

[0092] Combine Figure 3 、 Figures 14 to 16 In the preferred embodiment of the screwing main unit shown, the screwing main unit further includes a tenth bearing 810, the inner ring of which is connected to the lower portion 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 and mounted on the third annular mounting platform 121. In this way, a rotationally supported connection is achieved between the lower portion of the main shaft of the second transmission gear 52 and the housing assembly 1.

[0093] Combine Figures 14 to 16In the preferred embodiment of the screwing main unit shown, the screwing main unit further includes a second sealing ring 98, the inner sidewall of which seals against the sidewall of the lower portion of the main shaft of the second transmission gear 52. The base plate 12 is formed with a third radial annular groove 122 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 through the gap between the second transmission gear 52 and the base plate 12.

[0094] Combine Figure 1 and Figures 14 to 16 In the preferred embodiment of the screwing main unit shown, the second transmission gear 52 is provided with a shaft barrel portion 522, an outer toothed disc portion 523, and an inner disc portion 524. The outer toothed disc portion 523 is coaxially arranged on the outer side wall of the shaft barrel portion 522, and the inner disc portion 524 is coaxially arranged on the inner side wall of the shaft barrel portion 522. The inner disc portion 524 is provided with a leak hole 5241 and a connection hole 5242 for mating with the screwing head. The bottom plate 12 is formed with a through hole 123 adapted to the outer diameter of the shaft barrel portion 522, and the lower section of the shaft barrel portion 522 extends to the through hole 123. In this way, while achieving the connection and mating between the second transmission gear 52 and the screwing head, it can also adapt to rainy weather conditions. Rainwater or mud and sand can be discharged through the leak hole 5241, so that the screwing main unit is not affected by rain or snow.

[0095] Combine Figures 8 to 10 as well as Figure 17 and Figure 18 In the preferred embodiment of the screwing main unit shown, the reducer assembly can include a first-stage planetary reducer 3 and a second-stage planetary reducer 4. The axial top end of the first transmission gear 51 is formed with a hexagonal mounting head 511, and the output end of the reducer assembly, for example, the bottom of the output end of the second planetary carrier 42 of the second-stage planetary reducer 4, is formed with a hexagonal mounting hole 422. The hexagonal mounting head 511 extends into the hexagonal mounting hole 422 to limit the fit, and the wheel disc portion 512 of the first transmission gear 51 is connected to the bottom end surface of the output end of the reducer assembly by bolts. In this way, since the wheel disc portion 512 of the first transmission gear 51 and the output end of the reducer assembly are in close contact and there is no gap, it is beneficial to shorten the axial size of the first transmission gear 51 and the reducer assembly.

[0096] Combine Figures 6 to 8 In the preferred embodiment of the screwing main unit shown, the main unit further includes an eighth bearing 88, the inner ring of which is connected to the annular 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 manner, the first transmission gear 51 is rotatably connected relative to the housing assembly 1.

[0097] Example 2

[0098] Combine Figure 1 and Figure 2 In the illustrated embodiment of a screwing machine, the machine 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 defines a first mounting cavity 111 and a second mounting cavity 112, both of which are axially parallel. The motor 2 is mounted at the axial top of the first mounting cavity 111, and a receiving space 201 is formed inside the axial bottom of the motor 2. The reducer assembly is located in the first mounting cavity 111, with the input side of the reducer assembly extending into the receiving space 201 of the motor 2 and connected to the rotating shaft 2233 of the motor 2.

[0099] 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 installation cavity 112. The second transmission gear 52 meshes with the first transmission gear 51 and is larger than the diameter of the first transmission gear 51. The second transmission gear 52 is formed with a screw head connection portion 521 in the axial direction.

[0100] For example, each screwing host may be independently configured with a drive box 7 to drive the motor 2, or all the screwing hosts may be connected to a control cabinet via cables, in which a plurality of drive units are integrated.

[0101] When the screwing machine is working, after the motor 2 outputs power, the speed is first reduced and the torque is increased by the reducer assembly, and then the speed is further reduced and the torque is increased by the meshing transmission of the first transmission gear 51 and the second transmission gear 52, so that the output speed and torque finally meet the requirements of screwing. Since there is no need to separately set a transmission device to change the transmission direction, the volume of the screwing machine is greatly reduced. At the same time, the screwing head is arranged in a direction parallel to the axis of the motor 2, which is more conducive to shortening the overall height of the screwing machine after the screwing head is installed, compared to directly arranging the screwing head on the extension line of the axis of the motor 2. In addition, the input side of the reducer assembly extends into the accommodating space 201 formed by the axial bottom of the motor 2, which is conducive to shortening the overall axial size of the screwing machine.

[0102] Combine Figure 2 and Figure 17 and Figure 18In the preferred embodiment of the screwdriver shown, the reducer assembly includes a primary planetary reducer 3 and a secondary planetary reducer 4. The axial top end of the first transmission gear 51 extends into a retaining hole at the axial bottom end of the second planetary carrier 42 of the secondary planetary reducer 4, and the disc portion 512 of the first transmission gear 51 is bolted to the end surface of the axial bottom end of the second planetary carrier 42. This close contact and lack of clearance between the disc portion 512 of the first transmission gear 51 and the output end of the reducer assembly facilitates shortening the axial dimensions of the first transmission gear 51 and the reducer assembly.

[0103] Combine Figures 19 to 22 In the preferred embodiment of the screwing host shown, the motor 2 includes an outer stator 21 and an inner rotor 22, the inner rotor 22 is located on the inner side of the outer stator 21, and the 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 of the support ring 2231 is connected to the rotating shaft 2233 through the bracket 2232.

[0104] For example, the inner rotor 22 is radially arranged with a magnet 221, a core ring 222, and a motor shaft 223 in order from the outside to the inside. The inner rotor 22 is axially shorter than the outer stator 21, and the rotating shaft 2233 of the motor 2 is axially shorter than the support ring 2231, thereby forming an accommodating space 201 inside the axial bottom of the motor 2.

[0105] In this way, by reducing the size of the internal structure of the motor 2 itself, an accommodating space 201 is formed for the input side of the reducer assembly to extend into, thereby shortening the axial size of the screw main unit.

[0106] Combine Figure 3 、 Figure 11 、 Figure 22 and Figure 23 In the preferred embodiment of the screwing main unit shown, an annular groove 113 is formed in the upper portion of the first installation cavity 111 of the main housing 11. The annular groove 113 is surrounded by the annular inner wall, the annular bottom wall, and the inner annular wall 1131 of the first installation 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 outer stator 21 of the motor 2 and the magnetic steel 221, the core ring 222, and the support ring 2231 of the inner rotor 22 can all be disposed in the annular groove 113. In this way, the motor 2 is supported and disposed in the annular groove 113 of the main housing 11. In addition, 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] Combine Figure 13 as well as Figures 21 to 25In the preferred embodiment of the screwing host shown, the screwing host also 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 toward the first mounting cavity 111 to form a sunken step portion 131. At least part of the bottom end of the sunken step portion 131 extends into the top side of the outer stator 21 of the motor 2. In addition, the sunken step portion 131 is also provided with a central opening 133 facing the rotating 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 the inner ring of the first bearing 81 is connected to the rotating shaft 2233 of the motor 2. Among them, Figure 22 The top of the rotating shaft 2233 of the inner motor 2 is located within the height range of the top side of the outer stator 21. In this way, the shorter rotating shaft 2233 of the motor 2 cooperates with the sunken step 131 of the mounting plate 13 to achieve a rotationally supported connection between the motor 2 and the housing assembly 1, which helps to shorten the overall axial dimension of the screwdriver.

[0108] Combine Figure 12 and Figure 13 In the preferred embodiment of the screwing host shown, the screwing host also includes an encoder assembly, which includes a rotor disk 61 and a stator disk 62. The encoder assembly can be selected as a magnetic encoder or an inductive encoder. For example, when the encoder assembly is a magnetic encoder, the rotor disk 61 can be selected as a magnetic ring. The rotor disk 61 can be mounted on the first annular mounting platform 22332 at the top of the rotating shaft 2233 of the motor 2, and does not exceed the top side of the outer stator 21 of the motor 2 in the axial direction. It is axially closer 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 is directly opposite the rotor disk 61.

[0109] Thus, after the mounting plate 13 forms the sunken step 131, the mounting plate 13 forms a receiving space 201 for the stator disc 62 at its top. The mounting structure of the encoder assembly of this embodiment is also conducive to maintaining the compactness of the entire screwing machine in the height direction.

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

[0111] Combine Figure 2 、 Figures 22 to 24In the preferred embodiment of the screwing main unit shown, the reducer assembly includes a first-stage planetary reducer 3, and the first sun gear 31, the first ring gear 34 and the multiple first planetary 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] In this way, in the height direction, the total height of the motor 2 and the first-stage planetary reducer 3 is substantially equivalent to the total height of the motor 2 , which is beneficial to shortening the overall height dimension of the screwing main machine.

[0113] Combine Figure 19 and Figure 20 In the preferred embodiment of the screwing machine shown, the first sun gear 31 is provided with a first shaft portion 311, a first gear portion 312, and a first shaft disc portion 313. The first gear portion 312 and the first shaft disc 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 disc portion 313. A mounting shaft hole 22331 is formed at the bottom of the rotating shaft 2233 of the motor 2. The first shaft portion 311 extends into the mounting shaft hole 22331 and engages with the first shaft disc portion 313 in a keyed manner. The bottom end surface of the rotating shaft 2233 is connected to the first shaft disc portion 313 of the first sun gear 31 by bolts.

[0114] In this manner, the first sun gear 31 is connected to the bottom end surface of the rotating shaft 2233 of the motor 2 via its own first shaft disc portion 313. This connection method helps shorten the axial dimensions 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 facilitates a larger connection area with the rotating shaft 2233 of the motor 2, making the connection more reliable. Furthermore, the smaller diameter of the first gear portion 312 of the first sun gear 31 contributes to a smaller overall size of the first-stage planetary reducer 3 and a larger transmission ratio.

[0115] Combine Figure 2 and Figures 25 to 30 In the preferred embodiment of the screwing main unit shown, in the screwing main unit, 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, and the second sun gear 41 is within the axial height range of the second planet carrier 42. In addition, 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 of the second sun gear 41.

[0116] In this way, the axial bottom end of the first planetary carrier 32 extends into the top end of the second planetary carrier 42 and is connected to 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 need to occupy additional axial dimensions, which is conducive to maintaining the compactness of the screwing main unit in the axial direction or height direction.

[0117] Continue to refer to Figure 27 In the preferred embodiment of the screwdriver shown, the second sun gear 41 is provided with a second shaft portion 411, a second gear portion 312 coaxially connected to the second shaft portion 411, and a second shaft disc portion 413. The diameter of the second gear portion 312 is smaller than that of the second shaft disc 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 positional fit. The second shaft disc portion 413 of the second sun gear 41 is connected to the bottom end surface of the first planetary carrier 32 via bolts.

[0118] In this manner, the second sun gear 41 is connected to the bottom end surface of the rotating shaft 2233 of the first planetary carrier 32 via its own second shaft disc portion 413. This connection method helps shorten the axial dimensions required for the connection. The diameter of the second gear portion 312 is smaller than the diameter of the second shaft disc portion 413. The larger diameter of the second shaft disc portion 413 facilitates a larger connection area between the second sun gear 41 and the first planetary carrier 32, making the connection more reliable. Furthermore, the smaller diameter of the second gear portion 312 of the second sun gear 41 contributes to a smaller overall size of the two-stage planetary reducer 4 and a larger transmission ratio.

[0119] Example 3

[0120] Combine Figure 1 、 Figure 2 The illustrated screwing machine 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 comprises a main housing 11 and a base plate 12. The main housing 11 defines a first mounting cavity 111 and a second mounting cavity 112, both of which are axially parallel. 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 axial top of the first mounting cavity 111, and an accommodating space 201 is formed inside the axial bottom of the motor 2.

[0121] The reducer assembly is located in the first mounting cavity 111 and includes a primary planetary reducer 3 and a secondary planetary reducer 4. The primary planetary reducer 3 extends into the housing 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 secondary 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, meshing with the first transmission gear 51 and having a larger diameter than the first transmission gear 51. The second transmission gear 52 has a screw-head connection portion 521 formed on its axial direction.

[0122] When the screwing machine is working, 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 for a third time through the meshing transmission of the first transmission gear 51 and the second transmission gear 52, so that the output speed and torque finally meet the requirements of screwing the screw. Since there is no need to set up a separate transmission device to change the transmission direction, the volume of the screwing machine is greatly reduced. At the same time, setting the screwing head in a direction parallel to the axis of the motor 2 is also conducive to shortening the overall height of the screwing machine after the screwing head is installed. In addition, the accommodation space 201 formed by the first-stage planetary reducer 3 extending into the axial bottom of the motor 2 is conducive to shortening the overall axial size of the screwing machine.

[0123] Combine Figure 4 、 Figure 13 、 Figure 21 、 Figure 24 and Figure 25 In a preferred embodiment of the screwing main unit shown, the screwing 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 toward the first mounting cavity 111 to form a sunken step 131. The bottom side of the sunken step 131 is formed with a bearing mounting groove 132 facing the rotating shaft 2233 of the motor 2. The first bearing 81 is installed in the bearing mounting groove 132, and its inner ring is connected to the upper portion of the rotating shaft 2233 of the motor 2. Figure 22 The top of the rotating shaft 2233 of the inner motor 2 is located within the height range of the top side of the outer stator 21. In this way, the shorter rotating shaft 2233 of the motor 2 is combined with the sunken step 131 of the mounting plate 13 to achieve a rotationally supported connection between the motor 2 and the housing assembly 1, which helps to shorten the overall axial dimension of the screwdriver.

[0124] Combine Figure 3 、 Figure 11 、 Figure 22 and Figure 23In the preferred embodiment of the screwing host shown, the main shell 11 is formed with an annular groove 113 in the upper part of the first installation cavity 111, and the annular groove 113 is surrounded by the annular inner wall of the first installation 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] Combine Figure 19 and Figure 20 as well as Figures 23 to 27 In the preferred embodiment of the screwing machine shown, the first-stage planetary reducer 3 extends into the inner side of the inner annular wall 1131 toward the top opening 1132 and includes a first sun gear 31, a first planet carrier 32, and a plurality of first planetary gears 33. The first sun gear 31 includes a first shaft portion 311, a first gear portion 312 coaxially connected to the outer wall of the first shaft portion 311, and a first shaft disc portion 313.

[0126] The first shaft portion 311 extends into the mounting hole 22331 of the rotating shaft 2233 and is keyed to the shaft. The first shaft disc portion 313 is bolted to the bottom end of the rotating shaft 2233. Thus, the first sun gear 31 is connected to the bottom end of the rotating shaft 2233 of the motor 2 via its own first shaft disc portion 313. This connection method helps reduce the axial dimension required for the connection.

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

[0128] In this way, both the inner side and the outer side of the input end of the first planet carrier 32 are supported by bearings, so that the rotation connection of the first planet carrier 32 is more reliable and stable.

[0129] A fourth bearing 84 is disposed between the lower inner wall of the first planet carrier 32 and the lower outer wall of the first shaft portion 311 of the first sun gear 31. A plurality of first planet gears 33 are rotatably mounted on the first planet carrier 32 at intervals and mesh with the first gear portion 312 of the first sun gear 31. The internal teeth of the first ring gear 34 mesh with the plurality of first planet gears 33.

[0130] In this way, the first-stage planetary reducer 3 is powered by the first sun gear 31. When the first sun gear 31 rotates, it drives multiple first planetary gears 33 to rotate on their own. Moreover, the first planetary gears 33 also revolve around the first ring gear 34 under the support and connection of the first planet carrier 32, thereby achieving a larger reduction ratio.

[0131] Combine Figure 29 In the preferred embodiment of the screwing machine shown, the screwing machine also includes a first pressing ring 91, which is connected to the input end of the first planetary carrier 32 to press the outer ring of the second bearing 82 against the support stop 321 on the side wall of the first planetary carrier 32. In this way, the second bearing 82 can be connected to the first planetary carrier 32, so that the input end of the first planetary carrier 32 and the rotating shaft 2233 of the motor 2 are rotatably connected via the second bearing 82.

[0132] Combine 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 side of the inner annular wall 1131 of the annular groove 113. An annular boss 1134 is also formed on the inner side of the inner annular wall 1131. The annular boss 1134 is 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. 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. In this way, the outer ring of the third bearing 83 is compressed between the open pressure ring 92 and the annular boss 1134, thereby connecting the third bearing 83 to the main housing 11.

[0133] Combine Figure 25 、 Figure 28 、 Figure 29 and Figure 32 In the preferred embodiment of the screwing main unit shown, the screwing main unit further includes a second pressing ring 93, which is provided with a fixing ring 931 and a pressing ring portion 932 formed by axially protruding from the inner side of the fixing ring 931. The top end of the pressing ring portion 932 presses against the bottom end of the first ring gear 34, and the fixing ring 931 is connected to the inner bottom of the main housing 11 surrounding the inner ring wall 1131. In this way, through the connection between the second pressing ring 93 and the main housing 11, the second pressing ring 93 is assembled on the main housing 11 and presses the bottom end of the first ring gear 34.

[0134] Combine Figure 2 、 Figure 10 、 Figure 18 、 Figure 27 、 Figures 30 to 33 In the preferred embodiment of the screwing machine shown, the two-stage planetary reducer 4 of the screwing machine includes a second sun gear 41 , a second planet carrier 42 , a plurality of second planetary gears 43 and a second ring gear 44 .

[0135] 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 annular inner sidewall of the upper portion of the second planet carrier 42 and the annular outer sidewall of the lower portion of the first planet carrier 32 to achieve a rotational support connection between the second planet carrier 42 and the first planet carrier 32.

[0136] Furthermore, a sixth bearing 86 is provided between the annular inner sidewall of the lower portion of the second planet carrier 42 and the annular outer sidewall of the bottom end of the second sun gear 41 to achieve a rotational support connection between the second planet carrier 42 and the second sun gear 41 .

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

[0138] Among them, the diameter of the second planetary carrier 42 is smaller than that of the motor 2, and the diameter of the second ring gear 44 is larger than that of the motor 2, which is beneficial for maintaining a smaller radial size of the secondary planetary reducer 4 while making the secondary planetary reducer 4 have a larger reduction ratio.

[0139] Combine Figure 3 、 Figure 4 、 Figure 9 、 Figure 10 、 Figure 18 、 Figure 25 、 Figures 29 to 34 In the preferred embodiment of the screwing main unit shown, the screwing main unit 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 annular outer wall of the lower portion 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 third pressure ring 94 secures the seventh bearing 87 to the second planetary carrier 42.

[0140] Furthermore, the outer edge of the first pressure plate 14 is disposed along the first mounting cavity 111 at the bottom end of the main housing 11 to secure the second ring gear 44 to the bottom of the main housing 11. Furthermore, the first pressure plate 14 is formed with a central circular hole 141. The inner sidewall of the central circular hole 141 is formed with a second annular step 1411 facing away from the second ring gear 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 is formed with an annular groove 151 into which the seventh bearing 87 and the third pressure ring 94 are inserted, thereby connecting the seventh bearing 87 to the housing assembly 1 and achieving a rotational connection between the second planetary carrier 42 and the housing assembly 1.

[0141] In a further preferred embodiment, the inner wall of the center hole of the second pressure plate 15 is further provided with a second radial annular groove 152, and the screwing main body further includes a sealing ring 95. The sealing ring 95 is disposed in the second radial annular groove 152, and the annular inner wall of the sealing ring 95 engages in a rotational seal with the annular outer 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. In this way, the reducer assembly transmits power to the first transmission gear 51 after two stages of reduction.

[0142] It should be noted that although the reducer assembly is a two-stage planetary reducer in this embodiment, the reducer assembly can also be a harmonic reducer or an RV reducer without special instructions, and is not limited to a two-stage reducer, but can also have only one stage reducer. Figures 19 to 22 The frameless inner rotor motor is shown as an example for illustration, but other types of motors may be selected without special requirements or restrictions, such as a coreless motor or other DC or AC motors.

[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 narrative method of the specification is only for the sake of 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 description is only an illustrative embodiment of the present invention and is not intended to limit the scope of the present invention. Any equivalent changes, modifications, and combinations made by any person skilled in the art without departing from the concept and principle of the present invention should fall within the scope of protection of the present invention.

Claims

1. A screwing host, characterized in that: include: A housing assembly (1), wherein a main housing (11) is formed with a first installation cavity (111) and a second installation cavity (112) whose axes are parallel to each other; A motor (2) is mounted on the axial top of the first mounting cavity (111), with an accommodating space (201) formed inside the axial bottom of the motor; a reducer assembly, which is located in the first mounting cavity (111), and whose input side extends into the accommodating space (201) of the motor (2) and is connected to the rotating shaft (2233) of the motor (2); a first transmission gear (51) connected to the output side of the reducer assembly; A second transmission gear (52) is installed in the second installation cavity (112), meshed with the first transmission gear (51), and larger than the diameter of the first transmission gear (51), and the second transmission gear (52) is formed with a screwing head connection portion (521) in the axial direction.

2. The screwing host according to claim 1, characterized in that: The motor (2) comprises: outer stator (21); an inner rotor (22) located on 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), wherein the top end of the support ring (2231) and the rotating shaft (2233) are connected via the bracket (2232); The axial height of the inner rotor (22) is smaller than that of the outer stator (21), and the axial height of the rotating shaft (2233) is smaller than that of the supporting ring (2231), so as to form the accommodating space (201) inside the axial bottom of the motor (2).

3. The screwing host according to claim 1, characterized in that: An annular groove (113) is formed at the upper portion of the first installation cavity (111), the annular groove (113) being surrounded by the annular inner wall, the annular bottom wall and the inner annular wall (1131) of the first installation cavity (111), and the outer stator (21) and the support ring (2231) of the motor (2) are arranged in the annular groove (113); Furthermore, the reducer assembly is connected to the rotating shaft (2233) of the motor (2) through the top opening (1132) of the inner ring wall (1131).

4. The screwing host according to claim 1, characterized in that: The reducer assembly comprises a first-stage planetary reducer (3), wherein a first sun gear (31), a first ring gear (34), and a plurality of first planetary gears (33) of the first-stage planetary reducer (3) are all located within an axial height range of an outer stator (21) of the motor (2).

5. The screwing host according to claim 4, characterized in that: The first sun gear (31) is provided with a first shaft portion (311), a first gear portion (312) and a first shaft disc portion (313), wherein the first gear portion (312) and the first shaft disc 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); A mounting shaft hole (22331) is formed at the bottom of the rotating shaft (2233) of the motor (2), the first shaft portion (311) extends into the mounting shaft hole (22331) and is engaged in a key connection manner, and the bottom end surface of the rotating shaft (2233) and the first shaft disc portion (313) are connected by bolts.

6. The screwing host according to claim 1, characterized in that: The reducer assembly comprises a first-stage planetary reducer (3) and a second-stage planetary reducer (4), the second-stage planetary reducer (4) comprises a second sun gear (41) and a second planet carrier (42), and the second sun gear (41) is within an 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 of the second sun gear (41).

7. The screwing host according to claim 6, characterized in that: The second sun gear (41) is provided with a second shaft portion (411), 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); A hexagonal shaft hole (322) is formed at the axial bottom end of the first planet carrier (32), the hexagonal shaft head (4111) of the second shaft portion (411) extends into the hexagonal shaft hole (322) for position-limiting engagement, and the second shaft disc portion (413) is connected to the bottom end surface of the first planet carrier (32) via bolts.

8. The screwing machine according to claim 1, characterized in that: The reducer assembly includes a first-stage planetary reducer (3) and a second-stage planetary reducer (4); The axial top end of the first transmission gear (51) extends into a limiting hole at the axial bottom end of the second planetary carrier (42) of the secondary planetary reducer (4), and the wheel disc portion (512) of the first transmission gear (51) is connected to the end surface of the axial bottom end of the second planetary carrier (42) by bolts.

9. The screwing host according to claim 1, characterized in that: Also includes: a mounting plate (13), the outer edge of which is connected to the 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 sunken step portion (131), at least a portion of the bottom end of the sunken step portion (131) extends into the top side of the outer stator (21) of the motor (2); and the sunken step portion (131) is further provided with a middle opening (133) facing the rotating shaft (2233) of the motor (2), and a bearing mounting groove (132) surrounding the middle opening (133) is formed on the bottom side of the mounting plate (13); A first bearing (81) is arranged in the bearing mounting groove (132), and its inner ring is connected to the rotating shaft (2233) of the motor (2).

10. The screwing host according to claim 9, characterized in that: Also included is an encoder assembly, the encoder assembly comprising: a rotor disk (61) mounted on a first annular mounting platform (22332) at the top end of the rotating shaft (2233) of the motor (2), not exceeding the top side of the outer stator (21) of the motor (2) in the axial direction, and being closer to the top wall of the mounting plate (13) relative to the first bearing (81) in the axial direction; A stator disk (62) is connected to the outer top wall of the mounting plate (13) and faces the rotor disk (61).

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