CN218226377U

CN218226377U - Electric spanner

Info

Publication number: CN218226377U
Application number: CN202222102791.1U
Authority: CN
Inventors: 彭小湖
Original assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Current assignee: Jiangsu Dongcheng Tools Technology Co Ltd
Priority date: 2022-08-10
Filing date: 2022-08-10
Publication date: 2023-01-06
Anticipated expiration: 2032-08-10

Abstract

An electric wrench comprises a shell, a motor and a detection device which are positioned in the shell, a transmission mechanism connected with the motor and an output shaft driven by the transmission mechanism, wherein the transmission mechanism is provided with a planetary gear train mechanism connected with the longitudinal front end of the motor and an inner gear ring sleeved on the periphery of the planetary gear train mechanism, and the output shaft is connected with the longitudinal front end of the planetary gear train mechanism. The detection device comprises a middle part sleeved on the periphery of the output shaft, a front end part positioned at the longitudinal front end of the middle part, a rear end part positioned at the longitudinal rear end of the middle part and a strain gauge attached to the middle part, wherein the front end part is fixedly connected to the inner wall of the shell, the rear end part is fixedly connected to the front end of the inner gear ring, and the detection device detects the torque parameters at the position of the inner gear ring through the strain gauge. The connection is carried out in such a way that the detection device has no deformation virtual position, and the torque parameter of the inner gear ring can be accurately transmitted to the detection device, so that the detected torque parameter is more accurate.

Description

Electric spanner

[ technical field ]

The utility model relates to an electric spanner field, in particular to decide moment of torsion electric spanner of accurate control moment of torsion.

[ background art ]

The electric wrench is a wrench using a power supply or a battery as power, is a tool for screwing a high-strength bolt, is called a high-strength bolt gun, and is mainly divided into an impact wrench, a torsional shear wrench, a fixed torque wrench, a corner wrench and an angular wrench. The existing constant-torque electric wrench generally realizes the control of the torque of a motor by controlling the current of the motor; generally, after the error of the motor torque is amplified by the multi-stage reduction gear, the accuracy of the output torque of the final electric wrench is not high. The existing constant-torque electric wrench generally realizes the control of the torque of the motor by controlling the current of the motor, however, the variation range of the torque of the motor is large in the process of voltage reduction of a battery pack, and finally the accuracy of the output torque of the electric wrench is not high. Meanwhile, there is a scheme of detecting the output torque of the electric wrench through a torque sensor, but the virtual positions at the two ends of the torque sensor are large, so that the accuracy of a torque signal is not high, and the torque sensor cannot be used for accurate torque control.

Accordingly, there is a need for an improved power wrench that overcomes the drawbacks of the prior art.

[ contents of utility model ]

To the not enough of prior art, the utility model aims to provide a decide moment of torsion electric spanner, it has realized the accurate control of moment of torsion.

The utility model provides a technical scheme that prior art problem adopted is: an electric wrench comprises a shell, a motor, a transmission mechanism and an output shaft, wherein the motor is located in the shell, the transmission mechanism is connected to the motor, the output shaft is driven by the transmission mechanism, the transmission mechanism is located in the shell and is provided with a planetary gear train mechanism and an inner gear ring, the planetary gear train mechanism is connected to the longitudinal front end of the motor, the inner gear ring is sleeved on the periphery of the planetary gear train mechanism, and the output shaft is connected to the longitudinal front end of the planetary gear train mechanism and extends out of the shell forwards. The electric wrench comprises a detection device positioned in the shell, the detection device comprises an intermediate part sleeved on the periphery of the output shaft, a front end part positioned at the longitudinal front end of the intermediate part, a rear end part positioned at the longitudinal rear end of the intermediate part and a strain gauge attached to the intermediate part, the front end part is fixedly connected to the inner wall of the shell, the rear end part is positioned at the front end of the inner gear ring and is fixedly connected to the inner gear ring, and the detection device detects the torque parameters at the inner gear ring through the strain gauge.

The further improvement scheme is as follows: the inner gear ring is provided with an annular part sleeved on the periphery of the planetary gear train mechanism, an end wall protruding outwards from the longitudinal front end of the annular part and a fastener, the rear end part is attached to the front end face of the end wall, and the fastener penetrates through the end wall and is connected to the rear end part, so that the inner gear ring is fixed to the detection device.

The further improvement scheme is as follows: the detection device comprises a circuit board sleeved on the periphery of the middle part, and the circuit board is arranged close to the rear end part and electrically connected to the strain gauge.

The further improvement scheme is as follows: the electric wrench comprises a display screen positioned on the rear end face of the shell, and the display screen is electrically connected with the circuit board to display the detected torque parameters.

The further improvement scheme is as follows: the detection device is provided with a through hole which longitudinally penetrates through the front end part, the middle part and the rear end part, and the output shaft is accommodated in the through hole and extends forwards out of the shell.

The further improvement scheme is as follows: the motor is provided with a motor shaft extending along the longitudinal direction, the rotation axis of the motor shaft and the rotation axis of the output shaft are located on the same axis, and the motor shaft is connected to the planetary gear train mechanism to drive the output shaft to rotate.

The further improvement scheme is as follows: the shell is provided with a main body part extending along the longitudinal direction and a holding part connected below the main body part, the motor, the transmission mechanism, the output shaft and the detection device are all accommodated in the main body part, and the output shaft is partially exposed out of the longitudinal front end of the main body part.

The further improvement scheme is as follows: the main body part is provided with a rear shell for accommodating the motor and the transmission mechanism and a front shell connected to the longitudinal front end of the rear shell, the output shaft and the detection device are located in the front shell, and the front end part of the detection device is fixed on the inner wall of the front shell.

The further improvement scheme is as follows: the output shaft is provided with an output head exposed out of the longitudinal front end of the front shell, the electric wrench comprises a reaction force output mechanism connected to the output head, and the reaction force output mechanism is used for being connected with a working head.

The further improvement scheme is as follows: the section of intermediate portion is regular polygon setting, detection device is equipped with the several foil gage, and the several foil gage is followed the circumference of intermediate portion evenly arranges the setting.

Compared with the prior art, the utility model discloses following beneficial effect has: the electric wrench comprises a detection device positioned in a shell, the detection device comprises an intermediate part sleeved on the periphery of an output shaft, a front end part positioned at the longitudinal front end of the intermediate part, a rear end part positioned at the longitudinal rear end of the intermediate part and a strain gauge attached to the intermediate part, the front end part is fixedly connected to the inner wall of the shell, the rear end part is positioned at the front end of an inner gear ring and is fixedly connected to the inner gear ring, and the detection device detects torque parameters at the inner gear ring through the strain gauge. Connected in such a way that said detection means are free from distorted dummy bits; when the electric wrench collects the torque parameters on the inner gear ring through the detection device, the torque parameters of the inner gear ring can be accurately transmitted to the detection device, so that the detected torque parameters are more accurate.

[ description of the drawings ]

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings:

fig. 1 is a perspective view of an electric wrench according to a preferred embodiment of the present invention;

FIG. 2 is a cross-sectional view of the power wrench of FIG. 1;

FIG. 3 is a perspective view of the power wrench of FIG. 1 with a portion of the housing removed;

FIG. 4 is a perspective view of the detection device of the power wrench of FIG. 1;

FIG. 5 is a schematic perspective view of the sensing device shown in FIG. 4 from another angle;

FIG. 6 is a cross-sectional view of the detection device and front housing shown in FIG. 4;

fig. 7 is an exploded view of the detection device and the front case shown in fig. 6.

The meaning of the reference symbols in the figures:

100. electric wrench 10, case 11, main body 101, rear case 102, front case 12, grip 13, footboard 14, operation button 15, display 20, motor 21, motor shaft 30, transmission mechanism 31, planetary gear mechanism 32, ring gear 321, ring portion 322, end wall 323, fastener 40, output shaft 50, detection device 51, intermediate portion 52, front end portion 521, pin 53, rear end portion 54, through hole 55, circuit board 60, reaction force output mechanism 70, battery pack

[ detailed description of the invention ]

The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Words such as "upper", "lower", "front", "rear", etc., indicating directions or positional relationships described below are based only on directions or positional relationships shown in the drawings, are only for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the devices/elements referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Referring to fig. 1 to 3, an electric wrench 100 for inserting a working head (not shown) according to the present invention is shown. In the present embodiment, the electric wrench 100 is a constant torque electric wrench, and includes a housing 10, a motor 20 located in the housing 10, a transmission mechanism 30 connected to the motor 20, an output shaft 40 driven by the transmission mechanism 30, and a detection device 50 located in the housing 10, wherein the output shaft 40 is partially exposed at the front end of the housing 10. The output shaft 40 is a wrench head at least partially exposed out of the front end of the housing 10, and the motor 20 drives the output shaft 40 to rotate through the transmission mechanism 30.

The housing 10 includes a main body 11 extending in a longitudinal direction, a grip portion 12 connected to a lower portion of the main body 11, and a leg plate portion 13 located at a lower end of the grip portion 12. The motor 20, the transmission mechanism 30, the output shaft 40 and the detection device 50 are all accommodated in the main body 11, and a portion of the output shaft 40 is exposed to the front end of the main body 11 in the longitudinal direction. The main body 11 includes a rear case 101 accommodating the motor 20 and the transmission mechanism 30, and a front case 102 connected to a front end of the rear case 101 in a longitudinal direction, and the output shaft 40 and the detection device 50 are located in the front case 102. The grip portion 12 is used for holding when a user operates the electric wrench and is provided with an operation button 14, and the operation button 14 is operated by the user to control the start and stop of the electric wrench 100.

The electric wrench 100 further includes a reaction force output mechanism 60 connected to the output shaft 40, a battery pack 70 connected to a lower end of the leg plate portion 13, and a main controller (not shown) located in the case 10, the battery pack 70 supplying electric power to the electric wrench 100. The output shaft 40 is provided with an output head exposed to the longitudinal front end of the main body portion 11, and the reaction force output mechanism 60 is the output head connected to the output shaft 40 as the above-described working head. The electric wrench 100 is labor-saving in detaching and attaching the bolt under the action of the driving output shaft 40 and the reaction force output mechanism 60. The main controller is located in the foot plate part 13 of the housing 10 and above the battery pack 70; meanwhile, the main controller is electrically connected to the motor 20 to control the start and stop of the motor 20, so as to drive the output shaft 40 to rotate or stop.

The motor 20 is provided with a motor shaft 21 extending in the longitudinal direction, the rotation axis of the motor shaft 21 is on the same axis as the rotation axis of the output shaft 40, and the motor shaft 21 is connected to the planetary gear train mechanism 31 of the transmission mechanism 30 to drive the output shaft 40 to rotate. The transmission mechanism 30 is located in the rear casing 101 of the casing 10 and is provided with a planetary gear train mechanism 31 connected to the front end of the motor 20 in the longitudinal direction and an annular gear 32 sleeved on the periphery of the planetary gear train mechanism 31, and the output shaft 40 is connected to the front end of the planetary gear train mechanism 31 in the longitudinal direction and extends forwards out of the front casing 102 of the casing 10.

Referring to fig. 4 to 7, the detecting device 50 includes an intermediate portion 51 disposed on the outer periphery of the output shaft 40, a front end portion 52 located at a front end of the intermediate portion 51 in the longitudinal direction, a rear end portion 53 located at a rear end of the intermediate portion 51 in the longitudinal direction, a strain gauge (not shown) attached to the intermediate portion 51, and a through hole 54. The through hole 54 longitudinally penetrates the front end portion 52, the intermediate portion 51 and the rear end portion 53, and the output shaft 40 is accommodated in the through hole 54 and extends forward out of the front housing 102 of the housing 10.

The front end portion 52 is fixedly connected to the inner wall of the housing 10, the rear end portion 53 is located at the front end of the ring gear 32 and is fixedly connected to the ring gear 32, and the detecting device 50 detects a torque parameter at the ring gear 32 through a strain gauge. Connected such that said detecting means 50 are free from deformed dummy bits; when the electric wrench 100 collects the torque parameter of the ring gear 32 through the detection device 50, the torque parameter of the ring gear 32 can be accurately transmitted to the detection device 50, so that the detected torque parameter is more accurate.

Specifically, the front end 52 of the detection device 50 is fixed to the inner wall of the front housing 102 by a pin 521, so that the detection device 50 is fixed relative to the housing 10. As shown in fig. 5, the ring gear 32 is provided with a ring portion 321 sleeved on the periphery of the planetary gear mechanism 31, an end wall 322 protruding outward from the longitudinal front end of the ring portion 321, and a fastener 323, the rear end portion 53 is attached to the front end surface of the end wall 322, and the fastener 323 passes through the end wall 322 and is connected to the rear end portion 53, so that the ring gear 32 is fixed to the detection device 50, and the ring gear 32 is fixed relative to the housing 10.

The cross section of the middle part 51 is a regular polygon, the detection device 50 is provided with a plurality of the strain gauges, and the plurality of strain gauges are uniformly arranged along the circumferential direction of the middle part 51. The detecting device 50 further includes a circuit board 55 disposed on the outer periphery of the middle portion 51, and the circuit board 55 is disposed adjacent to the rear end portion 53 and electrically connected to the strain gauge. The electric wrench 100 includes a display screen 15 located on the rear end surface of the housing 10, and the display screen 15 is electrically connected to the circuit board 55 to display the detected torque parameters.

The utility model discloses in, electric wrench 100 is including being located the detection device 50 of casing 10, detection device 50 locates the intermediate part 51 of the periphery of output shaft 40, is located the preceding tip 52 of the vertical front end of intermediate part 51, is located the rear end 53 of the vertical rear end of intermediate part 51 and laminates the foil gage on intermediate part 51 including the cover, preceding tip 52 fixed connection is in the inner wall of casing 10, rear end 53 is located the front end of ring gear 32 and fixed connection in ring gear 32, detection device 50 detects the torque parameter of ring gear 32 department through the foil gage. Connected such that said detecting means 50 are free from deformed dummy bits; when the electric wrench 100 collects the torque parameter of the ring gear 32 through the detection device 50, the torque parameter of the ring gear 32 can be accurately transmitted to the detection device 50, so that the detected torque parameter is more accurate.

The present invention is not limited to the above-described embodiments. It will be readily appreciated by those skilled in the art that there are numerous alternatives to the disclosed electric wrench without departing from the spirit and scope of the present invention. The protection scope of the present invention is subject to the content of the claims.

Claims

1. An electric wrench comprises a shell, a motor, a transmission mechanism and an output shaft, wherein the motor is positioned in the shell, the transmission mechanism is connected with the motor, the output shaft is driven by the transmission mechanism, the transmission mechanism is positioned in the shell and is provided with a planetary gear train mechanism connected with the longitudinal front end of the motor and an inner gear ring sleeved on the periphery of the planetary gear train mechanism, and the output shaft is connected with the longitudinal front end of the planetary gear train mechanism and extends forwards out of the shell; the method is characterized in that: the electric wrench comprises a detection device positioned in the shell, the detection device comprises an intermediate part sleeved on the periphery of the output shaft, a front end part positioned at the longitudinal front end of the intermediate part, a rear end part positioned at the longitudinal rear end of the intermediate part and a strain gauge attached to the intermediate part, the front end part is fixedly connected to the inner wall of the shell, the rear end part is positioned at the front end of the inner gear ring and is fixedly connected to the inner gear ring, and the detection device detects the torque parameters at the inner gear ring through the strain gauge.

2. The electric wrench as claimed in claim 1, wherein: the inner gear ring is provided with an annular part sleeved on the periphery of the planetary gear train mechanism, an end wall protruding outwards from the longitudinal front end of the annular part and a fastener, the rear end part is attached to the front end face of the end wall, and the fastener penetrates through the end wall and is connected to the rear end part, so that the inner gear ring is fixed to the detection device.

3. The power wrench as claimed in claim 2, wherein: the detection device comprises a circuit board sleeved on the periphery of the middle part, and the circuit board is arranged close to the rear end part and electrically connected to the strain gauge.

4. The power wrench as claimed in claim 3, wherein: the electric wrench comprises a display screen positioned on the rear end face of the shell, and the display screen is electrically connected to the circuit board to display the detected torque parameters.

5. The electric wrench as claimed in claim 1, wherein: the detection device is provided with a through hole which longitudinally penetrates through the front end part, the middle part and the rear end part, and the output shaft is accommodated in the through hole and extends forwards out of the shell.

6. The power wrench as claimed in claim 5, wherein: the motor is provided with a motor shaft extending along the longitudinal direction, the rotation axis of the motor shaft and the rotation axis of the output shaft are positioned on the same axis, and the motor shaft is connected to the planetary gear train mechanism to drive the output shaft to rotate.

7. The electric wrench as claimed in claim 1, wherein: the shell is provided with a main body part extending along the longitudinal direction and a holding part connected to the lower side of the main body part, the motor, the transmission mechanism, the output shaft and the detection device are all contained in the main body part, and the output shaft is partially exposed out of the longitudinal front end of the main body part.

8. The electric wrench as claimed in claim 7, wherein: the main body part is provided with a rear shell for accommodating the motor and the transmission mechanism and a front shell connected to the longitudinal front end of the rear shell, the output shaft and the detection device are positioned in the front shell, and the front end part of the detection device is fixed on the inner wall of the front shell.

9. The electric wrench as claimed in claim 8, wherein: the output shaft is provided with an output head exposed out of the longitudinal front end of the front shell, the electric wrench comprises a reaction force output mechanism connected to the output head, and the reaction force output mechanism is used for being connected with a working head.

10. The power wrench as claimed in claim 1, wherein: the section of intermediate portion is regular polygon setting, detection device is equipped with the several foil gage, and the several foil gage is followed the circumference of intermediate portion evenly arranges the setting.