TWM576947U - Torque control apparatus of electric screwdriver - Google Patents

Abstract

The present invention relates to a torque control device for an electric screwdriver, which is used for connecting a tool head, and comprises a driving shell, a driving module, a torsion sleeve and at least one strain gauge, and the tool head is connected to the front end of the driving shell The transmission module is disposed in the driving housing, and can drive the tool head to rotate relative to the driving housing. The torsion sleeve is disposed in the driving housing, and is connected to the driving housing and the transmission module, and can be generated by the driving module. Deformation, the strain gauge is placed on the torsion sleeve, and the deformation of the torsion sleeve can be detected and recorded. The creation of the data of the electric screwdriver in use is completely recorded by the electric screwdriver equipped with the strain gauge. Each time the torque processing value can be accurately controlled, thereby improving the accuracy and efficiency of the machining process.

Description

Torque control device for electric screwdriver

The present invention relates to a structural improvement of a hand tool, and more particularly to a torque control device for an electric screwdriver.

The electric screwdriver is a hand tool for attaching and detaching bolts or screws, etc., and the rotation of the internal rotation motor enables the bolts or screws to be quickly attached and detached to the surface to be processed.

The prior art electric screwdriver has a structure that can adjust its torsion force, because the electric screwdriver needs to adjust the rotation force according to the material and hardness of the surface to be processed and the structural strength of the screw or the bolt itself to avoid the force. If the surface to be machined and the structure of the bolt itself are too strong, or if the force is too weak, the electric screwdriver may not be able to securely place the bolt on the machined surface.

More precisely, referring to FIG. 9, the operation flow of the electric screwdriver 90 used in the factory in the prior art is as follows: after the power is turned on, when the user activates the electric screwdriver 90, the internal control board is triggered. And driving the motor to drive a gear box to rotate, the gear box is also connected with a torque adjustment device, the torque adjustment device can set the upper limit of the torque of the electric screwdriver; on the other hand, the gear box is further connected with a mechanical brake mechanism, The brake mechanism is simultaneously connected to the output shaft set, which is the tool head of the electric screwdriver.

When the electric screwdriver reaches its upper limit of torque during operation, the mechanical brake structure is triggered, and the message is sent back to the control board, thereby stopping the rotation of the motor and stopping the entire operation process.

However, the prior art electric screwdriver has the following disadvantages.

First, referring to FIG. 9, the torque adjusting device of the prior art electric screwdriver 90 is configured to pass through a different degree of the spring 94 and the plurality of steel balls (not shown) inside the casing of the electric screwdriver 90. The pressure path is reached. More precisely, when the user sets the specified torque, when the electric screwdriver 90 is twisted to the torque, the steel ball inside the housing will jump, so that the spring 94 is separated from the motor that provides the torque. The situation in which the motor is idling is formed, whereby the user can know that the torque has reached the preset value.

However, each time the user wants to adjust different torques, the electric screwdriver 90 must be taken from the processing to an adjusting device to tighten or loosen the spring 94, and the torque cannot be adjusted manually and in time (another reason) In order to avoid the inaccuracy of artificial adjustment, it is very inconvenient in adjusting the torque.

Secondly, in order to reduce the frequency of adjusting the torsion during processing, the user usually has to prepare a plurality of electric screwdrivers 90 that are twisted to different torques before processing, thus causing a cost burden.

Thirdly, relying on the torsion of the spring 94 and the steel ball and the like, the torsion of the steel ball and the like may cause deformation or fatigue of the structure of the steel ball and the like due to long-term friction and pressure, resulting in the adjustment amount. The error, which in turn causes the user to accurately reverse the degree of torque to be locked when the user is in use.

Fourth, in order to respond to the concept of Industry 4.0, the tools of a new generation of factories should have the function of having various data that can be detected, recorded and adjusted at any time. In other words, the processing elements should be designed to detect the processing status. The sensor, however, the prior art electric screwdriver 90 is not equipped with such a structure that can digitize the machining process, and therefore it is not possible to record the data of each machining process during the machining process.

In summary, the prior art electric screwdriver has its drawbacks.

In view of the shortcomings and deficiencies of the prior art, the present invention provides a torque control device for an electric screwdriver, which is provided with a deformation sensing device capable of detecting the degree of torsion inside the electric screwdriver, whereby the user can reverse the data. Electronically, while automatically adjusting the torque required by the electric screwdriver through the computer.

For the purpose of the above-mentioned creation, the technical means adopted by the present invention is a torque control device for an electric screwdriver, which is used for connecting a tool head, and the torque control device of the electric screwdriver comprises a driving shell, and the opposite ends thereof are respectively The front end of the drive housing is connected to the tool head; a torsion sleeve disposed in the driving housing and connected to the driving housing and the transmission module, and being deformed by the driving module; at least one strain gauge disposed on the torsion sleeve And each of the at least one strain gauge can detect and record the deformation of the torsion sleeve.

The advantage of this creation is that the deformation and the recording of the torsion sleeve are detected by the strain gauge on the torsion sleeve, and the deformation of the torsion sleeve is detected by the strain gauge. At the same time, the torsional force detected by the strain gauge is transmitted. After the value is transferred to the centrally controlled computer, when the torsion sleeve reaches the upper limit of the predetermined torsion force of the user, the user can automatically control the motor to stop the motor that drives the torsion force, thereby achieving the use of springs and steel balls as in the prior art. The effect.

However, at the same time, the user can clearly know the exact torque and other relevant data when the electric screwdriver is operated, so that the user can customize the adjustment for different processing states to achieve a more perfect lock. Function; on the other hand, by the transmission of data, the torque of the electric screwdriver can also be controlled by the computer. Therefore, when using the creation, the user does not have to prepare multiple screwdrivers with different torques to replace them at any time, but can be adjusted through the central computer. The torque applied by each electric screwdriver during the next rotation, thereby improving the processing efficiency and saving costs.

Finally, since the deformation of the torsion sleeve is actually very small, the spring and the steel ball of the prior art are subjected to very large propulsion pressure during each use, and the torsion sleeve of the present invention is in the physical structure. It does not suffer from infrequent and enormous pressure, so the creation is excellent in the durability of actual use compared to the prior art torsion device.

Further, the torsion control device of the electric screwdriver further includes at least one rotary bearing disposed in the drive housing and sleeved on the transmission module, wherein the inner side and the outer side of the rotary bearing are respectively The drive module and the inner wall surface of the drive housing are attached.

Further, in the above-mentioned electric screwdriver torque control device, the torsion sleeve further includes a front connecting portion disposed at a rear of the transmission module; and a rear connecting portion disposed at a rear of the front connecting portion; The sensing portion is disposed between the front connecting portion and the rear connecting portion, and the thickness of the sensing portion is smaller than the thickness of the front connecting portion, the thickness of the sensing portion is smaller than the thickness of the rear connecting portion, and At least one strain gauge is disposed on an outer wall surface of the sensing portion.

Further, in the above-mentioned electric screwdriver torque control device, the sensing portion further includes a sensing wall and a plurality of elongated holes formed through the sensing wall at intervals along the sensing wall, and along the sensing wall The circumferential direction extends, and each of the at least one strain gauge is disposed between any two adjacent elongated holes.

Further, in the above-described electric screwdriver torque control device, the torsion sleeve is screwed and fixed to the inside of the drive housing through a plurality of bolts.

Further, in the foregoing electric screwdriver torque control device, the transmission module is located between the tool head and the torsion sleeve.

The technical means adopted by the present invention for achieving the intended purpose of creation are further explained below in conjunction with the drawings and the preferred embodiment of the present invention.

Referring to FIG. 1 , FIG. 6 and FIG. 7 , the torque control device of the electric screwdriver of the present invention is used for connecting a tool head 91 and a motor 92 . The tool head 91 and the motor 92 are respectively disposed at the front end and the rear end of the creation. .

Please refer to FIG. 2 , FIG. 3 and FIG. 4 , the present invention includes a driving housing 10 , a transmission module 20 , a torsion sleeve 30 , at least one strain gauge 40 and at least one rotating bearing 50 .

Referring to FIG. 2, FIG. 4 and FIG. 8, the opposite ends of the driving housing 10 are respectively a front end and a rear end, and the front end of the driving housing 10 is connected with the tool head 91; the transmission module 20 is disposed on The drive housing 20 is a planetary gear set. In this embodiment, the drive module 20 is a planetary gear set.

Referring to FIG. 2, FIG. 3 and FIG. 8 , the torsion sleeve 30 is disposed in the drive housing 10 and connected to the drive housing 10 and the transmission module 20; in this example, the foregoing transmission module 20 is disposed on the tool. The position of the head 91 and the torsion sleeve 30, but the arrangement of the transmission module 20 and the torsion sleeve 30 is not limited thereto; in addition, in this embodiment, the torsion sleeve 30 is a cylindrical sleeve, but Its shape is not limited to the cylinder.

Referring to FIG. 2, FIG. 3 and FIG. 5, the torsion sleeve 30 can be deformed by the driving module 20, and more precisely, the front end of the torsion sleeve 30 and the transmission module 20 in this embodiment. The inner ring gear (not shown) is fixed, and the rear end of the torsion sleeve 30 is screwed and fixed to the inside of the drive housing 10 through the plurality of bolts 11, and the planetary gear set inside the transmission module 20 is After twisting to a certain torque, the sun gear of the planetary gear set can rotate the ring gear together, so that the ring gear starts to rotate the front end of the torsion sleeve 30, at this time, due to the rear end of the torsion sleeve 30. It is fixed by the drive housing 10 so that it can produce a twisting difference between the front and rear ends.

As shown in FIG. 3 and FIG. 5 , the torsion sleeve 30 further includes a front connecting portion 31 , a rear connecting portion 32 and a sensing portion 33 . The front connecting portion 31 is disposed at the rear of the transmission module 20 and the rear connecting portion. 32 is disposed at the rear of the front connecting portion 31, and the sensing portion 33 is disposed between the front connecting portion 31 and the rear connecting portion 32, and is connected to the two structures in front and rear.

Referring to FIG. 5, more precisely, in this embodiment, the torsion sleeve 30 is a cylindrical sleeve through which both ends are penetrated, and the thickness of the sensing portion 33 is smaller than the thickness of the front connecting portion 31, and the sensing portion The thickness of the portion 33 is also smaller than the thickness of the rear connecting portion 32, and further includes a sensing wall 331 and a plurality of elongated holes 332 on the sensing portion 33. The thickness of the sensing portion 33 refers to the sensing wall 331. The thickness, and the elongated holes 332 are formed to be spaced apart from each other on the sensing wall 331 and extend in the circumferential direction of the sensing wall 331.

As shown in FIG. 3 , each of the at least one strain gauge 40 is disposed on the torsion sleeve 30 and can be used to detect and record the deformation of the torsion sleeve 30. In this embodiment, the number of the at least one strain gauge 40 is The plurality of strain gauges 40 are disposed on the outer wall surface of the sensing portion 33. More precisely, each of the strain gauges 40 is disposed on any two adjacent elongated holes 332. Between the elongated holes 332 and the strain gauges 40, the sensing walls 331 are interlaced with each other.

On the other hand, when the present invention is in use, the strain gauge 40 is electrically connected to a signal sensing device 93, and the value recorded by the strain gauge 40 is transmitted to the external computer through the signal sensing device 93. The signal sensing device 93 is disposed in the torsion sleeve 30, but the installation position is not limited thereto.

Referring to FIG. 4 and FIG. 8 , the at least one rotating bearing 50 is disposed in the driving housing 10 , and in the embodiment, the number of the at least one rotating bearing 50 is two, and the two rotating bearings 50 are respectively The front and rear are disposed on the transmission module 20 , and the inner side surface and the outer side surface of each of the rotating bearings 50 are respectively attached to the inner wall surface of the transmission module 20 and the driving housing 10 .

The following is the use status of the creation and its advantages.

Referring to FIG. 2, FIG. 3 and FIG. 7, the present invention is connected to an external computer (not shown) through the signal sensing device 93, and the upper limit of the torque transmission of the motor 92 is preset through the computer. The signal sensing device can simultaneously transmit information such as braking, processing, and counting.

In actual operation, when the user activates the electric screwdriver to start the motor and a bolt or screw is gradually locked into the object to be processed through the rotation of the tool head 91, the torque received by the tool head 91 is gradually transferred to The sleeve 30 is twisted and the torsion sleeve 30 begins to be slightly twisted. After the twisting variable is generated, it is recorded by the strain gauge 40 and transmitted back to the external computer through the signal sensing device 93. When the recorded amount reaches the preset value before use, the computer stops the motor 92, thereby stopping the electric screwdriver and completing the entire twisting behavior.

The advantages of this creation are as follows:

First, as shown in Figure 3, by installing a strain gauge 40 that can detect and record the shape variable, the creation can record the data in each processing process to determine and integrate each processing. The results, errors, etc., through this data collection, this creation can further match the facilities in the factory to achieve the purpose of Industry 4.0.

Secondly, through the feedback of the torque value, the user can control the torque value transmitted by a single electric screwdriver through the computer. In other words, the user can adjust the upper limit of the torque in each machining process for each electric screwdriver. It is suitable for the purpose of different workpieces. At the same time, the operator who uses the electric screwdriver does not need to prepare a plurality of electric screwdrivers for the use of electric screwdrivers with different torques, so that each electric motor can be quickly and directly adjusted by computer control. The upper limit of the torque of the screwdriver.

Thirdly, referring to FIG. 2 and FIG. 3, the torsion sleeve 30 is used as a device for detecting the torsion force, which can reduce the equipment wear rate of the electric screwdriver during use, thereby improving the service life of the single electric screwdriver.

In summary, the torque control device of the electric screwdriver of the present invention has the advantages of effectively improving the accuracy of use of the electric screwdriver, the service life, and the processing efficiency during use.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Although the present invention has been disclosed above in the preferred embodiment, it is not intended to limit the present invention, and is not in any technical field. A person skilled in the art can make some modifications or modifications to the equivalent embodiments by using the above-disclosed technical contents without departing from the scope of the present invention. Any simple modifications, equivalent changes and modifications made to the above embodiments in accordance with the technical spirit of the present invention are still within the scope of the present technical solution.

10‧‧‧Drive housing

11‧‧‧ bolt

20‧‧‧Drive Module

30‧‧‧Twisted sleeve

31‧‧‧ Front connection

32‧‧‧After the connection

33‧‧‧Sensor

331‧‧‧Sensing wall

332‧‧‧ long hole

40‧‧‧Strain gauge

50‧‧‧Rotary bearing

90‧‧‧ electric screwdriver

91‧‧‧Tool head

92‧‧‧Motor

93‧‧‧Signal sensing device

94‧‧‧ Spring

Figure 1 is a three-dimensional appearance of the creation. Figure 2 is an exploded view of the components of the present creation. FIG. 3 is an exploded enlarged view of the twist sleeve and the signal sensing device of the present invention. Figure 4 is a cross-sectional view of the present creation. Figure 5 is an enlarged cross-sectional view of the twist sleeve of the present invention. Figure 6 is a perspective view of the present invention mounted on an electric screwdriver. Figure 7 is an exploded view of the element of Figure 6. Figure 8 is a cross-sectional view of Figure 6. Figure 9 is an exploded perspective view of a prior art electric screwdriver torque control device.

Claims (6)

A torque control device for an electric screwdriver is used for connecting a tool head, and the torque control device of the electric screwdriver includes a driving shell, and the opposite ends thereof are respectively a front end and a rear end, and the front end of the driving shell For connecting the tool head; a drive module disposed in the drive housing and configured to drive the tool head to rotate relative to the drive housing; a torsion sleeve disposed in the drive housing and coupled to the drive housing Driving the housing and the transmission module, and being deformed by the driving module; at least one strain gauge disposed on the torsion sleeve, and each of the at least one strain gauge can detect and record the torsion The deformation of the sleeve. The torque control device for an electric screwdriver according to claim 1, further comprising at least one rotary bearing disposed in the drive housing and sleeved on the drive module, the inner side and the outer side of the rotary bearing The drive module and the inner wall surface of the drive housing are respectively attached. The torque control device for an electric screwdriver according to claim 1 or 2, wherein the torsion sleeve further comprises a front connecting portion disposed at a rear of the transmission module; and a rear connecting portion disposed at the front connecting portion a sensing portion disposed between the front connecting portion and the rear connecting portion, wherein the thickness of the sensing portion is smaller than a thickness of the front connecting portion, and the thickness of the sensing portion is smaller than that of the rear connecting portion The thickness and the at least one strain gauge are disposed on an outer wall surface of the sensing portion. The torque control device of the electric screwdriver according to claim 3, wherein the sensing portion further comprises a sensing wall and a plurality of elongated holes formed through the sensing wall at intervals with each other, and along the feeling The wall of the measuring wall extends in a circumferential direction, and each of the at least one strain gauge is disposed between any two adjacent elongated holes. The torque control device for an electric screwdriver according to claim 1 or 2, wherein the torsion sleeve is screwed to the inside of the drive housing through a plurality of bolts. The torque control device for an electric screwdriver according to claim 1 or 2, wherein the transmission module is located between the tool head and the torsion sleeve.