TWI748826B - Torque wrench with digital display of preset torque - Google Patents

Abstract

The invention provides a torque wrench with digital display of preset torque, which comprises a body, a driving device, a releasing device, a torque adjusting device and a torque sensing device. The torque adjusting device includes an adjusting member that is rotatably arranged on the main body, and the adjusting member is engaged with the first torsion bar of the driving device to adjust the deviation of the first torsion bar relative to the main body, thereby adjusting the preset torque value, and It is displayed by the display of the torque sensing device, thereby achieving the effect of easy adjustment of the torque value, and at the same time, it is easy to understand the preset torque value of the current torque wrench through the display.

Description

Torque wrench with digital display of preset torque

The present invention relates to a torque wrench, and particularly relates to a torque wrench that digitally displays a preset torque.

For example, the "Torque release wrench of the preset type" in the US Patent Publication No. 4,290,329 has an engaging member at one end of the handle. Connected to the joint and located in the handle, the length of the main beam is longer than that of the secondary beam, and there is a release mechanism between the two. The end of the main beam, which is different from the coupling part, is connected to the handle with screws. The dial is connected to the screw and rotates with it. The screw is driven by the rotating dial to fine-tune the position of the main beam relative to the handle in order to change the release mechanism to act on the handle. The compression degree of the secondary beam achieves the purpose of adjusting the preset torque. Wherein, when the torque wrench is driven to the preset torque, the free end of the secondary beam and the release mechanism are disconnected from the connection relationship and emit a sound to remind the user.

However, the screw for adjusting the torque of the aforementioned preset torque wrench is located on the side of the handle, so it is inconvenient to adjust and use, and the dial is not direct and accurate as a display of the torque value, and it is inconvenient for the user to interpret.

In addition, Taiwan Model Patent No. M568759 discloses a torque wrench. Similar to the aforementioned wrench, the knob at one end of the torque wrench shaft is also exposed outside the hollow tube, so it is inconvenient to operate when adjusting the torque.

In order to solve the above problems, the present invention discloses a torque wrench with digital display of preset torque, which displays the torque value of the torque wrench with a display, which is convenient for users to observe and judge the current torque value, and the torque adjustment device can provide users with quick adjustment of torque value.

To achieve the above objective, the present invention provides a torque wrench with digital display of preset torque in one embodiment, which includes a body, a driving device, a releasing device, a torque adjusting device, and a torque sensing device. The body is provided with a first end and a second end away from the first end along a first axis. An operating hole is provided between the first end and the second end. The operating hole is along a second end perpendicular to the first axis. The axis is open to the body; the driving device has a driving part and a first torsion rod and a second torsion rod respectively extending into the first end of the body. The driving part can drive the fasteners, and the first torsion rod has a partial Circular tooth groove; the release device is arranged between the first torsion bar and the body and is selectively buckled to the second torsion bar. When the torque wrench drives the fastener to reach a preset torque value, the release device can interact with the second torque The rod is in a disconnected state; the torsion adjusting device is rotatably arranged on the body and connected to the first torsion rod. The torsion adjusting device includes an adjusting member that rotates along a third axis perpendicular to the first axis and the second axis Is arranged on the main body and partially exposed in the operating hole, the adjusting member is engaged with the non-full-circle tooth groove to adjust the deviation of the first torsion rod relative to the main body; and; and the torque sensing device is arranged on the main body, and the torque sensing device can The torque value of the torque wrench is sensed, and the torque value is displayed on a display.

Therefore, the present invention displays the current torque value of the torque wrench with a display, which is convenient for the user to observe and judge.

The adjusting member of the present invention is engaged with the end of the first torsion bar with a non-full circumference, so as to provide the user with a quick and light force to drive the adjusting member to adjust the torque value.

Furthermore, the adjusting member of the present invention is partially exposed in the operating hole, so that the user can hold the body by hand and can operate with fingers, which is quite convenient in use.

100: Torque wrench

10: body

10a: the first outer side

10b: second outer side

11: accommodating space

111: Inner Wall

12: first end

13: second end

14: Operation hole

15: The first pivot hole

16: Sensing hole

17: Grip

171: fixed hole

18: Positioning device

181: limit piece

181a: end foot

181b: Arrival

182: Elastomer

20: Drive

21: Drive

22: Connection part

221: The first set of holes

222: The second set of holes

23: The first torsion bar

231: End

232: The first fixed end

233: Partially round tooth groove

234: second pivot hole

235: Groove

236: accommodating hole

24: second torsion bar

241: second fixed end

242: The first card switch

30: release device

31: Leverage

311: The second card switch

312: Abutment Department

32: Top holder

33: release

34: pin

40: Torque adjustment device

41: Adjusting parts

411: Spiral tooth

412: meshing area

413: Toggle Area

42: Spacer

43: shaft

50: Torque sensing device

51: display

52: circuit board

53: processing unit

54: Power

55: sensing element

56: Sensed component

57: Amplification mechanism

571: Swing Piece

571a: Tooth

571b: Connecting hole

572: turntable

572a: Gear part

572b: Disc part

573: Linkage

574: first pivot

575: first piercing

576: open slot

577: hole

578: Second Pivot

579: second piercing

60: holding device

61: top bead

62: Spring

70: Protective cover

71: Pivot

72: Relief

73: limit device

731: Pressure Piece

732: fixed end

733: Pressure End

L1: first axis

L2: second axis

L3: third axis

[Fig. 1] is a schematic diagram of the appearance of the first embodiment of the torque wrench with digital display of preset torque according to the present invention.

[Figure 2] is an exploded view of the structure of the first embodiment of the torque wrench with digital display of preset torque according to the present invention.

[Figure 3] is a schematic partial cross-sectional view taken along the section line 3-3 of Figure 1.

[Fig. 4] is a schematic partial cross-sectional view taken along the section line 4-4 in Fig. 1.

[Fig. 5] is a schematic partial cross-sectional view taken along the section line 5-5 in Fig. 1.

[Fig. 6] is a schematic diagram of the first embodiment of the torque wrench with digital display of preset torque in the use state of the present invention, showing that the protective cover is in the open position and the adjusting member is exposed to facilitate torque adjustment.

[Fig. 7] is a perspective schematic diagram of the first embodiment of the torque wrench with digital display of preset torque according to the present invention, showing that the first torsion bar is driven by the adjusting member to shift relative to the main body, thereby adjusting the torque value.

[Figure 8] is an exploded view of the structure of the second embodiment of the torque wrench with digital display of preset torque according to the present invention.

[Fig. 9A] is a perspective view of the partial structure of the second embodiment of the torque wrench with digital display of preset torque according to the present invention.

[Figure 9B] is a perspective view of the partial structure of the second embodiment of the torque wrench with digital display of preset torque according to the present invention.

[Fig. 10] is a partial cross-sectional schematic diagram of the second embodiment of the torque wrench with digital display of preset torque according to the present invention.

[Fig. 11] is a partial enlarged schematic diagram of the structure of the second embodiment of the torque wrench with digital display of preset torque according to the present invention, showing the main structure of the magnifying mechanism.

The exemplary embodiments of the present invention are described in detail below with reference to the drawings, and are not intended to limit the technical principles of the present invention to specific disclosed embodiments, and the scope of the present invention is only limited by the scope of the patent application, covering alternatives, modifications and Equivalent.

1 to 7, the present invention is a first embodiment of a torque wrench 100 that digitally displays a preset torque, which includes a body 10, a drive device 20, a release device 30, and a torque adjustment device 40 And a torque sensing device 50.

The main body 10 is hollow and has an accommodating space 11. The main body 10 is provided with a first end 12 and a second end 13 away from the first end 12 along a first axis L1. An operating hole 14 is provided between the first end 12 and the second end 13 along with the operating hole 14 A second axis L2 perpendicular to the first axis L1 is opened on the top side of the main body 10. In addition, the body 10 is provided with a first outer side surface 10a and a second outer side surface 10b along a direction perpendicular to a third axis L3 of the first axis L1 and the second axis L2, and the body 10 is provided with a first pivot The hole 15 penetrates through the first outer side surface 10 a and the second outer side surface 10 b, and the first pivot hole 15 communicates with the accommodating space 11.

The driving device 20 has a driving part 21 and a connecting part 22. The driving part 21 can drive fasteners, and the connecting part 22 is provided with a first torsion bar 23 and a second torsion bar 24 which respectively extend into the body 10 Housing space 11. In the embodiment of the present invention, the driving portion 21 is a reversing ratchet type, and the connecting portion 22 has a first set of holes 221 and a second set of holes 222 arranged side by side and separated.

The first torsion rod 23 has an end 231 and a first fixed end 232 away from the end 231. The first fixed end 232 is combined with the first set of holes 221, so that the first torsion bar 23 is connected to the connecting portion 22, and the end 231 extends into the body 10 and has a non-circular tooth groove 233. In the embodiment of the present invention , The non-circular tooth groove 233 is a semicircular spiral tooth groove. In addition, a second pivot hole 234 is provided between the first torsion rod 23 and the end 231 and the first fixed end 232, and the second pivot hole 234 is provided along a direction parallel to the second axis L2.

The second torsion bar 24 has a length smaller than the length of the first torsion bar 23. The second torsion bar 24 has a second fixed end 241 and a first latching portion 242. The second fixed end 241 is coupled to the second assembly hole 222. The second torsion bar 24 is connected to the connecting portion 22, and the first latching portion 242 is snap-connected to the release device 30. Among them, the first torsion bar 23 and the second torsion bar 24 can be respectively elastically bent when the torque wrench 100 is pulled, and because the length of the second torsion bar 24 is less than the length of the first torsion bar 23, the second torsion bar 24 is The amount of elastic deformation is smaller than the amount of elastic deformation of the first torsion bar 23.

The release device 30 is arranged between the first torsion bar 23 and the body 10 and is selectively buckled to the second torsion bar 24. When the torque wrench 100 drives the fastener to reach a preset torque value, the release device 30 can interact with The second torsion bar 24 is in a disconnected state. As shown in FIGS. 2 to 3, the release device 30 includes a lever 31, a holding member 32, and a release member 33. The lever 31 is pivoted to the second pivot hole 234 of the first torsion rod 23 by a pin 34. And it can move between a first position and a second position. In the first position, the lever 31 is buckled with the first latching portion 242, and the release device 30 is in the holding state. In the second position, the lever 31 is The first latch 242 is disconnected, and the release device 30 is in a disconnected state. The lever 31 has a second latching portion 311 and an abutting portion 312, and the holding member 32 is elastically disposed between the abutting portion 312 and a groove 235 of the first torsion rod 23 to make the second latching The portion 311 is kept buckled on the first latch portion 242 and located at the first position, and the release member 33 is disposed in the main body 10. In the embodiment of the present invention, the holding member 32 is a spring, and the releasing member 33 is a screw, which is screwed to the main body 10 and faces the accommodating space 11. When the torque wrench 100 is pulled, the first torsion bar 23 and the second When the torsion bar 24 is bent and reaches the preset torque value, the release member 33 can abut the lever 31 to cause the first latching portion 242 of the second torsion bar 24 and the second latching portion 311 of the lever 31 to break The open state indicates that the torque value has reached the set state.

The torque adjusting device 40 is rotatably disposed on the main body 10 and connected to the first torsion rod 23. The torque adjusting device 40 includes an adjusting member 41 and two spacers 42. The adjusting member 41 has a spiral tooth 411 distributed in the circumferential direction of the adjusting member 41. The adjusting member 41 is pivoted on the first pivot hole 15 of the main body 10 along the third axis L3 by a rotating shaft 43, so that the adjusting member 41 It is rotatably arranged on the main body 10 and partially exposed to the operating hole 14. At this time, the circumferential direction of the adjusting member 41 includes a meshing area 412 inside the main body 10 and a dialing area 413 outside the main body 10. The spiral teeth 411 of the adjusting member 41 are engaged with the non-circular tooth grooves 233, and by rotating the adjusting member 41, the end 231 of the first torsion rod 23 is adjusted to be offset relative to the body 10, thereby adjusting the lever 31 and the release member 33. The distance between. The spacer 42 is sleeved on the rotating shaft 43 and is respectively arranged between the two ends of the helical tooth 411 and the main body 10. The spacer 42 can prevent the adjustment member 41 from shifting along the third axis L3, as shown in FIG. 5.

Wherein, when the user rotates the dialing area 413 of the adjusting member 41, the engaging area 412 of the adjusting member 41 can drive the end 231 of the first torsion rod 23 to shift relative to the body 10, so as to adjust the lever 31 and the release member of the release device 30 The distance of 33. For example, when the end 231 of the first torsion rod 23 is driven by the adjusting member 41 to move toward the first outer side surface 10a, so that the distance between the lever 31 and the release member 33 is far, the torque wrench 100 applies a larger torque When the value is set to the value, the lever 31 and the release member 33 can be disconnected; on the contrary, when the end 231 of the first torsion bar 23 is driven by the adjusting member 41 to move toward the second outer side surface 10b, the lever 31 and the release member When the distance of 33 is relatively short, the torque wrench 100 only needs to apply a small torque value to allow the lever 31 to touch the release member 33 to cause disconnection. Accordingly, by rotating the adjusting member 41, the torque value of the torque wrench 100 can be set.

The torque sensing device 50 is disposed on the main body 10. The torque sensing device 50 can sense the torque value of the torque wrench 100 and display the torque value by a display 51. In this embodiment, the torque sensing device 50 senses the displacement change of the first torsion rod 23 and displays the torque value on the display 51, so that the user can intuitively understand the current torque value setting state, which is convenient for operation. As shown in FIGS. 2 and 4, the torque sensing device 50 includes the display 51, a circuit board 52, a processing unit 53 and a power supply 54, a sensing element 55, and a sensed element 56. The operation hole 14 and the display 51 are located on the same side of the main body 10. The circuit board 52, the processing unit 53 and the power supply 54 are arranged in the display 51, the display 51 and the processing unit 53 are electrically connected to the circuit board 52, and the display 51 is electrically connected to the sensing element 55, and the sensed element 56 is arranged in the first A torsion rod 23 is displaced with it. In the embodiment of the present invention, the second end 13 of the main body 10 is provided with a sensing hole 16, and the sensing hole 16 is connected to the accommodating space 11 of the main body 10 along a direction parallel to the second axis L2, and the sensing hole 16 It is also substantially parallel to the operating hole 14. Accordingly, the sensing element 55 non-contactly senses the displacement change of the sensed element 56 through the sensing hole 16 to generate a torque signal, and the display 51 displays the torque value according to the torque signal.

It should be noted that the mutual sensing method of the sensing element 55 and the sensed element 56 can also be light sensing or magnetic field sensing. For a light sensor, the sensing element 55 can include light emission and light receiving functions, and the sensed element 56 includes a grating structure. When the sensed element 56 is displaced, light is emitted to the grating structure through the grating structure The corresponding optical characteristics generated by the reflection and shading are received by the sensing element 55 and correspondingly generate an optical signal. The optical signal is processed by the processing unit 53 and converted into a torque signal. The display 51 displays the corresponding torque value to complete The light sensor detects the change of the displacement of the first torsion rod 23. If it is a magnetic field sensor, the sensing element 55 is a magnetic sensor, and the sensed element 56 is a magnet. There is a non-contact fixed gap between the magnetic sensor and the magnet. When the magnet moves with the first torsion bar 23, the magnetic sensor induces The change in the magnetic field between the two generates a corresponding voltage signal, and the processing unit 53 according to the voltage signal The signal can be processed and converted into a torque signal, and the corresponding torque value is displayed on the display 51 to complete the change of the displacement of the magnetic induction first torsion rod 23.

Therefore, the present invention uses non-contact sensing of the displacement change of the first torsion rod 23 to detect the corresponding torque value, so that environmental factors can be avoided to affect the sensing effect, the torque value is accurately displayed, and there is no contact wear problem. , It also increases the life span of use.

In one embodiment of the present invention, the main body 10 further includes a gripping member 17 which is sleeved on the second end 13 of the main body 10 for the user to conveniently hold and operate.

Please refer to FIG. 2 and FIG. 4, in one embodiment, the present invention further includes a holding device 60, the holding device 60 is arranged in the accommodating space 11 along a direction parallel to the second axis L2 and located in the first Between a torsion bar 23 and the body 10. Wherein, the holding device 60 includes a top ball 61 and a spring 62. The end 231 of the first torsion rod 23 is provided with a receiving hole 236 on the side different from the non-circular tooth groove 233. The top ball 61 and the spring 62 are placed in the accommodation. The hole 236 and the spring 62 make the top ball 61 abut against an inner wall 111 of the accommodating space 11 to maintain the meshing state of the adjusting member 41 and the non-perimeter tooth groove 233.

In one embodiment, the present invention further includes a protective cover 70 that can move relative to the main body 10 in a closed position and an open position. With reference to Figure 1, when the protective cover 70 is in the closed position, the protective cover 70 covers the operating hole 14 and the adjusting member 41 to avoid accidental touch and also has the effect of preventing dust; refer to Figure 6, when in the open position, the protective cover The cover 70 is upright, so that the adjusting member 41 is exposed from the main body 10 for the user to operate. In the embodiment of the present invention, the protective cover 70 has a pivoting portion 71 and is pivotally provided on one side of the display 51, and a recessed abutting portion 72 is provided away from the pivoting portion 71. Furthermore, the protective cover 70 further includes a limiting device 73. When in the closed position, the limiting device 73 can limit the rotation of the adjusting member 41. The limiting device 73 includes a J-shaped pressing member 731, and the pressing member 731 has a fixed The end 732 and a pressing end 733, the fixed end 732 is fixed to the protective cover 70, and the pressing end 733 can be elastically pressed against the adjusting member 41 to prevent the adjusting member 41 from rotating and to ensure the accuracy of the torque value.

In one embodiment, the present invention further includes a positioning device 18 disposed between the holding member 17 and the protective cover 70 to keep the protective cover 70 in the closed position. In the embodiment of the present invention, the positioning device 18 includes a limiting member 181 and at least one elastic body 182. The limiting member 181 is U-shaped, the elastic body 182 is two, and the two end legs 181a of the limiting member 181 are in the same direction. The elastic body 182 is arranged in the two fixing holes 171 of the holding member 17, and the elastic body 182 is respectively supported on the end leg 181a of the limiting member 181, so that the limiting member 181 is different from the end leg 181a and one of the abutting edges 181b is facing toward The abutting portion 72 abuts, so that the protective cover 70 is fixedly maintained at the cover position.

As shown in FIG. 8 to FIG. 11, it is the second embodiment of the present invention. The same component numbers as in the first embodiment represent the same components, structures and functions, and will not be repeated in this embodiment. In this embodiment, the torque sensing device 50 further includes an amplifying mechanism 57. The amplifying mechanism 57 is provided on the main body 10 and connected to the first torsion rod 23, the sensed element 56a is provided on the amplifying mechanism 57, and the sensed element 56a The displacement of the first torsion rod 23 is amplified by the amplification mechanism 57, so that the sensing element 55a senses the displacement change.

Wherein, the magnifying mechanism 57 is disposed in the main body 10 and located in the display 51, and the magnifying mechanism 57 includes a swing member 571 and a turntable 572. The swing member 571 is generally fan-shaped, one end of which is swingably disposed in a first through hole 575 of the body 10 through a first pivot 574, and the axis of the first pivot 574 is parallel to the second axis L and perpendicular to the first axis L1 , And the other end of the swing member 571 is provided with a tooth 571a. The swing member 571 is connected to the first torsion bar 23 along a direction parallel to the second axis L2, and can swing relative to the main body 10 with the displacement of the first torsion bar 23, and the turntable 572 is along a direction parallel to the second axis L2 And set in the main body 10. The sensed element 56 a is disposed on the turntable 572, and the turntable 572 can generate a rotating motion along with the swing of the swing member 571.

In this embodiment, the amplifying mechanism 57 further includes a linkage 573. A connecting hole 571b is provided between the two ends of the swinging member 571 for connecting to one end of the linking member 573, and the other end of the linking member 573 extends through an opening slot 576 of the main body 10 and is connected to the hole of the first torsion bar 23 The groove 577 enables the swing member 571 and the first torsion rod 23 to generate a linkage relationship through the linkage member 573, that is, the swing member 571 can swing with the displacement of the first torsion rod 23 and centered on the first pivot 574, wherein the linkage member 573 and the first pivot 574 are arranged in parallel. The turntable 572 is rotated through a second pivot 578 provided in a second perforation 579 of the body 10, the axis of the second pivot 578 is parallel to the second axis L2 and perpendicular to the first axis L1, that is, the second pivot 578 and The first pivot 574 and the linkage 573 are in a parallel relationship with each other. The turntable 572 has a gear portion 572a that meshes with the tooth portion 571a, and the turntable 572 has a disc portion 572b for the sensing element 56a. The disc portion 572b The outer diameter is larger than the gear portion 572a, and the sensed element 56a is substantially disposed on the periphery of the disc portion 572b for the sensing element 55a to sense in a non-contact manner.

Thereby, referring to FIGS. 9A, 9B and 11, when the first torsion rod 23 is displaced, the swing member 571 is oscillated in accordance with the displacement of the first torsion rod 23 through the linkage 573, so that the tooth portion 571a is driven The gear portion 572a rotates, and in this embodiment, the number of teeth of the tooth portion 571a can make the gear portion 572a rotate one revolution. Therefore, when the gear portion 572a is driven one revolution, the disc portion 572b also rotates one revolution. Therefore, the displacement amount of the first torsion bar 23 can be enlarged through the magnifying mechanism 57, thereby obtaining the effect of more precise display of the torque value.

In summary, the present invention has the following advantages:

1. The helical teeth 411 of the adjusting member 41 of the present invention mesh with the non-circular tooth groove 233 of the first torsion bar 23, so that the adjusting member 41 is meshed with the first torsion bar 23 in a partial circle, and accordingly the adjusting member 41 The meshing area with the first torsion rod 23 is small, which can provide the user to quickly and lightly drive the adjusting member 41, so that the user can easily adjust the torque value.

2. The adjusting member 41 of the present invention is exposed to the operating hole 14 of the main body 10, so that the user can hold the main body 10 by hand and directly use the fingers (thumbs) to drive the adjusting member 41, which is quite handy in use. And convenience.

3. The torque sensing device 50 of the present invention adopts non-contact sensing, which can prevent the external environment from affecting the sensing effect, has a long service life, and realizes high-precision torque value setting and judgment.

The torque sensing device 50 of the present invention utilizes the magnifying mechanism 57 to amplify the displacement of the first torsion rod 23, so as to achieve a precise display of the torque value.

The above-mentioned embodiments are only used to illustrate the present invention, and are not used to limit the scope of the present invention. Any modification or change that does not violate the spirit of the present invention falls within the scope of the patent application of the present invention.

100: Torque wrench

10: body

10a: the first outer side

10b: second outer side

11: accommodating space

12: first end

13: second end

14: Operation hole

15: The first pivot hole

16: Sensing hole

17: Grip

171: fixed hole

18: Positioning device

181: limit piece

181a: end foot

181b: Arrival

182: Elastomer

20: Drive

21: Drive

22: Connection part

221: The first set of holes

222: The second set of holes

23: The first torsion bar

231: End

232: The first fixed end

233: Partially round tooth groove

234: second pivot hole

235: Groove

236: accommodating hole

24: second torsion bar

241: second fixed end

242: The first card switch

30: release device

31: Leverage

311: The second card switch

312: Abutment Department

32: Top holder

33: release

34: pin

40: Torque adjustment device

41: Adjusting parts

411: Spiral tooth

42: Spacer

43: shaft

50: Torque sensing device

51: display

52: circuit board

53: processing unit

54: Power

55: sensing element

56: Sensed component

60: holding device

61: top bead

62: Spring

70: Protective cover

71: Pivot

72: Relief

73: limit device

731: Pressure Piece

732: fixed end

733: Pressure End

L1: first axis

L2: second axis

L3: third axis

Claims (16)

A torque wrench with digital display of preset torque, comprising: a body, which is provided with a first end and a second end away from the first end along a first axis, the first end and the second end There is an operating hole, the operating hole is opened to the body along a second axis perpendicular to the first axis; a driving device having a driving portion and a first end of the body respectively extend into the first end A torsion bar and a second torsion bar, the driving part can drive the fastener, the first torsion bar has a non-full circumference tooth groove; a release device is arranged between the first torsion bar and the body And is selectively buckled to the second torsion bar, when the torque wrench drives the fastener to reach a preset torque value, the release device can be disconnected from the second torsion bar; a torque adjusting device can be The torsion adjustment device is rotatably disposed on the body and connected to the first torsion rod. The torsion adjustment device includes an adjustment member that is rotatably disposed on the main body along a third axis perpendicular to the first axis and the second axis And partly exposed in the operating hole, the adjusting member is engaged with the non-full circumference tooth groove to adjust the first torsion bar to be offset relative to the main body; and a torque sensing device is arranged on the main body, the torsion force The sensing device can sense the torque value of the torque wrench and display the torque value on a display. The torque wrench with digital display preset torque according to claim 1, wherein the adjusting member has a helical tooth distributed in its circumferential direction, the non-full-circle tooth groove is a helical tooth groove, and the helical tooth is meshed with the non-circular tooth groove. Full-circle tooth grooves, and the circumferential direction of the adjusting member includes a meshing area located in the body and a dialing area located outside the body. The torque wrench with digital display of preset torque according to claim 2, wherein the non-circular tooth groove is semicircular, and a spacer is provided between the two ends of the spiral tooth and the body. The torque wrench with digital display of preset torque as described in claim 1, further comprising a holding device, the body is provided with an accommodating space, and the holding device is arranged on the first torsion bar and the second axis along the direction of the second axis. Between the main bodies, it is used to maintain the engagement between the adjusting member and the non-circular tooth groove. The torque wrench with digital display preset torque according to claim 4, wherein the first torsion bar has an end, the end has the non-perimeter tooth groove, and is different from the one side of the non-perimeter tooth groove. There is an accommodating hole, the holding device includes a top ball and a spring, the top ball and the spring are arranged in the accommodating hole, and the spring makes the top ball abut against an inner wall of the accommodating space. The torque wrench with digital display of preset torque as described in claim 4 further includes a protective cover which can move in a closed position and an open position relative to the main body. When in the closed position, the protective cover covers the When the operating hole and the adjusting member are in the open position, the adjusting member can be operated by the user. The torque wrench with digital display of preset torque as described in claim 6, further includes a limit device, which can limit the rotation of the adjusting member when in the closed position. The torque wrench with digital display preset torque according to claim 7, wherein the limiting device includes a pressing member having a fixed end and a pressing end, and the fixed end is fixed to the protective cover The pressing end can be elastically pressed against the adjusting member; the protective cover has a pivotal portion and is pivotally arranged on one side of the display. The torque wrench with digital display preset torque as described in claim 8, further comprising a positioning device, the body includes a holding piece sleeved on the second end, the positioning device being arranged on the holding piece and the protective cover Between, the protective cover is kept in the cover position; the protective cover has a pivotal part and is pivotally arranged on one side of the display, the protective cover is provided with a supporting part away from the pivotal part, the positioning The device includes a limiting member and at least one elastic body. The elastic body is supported on the limiting member so that the limiting member abuts against the abutting portion. The torque wrench with digital display of preset torque according to claim 9, wherein the operating hole and the display are located on the same side of the body. The torque wrench with digital display preset torque according to claim 10, wherein the torque sensing device has a sensing element and a sensed element, the display is electrically connected to the sensing element, and the sensed element The element can be displaced with the first torsion bar, the sensing element can non-contactly sense the displacement change of the sensed element to generate a torsion signal, and the display displays the torque value according to the torsion signal. The torque wrench with digital display of preset torque according to claim 11, wherein the torque sensing device includes a circuit board, a processing unit and a power supply, and the circuit board, the processing unit and the power supply are arranged in the display , The processing unit and the display are electrically connected to the circuit board, the second end of the body is provided with a sensing hole, the sensing hole is communicated with the body, and the sensed element is provided on the first torsion bar, The sensing element senses the sensed element through the sensing hole. The torque wrench with digital display preset torque according to claim 11, wherein the torque sensing device includes a circuit board, a processing unit, a power supply and an amplifying mechanism, the circuit board, the processing unit and the power supply device In the display, the processing unit and the display are electrically connected to the circuit board, the amplifying mechanism is provided on the main body and connected to the first torsion bar, and the sensed element is provided on the amplifying mechanism, and the sensing element is provided on the amplifying mechanism. The element senses the change in displacement. The torque wrench with digital display preset torque according to claim 13, wherein the amplifying mechanism includes a swing member and a turntable. It is connected to the first torsion bar in a direction parallel to the second axis, and can swing relative to the main body with the displacement of the first torsion bar, and the turntable is disposed on the first torsion bar along a direction parallel to the second axis. In the main body, the sensed element is arranged on the turntable, and the turntable can generate a rotating action with the swing of the swinging member. The torque wrench with digital display preset torque according to claim 14, wherein the magnifying mechanism is provided in the main body and located in the display, and the axis of the first pivot is parallel to the second axis and perpendicular to the first axis , The other end of the oscillating member is provided with a tooth portion, and the oscillating member is connected to one end of a linkage member, and the other end of the linkage member extends through an opening slot of the body to be connected to the first torsion bar, and the The linkage is arranged in parallel with the first pivot; the turntable is rotatably arranged on the body via a second pivot, the axis of the first pivot is parallel to the second axis and perpendicular to the first axis, the turntable It has a gear part to mesh with the tooth part, and the turntable has a disc part for the sensing element to be arranged. The torque wrench with digital display preset torque as described in claim 12 or 14, wherein the first torsion bar and the second torsion bar can be respectively elastically bent when the torque wrench is pulled, and the second torsion bar is The length is less than the length of the first torsion bar, the driving device is different from the driving part and is provided with a connecting part, the connecting part has a first set of holes and a second set of holes arranged side by side, the first torsion rod is far away The end is provided with a first fixed end connected to the first set of holes, the second torsion bar has a second fixed end and a first catch, the second fixed end is connected to the second set of holes, The first latch is buckled with the release device; the release device includes a lever, a holding member, and a release member. The lever is pivoted to the first torsion rod and can be positioned at a first position and a release member. Move between the second position, in the first position, the lever is buckled with the first latch, the release device is in a holding state, in the second position, the lever is disconnected from the first latch Open, the release device is in the disconnected state; the lever has a second latching portion and an abutting portion, and the holding member is elastically arranged between the abutting portion and the first torsion rod for The second latching portion is kept buckled on the first latching portion to be located at the first position, the release member is arranged on the body, and when the torque wrench reaches the preset torque value, the release member It can abut against the lever to prompt the first latching portion and the second latching portion to produce the disconnected state.

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