torque wrench

Abstract

Torque wrench, the wrench comprising the following components: a manual torque release device (63); an electric rotary device (64), wherein the electric rotary device (64) comprises the following components: a trigger body (6) which is connected to the output end of the manual torque release device, wherein a trigger rotary hole (8) is arranged inside the trigger body (6); a ratchet wheel (9) which is arranged to rotate in the trigger pivot hole (8), wherein ratchet wheel teeth are arranged on the outer circumference of the ratchet wheel (9); a first pawl arrangement located between the trigger body and the ratchet wheel to limit the rotation of the ratchet wheel (9) in only one direction; an electric drive device arranged on the trigger body (6) to drive the rotation of the ratchet wheel (9).

Description

[0001] The present invention relates to the technical field of wrenches, in particular to a torque wrench.

[0002] The wrench is a commonly used assembly and disassembly tool. It is a hand tool used to turn bolts, screws, nuts, and other openings or bushings of threaded fasteners using the lever principle.

[0003] Currently, when applying torque with a torque wrench, the required torque value must usually be set first. When the operator turns the wrench to the required torque value, the mechanical release mechanism inside the torque wrench makes a knocking noise and produces a slight vibration to prompt the operator to stop applying force.

[0004] However, when tightening bolts with the aforementioned torque wrench, it tends to swing continuously back and forth, resulting in relatively low efficiency.

[0005] The object of the present invention is to provide a torque wrench that enables more efficient tightening of screws.

[0006] To solve the aforementioned problem, the following technical solutions are provided according to the present invention: Torque wrench, comprising: a manual torque release device; an electric rotary device, wherein the electric rotary device comprises the following components: a trigger body connected to the output end of the manual torque release device, wherein a trigger rotary hole is arranged within the trigger body; a ratchet wheel which is arranged to rotate in the trigger hole, wherein ratchet wheel teeth are arranged on the outer circumference of the ratchet wheel; a first pawl arrangement located between the trigger body and the ratchet wheel to limit the rotation of the ratchet wheel in only one direction; an electric drive device arranged on the trigger body to drive the rotation of the ratchet wheel.

[0007] Furthermore, the electric drive unit is designed to include the following components: a drive motor; a transmission mechanism for connecting the output shaft of the drive motor to the ratchet wheel, so that power is transmitted to the ratchet wheel, the transmission mechanism comprising the following components: a rotary gear, wherein a drive rotary groove is arranged on the inner wall of the trigger rotary hole, wherein the rotary gear is mounted in the drive rotary groove, wherein the rotary gear is encased on the outside of the ratchet wheel, wherein a driven connecting tooth is arranged on the rotary gear; a connecting sleeve, wherein the connecting sleeve is attached between the manual torque release device and the trigger body, wherein a connecting groove is arranged inside the connecting sleeve, wherein a trigger perforation is arranged on the trigger body, wherein the trigger perforation is used to connect the trigger rotation hole with the connecting groove, wherein the drive motor is attached in the connecting groove; a drive rotary shaft, wherein the drive rotary shaft passes through the trigger perforation, wherein one end of the drive rotary shaft is connected to the rotary shaft of the drive motor and the other end is provided with a driven connecting tooth, wherein the driven connecting tooth is in engagement with the driven connecting tooth; a second pawl assembly, wherein a second mounting groove is arranged on the rotary gear, wherein a second pawl assembly is mounted in the second mounting groove, wherein the rotation of the pawl wheel is not restricted by the first pawl assembly when the rotation of the pawl wheel by the second pawl assembly is driven by the rotary gear; a control device, wherein the control device is provided for controlling the rotation of the drive motor's rotating shaft.

[0008] Furthermore, it is provided that the first pawl assembly comprises a first pawl and a first elastic element, wherein a first mounting groove is arranged within the trigger body, the first mounting groove comprising a small end and a large end, the width of the small end being less than the width of the large end, the first pawl comprising a small end and a large end, the small end being inserted into the small end of the first mounting groove, the first elastic element tending to drive the large end of the first pawl towards the small end of the first mounting groove, and the first pawl having a first pawl tooth that engages with the pawl wheel tooth.

[0009] Furthermore, it is provided that the first elastic element is designed as a first torsion spring, wherein the first torsion spring comprises a first slotted insertion end and a first claw insertion end, wherein a first slotted insertion hole is arranged at the bottom of the first mounting groove, wherein a first claw insertion groove is arranged at the large end of the first pawl of the first pawl, wherein the first slotted insertion end is inserted into the first slotted insertion hole, wherein the first claw insertion end is inserted into the first claw insertion groove, wherein the first elastic element tends to drive the large end of the first pawl to move towards the small end of the first mounting groove.

[0010] Furthermore, it is provided that the second pawl assembly comprises a second pawl and a second elastic element, wherein the second mounting groove comprises a small end of the second mounting groove and a large end of the second mounting groove, wherein the width of the small end of the second mounting groove is smaller than the width of the large end of the second mounting groove, wherein the second pawl comprises a small end of the second pawl and a large end of the second pawl, wherein the small end of the second pawl is inserted into the small end of the second mounting groove, wherein the second elastic element tends to drive the large end of the second pawl to move towards the small end of the second mounting groove, wherein a second pawl tooth is arranged on the second pawl which engages with the pawl wheel tooth.

[0011] Furthermore, it is provided that the second elastic element is designed as a second torsion spring, wherein the second torsion spring comprises a second slotted insertion end and a second claw insertion end, wherein a second slotted insertion hole is arranged at the bottom of the second mounting groove, wherein a second claw insertion groove is arranged at the large end of the second pawl of the second pawl, wherein the second slotted insertion end is inserted into the second slotted insertion hole, wherein the second claw insertion end is inserted into the second claw insertion groove, wherein the second elastic element tends to drive the large end of the second pawl to move towards the small end of the second mounting groove.

[0012] Furthermore, it is provided that a reduction device for a planetary gear unit is further comprising a reduction device for a planetary gear unit having a reduction input and a reduction output, wherein the reduction device for a planetary gear unit is rigidly connected to the drive motor, wherein the reduction input is rigidly connected to the drive motor's rotating shaft, and wherein the reduction output is rigidly connected to the drive rotating shaft.

[0013] Furthermore, the manual torque release device is designed to include the following components: a handle tube, wherein an axially extending handle perforation is arranged within the handle tube; an ejector pin seat which is arranged to slide within the handle perforation; a torsion shaft, wherein the first connecting end of the torsion shaft projects into the handle perforation and is rotatably connected to the handle tube; a torque adjustment mechanism to apply a preload force to the ejector pin seat in the direction of the torsion shaft; a torque release arrangement located between the torsion shaft and the ejector pin seat; wherein the trigger body is firmly connected to the second connecting end of the torsion shaft.

[0014] Furthermore, it is provided that the control device comprises a battery and a circuit board, wherein the battery and the circuit board are fixed in the connecting groove, and wherein the drive motor is electrically connected to the battery and the circuit board.

[0015] Furthermore, the manual torque release device is designed to include the following components: a torsion tube, wherein a torsion connection hole is arranged in the torsion tube; a torsion stabilizing shaft, wherein one end of the torsion stabilizing shaft is inserted into the torsion connection hole and is firmly connected to the torsion tube and the other end is firmly connected to the pull-off body, wherein two mounting recesses are arranged opposite each other on the torsion stabilizing shaft, each with strain gauges attached in the two mounting recesses; a printed circuit board assembly, wherein the printed circuit board assembly is electrically connected to the strain gauge.

[0016] In comparison to the prior art, the present invention has the following advantageous effects: (1) The majority of the lengthy and lower-torque tightening stroke is performed in electric mode using this torque wrench to improve work efficiency. Finally, manual tightening is carried out, allowing the required torque to be applied manually. (2) Only a small torque needs to be applied to the electric drive device, so that the volume of the electric drive device can be made small. (3) The first pawl assembly and the second pawl assembly are cleverly used for the entire device so that automatic switching and mutual non-interference between two power modes, for example electric and manual, are realized. Fig. Figure 1 shows a schematic representation of the structure of a torque wrench according to an embodiment of the present invention. Fig. 2 shows a view from above. Fig. 1. Fig. Figure 3 shows a section of AA in Fig. 2. Fig. Figure 4 shows a partially enlarged view of I in Fig. 3. Fig. Figure 5 shows an exploded view of a torque delivery mechanism. Fig. Figure 6 shows a schematic representation of the connection structure of a second pawl arrangement with a pawl wheel. Fig. Figure 7 shows a schematic representation of the connection structure of a first pawl arrangement with a pawl wheel. Fig. Figure 8 shows a partially enlarged view of II in Fig. 3. Fig. Figure 9 shows a partially enlarged view of III in Fig. 3. Fig. Figure 10 shows a partially enlarged view of IV in Fig. 3. Fig. Figure 11 shows an exploded view of an electric drive unit. Fig. Figure 12 shows a schematic representation of the structure of a torsional wave. Fig. Figure 13 shows a structural representation of an ejector pin seat and a connecting block. Fig. Figure 14 shows a schematic representation of the structure of a torque wrench according to a further embodiment of the present invention. Fig. 15 shows a sectional view after Fig. 14. Fig. Figure 16 shows a representation of the installation position of a strain gauge.

[0017] According to the invention, a technical solution for a torque wrench is provided, with reference to Fig. 1 to Fig. 16.

[0018] Torque wrench, comprehensive: a manual torque release device 63; an electric rotary device 64, wherein the electric rotary device 64 comprises the following components: a trigger body 6 which is connected to the output end of the manual torque release device 63, wherein a trigger rotary hole 8 is arranged inside the trigger body 6; a ratchet wheel 9 which is arranged to rotate in the trigger pivot hole 8, wherein ratchet wheel teeth 10 are arranged on the outer circumference of the ratchet wheel 9; a first pawl arrangement located between the trigger body 6 and the pawl wheel 9 to limit the rotation of the pawl wheel 9 in only one direction; an electric drive device arranged on the trigger body 6 to drive the rotation of the ratchet wheel 9.

[0019] This torque wrench aims to combine the high efficiency of a power tool with the torque requirements of a manual torque wrench. Its use is primarily divided into the following steps: Step 1: Preparation

[0020] Torque value setting: The torque adjustment mechanism of the manual torque release device 63 is set and the inner ejector pin seat 3 is compressed or released so that the desired preset torque value is set. Step 2: Electrical pre-tensioning phase

[0021] Positioning: The inner slot of the ratchet wheel 9 is placed over the bolts / nuts.

[0022] Start of the electric drive: The electric drive is started to rotate the ratchet wheel 9 and thus begin tightening the bolts / nuts. Note: During this phase, the first pawl assembly is in a slip state (i.e., it allows rotation of the ratchet wheel 9 in the tightening direction), which does not impede the electric drive.

[0023] Preload up to near the torque value: The electric drive is stopped. Step 3: Control phase with manual precise tightening to the final torque

[0024] Switching to manual mode: After the electric drive has been stopped, the trigger body 6 must be manually swivelled by the operator to complete the final, precise application of torque.

[0025] Manual force application: A force is applied to the manual torque release device 63. This force at the output end of the manual torque release device 63 ultimately drives the rotation of the trigger body 6. The bolt is tightened by means of the trigger body 6 via the first pawl assembly and the pawl wheel 9.

[0026] Torque release and warning: Force continues to be applied. When the torque applied to the bolt reaches the torque value specified in step 1, the manual torque release device 63 issues an early warning signal. This indicates that the specified torque has been reached and the application of force should be stopped immediately. At this point, the bolt is tightened precisely to the specified torque.

[0027] The majority of the lengthy and low-torque tightening stroke is performed electrically by this torque wrench, significantly reducing operator workload and improving efficiency. Finally, manual tightening is performed, allowing for the application of higher and required torque. Only a small amount of torque is required by the electric drive unit, enabling a compact design of the unit.

[0028] The manual torque release device 63 can be integrated into an existing torque wrench. When the torque applied to the bolt by the manual torque release device 63 reaches a predetermined torque value, the manual torque release device 63 emits an early warning signal to prompt the user to stop rotation. This early warning signal can be a noise produced by a collision of components, or it can be a vibration signal or a prompting noise produced by electricity.

[0029] Furthermore, the electric drive unit is designed to include the following components: a drive motor 14; a transmission mechanism for connecting the output shaft of the drive motor 14 to the ratchet wheel 9, so that power is transmitted to the ratchet wheel 9, the transmission mechanism comprising the following components: a rotary gear 15, wherein a drive rotary groove 16 is arranged on the inner wall of the trigger rotary hole 8, wherein the rotary gear 15 is mounted in the drive rotary groove 16, wherein the rotary gear 15 is encased on the outside of the ratchet wheel 9, wherein a driven connecting tooth 17 is arranged on the rotary gear 15; a connecting sleeve 18, wherein the connecting sleeve 18 is attached between the manual torque release device 63 and the trigger body 6, wherein a connecting groove 19 is arranged inside the connecting sleeve 18, wherein a trigger perforation 20 is arranged on the trigger body 6, wherein the trigger perforation 20 is used to connect the trigger rotary hole 8 with the connecting groove 19, wherein the drive motor 14 is attached in the connecting groove 19; a drive shaft 21, wherein the drive shaft 21 passes through the trigger perforation 20, wherein one end of the drive shaft 21 is connected to the drive shaft of the drive motor 14 and the other end is provided with a driven connecting tooth 22, wherein the driven connecting tooth 22 engages with the driven connecting tooth 17; a second pawl arrangement, wherein a second mounting groove 23 is arranged on the rotary gear 15, wherein a second pawl arrangement is mounted in the second mounting groove 23, wherein the rotation of the pawl wheel 9 is not restricted by the first pawl arrangement when the rotation of the pawl wheel 9 by the second pawl arrangement is driven by the rotary gear 15; a control device, wherein the control device is provided for controlling the rotation of the rotating shaft of the drive motor 14.

[0030] The following describes the operating principle of the electric drive device described above: 1. Electric drive mode (pulling): Start: The drive motor 14 is started by the control unit. Transmission: The rotary gear 15, which engages with it, is driven by the motor via the driven connecting tooth 22 at the end of the drive shaft 21. One-way drive: The second pawl assembly on the inside of the rotary gear 15 engages with the pawl teeth 10 of the ratchet wheel 9 when it rotates, thereby pulling the ratchet wheel 9 into rotation to deliver a torque. At this point, the first pawl assembly on the trigger body 6 slides onto the pawl teeth 10, which does not impede electrical operation. 2. Electric Stop / Manual Mode: Drive stop: The engine is stopped. Manual operation: At this point, a manual pivot can be performed, whereby the ratchet wheel 9 is pressed by the first ratchet assembly to achieve the final, precise tightening. During manual operation, the second ratchet assembly slides on the ratchet wheel teeth 10, creating no obstruction.

[0031] The first pawl arrangement and the second pawl arrangement are cleverly used for the entire device, so that automatic switching and mutual non-interference between two power modes, for example electric and manual, are realized.

[0032] An embodiment of the first pawl assembly is shown below. The first pawl assembly further comprises a first pawl 24 and a first elastic element, wherein a first mounting groove 25 is arranged within the trigger body 6, the first mounting groove 25 comprising a small end 26 and a large end 27, the width of the small end 26 being less than the width of the large end 27, the first pawl 24 comprising a small end 28 and a large end 29, the small end 28 being inserted into the small end 26 of the first mounting groove, and the first elastic element tending to drive the large end 29 of the first pawl towards the small end 26 of the first mounting groove.wherein a first pawl tooth is arranged on the first pawl 24, which engages in the pawl wheel tooth 10, wherein there is a gap between the large end 27 of the first mounting groove and the large end 29 of the first pawl, wherein the side of the first pawl 24 facing away from the pawl wheel 9 is formed as a first arcuate surface 71, wherein an associated arcuate inner wall is arranged on the inner wall of the first mounting groove 25, as in , Fig. 7 shown.

[0033] Furthermore, it is provided that the first elastic element is designed as a first torsion spring 30, wherein the first torsion spring 30 comprises a first slotted insertion end 31 and a first claw insertion end 32, wherein a first slotted insertion hole 33 is arranged at the bottom of the first mounting groove 25, wherein a first claw insertion groove 34 is arranged at the large end 29 of the first pawl of the first pawl 24, wherein the first slotted insertion end 31 is inserted into the first slotted insertion hole 33, wherein the first claw insertion end 32 is inserted into the first claw insertion groove 34, wherein the first elastic element tends to drive the large end 29 of the first pawl to move towards the small end 26 of the first mounting groove, as shown in Fig. 7 shown.

[0034] This first pawl arrangement allows the ratchet wheel 9 to rotate freely in one direction while locking it in the opposite direction. When the ratchet wheel 9 rotates freely in one direction, the pawl wheel teeth 10 press against the first pawl teeth. This pressing force overcomes the force of the first torsion spring 30 and forces the large end 29 of the first pawl toward the large end 27 of the first mounting groove, allowing the pawl wheel teeth 10 to slide smoothly past with a clicking sound. When the ratchet wheel 9 needs to be rotated in the opposite direction, the pawl wheel teeth 10 press against the first pawl teeth. The small end 28 of the first pawl is clamped within the small end 26 of the first mounting groove to lock the ratchet wheel 9.

[0035] Similarly, the second pawl assembly comprises a second pawl 35 and a second elastic element, wherein the second mounting groove 23 includes a small end 36 of the second mounting groove and a large end 37 of the second mounting groove, the width of the small end 36 of the second mounting groove being smaller than the width of the large end 37 of the second mounting groove, wherein the second pawl 35 comprises a small end 38 of the second pawl and a large end 39 of the second pawl, the small end 38 of the second pawl being inserted into the small end 36 of the second mounting groove, the second elastic element tending to drive the large end 39 of the second pawl to move towards the small end 36 of the second mounting groove, and wherein a second pawl tooth is arranged on the second pawl 35, which engages with the pawl wheel tooth 10.wherein the side of the second pawl 35 facing away from the ratchet wheel 9 is designed as a second arcuate surface 72, wherein an associated arcuate inner wall is arranged on the inner wall of the second mounting groove 23, as shown in , Fig. 6 shown.

[0036] Furthermore, it is provided that the second elastic element is designed as a second torsion spring 40, wherein the second torsion spring 40 comprises a second slotted insertion end 41 and a second claw insertion end 42, wherein a second slotted insertion hole 43 is arranged at the bottom of the second mounting groove 23, wherein a second claw insertion groove 44 is arranged at the large end 39 of the second pawl of the second pawl 35, wherein the second slotted insertion end 41 is inserted into the second slotted insertion hole 43, wherein the second claw insertion end 42 is inserted into the second claw insertion groove 44, wherein the second elastic element tends to drive the large end 39 of the second pawl to move towards the small end 36 of the second mounting groove, as shown in Fig. 6 shown.

[0037] When tightening is required, the drive motor 14 rotates the gear 15, and the second pawl tooth of the second pawl 35 thereby pulls the ratchet wheel 9 into rotation. When the wrench is manually pivoted for tightening, the ratchet wheel 9 is forced into rotation by the first pawl 24. At this point, the teeth of the ratchet wheel 9 push the teeth of the second pawl 35 away and force the movement of the second pawl 35 against the force of the second elastic element towards the large end 37 of the second mounting groove, which does not impede the tightening of the bolt.

[0038] Furthermore, it is provided that the torque wrench also comprises a reduction device 45 for a planetary gear, wherein the reduction device 45 for a planetary gear has a reduction input and a reduction output, wherein the reduction device 45 for a planetary gear is fixedly connected to the drive motor 14, wherein the reduction input is fixedly connected to the drive shaft of the drive motor 14, and wherein the reduction output is fixedly connected to the drive shaft 21.

[0039] The rotation of the drive shaft 21 is driven by the drive motor 14 via the reduction gear 45 for a planetary gearbox, such that the output torque is increased. The specific structure of the existing reduction mechanism of the reduction gear 45 for a planetary gearbox will not be explained in detail.

[0040] The following is an embodiment of the manual torque release device 63, comprising: a handle tube 1, wherein an axially extending handle perforation 2 is arranged inside the handle tube 1; an ejector pin seat 3 which is arranged to slide within the handle perforation 2; a torsion shaft 4, wherein the first connecting end 5 of the torsion shaft 4 projects into the handle perforation 2 and is rotatably connected to the handle tube 1; a torque adjustment mechanism to apply a preload force to the ejector pin seat 3 in the direction of the torsion shaft 4; a torque release arrangement located between the torsion shaft 4 and the ejector pin seat 3; wherein the trigger body 6 is firmly connected to the second connecting end 7 (output end) of the torsion shaft 4.

[0041] The torque adjustment mechanism at the end of the handle tube 1 is set, and the inner ejector pin seat 3 is compressed or released to set the desired preset torque value. When the torque applied to the bolt reaches the torque value specified in step 1, the torque release mechanism is activated. A distinct click is heard, indicating that the preset torque has been reached and that the force should be stopped immediately. At this point, the bolt is tightened precisely to the preset torque.

[0042] Furthermore, the torque release assembly is designed to have the following components, as shown in Fig. 9, Fig. 12 and Fig. 13 shown: a first recess 11, which is formed at the first connection end 5 of the torsion shaft 4; a second recess 12, which is formed at one end of the ejector pin seat 3 near the torsion shaft 4; a connecting block 13 which is arranged between the first recess 11 and the second recess 12.

[0043] If the torsional force generated by the torque is greater than the preload force exerted by the torque adjustment mechanism on the ejector pin seat 3, the connecting block 13 can no longer be held over the ejector pin seat 3. Under this pressure, the connecting block 13 instantly slips, causing a noise due to the collision of the connecting block 13 with the handle tube 1. After the wrench is released, the applied force disappears, allowing the connecting block 13 to return between the first recess 11 and the second recess 12.

[0044] An embodiment of the torque adjustment mechanism is shown below. Furthermore, the torque adjustment mechanism is provided to have the following components, as shown in Fig. 9 and Fig. 10 shown: a retaining spring 46, wherein the retaining spring 46 is mounted within the handle perforation 2, wherein the retaining spring 46 is located at one end of the ejector pin seat 3 facing away from the torsion shaft 4; a retaining seat 48, wherein the retaining seat 48 is mounted within the handle perforation 2, wherein the retaining seat 48 is located at an end of the retaining spring 46 facing away from the ejector pin seat 3; an outer sleeve 49, wherein the outer sleeve 49 is encased on the handle tube 1, wherein the outer sleeve 49 is rotatable relative to the handle tube 1, wherein a retaining ring 50 is secured in the outer sleeve 49; an adjusting screw 51, wherein the adjusting screw 51 is secured with the retaining ring 50, wherein one end of the adjusting screw 51 rests against one end of the retaining seat 48 facing away from the retaining spring 46; an adjusting ring 52, wherein the adjusting ring 52 is fixed within the handle perforation 2, wherein an adjusting internal thread is arranged in the inner bore of the adjusting ring 52, wherein the adjusting internal thread is screwed to the adjusting screw 51.

[0045] During adjustment, the outer sleeve 49 can be rotated to drive a movement of the adjusting screw 51 relative to the retaining spring 46. This adjusts the holding force of the retaining seat 48 against the retaining spring 46 so that the desired torque is achieved.

[0046] Furthermore, the control device comprises a battery 53 and a circuit board 47, the battery 53 and the circuit board 47 being mounted in the connecting groove 19, with the drive motor 14 being electrically connected to the battery 53 and the circuit board 47. The arrangement of the battery 53 eliminates the need for an external power supply, which is more convenient. Control switches connected to the circuit board 47 can be arranged on the connecting sleeve 18 or on the outer sleeve 49, so that the rotation of the drive motor 14 is controlled by the control switch. If the control switch is arranged on the outer sleeve 49, it is preferably used for wireless control of the rotation of the drive motor 14.

[0047] Furthermore, it is provided that a first connecting groove 54 is arranged on one side of the trigger body 6, wherein the first mounting groove 25 is arranged on the bottom surface of the first connecting groove 54, wherein a first connecting ring 55 is mounted within the first connecting groove 54, wherein a first connecting outer ring groove 56 is arranged on the inner wall of the first connecting ring 55, wherein a first connecting inner ring groove 57 is arranged at one end of the ratchet wheel 9, wherein a first snap ring 58 is encased in the first connecting inner ring groove 57, wherein the first connecting outer ring groove 56 is fitted onto the outer end of the first snap ring 58, wherein the first connecting ring 55 is rotatable relative to the first connecting groove 54, as shown in Fig. 4 and Fig. 7 shown.

[0048] Furthermore, it is provided that the second mounting groove 23 is arranged on a side of the trigger body 6 facing away from the first mounting groove 25, the second mounting groove 23 penetrating this side, a second connecting ring 62 being mounted within the second mounting groove 23, the second connecting ring 62 being arranged on the outside of the rotary gear 15, a second outer ring groove 60 being arranged on the inner wall of the second connecting ring 62, a second inner ring groove 61 being arranged at an end of the ratchet wheel 9 facing away from the first connecting ring 55, a second snap ring 59 being encased in the second inner ring groove 61, the second outer ring groove 60 being fitted onto the outer end of the second snap ring 59, the second connecting ring 62 being rotatable relative to the second mounting groove 23 as shown in Fig. 4 and Fig.6 shown. The arrangement of the first connecting ring 55 and the second connecting ring 62 achieves a rotation of the ratchet wheel 9 relative to the trigger body 6.

[0049] The rotary gear 15 is designed as a spur gear. The driven connecting tooth 22 on the drive shaft 21 engages with the driven connecting tooth 17 on the spur gear. The axis of the drive shaft 21 is perpendicular to the axis of the rotary gear 15. Several first pawl assemblies can be arranged, with the several first pawl assemblies being evenly distributed around the circumference of the ratchet wheel 9. Similarly, several second pawl assemblies can be arranged, with the several second pawl assemblies being evenly distributed around the circumference of the ratchet wheel 9.

[0050] The following is another embodiment of the manual torque release device 63. Furthermore, the manual torque release device 63 is provided to have the following components: a torsion tube 65, wherein a torsion connection hole 66 is arranged in the torsion tube 65; a torsion stabilizing shaft 67, wherein one end of the torsion stabilizing shaft 67 is inserted into the torsion connection hole 66 and is firmly connected to the torsion tube 65 and the other end is firmly connected to the pull-off body 6, wherein two mounting recesses 68 are arranged opposite each other on the torsion stabilizing shaft 67, wherein strain gauges 69 are attached in each of the two mounting recesses 68; a printed circuit board assembly 70, wherein the printed circuit board assembly 70 is electrically connected to the strain gauge 69.

[0051] The torsion tube 65 is held in place when the bolts need to be tightened manually. Rotating the torsion tube 65 drives the rotation of the trigger body 6, and the rotation of the bolt is driven by the trigger body 6 via the ratchet wheel 9. The strain gauge 69 causes deformation within the torsion tube 65. The magnitude of this deformation is converted into a corresponding torque reading for display on the screen of the printed circuit board assembly 70. When the torque reaches the set torque, the printed circuit board assembly 70 emits an early warning signal. This early warning signal is not limited to a vibration signal or a warning horn sound, or the like. Reference symbol list 1 handle tube 2 handle perforations 3 Ejector pin seat 4 Torsion shaft 5 First connection end 6 extraction bodies 7 Second connection end 8 trigger rotary hole 9 ratchet wheel 10 pawl wheel teeth 11 First Exclusion 12 Second Exclusion 13 Connecting block 14 Drive motor 15 Rotary gear 16 Drive rotary groove 17 Worn-off connecting tooth 18 Connecting sleeve 19 Connecting groove 20 trigger perforations 21 Drive shaft 22 Driven connecting tooth 23 Second mounting groove 24 First locking pawl 25 First mounting groove 26 Small end of the first mounting groove 27 Large end of the first mounting groove 28 Small end of the first locking pawl 29 Large end of the first locking pawl 30 First torsion spring 31 First slot insertion end 32 First claw insertion 33 First slotted hole 34 First claw insertion groove 35 Second locking pawl 36 Small end of the second mounting groove 37 Large end of the second mounting groove 38 Small end of the second locking pawl 39 Large end of the second locking pawl 40 Second torsion spring 41 Second slot insert end 42 Second claw insertion end 43 Second slotted hole 44 Second claw slot 45 Reduction device for a planetary gearbox 46 Retaining spring 47 Circuit board 48 Holddown seat 49 Outer sleeve 50 retaining rings 51 Adjusting screw 52 Adjustment ring 53 Battery 54 First connecting groove 55 First connecting ring 56 First connecting outer ring groove 57 First connecting inner ring groove 58 First snap ring 59 Second snap ring 60 Second outer ring groove 61 Second inner ring groove 62 Second connecting ring 63 Manual torque release device 64 Electric rotary device 65 Torsion tube 66 Torsion connection hole 67 Torsion stabilization shaft 68 Mounting recess 69 strain gauges 70 Printed circuit board assembly 71 First arc-shaped surface 72 Second arc-shaped surface

Claims

[1] Torque wrench, the wrench comprising the following components: a manual torque release device (63); an electric rotary device (64), wherein the electric rotary device (64) comprises the following components: a trigger body (6) which is connected to the output end of the manual torque release device, wherein a trigger rotary hole (8) is arranged inside the trigger body (6); a ratchet wheel (9) which is arranged to rotate in the trigger pivot hole (8), wherein ratchet wheel teeth are arranged on the outer circumference of the ratchet wheel (9); a first pawl arrangement located between the trigger body and the ratchet wheel to limit the rotation of the ratchet wheel (9) in only one direction; an electric drive device arranged on the trigger body (6) to drive the rotation of the ratchet wheel (9). [2] Torque wrench according to claim 1, characterized by , that the electric drive unit has the following components: a drive motor (14); a transmission mechanism for connecting the output shaft of the drive motor to the ratchet wheel (9) so that power is transmitted to the ratchet wheel (9), the transmission mechanism comprising the following components: a rotary gear (15) wherein a drive rotary groove (16) is arranged on the inner wall of the trigger rotary hole, wherein the rotary gear (15) is mounted in the drive rotary groove (16), wherein the rotary gear (15) is encased on the outside of the ratchet wheel, wherein a driven connecting tooth (17) is arranged on the rotary gear (15); a connecting sleeve (18), wherein the connecting sleeve (18) is attached between the manual torque release device and the trigger body, wherein a connecting groove (19) is arranged inside the connecting sleeve (18), wherein a trigger perforation (20) is arranged on the trigger body, wherein the trigger perforation (20) is used to connect the trigger rotation hole with the connecting groove (19), wherein the drive motor is attached in the connecting groove (19); a drive rotary shaft (21), wherein the drive rotary shaft (21) passes through the pull-out perforation (20), wherein one end of the drive rotary shaft (21) is connected to the rotary shaft of the drive motor and the other end is provided with a driven connecting tooth, wherein the driven connecting tooth is in engagement with the driven connecting tooth; a second pawl arrangement, wherein a second mounting groove (23) is arranged on the rotary gear (15), wherein a second pawl arrangement is mounted in the second mounting groove (23), wherein the rotation of the pawl wheel is not restricted by the first pawl arrangement when the rotation of the pawl wheel by the second pawl arrangement is driven by the rotary gear (15); a control device, wherein the control device is provided for controlling the rotation of the drive motor's rotating shaft. [3] Torque wrench according to claim 1 or 2, characterized by, that the first pawl assembly comprises a first pawl and a first elastic element, wherein a first mounting groove (25) is arranged within the trigger body, wherein the first mounting groove (25) comprises a small end of the first mounting groove (26) and a large end of the first mounting groove (27), wherein the width of the small end of the first mounting groove is less than the width of the large end of the first mounting groove, wherein the first pawl comprises a small end of the first pawl (28) and a large end of the first pawl (29), wherein the small end of the first pawl is inserted into the small end of the first mounting groove, wherein the first elastic element tends to drive the large end of the first pawl to move towards the small end of the first mounting groove, wherein a first pawl tooth is arranged on the first pawl which engages with the pawl wheel tooth (10). [4] Torque wrench according to claim 3, characterized by , that the first elastic element is configured as a first torsion spring (30), wherein the first torsion spring (30) comprises a first slotted insertion end and a first claw insertion end, wherein a first slotted insertion hole (33) is arranged at the bottom of the first mounting groove, wherein a first claw insertion groove (34) is arranged at the large end of the first pawl of the first pawl, wherein the first slotted insertion end is inserted into the first slotted insertion hole, wherein the first claw insertion end is inserted into the first claw insertion groove (34), wherein the first elastic element tends to drive the large end of the first pawl to move towards the small end of the first mounting groove. [5] Torque wrench according to any one of claims 2 to 4, characterized by, that the second pawl assembly comprises a second pawl and a second elastic element, wherein the second mounting groove (23) comprises a small end of the second mounting groove (36) and a large end of the second mounting groove (37), wherein the width of the small end of the second mounting groove is smaller than the width of the large end of the second mounting groove, wherein the second pawl (35) comprises a small end of the second pawl (38) and a large end of the second pawl (39), wherein the small end of the second pawl is inserted into the small end of the second mounting groove, wherein the second elastic element tends to drive the large end of the second pawl to move towards the small end of the second mounting groove, wherein a second pawl tooth is arranged on the second pawl which engages with the pawl wheel tooth (10). [6] Torque wrench according to claim 5, characterized by, that the second elastic element is configured as a second torsion spring (40), wherein the second torsion spring (40) comprises a second slotted insertion end and a second claw insertion end, wherein a second slotted insertion hole (43) is arranged at the bottom of the second mounting groove, wherein a second claw insertion groove (44) is arranged at the large end of the second pawl of the second pawl, wherein the second slotted insertion end is inserted into the second slotted insertion hole, wherein the second claw insertion end is inserted into the second claw insertion groove (44), wherein the second elastic element tends to drive the large end of the second pawl to move towards the small end of the second mounting groove. [7] Torque wrench according to any one of claims 2 to 6, further comprising a reduction device for a planetary gear (45), characterized by, that the reduction device for a planetary gear (45) has a reduction input and a reduction output, wherein the reduction device for a planetary gear (45) is fixedly connected to the drive motor (14), wherein the reduction input is fixedly connected to the drive motor's rotating shaft, and wherein the reduction output is fixedly connected to the drive rotating shaft (21). [8] Torque wrench according to any of the preceding claims, characterized by , that the manual torque release device (63) comprises the following components: a handle tube (1) wherein an axially extending handle perforation (2) is arranged inside the handle tube; an ejector pin seat (3) which is arranged to slide within the handle perforation (2); a torsion shaft (4), wherein the first connecting end of the torsion shaft (4) projects into the handle perforation (2) and is rotatably connected to the handle tube; a torque adjustment mechanism to apply a preload force to the ejector pin seat (3) in the direction of the torsion shaft (4); a torque release arrangement located between the torsion shaft (4) and the ejector pin seat (3); wherein the trigger body (6) is firmly connected to the second connecting end of the torsion shaft (4). [9] Torque wrench according to any one of claims 2 to 8, characterized by , that the control device comprises a battery (53) and a circuit board (47), wherein the battery (53) and the circuit board (47) are fixed in the connecting groove (19), wherein the drive motor (14) is electrically connected to the battery (53) and the circuit board (47). [10] Torque wrench according to any of the preceding claims, characterized by , that the manual torque release device (63) comprises the following components: a torsion tube (65) wherein a torsion connection hole (66) is arranged in the torsion tube (65); a torsion stabilizing shaft (67), wherein one end of the torsion stabilizing shaft (67) is inserted into the torsion connection hole (66) and is firmly connected to the torsion tube (65) and the other end is firmly connected to the pull-off body (6), wherein two mounting recesses are arranged opposite each other on the torsion stabilizing shaft (67), each with strain gauges (69) being attached in the two mounting recesses; a printed circuit board assembly (70), wherein the printed circuit board assembly (70) is electrically connected to the strain gauge (69).

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