阅读说明：本技术 一种扭矩检测方法 (Torque detection method ) 是由 赵美云 殷云辉 何钱 李伟 田森 于 2019-11-21 设计创作，主要内容包括：一种扭矩检测方法,它包括以下步骤：1)在初始状态时,弹簧产生一定的预紧力,通过顶杆将预紧力传递给传力杆,该预紧力使得弹簧、顶杆、传力杆、扭矩扳手头部位于同一直线上；2)在施加扭矩后,当扭矩值大于弹簧预紧力时,传力杆绕第三圆柱销转动,传力杆的曲面端与顶杆的曲面端活动接触,由于顶杆安装在内套筒中,使得顶杆产生轴向运动,弹簧被进一步压缩,扭矩扳手头部相对于扭矩扳手主体外套筒绕第二圆柱销转动一定的角度；3)传感器检测传力杆前端的位移和/或面积,产生电信号,该电信号与压力传感器产生的电信号通过电子单元处理转化为扭矩值显示在电子单元的电子显示屏中。本发明的目的在于提供一种用于扭矩扳手的扭矩检测方法。(A method of torque sensing comprising the steps of: 1) in an initial state, the spring generates a certain pretightening force, the pretightening force is transmitted to the dowel bar through the ejector rod, and the pretightening force enables the spring, the ejector rod, the dowel bar and the head of the torque wrench to be positioned on the same straight line; 2) after torque is applied, when the torque value is larger than the pretightening force of the spring, the dowel bar rotates around the third cylindrical pin, the curved surface end of the dowel bar is movably contacted with the curved surface end of the ejector rod, the ejector rod is arranged in the inner sleeve, so that the ejector rod generates axial motion, the spring is further compressed, and the head part of the torque wrench rotates around the second cylindrical pin for a certain angle relative to the outer sleeve of the torque wrench body; 3) the sensor detects the displacement and/or the area of the front end of the dowel bar, generates an electric signal, and the electric signal generated by the pressure sensor are converted into a torque value through the processing of the electronic unit and are displayed in an electronic display screen of the electronic unit. The invention aims to provide a torque detection method for a torque wrench.)

1. A method of detecting torque, comprising the steps of:

1) in an initial state, the spring (17) generates a certain pretightening force, the pretightening force is transmitted to the dowel bar (14) through the ejector rod (15), and the pretightening force enables the spring (17), the ejector rod (15), the dowel bar (14) and the torque wrench head (1) to be positioned on the same straight line;

2) after torque is applied, when the torque value is larger than the pretightening force of the spring, the dowel bar (14) rotates around the third cylindrical pin (28), the curved surface end of the dowel bar (14) is movably contacted with the curved surface end of the ejector rod (15), the ejector rod (15) generates axial movement due to the fact that the ejector rod (15) is installed in the inner sleeve (23), the spring is further compressed, and the head (1) of the torque wrench rotates around the second cylindrical pin (13) for a certain angle relative to the outer sleeve (24) of the torque wrench body;

3) the sensor detects the displacement and/or the area of the front end of the dowel bar (14) to generate an electric signal, and the electric signal generated by the pressure sensor are processed by the electronic unit (27) to be converted into a torque value which is displayed on an electronic display screen of the electronic unit (27);

the torque wrench is used for detecting the torque of the torque wrench, the torque wrench comprises a dowel bar (14), the front end of the dowel bar (14) is arranged in a sensing part of a sensor, the tail end of the dowel bar (14) is movably connected with the front end of a push rod (15), the rear end of the push rod (15) is connected with one end of a spring (17), and the other end of the spring (17) is connected with a fixing mechanism.

2. A method according to claim 1, characterized in that the fixing means are adapted to fix the end of the spring (17) in a specific position for generating an initial pretension of the spring (17).

3. The torque detection method according to claim 1, wherein the sensing part of the sensor comprises a capacitive grating sensor arranged at the connecting part of the torque wrench head (1), the front end of the dowel bar (14) is connected with the connecting part of the torque wrench head (1) through a rotating shaft structure (13), and the extension end of the front end of the dowel bar (14) is arranged in the sensing part of the capacitive grating sensor.

4. The torque detection method according to claim 3, wherein the torque wrench head (1) is connected with one end of the dowel bar (14) through a rotating shaft structure at a connecting part, the other end of the dowel bar (14) is a curved end, and the ejector rod (15) is in contact connection with the curved end of the dowel bar (14) through a protruding part at the front end.

5. The torque detection method according to claim 4, wherein the torque wrench further comprises a main body outer sleeve (24), the connecting portion of the torque wrench head (1), the dowel (14), the ejector pin (15), and the spring (17) are all arranged in the main body outer sleeve (24), the connecting part of the torque wrench head (1) is rotatably connected with the dowel bar (14) through a first cylindrical pin (13), a second cylindrical pin (10) and a third cylindrical pin (28) are respectively arranged on two sides of the first cylindrical pin (13), the second cylindrical pin (10) is arranged at a connecting part of the head of the torque wrench and is close to the head of the torque wrench, the third cylindrical pin (28) is arranged on the dowel bar (14), the head of the torque wrench (1) is connected with an outer sleeve (24) of a torque wrench body through the second cylindrical pin (10), and the dowel bar (14) is connected with the outer sleeve (24) of the torque wrench body through the third cylindrical pin (28);

the device also comprises an inner sleeve (23), the spring (17), the joint of the spring (17) and the ejector rod (15) are arranged in the inner sleeve (23), and the ejector rod (15) and the inner sleeve (23) are fixedly connected through a positioning nut (16);

the tail end of the spring (17) is provided with a pressure sensor, and the spring (17) can transmit the pressure born by the front end to the pressure sensor.

6. The torque detection method according to claim 1 or 2, characterized in that the fixing mechanism comprises an adjusting rod (21) arranged in a main body outer sleeve (24), a pressure sensor (18) is arranged between the adjusting rod (21) and the end of the spring (17), the connecting part of the pressure sensor (18) is in contact connection with the end of the adjusting rod (21), the cylindrical sleeve (20) can limit the radial movement of the adjusting rod (21), and the fourth cylindrical pin (19) can limit the axial movement of the cylindrical sleeve.

7. The torque detection method according to claim 1 or 5, wherein a thread is arranged at the end of the outer sleeve (24) of the torque wrench body, the external thread of the outer sleeve (24) of the torque wrench body is connected with the internal thread of the adjusting handle (25), and the adjusting handle (25) is manually rotated to a gear scale marked on the surface of the outer sleeve.

8. The torque detection method according to claim 1 or 5, wherein an adjusting handle (25) is sleeved outside the inner sleeve (23), and a locking mechanism is arranged at the tail end of the adjusting handle (25).

9. The capacitive sensor torque wrench of claim 8, wherein: the locking mechanism comprises a screw cap (26), and the screw cap (26) is in threaded connection with the tail end of the adjusting handle (25).

Technical Field

The invention belongs to the field of mechanical equipment, and particularly relates to a torque detection method for a torque wrench, which is a divisional application of an invention patent with the application number of 2019111506062.

Background

The torque wrench is a special tool capable of feeding back the tightening torque in real time, can apply the accurate tightening torque, and plays a vital role in some occasions in engineering.

The assembly requirement of the transmission tower is that a torque wrench is used during initial assembly, connecting bolts are fastened one by one, and the torque wrench used for bolt connection needs to reach a torque value so as to introduce 'pretightening force' into a fastener. The reliability of bolt fastening is controlled by observing the bolt torque value. When the torque applied to the attachment bolt exceeds a certain torque level, the attachment bolt stretches axially. This axial tension results in a pre-tension in the bolt and nut that holds the tower and foundation together. Therefore, the torque wrench can control or display the torque, so that the torque value of the tightened bolt can be accurately controlled, and the long-term reliable work of the transmission tower is ensured.

There are many types of torque wrenches, mainly classified into mechanical type and intelligent type, for example, patent document No. CN206216578U discloses a torque wrench, which mainly includes a wrench body provided at an end portion; a torque strain rod arranged in the wrench main body and one end of the torque strain rod is connected with the tool head; a torque sensor disposed on the torque strain rod to detect a torque value transmitted from the tool head to the torque strain rod; an angle sensor provided in the wrench body to detect a horizontal angle of the tool head and the wrench body; the circuit board device is arranged in the wrench main body and is used for processing the detected torque signal and angle signal, can display accurate torque and angle values and alarm operation in real time, and realizes remote management and random correction of torque value and angle value data of the torque wrench.

The mechanical torque wrench is low in price, firm and durable, but the torque control precision is low, the torque range is limited, and the torque value cannot be accurately controlled and displayed in real time, so that the connection reliability of the screwed bolt cannot be guaranteed. At present, most of research on torque wrenches focuses on intelligent digital torque wrenches with functions of constant value alarm and overload failure. The existing torque wrench has the advantages of mature technology, stable performance, humanized operation interface, strong data processing function and the like, but an intelligent torque wrench system comprises an electronic tag, a torque wrench, information management software and the like, and the required functions are completed through a series of intelligent chips. The torque wrenches of the same type have the problem of complex structure. Meanwhile, the torque wrench on the market has the dilemma that the precision and the price are difficult to complete, the wrench with higher precision is usually a digital display type torque wrench, the imported products are more, the price is generally higher, the lower price is mostly a pointer type torque wrench with a simple structure, the precision is low, the range is small, the torque wrench cannot be operated under the actual complex working condition, and the use requirement is difficult to meet. This is why torque wrenches are not widely used in the related art.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides an intelligent torque wrench and a torque detection method, which can be used for well detecting the torque of the wrench through a capacitive grating sensor on one hand and well solving the technical problems that a pre-tightening spring is easy to permanently deform, the fastening torque is easy to change and the precision cannot be guaranteed in the use process of the conventional torque wrench on the other hand.

In order to solve the technical problems, the invention provides the following technical scheme:

a capacitance grid type sensor torque wrench comprises a torque wrench head, wherein the torque wrench head is connected with one end of a dowel bar through a rotating shaft structure at a connecting part, the other end of the dowel bar is a curved surface end, a mandril is in contact connection with the curved surface end of the dowel bar through a bulge part at the front end, the rear end of the mandril is connected with one end of a spring, the other end of the spring is connected with a fixing mechanism, the fixing mechanism is used for fixing the tail end of the spring at a specific position, and a capacitance grid type sensor is arranged at the connecting part of the torque wrench head; the front end of the dowel bar is connected with the connecting part of the head part of the torque wrench through a rotating shaft structure, and the extension end of the front end of the dowel bar is arranged in the induction part of the capacitive grating sensor.

The torque wrench is characterized by further comprising a main body outer sleeve, the connecting portion of the torque wrench head is connected with the dowel bar in a rotating mode through a first cylindrical pin, the two sides of the first cylindrical pin are respectively provided with a second cylindrical pin and a third cylindrical pin, the second cylindrical pin is arranged at the connecting portion of the torque wrench head and is close to the position of the torque wrench head, the third cylindrical pin is arranged on the dowel bar, the torque wrench head is connected with the torque wrench main body outer sleeve through the second cylindrical pin, and the dowel bar is connected with the torque wrench main body outer sleeve through the third cylindrical pin.

The spring, the spring and the ejector rod are arranged in the inner sleeve, and the ejector rod, the spring, the main body outer sleeve and the inner sleeve are fixedly connected through the positioning nut so as to limit radial rotation of the ejector rod.

The tail end of the spring is provided with a pressure sensor, and the spring can transmit the pressure born by the front end to the pressure sensor.

The fixing mechanism comprises an adjusting rod arranged in an outer sleeve of the main body, a pressure sensor is arranged between the adjusting rod and the end of the spring, a connecting part of the pressure sensor is in contact connection with the end of the adjusting rod, the cylindrical sleeve limits the radial movement of the adjusting rod, and the fourth cylindrical pin limits the axial movement of the cylindrical sleeve.

The tail end of the outer sleeve of the torque wrench body is provided with threads, the external threads of the outer sleeve of the torque wrench body are connected with the internal threads of the adjusting handle, and the adjusting handle is manually rotated to the gear scale mark marked on the surface of the outer sleeve to adjust gears.

An adjusting handle is sleeved outside the inner sleeve, and a locking mechanism is arranged at the tail end of the adjusting handle.

The locking mechanism comprises a nut, and the nut is in threaded connection with the tail end of the adjusting handle.

A torque detection method comprises a dowel bar, wherein the front end of the dowel bar is arranged in an induction part of a sensor, the tail end of the dowel bar is movably connected with the front end of a mandril, the rear end of the mandril is connected with one end of a spring, the other end of the spring is connected with a fixing mechanism, and the fixing mechanism is used for fixing the tail end of the spring at a specific position;

when in use, the following steps are adopted:

1) in an initial state, the spring generates a certain pretightening force, the pretightening force is transmitted to the dowel bar through the ejector rod, and the pretightening force enables the spring, the ejector rod and the dowel bar to be positioned on the same straight line;

2) after torque is applied, when the torque value is larger than the pretightening force of the spring, the dowel bar 14 rotates around the third cylindrical pin to generate radial motion, and the spring is further compressed;

3) the sensor detects the displacement and/or area of the front end of the dowel bar, generates an electric signal, and converts the electric signal into a torque value to be output.

By adopting the technical scheme, the technical effects are as follows:

the head of the invention is provided with a ratchet wheel and a reversing device, so that the equipment can be operated in two directions. An operator rotates the torque grade adjusting device according to the torque value, and the adjusting rod is connected with the torque grade adjusting device through the gasket and the bolt, namely the torque grade adjusting device is manually rotated, the adjusting rod correspondingly moves forwards or backwards in the inner sleeve in the radial direction to compress and release the spring, so that the grade torque interval is suitable for the torque required by the diameter of the bolt, the measurement value range of the torque wrench can be correspondingly enlarged, and compared with the torque wrench which adopts a tolerance type sensor according to manual experience, the tightening precision can be improved. The invention is convenient to use, can reduce the labor intensity and improve the construction efficiency;

when the existing torque wrench is used, a pre-tightening spring is easy to permanently deform, the tightening torque is easy to change, the precision cannot be guaranteed, an operator often does not know that the tightening torque changes, serious consequences are generated in operation, and the correct transmission of the precision is guaranteed only by means of regular calibration. On the other hand, most of the existing torque wrenches adopt a strain gauge torque sensor and a non-contact torque sensor, but the strain gauge torque sensor transmits the bridge pressure input of a strain bridge on a rotating body and the detected strain signal output between a rotating part and a static part by using a conductive slip ring, and the conductive slip ring is in friction contact, so that friction and heat generation inevitably exist, the service life of the conductive slip ring is limited, the conductive slip ring is easy to be interfered by field electromagnetic waves, and the non-contact torque sensor is in contact friction to cause abrasion, the service life is short, the stability of the sensor is poor, meanwhile, the conductive slip ring and the non-contact torque sensor are independent units, the occupied space is large, the range of the range is certain, and the adjustment cannot be performed, namely, the range of the torque wrench is limited. The technical defects mainly solved by our patent are that the verification and calibration of the pre-tightening spring and the working stability of the sensor are realized, meanwhile, the capacitive grating type sensor and the torque wrench structure form a whole, the space is saved, and the capacitive grating type sensor and the torque wrench mechanical structure form a system, so that the measuring range of the torque wrench can be increased.

Drawings

The invention is further illustrated by the following examples in conjunction with the accompanying drawings:

FIG. 1 is a profile view of a torque wrench of the present invention;

FIG. 2 is an external structural view of the torque wrench of the present invention;

FIG. 3 is an internal structural view of the torque wrench of the present invention;

FIG. 4 is a schematic view of the head structure of the torque wrench body according to the present invention;

FIG. 5 is a profile view of the torque wrench body head of the present invention;

FIG. 6 is a cross-sectional view of the torque wrench head of the present invention;

FIG. 7 is an internal schematic view of the torque wrench of the present invention;

fig. 8 is a schematic structural diagram of a capacitive-gate sensor according to the present invention.

Detailed Description

A torque detection method comprises a dowel bar 14, wherein the front end of the dowel bar 14 is arranged in a sensing part of a sensor, the tail end of the dowel bar 14 is movably connected with the front end of a mandril 15, the rear end of the mandril 15 is connected with one end of a spring 17, the other end of the spring 17 is connected with a fixing mechanism, and the fixing mechanism is used for fixing the tail end of the spring 17 at a specific position;

when in use, the following steps are adopted:

1) in an initial state, the spring 17 generates a certain pretightening force, the pretightening force is transmitted to the dowel bar 14 through the ejector rod 15, and the pretightening force enables the spring 17, the ejector rod 15 and the dowel bar 14 to be positioned on the same straight line;

2) after torque is applied, when the torque value is larger than the pre-tightening force of the spring, the dowel bar 14 rotates around the third cylindrical pin 28 to generate radial movement, and the spring is further compressed;

3) the sensor detects the displacement and/or area of the front end of the dowel bar 14, generates an electric signal, and the electric signal is converted into a torque value to be output.

A capacitive grating sensor torque wrench comprises a torque wrench head 1, wherein the torque wrench head 1 is connected with one end of a dowel bar 14 through a rotating shaft structure at a connecting part, the other end of the dowel bar 14 is a curved surface end, a mandril 15 is in contact connection with the curved surface end of the dowel bar 14 through a bulge part at the front end, the rear end of the mandril 15 is connected with one end of a spring 17, the other end of the spring 17 is connected with a fixing mechanism, the fixing mechanism is used for fixing the tail end of the spring 17 at a specific position, and a capacitive grating sensor is arranged at the connecting part of the torque wrench head 1; the front end of the dowel bar 14 is connected with the connecting part of the torque wrench head part 1 through a rotating shaft structure, and the extension end of the front end of the dowel bar 14 is arranged in the sensing part of the capacitive grating sensor.

The torque wrench is characterized by further comprising a main body outer sleeve 24, the connecting portion of the torque wrench head portion 1, the dowel bar 14, the ejector rod 15 and the spring 17 are all arranged in the main body outer sleeve 24, the connecting portion of the torque wrench head portion 1 is rotatably connected with the dowel bar 14 through the first cylindrical pin 13, the second cylindrical pin 10 and the third cylindrical pin 28 are respectively arranged on two sides of the first cylindrical pin 13, the second cylindrical pin 10 is arranged on the connecting portion of the torque wrench head portion and close to the position of the torque wrench head portion, the third cylindrical pin 28 is arranged on the dowel bar 14, the torque wrench head portion 1 is connected with the torque wrench main body outer sleeve 24 through the second cylindrical pin 10, and the dowel bar 14 is connected with the torque wrench main body outer sleeve 24 through the third cylindrical pin 28.

The device further comprises an inner sleeve 23, the spring 17, the connection part of the spring 17 and the ejector rod 15 are arranged in the inner sleeve 23, and the ejector rod 15 and the inner sleeve 23 are fixedly connected through the positioning nut 16.

Further, the spring 17 is provided with a pressure sensor at the end, and the spring 17 can transmit the pressure borne by the front end to the pressure sensor.

The fixing mechanism comprises an adjusting rod 21 arranged in a main body outer sleeve 24, a pressure sensor 18 is arranged between the adjusting rod 21 and the end part of the spring 17, the connecting part of the pressure sensor 18 is in contact connection with the end part of the adjusting rod 21, the cylindrical sleeve is used for limiting the radial movement of the adjusting rod, and the fourth cylindrical pin is used for limiting the axial movement of the cylindrical sleeve. The other end of the spring is connected with a pressure sensor, the pressure sensor connecting part is in contact connection with the end part of the adjusting rod, the adjusting rod is in rigid connection with the adjusting handle through threaded connection, and the adjusting handle is in rigid connection with the outer sleeve of the main body through threaded connection, so that the position of the spring is limited.

The tail end of the outer sleeve 24 of the torque wrench body is provided with threads, the external threads of the outer sleeve of the torque wrench body are connected with the internal threads of the adjusting handle 25, and the adjusting handle 25 is manually rotated to the gear scale marked on the surface of the outer sleeve to adjust gears.

An adjusting handle 25 is sleeved outside the inner sleeve 23, and a locking mechanism is arranged at the tail end of the adjusting handle 25.

The locking mechanism comprises a nut 26, and the nut 26 is in threaded connection with the end of the adjusting handle 25.

Example (b):

a capacitive sensor torque wrench comprises a torque wrench head 1, a ratchet wheel 2, a reversing valve 3, a ball 4, a spring 5, a torque wrench head cover 6, a screw 7, a reversing handle 8, a capacitive sensor receiving pole 9, a cylindrical pin fixing ring 11, a sending electrode assembly 12, a force transmission rod 14, a push rod 15, a positioning nut 16, a spring 17, a spring cushion block, a cylindrical sleeve 20, an adjusting rod 21, a nut 22, an inner sleeve 23, a torque wrench main body outer sleeve 24, an adjusting handle 25, a nut 26 and an electronic unit 27. The ratchet wheel 2 is meshed with the reversing valve 3 through a gear and is arranged at the head of the torque wrench main body; the spring 5 is in a compressed state and is matched with the ball 4 to limit the movement of the reversing valve 3; the screw 7 is matched with the torque wrench head cover 6 and the threaded hole in the torque wrench head through threads to fix the ratchet 2 and the reversing valve 3; the reversing handle 8 is in rigid connection with the reversing valve 3 to control the reversing valve to rotate so as to control the ratchet wheel to rotate forwards and reversely;

the receiving electrode 9 is fixedly arranged in a groove at the head part of the torque wrench; the head of the torque wrench is connected with the outer sleeve 24 of the torque wrench main body through a cylindrical pin, and the cylindrical pin is fixed through a cylindrical pin fixing ring; the emission electrode assembly 12 is rigidly connected with a dowel bar 14, the left end of the dowel bar 14 is connected with the head part 1 of the torque wrench through a cylindrical pin, the dowel bar 14 is connected with the outer sleeve of the torque wrench through the cylindrical pin, and the right end of the dowel bar 14 is contacted with an ejector rod 15; the ejector rod 15, the spring 17 and the pressure sensor 18 are arranged in the inner sleeve 23, the left end of the spring 17 is in contact with the ejector rod, the right end of the spring 17 is in contact with the pressure sensor 18, and the positioning nut 16 is matched with a threaded hole of the inner sleeve 23 and matched with a groove of the ejector rod 15 to limit radial rotation of the ejector rod 15; the left end of the adjusting rod 21 is contacted with the pressure sensor 18, and the cylindrical hole of the cylindrical sleeve 20 and the cylindrical hole of the outer sleeve 24 of the torque wrench main body are matched with the cylindrical pin to limit the radial movement of the adjusting rod 21 and the inner sleeve 23; the adjusting rod 21 is contacted with the adjusting handle 25 and forms rigid connection through the nut 22; the screw cap 26 forms a rigid connection with the adjustment handle 25 by means of a threaded connection.

As shown in fig. 4, the spring 17 generates a certain pre-tightening force, and the pre-tightening force is transmitted to the dowel bar 14 through the ejector rod 15, so that the torque wrench head 1 and the torque wrench body outer sleeve 24 do not rotate relatively when no torque is applied (the spring has a certain pre-tightening force, and the dowel bar is required to move radially when the torque wrench head 1 and the torque wrench body outer sleeve 24 rotate relatively, thereby further compressing the spring). When torque is applied, when the torque value is not larger than the pretightening force of the spring, the head 1 of the torque wrench body and the dowel bar 14 do not rotate around the rotation center. When the torque value is larger than the pretightening force of the spring, the head 1 of the torque wrench body and the dowel bar 14 rotate around the center of rotation to generate radial motion, the spring is further compressed, the emitter and the receiver of the capacitive grating sensor generate relative displacement or area to generate an electric signal, and the electric signal is converted into the torque value to be output through data conversion of an electronic unit. The process of the torque wrench for achieving nut screwing is as follows, according to the rotating direction of the nut, the reversing handle 8 is adjusted, the ratchet wheel 2 of the torque wrench is matched with the nut through an external converter (the converter can achieve nuts of different sizes and specifications), certain force is applied to the torque wrench handle 25, in the initial stage, the force applied by the torque wrench is used for overcoming the friction force between the nut and the bolt, the screwing torque is small, at the moment, the head portion 1 of the torque wrench and the force transmission rod 14 do not rotate around the rotating center, when the force applied by the torque wrench overcomes the friction force and the pre-tightening force between the nut and the bolt, the moment at the moment is large, the head portion 1 of the torque wrench and the force transmission rod 14 rotate around the rotating center, the ejector rod 15 generates radial movement, and the spring is compressed. Meanwhile, the transmitting electrode assembly 12 rigidly connected with the dowel bar 14 and the receiving electrode 9 of the capacitive grating sensor rotate relatively (the relative rotation is the distance between the head 1 of the torque wrench and the left side and the right side inside the outer sleeve 24 of the torque wrench body), and the relative displacement or area in the rotating process is detected. In order to increase the range of the torque wrench, the torque wrench is provided with 3 gear adjustments, the range is 100N.M-5000N.M, when the pretightening force is 100N.M-1500N.M, the handle is adjusted to 1 gear, the pretightening force of the spring can ensure that the torque value can be measured in the rotation angle of the head part 1 of the torque wrench without reaching the required pretightening force when the head part 1 of the torque wrench reaches the rotation limit, when the pretightening force is 1500N.M-3000N.M, the gear is adjusted to 2 gears to ensure that the torque value can be measured in the rotation angle limit of the head part 1 of the torque wrench, when the pretightening force is 3000N.M-5000N.M, the gear is adjusted to 3 gears to ensure that the torque value can be measured in the rotation angle limit of the head part 1 of the torque wrench. In the process, the pressure sensor 18 detects the pretightening force of the spring (the pretightening force of the spring can deviate in use, when the pretightening force is adjusted to a certain gear in a traditional mode, the pretightening force is defaulted to be the designed standard torque, the torque value can deviate, and the pretightening force of the spring can be detected in real time by adopting the pressure sensor), in order to avoid the damage of a signal transmission line inside the torque wrench, the data detected by the pressure sensor is wirelessly transmitted to the electronic unit, meanwhile, in different gears, the electronic unit is different according to the data conversion mechanism detected by the capacitive grating sensor (for example, in the gear 1, the torque value of the torque wrench at the rotation angle of 2 ° is 800N.M, and in the gear 2, the torque wrench at the rotation angle of 2 ° is 2000 N.M), and the electronic unit 27 selects the conversion mechanism corresponding to the gear in the memory according to the pretightening force and data conversion control, so as to output the corresponding torque value.

During operation, according to the torque value that bolt pretension needs to reach and the rotation direction of torque wrench in the course of the work, adjust reversing handle 8 and make torque wrench's rotation direction opposite with the atress direction, handle 25 adjusts to corresponding gear simultaneously for measured torque value is in this range, and when operating personnel applys the moment of torsion that reaches the settlement torque value size through torque wrench, buzzer warning, suggestion operating personnel operation completion.