High-low-temperature-resistant high-precision torque wrench

Abstract

A high-low-temperature-resistant high-precision torque wrench relates to the technical field of torque wrenches and comprises a wrench body, the wrench body comprises a wrench head and a wrench handle, a mounting space is formed in the wrench head, and a sensitive assembly is fixedly arranged on the side, close to a rear panel, in the wrench head. A display assembly is arranged on the side, close to the front panel, in the wrench head, a control assembly is fixedly arranged in the space between the sensitive assembly and the display assembly, and the wrench handle part comprises a fixed handle body and a movable handle body detachably matched with the fixed handle body. The end of the fixed handle body and the wrench head are integrally formed, and a power source assembly is detachably arranged in the movable handle body. By adopting the combination of the spoke type elastic body and the resistance strain gauge, the torque applied to the wrench can be accurately sensed and converted into an electric signal, and the requirement of high-precision measurement is met. The whole wrench is compact in structure, reasonable in design and capable of keeping stable working performance under the extreme temperature condition.

Description

Technical Field

[0001] This utility model relates to the field of torque wrench technology, specifically to a high-precision torque wrench resistant to high and low temperatures. Background Technology

[0002] In modern industry and transportation, the performance requirements for braking systems in vehicles, aircraft, and other equipment are extremely high. Braking torque, as one of the key parameters for measuring braking system performance, directly affects the safety and stability of the equipment. While traditional torque wrenches can meet the needs of torque measurement to a certain extent, their limitations become increasingly apparent when facing extreme low-temperature environments at high altitudes and when high-precision measurement requirements are demanded.

[0003] The environmental conditions in high-altitude areas are extremely harsh, especially the low temperatures, which pose a severe challenge to the performance of torque wrenches. Conventional torque wrenches typically use LCD displays to show torque values, but in extreme low temperatures, the response speed and display quality of these displays are significantly reduced, and they may even malfunction. This not only affects the accuracy of measurements but may also lead to operator misjudgments, thus jeopardizing the safe use of the equipment.

[0004] Most conventional torque wrenches use a cantilever beam structure for torque measurement. In this structure, the position of the force application point has a significant impact on the measurement results. Due to the mechanical characteristics of the cantilever beam structure, even a small change in the force application point can lead to significant fluctuations in the torque value. Therefore, when using conventional torque wrenches for high-precision measurements, it is often difficult to obtain stable and reliable measurement results. This not only reduces the accuracy of the measurement but also increases the difficulty for operators and the risk of error. Utility Model Content

[0005] The purpose of this invention is to provide a high-precision torque wrench resistant to high and low temperatures, in order to address the technical deficiencies pointed out in the background art.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0007] A high-precision torque wrench resistant to high and low temperatures includes a wrench body, which includes a wrench head and a wrench handle. The wrench head has an installation space, and a sensitive component is fixedly installed on the side of the wrench head near the rear panel. A display component is installed on the side of the wrench head near the front panel. A control component is fixedly installed in the space between the sensitive component and the display component. The wrench handle includes a fixed handle body and a movable handle body detachably engaged with the fixed handle body. The end of the fixed handle body is integrally formed with the wrench head, and a power supply component is detachably installed in the movable handle body.

[0008] Furthermore, the sensitive component includes a spoke-type elastomer, which is internally fixedly connected to form a hub by several spokes, and each spoke has a resistance strain gauge and a terminal attached to its two side walls. The resistance strain gauge and the terminal are connected by wires, and the terminal is connected to the control component by wires.

[0009] Furthermore, a number of square keys are evenly spaced on the outer side of the fixed end of the spoke-type elastomer. The square keys are installed and fixed with the keyway inside the wrench head. The force-applying end of the spoke-type elastomer is provided with an outer square rod. The outer square rod extends out of the rear panel and is used for torque detection. A first sealing ring is provided between the spoke-type elastomer and the rear panel.

[0010] Furthermore, the display component includes a digital tube display, a display window is formed on the front panel, a viewing glass is sealed and fixed below the display window, and the digital tube display is disposed below the viewing glass.

[0011] Furthermore, the movable handle is threadedly connected to the fixed handle. The power supply assembly includes a battery compartment disposed within the movable handle. A PCD base is disposed within the battery compartment, and several batteries are mounted on the PCD base via spring contacts. A power switch is disposed at one end of the battery compartment, and an electrical connector is disposed at the other end. A connector socket is disposed at the end of the fixed handle that connects to the movable handle. The electrical connector and the connector socket are electrically connected by insertion. The connector socket is connected to the control assembly via a wire.

[0012] Furthermore, a tail cap is threadedly connected to the end of the movable handle, and a second sealing ring is provided between the tail cap and the movable handle.

[0013] Furthermore, a push-button switch is provided on the fixed handle, and the push-button switch is connected to the control component via a wire.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] By combining a spoke-type elastomer with a resistance strain gauge, the torque applied to the wrench can be accurately sensed and converted into an electrical signal. The minute deformation of the resistance strain gauge accurately reflects the magnitude of the torque. Combined with a high-performance A / D converter, high-precision torque measurement is achieved, with a conversion accuracy of over 0.05%, meeting the requirements for high-precision measurement.

[0016] The wrench features a compact and rationally designed structure, enabling it to maintain stable performance under extreme temperature conditions. In particular, the sealing design between the sensitive and control components, as well as the threaded connection and sealing rings between the moving and fixed handles, effectively prevent the intrusion of moisture and dust, ensuring the wrench's reliability and durability in both high and low temperature environments.

[0017] The wrench head, handle (including fixed and movable handles), sensing components, display components, and control components all adopt a modular design for easy disassembly and maintenance. In particular, the detachable connection between the movable and fixed handles, as well as the detachable power supply, allows users to easily replace the battery or perform maintenance, improving the wrench's maintainability and lifespan. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a schematic diagram of the sensitive component structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the battery assembly structure of this utility model;

[0022] Figure 4 This is a block diagram of the circuit structure of this utility model;

[0023] Figure 5 This is a schematic diagram of the power supply circuit for the power supply component of this utility model;

[0024] Figure 6 This is a circuit schematic diagram of the sensor control unit of this utility model;

[0025] Figure 7 This is the schematic diagram of the A / D conversion circuit of this utility model;

[0026] Figure 8 This is a schematic diagram of the D / A conversion circuit of this utility model;

[0027] Figure 9 This is the main program flowchart of the sensor of this utility model. Detailed Implementation

[0028] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0029] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0032] like Figure 1-3 As shown, a high-precision torque wrench resistant to high and low temperatures includes a wrench body 1, which includes a wrench head and a wrench handle. The wrench head has an installation space, and a sensitive component 2 is fixedly installed on the side of the wrench head near the rear panel 2. A display component 6 is installed on the side of the wrench head near the front panel 7. A control component 5 is fixedly installed in the space between the sensitive component 2 and the display component 6. The wrench handle includes a fixed handle body and a movable handle body 11 that is detachably engaged with the fixed handle body. The end of the fixed handle body is integrally formed with the wrench head, and a power supply component is detachably installed in the movable handle body.

[0033] When in use, as the user applies torque to a bolt or nut with the wrench head, the sensitive component detects the change in torque and converts it into an electrical signal. The control component receives these electrical signals, processes them, and converts them into a corresponding torque value. The display component then displays these torque values ​​in real time for the user's reference. If the user has preset a specific torque value, the display component may issue an audible and visual alert when the actual applied torque reaches that value.

[0034] Specifically, as shown in the figure, the sensitive component 2 includes a spoke-type elastomer 21. The spoke-type elastomer 21 is internally fixedly connected to form a hub by several spokes. Each spoke has a resistance strain gauge 23 and a terminal 22 bonded to its two side walls. The resistance strain gauge 23 and the terminal 22 are connected by wires. The terminal 22 is connected to the control component 5 by wires.

[0035] The spoke-type elastic body 21 consists of several spokes fixedly connected to form a central hub. This allows the hub to undergo minute elastic deformation when an external force (i.e., torque) is applied, and this deformation can be precisely measured and converted into an electrical signal. A resistance strain gauge 23 is bonded to each side wall of the hub. A resistance strain gauge is a special resistive element whose resistance increases or decreases linearly with increasing strain. When the hub undergoes elastic deformation, the strain gauge also deforms, causing its resistance to change. Each resistance strain gauge 23 is connected to a terminal block 22 via a wire. The terminal block is used to convert the resistance change of the strain gauge into a measurable electrical signal and transmit it to the control component 5.

[0036] Specifically, as shown in the figure, a number of square keys are evenly spaced on the outer side of the fixed end of the spoke-type elastomer 21. The square keys are installed and fixed with the keyway inside the wrench head. The force-applying end of the spoke-type elastomer 21 is provided with an outer square rod 24. The outer square rod 24 extends out of the rear panel 2 and is used for torque detection. A first sealing ring 4 is provided between the spoke-type elastomer 21 and the rear panel 2.

[0037] The spoke-type elastomer 21 has several square keys on its fixed end, which match the keyways inside the wrench head to ensure that the elastomer can be stably and accurately installed inside the wrench head. The force-applying end of the spoke-type elastomer has an outer square rod 24 that extends out of the rear panel 2 and is used to directly contact the bolt or nut to be measured, thereby transmitting torque.

[0038] When torque is applied, the outer rod 24 transmits the torque to the spoke-type elastomer 21, causing elastic deformation of the wheel cover. This deformation is sensed by the resistance strain gauge 23 and converted into a change in resistance value. The terminal 22 converts these resistance changes into electrical signals and transmits them to the control component 5 via wires. The control component further processes these signals, calculates the actual torque value, and displays it on the display component 6.

[0039] Specifically, as shown in the figure, the display component 6 includes a digital tube display, a display window is formed on the front panel 7, and a viewing glass 6 is sealed and fixed below the display window. The digital tube display is positioned below the viewing glass 6. The digital tube display is a high- and low-temperature resistant digital tube, meeting the requirements for use in extreme low-temperature environments at high altitudes.

[0040] Specifically, as shown in the figure, the movable handle 11 is threadedly connected to the fixed handle. The power supply assembly includes a battery box 12 disposed within the movable handle. A PCD base 17 is disposed within the battery box 12, and several batteries 18 are mounted on the PCD base 17 via spring contacts. A power switch 16 is provided at one end of the battery box 12 to switch between power supply and power off, and an electrical connector 13 is provided at the other end. A connector socket 10 is provided at the end of the fixed handle that connects to the movable handle. The electrical connector 13 and the connector socket 10 are electrically connected by insertion. The connector socket 10 is connected to the control component 5 via a wire. This achieves power supply and power off switching. The battery box is easy to disassemble, and the batteries are replaceable.

[0041] Among them, the battery 18 is a high and low temperature resistant battery, which meets the requirements for use in the extreme low temperature environment of the plateau.

[0042] Specifically, as shown in the figure, the end of the movable handle is threaded with a tail cap 14, and a second sealing ring 15 is provided between the tail cap 14 and the movable handle.

[0043] Specifically, as shown in the figure, a push-button switch 19 is provided on the fixed handle, and the push-button switch 19 is connected to the control component 5 via a wire. Two push-button switches are provided on the fixed handle, respectively realizing zeroing control and switching between peak and real-time test measurement modes.

[0044] Furthermore, the torque wrench's control components integrate a conditioning circuit board and a signal amplifier board to accurately measure torque. The weak signal sensed by the sensitive element is first amplified by the amplification circuit on the signal amplifier board, and then filtered to remove noise, ensuring signal clarity and accuracy. The processed signal is sent to the conditioning circuit board, which not only powers the entire system but also filters, compensates for and protects the microcontroller signal, ensuring signal quality while performing data acquisition and conversion, ultimately outputting an analog signal that accurately reflects the torque magnitude, thus fully meeting the performance requirements of the torque wrench. Its circuit structure block diagram is shown below. Figure 4 As shown.

[0045] Furthermore, the circuit board power supply mainly performs power filtering and voltage reduction, and supplies power to all circuits in the sensor. The circuit schematic is shown below. Figure 5 The data acquisition circuit consists of four parts: analog signal conditioning and amplification, microcontroller, A / D conversion, and D / A conversion. The circuit schematic is shown below. Figure 6 , Figure 7 , Figure 8 .

[0046] Specifically, the XC886 microcontroller (manufactured by Infineon Technologies, Germany) utilizes its built-in reference source to provide a stable 2V constant voltage power supply to the strain gauge bridge circuit, ensuring signal stability and accuracy. A high-performance instrumentation amplifier, AD627, differentially amplifies the weak analog signal output from the strain gauge bridge circuit, improving signal strength. Subsequently, a high-speed 24-bit A / D converter, ADS1247, converts the amplified analog signal into a high-precision digital signal, seamlessly connecting with the microcontroller via serial communication. The microcontroller not only handles data processing but also uses internal algorithms to accurately compensate for sensor nonlinearity and temperature drift. It also indirectly acquires the temperature signal by measuring the bridge voltage, which is then collected by its built-in AD converter. Finally, the data processed by the microcontroller is output as an analog voltage signal by the AD420 digital-to-analog converter chip. The conversion accuracy of the entire circuit structure is above 0.05%, ensuring the high-precision measurement performance of the torque wrench.

[0047] Specifically, the main functions of this utility model are to complete system initialization, control the AD chip to acquire sensor data, data processing, data conversion and output, etc. Therefore, the main program loops through AD acquisition, digital filtering, temperature acquisition, and tension calculation programs. The main program flowchart is shown below. Figure 9 As shown.

[0048] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0049] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A high-precision torque wrench resistant to high and low temperatures, comprising a wrench body, characterized in that, The wrench body includes a wrench head and a wrench handle. The wrench head has an installation space. A sensitive component is fixedly installed in the wrench head near the rear panel. A display component is installed in the wrench head near the front panel. A control component is fixedly installed in the space between the sensitive component and the display component. The wrench handle includes a fixed handle and a movable handle that is detachably engaged with the fixed handle. The end of the fixed handle is integrally formed with the wrench head. A power supply component is detachably installed in the movable handle.

2. The high-precision torque wrench resistant to high and low temperatures according to claim 1, characterized in that, The sensitive component includes a spoke-type elastomer, which is internally fixedly connected to form a hub by several spokes. Each spoke has a resistance strain gauge and a terminal attached to its two side walls. The resistance strain gauge and the terminal are connected by wires, and the terminal is connected to the control component by wires.

3. A high-precision torque wrench resistant to high and low temperatures according to claim 2, characterized in that, Several square keys are evenly spaced on the outer side of the fixed end of the spoke-type elastomer. The square keys are installed and fixed to the keyway inside the wrench head. The force-applying end of the spoke-type elastomer is provided with an outer square rod. The outer square rod extends out of the rear panel and is used for torque detection. A first sealing ring is provided between the spoke-type elastomer and the rear panel.

4. A high-precision torque wrench resistant to high and low temperatures according to claim 3, characterized in that, The display component includes a digital tube display, a display window is formed on the front panel, and a viewing glass is sealed and fixed below the display window. The digital tube display is disposed below the viewing glass.

5. A high-precision torque wrench resistant to high and low temperatures according to claim 4, characterized in that, The movable handle is threadedly connected to the fixed handle. The power supply assembly includes a battery box disposed within the movable handle. A PCD base is disposed within the battery box, and several batteries are mounted on the PCD base via spring contacts. A power switch is disposed at one end of the battery box, and an electrical connector is disposed at the other end. A connector socket is disposed at the end of the fixed handle that connects to the movable handle. The electrical connector is inserted into the connector socket for electrical connection. The connector socket is connected to the control assembly via a wire.

6. A high-precision torque wrench resistant to high and low temperatures according to claim 5, characterized in that, The movable handle is threaded to a tail cap, and a second sealing ring is provided between the tail cap and the movable handle.

7. A high-precision torque wrench resistant to high and low temperatures according to claim 6, characterized in that, A push-button switch is provided on the fixed handle, and the push-button switch is connected to the control component via a wire.

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