Wireless intelligent torque wrench based on single-chip microcomputer control

Abstract

The utility model discloses a wireless intelligent torque wrench based on single-chip microcomputer control. The wireless intelligent torque wrench comprises a metal handle, a control body and a holding handle. The metal handle comprises a ratchet head, an internal connecting rod, a load sensor and a tail fixing end, the ratchet head is connected with the load sensor through the internal connecting rod, the control main body comprises a single chip microcomputer, a wireless communication module, a digital display module, a key module, a power module, an acousto-optic module and a battery, and the charging port is located in the holding handle. The load sensor is composed of four strain gauges with the same resistance, the strain gauges are attached to the four transverse faces of a measuring position respectively, and when a ratchet wheel connected with the load sensor and located at the front end of a metal handle is bent or twisted, the four strain gauge sets can generate corresponding strain signals; according to the wireless intelligent torque wrench, the WL6601-TC Bluetooth module serves as the wireless communication module, the HX6002 single-chip microcomputer is adopted for control, power consumption is small, manufacturing is easy, cost is low, the function of the torque wrench is achieved, meanwhile, power consumption can be effectively reduced, and cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a torsion spanner equipment, concretely is a wireless intelligent torsion spanner based on singlechip control. BACKGROUND

[0002] The intelligent torsion spanner is indispensable in modern industry and is widely used in the fields of automobile manufacturing, aerospace, precision machinery and the like for accurately controlling the tightening torque of bolts or nuts and ensuring the reliability and safety of connecting pieces. In recent years, with the rapid development of wireless communication technology, the intelligent torsion spanner with wireless transmission function gradually becomes a new favorite in the market, can transmit torque data to a receiving device in real time, is convenient for data recording and analysis, and improves work efficiency and accuracy.

[0003] However, the wireless communication module and the data processing module in the prior art have large power consumption, resulting in short battery life and the need for frequent battery replacement; some products adopt high-performance wireless communication chips and complex circuit designs, resulting in high product cost. CONTENT OF THE UTILITY MODEL

[0004] In view of the problems of large power consumption and high cost of the wireless communication module and the data processing module in the prior art, the utility model provides a wireless intelligent torsion spanner based on singlechip control, which realizes low cost, low power consumption and high cost performance by simplifying the wireless communication module, the data processing module and the torque measurement.

[0005] The technical scheme for achieving the utility model is as follows:

[0006] A wireless intelligent torsion spanner based on singlechip control, which comprises a torsion spanner composed of a metal handle, a control main body and a holding handle, and differs from the prior art in that:

[0007] The metal handle comprises a front end ratchet head, an internal connecting rod, an external metal sleeve, a load sensor and a tail fixed end, the front end ratchet head is connected to the load sensor through the internal connecting rod, the load sensor is composed of four strain gauges with the same resistance, four strain gauges R1, R2, R3 and R4 are respectively attached to four faces of the measuring place transversely, form a Wheatstone full bridge, and generate an electric signal when the torsion spanner works, which is transmitted to a singlechip for amplification and processing;

[0008] The control main body comprises a singlechip, a wireless communication module and a power module connected to the singlechip respectively, and a control panel composed of a digital display module, a key module and an audible and visual module, the singlechip transmits the data received and processed to the digital display module through the wireless communication module, the digital display module displays the measured torque value in the measuring area and compares it with a preset torque value, the audible and visual module issues an alarm when the measured torque value is equal to the preset torque value, and transmits the alarm to an upper computer or a designated user terminal for recording through the wireless communication module.

[0009] The holding handle is provided with a power charging port connected with the power module.

[0010] Further,

[0011] The single-chip microcomputer adopts HX6002 single-chip microcomputer; the HX6002 single-chip microcomputer has a period of 3T, an instruction set compatible with MCS-51, a working voltage range of 1.85-2.8V, a working current of 1200uA, and a power-off current of 5uA; the single-chip microcomputer integrates AD acquisition and amplifier, has a maximum gain of 128, and can amplify the tiny strain signal output by the load sensor.

[0012] The wireless communication module adopts a WL6601-TC Bluetooth module; the module is full-duplex bidirectional communication, users can perform bidirectional communication through the serial port of the module and mobile devices, the data processed by the single-chip microcomputer is transmitted to the upper computer or a specified user terminal through the serial port, and users can also perform read-write operation on the module through an APP and send the preset torque to the single-chip microcomputer through the serial port.

[0013] The control panel is composed of a digital display module, a key module and an audible and visual module; the digital display module adopts a 0.91-inch OLED display screen, the key module is composed of three keys arranged in a straight line, and the audible and visual module is composed of two LED lamps and a buzzer; and the OLED display screen is located between the keys arranged in a straight line and the LED.

[0014] The working principle of the wireless intelligent torque wrench is that the torque T generated by the ratchet head and the fastener is converted into a bending moment M, the load sensor is deformed under the action of the front connecting rod, so that the strain gauge located on the load sensor generates stress σ and strain ε, the resistance of the strain gauge changes, the output voltage e of the full-bridge system composed of the strain gauge changes due to the change of the resistance, and the changed electrical signal is transmitted to the single-chip microcomputer for storage and processing, and the principle and related formulae are as follows:

[0015] For strain measurement, the Wheatstone full-bridge converts resistance change into voltage change. The strain gauge resistances are R1, R2, R3 and R4, R1=R2=R3=R4=R, the changed resistance is ΔR, and the excitation voltage is E. Then, the output voltage is obtained through the following equation:

[0016]

[0017] Wherein R1=R2=R3=R4=R, and R is much larger than ΔR, Ks is the strain gauge coefficient, and then:

[0018]

[0019] σ is stress, ε is strain, and E is Young's modulus

[0020]

[0021] σ = E * ε

[0022] M is the bending moment, r is the distance from any point on the section to the neutral axis, and l1 is the bending moment arm length

[0023] M = σ / (Π * r 3 )

[0024] M = F * l1

[0025] T is the torque, and l2 is the torque arm length

[0026] T = F * l2

[0027] Further, the intelligent torque wrench has a manual zero reset button, if the torque value before use is not zero reset, the torque value before use can be manually zero reset; when the torque measurement area has a number before the torque wrench is used, the number can be manually zero reset, and one-time short pressing of the number increase and decrease button can realize the number zero reset, and the value before zero reset is recorded to the EEPROM storage processing of the single-chip microcomputer.

[0028] Compared with the prior art, the utility model has beneficial effects:

[0029] The utility model discloses a HX6002 single-chip microcomputer, the single-chip microcomputer has 16 I / O ports, 12 bidirectional I / O ports, supports four working modes, can satisfy the functional needs of the intelligent torque wrench, and the working voltage, working current and power-off current of the single-chip microcomputer are low, can effectively reduce the power consumption of the torque wrench, the mechanical cycle is 3T, the instruction execution speed is faster, can quickly respond to the demand of the intelligent torque wrench in real-time control, the instruction set is compatible with MCS-51 and is easy to program and control, and the development cost is lower, the single-chip microcomputer integrates AD acquisition and operational amplifier, the maximum gain is 128, can directly amplify the small electric signal after acquisition, can simplify the circuit and reduce production cost, and the WL6601-TC Bluetooth module is adopted when realizing the wireless communication function, and the module is low in cost, low in power consumption, easy to connect and small in size. DRAWINGS

[0030] Figure 1 It is the schematic diagram of the utility model;

[0031] Figure 2 It is the circuit schematic diagram of the utility model;

[0032] Figure 3 It is the front structure schematic diagram of the utility model;

[0033] Figure 4 It is the cross section structure schematic diagram of the utility model;

[0034] Figure 5 Wireless communication module working schematic view of the utility model;

[0035] In the figure 1. sleeve, 2. switch, 3. numerical increase key, 4. digital display module (0.91 inch display screen), 5. green LED indicator light, 6. red LED indicator light, 7. ratchet head, 8. metal handle, 9. buzzer, 10. control panel, 11. numerical decrease key, 12. setting button, 13. strain gauge, 14. internal connecting rod, 15. load sensor, 17. tail fixed end, 20. power module, 21. control main body, 22. holding handle, 23. power interface, 24. key module, 25. host computer or designated user terminal, 26. wireless communication module, 27. HX6002 single-chip microcomputer. DETAILED DESCRIPTION

[0036] In order to make the person in the art better understand the utility model scheme, the technical scheme of the utility model is clearly and completely described below through examples, but it should be understood that the described examples are only a part of the embodiment of the utility model, not all the examples. Based on the examples in the utility model, all other examples obtained by the person skilled in the art without creative labor should belong to the protection scope of the utility model.

[0037] Referring to Figures 1 to 5 As shown in the figure, the utility model includes: digital display module 4, power module 20, power interface 23, key module 24, wireless communication module 26, HX6002 single-chip microcomputer 27, load sensor 15 constitute the electronic part of torque wrench;Among them, load sensor 15 is connected with internal connecting rod 14, digital display module 4, power module 20, wireless communication module 26, key module 24, HX6002 single-chip microcomputer 27 are located in torque wrench control main body part 21, and power interface 23 is located in holding handle part 22;Single-chip microcomputer transmits the data handled through Bluetooth module to host computer or designated user terminal 25;The function that the intelligent torque wrench has has numerical display, sound and light prompt, preset torque value, unit switching, memory storage, power saving protection, calibration.

[0038] In some specific embodiments, the numerical display is OLED display screen display intelligent torque wrench current state, and can be set and mode switching of intelligent torque wrench through the key;Display screen interface can be divided into three blocks, the first block is in the top of display screen, and from left to right is in proper order last data serial number, last measured torque value, electric quantity;The second block is numerical display area, and from left to right is in proper order preset value display area, measured value display area;The third block is in the bottom of display screen and is unit area, and the unit used for this measurement is displayed.

[0039] In some embodiments, the sound and light prompt function is to emit corresponding sound and light prompt when the preset torque is reached and the corresponding setting is adjusted during the operation of the torque wrench. When the torque wrench is in operation, the green LED indicator 5 is on when the loaded torque is 80%-90% of the preset torque, the red LED indicator 6 is on when the loaded torque is 90%-100% of the preset torque, the buzzer 9 emits a beep-beep-beep sound, the red LED indicator 6 is on when the loaded torque exceeds the preset torque, and the buzzer 9 emits a long beep, and the measured value display area on the display screen flashes.

[0040] In some embodiments, the preset torque value is the maximum torque value of the torque wrench set in advance before operation. When the torque is preset, the set button 12 is pressed and held for a long time to enter the torque preset interface, the preset torque value is set by simultaneously pressing the number increase button 3 or the number decrease button 11 for a short time, the cursor position is switched to the units of one, ten, hundred, and ten by simultaneously pressing the set button 12 and the number increase button or the number decrease button 3, 11 for a short time, the overall torque value can be quickly increased or decreased by pressing and holding the number increase button 3 or the number decrease button 11, the preset value can be cleared by simultaneously pressing the number increase button 3 and the number decrease button 11 for a short time, and the torque value preset is completed by exiting the torque preset interface by pressing and holding the set button 12 after the setting is completed.

[0041] In some embodiments, the unit switching function is to switch between five torque units: N.m (Newton meter), lb.ft (foot pound), lb.in (inch pound), kgf.m (kilogram meter), and kgf.cm (kilogram centimeter). After starting, the initial unit is N.m (Newton meter), and the unit is switched by pressing the set button 12 for a short time, and the five torque units are switched in turn.

[0042] In some embodiments, the memory storage function is to automatically record the measured torque preset value. The memory storage interface is entered by pressing and holding the set button 12 and the number increase button 3, the last torque preset value is displayed after entering the interface, the torque preset value record can be viewed by simultaneously pressing the number increase button 3 and the number decrease button 11, the number record can be deleted by pressing and holding the number increase button 3 and the number decrease button 11, all historical records can be cleared by pressing and holding the set button 12 and the number increase button 3 and the number decrease button 11, and the memory storage interface is exited by pressing and holding the set button 12.

[0043] In some embodiments, the power saving protection function is a measure to save battery power and reduce power consumption. The torque information recorded is still retained when the intelligent torque wrench is not operated for three minutes, has no load value, or has a load value that does not change for six minutes. When the voltage is less than 2.2V, the buzzer emits an intermittent alarm sound, the screen displays a power icon that flashes, and the device automatically shuts down after one minute.

[0044] In some specific embodiments, the landmark calibration function is to calibrate the precision when the smart torque wrench is used for a long time and has fatigue loss, and the precision error occurs; when the numerical value increase and decrease keys 3, 11 are pressed for a long time, the calibration interface is entered, and in the calibration mode, five calibration points are preset, which are five equal points of the range in turn, the torque unit used in calibration is N.m, and after the calibration starts, the zero point is confirmed, the current zero point is confirmed by pressing the setting key twice without loading torque, after the zero point is confirmed, the torque is loaded to the five calibration values in turn, when the calibration value is reached, the display is stable, and the numerical value increase and decrease keys 3, 11 are pressed once to confirm the current calibration point, after the calibration is completed, the green light is lit for 3 seconds, and after the calibration is completed in turn, the calibration interface is automatically exited, and if the calibration is cancelled, the calibration interface can be exited by pressing the setting key 12 for a long time, and after the calibration is exited, the calibration test value is not saved.

[0045] As shown in Figure 1 , the digital display module 4, the sound and light module, the key module 24, the wireless communication module 26, and the power module 20 are connected with the HX6002 single-chip microcomputer 27 and located in the control main body part 21, the battery and the power interface 23 are located in the holding handle 22 to supply power to the entire circuit. The digital display module 4 adopts a 0.91-inch OLED screen to display related data; when the actual test value reaches the preset torque value of the torque wrench, the sound and light module sends a sound and light reminder, the sound and light module is composed of a buzzer 9 and LED indicator lights 5 and 6; the key module 24 has three keys 3, 11, and 12 in total; the wireless communication module 26 adopts a WL6601-TC Bluetooth module to transmit data with the host computer or the designated user terminal 25; four strain gauges 13 with the same resistance value form a Wheatstone full bridge, and when the torque wrench works, an electrical signal is generated and transmitted to the single-chip microcomputer for amplification and processing.

[0046] As shown in Figure 4 , the main structure of the wireless smart torque wrench based on the single-chip microcomputer is composed of a metal handle 8, a control main body part 21, and a holding handle 22, the front end is a metal ratchet head 7, the internal connecting rod 14 is connected with the metal ratchet head 7, and then the load sensor 15 and the tail fixed end 17 are connected in turn, the load sensor 15 is composed of four strain gauges 13 to detect the torque change transmitted by the ratchet head 7, and the ratchet head 7, the internal connecting rod 14, the load sensor 15, and the tail fixed end 17 form the metal handle 8 located inside the sleeve 1; the sleeve 1 wraps the metal handle 8 and carries the control panel 10 at the same time, the holding handle 22 is located at the end of the sleeve 1, and the charging port and the battery of the entire smart torque wrench are located at the holding handle 22; the control main body part 21 is the main place where the electronic parts of the smart torque wrench are concentrated, the HX6002 single-chip microcomputer 27, the digital display module 4, the sound and light module, the key module 24, the wireless communication module 26, and the power module 20 are all located in the control main body part 21, and the digital display module 4, the sound and light module, and the key module 24 together form the control panel 10.

[0047] As shown in Figure 3 , the control panel 10 is composed of a digital display module 4, a button module 24, and an audible and visual module, located at the sleeve 1 near the end of the ratchet head 7, the digital display module 4 is a 0.91-inch OLED display screen, which can be divided into a torque preset value area and a torque actual measurement value area, and displays the preset torque and the actual torque value during the operation of the torque wrench; the button module 24 is composed of a setting button 12, a numerical decrease button 3, and a numerical increase button 11, which can set and cancel the preset torque value and view the preset torque value record; the audible and visual module is composed of a first LED indicator light 5, a second LED indicator light 6, and a buzzer 9, when the intelligent torque wrench is charging, the red light is on, when it is fully charged, the green light is on, and when the actual torque value reaches the preset torque value during the operation, the red light is on and the buzzer 9 alarms at the same time.

[0048] As shown in Figure 1 , 5 , the wireless communication module 26 is a WL6001-TC Bluetooth module, which is a Bluetooth BLE5.0 module designed based on the WL6601 chip, and is designed with a universal serial port for programming and development, supports AT instructions to configure the serial port baud rate, supports duplex two-way communication, the HOST can perform two-way communication with the mobile device through the serial port of the module, the mobile device can transmit data to the HOST through the WL6001-TC module, and the HOST can also transmit data to the mobile device through the WL6001-TC module by writing data through the APP.

[0049] Before the intelligent torque wrench works, the operator can set the torque pre-value of the torque wrench at the operation panel, the upper computer or the designated user terminal 25. After the WL6001-TC Bluetooth module receives the transmitted torque pre-value information, the information is transmitted to the HX6002 single-chip microcomputer 27 for recording. The HX6002 single-chip microcomputer 27 transmits the set torque pre-value to the digital display module 4, and the digital display module 4 displays the torque pre-value in the pre-value area. When the torque wrench works, the front end of the ratchet head 7 is subjected to torsional stress. The internal ratchet of the ratchet head is deformed from torsion to bending, and the torque is converted into bending moment. The bending moment drives the internal connecting rod 14, which is then transmitted to the load sensor 15 by the internal connecting rod 14. When the load sensor 15 is subjected to bending moment, it is deformed. At this time, the strain gauge 13 attached to its surface is also deformed. After the strain gauge 13 is deformed, its resistance value changes. The Wheatstone full-bridge composed of four strain gauges 13 transmits the changed electrical signal to the HX6002 single-chip microcomputer 27. The single-chip microcomputer receives and amplifies the weak signal output by the load sensor 15, and performs amplification, analog-digital conversion, data processing and error correction. The processed electrical signal is converted into a measured torque value, which is transmitted by the HX6002 single-chip microcomputer 27 to the digital display module 4. The digital display module 4 displays the measured torque value in the measurement area and compares it with the preset torque value. When the measured torque value is equal to the preset torque value, the sound and light module works, the buzzer 9 issues an alarm, and the LED lights up red. The torque data generated in the above-mentioned torque wrench working process is transmitted to the upper computer or the designated user terminal 25 for recording through the wireless communication module 26. The torque change curve is drawn on the upper computer or the designated terminal. Thus, the working process of the wireless intelligent torque wrench based on the single-chip microcomputer is completed.

Claims

1. A single-chip microcomputer control-based wireless intelligent torque wrench, comprising a torque wrench composed of a metal handle, a control body and a holding handle, characterized in that: the metal handle comprises a front-end ratchet head, an internal connecting rod, an external metal sleeve, a load sensor and a tail fixed end, the front-end ratchet head is connected with the load sensor through the internal connecting rod, the load sensor is composed of four strain gauges with the same resistance, the four strain gauges R1, R2, R3 and R4 are respectively attached to the four faces of the transverse long side of the measurement position to form a Wheatstone full-bridge, when the torque wrench works, an electric signal is generated and transmitted to a single-chip microcomputer for amplification and processing; the control body comprises a single-chip microcomputer, a wireless communication module connected with the single-chip microcomputer, a power module and a control panel composed of a digital display module, a key module and an audible and visual module, the single-chip microcomputer transmits the data received and processed to the digital display module through the wireless communication module, the digital display module displays the measured torque value in the measurement area and compares it with the preset torque value, when the measured torque value is equal to the preset torque value, the audible and visual module sends an alarm and transmits it to the host computer or the designated user terminal through the wireless communication module for recording; the holding handle is provided with a power charging port connected with the power module.

2. The single-chip microcomputer control-based wireless intelligent torque wrench according to claim 1, characterized in that: The single-chip microcomputer adopts an HX6002 single-chip microcomputer; the HX6002 single-chip microcomputer has a cycle of 3T, an instruction set compatible with MCS-51, a working voltage range of 1.85-2.8V, a working current of 1200uA and a power-off current of 5uA; the single-chip microcomputer integrates AD acquisition and amplification, has a maximum gain of 128 and can amplify the tiny strain signal output by the load sensor.

3. The single-chip microcomputer control-based wireless intelligent torque wrench according to claim 1, characterized in that: The wireless communication module adopts a WL6601-TC Bluetooth module; the module is a full-duplex two-way communication, the user can perform two-way communication through the serial port of the module and a mobile device, the data processed by the single-chip microcomputer is transmitted to the host computer or the designated user terminal through the serial port, the module is read and written through an APP, and the preset torque is sent to the single-chip microcomputer through the serial port.

4. The single-chip microcomputer control-based wireless intelligent torque wrench according to claim 1, characterized in that: The control panel is composed of a digital display module, a key module and an audible and visual module; the digital display module adopts a 0.91-inch OLED display screen, the key module is composed of three keys arranged in a straight line, the audible and visual module is composed of two LED lamps and a buzzer, and the OLED display screen is located between the keys arranged in a straight line and the LED.

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