CN210255911U - Electric torque wrench for tower bolt - Google Patents
Electric torque wrench for tower bolt Download PDFInfo
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- CN210255911U CN210255911U CN201920650925.9U CN201920650925U CN210255911U CN 210255911 U CN210255911 U CN 210255911U CN 201920650925 U CN201920650925 U CN 201920650925U CN 210255911 U CN210255911 U CN 210255911U
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- 230000005669 field effect Effects 0.000 claims description 3
- 239000013598 vector Substances 0.000 abstract description 16
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Abstract
A tower bolt electric torque wrench comprises an output shaft, a start-stop switch, a driving motor, a torque control system and a human-computer interaction interface; the torque control system comprises a microcontroller, a current acquisition module, a rotating speed calculation module, a motor driving module and a communication module, wherein the microcontroller is respectively connected with the current acquisition module, the rotating speed calculation module, the motor driving module and the communication module; the current acquisition module is used for acquiring current signals when the motor works; the rotating speed calculating module calculates the current rotating speed of the motor in real time; the motor driving module is connected to the driving motor; the communication module is connected to the man-machine interaction interface and receives parameter information input by an operator on the man-machine interaction interface. The utility model discloses a set up rotational speed calculation module and current acquisition module, according to measured motor speed and motor stator electric current, calculation motor moment of torsion and magnetic linkage select the voltage vector when objective function value is minimum as the optimal voltage vector, make the spanner have the moment of torsion of high accuracy.
Description
Technical Field
The utility model relates to a shaft tower bolt electric torque wrench belongs to electric torque wrench technical field.
Background
When the pole tower bolt is fastened, high requirements are provided for the fastening torque value and the fastening precision. On the one hand, if the torque value is too large, the bolt may be stretched or brittle; on the other hand, if the torque value is too small, the bolt may loosen. In addition, at the high position of the power transmission iron tower, wind disturbance is large, the oscillation amplitude of the iron tower is increased, and safety risk is prominent, so that high-precision control on torque is required.
Electric torque wrenches of the prior art are typically either current or impact. The current type electric wrench has a large fluctuation in output torque because the current sharply rises at the moment of bolt fastening. The impact type electric torque wrench is used for regularly twisting by time or impact times, the impact device is used for frequently impacting the bolt for multiple times, the screwing torque is formed through accumulation, and the control precision is low. For example, chinese patent publication No. CN108188968A discloses "a method for controlling an electric impact wrench and an assembly torque thereof," which converts a set power and a set impact frequency into a corresponding target torque value by inputting the torque and the impact frequency, and performs count control until the set torque value and the impact frequency are reached after a seating torque is reached. The mode of accumulating the torque by adopting multiple times of striking has the defect that the preset torque is achieved, and the torque control precision is low because the effect time of each striking is influenced by the surface roughness and the hardness of a collision surface, the rigidity and the pressure of a spring, the rigidity of a transmission gear, the tooth clearance and other system rigidity of a workpiece or the rigidity of a workpiece system.
SUMMERY OF THE UTILITY MODEL
The aforesaid that exists to prior art is not enough, the utility model aims to solve current electric spanner torque control precision lower, undulant great defect, provide a shaft tower bolt electric torque wrench of high accuracy control output moment of torsion.
In order to achieve the purpose, the utility model discloses a tower bolt electric torque wrench, which comprises an output shaft, a start-stop switch, a driving motor, a torque control system and a human-computer interaction interface; the torque control system comprises a microcontroller, a current acquisition module, a rotating speed calculation module, a motor driving module and a communication module, wherein the microcontroller is respectively connected with the current acquisition module, the rotating speed calculation module, the motor driving module and the communication module; the current acquisition module is used for acquiring a current signal when the motor works and transmitting the current signal to the microcontroller; the rotating speed calculating module calculates the current rotating speed of the motor in real time according to signals of a Hall sensor on a motor stator and transmits the current rotating speed to the microcontroller, and the Hall sensor is used for detecting the real-time position of a motor rotor tooth; the motor driving module is connected to the driving motor, and the microcontroller controls the motor driving module to enable the driving motor to work; the communication module is connected to the human-computer interaction interface, receives parameter information input by an operator on the human-computer interaction interface and transmits the parameter information to the microcontroller.
More specifically, the parameter information input by the operator on the man-machine interface comprises a wrench target torque value or a wrench torque gear value.
Furthermore, the tower bolt electric torque wrench is provided with a power supply battery, and the power supply battery is connected to the microcontroller and the driving motor and supplies power to the driving motor and the torque control system.
Still further, the motor driving module includes an inverter circuit composed of a diode and a power field effect transistor.
The working principle of the pole tower bolt electric torque wrench is as follows:
the microcontroller obtains a wrench target torque value according to parameter information input by an operator on a human-computer interaction interface, and then controls a motor driving module to enable a driving motor to start working; the microprocessor calculates a stator target flux linkage value according to the wrench target torque value, and the calculation formula is as follows:
wherein psifIs the flux linkage value of the permanent magnet of the rotor,
the torque value is a target torque value of the wrench, Lq is stator coil quadrature axis inductance, and p is a pole pair number;
the rotating speed calculation module and the current acquisition module calculate and measure the motor rotating speed and the motor stator current at the current moment; the microprocessor calculates the current motor torque and flux linkage according to the measured motor rotating speed and the measured motor stator current at the current moment, and predicts the motor torque and flux linkage at the next moment under different voltage vectors according to the current motor torque and flux linkage and an Euler method and a mathematical model of the permanent magnet synchronous motor;
the mathematical model of the permanent magnet synchronous motor is as follows:
the torque of the permanent magnet synchronous motor is as follows:
where p is a differential operator, isIs stator current, Rs、LsIs the motor stator resistance, inductance, omegarFor the motor speed, #fIs the flux linkage value of the rotor permanent magnet, usAs stator voltage vector, #sIs the stator flux linkage value, pPThe number of pole pairs of the motor is;
the microprocessor constructs an objective function:
wherein the content of the first and second substances,
respectively a target torque value of the wrench and a target flux linkage value of the stator, psisIs the stator flux linkage value, T, at the next momenteIs the output torque value, k, at the next momentψIs a weight coefficient;
the microprocessor calculates objective function values under different voltage vectors according to the target torque value and the sub-target flux linkage value of the rule and the predicted motor torque value and flux linkage value at the next moment;
the microprocessor selects the voltage vector with the minimum objective function value as the optimal voltage vector, and selects the optimal voltage vector as the voltage at the next moment;
and repeating the steps until the target torque value of the wrench is reached.
Adopt the technical scheme provided by the utility model, compare with prior art, have following effect:
through setting up rotational speed calculation module and current acquisition module, according to motor rotational speed and motor stator current of measurement, calculate motor moment of torsion and magnetic linkage, select the voltage vector when the objective function value is minimum as optimum voltage vector, make the spanner have the moment of torsion of high accuracy.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural connection diagram of a torque control system of a tower bolt electric torque wrench of the present invention;
Detailed Description
The technical scheme of the utility model is further explained by combining the attached drawings as follows:
the utility model discloses a shaft tower bolt electric torque wrench includes the output shaft, opens and stops switch, driving motor, torque control system and human-computer interaction interface.
The structural connection schematic diagram of the torque control system of the tower bolt electric torque wrench is shown in fig. 1.
The torque control system comprises a microcontroller, a current acquisition module, a rotating speed calculation module, a motor driving module and a communication module, wherein the microcontroller is respectively connected with the current acquisition module, the rotating speed calculation module, the motor driving module and the communication module; the current acquisition module is used for acquiring a current signal when the motor works and transmitting the current signal to the microcontroller; the rotating speed calculating module calculates the current rotating speed of the motor in real time according to signals of a Hall sensor on a motor stator and transmits the current rotating speed to the microcontroller, and the Hall sensor is used for detecting the real-time position of a motor rotor tooth; the motor driving module is connected to the driving motor, and the microcontroller controls the motor driving module to enable the driving motor to work; the communication module is connected to the human-computer interaction interface, receives parameter information input by an operator on the human-computer interaction interface and transmits the parameter information to the microcontroller.
More specifically, the parameter information input by the operator on the man-machine interface comprises a wrench target torque value or a wrench torque gear value.
Furthermore, the tower bolt electric torque wrench is provided with a power supply battery, and the power supply battery is connected to the microcontroller and the driving motor and supplies power to the driving motor and the torque control system.
Still further, the motor driving module includes an inverter circuit composed of a diode and a power field effect transistor.
The working principle of the pole tower bolt electric torque wrench is as follows:
the microcontroller obtains a wrench target torque value according to parameter information input by an operator on a human-computer interaction interface, and then controls a motor driving module to enable a driving motor to start working; the microprocessor calculates a stator target flux linkage value according to the wrench target torque value, and the calculation formula is as follows:
wherein psifIs the flux linkage value of the permanent magnet of the rotor,
the torque value is a target torque value of the wrench, Lq is stator coil quadrature axis inductance, and p is a pole pair number;
the rotating speed calculation module and the current acquisition module calculate and measure the motor rotating speed and the motor stator current at the current moment; the microprocessor calculates the current motor torque and flux linkage according to the measured motor rotating speed and the measured motor stator current at the current moment, and predicts the motor torque and flux linkage at the next moment under different voltage vectors according to the current motor torque and flux linkage and an Euler method and a mathematical model of the permanent magnet synchronous motor;
the mathematical model of the permanent magnet synchronous motor is as follows:
the torque of the permanent magnet synchronous motor is as follows:
where p is a differential operator, isIs stator current, Rs、LsIs the motor stator resistance, inductance, omegarFor the motor speed, #fIs the flux linkage value of the rotor permanent magnet, usAs stator voltage vector, #sIs the stator flux linkage value, pPThe number of pole pairs of the motor is;
the microprocessor constructs an objective function:
wherein the content of the first and second substances,
respectively a target torque value of the wrench and a target flux linkage value of the stator, psisIs the stator flux linkage value, T, at the next momenteIs the output torque value, k, at the next momentψIs a weight coefficient;
the microprocessor calculates objective function values under different voltage vectors according to the target torque value and the sub-target flux linkage value of the rule and the predicted motor torque value and flux linkage value at the next moment;
the microprocessor selects the voltage vector with the minimum objective function value as the optimal voltage vector, and selects the optimal voltage vector as the voltage at the next moment;
and repeating the steps until the target torque value of the wrench is reached.
The utility model discloses an in the embodiment, when setting for the target torque value and be 420N · m, the torque error of spanner actual output is less than 3%, has higher output torque precision, for current impact type electric spanner 10% -20%'s error, has great promotion to pole tower bolt-up torque precision.
While the embodiments of the present invention have been illustrated and described in detail in the drawings attached to the specification, it will be understood by those skilled in the art that the above embodiments are only preferred embodiments of the present invention, and the detailed description is only for the purpose of helping the reader to better understand the spirit of the present invention, and not for the limitation of the protection scope of the present invention, on the contrary, any improvement or modification made based on the spirit of the present invention should fall within the protection scope of the present invention.
Claims (4)
1. A tower bolt electric torque wrench comprises an output shaft, a start-stop switch, a driving motor, a torque control system and a human-computer interaction interface; the method is characterized in that:
the torque control system comprises a microcontroller, a current acquisition module, a rotating speed calculation module, a motor driving module and a communication module, wherein the microcontroller is respectively connected with the current acquisition module, the rotating speed calculation module, the motor driving module and the communication module; the current acquisition module is used for acquiring a current signal when the motor works and transmitting the current signal to the microcontroller; the rotating speed calculating module calculates the current rotating speed of the motor in real time according to signals of a Hall sensor on a motor stator and transmits the current rotating speed to the microcontroller, and the Hall sensor is used for detecting the real-time position of a motor rotor tooth; the motor driving module is connected to the driving motor, and the microcontroller controls the motor driving module to enable the driving motor to work; the communication module is connected to the human-computer interaction interface, receives parameter information input by an operator on the human-computer interaction interface and transmits the parameter information to the microcontroller.
2. The tower bolt electric torque wrench as claimed in claim 1, characterized in that: the parameter information input by the operator on the man-machine interaction interface comprises a spanner target torque value or a spanner torque gear value.
3. The tower bolt electric torque wrench as claimed in claim 1, characterized in that: the tower bolt electric torque wrench is provided with a power supply battery, and the power supply battery is connected to the microcontroller and the driving motor and supplies power for the driving motor and the torque control system.
4. The tower bolt electric torque wrench as claimed in claim 1, characterized in that: the motor driving module comprises an inverter circuit formed by a diode and a power field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920650925.9U CN210255911U (en) | 2019-05-08 | 2019-05-08 | Electric torque wrench for tower bolt |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920650925.9U CN210255911U (en) | 2019-05-08 | 2019-05-08 | Electric torque wrench for tower bolt |
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| CN210255911U true CN210255911U (en) | 2020-04-07 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109986494A (en) * | 2019-05-08 | 2019-07-09 | 国网河南省电力公司电力科学研究院 | A kind of shaft tower bolt Electric torque wrench and its control method |
| CN114320189A (en) * | 2020-09-29 | 2022-04-12 | 宝山钢铁股份有限公司 | Screwing control method of threaded pipe joint |
| CN115338820A (en) * | 2022-09-13 | 2022-11-15 | 广西电网有限责任公司来宾供电局 | Electric wrench for insulating rod, control method and electronic equipment |
-
2019
- 2019-05-08 CN CN201920650925.9U patent/CN210255911U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109986494A (en) * | 2019-05-08 | 2019-07-09 | 国网河南省电力公司电力科学研究院 | A kind of shaft tower bolt Electric torque wrench and its control method |
| CN109986494B (en) * | 2019-05-08 | 2024-04-16 | 国网河南省电力公司电力科学研究院 | Electric torque wrench for tower bolt and control method thereof |
| CN114320189A (en) * | 2020-09-29 | 2022-04-12 | 宝山钢铁股份有限公司 | Screwing control method of threaded pipe joint |
| CN115338820A (en) * | 2022-09-13 | 2022-11-15 | 广西电网有限责任公司来宾供电局 | Electric wrench for insulating rod, control method and electronic equipment |
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