Principle of the hottest torque sensor

2022-08-03
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Principle of torque sensor

1. Application range:

torque sensor is a precision measuring instrument for measuring various torques, rotating speeds and mechanical power. It has a wide range of applications, mainly used for:

1, output torque and power detection of rotating power equipment such as motors, engines and internal combustion engines

2. Detection of torque and power of fan, water pump, gear box and torque wrench

3. Detection of torque and power in railway locomotives, automobiles, tractors, aircraft, ships and mining machinery

4. It can be used to detect torque and power in sewage treatment system

5. It can be used for manufacturing. 3. The control cabinet and components of the equipment should keep enough space viscometers for inspection and maintenance

6. It can be used in process industry and process industry

II. Basic principle:

torque measurement: the strain bridge is formed on the elastic shaft by using the strain gauge electrical measurement technology, and the electrical signal of the torsion of the elastic shaft can be measured by supplying power to the strain bridge. After the strain signal is amplified, it becomes a frequency signal proportional to the torsional strain after pressure/frequency conversion. As shown in Figure 1:

III. product features:

1 The waveform of signal output can be arbitrarily selected - square wave or pulse wave

2. High detection accuracy, good stability and strong anti-interference

3. It is not necessary to adjust zero repeatedly; Continuously measure the positive and negative torque

4. Both static torque and dynamic torque can be measured

5. The small and heavy sensor can be used independently from the secondary instrument. As long as the power supply of +15v, -15v (200mA) is provided according to the pin number of the socket, the equal square wave or pulse wave frequency signal whose impedance is proportional to the torque can be output. Light weight and easy installation

6. Measurement range: 0-10000nm standard optional, non-standard 20000 nm, 30000 nm, 50000 nm, 80000 nm, 100000 nm, 150000 nm, 200000 nm, 500000 nm, 1million nm, 2million nm can be customized, and special range can be customized

IV Main functions and performance indicators:

torque indication error: <0.5% f · s sensitivity: 1 ± 0.2 MV/v

nonlinearity: <0.25% f · s repeatability: <0.2% f · s

return error: <0.2% f · s zero drift (24 hours) : < 0.5% f · s

zero temperature drift: < 0.5% f · s/10 ℃ output impedance: 1K Ω± 3 Ω

insulation impedance:>500m Ω static overload: 120%

breaking load: 200% service temperature: 0 ~ 60 ℃

storage temperature: - 20 ~ 70 ℃ power supply voltage: +15v ± 5%, -15V ± 5%

total consumed current: <130mA frequency signal output: 5khz-15khz

negative rated torque: 5KHz ± 10Hz zero torque: 10kHz ± 10hz

positive rated torque: 15KHz ± 10Hz signal duty cycle: (50 ± 10)%

v. installation and use: installation steps:

1 Determine the distance between the prime mover and the load according to the connection form of the shaft and the length of the torque sensor, and adjust the distance between the axes of the prime mover and the load relative to the reference plane so that the coaxiality of their axes is less than Φ 0.03mm, fix the prime mover and load on the reference plane

2. Install the couplings onto their respective shafts

3. Adjust the distance between the torque sensor and the reference plane so that the coaxiality between its axis and the axis of the prime mover and load is less than Φ 0.03mm, fix the torque sensor on the reference plane

4. Tighten the coupling and complete the installation

VI. signal output and signal acquisition:

1. Basic form of torque signal output:

square wave signal and pulse signal

It will make the oil pump and pipeline produce noise and vibration

it can be made into voltage analog signal output or current analog signal output (unidirectional, static torque measurement) according to the needs of users

2. Torque signal processing form:

the frequency signal output by the torque sensor is sent to the frequency meter or digital meter to directly read the frequency signal or voltage and current signal proportional to the torque

the torque and frequency signals of the torque sensor are sent to the secondary instrument of the single-chip microcomputer to directly display the real-time torque value, speed, output power value and RS232 communication signal

directly send the frequency signals of torque and speed to the computer or PLD for processing

VII. Maintenance:

1 Grease the bearings at both ends of the torque sensor in August 2016 every other year. When adding grease, only open the bearing covers at both ends, add grease to the bearings, and then install the covers at both ends

2. It shall be stored in a dry, corrosion-free environment with a room temperature of -20 ℃ - 70 ℃

VIII. Precautions:

1 During installation, do not operate with electricity. Do not knock or impact the sensor directly

2. The fastening bolts of the coupling shall be tightened, and the outside of the coupling shall be provided with a protective cover to avoid personal injury

3. The output of the signal line shall not be short circuited to the ground or the power supply. The shielding layer of the shielded cable with an output current not greater than 10mA must be connected to the common end (power ground) of the +15v power supply

IX. installation and use:

1. Use environment: the torque sensor should be installed in an environment with an ambient temperature of 0 ℃ ~ 60 ℃, a relative humidity of less than 90% and no inflammables and explosives. It should not be installed in the environment with strong electromagnetic interference

2. Installation method:

(1) horizontal installation: as shown in the figure:

(2) vertical installation: as shown in the figure:

3. Connection method: the connection between torque sensor and power equipment and load equipment

(1) the connection of elastic pin coupling is as shown in the figure. This connection method has simple structure, easy processing and convenient maintenance. It can slightly compensate the relative offset of the shaft caused by the installation error, and play the role of slight vibration reduction at the same time. It is suitable for high and low speed operation occasions with medium load and frequent starting. The working temperature is - ℃

(2) the rigid coupling connection is shown in the figure. This connection form has simple structure, low cost, no compensation performance, can not buffer vibration, and has high installation accuracy for two shafts. It is used for working conditions with little vibration

4. Installation requirements:

(1) the torque sensor can be installed horizontally or vertically

(2) as shown in figures 11 and 12, the power equipment, sensors and load equipment shall be installed on a solid foundation to avoid excessive vibration, otherwise the data may be unstable, the measurement accuracy may be reduced, and even the sensor may be damaged

(3) connect with elastic pin coupling or rigid coupling

(4) the concentricity of axes of power equipment, sensors and load equipment shall be less than Φ 0.05mm。 (end)

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