CN115046681A - Dynamic torque sensor calibration system - Google Patents

Abstract

The invention discloses a dynamic torque sensor calibration system, comprising: the device comprises a main body frame, a hydraulic system, a measuring system, a cooling system and a control system; the hydraulic system is positioned on the main body frame and used for providing a torque value for the measuring system; the measuring system is used for measuring the torque value of the dynamic torque sensor to realize dynamic calibration; the cooling system is used for cooling the hydraulic system; and the control system is used for acquiring data of the hydraulic system and the measuring system in real time and controlling the data. The invention solves the technical problem that the torque sensor cannot be dynamically calibrated.

Description

A dynamic torque sensor calibration system

technical field

The invention relates to the technical field of dynamic torque sensor calibration, and more particularly to a dynamic torque sensor calibration system.

Background technique

A torque sensor is a precision measuring instrument that measures various torques, rotational speeds and mechanical power. It has a wide range of applications and is mainly used for: detection of output torque and power of rotating power equipment such as electric motors, engines, and internal combustion engines; detection of torque and power of fans, water pumps, gearboxes, and torque wrenches; railway locomotives, automobiles, tractors, and airplanes , torque and power detection in ships and mining machinery; torque and power detection in sewage treatment systems; used in process industry and process industry testing.

Since the torque sensor is a precise measuring instrument, the torque sensor needs to be calibrated regularly. When measuring dynamic torque, static calibration of the torque sensor is not enough. Because a sensor with good static characteristics is not necessarily good for dynamic characteristics. A torque sensor may work well and reliably when measuring static forces, but be distorted or even inoperable when measuring dynamic torque. Therefore, it is very necessary to carry out the dynamic calibration of the dynamic force sensor to simulate the actual application state.

Due to the emergence of electro-hydraulic servo valve, the torque electro-hydraulic servo control system has appeared, which meets the requirements of load simulation automation and gradually replaces other loading methods. As the actuator of the calibration device, the electro-hydraulic servo system combines the advantages of electromagnetic and hydraulic, and has the characteristics of high control accuracy, fast response speed, convenient and flexible signal processing, large output power, compact structure and light weight.

Therefore, how to provide a dynamic torque sensor calibration system based on electro-hydraulic servo technology is an urgent problem to be solved by those skilled in the art.

SUMMARY OF THE INVENTION

In view of this, the present invention provides a dynamic torque sensor calibration system, which solves the technical problem that the torque sensor cannot be dynamically calibrated.

In order to achieve the above object, the present invention adopts the following technical solutions:

A dynamic torque sensor calibration system, comprising: a main body frame, a hydraulic system, a measurement system, a cooling system and a control system;

the hydraulic system is located on the main body frame for providing torque values to the measurement system;

The measuring system is used to measure the torque value of the dynamic torque sensor to realize dynamic calibration;

the cooling system is used for cooling the hydraulic system;

The control system is used to collect the data of the hydraulic system and the measurement system in real time and control the hydraulic system to realize dynamic torque sensor calibration.

Preferably, the hydraulic system includes a hydraulic source module, a servo valve, an actuator, a hydraulic beam and a displacement sensor, the hydraulic beam is mounted on the main body frame, and the actuator is fixed above the hydraulic beam, The servo valve is installed on one side of the actuator, the displacement sensor is coaxially installed inside the actuator, and the hydraulic pressure source module is connected to the servo valve for providing a hydraulic pressure source.

Preferably, the measurement system includes a standard dynamic torque sensor, a calibrated dynamic torque sensor and a data acquisition module, the standard dynamic torque sensor and the calibrated dynamic torque sensor are located under the hydraulic beam, and the standard dynamic torque The sensor is rigidly connected to the calibrated dynamic torque sensor, the calibrated dynamic torque sensor is rigidly connected to the main body frame, and the actuating end of the actuator is rigidly connected to the standard dynamic torque sensor through the hydraulic beam , the calibrated dynamic torque sensor is connected with the data acquisition module, the data acquisition module is connected in communication with the control system, and the standard dynamic torque sensor is connected in communication with the control system.

Preferably, the control system includes a signal amplifier, an A/D converter, a D/A converter and a digital controller, the signal amplifier is connected to the A/D converter, and the A/D converter is connected to the A/D converter. The digital controller, the digital controller is connected with the D/A converter, the D/A converter is connected with the servo valve, and is used for outputting control instructions, and the signal amplifier is respectively connected with the The displacement sensor is connected to the servo valve for collecting the displacement value of the displacement sensor and the pressure value and frequency response of the hydraulic source.

It can be seen from the above technical solutions that, compared with the prior art, the present invention provides a dynamic torque sensor calibration system, so that the calibration result can truly reflect the dynamic working actual performance of the torque sensor under test under working conditions. .

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to the provided drawings without creative work.

FIG. 1 is a schematic structural diagram of a dynamic torque sensor calibration system provided by the present invention.

Among them, 1. Hydraulic source module, 2. Servo valve, 3. Actuator, 4. Hydraulic beam, 5. Displacement sensor, 6. Standard dynamic torque sensor, 7. Calibrated dynamic torque sensor, 8. Signal generator , 9, D/A converter, 10, cooling system, 11, main frame.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The embodiment of the present invention discloses a dynamic torque sensor calibration system, as shown in FIG. 1 , including: a main body frame 11, a hydraulic system, a measurement system, a cooling system 10 and a control system; the hydraulic system is located on the main body frame 11 and is used for The measurement system provides the torque value; the measurement system is used to measure the torque value of the dynamic torque sensor to achieve dynamic calibration; the cooling system 10 is used to cool the hydraulic system; the control system is used to collect and control the data of the hydraulic system and the measurement system in real time.

The hydraulic system includes a hydraulic source module 1, a servo valve 2, an actuator 3, a hydraulic beam 4, and a displacement sensor 5. The hydraulic beam 4 is installed on the main frame 11, the actuator 3 is fixed above the hydraulic beam 4, and the actuator 3. The actuating end is rigidly connected to the standard dynamic torque sensor 6 through the hydraulic beam 4, and is used to apply the required torque to the series-connected standard dynamic torque sensor and the calibrated dynamic torque sensor. The servo valve 2 is installed on the side of the actuator 3. A displacement sensor 5 is installed coaxially inside the actuator 3 , and the hydraulic source module 1 is connected to the servo valve 2 for providing a hydraulic source.

Among them, the hydraulic beam 4 is lifted and clamped by the hydraulic source module 1, and is equipped with a mechanical locking device; the actuator is placed on the top to apply the required torque and displacement to the component.

In order to ensure the accuracy of the control system, servo valve 2 selects a two-stage flow control servo valve with a mechanical feedback pilot stage. This series of electro-hydraulic servo valves can be used as three-way and four-way throttling flow control valves. They have the characteristics of fast response, anti-pollution, high static resolution, and cooperate with the control system to ensure the dynamic range of the testing machine. performance.

The invention adopts the parallel structure of two valves to improve the flow rate and control precision of the system. The output stage of the servo valve is a closed-center four-way spool valve; the pilot stage is a double-nozzle flapper valve. Used in automatic control systems such as position control, speed control, force control, torque control, etc.

An oil tank is provided in the hydraulic source module, the oil tank is provided with an air filter, a temperature sensor for oil temperature measurement, a liquid level gauge, an oil return oil filter and its blockage alarm device, and a seal is provided on the oil tank to prevent dust from entering the oil tank , In order to control the oil temperature of the test system, large-capacity water cooling is used. The oil source is equipped with an oil temperature upper and lower limit adjustable temperature controller, and oil cooling is performed by controlling the on-off of the electromagnetic water valve at the water outlet of the water cooler.

The cooling system 10 adopts a circulating water cooling system.

Further, displacement sensor 5 selects intelligent displacement sensor, high-speed, two-wire data transmission, built-in diagnostic program, self-check, status report, with 2um resolution, with position and speed output, can be networked, and a bus system can accommodate up to 32 devices, multiple position measurements, 5-point positioning, and a maximum rate of 1Mbit/sec.

The measurement system includes a standard dynamic torque sensor 6, a calibrated dynamic torque sensor 7 and a data acquisition module, the standard dynamic torque sensor 6 and the calibrated dynamic torque sensor 7 are located under the hydraulic beam 4, and the standard dynamic torque sensor 6 and the calibrated dynamic torque sensor are rigid. Connection, the calibrated dynamic torque sensor 7 is rigidly connected with the bottom of the main frame 11, the calibrated dynamic torque sensor 7 is connected with the data acquisition module, and the data acquisition module is connected with the control system.

Preferably, the control system includes a signal amplifier 8, an A/D converter, a D/A converter 9 and a digital controller. The signal amplifier 8 is connected to the displacement sensor 5 for collecting the displacement value of the displacement sensor, and the signal is amplified The device 8 is connected to the servo valve 2 for collecting the pressure value and frequency response of the hydraulic source module. The control system is connected with the standard dynamic torque sensor 6 for collecting the applied dynamic torque value and feeding back the torque value in real time. The specific process is: the displacement sensor 5, the standard dynamic torque sensor 6, the calibrated dynamic torque sensor 7, the signals are input to the digital controller through the amplifier circuit and the A/D converter, and the digital controller makes a difference between the input command and the processed sensor input signal After the output command is obtained, the D/A converter converts the above output command into an analog quantity, and then the analog quantity is amplified by the analog circuit, and the output command is sent to the servo valve, so that the hydraulic cylinder can make the input command as required. Actions.

The working process of the present invention is:

The control system controls the liquid pressure generated by the hydraulic system through pressure control, and controls the actuator through the servo valve. Various sensors collect the measured value in real time and feed it back to the control system to form a closed-loop control. The actuator applies the torque value to the standard torque sensor. The torque sensor and the measured torque sensor are rigidly connected, and the torque values of the two torque sensors can be collected synchronously through the measurement system. Therefore, the measured torque sensor and the standard torque sensor are static, steady or dynamic, and the torque values of the two torque sensors are at different frequencies. The measurement can be compared in real time.

The method of gain self-tuning is used to adjust the force control system. Its working process is: when the difference between the current value and the given value is greater than a certain set value, the control system adopts a given gain to speed up the adjustment process; The smaller the difference, the smaller the gain, so as to ensure the loading accuracy. Speed up the loading process while maintaining steady-state loading accuracy.

The invention controls the dynamic force of sine wave, triangular wave and square wave through the steady-state force source of electro-hydraulic servo, and has a dynamic effect on the standard and measured torque sensor connected in rigid series, and the dynamic effect on the standard torque sensor, the measured torque sensor and the data The dynamic measuring instrument composed of the acquisition module is calibrated, and the dynamic torque value is collected in real time to verify the dynamic characteristics of the measured torque sensor and realize the acquisition and calibration of the dynamic torque.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant part can be referred to the description of the method.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (4)

1. A dynamic torque sensor calibration system, comprising: the device comprises a main body frame, a hydraulic system, a measuring system, a cooling system and a control system;

the hydraulic system is positioned on the main body frame and used for providing a torque value for the measuring system;

the measuring system is used for measuring the torque value of the dynamic torque sensor to realize dynamic calibration;

the cooling system is used for cooling the hydraulic system;

the control system is used for acquiring data of the hydraulic system and the measuring system in real time and controlling the hydraulic system to realize calibration of the dynamic torque sensor.

2. The dynamic torque sensor calibration system as claimed in claim 1, wherein the hydraulic system comprises a hydraulic source module, a servo valve, an actuator, a hydraulic beam and a displacement sensor, the hydraulic beam is mounted on the main body frame, the actuator is fixed above the hydraulic beam, the servo valve is mounted on one side of the actuator, the displacement sensor is coaxially mounted inside the actuator, and the hydraulic source module is connected with the servo valve for providing a hydraulic source.

3. The dynamic torque sensor calibration system of claim 2, the measuring system comprises a standard dynamic torque sensor, a calibrated dynamic torque sensor and a data acquisition module, the standard dynamic torque sensor and the calibrated dynamic torque sensor are located below the hydraulic beam, and the standard dynamic torque sensor and the calibrated dynamic torque sensor are rigidly connected, the calibrated dynamic torque sensor and the main body frame are rigidly connected, the actuating end of the actuator passes through the hydraulic cross beam and is rigidly connected with the standard dynamic torque sensor, the calibrated dynamic torque sensor is connected with the data acquisition module, the data acquisition module is in communication connection with the control system, and the standard dynamic torque sensor is in communication connection with the control system.

4. The dynamic torque sensor calibration system of claim 3, wherein the control system comprises a signal amplifier, an A/D converter, a D/A converter and a digital controller, the signal amplifier is connected to the A/D converter, the A/D converter is connected to the digital controller, the digital controller is connected to the D/A converter, the D/A converter is connected to the servo valve for outputting control commands, and the signal amplifier is respectively connected to the displacement sensor and the servo valve for respectively acquiring displacement values of the displacement sensor and pressure values and frequency responses of the hydraulic pressure source.

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