CN205786690U - Multichannel calibrating device for rotational speed sensor - Google Patents

Abstract

The utility model discloses a multi-channel rotational speed sensor calibration device, which comprises a rotational speed standard device (2), a sensor installation fixture, an NI acquisition card, a PC, and a rotational speed sensor to be calibrated (3); wherein, the rotational speed standard device (2) is used for To drive the gear plate to be tested (1) to rotate, the sensor installation fixture is set on the circumferential direction of the gear plate to be tested, and the four rotational speed sensors (3) to be calibrated are evenly set on the sensor installation fixture in the circumferential direction, and are respectively connected by the NI acquisition card and The PC is connected. It is difficult for the utility model to accurately measure low-speed signals by using a digital multimeter, and a pertinent algorithm is proposed for different speed characteristics to realize wide-band speed measurement. The utility model greatly improves the work efficiency, measurement accuracy and instrument automation degree of the rotating speed sensor verification, and has high economic value and popularization value.

Description

Multi-channel speed sensor calibration device

Technical field:

The utility model relates to a calibration device for a multi-channel rotational speed sensor, which is suitable for precise calibration of industrial rotational speed sensors in power plants.

Background technique:

With the acceleration of industrial automation in the power plant industry, the application and installation of speed sensors are increasing year by year. For the measurement of sensor output signals, digital multimeters are mostly used for measurement at the frequency range (the dimension of frequency and speed is the same, expressed as [ T ^-1 ]), the digital multimeter has a large error in low-speed measurement, which cannot meet the needs. Another digital frequency meter can only calibrate one sensor. The data needs to be recorded manually, and the work efficiency is low. Due to the large amount of data that needs to be recorded , the number of data digits is large, and it is easy to make mistakes when recording manually.

Utility model content:

The purpose of the utility model is to improve the working efficiency and the accuracy of the measurement, and provide a multi-channel speed sensor detection device, which can realize the wide-band speed measurement that cannot be realized by the frequency counter, and abandon the one-to-one measurement method of the traditional desktop frequency meter , the use of virtual instrument technology can realize the measurement of multi-channel speed sensors, saving costs, and at the same time output the measurement results report to improve work efficiency.

In order to achieve the above object, the utility model adopts the following technical solutions to realize:

Multi-channel rotational speed sensor calibration device, including rotational speed standard device, sensor installation fixture, NI acquisition card, PC and the rotational speed sensor to be calibrated; among them,

The speed standard device is used to drive the rotation of the gear disc to be tested. The sensor installation fixture is set on the circumferential direction of the gear disc to be tested. connected.

The further improvement of the utility model is that the speed standard device includes a motor base, a motor installed on the motor base and a speed controller for controlling its rotation.

The further improvement of the utility model is that the sensor installation fixture includes an annular bracket and four fixtures uniformly distributed in the circumferential direction and fixed on the annular bracket, and the four speed sensors to be calibrated are respectively installed on the annular bracket through a fixture.

The further improvement of the utility model lies in that the four clamps are all fixed on the ring support uniformly distributed in the circumferential direction by screws, and the ring support is fixed on the motor table body by screws.

Compared with the prior art, the beneficial effects of the utility model are:

1. For the calibration of the speed sensor, the original calibration method of single-channel digital multimeter collection and manual recording and processing data is updated to an automatic calibration method of four-channel data collection, computer processing results and generating reports;

2. It is difficult to accurately measure low-speed signals by using a digital multimeter, and a targeted algorithm is proposed for different speed characteristics to achieve broadband speed measurement. The utility model greatly improves the work efficiency, measurement accuracy and instrument automation degree of the rotating speed sensor verification, and has high economic value and popularization value.

Description of drawings:

Fig. 1 system block diagram of multi-channel rotational speed sensor calibration device;

Fig. 2 Schematic diagram of the structure of the sensor installation fixture;

Fig. 3 block diagram of acquisition part of NI acquisition card.

detailed description:

Below in conjunction with accompanying drawing, the utility model is further described.

The system block diagram of the utility model is shown in Figure 1 below: it includes a speed standard device 2, a sensor installation fixture, an NI acquisition card, a PC, and a speed sensor 3 to be calibrated; wherein, the speed standard device 2 is used to drive the gear disc 1 to be tested to rotate, The sensor installation fixture is arranged on the circumferential direction of the gear disc to be tested, and the four calibrated speed sensors are evenly arranged on the sensor installation fixture in the circumferential direction, and are respectively connected to the PC through the NI acquisition card. Wherein, the speed standard device 2 includes a motor base 202, a motor 201 installed on the motor base 202, and a speed controller for controlling its rotation, and the sensor installation fixture includes a ring bracket 4 and circumferentially uniformly fixed on the ring bracket 4. Four clamps 5, four speed sensors 3 to be calibrated are installed on the ring support 4 through one clamp 5 respectively.

During work, the four calibrated speed sensors 3 are installed on the ring bracket 4 through the clamp 5, the ring bracket 4 is installed on the motor body 202, the output of the calibrated speed sensors 3 is connected to the NI acquisition card, and the speed standard device 2 gives the standard Speed value, data acquisition after the speed is stable, according to the standard speed value, select the measurement mode, use the cycle measurement method for low speed, and use the frequency measurement method for high speed, calculate the measurement results of the sensor, store and display on the virtual panel, measure End the report output function in EXCEL format.

In Fig. 1, the utility model mainly completes all designs behind the speed standard device, and its implementation is as follows:

1. The design of the sensor fixture: In order to protect the main body of the motor, the utility model adds a ring bracket 4, which is fixed on the motor table body 202 by the original 4 screws, and then drills holes in the upper and lower directions of the ring bracket 4 and installs the fixture 5, as shown in Figure 2.

2. Measurement method: the output of the speed sensor 3 to be calibrated is connected to the input end of the AD converter and the counter, and the block diagram of the acquisition part is shown in Figure 3. Combining the timing counting method (that is, the frequency measurement method, the measurement error is large at low speeds) and the fixed count timing method (that is, the cycle measurement method, the measurement error is large at high speeds) to ensure the measurement accuracy within the entire speed range.

The technical route of the present utility model is as follows:

1. On the motor body 202, design a new sensor fixture 5 to meet the installation of the four calibrated speed sensors 3;

2. Use the NI acquisition card to complete the acquisition of the output signal of the calibrated speed sensor 3, and convert the analog signal into a digital signal;

3. The NI acquisition card establishes communication with the upper computer, and measures the corresponding frequency through the combination method of cycle measurement and frequency measurement, converts the digital signal into the corresponding speed value, and completes the collection and display of the speed signal.

Claims (4)

1. The calibration device of the multi-channel rotating speed sensor is characterized by comprising a rotating speed standard device (2), a sensor mounting clamp, an NI acquisition card, a PC (personal computer) and a calibrated rotating speed sensor (3); wherein,

the rotation speed standard device (2) is used for driving the gear disc (1) to be tested to rotate, the sensor mounting fixture is arranged on the circumferential direction of the gear disc to be tested, and the four calibrated rotation speed sensors (3) are uniformly arranged on the sensor mounting fixture in the circumferential direction and are respectively connected with the PC through the NI acquisition card.

2. The calibration device of multi-channel revolution speed sensor according to claim 1, characterized in that the revolution speed standard device (2) comprises a motor table body (202), a motor (201) mounted on the motor table body (202), and a revolution speed controller for controlling the revolution speed thereof.

3. The calibration device for the multi-channel revolution speed sensor according to the claim 2, characterized in that the sensor mounting fixture comprises a ring-shaped support (4) and four fixtures (5) which are uniformly distributed and fixed on the ring-shaped support (4) in the circumferential direction, and the four revolution speed sensors (3) to be calibrated are respectively mounted on the ring-shaped support (4) through one fixture (5).

4. The calibration device for the multi-channel rotating speed sensor is characterized in that four clamps (5) are uniformly distributed and fixed on the annular support (4) in the circumferential direction through screws, and the annular support (4) is fixed on the motor table body (202) through screws.