CN205786690U

CN205786690U - Multichannel calibrating device for rotational speed sensor

Info

Publication number: CN205786690U
Application number: CN201620651286.4U
Authority: CN
Inventors: 韦宣; 史亚丽; 刘爱东; 杨海燕; 瞿丽莉; 赵婷婷
Original assignee: Xian Thermal Power Research Institute Co Ltd
Current assignee: Xian Thermal Power Research Institute Co Ltd
Priority date: 2016-06-27
Filing date: 2016-06-27
Publication date: 2016-12-07
Anticipated expiration: 2026-06-27

Abstract

The utility model discloses a kind of multichannel calibrating device for rotational speed sensor, including rotation speed standard device (2), sensor, fixture, NI capture card, PC and by school speed probe (3) are installed；Wherein, rotation speed standard device (2) is used for driving gear under test dish (1) to rotate, sensor is installed fixture and is arranged in the circumference of gear under test dish, four are uniformly arranged on sensor by school speed probe (3) circumference and install on fixture, and are connected with PC by NI capture card respectively.This utility model uses digital multimeter to be difficult to accurately measure slow-speed of revolution signal, to different rotating speeds characteristic being proposed for property algorithm, it is achieved broadband tachometric survey.This utility model, by making the work efficiency of the calibrating of speed probe, accuracy of measurement, automation equipment degree be greatly improved, has the highest economic worth and promotional value.

Description

Multichannel revolution speed transducer calibrating device

The technical field is as follows:

the utility model relates to a multichannel revolution speed sensor calibrating device is applicable to power plant's industry revolution speed sensor's accurate calibration work.

Background art:

with the acceleration of the industrial automation degree of the power plant, the application and installation amount of the rotating speed sensor increases year by year, and aiming at the measurement of the output signal of the sensor, the frequency gear of a digital multimeter is mostly adopted for measurement at present (the frequency and the rotating speed have the same dimension and are expressed as [ T ]^-1]) The digital multimeter has larger error during low-speed measurement and can not meet the requirement, the other digital frequency meter can only calibrate one sensor, the data needs manual recording, the working efficiency is low, and the data needs to be recordedThe data volume of (2) is large, the data digit is large, and errors are easy to occur during manual recording.

The utility model has the following contents:

the utility model aims at improving work efficiency and improving the measuring degree of accuracy, provide a multichannel rotational speed sensor detection device, realize the broadband rotational speed measurement that frequency counter can not realize, throw the measuring mode that traditional desk-top frequency meter is one to one, utilize virtual instrument technique can realize multichannel rotational speed sensor's measurement, practice thrift the cost, the output of simultaneous measurement result report improves work efficiency.

In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:

the calibration device of the multi-channel rotation speed sensor comprises a rotation speed standard device, a sensor mounting clamp, an NI acquisition card, a PC (personal computer) and a calibrated rotation speed sensor; wherein,

the rotation speed standard device is used for driving the gear disc to be detected to rotate, the sensor mounting clamp is arranged on the circumference of the gear disc to be detected, and the four rotation speed sensors to be corrected are uniformly arranged on the sensor mounting clamp in the circumferential direction and are respectively connected with the PC through the NI acquisition card.

The utility model discloses further improvement lies in, the rotational speed standard device includes the motor stage body, installs the motor on the motor stage body and is used for controlling its pivoted speed controller.

The utility model discloses a further improvement lies in, and sensor sectional fixture includes that ring carrier and circumference equipartition fix four anchor clamps on the ring carrier, and four are installed on the ring carrier through an anchor clamps respectively by school speed sensor.

The utility model discloses a further improvement lies in, and four anchor clamps are all fixed on the ring carrier through screw circumference equipartition, and the ring carrier passes through the fix with screw on the motor stage body.

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

1. Aiming at the calibration of the rotating speed sensor, the original calibration method for acquiring the single-channel digital multimeter and manually recording and processing data is updated into an automatic calibration means for acquiring four-channel data, processing a result by a computer and generating a report;

2. the digital multimeter is difficult to accurately measure low-rotating-speed signals, a targeted algorithm is provided for different rotating-speed characteristics, and broadband rotating-speed measurement is realized. The utility model discloses to make work efficiency, the measuring accuracy, the instrument degree of automation of revolution speed sensor's examination improve by a wide margin, have very high economic value and spreading value.

Description of the drawings:

FIG. 1 is a system block diagram of a multi-channel tachometer sensor calibration apparatus;

FIG. 2 is a schematic structural view of a sensor mounting fixture;

FIG. 3 is a block diagram of the acquisition portion of the NI acquisition card.

The specific implementation mode is as follows:

the present invention will be further described with reference to the accompanying drawings.

The utility model discloses the system block diagram is as shown in following figure 1: the device comprises 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; the rotation speed standard device 2 is used for driving the gear disc 1 to be detected to rotate, the sensor mounting fixture is arranged on the circumferential direction of the gear disc to be detected, and the four corrected 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. The rotating speed standard device 2 comprises a motor table body 202, a motor 201 installed on the motor table body 202 and a rotating speed controller used for controlling the rotation of the motor, the sensor installing clamp comprises an annular support 4 and four clamps 5 which are circumferentially and uniformly distributed and fixed on the annular support 4, and the four calibrated rotating speed sensors 3 are respectively installed on the annular support 4 through one clamp 5.

When the device works, four calibrated rotation speed sensors 3 are mounted on an annular support 4 through a clamp 5, the annular support 4 is mounted on a motor body 202, the output of the calibrated rotation speed sensors 3 is connected to an NI acquisition card, a rotation speed standard device 2 gives a standard rotation speed value, data acquisition is carried out after the rotation speed is stable, a measurement mode is selected according to the standard rotation speed value, a cycle measuring method is used at low rotation speed, a frequency measuring method is used at high rotation speed, the measurement result of the sensors is calculated, stored and displayed on a virtual panel, and the EXCEL format output report function is finished after measurement.

In fig. 1, the present invention mainly accomplishes all the designs after the rotation speed standard device, and its implementation mode is as follows:

1. design of the sensor clamp: in order to protect the motor main body, the utility model discloses increased annular support 4, by original 4 fix with screws on motor stage body 202, punch and mounting fixture 5 in two upper and lower directions of annular support 4 again, as shown in fig. 2.

2. The measurement mode is as follows: the output of the corrected rotation speed sensor 3 is connected to the input ends of the AD converter and the counter, and the acquisition part of the block diagram is shown in FIG. 3. The measurement precision in the whole rotating speed range is ensured by combining two measurement methods, namely a timing counting method (namely a frequency measurement method, the measurement error is larger at low speed) and a fixed number timing method (namely a cycle measurement method, the measurement error is larger at high speed).

The technical route of the utility model is as follows:

1. on the motor body 202, a new sensor clamp 5 is designed to meet the installation requirement of four calibrated speed sensors 3;

2. the NI acquisition card is used for completing the acquisition of the output signal of the corrected rotating speed sensor 3, and the analog signal is converted into a digital signal;

3. the NI acquisition card is communicated with an upper computer, corresponding frequency is measured by a combination method of a cycle measuring method and a frequency measuring method, and digital signals are converted into corresponding rotating speed values to finish the acquisition and display of the rotating speed signals.

Claims

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.