RU13505U1 - DYNAMIC WAVE METER - Google Patents

Description

DYNAMIC WAVE METER

The technical solution relates to the bearing industry and can be used mainly to control finished products in order to determine the quality of production of the analysis of the measured characteristics.

A known method and apparatus for evaluating the imperfect geometry of the surface of the rings or balls by analysis of vibration signals (see. Journal of Design and Engineering, 1987, No. 1, pp. 140-149). The method is based on the analysis of a short vibrational signal excited when balls with defects meet on a rotating ring or a rotating ring with balls defects in an assembled bearing. The device comprises a device that reproduces vibrational signals, a high-pass filter, a digital tape recorder, a sensor, a speaker, a low-pass filter, an amplifier, an analog-to-digital converter, and a computer.

This known method for evaluating the imperfection of the geometry of the surface of the rings and balls of bearings and a device for implementing the method make it possible to determine the degree of discrepancy between the measured dimensions of the bearing parts and their reference threshold values.

The disadvantages of this known method and device are the low technological capabilities in the diagnosis of bearings, the low accuracy of the microgeometry assessment of the surfaces of rings and balls, as well as the low productivity of the control process, since the probe can be checked only after disassembling the bearing.

MKPO01M13 / 04

There is also known a method of comprehensive vibration diagnostics of rolling bearings and a device for its implementation (see RF patent No. 2104510, class. MKP Ko G 01 M 13 / 04.1997), which are taken as a prototype. The method consists in measuring the vibration signal of the bearing while rotating it under load, which is then sampled, converted to digital form and entered into the working buffer in different modes. In each of the modes, the vibration signal is subjected to a fast Fourier transform and the individual rotor speeds of the rotor, the cage with balls relative to the outer and inner rings, the ball around its own axis and the peak frequency are determined. The state of the bearing elements is judged by comparing the received vibration signals with the standard data stored in the computer memory.

A device for implementing this method comprises a vibration transducer, an amplifier-corrector, high and low frequency filters, an analog-to-digital converter, a fast Fourier converter, a determinant of frequency and rotation periods, a peak frequency counter, and also a computer with a display and a printing device.

However, the known method and device does not allow to detect defects such as waviness and non-circularity on the controlled surface of the balls.

The task is to expand the range of controlled types of defects, to offer a device that is simple and reliable in design, providing high-quality diagnostics of balls and ease of maintenance.

The device for diagnosing ball bearings is a hardware-software complex called a dynamic wave meter, which contains a mechanical unit for fixing and securing the process of driving the measured ball into rotation, devices for clamping the sensor to the surfaces of the ball, matching signal amplifier of the sensor, programmable amplifier, low-pass filter, installed in the crate. The crate is electrically connected to the analog information input-output board (analog-to-digital converter of the ADC) installed in the case of a personal computer with threshold signal values stored in the memory, which is equipped with software controls, as well as a monitor, keyboard and printing device.

The essence of the device is illustrated in the drawing, which shows its circuit diagram.

The hardware-software complex - a dynamic wavemeter - contains a mechanical assembly, including a drive unit 1 for rotating the measured ball (III), a clamping device 2 and a sensor holder 3 with a sensor 4, which is electrically connected to a matching amplifier 5, and through it to a programmable amplifier 7 and a low-pass filter 8. A programmable amplifier 7 and a low-pass filter 8 are installed in crate 6, which is connected to the analog information input / output board 9 installed in the case of a personal computer 10. The computer go as a monitor 11, a keyboard 12 and 13. Work mysch complex is carried out under the supervision of the program setpoint ACT / LW.

The device operates as follows.

The controlled ball (W) is installed in the clamps 2 of the drive unit 1, which drives it. The sensor holder 3 presses the probe of the vibration sensor 4 to the surface of the ball. When a vibration signal arrives at the matching amplifier 5, and then at the programmable amplifier 7, the optimal gain is automatically set. The signals of the vibration sensor 4 after converting them to digital form are recorded in the memory buffer of the computer 10. Then, the signal is subjected to integration, Fourier transforms and averaging. Thus, two amplitude spectra appear. 3

corresponding to deviation from roundness and speed of deviation from roundness. With all the complexity and the large amount of processing the incoming information for the operator, the process of measurement is very simple. All the necessary hints are displayed on the screen. The operator only needs, following them, to put the ball on the installation, enter its number, and at the end of the measurement process, remove it. In the process, the computer also reports on what stage of processing the program is currently occupied.

The processing results can be presented in various forms. In FIG. 2 shows a round diagram of the speed of deviation from roundness.

In addition, one can present a round diagram of deviations from roundness and corresponding spectra, both in the form of graphs (see Fig. 2) and in the form of tables. They feature harmonics up to two hundred. Accuracy and sensitivity threshold for bias is 10 μm, and for speed - 1 μm / s.

The technical result of the proposed device for the diagnosis of ball bearings is to create a device - a dynamic wavemeter, which is a software and hardware complex for determining the accuracy of the manufacture of balls in dynamic mode, which has wide versatility, high accuracy and ease of technological control operations.

Authors:

L.V. Chernevsky Varlamov

Applicant: Deputy General, Director of JSC VNIP Izamutdinov

Claims (1)

The hardware-software complex for determining the accuracy of the production of balls in dynamic mode (dynamic wave meter) contains a mechanical assembly consisting of a drive unit for rotating the measured ball, a signal converter, an amplifier, a frequency filter, an analog-to-digital converter (ADC), a fast Fourier converter, and a determinant frequency and computer with stored in the threshold signal values, as well as a monitor, keyboard and printing device, characterized in that the mechanical unit is additionally It holds a clamp device and a sensor holder with a sensor for contacts with the controlled surface of the product, the sensor is electrically connected to a matching amplifier, and through it to a programmable amplifier and a low-pass filter, while a programmable amplifier and a low-pass filter are installed on a crate that is connected to the ADC made in the form of an input-output board of analog information installed in the case of a personal computer, which is also equipped with software control.