RU50012U1 - DEVICE FOR CONTROL OF MECHANICAL VIBRATOR - Google Patents

Abstract

The invention relates to the field of testing equipment, in particular, to devices for controlling a mechanical vibrator for fatigue tests and others.

In the device for controlling a mechanical vibrator, comprising a three-phase tachogenerator connected to the vibrator drive shaft, a rotational speed indicator connected to it through a rectifier, and a vibrator over speed control circuit connected to the tachogenerator, containing a threshold element and actuators for emergency automatic shutdown of the vibrator, and a circuit control and management of the number of cycles of the vibrator, including a pulse shaper, a frequency divider, an installation device one frequency value and a pulse counter connected to the outputs of the frequency divider, and a pulse-counting programmer, which is part of the control system, actuators for emergency automatic shutdown of the vibrator and the pulse shaper are connected to the data input-output unit, which is connected to the system for generating the next voltage value on a laboratory sample consisting of a clock generator connected to a central processor unit, which in turn is connected via an address bus to an address selector s, random access memory and read only memory, and via a data bus with random access memory and read only memory, the address selector being connected to random access memory and read only memory.

The technical result of using the utility model is to reduce the test time required to build the fatigue curve by providing the possibility of using forecast methods and the obtained test results and issuing to the user the next (recommended) voltage value on the test sample.

Description

The utility model relates to the field of testing equipment, in particular, to devices for controlling a mechanical vibrator for fatigue, vibration resistance and others.

Closest to the claimed technical essence and the achieved result, selected as a prototype, is a device for monitoring and controlling a mechanical vibrator, protected by A.S. USSR No. 721804, Cl. G 05 D 19/02, 06 V 1/10, G 01 M 7/00, publ. 03/15/75 g.

In a known device for monitoring and controlling a mechanical vibrator comprising a three-phase tachogenerator connected to a vibrator drive shaft, a rotational speed indicator connected to it through a rectifier, an overspeed drive control circuit connected to the tachogenerator and a vibrator control and monitoring circuit for controlling the number of vibrator cycles including a frequency divider and a pulse counter and pulse-counting programmer connected to its outputs, a monitoring and control circuit for the number of cycles connected to the tahog so that the rotation speed indicator is connected to the first and second phases of the tachogenerator, and the overspeed drive control circuit of the vibrator and the monitoring and control circuit for the number of cycles are connected to the first or second and third phases.

A disadvantage of the known device is the long duration of the tests necessary to build the fatigue curve of the tested materials.

The problem solved by the proposed device is the creation of an automated system for controlling a mechanical vibrator during fatigue tests, vibration resistance.

The technical result of using the utility model is to reduce the test time required to build the fatigue curve by providing the possibility of using forecast methods and the obtained test results and issuing to the user the next (recommended) voltage value on the test sample.

This result is achieved in that in a device for controlling a mechanical vibrator comprising a three-phase tachogenerator connected to a vibrator drive shaft, a rotation speed indicator connected to it through a rectifier, and a vibrator drive control circuit connected to the tachogenerator

speeding, containing a threshold element and actuators for emergency automatic shutdown of the vibrator, and a control circuit for controlling the number of cycles of the vibrator, including a pulse former, frequency divider, a device for setting the initial frequency value and a pulse counter and pulse counter connected to the outputs of the frequency divider the programmer, which is part of the control system, the executive bodies for emergency automatic shutdown of the vibrator and the pulse shaper s with a data input-output unit, which is connected to a system for generating the next voltage value on a laboratory sample, consisting of a clock generator connected to a central processor unit, which in turn is connected via an address bus with an address selector, random access memory and read-only memory, and on a data bus with random access memory and read only memory, while the address selector is connected to random access memory and read only commemorative device.

In FIG. shows a diagram of a device for controlling a mechanical vibrator, containing:

1 - three-phase tachogenerator;

2 - vibrator;

3 - rotation speed indicator;

4 - rectifier;

5 - threshold element;

6 - executive bodies for emergency automatic shutdown of the vibrator;

7 - pulse shaper;

8 - frequency divider;

9 - a device for setting the initial frequency value;

10 - pulse counter;

11 - pulse-counting programmer;

12 - vibrator control system;

13 - block input-output data;

14 - a sync generator;

15 is a block of a central processor;

16 - address selector;

17 - random access memory;

18 - read-only memory;

19 is a system for generating the next voltage value on a laboratory sample.

A device for controlling a mechanical vibrator contains a three-phase tachogenerator 1, mechanically connected to the drive axis of the controlled vibrator 2, a speed indicator 3, connected to phases A and B of the tachogenerator 1 through a rectifier 4 and connected to the phases B and B of the tachogenerator 1 of the control circuit of the vibrator 2 drive in excess speed and control and control the number of cycles of the vibrator 2. The control circuit of the drive of the vibrator 2 for speeding contains a threshold element 5 for generating a control signal with invalid tkloneniyah predetermined speed by actuators 6, and for emergency automatic shutdown of the vibrator 2, signaling and switching its mode of operation.

The control and management circuit for the number of cycles of the vibrator includes a pulse shaper 7 connected to phases A and B of the tachogenerator 1, a frequency divider 8 with a device 9 for setting the initial frequency value, and a pulse counter 10 and a pulse-counting programmer 11 connected to the outputs of the frequency divider 8, which is part of the control system 12 connected to the vibrator 2. The pulse-counting programmer 11 is connected to the threshold element 5. The control system 12 of the vibrator 2 is connected to the actuators 6.

Executive bodies 6 for emergency automatic shutdown of the vibrator 2, signaling and switching of its operation and control mode and pulse shaper 7 are connected to the data input-output unit 13, which is connected to the system 19 for generating the next voltage value on the laboratory sample. The system 19 for generating the next voltage value on the laboratory sample consists of a clock 14 connected to the central processor unit 15, which in turn is connected via an address bus with an address selector 16, random access memory 17 and read-only memory 18, and via the data bus with online storage device 17 and read only memory 18.

The address selector 16 is connected to random access memory 17 and read only memory 18.

The device operates as follows.

The principle of operation is based on a comparison in the system 19 of user-entered data for testing laboratory samples: two stress values and the corresponding values of the number of loading cycles at which the samples were destroyed (four numbers) and the results of previously performed forecasts stored in a permanent memory 18. Forecast results contain values

voltages obtained by various forecasting methods. Data entry into the read-only memory device 18 is carried out using the data input-output unit 13.

Using this device allows you to record the test results of two samples in the form of four numbers corresponding to two levels of applied load and the number of cycles to failure of the samples obtained at these voltage levels. The voltage levels are set by the user using the control system 12 of the vibrator 2. Information about the destruction of the sample in the form of the number of loading cycles is taken from the pulse shaper 7 by a signal from the executive bodies 6 about the emergency shutdown of the system. The information data input / output unit 13 transmits data via the address bus and data bus to the central processor unit 15 according to clock cycles of the clock 14. Address selector 16 selects a string of values stored in the read-only memory 18 and transfers it to the central processor unit 15 for comparison with the data taken from random access memory 17, which were entered into it using the data input-output unit 13.

The threshold element 5 generates a control signal for unacceptable deviations of the rotational speed of the three-phase tachogenerator 1, measured by the rotational speed indicator 3, from the set one and transfers them to the actuators 6 for emergency automatic shutdown of the vibrator 2, signaling and switching its operation mode using the vibrator control system 12.

The implementation of the elements that make up the system.

A microammeter equipped with a switch of measurement ranges was used as a speed indicator 3. The pulse shaper 7 is made in the form of an asymmetric trigger with emitter coupling on transistors. The frequency divider 8 is a four-digit trigger counter with feedback from the third trigger to the first and second, and each of the bits of the counter is a static trigger on transistors with automatic bias. The feedback element is an amplifier on a transistor. A device 9 for setting the initial frequency value is assembled on a transistor and a capacitor.

The threshold element 5 is assembled on a transistor, a variable resistor is used as an organ for adjusting the response level.

The data input-output unit 13 can be implemented based on the PIC16F84A microcontroller. The sync generator 14 can be implemented based on the KR580GF24 chip. The central processing unit 15 may be implemented based on

microchips KR580VM80A, KR580IR82, KR580IK38. The address selector 16 can be implemented based on the K155ID3 chip, random access memory 17 can be implemented based on the KP541RU2 chip, read only memory 18 can be implemented based on the 27C512 chip.

As a three-phase tachogenerator, a tachogenerator, for example, TMG-30P brand, can be used; vibrator - for example, brand IV-102; pulse shaper - for example, brand РП 21 М-003; pulse-counting programmer - for example, PIC 16 × 84; vibrator control systems, for example, of the VE-416 brand.

Thus, the proposed device in comparison with the prototype allows you to reduce the time required to build the fatigue curve due to the formation and issuance to the user of the next (recommended) voltage value on the test sample, taking into account the forecasting results and previously obtained results of fatigue tests. The proposed device allows you to sample large amounts of data through the use of a low-bit microprocessor and increase the accuracy of the calculation through the use of read-only memory. The transition from calculating the next voltage value inside the system of forming the next voltage level to an external account increases the versatility of the system, its independence from the used forecasting method.

Claims (1)

A device for controlling a mechanical vibrator, comprising a three-phase tachogenerator connected to the vibrator drive shaft, a rotational speed indicator connected to it through a rectifier, a speeding vibrator drive control circuit connected to the tachogenerator, containing a threshold element and actuators for emergency automatic shutdown of the vibrator, and a control circuit and control the number of cycles of the vibrator, including a pulse shaper, a frequency divider, a device for setting the outcome frequency value and connected to the outputs of the frequency divider, a pulse counter and pulse-counting programmer, which is part of the control system, characterized in that the actuators for emergency automatic shutdown of the vibrator and the pulse shaper are connected to the data input-output unit, which is connected to the formation system the next voltage value on the laboratory sample, consisting of a clock generator connected to the central processor unit, which in turn is connected via the address bus a selector address, a random access memory and read-only memory and the data bus to a random access memory and read-only memory, the address selector coupled to a random access memory and read only memory.