Bench for testing shaft for twisting

IPC classes for russian patent Bench for testing shaft for twisting (RU 2247348):

G01N3/32 - by applying repeated or pulsating forces (generation of such forces in general, see the relevant classes or subclasses, e.g. B06, G10)

G01M13/02 - Testing of gearing or of transmission mechanisms (measuring efficiency G01L)

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FIELD: testing engineering.

SUBSTANCE: bench comprises asynchronous electric motor and balancing machine interconnected through the shaft to be tested, control unit, and resonance pickup mounted on the shaft and connected with the input of the control unit. The bench is provided with the frequency converter, DAC unit, thyristor controller of voltage, and inverter. The first output of the control unit is connected with the frequency converter connected to the circuit for power supply to the asynchronous motor. The second output of the control unit is connected in series with the DAC unit and thyristor voltage controller connected with the exciting winding of the balancing machine. The circuit of the armature of the balancing machine is connected to the inverter.

EFFECT: enhanced reliability of testing.

1 dwg

The invention relates to test equipment, namely, devices for fatigue testing in torsion of shafts, primarily crankshafts.

A known device for testing crankshaft fatigue [1]. The stand consists of the PM mass, which set forth the test shaft. The loading shaft is non-directional vibrators located at the ends of the primaries of the masses. Vibrators are in antiphase. The magnitude of loading is determined by the sensor. The regulation of its value is determined by the drive motor.

The disadvantage of the stand is the impossibility of loading of the test shaft torsion.

The closest technical solution to the claimed is a stand with a closed electrical circuit for testing gears [2]. The stand contains two kinematically connected through the subjects of the transmission DC machine, enabled by the counter-parallel scheme and with each regulating rheostat in the field circuit. To create alternating cyclic load stand is equipped with a circular rheostat driven by an adjustable motor included in the excitation circuit DC machines.

Character created by stand alternating cyclic load is close to sinusoidal and constant in time, significantly differing from the viewers is imago in operation. This reduces the reliability of the test results.

Thus, the disadvantage of this stand is the inability approximation of test conditions for performance.

The aim of the invention is the approximation of test conditions for performance.

To achieve this goal resonant stand contains an asynchronous motor and balance the car, connect the test shaft, a control unit and a resonant sensor, mounted on the test shaft and enabled on the input of the control unit.

A new resonance in the stand is the supply frequency Converter, digital to analog device, the thyristor voltage regulator and inverter. One output of the control unit is connected to the frequency Converter included in the power supply circuit of an induction motor. Another output of the control unit sequentially connected to the analog device and the thyristor voltage regulator. Centerpoint machine excitation winding is connected to a thyristor voltage regulator, and a chain anchors on the inverter.

The drawing shows a schematic diagram.

Resonant stand contains asynchronous motor 1 and the balance machine 2 separate excitation, the shafts of which are connected subjects crank shaft 3 mounted in the bearings 4, the block of the control 5 and the resonant sensor 6, posted by tested on the crankshaft 3 and included in the control unit 5.

The stand is equipped with a frequency Converter 7, analog device 8, the thyristor voltage regulator 9 and an inverter 10.

The frequency Converter 7 is connected with one output of the control unit 5 and is included in the power supply circuit of the induction motor 1.

Analog device 8 is designed to change test conditions, and their approach to performance.

Thyristor voltage regulator 9 is connected to the excitation winding of the parallel beam machine 2 and controls the magnitude of the excitation current in the winding.

Analog device 8 and thyristor voltage regulator 9 is connected in series with the second output control unit 5.

The inverter 10 in the circuit of the armature balancing machine 2, Recuperat energy in the external three-phase network.

The stand can be used the following well-known technical elements: control unit - integrated thyristor device type KTU 230/RR (230 V, 50 kW); the frequency Converter thyristor frequency Converter type TFC-15 (15 kVA); analog device type CPU (the number of digits 12, 5 V supply); thyristor voltage regulator pulse - type RIT-2-150-40/U; inverter type thyristor-15 (15 kVA).

The stand works trace the accordingly.

Asynchronous motor 1 is included in the power circuit and the frequency Converter 7 create on its shaft load torque, which is transmitted to the subject the crankshaft 3. The frequency and amplitude of the ripple torque is set by the control unit 5. Simultaneously, the shaft 3 load brake torque included balancing machine 2. The degree of loading of the crankshaft 3 is determined by the value of the braking torque on the shaft of the balancing machine 2, which depends on the current flowing through the excitation winding. The magnitude of the excitation current is regulated by a thyristor voltage regulator 9. Balancing machine 2 running the generator is loaded to the inverter 10, which regulates the energy in three-phase network.

Gradually increasing the frequency Converter 7 power the electric motor 1, create the control unit 5 test conditions of the crankshaft 3 in the resonant mode.

For this purpose, the signal of the resonant sensor frequency 6 fixed on the shaft 3, by the control unit 5 compares the value with the previous signal. If an incoming signal is greater than the previous one, the control unit 5 increases through the transducer 7 frequency power of motor 1 (and Vice versa). The frequency of pulsation load torque increases and approaches the resonance.

To achieve load character epithema the shaft 3 torque close to operational, prior to testing in analog device 8 enter the characteristics of the most commonly encountered in the operation of loading conditions of the test of the crankshaft. Signal analog devices 8 thyristor voltage controller 9 changes the amount of current flowing through the excitation winding 11 Centerpoint machine 2. When the magnitude of the current in the excitation winding 11 of the braking torque on the shaft of the balancing machine 2 increases. Decreasing the amount passing through the excitation winding 11 of the current leads to a decrease of the braking torque on the shaft of the balancing machine 2. Thus, the action of the thyristor voltage regulator 9 provides for the imposition of an additional component of the braking torque balancer machine on the main loading generated electromagnetic torque of the induction motor 1. This allows you to get tested on the crankshaft 3 load torque, similar to those of the operation.

Techno-economic advantages of the invention in comparison with the prototype to include in the booth diagram of the frequency Converter, digital-analog devices, thyristor voltage regulator and inverter with appropriate connection with control unit, motor, Balan the IRNA machines and each other.

This provides an approximation of the test conditions to those observed in operation that increases the reliability of the tests.

In addition, a portion on the drive stand energy is recovered through the inverter in a three-phase electrical network, which increases the efficiency of the stand.

References

1. The magazine "Motortechnische Zeitschrift", № 37, 1976, № 5, s-207.

2. As the USSR №291122, G 01 M 13/02, 1969.

Resonance test stand shafts in torsion, containing an asynchronous motor and balance the car, connect the test shaft, a control unit and a resonant sensor, mounted on the test shaft and enabled on the input of the control unit, wherein, with the aim of bringing the test conditions for performance, the stand is equipped with a frequency Converter, digital to analog device, the thyristor voltage regulator and inverter, with one output control unit connected to the frequency Converter included in the power circuit of an induction motor, and the other output of the control unit sequentially connected to the analog device and the thyristor voltage regulator that is connected to the winding the excitation beam machine and the circuit of the armature balancing machine is enabled on the inverter.