SU845031A1 - Article balancing device - Google Patents

Description

(54) DEVICE FOR BALANCING PRODUCTS

one

The invention relates to a balancing technique and can be used for balancing articles made in the form of rotors with vanes.

A device for balancing articles is known, comprising a base, a plate mounted elastically on it, and a vertical spindle mounted on the plate with a product fixed on it and a spindle drive made in the form of a flange electric motor 1.

The disadvantage of the device is that when balancing products, such as rotors with blades, it is uneconomical in terms of the energy consumption of the drive.

The closest to the technical essence of the invention is a device for balancing products, comprising a housing, a vertical spindle in it with a product fixed on it and an angular oscillation drive of a pinch, made in the form of an electric motor with a diode phase switching 2.

The drawback of the device is that it does not allow testing with sufficient

accuracy and reliability of rotors with blades, namely propellers, impellers of hydroturbines. For thin rotors, the shape of the blade surface substantially determines not only the mass-geometric, but also hydrodynamic characteristics.

The purpose of the invention is to improve the accuracy and reliability of the device.

The goal is achieved by the fact that it is equipped with a reservoir of liquid fixed to the housing for placement in

10 of the device and the labyrinth seal of the spindle, and the drive of the spindle angular oscillations is made in the form of a controlled electromagnetic system with a rotor connected to the spindle, and a spindle angular oscillation sensor with signal windings,

15 connected to a controlled electromagnetic sisterle.

FIG. 1 shows the proposed device, a longitudinal section; in fig. 2 shows the drive of the spindle angular oscillations and the 2JJ block of the drive control circuit.

Claims (2)

The device comprises a housing 1, a vertical spindle 2 accommodated therein with a product 3 fixed on it, supports 4-6 for mounting the spindle 2 thereto; a spindle angular oscillation drive, made in the form of a controlled electromagnetic system 7 with a rotor 8 connected to spindle 2, and a spindle angular oscillation sensor 9 with signal windings 10-13 connected to a controlled electromagnetic system 7; mounted on the housing tank 14 with liquid 15, intended for placing product 3 therein, and additional tank 16 intended for collecting leakage of fluid from tank 14, as well as a labyrinth seal 17 p pdel 2. The reservoir 14 of the device is provided with a pipeline 18, and an additional reservoir 16 with a pipeline 19, through which, respectively, filling-out and removal of the liquid are carried out. The spindle 2 of the device is provided with a deformable element 20, as well as elastic elements (not shown in the drawing), providing them with angular oscillations of the spindle. The controlled electromagnetic system 7 contains a pair of windings 21 and 22 connected in series with each other, a rheostat 23 connected to its lowest in series, and another pair of windings 24 and 25 connected in series with each other and connected to a rheostat (not indicated on drawing), and the winding 26 mounted on the rotor 8 of the system. The spindle angular oscillation sensor 9 contains a permanent magnet 27 connected to spindle 2, and each pair of windings 10, 11 and 12, 13 has a series internal connection. The control block diagram of the drive is made of polypropylene in the form of a generator 28 connected in series, a voltage amplifier 29 and a power amplifier 30 connected to the winding 26 of the rotor 8; an amplifier 31 connected in series with an input connected to a pair of windings 10 and 11 of sensor 9; rectifier filter 32 i of the neoteiometric bridge circuit 33 with engine 34; sequentially connecting 1; 1x to each other electronic automatic potentiometer 35 with an input connected to the output of a potentiometric bridge circuit 33; and a reversing motor 36 mechanically coupled to the slider 34 and the rheostat slider 23. The windings 24 and 25 of the controlled electromagnetic system 7 and the windings 12 and 13 of the sensor 9 of the spindle angular oscillations have an switching circuit (not shown in the drawing) identical to the winding switching circuit 21, 22 and iO, 11. The device is also equipped with axial force sensors 37 and 38, an imbalance sensor 39, a torque sensor (not shown in the drawing), a non-deformable element 20 installed, a brake mechanism 40, which fixes the position of the spindle with the product. The device operates as follows. On the spindle 2, fixed by the brake mechanism 40, the product 3 is mounted and secured tightly thereto. Liquid 15 in tank 14 is missing. The brake mechanism 40 is turned off and the drive of the spindle angular oscillation is turned on. During the start-up period, the windings 21, 22 and 24, 25 are energized with the highest low level voltage. This is achieved by decreasing the resistance of rheostat 23 to zero. After the product is swung up to a certain (working) amplitude, each pair of windings 10, 11 and 12, 13 of sensor 9 is induced by alternating voltages that, after conversion to direct current, set the rheostat sliders 23 to a certain position, reducing the power supplied to the electromagnets. The operating voltage from generator 28 is also supplied low, but constant in magnitude. The low voltage level of the electromagnetic drive power is due to the fact that in the absence of fluid in the tank, the product has little resistance to angular oscillations, mainly due to inertial forces. This is how the constant amplitude of the rotor oscillations is maintained when measuring mechanical unbalance. When measuring the total imbalance, when the reservoir 14 is filled with liquid, the moment of resistance of the rotor movement is variable due to the specific shape of the blade, therefore, the device providing the established auto-oscillatory mode will be required to control the drive power depending on the direction of rotor movement. In this case, the supply voltage of the electromagnetic drive, both from the generator and from a separate DC source, is supplied at a high level. Unbalanced forces caused by uneven mass distribution affect the sensor 39 through the spindle. In addition, the device measures the reactions of the product and spins in the projections on the vertical axis. Next, the reservoir 14 through the pipeline 18 is filled with liquid 15. In the same mode of angular oscillations, but with high power consumption due to hydraulic resistance, total imbalance, total vertical forces and moments are measured. The specific feature of the measurements is that in one oscillation period the dynamic characteristics are measured twice. As a result of the measurements, the computational unit (not shown in the drawing) produces - algebraic summation of the projections of imbalances and vertical forces, angles and moments, and thus gives the final information on the mechanical and hydrodynamic characteristics of the product. The device allows technically and economically obtaining complex theoretical characteristics of products, especially heavy and large ones. Under production conditions, these characteristics determine the degree of design and technological refinement, for example, the surfaces of the blades. The invention The device for balancing products, comprising a case, a vertical spindle placed in it with a product fixed on it and a drive of angular oscillations of a pinch, - that is, increase its accuracy and reliability, set-. The device is equipped with a reservoir with liquid for housing the product and a spindle labyrinth seal mounted on the housing, and the drive of the spindle angular oscillations is designed as a controlled electromagnetic system with a rotor connected to the spindle and a spindle angular vibration sensor with signal windings connected to the controlled spindle electromagnetic system. Sources of information taken into account in the examination 1. Sat. “Balancing machines and devices. Ed. V.A. Schepetilnikova. M., “Mechanical Engineering, 1965, p. 559. 2. Сб. "Theory and practice of balancing machines and devices." Ed. V.A. Schepetilnikova. M., “Mechanical Engineering, 1970, p. 93-95.