SU1427270A1 - Device for thermoelectrical check of local inhomogeneity of metals and alloys - Google Patents

Abstract

The invention relates to non-destructive testing and can be used to control local structural heterogeneity on products made of ferromagnetic materials, such as local chill on cast iron castings after various types of heat treatment. The purpose of the invention is to increase the sensitivity and performance of the control. The device contains a group of hot electrodes, a cold electrode, a clamp, a switch that alternately connects the electrodes, a dielectric sleeve and a measuring system. The cold electrode is made in the form of movable guides, one ends of which are fixed on the hinge, while others are spring-loaded and placed inside the bushings. In a dielectric bushing, grooves equal to at least half the radius of hot electrodes are symmetrically along the generatrix. The measuring system includes a pass-through electro-inductive sensor, a Thermo EMF signal converter, a unit for comparing the measured signal with a threshold one, an information processing unit, a filtering unit, a phase shifter, an amplifier, an electroinductive sensor signal converter, and a unit for displaying products. 1 hp f-ly, 1 ill. i (L 4; s 1C vj

Description

The invention relates to non-radar testing and can be used to control local structural heterogeneity on articles made of ferromagnetic materials, for example, local chill on iron castings.

The aim of the invention is to increase the sensitivity and performance of control products from fer-. magnetic materials due to the detection of products with a structure that differs in volume from the given one. The drawing shows a structural diagram of the device for controlling the local structural heterogeneity of products from ferromagnetic materials.

The device consists of a multi-electrode sensor 1, made in the form of a hollow cylinder, hot. Electrodes 2 of which have a common heater 3 and a refrigerator 4 and are located against the controlled areas on the product 5, and an electrically inductive sensor 6, rigidly connected to the sensor 1 cup 7 Between the electro-inductive sensor 6 and the glass 7 there is a gasket made of insulating material 8. In the inner part of the electro-inductive pass-through sensor 6 there is a sleeve 9 made of a dielectric, in the inner part of which Metal movable guides (cold electrode) 10, one ends of which are fixed on hinges 11, and others spring-loaded with springs 12, and grooves 13 for hot electrodes 2.

The grooves 13 have a cylindrical surface and are made on the inside. parts of the dielectric sleeve 9, and their depth is not less than half the radius of the hot electrodes 2. The product is moved and pressed by means of a movable table 14 with a platform having openings for the exit of the hot electrodes 2, current 15, spring 16, stop 17, pusher 18, the spring 19, the pusher, the latch 20 and the housing 21. The rotation of the product 5 is realized by means of the grip 22 and the rotary mechanism 23.

The measurement system consists of a switch 24, a thermopower signal converter 25, a unit for comparing the measured signal with a threshold unit 26, an information processing unit 27, a filtering unit 28, a phase shifter 29, and a gain of 0

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bodies 30, the converter 31 of the signal of the pass-through electro-inductive sensor and unit 32 of product inspection.

The device works as follows.

The heater 3 and the cooler 4 of the sensor 1 are turned on and when the operating temperature on the hot electrodes is reached, the measuring system is switched on. The controlled product 5 is installed on the surface on which the structural heterogeneity is monitored on the table 14 and, applying force along the geometric axis of the sensor, the product 5 is placed in the pass-through electro-inverse sensor 6. At the same time, the rod 15 moves and deforms the spring 16. Hot electrodes 2 of the sensor 1 passes through the openings of the platform of the table 14 and presses against the test surface of the product 5, and the cold electrode 10, which, when fully raised, table 14 was in a vertical state, points to the hinge 11 by the action of the spring 12 and comes into contact with the outer surface of the product 5. The signal from the electro-inductive sensor passes through the signal converter 31, which serves to decompose it in harmonics and balance in amplitude and phase, the filtering unit 28 that suppresses certain (not information harmonics, the phase shifter 29, which allows to establish the phase of the measured signal necessary for monitoring and the amplifier 30 and enters the information processing unit 27, through the switch 24, the thermoelectric signal converter 25 The emf and comparison unit 26 alternately receive a signal from each hot electrode of sensor 1..

In block 26, the incoming signal is compared with a certain threshold (predetermined) signal, co. corresponding to the defective product. The items are disassembled after analysis in block 27 of measurement results by an electro-inductive sensor 6 and a sensor. one,

After checking the products 5, the spring 16 returns the table 14 with the product 5 to its original position, from which it is using the gripper 22 and the rotary mechanism 23 of the interchange: it is put into a suitable or reject container indicated by the sorting unit 32.

Claims (1)

1. A device for thermoelectric monitoring of local heterogeneity of metals and alloys, containing a sensor with a group of hot electrodes made of the same material, one ends of which are enclosed in a common with a dielectric sleeve placed inside it, in which symmetrically along the generatrix there are grooves equal to at least half the radius of hot electrodes, the cold electrode is made in the form of movable guides, some of which are fixed on a hinge, and others the heater, while others share a common IQ spring and are placed inside the sleeve, Boat, cold electrode, clamp, serial switch electrodes and measuring system characterized by - with to increase sensitivity and product control performance from ferromagnetic materials, it supplied with electrical inductionI 2, the device according to claim 1, characterized in that the meter for the system further comprises 15 an electrically inductive pass signal converter, an amplifier, a filtering unit, a phase shifter and an information processing unit. 1d 20 19  -k 2ГЗ | spring and placed inside the sleeve, I 2, the device according to claim 1, characterized in that the measuring system further comprises an electrically inductive sensor signal transducer, an amplifier, a filtering unit, a phase shifter and an information processing unit. -23