SU1743653A1 - Device for sorting ferromagnetic parts - Google Patents

Abstract

The invention relates to sorting devices, can be used for sorting ferromagnetic parts and allows for improved measurement accuracy. A device for sorting ferromagnetic parts consists of a pipeline with a magnetising and measuring coils, a magnetization unit, a measuring and converting unit, including an integrator that has an input connected to the measuring coil, and also contains a detector for detecting a change in the resistance of the magnetizing coil in the magnetizing coil, in common the point of which with this coil is connected through the differentiating chain to the input of the integrator. 1 il.

Description

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The invention relates to sorting devices and can be used for sorting ferromagnetic parts.

Devices are known for sorting parts from ferromagnetic materials according to the magnitude of the coercive force, comprising a pipeline (tray) with magnetizing, demagnetizing and measuring coils located along it, including multi-stage recording, amplifying signals and actuators, as well as a sensor representing a solenoid. installed on the pipeline.

The disadvantages of such devices are their cumbersome and complex design.

The closest in technical essence to the present invention is a device for sorting ferromagnetic parts,

containing pipeline, on which magnetizing and measuring coils are located. The measuring coil is connected to a measurement and conversion unit. The magnetizing coil is made of two sections having a different number of coils and located on both sides of the measuring coil, with one section of the magnetizing coil being connected in opposite directions, while the other section leads are connected to the corresponding terminals of the magnetizing unit. The first section of the magnetizing coil is designed to magnetize the part under investigation. The second section of the magnetizing coil is designed to compensate for the effects of electromagnetic interference from the main section of the magnetizing coil on the measuring section when the part passes through the pipeline. At the same time significant

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the role played by the mutual arrangement of the coils.

The disadvantages of the known device are the increased complexity of its design and the increased dimensions caused by the presence of an additional movable section of the magnetizing coil.

The purpose of the invention is to simplify the design and reduce the size of the device.

The goal is achieved by the fact that in a device containing a pipeline with magnetizing and measuring coils, a magnetization unit, a measuring and information converting unit, including an integrating device whose input is connected to the measuring coil, a magnetizing resistance detector for detecting a magnetizing circuit is connected to the magnetizing coil circuit the coil and the magnetizing coil through a differentiating chain connected to the input of the integrating device, as Use This Criterion integrosummator, so that integrosummatore was carried out subtraction signal received through the differentiating circuit from the signal from the measuring coil.

A comparative analysis with a known device shows that the proposed device is distinguished by the presence of an additional element — a detection detector and an additional communication circuit. containing an integrating chain connecting the integrator input to a common point of the detection detector and a magnetizing coil.

The drawing shows a block diagram of the proposed device.

The device comprises a pipe 1, on which a magnetizing coil 2 and a measuring coil 4 are located. The measuring coil is connected to the input of an integrator 6, which forms an information measuring and conversion unit 5 with an amplifier 7, measuring node 8, threshold elements 9 and actuators 10.

The magnetizing coil is connected to the magnetization unit 11 supplying it through the detector 13 for detecting the change in resistance of the magnetizing coil. The common point of the detector and the magnetizing coil through the differentiating chain 3 is connected to the input of the integrator.

The device is based on measuring the residual magnetization of parts

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correlated with the quality of their heat treatment.

Item 12, lowered into the pipeline 1, passes without stopping the magnetizing 2 and measuring 4 coil. The passage of the magnetizing coil, it is magnetized further, having fallen into the measuring coil 4, induces an impulse of EMF in it, whose amplitude is proportional to the residual magnetization of the part. In addition, part 12 induces a pulse of EMF in coil 2, which in turn causes a change in current and, therefore, a change in voltage on the detection detector. The change in current in the magnetizing coil causes an emf of mutual induction in the measuring coil 4.

The change in voltage on the detection detector 13 through the differentiating chain 3 is fed to the input of the integrator 6. The transmission coefficient of the integrator is changed by changing the emf by mutual induction of the magnetizing and measuring coils by the inputs involved,

Let the values of the signals be the same in sign, and from the measuring coil 4 the EMF pulse caused by the passage of the magnetized part 12 and mutual induction with the magnetizing coil 2 is fed to the direct input of the integrator 6. The inverse input of the integrator receives a differentiated signal from the detection detector 13 corresponding to the change current and, accordingly, the magnetic flux of the magnetizing coil 2. In the integrator 6, the signal at the inverting input is subtracted from the signal at the direct input and integrated result by time. The signal is further amplified at amplifier 7 for indication at node 8 and for controlling the threshold element 9, which, by means of actuators 10, sorts the parts into groups.

Compared with the known device, the proposed device makes it possible to eliminate the second section of the magnetizing coil, the installation of which requires special care and space. This simplifies the design of the device and reduces its size.

Claims (1)

Claims An apparatus for sorting ferromagnetic parts, comprising a pipeline with magnetizing and measuring coils, a magnetization unit, the first output connected to the first output of the magnetizing coil, an information conversion unit including an amplifier, an output connected directly to the input of the measuring node and through the threshold element to the actuator input mechanism, characterized in that, in order to improve the measurement accuracy, it further comprises serially connected to the com magnetization detector for detecting changes in the resistance of the magnetizing IIX U) / CHJQ R four L .. coils and differentiating circuit, and the information converting unit additionally contains an integrator, output connected to the amplifier input, the second output of the magnetizing coil connected to the input of the differentiating circuit, output of the transformer connected to the first input of the integrator, to the output of the measuring coil connected to the second input of the integrator. eleven S5 b 6 7