SU883698A1 - Device for sampling liquid metal - Google Patents

Description

The invention relates to metallurgy, and in particular to devices for monitoring metallurgical processes.

A device for sampling liquid metal containing a cartridge equipped with a sampling tube with a deoxidizing agent and a cutting mold with a slit fl] is known.

The disadvantage of this device is the low representativeness of the selected sample.

It is also known a device containing a housing, inside which is placed a mold made of two split halves, a mixing chamber and a water pipe connecting them. A thin metal cap is put on the lower end of the cardboard case, which protects the sampler during immersion in the bath through a layer of slag and then quickly melts when it enters the liquid metal. The sampler makes it possible to obtain samples in the form of a disk or a rod [2].

However, the oval or disk shape of the mold mold does not exclude the possibility of the formation of shells and gas bubbles in the sample during solidification of the liquid metal, which is caused by premature plugging of the slot of the mold connector with the crystallizing metal, which excludes the possibility of gases escaping from the mold cavity at the end of its filling period.

The purpose of the invention is to increase the representativeness of the sample and the reliability of the device.

This goal is achieved by the fact that in the device containing the housing, the mold, made of two halves, the mixing chamber and connecting their inlet pipe, the mold is made with a curved section in its upper part and equipped with a spring ring, while the curved section is located at an acute angle to axis of the inlet tube.

The drawing shows a device for sampling liquid metal, General view ..

The device contains a protective metal cap 1, which protects the probe from ingress of slag, a cardboard block-case 2, into which a probe is inserted, consisting of a displacement chamber 3, in the lower part of which a plug of deoxidizer metal 4 and a detachable multi-crystallizer is inserted 5, connected to the mixing chamber by a quartz inlet tube 6. The detachable halves of the trough 5 are fastened in their upper part by a spring ring 7.

The device operates as follows.

When filling the trough 5, the liquid metal jet is directed to the screen surface of the upper part of the probe trough, made in the form of a pocket (section a). Getting into this pocket-trap (section a), the metal stream partially crystallizes, and partially reflects and spreads. However, due to the bending of the upper plane of the trough, the reflected and flowing stream zo cannot get into the area b of the upper plane of the trough and block the gap on it for gas discharge. This section of the gas exit gap will be open until the end of the filling of the mold, therefore, the probability of the formation of gas and air bubbles is reduced.

c.

883698 4

According to experimental data, the use of the proposed device for sampling liquid metal can improve the quality of the $ samples taken by creating conditions for removing gases from the sampler until it is completely filled. In this regard, the reliability of selection increases from 0.95 (known designs) 10 to 0.98. Improving the reliability of selection allows you to get economic efficiency of 100.2 thousand rubles.

Claims (2)

 The invention relates to metallurgy, and specifically to devices for controlling metallurgical processes. A device for sampling a liquid metal is known, which contains a cartridge equipped with a sampling tube of a sarl oxidizer and a removable mold with a PZ slit. The drawback of the device is the low representativeness of the sampled sample. It is also known a device comprising a housing within which a mold is made of two detachable halves, a mixing chamber and a water tube connecting them. A thin metal cap is put on the lower end of the cardboard case, which protects the sampler during its immersion in a bath through a layer of slag and then quickly melts when it enters the liquid metal. The sampler makes it possible to obtain samples in the form of a disk or rod 2. However, the oval or disk shape of the mold mold does not preclude the possibility of the formation of sinks and gas bubbles in the sample during solidification of the liquid metal, which is caused by the premature clogging of the slot of the mold of the crystallizing metal which excludes the possibility of gases escaping from the cavity of the mold at the end of its filling period. The purpose of the invention is to increase the representativeness of the sample and the reliability of the device. The goal is achieved by the fact that, in a device comprising a housing, a trough made of two halves, a mixing chamber and an entrance tube connecting them, the trough is made with a curvilinear section in its upper part and provided with a spring ring, while the curvilinear section is at an acute angle to the axis of the entrance tube. The drawing shows a device for sampling a liquid metal, a general view. The device contains a protective metal cap 1, which protects the probe from slag ingress, a cardboard block-housing 2, into which a probe is inserted, consisting of a displacement chamber 3, in the bottom the parts of which are inserted a stopper made of metal of oxidizing agent C and detachable mold-mold 5 connected to the mixing chamber of a quartz entrance tube 6. The split halves of the mold 5 in their upper part are fastened with a spring ring 7. The device works as follows shimm way. When the mold 5 is filled, the liquid metal stream is directed to the screen surface of the upper part of the test sample trough, made in the form of a pocket (section a. The trap pocket falls (section a), the metal stream partially crystallizes, and is partially reflected and spreads. due to the bending of the upper plane of the trough, the reflected and flowing page cannot get to the section b of the upper plane of the trough and close the slot on it to exit the gases. This part of the slot to exit the gases will be open until the end of the trough filling, therefore the probability The reduction of gas and air bubbles decreases by t. 84 According to the experimental data, the use of the proposed device for sampling liquid metal improves the quality of the samples taken by creating conditions for removing gases from the test tube until it is completely filled. selection rate increases from 0.95 (known constructions to 0.98. Increasing the reliability of selection yields an economic efficiency of 100.2 thousand rubles. The invention The device for sampling a liquid metal, comprising a housing, a trough made of two halves, a mixing chamber and connecting an entrance tube, characterized in that, in order to increase the representativeness of the sample and the reliability of the device, the trough is made with a curved section in its upper parts and is equipped with a spring ring, while the curved section is located at an acute angle to the axis of the input tube. Sources of information taken into account in the examination 1. US patent number 3791219, cl. G 01 N 1/12, 197. 2.Leco rapid sampjing pocedure - Brit Steelmaker, 1969, Vol. 35, No. 12, p. 20.