DE2455670A1 - Melt sampling and testing probe - making a no. of simultaneous tests and samples at a given depth in the melt - Google Patents

Abstract

The probe and its carrier have a contact detector attached to and moving with the carrier. The end of the contact detector adjacent the probe is a predetermined distance behind the probe tip, the distance being such that when the end of the detector contacts the top surface of the melt during immersion of hte probe, the probe tip is at approx. the required dpth in the melt, and the end of the detector has appts. emitting a signal when it contacts the melt surface.

Description

Device for measurements inside a metal bath The invention relates to improvements in devices for making measurements inside a metal bath.

The effective monitoring of the progress of a metallurgical process as is well known, depends, among other things, on the knowledge of the various for the condition of the metal during treatment and during measurement these parameters of their most precise determination within the shortest possible Time off. With regard to the production of steel in particular, these are to be considered parameters to be drawn are the temperature, the composition and the oxygen activity.

In addition, it is obvious that the speed with which the results of the measurements carried out are determined is decisive for the period in which the respective metallurgical process is acted upon can to ensure the desired course.

This period not only affects the productivity of the running Process, but also the extent of the reactions.

On the other hand, there is the spread of the results of the measurements carried out itself depends on the reproducibility of the conditions under which these control measurements be made.

Until recently, pan samples were taken by a Operator, from which a probe with a sampling device into the pan was immersed.

It is obvious that this way of working is hardly possible offers, with regard to the position of the probe, the penetration depth, the immersion time etc. to ensure constant conditions at all times.

In this method, in which the human factor is of great importance What is important is that the reproducibility of the operating conditions relies too much Coincidence 90 that it is difficult to interpret the results of the measurements as well as making corrections to try to detect any difference in the to take into account the actual conditions when performing the measurements.

In order to eliminate these disadvantages, it has already been considered in the case of measurements in a steel bath located in the pan, a measuring probe to use their Electric lowering movement with constant size is controlled. It was hoped in this way the influence of the human factor to be able to switch off as much as possible.

Nevertheless, the use of this already improved device left nevertheless no operation under really identical and reproducible conditions to. Depending on whether the pan lining is new or worn and the pan filling higher or lower, the probe penetrates, the size of which is constant, more or less deeply in the bathroom. The depth of penetration of the probe into the steel bath as well as the duration of the contact of the probe with the liquid steel are thus of one Process to the other different.

The precise object of the present invention is a device by which the aforementioned disadvantages are eliminated in an effective manner can be and, accordingly, a measuring or sampling probe independently from the liquid level of the metal bath to a certain and unchangeable depth can be introduced and maintained at this depth for a certain minimum period.

The device according to the invention with a probe, with which by immersion one or more measurements or sampling in one at the same time in the bath Metal bath is essentially characterized by that they have a contact detector that is permanently connected to the probe and can be moved with it includes whose end located at the head end of the probe at a predetermined distance is offset from the head to the rear, this distance being chosen so that the Contact of the end with the bath surface turns the head of the probe almost in the desired position Depth is located in the bath, and further characterized in that this end with a Device provided - which sends a signal when connected to the Bath surface comes into contact, which makes it possible to precisely track the downward movement of the probe stop at the moment when the head of the same is at the desired depth.

The signal from the end of the contact detector can be an electrical or sound impulse, etc., but the best results with a pneumatic Impulse were achieved, since this is a particularly simple, cheap contact detector and easy-to-use and replaceable device can be used.

According to the invention, the contact detector can be a cap act from cardboard, which is on a hollow tube as an integral part of the probe carrier watch out, the burning of the pipe starts the moment it comes with the surface of the metal bath comes into contact. The ones created by this combustion Gases create a pressure in the cap and in the hollow tube, which is used to generate a To operate the membrane, the movement of which interrupts the downward movement of the probe will.

In practice this is the distance between the end of the probe and the The end of the contact detector is slightly less than the desired depth because of the dead time between the moment the contact detector sends its signal and the moment consideration must be given since the probe effectively comes to a standstill. While During this dead time, the probe goes one way down, that of the lowering speed as such is dependent. Setting the effective distance between the sunde the probe and the end of the contact detector takes into account the aforementioned Factors on a trial basis so that the head of the probe effectively at the usual depth comes to a standstill under the bathroom surface.

According to an advantageous modified embodiment of the inventive The latter device includes an automatic system with which the probe is released the desired depth, their dwell time in this depth for a certain duration and you Restarting from the bathroom can be controlled.

The following example is to be considered in a non-limiting sense offers the possibility of better understanding how a device according to the invention can be constructed. This device (Figure 1) comprises a Keß or

Sampling probe 1 at the end of a probe carrier 2. On the probe carrier 2 there is a hollow tube 3, at the lower end of which there is also a hollow cap 4 from cardboard is used. The distance 5 between the end of the probe and the The end of the cap is, as mentioned above, fixed so that the head of the probe the desired immersion depth in a largely vertical downward movement in the metal bath reached and comes to a standstill there.

The moment the probe is immersed, the end of the cap 4 hits the bath surface, generate the by the combustion the cap resulting gases create a local pressure, which is in the cap and in the Hollow tube builds up until an elastic membrane 6 is reached, which has a microswitch 7 for automatically switching off the motor 8 for moving the probe carrier 2, for example operated via a rack and pinion drive 9.

A device for controlling the downward movement and the re-upward movement the probe as well as the dwell time at a certain depth can be constructed as follows referring to FIG. 2.

With the reference number 10 are the terminals for the power supply of, for example, 220 V. The junction 11 closes one after the other a hand-operated switch 12, a button 13 for controlling the downward movement of the Probe, a contact 14 that stays open when the relay? 2 for restarting is excited, a normally closed contact 15 and a relay 16 / the in the excited state, the rotation of the motor 17 (Figure 4) in the downward movement the direction corresponding to the probe (via the three contacts 18, 19, 20) controls while at junction 21 successively the relay 22, which in the energized state the Rotation of the motor 17 in the direction corresponding to the upward movement of the probe (via contacts 23, 24, »25) controls a contact 26 as the upper limit switch Contact 27, which remains closed when relay 16 is not energized, and on Follow button 28 to manually control probe reboot.

The holding contact 29, the remains closed when the relay 22 is energized, and the timing contact 36, the one Device for the automatic control of the probe movement starts. On the Button 13 connected in parallel is the holding contact 30, which remains closed when the relay 16 is energized.

According to FIG. 3, the device comprises the automatic control probe movements, with power supply (terminals 31), a button (32) to switch off the device, the microswitch 7, (see Figure 1), which with the Diaphragm is coupled for automatic shutdown, a holding contact 33 in parallel to the microswitch 7, this holding contact being closed when the relay 34 is energized remains, contact 37 for resetting the delay to zero, the relay -34 to interrupt the downward movement of the probe and parallel to this the delay relis 35, which controls the restart of the probe.

-The operation of the device is as follows: Located at the beginning the probe is in the upper position outside the metal bath, being in the circuit 11 the switch 12 and contacts 14 and 15 are closed.

The operator presses the button 13, which the excitation circuit of relay 16 closes, whereby the following work processes are initiated: a) Closing of contact 30, which automatically supplies the circuit 11, b) opening the contact 27, which prevents the relay 22 at the same time how the relay 16 is energized, c) bottom closing of the contacts 18, 19, 20, which ensures is that the motor 17 is applied voltage and the motor is in the downward movement the direction corresponding to the probe is started.

After the lower end of the cap 4 the surface of the metal bath has reached, the membrane 6 with the pressure in the hollow tube 3 by the combustion the end of the cap 4 resulting gases loaded. Lower stress on the membrane 6 closes the micro switch 7, whereby the circuit connected to the terminals 31 an excitation of the relays 34 and 35 via the contacts closed at this moment 32 and 37 permitted. The energized relay 34 closes the contact 33 once which the supply of the relay 34 is automatically held, and opens to the other the contact 15, whereby the relay 16 is de-energized and then the movement of the motor 17 and thus the downward movement of the probe can be interrupted.

The excitation of the delay relay 35 makes it possible to conclude of the contact 36 after a certain period of time. By closing the contact 36 is the excitation circuit of the relay 22 via the contact 27 (duroh de-excitation of the Relay 16 closed) and contact 26 closed, which is only in the upper end position opens.

The excitation of the relay 22 ensures the following work processes: a) Opening of contact 14, which prevents untimely re-energizing of relay 16, b) opening the contact 37 in order to de-energize the relays 34 and 35, c) closing the contacts 23, 24, 25, whereby the motor 17 can be supplied with voltage again ,. so that it can rotate in the direction corresponding to the re-start of the probe is brought, d) closing of contact 29, which supplies the circuit 21 and accordingly the excitation of the relay 22 after reopening of the contact 36 in Connection to the de-excitation of the relay 35 holds.

The probe is started up again up to the upper end point, at which the contact 26 is opened, which in turn the relay 22 is de-energized, which then closes the contact 14 and the opening of the contacts 23, 24, 25 for Consequence. The device is thus returned to its starting position.

Patent pending .:

Claims (6)

PATENT CLAIMS: 3 device in order to use a corresponding Probe one or several measurements simultaneously by immersing it in a metal bath or to be able to take samples at a certain depth, characterized in that that the probe (1) provided with the probe carrier (2) comprises a contact detector element, which is firmly connected to the probe carrier (2) and moves with it and its end on the probe side at a certain distance from the head of the probe (1) is offset to the rear, this distance being chosen so that upon contact of the end with the bath surface during the immersion process of the probe (1) the head of the probe (1) is almost at the desired depth in the bath, and that this End of the contact detector element is provided with a device that upon contact sends a corresponding signal with the bath surface. 2. Apparatus according to claim 1, characterized in that it has a Lowering device (g, 9) comprises whose automatic shutdown of the sent Signal is dependent, being in the dead time between the moment when this signal is sent, and the moment the probe (1) comes to a standstill, the head of the Probe (1) experiences a lowering to the effectively desired depth. 3. Device according to claims 1 and 2, characterized in that that the surface detector is a detector that sends a pneumatic pulse. 4. Apparatus according to claim 3, characterized in that the end of the surface detector is formed by a tubular cap (4), which in particular on a party Pay attention to the hollow tube (3) connected to the probe carrier is, wherein the cap (4) is made of a material whose combustion immediately upon Contact with the metal bath begins, and the pneumatic pulse through the Pressure is released in the cap (4) by the resulting from the combustion Gases are produced. 5. Device according to claims 1 to 4, characterized in that that they hold the probe at the desired depth for a certain period of time Device includes 6. Device according to claims 1 to 5, characterized in that that it has the following parts: a. an electric motor (8) for the downward movement and restarting the probe (1), b. two relays (16, 22) to control the under a to set the mentioned motor (8) to rotate in one direction, c. a relay (34) for controlling the shutdown of said motor (8), d. a delay relay (35) for controlling the restarting of the probe (1), the arrangement with Connections, buttons, switches and contacts are provided in such a way that - when closing the circuit of the first relay mentioned under b, the rotary movement of the motor starts and the probe is lowered, - by the one emitted by the detector Signal the circuit of the relay listed under c closes, which on the one hand the power supply to the motor is interrupted and it is brought to a standstill and to the other the delay relay mentioned under d is energized, - after a given time by the relay listed under d the second named under b Relay restores the power supply to the motor so that it is in the can turn the direction corresponding to the re-start of the probe from the bath.