JPS582380B2 - Sampling method Oyobi Souchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and apparatus for automatically measuring or sampling the temperature of a molten steel flow, such as a flow flowing from a ladle into a mold.

In the ingot making process where molten steel in a ladle is injected into a mold to produce a steel ingot, temperature measurement and sampling of the molten steel injection stream are essential tasks for quality control of steel.

In particular, the analysis values of samples sampled from the injection stream are specified in the JIS standards as representing representative analysis values of the final product steel.

Conventionally, temperature measurement or sampling of the ladle injection stream has been carried out by manually inserting a probe attached to a long-handled holder into the injection stream.

In order to solve the problems of workability and labor burden associated with manual operation, mechanization was considered, and for example,
-17142, 50-23997, 50-23
Devices described in publications such as No. 998 are known.

In all of the above-mentioned known examples, as shown in FIG. By moving the mobile cart 4 forward, sampling is performed using a sampling container 6 provided at the tip of the arm shaft 5 of the mobile cart 4.
The injection flow and the sampling container 6 are aligned using the moving cart 4.
This is based on a fixed point stopping method in which the motor is stopped using a limit switch or the like.

When sampling is performed using this fixed point stopping method, the injection flow from the ladle 2 changes due to changes in the molten steel head in the ladle 2.
Stable sampling cannot be achieved because the position of the injection flow moves back and forth, left and right, and is greatly disturbed by wear of the nozzle, stopper, etc., and conditions such as opening degree.

The three known examples mentioned above deal with this problem by providing a funnel 7 directly above the sampling container 6.

However, if the molten steel is first applied to the funnel and then put into the sampling container 6, the molten steel will be oxidized at the collision point and mixed in by the cutting of the funnel 7, which will cause the true composition value of the steel to be inaccurate. The problem is that it cannot be used as a sample.

Further, the molten steel that has scattered or flowed out may adhere to and solidify the mechanism for retracting the funnel 7 located directly above the sampling container 6, making it impossible to drive the mechanism, and discharging the sample from the container 6.

Furthermore, a common problem when measuring or sampling the temperature of an injected stream is that inserting a probe into the injected stream will disrupt the flow, worsening the working environment.

In order to prevent this, the injection flow is throttled before the probe is inserted, but the throttled injection flow has a problem in that the flow fluctuates.

The present invention provides an automated method and device for accurately inserting a probe into the molten steel flow and reliably measuring or sampling the temperature.The first invention is to automatically move the temperature measurement or sampling probe. When inserting the probe into the molten steel flow to measure or sample the temperature of the molten steel flow, the probe is moved while detecting the heat or light of the molten steel flow in an intersecting field of view from two or more different positions. A temperature measuring sampling method for a molten steel flow is characterized in that the probe is left stationary for a certain period of time when the above detections are simultaneously made, and the second invention is a temperature measurement or sampling device for a molten steel flow in which the probe is rotated, moved back and forth, and raised and lowered. at least two thermal or photodetectors that move in the same way as the probe, and are installed so that the fields of view of at least two thermal or photodetectors intersect, and the probe is installed at the intersection or a position relative to the intersection; This is a temperature measurement and sampling device for a molten steel flow, characterized in that it is provided with a control device that controls the moving mechanism based on a signal from a detector.

The method and apparatus of the present invention will be explained below based on the drawings.

FIG. 2 is a schematic diagram showing an example of the device of the present invention. In the figure, 8 is a base, and 9 is a sampling device. It has 10.

This device 9 has an elevating stand 11 within which a platform 12 is raised and lowered.

The mechanism for lifting and lowering the table 12 may be any commonly known means, and as shown in the figure, a chain 14 is moved by a lifting servo motor 13.
A mechanism in which the stand 12 follows the movement may be used, or an elevating mechanism using a screw shaft instead of the chain 14, although not shown, may be used.

Depending on the content of ingot making work, a ladle (not shown) and base 8 may be used.
If the relative position of is always constant, the above-mentioned elevating mechanism is not particularly required.

A frame 15 having a mechanism that rotates and expands and contracts is provided on the lifting platform 12.

The turning mechanism turns between the lifting stands 11 when a frame 15 placed on the lifting table 12 is rotated by a turning servo motor 16.

The frame body 15 has a telescopic mechanism built into it, and the frame body 15
An arm shaft connection fitting 17, an arm shaft 18, and a sampling container 19 are provided at the front end (on the left side in the drawing).

When the telescopic mechanism is operated, the connecting fitting 17, the arm shaft 18, and the container 19 integrally move forward and backward while the frame body 15 remains stationary.

A two-stage telescoping mechanism as shown in FIG. 3 is a preferable embodiment that allows the forward and backward response movement of the sampling container 19 to be performed quickly and accurately, has a large stroke, and is compact.

This mechanism has a screw shaft 21 between a guide rod 20
A cylindrical body 22 that engages with the screw shaft 21 is provided.

This cylindrical body 22 is fixed to a sliding body 23.

When the screw shaft 21 is rotated by the telescopic servo motor 24, the sliding body 23 moves along the guide rod 20 via the cylindrical body 22.

A piston cylinder 25 operated by fluid pressure is fixed to the sliding body 23, and a piston cylinder 25 is mounted thereon.
The arm shaft connection fitting 17 is fixed to the tip of the arm 6.

Support rods 27 are fixed to both sides of the arm shaft connection fitting 17, and the support rods 27 are slidably housed within the guide rod 20.

However, when the piston cylinder 25 is operated,
The connecting fitting 17 moves back and forth regardless of the movement of the sliding body 23.

Therefore, when the two-stage expansion and contraction mechanism is activated, the screw shaft 21, the cylinder body 22 and the piston cylinder 25
Each expansion and contraction operation of piston cylinder 2 starts at the same time.
5 ensures the stroke, and the matching of the injection flow and the sampling container 19 is performed by a telescoping servomotor 24.

Detectors 29 are provided on the arms 28 provided on the left and right sides of the arm shaft connection fitting 17.

These two detectors 29 are installed so that their fields of view intersect in front of them, and detect the left and right sides.

The telescopic servo motor 24 is controlled by signals from the left and right side detectors 29.

A front detector 30 is provided on the frame 15, and the swing servo motor 16 is controlled by a signal from this detector 30.

Further, an upper surface detector 31 is installed on the frame 15 at an upward angle θ with respect to the horizontal, and this detector 31
Place the sampling container 1 in the specified position directly under the nozzle of the ladle.
9, and the signal from this detector 31 controls the lifting servo motor 13.

Although the control device for each of the servo motors 1316.24 is not shown, each of the servo motors 13, 16.
A control device is electrically connected between 24 and each detector 29, 30.31.

In the above configuration, the position of the injection flow existing in the space is x
, y, and z coordinates, the front detector 30 detects the X-axis displacement, the left and right detectors 29 detect the y-axis displacement, and the top detector 31 detects the two-axis displacement. be.

As shown in FIG. 4, the front detector 30 and the left and right side detectors 29 are installed so that their fields of view, 29', 29'', and 30' intersect at an intersection 32, and the intersection 32 is located at the arm axis. 18 to match the position of the sampling container 19.

Further, the upper surface detector 31 is mounted so that the field of view 31' is at an angle θ from the plane so as to coincide with the lower part of the nozzle of the ladle.

The front detector 30 detects the X-axis displacement with respect to the injection flow 39, sends the detection signal to the swing motor control device, controls the swing servo motor 16, and controls the arm shaft 18.
is centered on the inlet stream 39.

In this state, the arm shaft 18 is advanced toward the injection flow 39 (y-axis displacement).

Since each side detector 29 also moves forward together with the arm shaft 18,
If the forward motion is stopped when the injection stream 39 enters the field of view, that point is the y-coordinate of the injection stream 39, and the sampling container 19 is aligned with the injection stream 39.

FIG. 4 shows the centering operation of the arm shaft 18, but in this case, strictly speaking, the injection flow 39 has a certain thickness (
If the sampling container 19 is located at the intersection 32 of the field of view, the center of the injection flow 39 will be misaligned with the intersection 32 of the field of view, as shown in the figure, and the molten steel will flow into the sampling container 19. I can't figure it out.

Therefore, it is necessary to install the sampling container 19 and the intersection 32 of the field of view with a certain distance 1 relative to each other.

In this embodiment, in the case of full-open injection, the injection flow is directed to the center position of the injection flow 39, and in the case of throttle injection in which the injection flow is divided into a plurality of lines and its position fluctuates from side to side, the injection flow of maximum thickness is Moreover, it is possible to center the sampling container 19 to the central position.

The function and circuit configuration of the front detector 30 are as follows.

That is, as shown in FIG. 5, the detector camera 33 has five detection elements on the light receiving surface 34 through the lens system: A for maximum value, BR and BL for left and right fine adjustment, and CR and CL for left and right coarse adjustment. (solar cells) are arranged.

35 is an amplifier that amplifies the detection signal from each detection element;
6a and 36b are comparison circuits that compare the detection signals of the left and right coarse adjustment detection elements CR and CL, and a comparison circuit that compares the detection signals of the left and right fine adjustment detection elements BR and BL, and 36c is a maximum value detection element A. This is a maximum value comparison circuit that determines whether the detection signal from the sensor is greater than a certain level.

37a, 37b, 37c are output circuits, and output terminal 3
A left and right coarse turn command signal appears at 8a-L and 38a-R, a left and right fine turn command signal appears at output terminals 38b-L and 38b-R, and a stop command signal appears at output terminal 38c.

If the front detector 30 is now misaligned with respect to the injection flow 39 and is located on the left side, for example, as shown in FIG.
A right turn command (coarse) appears at 8a-L, which sends a signal to the swing motor control device to drive the swing motor 16 and turn the frame 15 to the right.

When the injection flow 39 enters the BL element zone of the light receiving surface of the front detector 30, the outputs of the output terminals 38a-H disappear and the BL
>BR, so a slight right turn command signal appears at the output terminal 38b-H, causing the frame 15 to further turn to the right.

When the injection flow 39 enters the A element zone, the output terminal 38
The b-R output disappears and a stop command appears at the output terminal 38c, the turning stops and the vehicle reaches its position.

As soon as the position of the injection flow 39 changes further in this state, the output of the left/right adjustment detection element becomes unbalanced, and a control signal is input to the swing motor control device to drive the swing motor 16 to constantly perform centering.

Next, the operation of this embodiment will be explained.

First, as shown in FIG. 2, the sampling device 9 is set in a position facing the injection stream to be sampled.

When the sampling preparation command button is pressed first, the frame 15 is forcibly rotated to the left or right, the frame 15 is roughly centered on the injection flow, and the elevating motor 13
The frame body 15 is raised until the upper surface detector 31 stops operating, and positioning in the height direction is performed.

Note that this positioning in the height direction may be determined by presetting since the height of the mold is known in advance.

In this state, the injection flow 39 is within the detection range of the front detector 30, so the servo system is in the ON state.
It's centered.

When sampling is to be performed, a sampling command is issued, and the two-stage telescoping mechanism built into the frame 15 simultaneously starts operating to move the sampling container 19 forward.

In this case, the piston cylinder 25 operated by fluid pressure takes less than a few seconds to drive the entire stroke, whereas the screw shaft 21 is driven by the telescopic motor 12, which takes some time. The operation of the piston cylinder 25 is completed quickly.

Therefore, controlling the position of the sampling container 19 with respect to the injection flow 39 by only controlling the telescoping servo motor 24 is sufficient.

Therefore, as the sample container 19 moves forward, the left and right side detectors 29 also move forward, so that the injection flow 39 enters the field of view of the left and right side detectors 29 as described above.
9 operates, the forward movement is stopped and sampling is performed.

After sampling, the sample container 19 is moved back in response to a signal from a timer or sample weight detector (not shown) to complete the sampling.

In the above embodiment, as a method of positioning the sample container, an example was described in which the front detector 30 is used to constantly center the sample container, and the two left and right side detectors 29 simultaneously detect the injection flow and control the stop. As shown, there is a method using a front detector 30 and one side detector 29, and a seventh method using a front detector 30 and one side detector 29.
As shown in the figure, a method may be adopted in which the front detector 30 is not provided and only the two left and right side detectors 29 are used.

In the case of Fig. 7, the injection stream is advanced until it hits the field of view of the side detector, and when the injection stream hits the field of view of the detector, it is rotated so that it enters between the fields of view of the two detectors, and it reaches the intersection point 32. The positioned sampling container 19 is converged into the injection stream.

Although the above explanation has been about sampling using the sampling container 19, if the probe attached to the arm shaft 18 is a bin sampler, it is possible to perform ramp ringing with the bin sampler, and if it is a temperature measuring probe, it is possible to measure the temperature. is clear.

As explained above, according to the apparatus of the present invention, it is possible to automate the sampling of the ladle injection flow or the temperature measurement work without impairing the original purpose of sampling or temperature measurement.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram of a conventional fixed point stopping type sampling device, Fig. 2 is a schematic explanatory diagram of an example of the device of the present invention, and Fig. 3 is a schematic explanatory diagram of an example of the device of the present invention.
The figure is an explanatory diagram of the two-stage expansion and contraction mechanism built into the frame body, Fig. 4 is an explanatory diagram of the relationship between the injection flow and the field of view of each detector, Fig. 5 is an explanatory diagram of the function of the front detector, and Fig. 6 and FIG. 7 are explanatory diagrams of other examples of the injection flow detection aspect of the method of the present invention. In the figure, 1 is an injection stand, 2 is a ladle, 3 is a mold, 4 is a moving cart, 5 is an arm shaft, 6 is a sampling container, 7 is a funnel, 8 is a base, 9 is a sampling device, 10 is a wheel, 1
1 is a lifting stand, 12 is a lifting table, 13 is a servo motor for lifting, 14 is a chain, 15 is a frame, 16 is a servo motor for rotation, 17 is an arm shaft connection metal 418, arm holder 19 is a sampling container, 20 is a Guide rod, 21 is a screw shaft, 22 is a cylindrical body, 23 is a sliding body, 24 is a telescopic servo motor, 25 is a piston cylinder, 2
6 is a piston rod, 27 is a support rod, 28 is an arm, 29
are left and right side detectors, 30 is a front detector, 31 is a top detector, 32 is an intersection of visual fields, 33 is a detector camera, 34 is a light receiving surface, 35 is an amplifier, 36 is a comparison circuit, 37 is an output circuit, 38 is the output terminal, and 39 is the injection flow.

Claims (1)

[Claims] 1. When a temperature measuring or sampling probe is automatically moved and inserted into a molten steel flow to measure or sample the temperature of the molten steel, the temperature measuring or sampling probe is automatically moved and intersected from two or more different positions in cooperation with the probe. Temperature measurement and sampling of the molten steel flow, characterized in that the probe is moved while detecting the heat or light of the molten steel flow in a field of view, and when the molten steel flow is simultaneously detected at two or more points, the probe is left in place for a certain period of time. Method. 2. In a temperature measurement or sampling device for molten steel flow, a movement mechanism is provided to rotate, move back and forth, and raise and lower the probe, and at least two thermal or photodetectors that move in the same manner as the probe are installed so that their fields of view intersect, A temperature measurement/sampling device for a molten steel flow, characterized in that the probe is installed at the intersection point or a position relative to the intersection point, and a control device is provided for controlling the moving mechanism based on a signal from the detector.