JPS6229166B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for controlling a material to be cut in half to half the total length in equipment for cutting moving material.

In a hot rolling line for steel materials, it is preferable to charge a large material steel billet with a large cross section and a long length into the line and perform rolling. This improves rolling efficiency and productivity, improves the consumption of heavy oil in the heating furnace when heating the billet prior to rolling, and reduces scale loss in the heating furnace due to the reduction in surface area for the same weight of billet. decrease,
It is possible to obtain great effects such as an improvement in yield due to a reduction in the weight ratio of the amount of cut off of the end of the steel piece to the weight of the steel piece.
However, as the large steel billet is charged, the obtained rolled product also becomes long, which causes the inconvenience that the subsequent equipment capacity of the rolling mill, such as a cooling bed for the rolled product, is insufficient. In order to solve this problem, it is necessary to cut the intermediate rolled material to an appropriate length during rolling.

This invention has been made in view of the above points, and aims to provide a half-cutting control device that controls a material being moved in a hot rolling line, etc. to be cut in half to half its total length. be.

An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is a hot rolling line, and rolling stand 2
This equipment hot-rolls steel slabs using a to 2h and a subsequent rolling stand (not shown) to obtain steel bars and other hot-rolled materials. 3 is a crop shear provided in the middle of the hot rolling line 1. Also 4 is
A first detector consisting of an HMD (hot steel detector);
5 is a second detector also made of HMD, and the installation interval L between the first detector 4 and the second detector 5 is equal to the length of the intermediate rolled material W obtained from the largest steel billet charged into the hot rolling line 1. It is set larger than Sakai. Further, the first detector 4 is arranged on the material charging side of the crop shear 3 at a position spaced apart from the crop shear, and the second detector 5 is arranged on the material delivery side of the crop shear 3 at a position close to the crop shear. . Note that the distance between the crop shear and the second detector 5 cannot be greater than one half of the minimum length of the intermediate rolled material to be cut in half. 6 is a control device, 7 is a clock pulse generator, 8 is a 1/2 frequency divider circuit, 9
is an addition counter, and 10 is a subtraction counter. Further, 11 indicates the first detector 4 during the detection of steel material by the first detector 4.
A contact is closed by a signal from the detector, and 12 is a gate which is opened by closing this contact. Further, 13 is a contact that is closed by a signal from the second detector 5 while the second detector 5 is detecting a steel material, and 14 is a gate that opens when this contact is closed. Reference numeral 15 denotes a setting device consisting of a digital switch, which is used to set a predetermined non-cutting length so as not to cut in half short intermediate rolled material, and is used to set the weight of intermediate rolled material between the rolling stands at the longest distance on the output side of the crop shear. The setting is made using the value converted to the first detector passage time.

Reference numeral 16 denotes a comparator which compares the set value of the setter 15 and the contents of the addition counter 9, and only when the addition counter value exceeds the set value, issues a write signal Pb after the operation of the first detector 4 is completed. The contents of the addition counter 9 are written into the subtraction counter 10. Reference numeral 17 denotes a setting device consisting of a digital switch, which is used to issue a cutting command signal earlier than the point at which the center point of the intermediately rolled material W passes in front of the second detector 5. That is, the position of the crop shear 3 is shifted to the front side (material charging side) from the second detector 5, the tip of the intermediate rolled material is cut by the crop shear by a separate control device, and the cutting command signal is The correction value is set as a time value so that the intermediate rolled material is cut in half by comprehensibly correcting the delay in operation time from when it is taken out to when it is actually cut. Reference numeral 18 denotes a comparator which issues a cutting command signal to the cropshier 3 when the content of the subtraction counter 10 and the set value of the setter 17 become equal.

Note that in FIG. 2, illustrations of changes in the cross-sectional area and length of the steel billet as rolling progresses are omitted.

Next, the operation of the apparatus having the above configuration will be explained. The steel billets charged into the hot rolling line 1 are placed on the rolling stand 2a.
When the tip reaches the position of the first detector 4 (the state shown in FIG. 2a), the first detector 4 emits a detection signal, the contact 11 closes and the gate 12 opens.
The clock pulse of the clock pulse generator 7 is
The frequency is divided into 1/2 by the 1/2 frequency divider circuit 8, and the frequency is added and counted by the addition counter 9. When the intermediate rolled material W passes in front of the first detector 4 (the second
(state shown in Figure b), contact 11 is open and gate 1 is closed.
2 closes and the addition counter 9 stops adding. At the same time, the opening of the contact 11 is detected and a pulse length measurement completion signal is generated by a one shot (not shown).
Pa is given to the comparator 16, and if the intermediate rolled material length (intermediate rolled material passing time) which is the content of the addition counter 9 is greater than the uncut length determined by the setting device 15, the comparator 16 issues a write command. Since the signal Pb is generated, the contents of addition counter 9 are the same as subtraction counter 10.
written to. The intermediate rolled material W is placed on each rolling stand 2.
b to 2f, and when the tip reaches the second detector 5 (the state shown in Fig. 2c), the second detector 5 emits a detection signal, the contact 13 closes, and the gate 14 opens. , the pulses from the clock pulse generator 7 are applied to the subtraction counter 10, and subtraction counting is started. In rolling theory, the time required for one piece of material to pass through any point on the rolling line is equal, so in the subtraction counter 10, which performs subtraction using pulses with twice the frequency as in the addition counter 9, , at the moment when the center point of the intermediate rolled material passes in front of the second detector 5, the subtraction counter 10
The content of will be 0, but if the cutting command signal is issued at this point, the cutting position will be closer to the rear than the center due to the positional deviation between the crop shear and the second detector 5 as described above, so the subtraction will be counter 10
When the content becomes equal to the value set by the setting device 17, the comparator 18 issues a cutting command signal Pc, which is applied to the cropshier 3. This allows the second
As shown in Figure e, the intermediate rolled material is cut at approximately one-half of its total length. Note that the addition counter 9 and the subtraction counter 10 are reset as appropriate using the length measurement completion signal Pa or the write command signal Pb, and the above procedure is also performed for subsequent steel pieces as shown in Fig. 2 d and e. Similarly, half-cutting is performed by comparing the measured length with the uncut length, comparing with the correction setting value, etc. If the length of the intermediate rolled material is smaller than the uncut length determined by the setting device 15, the comparison device 1
6 does not issue the write command signal Pb, therefore the subtraction counter 10 also does not operate, and the cutting command signal Pc is not issued, so the intermediate rolled material is not cut in half and advances through the rolling line as it is. This prevents the occurrence of intermediate rolled material whose length is less than the maximum distance between rolling stands, and ensures smooth continuation of rolling.

Note that when the charged steel billets are all long steel billets that are longer than the above-mentioned longest distance even if the intermediate rolled material is cut in half, the comparator 16 and setting device 15
may be omitted, and the contents of the addition counter 9 may be written directly to the subtraction counter 10 using the length measurement completion signal Pa. In this case, the apparatus can be simplified.

Further, in the above embodiment, since the clock pulse of the clock pulse generator 7 is divided by the 1/2 frequency divider circuit 8, both counters 9 and 10 are used.
Since there is an exact 1:2 relationship between the frequencies of the counters 9 and 10, there is an advantage that half-cutting can be performed accurately. It's okay. Further, in the above embodiment, the second detector 5 and the crop shear 3 were installed between the same rolling stands 2f and 2g, but the second detector 5 and the crop shear 3 were installed between the rolling stands 2g and 2h, etc. A rolling stand may be interposed between them. In this case, the positional deviation between the second detector and the cropshier can also be corrected by the setting value of the setting device 17. Also, the second detector 5
may be placed on the material charging side of the crop shear 3 if it is provided close to the crop shear 3.

The device of the present invention can be applied not only to cutting steel billets in half in a hot rolling line but also to cutting devices for cutting various materials in half in the longitudinal direction.

As explained above, according to the present invention, even if the length of the material changes, the material can be automatically cut in half, and the material can be cut in half efficiently without requiring complicated operations by the operator or interruption of material movement. Moreover, it is possible to reliably cut the material in half. In addition, the material half-cutting control device according to the present invention has a simple structure, high reliability, easy maintenance, and can be manufactured at low cost.
By using a digital counter, highly accurate control can be achieved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an equipment layout diagram, FIG. 2 is an explanatory diagram of operations accompanying the progress of an intermediately rolled strip, and FIG. 3 is a block diagram of a control device. 3... Crop shear, 4... First detector, 5
...Second detector, 6...Control device, 7...Clock pulse generator, 8...1/2 frequency dividing circuit, 9...
Addition counter, 10...Subtraction counter, 12...
Gate, 14... Gate, 17... Setting device, 18
...Comparison device.

Claims (1)

[Claims] 1. A cutting machine that cuts a moving material, a first detector for detecting the material arranged at a spaced apart position on the material charging side with respect to the cutting machine, and a first detector located at a position near the cutting machine and the above-mentioned first detector. a second detector for material detection disposed at a position on the material advancing side from the position where the tip of the material reaches immediately after passing through the first detector section; a clock pulse generator;
a control device comprising a 1/2 frequency divider circuit for dividing the clock pulse of the clock pulse generator, an addition counter, a subtraction counter, and a comparison device for comparing the contents of the subtraction counter with a set value; While the detector is in operation, the output pulse of the 1/2 frequency divider circuit is applied to the addition counter, and the first
After the detector is activated, the contents of the addition counter are written to the subtraction counter, and then the clock pulses of the clock pulse generator are applied to the subtraction counter while the second detector is in operation, so that the contents of the subtraction counter match the set value. A control device for half-cutting a material, characterized in that the comparator generates a cutting command signal and sends it to the cutting machine.