JPS62179858A - Cutting length controlling device - Google Patents

Abstract

PURPOSE:To uniformize cutting length of casting billet and to improve yield of products by arranging an arithmetic unit for cutting control means of a cutting length control device, and inputting signal from casting billet carrying speed detecting means, and under arranging a fixed cutting length setter, a carrying length setter from cutting start and a delay time setter. CONSTITUTION:The arithmetic unit is also connected with a molten metal surface controlling panel 6, which controls the molten metal surface uniformly. When carrying of the casting billet has reached to length LS deducting the constant length S from the fixed shearing length L presetted, and adjusting time t1 relating to the carrying speed V at this time is calculated through a cutting command from the cutting length control panel 13. When this adjusting time t1 passes, the cutting command is transmitted to the cutting machine 18 and after delay time t2 since reaching the command, a cutting edge 16 starts to shear the casting billet 17. The molten metal surface control panel 6 adjusts so as to keep the uniform level of the molten metal surface. In this way, a length of casting billet is controlled uniformly and the yield of the products is improved.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention is applied to steel billet cutting equipment of continuous casting equipment, etc.
The present invention relates to a cutting length control device for cutting or marking a steel billet at a constant length in equipment such as cutting where the feed speed of the steel billet fluctuates.

<Conventional technology> As a conventional example, an overview of continuous casting equipment and cutting length control are described in the second section.
In FIG.

The molten steel in the cider 01 is poured into a mold 03 via a tundish 02, where it is formed into a solidified shell and sent out as a steel billet 17, which is a material to be cut.

Here, it is extremely important to stabilize the molten steel level in the mold 03 in order to form a good solidified shell. Therefore, in order to keep the level of the hot water constant, the hot water level detector 04 detects the fluctuation of the hot water level, and the rotational speed of the pinch roller 05, that is, the feeding speed of the steel billet 17 is automatically controlled. For automatic control, the DC motor 08 is controlled by the thyristor power supply 07.

This thyristor power supply 07 is controlled by the hot water level control panel 08, and the rotation of the DC motor 08 is controlled by the tacho generator 09.
is detected and fed back to the hot water level control panel 08. In this way, the level of the molten metal is always kept constant by varying the feed rate. Although FIG. 2 shows an example of manual water level control, the feed rate also fluctuates in manual water level control.

Regarding cutting when the feed speed of the steel billet 17 fluctuates in this way, the preset feed amount, that is, the feed amount Ls at the start of control (this Ls is shorter than the predetermined cutting length described later), is set by the measuring roll. 10. Pulse generator 1
1. It is detected by the pulse counter 12, and as a result, a cutting command to open the hydraulic solenoid valve 14 is issued from the cutting length control panel 13, the cylinder 15 of the cutting machine 18 is driven, and the blade 16 cuts the steel piece 17. do.

<Problems to be Solved by the Invention> However, when cutting the steel billet 17 described above, even if a cutting command is issued based on the detection of the control start feed amount Ls, the cutter is not activated due to the activation delay time of the solenoid valve 14 or from the standby position. 1B
There is a delay time t2, such as the time required for the knife to move to the cutting start position where it contacts the steel piece 17, and cutting must be carried out taking into consideration the feed amount corresponding to this delay time t2. If the feed speed is V, then 1
=vt2, and here t2 is a constant value. However, although the predetermined cutting length can be obtained only when the feed rate V satisfies the length), the feed rate fluctuates as described above, resulting in the problem that the cut length of the steel piece 17 is not constant.

SUMMARY OF THE INVENTION In view of the above-mentioned drawbacks, it is an object of the present invention to provide a cutting length control device that controls the cutting length of a material to be cut to be constant.

Means for Solving the Problems> The present invention achieves the above-mentioned objects by: (1) a molten metal level control means provided to control the molten metal level at a constant level in continuous casting equipment; A cutting length control device consisting of a cutting length control device provided to control a cutting machine, and a cutting machine provided to cut a steel piece using the cutting length control device. In the apparatus, a calculation device provided in the cutting length control means, a steel billet feed speed detection device connected to the calculation device, a predetermined cutting length setting device for the steel billet connected to the calculation device, and a feed point for starting control. In still another invention, the invention is characterized by comprising a setting device and a delay time setting device connected to the calculation device and setting a delay time from a disconnection command to disconnection. The addition is that it is connected to a 1llll board for controlling the hot water level.

In a cutting equipment where the feed speed of the material to be cut fluctuates, when the feeding is completed by a length s, which is the predetermined cutting length minus a certain length S, the control start command will cause the current The adjustment time t, which is calculated using the feed speed V as a variable, is calculated, and cutting is started after this delay time t2, and the time from the above-mentioned control start command to the start of cutting, that is, the adjustment time t! The sum of 1. and delay time t2. The value of + 12 is multiplied by the feed speed V at the time of the control start command [V(tt + t 2
)] is equal to the above-mentioned constant length S, the adjustment time t1 is determined.

Also, the feed speed V used at the start of control and the calculation at that time.
Control '#tSl Time from start command to start of disconnection (tl+
t2) is input to the hot water level control panel so that the time feed rate of 11+12 becomes constant.

Embodiments Here, the present invention will be described in detail with reference to FIG. The same parts as in Fig. 2 are given the same reference numerals.
4 is a mold through which the steel slabs 17 are continuously sent out, and 4 is a molten steel feed rate control (molten metal surface control) river detector for stabilizing the molten steel surface in the mold 3 and forming a good solidified shell. Surface detector, '5' is a pinch roller for feeding, 6
7 is a control panel for controlling the speed of the steel plate 17, that is, the pinch roller 5, and thus the hot water level; 7 is a thyristor power supply controlled by the control @ 6; 8 is a DC motor whose speed is controlled by the thyrisk power supply 7; This is a tough generator for detecting the speed of the DC motor 8 and, in turn, the speed of the pinch roller 5. These hot water level detector 4, pinch roller 5, control panel 6. Thyristor power supply7. DC motor8. The tachogenerator 9 serves as means for feeding the steel billet 17 and controlling the hot water level.

Further, 18 is a cutting machine that swings in the direction of movement of the steel piece 17;
Reference numeral IB denotes a blade in the cutting machine IB, 15 a cylinder for moving the blade 1G, and 14 a solenoid valve that is opened to drive the cylinder 15. 10 is a measuring roll that is interposed between the cutting machine 18 and the pinch roller 5 and detects the length of the steel piece 17; 11 is a pulse generator that outputs a pulse corresponding to the feed length; 12 is this pulse generator This is a pulse counter that counts 11 pulses. These measuring rolls 5° pulse generator 1
1. The pulse counter 12 constitutes length detection means.

Reference numeral 13 denotes an arithmetic/control device, which forms the center of the cutting length control means.

Now, in this embodiment, the arithmetic unit 13 is connected not only to the solenoid valve 14 and the pulse counter 12 described above, but also to an L
a setting device 21a, an Ls setting device 21b that sets the feed amount Ls of the steel billet 17 at the time of starting control; Delay time setting device 20 for setting a delay time t2 from the cutting command after the control start command to the start of cutting
．． An A/D converter 18 that converts a feed rate analog signal from a feed rate detection means such as a tough generator 9 into a digital signal is connected to each of them. It is also connected to a control panel 6 that outputs the elapsed time.

Next, control of the cutting length will be explained.

The feeding amount of the steel billet 17 is measured by the measuring roll 10, the pulse generator 11, and the pulse counter 12, but this feeding amount is small.

When the setter 21b measures that the feed amount has reached the preset feed amount, that is, the feed amount at the time of the control start command, a control start command is output to the arithmetic and control unit 13. Arithmetic control device! 3 takes in the feed speed V at this time from the A/D converter 19, takes in L from the L setting device 21a of the predetermined cutting length, and takes in the delay time t2 from the delay time setting device 20,
Adjustment time 1. is calculated, and a disconnection command to open the hydraulic solenoid valve 14 is output t□ time after the control start command.

When this cutting command is output, the cylinder 15 is driven and the blade 16 begins to move, and there is a delay from the cutting command at t2.
The rear knife 16 comes into contact with the steel piece 17 and is in a state where it can start cutting.

In this state, the cutting a containing the cylinder 15 and the cutter IB is
18 is moved in the advancing direction of the steel piece 17 by a swing cylinder (not shown) in accordance with the feeding speed of the steel piece 17 until cutting is completed. After the cutting is completed, the solenoid valve 14 is switched by a limit switch (not shown), and the cutter 16 is returned to its original position by the return operation of the switching cylinder 15. At the same time, the cutting machine 18 itself is returned to its original position by the swing cylinder and is ready for the next cutting. In this way, a count diameter control start command for the feed amount Ls up to the start of control is output, the feed speed V at that time is obtained, an adjustment time t□ is obtained from the previous equation, and when this adjustment time elapses, a cutting command is issued to the cutting machine 18. The cutter 16 starts cutting the steel piece 17 after a delay time t2. As a result, Ls
The feed amount of time (tt+t2) becomes the predetermined cutting length.

In the above description, the feed speed V is calculated as the speed at the start of control, but in reality, even if (tl+t2) is only a short time, the speed may fluctuate. Therefore, if the feed rate V used in the calculation from the A/D converter 19 is input to the hot water level control panel 6 for the time (tr + tl) to control the pinch roller 5, the cutting length can be made more accurate.

That is, in order to keep the feed rate V constant during (tl+t2), the feed rate V used at the start of the control and the calculation at that time is input into the hot water level control panel 6 at the elapsed time of (tl+t2).

The pulse counter 12 starts counting from the start of control (
tl+t2), and the control start command is issued after the constant feed amount of L is detected, as described above.

Therefore, a specific example of each numerical value of the 0th order that needs to be reset during (tl+t2) is as follows.

Assumptions Delay time tl・2 sec Cutting length I,
= 2,000mm Feed amount at the start of control L s = 1900mm Calculation result v am/win tl
5ec1500 2.0 2000 1.0 2400 0.5 As mentioned above, since the feed rate V is kept constant during (tl+t2), it is expected that the fluid level fluctuation will increase, so the value is calculated. Based on the experience so far, the acceleration/deceleration rate α during speed fluctuation is about l ram/sec2. If (tl+
t2) = 4 sec, and the acceleration/deceleration α is l rsti
/ sec, the increase ΔS in the hot water level fluctuation is calculated as follows, but it is a value that does not pose a problem in practice.

ΔS=坏α(t'l"tl)2=坏XIX1e=8m
<Effect of the invention> A calculation device is provided in the cutting length control means of the conventional cutting length control device, and the signal from the billet feed speed detection means, the predetermined cutting length setting device, and the feed position setting from the start of cutting are provided. By providing an input device and a delay time setting device, the cutting length of the steel billet is controlled to be constant, and the yield of the product is improved.

In addition, in another invention, since the billet feed rate at the start of control fluctuates slightly until cutting, the billet feed rate at the start of control, the adjustment time and delay time until cutting are determined by the level control panel. By inputting , the billet feed rate is made constant, which further makes the cutting length constant.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an embodiment of the present invention, and FIG. 2 is a schematic diagram of a conventional example. In the figure, 4 is the hot water level detector, and 6 is the control panel. 9 is a tacho generator, 13 is an arithmetic and control device, 17 is a steel piece, 19 is an A/D converter, 20 is a t2 setting device, 21a is an L setting device, and 21b is an L8 setting device.

Claims (2)

[Claims] (1) In continuous casting equipment, there is a molten steel level control means provided to control the molten steel level at a constant level, a length detection means provided to detect the length of the billet, and a In a cutting length control device comprising a cutting length control means provided to control the cutting machine by a signal, and a cutting machine provided to cut a steel piece by the cutting length control means, the cutting length control means is provided with: a computing device connected to the computing device, a means for detecting the feed rate of a steel billet connected to the computing device;
A predetermined cutting length setting device for a steel billet and a feed amount setting device for starting control, both connected to the calculation device, and a delay time setting device connected to the calculation device to set a delay time from a cutting command to cutting. A cutting length control device characterized by: (2) A molten steel level control means provided to control the molten steel level at a constant level in continuous casting equipment, a length detection means provided to detect the length of the billet, and a In a cutting length control device comprising a cutting length control means provided to control the cutting machine by a signal, and a cutting machine provided to cut a steel piece by the cutting length control means, the cutting length control means is provided with: a computing device connected to the computing device, a means for detecting the feed rate of a steel billet connected to the computing device;
comprising a predetermined cutting length setting device for the steel billet and a feed amount setting device for starting control, both connected to the calculation device, and a delay time setting device connected to the calculation device to set a delay time from a cutting command to cutting; A cutting length control device characterized in that the arithmetic unit is connected to a hot water level control panel of the hot water level control means.