JPS60196223A - Detector of hot rolling material - Google Patents

Abstract

PURPOSE:To provide a titled device which can be installed even in an extremely small occupying area in adverse environment by ejecting fluid, detecting the presence or absence of a rolling material in a fluid pressure detecting part, conducting the fluid pressure to an optional place apart from the detecting point, converting the same to a signal and delivering the signal for the presence or absence of the rolling material. CONSTITUTION:An ejection nozzle 21 for fluid and a fluid pressure detecting part 22 for detecting the pressure of the fluid ejected from the nozzle 21 are disposed in relative positions with the passage for a rolling material 5 in-between. A piston 43 in a cylinder 42 is actuated rightward to pressurize oil 44 upon contact of the ejected fluid with the receiving plate 41 of the part 22. The generated pressure is transmitted by a pressure conduit 45 to a cylinder 49 so that a detection signal 13 is transmitted via a pressure detecting part 47 and a detection signal transmission part 48. If the material 5 exists between the nozzle 21 and the part 22, the ejected fluid is blocked by said material and does not arrive at the part 22. There is thus no output of the signal 13 in the part 22.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a detector for rolled material in hot rolling equipment.

[Background of the invention]

Conventionally, a detector for hot rolled material (hereinafter referred to as rolled material) has the following characteristics: (2) Method of measuring the length using a pulse counter installed in the rolling equipment and predicting the position (3) Method of measuring the change in the load current of the II motor There are methods to determine the presence or absence of rolled material.

However, the HMD in (1) is heat resistant to the radiant heat from the rolled material, which is about 800 to 1500 degrees Celsius (requires water cooling).
There is a limit to miniaturization from the viewpoint of vibration resistance against rolling equipment vibrations of 5 to 50 G and Wf shock, and installation on the rolling equipment itself is impossible, and the location for installing the detector is limited. , it is impossible to detect at the location where you really want to detect.

In addition, even if it is installed forcibly, in hot rolling equipment, descaling water, equipment cooling water, etc. are poured onto the rolled material, so the intense steam and scale of the rolled material can cause serious malfunctions, and the above-mentioned environment This has the disadvantage that the lifetime of the detector is extremely short.

In method (2), the accuracy decreases due to cumulative differences due to slippage between the rolling equipment and the rolled material, elongation of the rolled material by the rolling mill, etc., and furthermore, the count start signal is
Alternatively, since it relies on the method (3), there is a drawback that the length measurement accuracy decreases.

In addition, in method (3), it is difficult to distinguish between changes in load current for rolling material to be processed by the rolling equipment and changes in load current for accelerating/decelerating the operating speed. There is also a load current change due to non-uniformity of the material and shape of the material, and there is a drawback that reliability cannot be obtained in determining the presence or absence of rolled material.

Conventionally, it has been difficult to accurately determine the timing when the material to be wound reaches the mandrel due to erroneous detection and cumulative errors.Therefore, it is desirable to switch from automatic speed control to automatic tension control for mandrel drive. If the switching occurs too early and the winding standby speed increases too much, it becomes impossible to wind the material to be wound, the rolled material scatters around the DC, and it takes a lot of time to restore the equipment. An accident will occur.

On the other hand, if the switching is too slow, excessive tension will be applied to the material to be wound and the product will not be produced.If the tension is too large, the material to be wound will break and scatter. This is an accident that requires a lot of time to restore the equipment.

[Purpose of the invention]

The object of the present invention is to enable easy installation at a desired location and to provide highly reliable detection even under adverse environments such as heat, water vapor, etc. splashes, vibrations, and space constraints in hot rolling equipment as described above. The goal is to provide a detector that can perform

[Summary of the invention]

The key point of the present invention is to detect as fluid pressure when the injected fluid is blocked or passed depending on the presence or absence of the rolled material, and to guide the detected fluid pressure to any location in a good environment away from the detection point. After guiding through the pressure tube, it is converted into an appropriate signal such as an electric signal or an optical signal, and a signal indicating the presence or absence of the rolled material is sent out.

[Embodiments of the invention]

Conventionally, when installing a rolled material detector, one of the difficult places to install it is the hot steel plate winding device (hereinafter abbreviated as DC) due to lack of space, high temperature, splashing of water vapor, etc. .

An embodiment in which the detector of the present invention is applied to this DC will be described with reference to FIGS. 1 and 2.

In FIG. 1, DCI is pinch roll 2. Mandrel 3. It is composed of a presser roll 4, a drive mechanism thereof, and ancillary mechanisms. Also, during operation, the temperature of the rolled material is 800℃.
℃, and the cooling water sprayed onto each roll accumulates as water vapor and droplets.

Due to these conditions, conventional HMDs are unable to perform MW within or near DC.

Note that 11 is a water pressure source, and 2o is a detection device.

Since the present invention only requires installing a single pipe of about 5φ to 10φ, it can be easily installed between the pinch roll 2 and the mandrel 3 in the DCI, as shown in FIG.

The details of the detector according to the present invention will be explained with reference to FIG.

Pressure water is injected from the injection nozzle 21, this water pressure is detected by the fluid pressure detection section 22, and a detection signal 13 is output.

At this time, if the detected object 5 is present between the injection nozzle 21 and the fluid pressure detection section 22, the pressure water is cut off,
It does not reach the fluid pressure detection section 22.

Therefore, since no water pressure is applied to the fluid pressure detection section 22, the detection signal 13 is not output.

Therefore, the presence or absence of the detected object 5 can be detected.

Next, the configuration and operation of the fluid pressure detection section 22 will be explained.

When the pressurized water hits the receiving plate 4I, it pressurizes the sealed oil 44 at atmospheric pressure in order to move the piston 43 in the cylinder 42 to the right in FIG.

The pressure generated in the oil 44 is transmitted to the cylinder 49 through the pressure guide pipe 45 and acts on the pressure detection section 47 . At this time, the pressure detection section 47 transmits a pressure detection signal to the detection signal transmission section 48.

As a result, a detection signal 13 is obtained.

According to this embodiment, the following effects can be achieved by controlling the DC.

Before the DC starts winding the rolled material (steel plate), automatic speed control is added to the control device of the mandrel drive motor at a speed that is approximately 5% faster than the conveyance speed of the rolled material in order to smooth the initial winding. I'm waiting.

Just before the material to be wound (rolled material) by the mandrel reaches the mandrel, automatic speed control is switched to automatic tension control and the corrugated material is wound by the mandrel.

This means that after the material to be wound is wound around the mandrel, the quality of the material will not change.

Further, in order to obtain a good shape for winding, it is necessary to always apply a desired tension to the material to be wound while winding.

A multiple finishing rolling stand (hereinafter referred to as F) is installed in the hot rolling equipment.
Conventionally, it has also been impossible to attach a rolled material detector to a stand (abbreviated as a stand). The reason for this is that the rolling equipment of around 6 stands is arranged in series, so there is no space for installation, and in addition, the radiant heat of the rolled material at around 1200°C, the jet water for descaling, and the roll cooling water. This is due to adverse environmental conditions such as water splashing onto hot rolled material and a large amount of steam building up.

Normally, this detection of F-stand rolled material is carried out by passing the output of the rolling load meter of each rolling stand through a comparator set to a certain constant value.

However, the conventional method involves rolling under a light load or in an empty pass (simply passing through a stand without applying any load).
(transfer), it has the disadvantage that detection of the rolled material is impossible. Furthermore, during actual operation, malfunctions may occur due to the impact when the rolled material is caught in the rolled material, and the automatic operation control from rolling material detection to rolling material tracking is disrupted, leading to blind operation, which causes rolling to stop and defective products to occur. There were drawbacks such as.

As shown in Fig. 3, the present invention allows a detector to be easily installed between each stand, and the operation of this detector is extremely reliable, so that reliable rolling material detection and rolling material tracking can be achieved. →Automatic driving control can be realized.

In addition, the present invention can be widely applied in addition to the above-mentioned two embodiments, to sprays for adjusting the temperature of rolled material in rough rolling mills in hot rolling equipment, runout tables, etc., and can be applied to ensure reliable rolling. Materials can be detected.

〔Effect of the invention〕

According to the present invention, a detector for rolled material can be installed in an extremely small occupied space with a poor environment.

[Brief Description of the Drawings] Fig. 1 is a system diagram showing an example in which the detector according to the present invention is applied to DC, Fig. 2 is a detailed configuration diagram of the detector according to the present invention, and Fig. 3 is a diagram showing the detector according to the present invention. It is a figure which shows the example which applied to F stand. 5... Rolled material, 13... Detection signal, 21... Injection nozzle, 22... Fluid pressure detection section, 41... Receiving plate, 42.4
9... Cylinder, 43... Piston, 44... Oil, 45... Impulse tube, 46... Ring, 47... Pressure detection section, 48... 1st hardwood 2 Hard grass 3 b

Claims (1)

[Scope of Claims] (1) In a rolled material detection device for controlling hot rolling equipment, a fluid injection nozzle and a fluid pressure detection section that detects the pressure of the fluid injected from the injection nozzle are connected to a rolled material detection device for controlling hot rolling equipment. The heating device is arranged at a relative position across a passage, and the fluid pressure detected by the fluid pressure detection section is guided to an arbitrary location by a impulse pipe, and then the fluid pressure is converted into a signal and sent out. Inter-rolled material detection device.