JPH04210812A - Method for detecting nozzle clogging of devices related to cooling/lubrication of rolling mill - Google Patents

Abstract

PURPOSE:To detect nozzle clogging from the change of measured values by moving a temp. sensor or pressure sensor just under the ejecting part of nozzle and in parallel with a group of nozzles and measuring the temp. or ejecting pressure of ejecting water or oil. CONSTITUTION:The temp. sensor 3 or a fixing table 4 on which the pressure sensor is fixed is moved just under the ejecting part of nozzle 2 and in parallel with this group of nozzles. Because the temp. or pressure of the ejecting part of nozzle is directly measured using the temp. sensor or pressure sensor, nozzle clogging can be surely detected. And the nozzle which clogging is generated can be specified by successively measuring each nozzle by moving the sensor. Then also the diagnosis of ejecting angle is possible by adjusting a locus on which the sensor is moved and a distance from the ejecting part.

Description

[Detailed description of the invention]

[00011

[Field of Industrial Application] The present invention relates to a method for detecting nozzle clogging of cooling water or rolling oil in a rolling mill. [0002] Generally, when a nozzle that spouts cooling water or rolling oil during rolling is clogged, heat streaks and streak patterns occur due to insufficient lubrication and cooling, which poses a major problem in terms of quality control. Therefore, in order to detect nozzle clogging at an early stage, as disclosed in Japanese Patent Application Laid-Open No. 61-249562,
A pressure detector is installed in the middle of the piping from the pump outlet side to the nozzle.
A method of detecting nozzle clogging by installing a flow rate detector to detect pressure and flow rate and comparing it with the theoretical value of pressure and flow rate obtained from the nozzle characteristic curve,
As in Japanese Patent Application Laid-Open No. 54-57452, a standard value of the heat-up amount of the roll crown is determined as a function of the rolling amount, and the heat-up amount at any rolling amount is detected.
A method of detecting clogging of an injection nozzle by monitoring is known. [0003]

[Problem to be solved by the invention] JP-A-61-2495
The method of detecting the pressure and flow rate in the header piping as disclosed in Japanese Patent No. 62 has a problem in that the flow meter cannot identify the occurrence of clogging in the piping or the clogged nozzle. Furthermore, with the method of detecting the amount of heat-up of the roll crown as disclosed in JP-A-61-249562, it is difficult to determine the standard value of the amount of heat-up in rolling mills that roll a wide variety of products and sizes. There was a problem. An object of the present invention is to provide a nozzle clogging detection method that solves these problems. [0004]

[Means for Solving the Problems] In order to solve the above problems, the present invention detects nozzle clogging by using a temperature sensor or a pressure sensor that passes near the water or oil spouting part of the nozzle. It is. The present invention employs the following method for detecting nozzle clogging of cooling water or rolling oil nozzles in a rolling mill. In other words, in order to detect nozzle clogging of cooling water or rolling oil nozzles in a rolling mill, a temperature sensor or pressure sensor is moved directly below the nozzle spouting section in parallel with the nozzle group to measure the temperature of the jetting water or oil. Alternatively, the present invention is a method for detecting nozzle clogging in a rolling mill cooling/lubrication-related device, which is characterized by measuring ejection pressure and detecting nozzle clogging from a change in the measured value. [0005]

According to the present invention, since the temperature or pressure of the nozzle ejection part is directly measured using a temperature sensor or a pressure sensor, nozzle clogging can be reliably detected. Furthermore, by moving the sensor and sequentially measuring each nozzle, it becomes possible to identify the nozzle where the clog has occurred. [0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of the present invention in which a temperature sensor is used. In this case, a thermistor type sensor was used as the temperature sensor, and the sensor was moved 30 mm from the ejection part of the nozzle that ejected palm oil at about 70°C. The second measurement result when the nozzle was clogged
As shown in the figure. [00071 In FIG. 2, the horizontal axis shows the position of the sensor relative to the nozzle arrangement, and the vertical axis shows the sensor output at a certain position converted into temperature. In this measurement, the nozzle located 400 mm from the end was intentionally clogged, but as you can see from the measurement results, the detected temperature was lower at the position where the nozzle was clogged. I know that there is. As described above, the nozzle clogging detector according to the present invention makes it possible to identify not only the presence or absence of nozzle clogging, but also the nozzle in which the clogging has occurred. [0008] In the above embodiment, a temperature sensor was used to detect clogging of the palm oil spouting nozzle, but the same function can be achieved using a pressure sensor or detecting clogging of a coolant nozzle. Of course you can get it. [0009]

[Effects of the Invention] The present invention has the following excellent effects. ■ It is now possible to reliably detect nozzle clogging and to identify the nozzle where the clogging occurs. ■ By adjusting the trajectory of the sensor and the distance from the jetting part, it is possible to diagnose the jetting angle, which is difficult to do visually.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a device (detection device using a temperature sensor) that can suitably implement the present invention.

FIG. 2 is an explanatory diagram of the operation of the present invention.

[Explanation of symbols]

1 Ladder to rolling oil 2 Nozzle 3 Temperature sensor 4 Sensor fixing base 5 Sensor movement rail 6 Squirting palm oil 7 Drive device for sensor feeding

Claims (1)

[Claims] [Claim 1] In order to detect nozzle clogging of cooling water or rolling oil nozzles in a rolling mill, a temperature sensor or a pressure sensor is moved directly below the spouting part of the nozzle in parallel with the nozzle group to detect the water spouting. Alternatively, a method for detecting nozzle clogging in a rolling mill cooling/lubrication-related device, characterized by measuring oil temperature or jetting pressure, and detecting nozzle clogging from a change in the measured value.