JP2008221271A - Plate damage measuring instrument - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plate damage measuring instrument capable of solving problems caused by variations in the moving speed of a sliding plate, improving measurement accuracy of the damage length on a sliding face, and further improving reliability of the instrument. <P>SOLUTION: The plate damage measuring instrument includes: a measuring instrument main body 2 having an injection hose 4, which is fitted to the front end part of a nozzle 17 and injects air into a sliding opening/closing device 14, and a sucking hose 5, which sucks the air injected from the injection hose 4 and returned from the sliding opening/closing device 14; a regulator, which is connected to an outer air source and regulates the pressure of the air injected from the measuring instrument main body 2; a pressure sensor for measuring the pressure of the air that is regulated by the regulator and injected from the injection hose 4, and measuring the pressure of the air that is suctioned from the sucking hose 5; and a moving distance measuring instrument 21 for measuring the moving distance of a sliding plate 16. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention measures the degree of adhesion or damage between the fixed plate and the sliding raceway surface of the sliding plate, which is used in the sliding opening and closing device attached to the tap of a molten metal container that melts metal such as a ladle. In particular, it is possible to measure the degree of adhesion or damage of the sliding track surface of each plate simply and quantitatively at the site of use without disassembling and opening the sliding opening / closing device. The present invention relates to a plate damage measuring instrument.

  In general, a sliding opening / closing device is mounted below the outlet of a molten metal container that is a container for melting metal such as a ladle.

  About 70% of the causes of steel leakage from the sliding surface of this sliding switchgear are said to be due to damage to the fixed plate and sliding plate, and the usage limit of both plates is judged by the state of the sliding surface. Has been.

  However, even if the damage to the plate is not inferior, the fixed plate is not suitable for the sliding opening / closing device itself, mechanical thermal deformation of the plate, mounting method of the plate, drawing of the metal into the sliding surface, etc. In addition, the sliding surface of the sliding plate, especially in the vicinity of the tap hole and the through-hole passing through, is obstructed, causing a partial contact, creating a space on the sliding surface and causing a steel leak. There was a risk of occurrence. In addition, the fact that the sliding surface is prevented from adhering and there is even a small amount of air has the disadvantage that air is sucked into the sliding surface from the outside, which has a considerable effect on steel contamination.

  For this reason, in an actual use site, the damage state of the sliding surface of the fixed plate and the sliding plate is judged by disassembling and visually confirming the sliding opening / closing device, but depending on this method, Although the extent of the damage state can be determined, there is a limit that the contact state of the sliding surface cannot be determined.

  Accordingly, the applicant of the present application is a plate damage measuring instrument that can more easily and quantitatively measure the contact state and damage state of the sliding surface along the vicinity of the through hole without disassembling the sliding opening / closing device. (See Patent Document 1).

Japanese Patent Laying-Open No. 2005-095974

  The measuring instrument includes a measuring instrument body and a control box. Cover this measuring device body on the tip of the nozzle that takes out the molten metal attached to the sliding plate, send air through the control box into the measuring device body and into the nozzle, and return to the control box while moving the sliding plate Measure the pressure difference between. The state where the pressure of the air to be fed and the pressure of the returning air becomes equal is a state in which the sliding surfaces of the fixed plate and the sliding plate are in close contact with each other in the vicinity of the through hole. Then, the timer built in the control box measures the time from the start of moving the sliding plate until the pressure of the air to be fed and the pressure of the returning air becomes equal, so-called a close contact state. The damage length of the sliding surface from the end of the through hole is calculated by multiplying the moving speed of the sliding plate.

  Originally, a driving device for moving the sliding plate is attached to the sliding opening / closing device. This drive device is configured to operate by hydraulic and electric cylinders. In general, the moving speed of the sliding plate is about 20 mm / second by design, but the actual sliding surface is subjected to a surface pressure of 6000 kg or more. The movement speed of the sliding plate of the sliding opening and closing device at the actual usage site is several mm / second due to the movement speed changing depending on the surface damage state and the response speed of the hydraulic and electric cylinders is not so fast. There is a certain degree of variation. Therefore, when the time until the sliding surface is brought into close contact is long, the damage length of the sliding surface is greatly different depending on which moving speed is used as a reference.

  The present invention has been made in view of these points, and has improved the plate damage measuring instrument to solve the problem caused by variations in the moving speed of the sliding plate, and to improve the accuracy of measuring the damage length of the sliding surface. It aims at providing the plate damage measuring instrument which can be improved more and can improve reliability.

  In order to achieve the above-described object, the plate damage measuring instrument of the present invention is characterized by an injection hose that is attached to the tip of the nozzle and injects air into the sliding opening and closing device, and a sliding opening and closing device that is injected from the injection hose. A measuring instrument main body having an intake hose for sucking in air returning from the air, a regulator connected to an external air source for adjusting the pressure of the air injected from the measuring instrument main body, and the air adjusted by the regulator and injected from the injection hose. It has a pressure sensor for measuring the pressure, the pressure of the air sucked from the suction hose, and a moving distance measuring device for measuring the moving distance of the sliding plate.

  By adopting such a configuration, when the measuring instrument body is put on the tip of the nozzle of the sliding opening and closing device that is attached to the outlet of the molten metal container and is fully opened, the sliding plate is slid in the fully closed direction. At the same time, the air adjusted to a constant pressure by the regulator is continuously injected into the sliding opening / closing device, and the pressure of the injected air and the pressure of the air sucked back from the sliding opening / closing device coincide with each other in the pressure sensor. It can be confirmed that the sliding raceway surfaces of the fixed plate and the sliding plate of the sliding opening / closing device are sealed. Then, the sliding distance of the sliding plate in the time from the start of sliding of the sliding plate to the time when the pressure of the injected air and the pressure of the sucked air coincide with each other is directly measured by the moving distance measuring device. By subtracting the hole diameter of the through hole of the sliding plate from the sliding distance, it is possible to accurately measure the length of damage from the hole end of the sliding track surface of the sliding opening / closing device.

  Another feature of the plate damage measuring instrument according to the present invention is that the injection hose and the suction hose are formed by separate hoses or a common hose.

  By adopting such a configuration, it is assumed that only air is sent from the nozzle to the inside, and the sliding plate is moved while measuring the air feed amount to be fed, and a change point at which the air feed amount is greatly reduced is obtained. Thus, the position of the end portion of the damage can be detected.

  According to the plate damage measuring instrument of the present invention, the sliding opening and closing device can be easily and accurately opened from the hole end on the sliding track surface of each plate of the sliding opening and closing device without disassembling and opening from the outlet of the molten metal container. The length of damage can be measured.

  As a result, the work for checking the damage of the plate can be made extremely safe, and the occurrence of joint breakage or deformation of the plate accompanying the conventional work for checking the damage can be completely removed, and the life of the plate can be extended.

  Further, the length of damage of each plate due to the number of times the sliding opening / closing device is used can be predicted, and the replacement timing of the sliding opening / closing device can be predicted, so that a steel leakage accident can be prevented in advance.

  Hereinafter, embodiments of the plate damage measuring instrument of the present invention will be described with reference to the drawings.

  1 is a schematic diagram showing an embodiment of a plate damage measuring instrument of the present invention, FIG. 2 is a block diagram showing the configuration of the plate damage measuring instrument of FIG. 1, and FIGS. 3 (a) and 3 (b) are sliding opening / closing devices. It is the schematic which showed the open / close state of.

  As shown in FIG. 1, the plate damage measuring instrument 1 in this embodiment is a sliding opening / closing device 14 attached to a hot metal outlet (both not shown) of a molten metal container that is a container for melting metal such as a ladle. The measuring instrument main body 2 mounted on the tip of the nozzle 17 described later, the control box 3, and the moving distance measuring instrument 21 for measuring the moving distance of the sliding plate 16 described later of the sliding opening and closing device 14 are provided. The moving distance measuring device 21 irradiates an object to be measured (the measuring device main body 2 in the present embodiment) that moves together with the sliding plate 16 with infrared laser light or the like, receives the reflected light, and receives the distance. It is good to measure.

  The sliding opening / closing device 14 includes a fixed plate 15 and a sliding plate 16 each made of refractory brick. The fixing plate 15 is formed with a through hole 15a that coincides with the outlet of the molten metal container, is fixed to the molten metal container, and is moved together with the molten metal container side.

  The sliding plate 16 is slidably disposed on the surface of the fixed plate 15, and has a through hole 16a corresponding to the through hole 15a of the fixed plate 15. Further, the through hole 16a A detachable taper-shaped nozzle 17 through which molten steel flows is mounted. Note that a control device (not shown) for controlling the sliding of the sliding plate 16 is connected to the sliding opening and closing device 14, and the sliding of the sliding plate 16 is controlled by this control device. Thus, the sliding opening / closing device 14 can be opened and closed, and the sliding speed of the sliding plate 16 can be set.

  The measuring instrument body 2 is formed in a bottomed trumpet shape having a tapered inner surface that is closely attached to the tip of the nozzle 17 of the sliding plate 16. Two holes (not shown) are formed in the side surface 2a forming the bottom of the measuring device main body 2, and each hole has an injection hose 4 for injecting air to be fed to the nozzle 17 of the sliding plate 16, and One end of the suction hose 5 for sucking air returning from the nozzle 17 is connected to each other, and the other end of the injection hose 4 and the suction hose 5 is connected to the control box 3.

  The control box 3 is connected to an external air source (not shown) such as a compressor for sending air injected from the injection hose 4 by an air hose 6.

  As shown in FIG. 2, the control box 3 includes a regulator 7 that is connected in the middle of the air hose 6 and adjusts the pressure of the air injected from the injection hose 4, and the injection hose adjusted by the regulator 7. 4, a pressure sensor 8 for measuring the pressure of air injected from the suction hose 5 and the pressure of air sucked from the suction hose 5, a control device 9 for operating the constituent parts in association with each other, and a slide sent from the moving distance measuring device 21 by radio. The communication device 10 that receives the moving distance L of the sliding plate 16 in the time from the start of sliding of the moving plate 16 to the time when the pressure of the injected air and the pressure of the sucked air coincide with each other, and outputs it to the control device 9 The input means 11 for inputting the hole diameter D of the through hole 16a of the sliding plate 16 and the moving distance of the sliding plate 16 sent from the moving distance measuring device 21 Is calculated by the arithmetic unit 12 and the arithmetic unit 12 for subtracting the hole diameter D of the through-hole 16a input from the input means 11 to calculate the length of damage from the hole end of the sliding track surface of the sliding opening / closing device 14. A storage device 13 for storing the damaged length and a battery 22 are provided. The pressure sensor 8 is connected to a release hose 23 that returns air.

  Further, the control box 3 includes a display device 23 such as a liquid crystal, and the air pressure measured by the pressure sensor 8 and the moving distance of the sliding plate 16 measured by the moving distance measuring device 21. L and the damage length calculated by the arithmetic unit 12 can be displayed.

  The control device 9 starts measurement of the moving distance of the sliding plate 16 by the moving distance measuring device 21 in synchronization with the start of sliding of the sliding plate 16 of the sliding opening / closing device 14 and receives it by the communication device 10. The moving distance of the sliding plate 16 until the pressure of the air adjusted by the regulator 7 in the pressure sensor 8 and injected from the injection hose 4 coincides with the pressure of the air sucked from the suction hose 5. L is set to be received through the communication device 10.

  Next, the operation of the plate damage measuring instrument 1 of the present embodiment having the above-described configuration will be described.

  After using the sliding opening / closing device 14 attached to the outlet of the molten metal container several times, the molten steel in the molten metal container is removed and the sliding opening / closing device 14 is fully opened as shown in FIG. The tip of the nozzle 17 of the sliding plate 16 is mounted so as to cover the measuring instrument main body 2 of the plate damage measuring instrument 1. At this time, an adhesive material (not shown) that can be used at a high temperature such as heat-resistant packing or mortar is brought into close contact with the contact surface between the measuring instrument main body 2 and the nozzle 17 as a sealing material. In FIG. 3A, the hatched portion exaggerates the damaged portions of the plates 15 and 16.

  Then, the air sent from the external air source by the air hose 6 is adjusted to a constant pressure by the regulator 7, and the air is sent from the injection hose 4 into the sliding opening / closing device 14.

  Next, the sliding of the sliding plate 16 is started. Simultaneously with the operation of the sliding plate 16, the control device 9 of the control box 3 starts the measurement of the moving distance of the sliding plate 16 by the moving distance measuring device 21 and receives it by the communication device 10.

  Then, as shown in FIG. 3 (b), the sliding plate 16 is slid, and air injected from the injection hose 4 in the pressure sensor 8 and returned from the sliding opening / closing device 14 and sucked from the suction hose 5. When the air pressure matches (the fixed plate 15 and the sliding plate 16 are in close contact), the pressure of the air injected from the injection hose 4 and the suction hose 5 from the start of the movement of the sliding plate 16 The control device 9 receives the movement distance L of the sliding plate 16 up to the time when the air pressure coincides with the communication device 10. In FIG. 3 (b), the hatched portion exaggerates the damaged portions of the plates 15 and 16.

  And the hole diameter D of the through-hole 16a of the sliding plate 16 of the sliding opening / closing apparatus 14 used several times is measured, and the hole diameter D of the through-hole 16a is input by the input device 11. When the hole diameter D is inputted, the arithmetic device 12 subtracts the hole diameter D of the through hole 16a inputted by the input means 11 from the movement distance L of the sliding plate 16 sent from the movement distance measuring device 21. The length of damage from the hole end of the sliding track surface of the sliding opening / closing device 14 is calculated and stored in the storage device 13 and displayed on the display device 23.

  Furthermore, the storage device 13 stores the sliding distance from the fully open state of the sliding opening / closing device 14 calculated by the arithmetic unit 12 to the time when the sliding plate 16 is slid and the sliding track surface is sealed. By doing so, it is possible to statistically determine the degree of damage due to the number of times of use, predict the replacement time of the sliding opening / closing device 14, and determine the sliding track surface of each plate 15, 16 of the sliding opening / closing device 14. A steel leakage accident due to damage can be prevented.

  After the sliding opening / closing device 14 comprising the fixed plate 15 and the sliding plate 16 each having a through hole 15a, 16a having a hole diameter of 35 mm is mounted on the outlet of the molten metal container and used for 5 charges, the plate damage measurement of the present invention is performed. The damage length L from the hole end of the sliding raceway surface of the sliding opening / closing device 14 is measured by the instrument and the device described in Japanese Patent Application Laid-Open No. 2005-095974, and at the same time, the fixing plate 16 after using 5 charges. Was removed from the sliding opening / closing device 14, the hole diameter D of the through hole 16a was measured, and the results were compared. In order to obtain the damage length L, the following measurement items a to d were obtained. In addition, the hole diameter D of the through-hole 16a of the fixed plate 16 after completion | finish of 5 charge was 37.3 mm.

<Measurement item>
a: Movement speed of the sliding plate b: Time from the start of moving the sliding plate to the close contact state (time until the pressure of the air to be fed and the pressure of the returning air become equal)
c: Movement distance from the start of moving the sliding plate to the contact state d: Damage length of the sliding surface from the fixed plate hole end to the sliding plate hole end

２） 本発明の装置による結果は次の表２の通りである。

３） 摺動開閉装置１４から取り外した固定プレート１６の現物の損傷長さＬを測定した結果は、損傷長さ＝８８．１ｍｍであった。 <Measurement results>
1) The results of the apparatus described in JP-A-2005-095974 are shown in Table 1 below.

2) The results of the apparatus of the present invention are as shown in Table 2 below.

3) The result of measuring the actual damage length L of the fixed plate 16 removed from the sliding opening / closing device 14 was the damage length = 88.1 mm.

<Evaluation>
5 When a conventional measuring instrument (Japanese Patent Laid-Open No. 2005-095974) is used after the end of charging, it will be 6.0-6. Although there was hardly any variation of 1 second, the moving speed of the sliding plate 16 was 17.9 to 21.5 mm / second, with a maximum variation of 3.6 mm / second. As a result, the damage length L of the sliding surface from the hole end of the through hole 15a of the fixed plate 15 to the hole end of the through hole 16a of the sliding plate 16 is also 71.9 to 91.7 mm, which is a maximum variation of 19.8 mm. It was observed.

  In contrast, in the case where the plate damage measuring instrument of the present invention is used, it takes 6.0 to 6.2 seconds from the start of moving the sliding plate 16 in three measurements until it comes into close contact. As in the case of using a conventional measuring instrument (Japanese Patent Laid-Open No. 2005-095974), there is almost no variation, and the moving distance from the start of moving the sliding plate 16 to the contacted state is also 126.1 to 127. There was almost no variation of 0.5 mm. As a result, the damage length L of the sliding surface from the hole end of the through hole 15a of the fixed plate 15 to the hole end of the through hole 16a of the sliding plate 16 was 88.8 to 90.2 mm, and there was almost no variation. .

  Furthermore, when the sliding plate 16 after actually using 5 charges was removed from the sliding opening / closing device 14 and measured, the sliding from the hole end of the through hole 15a of the fixed plate 15 to the hole end of the through hole 16a of the sliding plate 16 was performed. Since the damage length L of the moving surface was 88.1 mm, the measurement result of the plate damage measuring instrument of the present invention and 0.1 to 2.1 mm showed almost no error.

  As described above, the plate damage measuring instrument of the present invention measures the time until the sliding surface is brought into close contact as in the conventional example, and multiplies this by the moving speed of the sliding plate 16 so that it can be removed from the hole end. Instead of calculating the damage length L of the sliding surface, a method of directly measuring the moving distance of the sliding plate 16 until the sliding surface comes into close contact is adopted. Thereby, according to the plate damage measuring instrument of this invention, the problem by the variation in the moving speed of a sliding plate was solved, it was made to improve from a measurement precision, and it was able to improve reliability.

  In addition, this invention is not limited to embodiment mentioned above, A various change is possible as needed.

  For example, as in the second embodiment in Japanese Patent Application Laid-Open No. 2005-095974, by providing the injection hose 4 and the suction hose 5 in common, the air is taken out from the nozzle 17 only by sending the air into the inside. Detecting the position of the end of the damage by omitting the suction hose 5 and moving the sliding plate 16 while measuring the amount of air supplied, and finding the changing point where the amount of air supplied is greatly reduced. You may make it do.

Schematic which shows one Embodiment of the plate damage measuring instrument of this invention. The block diagram which shows the structure of the plate damage measuring instrument of FIG. Schematic showing the open / closed state of the sliding switchgear

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plate damage measuring instrument 2 Measuring device main body 3 Control box 4 Injection hose 5 Suction hose 6 Air hose 7 Regulator 8 Pressure sensor 9 Control device 10 Timer 12 Arithmetic device 13 Storage device 14 Sliding switch 15 Sliding plate 16 Fixed plate 17 Nozzle 21 travel distance measuring device

Claims (2)

A fixed plate fixed to the outlet of the molten metal container and having a through hole formed therethrough, and a through hole that is slidably disposed with the fixed plate and matches the through hole of the fixed plate And a sliding plate having a nozzle erected corresponding to the through-hole, and adjusting the opening degree of the outlet by sliding the sliding plate, In the plate damage measuring instrument that measures the adhesion or damage of the sliding raceway surface,
A measuring instrument comprising an injection hose that is attached to the tip of the nozzle and injects air into the sliding opening and closing device, and an intake hose that injects air that has been injected from the injection hose and returned from the sliding opening and closing device A main body, a regulator connected to an external air source and adjusting the pressure of air injected from the measuring instrument main body, the pressure of air adjusted by the regulator and injected from the injection hose, and the air sucked from the suction hose A plate damage measuring instrument comprising: a pressure sensor for measuring the pressure of the sliding plate; and a moving distance measuring device for measuring a moving distance of the sliding plate.   2. The plate damage measuring instrument according to claim 1, wherein the injection hose and the suction hose are formed by separate hoses or a common hose.

Images