JPH0251707B2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention relates to a slide gate plate (hereinafter referred to as SN method) for controlling the flow rate of molten metal.
More specifically, it relates to a plate for a sliding gate made by bonding a high-density rock wool board to the back side of a plate brick.

(Prior art) Conventionally, as is well known, the back side of the SN plate brick was designed to effectively block the heat of the heated plate brick, and the back side of the plate brick and the metal frame for fixing the plate brick had slight irregularities. A heat-resistant flexible sheet is bonded for the purpose of absorbing heat and improving adhesion, and eliminating the hassle of setting work due to the use of mortar and simplifying it.

(Problems to be Solved by the Invention) Currently, asbestos boards, which are well known, are most commonly used as heat-resistant flexible sheets having such elasticity and heat resistance. However, for this asbestos board, the maximum operating temperature is 500~
Although the heat resistance is high at 600℃, there is no problem with heat resistance, but as shown in Figure 1, the compression properties are low overall, and in particular, the spring pressure is 10% higher than that of the plate bricks to prevent steel leakage between the plates of the plate bricks. ~20Kg/
^cm2 , and the compression properties under this 10-20Kg/ ^cm2 are as low as 0.5-1.2%.Since the thickness of the back cushion material normally used is 2-5mm, plate bricks and plate bricks are The problem remains that the adhesion between the plate surfaces is insufficient because the buffering effect of the slight irregularities of the metal frame to which it is fixed is not sufficient.

In addition, recently, the issue of pollution caused by asbestos boards to the human body has been brought into focus, and users are calling for the prohibition of their use.
This is because it has become very difficult to adhere SN plates to the back side of bricks.

The use of flame-retardant paper and rock wool board as back cushion materials to replace this asbestos board is being considered, but flame-retardant paper has a low maximum operating temperature of 300 to 400 degrees Celsius, and as shown in Figure 2. As shown in Fig. 1, the weight loss during heating is large, and the heat resistance and thermal change (dimensional shrinkage during carbonization) in actual use are ^large .
There are problems such as a high rate of around %.

Furthermore, the maximum operating temperature for rock wool boards is as high as 600 to 700℃, and as shown in Figure 2, the weight loss during heating is small, so there is no problem with heat resistance, but as shown in Figure 3, there are Strength is 10Kg/
^cm2 , and the compression properties are as low as 20cm2 as shown in Figure 1.
There are problems such as being high at around 20% under Kg/cm ² , and none of them meet the requirements for back cushioning material for SN plate bricks, so they cannot be used as a floating product. The current situation is that there is no such thing.

(Means for solving the problem) Therefore, this invention has the heat resistance, which is necessary for the back cushion material of SN plate bricks.
As a back cushion material that satisfies elasticity and replaces asbestos boards, which pose a problem for human body pollution, the density of rock wool board has been increased to 0.8 to 1.4 g/cm ³ in consideration of its heat resistance. It is characterized by the use of rock wool board that has both tensile strength and improved compression properties.

Fig. 1 shows the compression characteristics of this rock wool board, Fig. 2 shows the weight loss at various temperatures, and Fig. 3 shows the tensile strength.

In terms of compression properties, the higher the density, the lower the compression properties, which are around 10% under 10 to 20 kg/cm ² during actual use, which is sufficient to compensate for slight irregularities on the metal frame that fixes the plate bricks and the back side of the plate bricks. This is a value that can be buffered, and the weight loss during heating is small, so it is considered that there are no problems with regard to heat resistance and compression properties.

In addition, the tensile strength, which is the biggest problem with conventional rock wool boards, is increased by 5 to 10 times to 50 to 80 kg/cm ² by increasing the density, making it difficult to handle and set in a metal frame. There will be no damage and workability will be improved.

The density of this rock wool board is 0.8g/
Below cm ³ , the density of traditional rock wool board
There is not much difference between 0.5 and 0.6 g/cm ³ , but problems remain in compression properties and tensile strength, and the effect as a back cushion material is low. Conversely, if the density is 1.4/cm3 ^or higher, the compression ratio is 10.
~20Kg/cm ² is 3-5%, which is almost the same as asbestos board, and it cannot absorb the slight unevenness of the back of the plate brick and the metal frame that fixes the plate brick, and the adhesion is poor, and at the same time, the density is reduced during manufacturing. 1.4
It is very difficult to achieve a value of g/cm ³ or more, and problems such as very large variations in products arise.

From the above, in order to obtain the effect as a back cushion material as described above, the density must be 0.8 to 1.4 g/
It is preferable to make it cm ³ . Further, this rock wool board may be manufactured by any method such as a press method or a paper making method, and there is no problem as long as the density is 0.8 to 1.4 g/cm ³ .

In addition, as shown in Figure 4, the bonding method to the back side of the SN plate is that the lock wool board 2 attached to the SN plate brick 1 is sufficient as a back cushion material, but it also prevents tar from flowing out and prevents it from sticking to the metal frame. It may be used in combination with an iron plate 3, a tin plate 4, an aluminum plate 5, etc. for prevention.

(Effect of the invention) As described above, by using high-density rock wool board with a density of 0.8 to 1.4 g/cm ³ as the back cushion material of the SN plate brick, non-asbestos for pollution prevention is implemented, and asbestos board The same workability and effect as a back cushion material can be obtained, and there is no problem in actual use, and it can be used effectively and well.

[Brief explanation of drawings]

Figure 1 is a chart showing the compression characteristics of each back cushion material, Figure 2 is a chart showing the weight loss ratio at each temperature, and Figure 3 is a chart showing the tensile strength.
FIGS. 4A to 4C are partial vertical cross-sectional views of each embodiment of the slide gate plate of the present invention. 1...SN plate brick, 2...rock wool board, 3...iron plate, 4...tin plate, 5...
an alminium board.

Claims (1)

[Claims] 1 Density 0.8 to 1.4 g/cm ³ on the back side of the plate brick
A sliding gate plate featuring a high-density rock wool board (rock wool board) bonded to it.