Rock wool manufacturing equipment and manufacturing method

Abstract

Provided is a technique for producing rock wool which gives molded articles reduced in longitudinal-direction density deviation. This equipment comprises: a primary electric furnace where a main feedstock is heated to a given temperature and a composition-regulating material is added to obtain a given composition and thereby produce a molten material for rock wool; a first slide gate disposed at a tap-hole of the primary electric furnace, the degree of opening of the gate being controllable; a secondary electric furnace in which the molten material continuously supplied from the primary electric furnace is kept at a given temperature; a first mass detector which determines the mass of the secondary electric furnace holding the molten material therein; and a first control means which acquires signals from the first mass detector and gives opening-degree signals to the first slide gate. The equipment has been configured so that in cases when a signal from the first mass detector indicates a value exceeding a given deviation from a given mass, the first control means gives the first slide gate a signal which results in a predetermined degree of opening.

Description

[Technical Field]

[0001] The present invention relates to a rock wool manufacturing facility and manufacturing method, and more particularly to a technique for manufacturing rock wool with little density deviation in the longitudinal direction of a molded product. [Background technology]

[0002] In recent years, asbestos pollution problems have led to the rise of rock wool as a substitute for asbestos. Rock wool is a man-made mineral fiber made primarily from natural silicate ores such as basalt and andesite, which are melted in a cupola or electric furnace and then blown into fibers with a diameter of a few microns using centrifugal force or compressed air. Its main components are SiO2 and CaO, and it has excellent insulation, heat retention, fire resistance, and sound absorption properties, making it widely used in buildings, industrial facilities, industrial equipment, and other fields.

[0003] Incidentally, blast furnace slag discharged from blast furnaces has conventionally been water-granulated and reused as a cement raw material, concrete aggregate, ground improvement material, etc., but in recent years, because its composition is similar to the above-mentioned silicate ore, it has come to be used as the main raw material for rock wool.

[0004] In order to save energy, a typical method for producing rock wool using blast furnace slag as a raw material is to install a rock wool production facility near the blast furnace, transport the blast furnace slag discharged from the blast furnace in a molten state without cooling it, add auxiliary materials such as silica, adjust the composition to a predetermined level, and then mill it into cotton. For example, Patent Document 1 discloses a method in which two electric furnaces for producing rock wool are installed side by side, and the raw material charging, melting, composition adjustment, and temperature adjustment processes, and the heat retention and tapping processes are alternately repeated in the two electric furnaces, while the molten raw material is continuously supplied to the downstream process (a cotton mill). Patent Document 2 discloses a method in which two electric furnaces are connected together, and the molten blast furnace slag is melted and its composition adjusted in one electric furnace, the temperature is adjusted in the other electric furnace, and the molten raw material is then milled into cotton in the cotton mill.

[0005] In the production of rock wool, it is important from the perspective of rock wool quality control to adjust the amount of molten raw material tapped from an electric furnace to a cotton mill within a desired range. Therefore, Patent Document 3 discloses a technology in which the weight of the electric furnace is measured with a weight detector, the amount of molten material tapped per hour is calculated for each tap that is equal to or greater than the detection error, and the opening of a slide gate is automatically controlled to control the amount of molten raw material tapped from the electric furnace to a cotton mill at a constant amount. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 01-083535 [Patent Document 2] Japanese Patent Application Publication No. 62-065950 [Patent Document 3] Japanese Patent Application Publication No. 05-078144 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the above-mentioned conventional techniques have the following problems. The technology in Patent Document 3 uses one electric furnace, charges raw materials in a batch process, and then calculates the tapping rate from the rate at which the mass of the electric furnace decreases while the molten raw materials are continuously supplied from the electric furnace to the cotton mill. This technology is not applicable to cases where two electric furnaces are arranged in series and molten raw materials are continuously supplied from the primary electric furnace to the secondary electric furnace while a constant amount of molten raw materials is supplied from the secondary electric furnace to the cotton mill.

[0008] The present invention has been made in consideration of the above circumstances, and its object is to provide a rock wool manufacturing facility in which two electric furnaces are arranged in series to continuously and stably produce molten raw material with adjusted composition, with little density deviation in the longitudinal direction of the molded product, and a rock wool manufacturing method using the facility. [Means for solving the problem]

[0009] The rock wool manufacturing equipment of the present invention, which advantageously solves the above-mentioned problems, comprises a primary electric furnace that heats the main raw material to a predetermined temperature, adds a composition adjuster to adjust the composition to a predetermined component composition, and uses it as a molten raw material for rock wool; a first slide gate that is installed at the outlet of the primary electric furnace and has a controllable opening; a secondary electric furnace that keeps the molten raw material continuously supplied from the primary electric furnace at a predetermined temperature; a first mass detector that detects the mass of the secondary electric furnace in which the molten raw material is held; and first control means that acquires a signal from the first mass detector and sends an opening signal to the first slide gate, wherein the first control means is configured to send a signal to the first slide gate to open to a predetermined degree when the signal from the first mass detector exceeds a predetermined deviation amount from the predetermined mass.

[0010] The manufacturing equipment for Rock Cool according to the present invention is as follows: (A) the predetermined deviation amount is a multiple of the minimum detection value of the first mass detector; (A) the first control means is configured to grasp the effect that the opening and closing operation of the first slide gate has on the change in the signal of the first mass detector, and to change the opening degree signal to be given to the first slide gate; (c) Further, the apparatus has a second slide gate that is installed at the outlet of the secondary electric furnace and whose opening degree can be controlled, a cotton mill that turns the molten raw material continuously supplied from the secondary electric furnace into fibers, a cotton collection chamber that collects the fibers turned into fibers by the cotton mill and turns them into plate-shaped unformed piles, a conveying device that folds and stacks the unformed piles, hardens them in a hardening furnace installed in the conveying path to form plate-shaped molded products, and cuts them to a predetermined width and length, a second mass detector installed in the conveying device, and second control means that receives a signal from the second mass detector and gives a predetermined opening degree signal to the second slide gate, This is thought to be a preferable solution.

[0011] The rock wool manufacturing method of the present invention, which advantageously solves the above-mentioned problems, is a rock wool manufacturing facility that has two electric furnaces arranged in series, a first slide gate whose opening can be controlled at the outlet of the primary electric furnace, and a first mass detector that detects the mass of the secondary electric furnace, and when the mass of the secondary electric furnace exceeds a predetermined deviation amount from a target value, the opening of the first slide gate is changed to a predetermined value.

[0012] The method for producing rock cool according to the present invention is as follows: (d) setting the predetermined deviation amount to a multiple of the minimum detection value of the first mass detector; (e) understanding the effect of the opening and closing operation of the slide gate on the change in the signal of the first mass detector, and changing the opening range of the slide gate; (F) Further, the rock wool manufacturing equipment is provided with a second slide gate whose opening degree can be controlled at the outlet of the secondary electric furnace, and a second mass detector that detects the mass of the unmolded product deposit, adjusting the opening degree of the second slide gate so that the mass of the unformed product pile falls within a predetermined range; This is thought to be a preferable solution. [Effects of the Invention]

[0013] According to the present invention, in a rock wool manufacturing facility and manufacturing method in which two electric furnaces are arranged in series, the volume of molten raw material held in the secondary electric furnace is kept constant, thereby minimizing changes in the static pressure applied to the tapping port from the secondary electric furnace to the cotton mill, and making it possible to suppress fluctuations in the amount of molten raw material tapped into the cotton mill. This stabilizes the production volume of the cotton mill, and makes it possible to manufacture rock wool with little density deviation in the longitudinal direction of the molded product. By suppressing excessive density guarantees, productivity is also improved. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a schematic diagram showing a rock wool manufacturing facility according to one embodiment of the present invention. [Figure 2] 1A and 1B are schematic diagrams showing the top view of the electric furnace according to the embodiment, in which FIG. 1A shows the primary electric furnace and FIG. 1B shows the secondary electric furnace. [Figure 3] This shows a flow diagram for adjusting the opening of a slide gate installed at the outlet of a secondary electric furnace. [Figure 4] 10 is a graph showing an example of the transition of the mass fluctuation of the secondary electric furnace and the mass fluctuation of the unformed deposit on the secondary conveyor. [Figure 5] This shows a flow diagram for controlling the opening of a slide gate installed at the tapping port of a primary electric furnace. [Figure 6] 1 is a graph showing slide gate control of a primary electric furnace and transition of mass fluctuations in a secondary electric furnace according to the present embodiment. [Figure 7] 10A and 10B are graphs showing the progress of mass fluctuations in a secondary electric furnace, where (a) is the case where the opening degree of the slide gate of the primary electric furnace according to this embodiment is automatically controlled, and (b) is the case where the opening degree of the slide gate of the primary electric furnace is manually controlled by sliding. DETAILED DESCRIPTION OF THE INVENTION

[0015] The following describes in detail embodiments of the present invention. Note that the drawings are schematic and may differ from the actual embodiments. Furthermore, the following embodiments exemplify devices and methods for embodying the technical concept of the present invention, and are not intended to limit the configuration to those described below. In other words, the technical concept of the present invention can be modified in various ways within the technical scope described in the claims.

[0016] A rock wool manufacturing facility and a suitable manufacturing method according to one embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a conceptual diagram of a rock wool manufacturing facility 100 according to this embodiment. FIG. 2 is a conceptual diagram showing the top of an electric furnace. FIG. 2(a) shows a top view of a primary electric furnace, and FIG. 2(b) shows a top view of a secondary electric furnace. In this embodiment, blast furnace slag 1, which serves as the main raw material, is transported in a molten state from the blast furnace to the rock wool manufacturing facility 100 by freight cars or the like.

[0017] The rock wool manufacturing facility 100 of this embodiment includes a primary electric furnace 2, a secondary electric furnace 4, and a cotton mill 5. Further, downstream processes include a cotton collection chamber 8 and a product processing process PD, which includes processes for producing granular cotton and forming sheet-shaped molded products. In this embodiment, two electric furnaces are arranged in series. As shown in FIG. 1 , the primary electric furnace 2 is located upstream, and the secondary electric furnace 4 is located downstream, forming a series connection. The primary electric furnace 2 contains a predetermined volume (mass W1) of molten raw material 1b. Blast furnace slag 1 is added to the primary electric furnace 2 using a charging ladle 1a through a main raw material inlet 2e provided in the electric furnace lid 2b. The lower portions of multiple (usually three) electrodes 2a inserted into the furnace through the electric furnace lid 2b are immersed in the molten raw material 1b in the primary electric furnace 2, and the molten raw material 1b is heated by power from the electrodes 2a to maintain a constant temperature. The heating temperature is preferably around 1500°C.

[0018] In this embodiment, a gas bubbling lance 2d is inserted almost vertically into the center of the electric furnace lid 2b placed over the primary electric furnace 2, that is, through a lance insertion port provided corresponding to the center position of the three electrodes 2a, and its lower part is immersed in the molten material 1b inside the primary electric furnace 2. For example, an inert gas is supplied to the gas bubbling lance and blown into the molten material, forming a gas bubbling region in the center of the furnace.

[0019] The lower part of the auxiliary material feeding device 3a, which feeds a composition adjuster as the auxiliary material 3, is inserted into the lance insertion port, and the composition adjuster 3, such as silica stone or silica sand, is continuously fed into the gas bubbling area. The auxiliary material 3 is preferably pulverized to approximately 1000 μm or less, taking into consideration ease of addition and ease of dissolution. The lower part of the auxiliary material feeding device 3a may be configured to charge the material around the entire circumference of the gas bubbling lance. In this embodiment, it is preferable to supply the amount of gas from the gas bubbling lance necessary to completely dissolve the added composition adjuster 3.

[0020] In addition, a surface coating material is introduced onto the molten metal surface around the periphery of the primary electric furnace 2 by a surface coating material introduction device 11 through a surface coating material introduction port 2c provided on the electric furnace lid 2b. As with the composition adjuster 3, the surface coating material is made of silica sand, which covers the surface of the molten raw materials 1b and accumulates, insulating the heat from the molten raw materials 1b and protecting the refractory material inside the electric furnace lid 2b. It is effective to use a surface coating material with low thermal conductivity, as the unmelted surface coating material provides insulation and reduces the radiant heat emitted from the surface of the molten raw materials 1b, thereby reducing the power supplied from the electrodes 2a.

[0021] In this embodiment, molten raw material 1b is continuously supplied from the primary electric furnace 2 to the secondary electric furnace 4 through a spout 4d provided on the electric furnace lid 4b of the secondary electric furnace 4. A slide gate with an adjustable opening is provided at the spout of the primary electric furnace 2, and the molten raw material is supplied to the secondary electric furnace 4 while adjusting the amount of molten material being discharged. A predetermined volume (mass W2) of molten raw material 1b is stored in the secondary electric furnace 4. In this embodiment, rock wool is produced by continuously supplying the molten raw material 1b from the secondary electric furnace 4 to one or more cotton mills 5.

[0022] In this embodiment, the lower portions of multiple (usually three) electrodes 4a inserted into the secondary electric furnace 4 via the electric furnace lid 4b are immersed in the molten materials 1b in the secondary electric furnace 4, and the molten materials 1b are heated by the electric power from the electrodes 4a to maintain a constant temperature. In this embodiment, as with the primary electric furnace 2, a surface coating material that covers the surfaces of the molten materials 1b in the secondary electric furnace 4 is introduced from a surface coating material introduction port 4c provided in the electric furnace lid 4b by a surface coating material introduction device 11. This protects the inner surface of the electric furnace lid 4b from the heat of the molten materials 1b, reduces the radiant heat emitted from the surfaces of the molten materials 1b, and reduces the electric power supplied from the electrodes 4a.

[0023] The secondary electric furnace 4 degasses the molten raw material and serves to steadily supply the high-temperature molten raw material at 1500-1600°C to the next process, the cotton mill (spinner) 5. The molten raw material is continuously tapped from the secondary electric furnace 4 and dripped onto the outer surface of the rotating wheel 6 of the cotton mill 5, where it is blown by centrifugal force and turned into fiber. At the same time, high-pressure gas is flowed in the longitudinal direction of the wheel to promote fiberization.

[0024] The rock wool fibers 7 thus fiberized are simultaneously sprayed with a hardener and deposited on the primary conveyor 10a to form the unformed pile 9. The fibers are then folded multiple times by the pendulum 10c to a predetermined density and deposited on the secondary conveyor 10b. As they are transported in the longitudinal direction L of the secondary conveyor 10b, they are heated to a predetermined temperature in the hardening furnace 10d to form the rock wool molded products 9a of the predetermined density. The rock wool molded products 9a are cut to the same width and length by the cutting machine 10e, and then pass through a sealing machine, packaging machine, and winding machine (not shown) to form the rock wool molded products such as mats, boards, and felt.

[0025] For example, minimum and maximum densities may be guaranteed for rock wool molded products. Density variations occurred along the length of the molded products, resulting in products with insufficient density or excessive density. This was thought to be due to changes over time in the amount of molten raw material discharged from the secondary electric furnace 4 to the cotton mill 5. Therefore, a second mass detector 10f was installed on the secondary conveyor 10b, and a detection signal related to the mass of the unformed deposit 9 detected by the second mass detector 10f was sent to the control device 22. The control device 22 then performed automatic control (feedback) to adjust the opening of the slide gate 4f installed at the outlet of the secondary electric furnace 4. The control device 22 may be a computer, sequencer, or the like. The mass detector 10f may also be a load cell.

[0026] Figure 3 shows a flow diagram for adjusting the opening of the slide gate 4f installed at the outlet of the secondary electric furnace 4. The control device 22 first sets the target mass WP0 of the unformed pile 9 to be measured on the secondary conveyor 10b, which is the molded product transport path, based on the target density and target mass of the product. For example, it is set as a mass per unit area (S30).

[0027] The mass WP (S35) of the unformed pile detected by the mass detector 10f installed on the secondary conveyor 10b (molded product transport path) is compared with the target value WP0 (S31). If the absolute value of the difference between WP and WP0, i.e., the deviation (|WP-WP0|), is less than a predetermined deviation amount ΔWP, the opening of the slide gate 4f is left as is, but if it is greater than ΔWP, the opening of the slide gate 4f is adjusted (S32).

[0028] If there is any disturbance (S33), the amount of molten metal discharged from the secondary electric furnace 4 to the cotton mill 5 will fluctuate (S34). Then, the mass WP of the unformed pile is detected by the mass detector 10f installed on the secondary conveyor 10b (S35). The molded products that have passed through the secondary conveyor 10b are packaged and shipped (S36). Before shipping, the product mass (for example, density = mass per unit volume) is measured. The measured product mass is used to adjust the target mass.

[0029] The inventors' investigation revealed that the disturbance factor that causes fluctuations in the molten metal output from the secondary electric furnace 4 to the cotton mill 5 is the mass fluctuation of the secondary electric furnace 4, which is caused by fluctuations in the molten metal output from the primary electric furnace 2 to the secondary electric furnace 4. Figure 4 shows a graph of the mass fluctuation of the secondary electric furnace 4 (solid line) and the mass fluctuation of the unformed material 9 on the secondary conveyor 10b (dashed line) over a certain period during which the above-described control of the molten metal output from the secondary electric furnace 4 was performed. The mass fluctuation of the unformed material 9 has a certain fluctuation range, as indicated by the bar, and the center value is shown. The deviation ΔWP must be greater than half of this fluctuation range in order to reduce the controllability of the slide gate 4f of the secondary electric furnace 4. In other words, the slide gate 4f of the secondary electric furnace 4 maintains a constant opening until the deviation ΔWP is exceeded. Therefore, the molten metal output from the secondary electric furnace 4 is affected by the static pressure of the molten material 1b in the secondary electric furnace 4, i.e., the mass of the secondary electric furnace 4.

[0030] In this embodiment, as shown in Fig. 1, a slide gate 2f is installed at the tapping port of the primary electric furnace 2, and a control device 21 receives a signal from a mass detector 4e installed in the secondary electric furnace 4 and sends a predetermined opening signal to the slide gate 2f to control the amount of molten metal tapped from the primary electric furnace 2. A computer, a sequencer, or the like can be used as the control device 21. A load cell, or the like can be used as the mass detector 4e.

[0031] In the method for controlling the amount of molten metal discharged from a primary electric furnace according to this embodiment, the control device 21 controls the opening of the slide gate 2f installed at the tapping port of the primary electric furnace 2 according to the flow chart shown in Fig. 5 to maintain a constant volume of molten materials 1b in the secondary electric furnace 4. First, a target mass WE0 of the secondary electric furnace 2 is set (S50). For example, the target value can be set to about half the maximum volume of molten materials 1b in the secondary electric furnace 2.

[0032] Next, the mass WE of the secondary electric furnace 2 detected by the mass detector 4e installed in the secondary electric furnace 2 is compared with its target value WE0 (S51). If the deviation (|WE-WE0|), which is the absolute value of the difference between WE and WE0, is less than or equal to a predetermined deviation amount ΔWE (S51), the opening of the slide gate 2f of the primary electric furnace 2 is maintained as is, and the amount of molten metal tapped from the secondary electric furnace 4 is controlled (S56).

[0033] If the mass WE of the secondary electric furnace 2 exceeds the deviation ΔWE and falls below its target value WE0 (S51), a signal is sent to open the slide gate 2f of the primary electric furnace 2 to a predetermined maximum opening Gmax (S52). If the mass WE of the secondary electric furnace 2 exceeds the deviation ΔWE and falls below its target value WE0 (S51), a signal is sent to open the slide gate 2f of the primary electric furnace 2 to a predetermined minimum opening Gmin. The maximum opening Gmax is preferably set to an opening that provides a sufficient molten metal output from the secondary electric furnace 4 to the cotton mill 5 even when the static pressure in the primary electric furnace is at the minimum expected capacity of the molten raw materials 1b. The minimum opening Gmin is preferably set to an opening that provides a molten metal output that is less than the amount that the secondary electric furnace 4 can output to the cotton mill 5 when the static pressure in the primary electric furnace 2 is at the maximum expected capacity of the molten raw materials 1b. The maximum opening degree Gmax and the minimum opening degree Gmin may be determined by machine learning the behavior of mass fluctuations in the secondary electric furnace 2 and various operating conditions during rock wool production.

[0034] The amount of molten metal tapped from the primary electric furnace 2 to the secondary electric furnace 4 varies due to changes in the opening of the slide gate 2f installed at the tapping port of the primary electric furnace 2 and changes in the static pressure of the molten raw material 1b inside the primary electric furnace 2 (S54). The fluctuating mass WE of the secondary electric furnace 4 is detected by a mass detector 4e installed in the secondary electric furnace 4 (S55). This detection of the mass WE may be continuous, or the control device 21 may acquire it at predetermined time intervals.

[0035] Figure 6 shows the control status of the slide gate 2f installed at the tapping port of the primary electric furnace 2, controlled using the device configuration of Figure 1 and the flow of Figure 5, as well as the transition of mass fluctuations in the secondary electric furnace 4. In this embodiment, the mass deviation amount ΔWE of the secondary electric furnace 4 is set as the minimum detectable amount (measurement accuracy) of the mass detector 4f. By applying this embodiment, it can be seen that the secondary electric furnace 2 can be controlled to the target mass WE0. In the above example, we have explained the reduction of density variation in molded products, but we have confirmed that stabilizing the amount of molten metal tapped from the secondary electric furnace 2 to the cotton mill 5 also leads to a reduction in fiber diameter variation and a reduction in unfiberized raw material in the production of granular cotton.

[0036] When molten blast furnace slag is used as the main raw material 1, molten iron may accumulate in the primary electric furnace 2 or the secondary electric furnace 4. If the accumulated molten iron is mixed into the flow of molten iron from the secondary electric furnace 4 to the cotton mill 5, this undesirably leads to a decrease in yield and deterioration of fiber quality during cotton milling. Therefore, it is preferable to periodically discharge the accumulated molten iron from the molten iron drain holes provided at the bottom of the primary electric furnace 2 or the secondary electric furnace 4. [Example]

[0037] Using the rock wool manufacturing equipment shown in the above embodiment, the amount of molten blast furnace slag charged from the charging ladle 1a of the main raw material 1 was set to 6 to 10 tons, the capacity of the primary electric furnace 2 was set to approximately 40 tons, and the target mass WE0 of the secondary electric furnace 4 was set to 20.5 tons as the molten raw material 1b.

[0038] Figure 7 shows graphs showing the transition of mass fluctuation in the secondary electric furnace, where Figure 7(a) shows the case where the slide gate opening of the primary electric furnace according to this embodiment is automatically controlled, and Figure 7(b) shows the case where the slide gate opening of the primary electric furnace is manually controlled. As is clear from the figure, the standard deviation σ of mass fluctuation is reduced from 0.56 t with manual control to 0.04 t with automatic control, demonstrating that precise control is possible.

[0039] For example, 40 kg / m 3When manufacturing rock wool moldings with a density of 10 ... 3 The defect rate for the upper and lower density limits was reduced to 0.04% in total. In particular, the defect rate for the lower limit was reduced to 0.01%, so the target density was reduced to 0.5 kg / m 3 Even when set low, the deviation from the lower limit was only 0.04%, which contributed to improved productivity. [Industrial Applicability]

[0040] The rock wool manufacturing equipment and manufacturing method of the present invention arrange two electric furnaces in series and maintain a constant volume of molten raw material held in the secondary electric furnace. This minimizes changes in the static pressure applied to the tapping port from the secondary electric furnace to the cotton mill, making it possible to suppress fluctuations in the amount of molten raw material tapped into the cotton mill. This stabilizes the production volume of the cotton mill and enables the production of rock wool with little density deviation in the longitudinal direction of the molded product. By suppressing excessive density guarantees, productivity is also improved, making this industrially useful. [Explanation of symbols]

[0041] 100 Rock wool manufacturing equipment 1. Main raw material (blast furnace slag) 1a Charging pot 1b Molten raw materials 2 Primary electric furnace 2a electrode 2b Electric furnace cover 2c Surface coating material inlet 2d Gas Bubbling Lance 2e Main raw material input port 2F 1st slide gate 3 Auxiliary raw materials (component adjustment materials) 3a Auxiliary raw material cutting device 4 Secondary electric furnace 4a electrode 4b Electric furnace cover 4c Surface coating material input port 4d. Pouring port from primary electric furnace 4e First mass detector (load cell) 4th floor 2nd slide gate 5 Cotton spinner 6 wheels 7. Rock wool fiber 8 Cotton collection room 9 Unformed deposits 9a Rock wool moldings 10a Primary Conveyor 10b Secondary Conveyor 10c Pendulum 10d hardening furnace 10e cutting machine 10f Second mass detector (load cell) 11 Surface coating material feeding device 21 First control device 22 Second control device L Longitudinal direction

Claims

1. a primary electric furnace in which the main raw material is heated to a predetermined temperature, and a component adjuster is added to adjust the composition to a predetermined composition, thereby producing a molten raw material for rock wool; a first slide gate installed at the tapping port of the primary electric furnace and capable of controlling its opening degree; a secondary electric furnace for maintaining the molten raw material continuously supplied from the primary electric furnace at a predetermined temperature; a first mass detector for detecting a mass of the secondary electric furnace in which the molten raw material is held; a first control means for receiving a signal from the first mass detector and providing an opening signal to the first slide gate; The first control means is configured to give a signal to the first slide gate to open to a predetermined degree when the signal from the first mass detector exceeds a predetermined deviation amount from a predetermined mass, rock wool manufacturing equipment.

2. The rock wool manufacturing facility according to claim 1 , wherein the predetermined deviation amount is a multiple value of the minimum detection value of the first mass detector.

3. 3. The rock wool manufacturing equipment according to claim 1, wherein the first control means is configured to grasp the effect that the opening and closing operation of the first slide gate has on changes in the signal of the first mass detector and to change the opening signal given to the first slide gate.

4. a second slide gate that is installed at the tapping port of the secondary electric furnace and whose opening degree can be controlled; a cotton mill for fiberizing the molten raw material continuously supplied from the secondary electric furnace; a cotton collection chamber in which the fibers produced by the cotton mill are collected and turned into a plate-shaped unformed pile; a conveying device that folds the unformed pile and hardens it in a hardening furnace installed in the conveying path to form a plate-shaped molded product, and cuts it into a predetermined width and length; a second mass detector installed on the transport device; a second control means for receiving a signal from the second mass detector and providing a predetermined opening signal to the second slide gate; The rock wool manufacturing facility according to any one of claims 1 to 3, comprising:

5. In a rock wool manufacturing facility, two electric furnaces are arranged in series, and a first slide gate whose opening degree can be controlled is provided at the tapping port of the primary electric furnace, and a first mass detector that detects the mass of the secondary electric furnace is provided. When the mass of the secondary electric furnace exceeds a predetermined deviation from the target value, A method for manufacturing rock wool, wherein the opening degree of the first slide gate is changed to a predetermined value.

6. The method for manufacturing rock wool according to claim 5, wherein the predetermined deviation amount is set to a multiple value of the minimum detection value of the first mass detector.

7. The method for manufacturing rock wool according to claim 5 or 6, wherein the influence of the opening and closing operation of the slide gate on the change in the signal of the first mass detector is grasped and the opening range of the slide gate is changed.

8. Furthermore, the rock wool manufacturing equipment is provided with a second slide gate whose opening degree can be controlled at the tapping port of the secondary electric furnace, and a second mass detector that detects the mass of the unmolded product deposit, The method for producing rock wool according to any one of claims 5 to 7, wherein the opening degree of the second slide gate is adjusted so that the mass of the unformed product deposit falls within a predetermined range.

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