Preparation method of mineral wool board

Abstract

The invention provides a preparation method of a mineral wool board, and relates to the field of mineral wool acoustic board preparation, and the preparation method comprises the following steps: selecting glass fiber as a main raw material, preparing a proper amount of a flocculant and other additives, then cleaning, drying and cutting the glass fiber to obtain a glass fiber board; adding the treated glass fibers, a flocculating agent and other additives into a stirring device, adding a proper amount of water, stirring to form uniform mineral wool slurry, finally pouring the mineral wool slurry into a mold, and pressing and curing the mineral wool slurry. The glass fiber is used as a main raw material and a small-molecular-weight flocculant, so that the problems that an existing mineral wool board is generally prepared by adopting a wet forming method, attapulgite clay is generally used as an adhesive for preparing the mineral wool board, but the storage capacity of the attapulgite clay in the nature is limited, and the mineral wool board is not easy to be manufactured are solved. The prepared mineral wool board material is low in performance, and a traditional flocculant is too large in flocculation cluster diameter, so that the internal porosity of the mineral wool board is low.

Description

Technical Field

[0001] The invention relates to the field of preparation of mineral wool sound-absorbing panels, in particular to a method for preparing a mineral wool panel. Background Art

[0002] Mineral wool sound-absorbing panels have developed a mature production process and system that is suitable for the current production status. The mineral wool sound-absorbing panels produced using this technical system have excellent characteristics such as high-end appearance quality, excellent moisture-proof performance, and high strength. In addition, due to the irregular pressed holes on the surface, the overall sound absorption and noise reduction performance is improved.

[0003] In the prior art, CN109422484A discloses a low-moisture content mineral wool board and a preparation method thereof. The low-moisture content mineral wool board comprises granular wool, attapulgite clay, starch, aluminum sulfate and polyacrylamide. The method comprises a preparation process of sequentially adding polyacrylamide, starch, attapulgite clay, granular wool and aluminum sulfate into water, stirring, filtering, molding and drying.

[0004] The preparation method disclosed in the prior art CN109422484A has the following problems: 1. This type of mineral wool board is usually made by wet molding. In the present invention, the binder uses attapulgite clay to prepare the mineral wool board. However, the reserves of attapulgite clay in nature are limited, and the prepared mineral wool board material has low performance. Therefore, it is necessary to seek a new binder for mineral wool boards to replace attapulgite clay. 2. Due to the use of traditional flocculants, the diameter of the flocculants is too large, resulting in a low porosity inside the mineral wool board, which has a certain impact on the sound absorption performance of the mineral wool board itself. In addition, the noise reduction performance of the mineral wool board with this structure for low-frequency sound waves is not very outstanding, and it only has excellent sound absorption and noise reduction performance for high-frequency sound waves. Summary of the invention

[0005] The present invention provides a method for preparing a mineral wool board, which is used to solve at least one of the technical problems raised by the above background technology.

[0006] In order to solve the above technical problems, the present invention discloses a method for preparing a mineral wool board, comprising: Step 1: Select glass fiber as the main raw material and prepare appropriate amounts of binder, thickener, dispersant and flocculant; Step 2: Clean, dry and cut the glass fiber; Step 3: Add the treated glass fiber, binder, thickener, dispersant and flocculant into a stirring device, and add an appropriate amount of water for stirring to form a mineral wool slurry; Step 4: Pour the mineral wool slurry into the mold and press and solidify it.

[0007] Preferably, the flocculant in step 1 is a flocculant with a small molecular weight.

[0008] Preferably, in step 2, the fiber length is controlled within the range of 3-5 mm.

[0009] Preferably, in step three, the stirring speed is controlled at 500-800 rpm, and the stirring time is 30 min.

[0010] Preferably, during the compression molding in step 4, the compression pressure is 10 MPa, the holding time is 5 min, the curing temperature is 50° C., and the curing time is 24 h.

[0011] Preferably, the stirring device in step 3 comprises: A mixing box, a feed port is fixedly installed on the top left side of the mixing box, the bottom end of the feed port is connected with cavity one, a driving motor is fixedly installed in the mixing box, and the output shaft of the driving motor passes through cavity one and is fixedly connected with one end of rotating shaft one, and the other end of rotating shaft one passes through cavity one and is rotatably connected with the inner wall of the bottom end of cavity two, a plurality of stirring rods are fixedly installed on rotating shaft one located in cavity one, the rotating shaft one in cavity two is connected with two groups of stirring rods through a belt assembly, the bottom end of the stirring rod is rotatably connected to the inner wall of cavity two, and the top end of the stirring rod is arranged in cavity one, the right side of the bottom end of the mixing box is connected with one end of connecting pipe one, the other end of connecting pipe one is connected to a mineral wool slurry regulating device, and valve one is fixedly installed on connecting pipe one.

[0012] Preferably, the mineral wool slurry conditioning device comprises: The cam is connected to the top of the box body, and the top end of the cam is connected to the top of the box body, and the top of the cam is connected to the top of the cam, and the top of the cam is connected to the handle, and the cam is fixedly installed on the adjusting box, and the bottom end of the cam is movably connected to the push plate, and the push plate is slidably connected to the inner wall of the adjusting box, and one end of a long rod is fixedly installed on the bottom end of the push plate, and the other end of the long rod penetrates the box body and is fixedly connected to the piston, and the piston is slidably connected to the inner wall of the box body, and a pointer is also fixedly installed on the long rod in the adjusting box, and the right end of the pointer penetrates the through hole provided in the adjusting box, and the scale is fixedly installed on the top right side of the box body, and one end of the connecting pipe 2 is connected to the bottom right side of the box body, and the other end of the connecting pipe 2 is connected to the mold, and a valve 2 is fixedly installed on the connecting pipe 2.

[0013] Preferably, the method for preparing a mineral wool board further comprises testing the sound absorption and noise reduction performance of the mineral wool board, and the testing of the sound absorption and noise reduction performance of the mineral wool board comprises: Step 4: Sample preparation, select mineral wool board samples with sizes that meet the test requirements; Step 5: Fix the sample, fix the mineral wool board sample on the fixture; Step 6: Install detection equipment to capture the response of the mineral wool board to sound; Step 7: Data analysis and processing: record the data detected in step 3, process and analyze the sound data, and evaluate the acoustic performance of the mineral wool board.

[0014] Preferably, the detection equipment in step six includes: Sound pressure sensor 1, used to detect the sound pressure intensity before the sound passes through the mineral wool board; Sound pressure sensor 2, used to detect the sound pressure intensity after the sound passes through the mineral wool board; Wind speed sensor 1, used to detect the speed of air before it enters the mineral wool board; Wind speed sensor 2, used to detect the speed of air after it is discharged from the mineral wool board; A controller and an alarm, wherein the controller is electrically connected to the sound pressure sensor 1, the sound pressure sensor 2, the wind speed sensor 1, the wind speed sensor 2 and the alarm, and the controller controls the operation of the alarm based on the sound pressure sensor 1, the sound pressure sensor 2, the wind speed sensor 1 and the wind speed sensor 2.

[0015] Preferably, the data analysis and processing comprises the following steps: Step 1: Calculate the actual viscosity coefficient of air in the mineral wool board according to formula (1) and the detection values ​​of sound pressure sensor 1, sound pressure sensor 2, wind speed sensor 1, and wind speed sensor 2.

[0016]

[0017] in is the air density, is the mass flow rate of air, is the unit time, is the thickness of the mineral wool board, is the detection value of the sound pressure sensor, is the detection value of the second sound pressure sensor, is the length of the mineral wool board, is the detection value of wind speed sensor 1, is the correction factor for air at the end of the mineral wool board, is the width of the mineral wool board, is the detection value of wind speed sensor 2; Step 2: Calculate the relative acoustic impedance of the mineral wool board per unit area according to the following formula (2): , the controller compares the relative acoustic impedance of the mineral wool board per unit area When the actual acoustic impedance rate is not within the preset acoustic impedance rate range, the controller controls the alarm to sound:

[0018] in is the cross-sectional area of ​​the unit mineral wool board, is the propagation speed of air, is the perforated plate constant, is the sound absorption coefficient of the mineral wool board. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A flowchart provided for an embodiment of the present invention; Figure 2 A front view of the structure provided by an embodiment of the present invention; Figure 3 For the present invention Figure 1 Enlarged schematic diagram of the middle part of the device structure.

[0021] Reference numerals: 1. Mixing box; 2. Feed inlet; 3. Drive motor; 4. Rotating shaft 1; 5. Cavity 1; 6. Cavity 2; 7. Stirring rod; 8. Stirring rod; 9. Connecting pipe 1; 10. Valve 1; 11. Box 1; 12. Adjusting box; 13. Threaded rod; 14. Threaded sleeve; 15. Turntable; 16. Long rod; 17. Piston; 18. Pointer; 19. Through hole; 20. Scale; 21. Connecting pipe 2; 22. Valve 2; 23. Push plate; 24. Handle. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0024] The present invention provides the following embodiments Example 1 The present invention provides a method for preparing a mineral wool board. Figure 1 As shown, it includes: Step 1: Select glass fiber as the main raw material, and prepare appropriate amounts of binder, thickener, dispersant and flocculant (small molecular weight flocculant); Step 2: Clean, dry and cut the glass fiber; Step 3: Add the treated glass fiber, binder, thickener, dispersant and flocculant into a stirring device, and add an appropriate amount of water for stirring to form a uniform mineral wool slurry; Step 4: Pour the mineral wool slurry into the mold and press and solidify it.

[0025] Optionally, the flocculant in step 1 is a flocculant with a small molecular weight.

[0026] Optionally, in step 2, the fiber length is controlled within the range of 3-5 mm.

[0027] Optionally, in step three, the stirring speed is controlled at 500-800 rpm, and the stirring time is 30 min.

[0028] Optionally, during the compression molding in step 4, the compression pressure is 10 MPa, the holding time is 5 minutes, the curing temperature is 50° C., and the curing time is 24 hours.

[0029] The beneficial effects of the above technical solution are: The present invention changes the existing traditional mineral wool board preparation process to prepare a new mineral wool board substrate, replaces the traditional large molecular weight flocculant, and changes the original large molecular weight flocculant to a small molecular weight flocculant of the same type. In order not to change the other excellent properties of the mineral wool board, the flocculant type is not changed, and only its molecular weight is reduced. Thereby increasing the porosity of the mineral wool board, increasing the sensitivity of the mineral wool board to low-frequency sound waves, and improving the overall sound absorption performance; According to the invention, a mineral wool board with high sound absorption performance has high sensitivity to low-frequency sound waves, while maintaining sensitivity to high-frequency sound waves, and has high overall sound absorption and noise reduction performance, while maintaining the original high flexural strength, moisture resistance and other excellent performance. Therefore, the method for preparing the mineral wool board with high sound absorption performance is suitable for preparing mineral wool sound absorption boards; The present invention adds glass fiber as the main raw material in the stirring device because the glass fiber is an inorganic non-metallic material artificially manufactured rather than directly obtained from nature, and the glass fiber has good insulation, strong heat resistance, good corrosion resistance and high mechanical strength, thereby effectively improving the technical problem raised in the background technology: the existing mineral wool boards are usually made by wet molding, and attapulgite clay is usually used as a binder to prepare the mineral wool boards, but the reserves of attapulgite clay in nature are limited, and the performance of the prepared mineral wool board materials is relatively low.

[0030] Example 2 On the basis of Example 1, Figure 2-3 As shown, the stirring device in step three includes: A mixing box 1, wherein a feed port 2 is fixedly installed on the top left side of the mixing box 1, and the bottom end of the feed port 2 is connected to a cavity 5, a driving motor 3 is fixedly installed in the mixing box 1, and the output shaft of the driving motor 3 passes through the cavity 5 and is fixedly connected to one end of a rotating shaft 4, and the other end of the rotating shaft 4 passes through the cavity 5 and is rotatably connected to the inner wall of the bottom end of a cavity 6, a plurality of stirring rods 7 are fixedly installed on the rotating shaft 4 located in the cavity 5, the rotating shaft 4 in the cavity 6 is connected to two groups of stirring rods 8 through a belt assembly, the bottom ends of the stirring rods 8 are rotatably connected to the inner wall of the cavity 6, and the top ends of the stirring rods 8 are arranged in the cavity 5, the right side of the bottom end of the mixing box 1 is connected to one end of a connecting pipe 9, the other end of the connecting pipe 9 is connected to a mineral wool slurry regulating device, and a valve 10 is fixedly installed on the connecting pipe 9.

[0031] Optionally, the mineral wool slurry regulating device includes: a box body 11, the left end of the box body 11 is connected to the connecting pipe 9, and the top of the box body 11 is fixedly installed with an adjusting box 12, the top of the threaded rod 13 passes through the threaded sleeve 14 and is fixedly connected to the turntable 15, the top of the turntable 15 is connected to the handle 24, and the threaded sleeve 14 is fixedly installed on the adjusting box 12, the bottom end of the threaded rod 13 is movably connected to the push plate 23, the push plate 23 is slidably connected to the inner wall of the adjusting box 12, and the bottom end of the push plate 23 is fixedly installed with a long rod 16, the other end of the long rod 16 penetrates the box body 11 and is fixedly connected to the piston 17, the piston 17 is slidably connected to the inner wall of the box body 11 up and down, and a pointer 18 is also fixedly installed on the long rod 16 located in the regulating box 12, the right end of the pointer 18 penetrates the through hole 19 set in the regulating box 12, a scale 20 is fixedly installed on the top right side of the box body 11, one end of the connecting pipe 21 is connected to the bottom right side of the box body 11, the other end of the connecting pipe 21 is connected to the mold, and a valve 22 is fixedly installed on the connecting pipe 21.

[0032] The working principle of the above technical solution is as follows: when it is necessary to prepare the mineral wool board, firstly, the cleaned, dried and cut glass fibers and the prepared appropriate amount of binder, thickener, dispersant and flocculant are transported to the cavity 5 through the feed port 2, and then the drive motor 3 is started, and the drive motor 3 is started to drive the rotating shaft 4 to rotate, and the rotation of the rotating shaft 4 drives the stirring rod 8 connected to its belt to rotate, so that the glass fibers in the cavity 5 and the prepared appropriate amount of binder, thickener, dispersant and flocculant are effectively mixed. When they are fully mixed, the valve 10 is opened, so that the mineral wool slurry enters the box 11 through the connecting pipe 9. When the mineral wool slurry needs to be mixed, the valve 10 is opened to allow the mineral wool slurry to enter the box 11 through the connecting pipe 9. When adjusting the amount, the handle 24 is manually rotated, and the rotation of the handle 24 drives the turntable 15 to rotate, and the rotation of the turntable 15 drives the threaded rod 13 to rotate on the threaded sleeve 14 accordingly. The rotation of the threaded sleeve 14 drives the push plate 23 movably connected with it to move up and down, and further drives the long rod 16 to move up and down, drives the piston 17 to move up and down, and the long rod 16 moves up and down. The pointer 18 fixed on the long rod 16 moves up and down. The staff can observe the amount of mineral wool slurry entering the box body 11 according to the scale 20 on the right. When the adjustment is completed, open the valve 22 to allow the mineral wool slurry to enter the mold through the connecting pipe 21, and perform the next step of operation on it.

[0033] The beneficial effects of the above technical scheme are as follows: the present invention is conducive to fully stirring and mixing the mineral wool slurry in the cavity 5 by setting a plurality of stirring rods 7 and stirring rods 8; by setting a driving motor 3, it is conducive to achieving effective mixing and stirring through the rotation of the driving motor 3; by setting a valve 10 and a valve 2 22, it is conducive to achieving full stirring of the raw materials through electric control; by setting a pointer 18 and a scale 20, it is conducive to the staff to adjust the amount of mineral wool slurry in the box body 11 by observing the position of the pointer 18 on the scale 20, thereby controlling the amount of mineral wool slurry entering the mold, and further realizing the adjustment of the thickness of the mineral wool board during the pressing process; by setting a long rod 16 and a turntable 15, it is conducive to manually adjusting the piston 17 in the box body 11 up and down, thereby controlling the amount of mineral wool board entering the box body 11, which is very convenient and practical.

[0034] Example 3 The method for preparing a mineral wool board based on Example 1 or 2 further includes testing the sound absorption and noise reduction performance of the mineral wool board. The testing of the sound absorption and noise reduction performance of the mineral wool board includes: Step 4: Sample preparation, select mineral wool board samples with sizes that meet the test requirements; Step 5: Fix the sample, fix the mineral wool board sample on the fixture; Step 6: Install detection equipment to capture the response of the mineral wool board to sound; Step 7: Data analysis and processing: record the data detected in step 3, process and analyze the sound data, and evaluate the acoustic performance of the mineral wool board.

[0035] Optionally, the detection equipment in step six includes: Sound pressure sensor 1, used to detect the sound pressure intensity before the sound passes through the mineral wool board; Sound pressure sensor 2, used to detect the sound pressure intensity after the sound passes through the mineral wool board; Wind speed sensor 1, used to detect the speed of air before it enters the mineral wool board; Wind speed sensor 2, used to detect the speed of air after it is discharged from the mineral wool board; A controller and an alarm, wherein the controller is electrically connected to the sound pressure sensor 1, the sound pressure sensor 2, the wind speed sensor 1, the wind speed sensor 2 and the alarm, and the controller controls the operation of the alarm based on the sound pressure sensor 1, the sound pressure sensor 2, the wind speed sensor 1 and the wind speed sensor 2.

[0036] Optionally, the data analysis and processing includes the following steps: Step 1: According to formula (1), calculate the actual viscosity coefficient of air in the mineral wool board

[0037]

[0038] in is the air density, is the mass flow rate of air, is the unit time, is the thickness of the mineral wool board, is the detection value of the sound pressure sensor, is the detection value of the second sound pressure sensor, is the length of the mineral wool board, is the detection value of wind speed sensor 1, is the correction factor for air at the end of the mineral wool board (the range is 0.6-1.0), is the width of the mineral wool board, is the detection value of wind speed sensor 2; Step 2: Calculate the relative acoustic impedance of the mineral wool board per unit area according to the following formula (2): (refers to the ratio of the impedance presented by the mineral wool board material or structure to the propagation of sound waves to the air impedance). The controller compares the relative acoustic impedance rate of the mineral wool board per unit area. When the actual acoustic impedance rate is not within the preset acoustic impedance rate range, the controller controls the alarm to sound:

[0039] in is the cross-sectional area of ​​the unit mineral wool board, is the propagation speed of air, is the perforated plate constant (here refers to the mineral wool plate constant, the value range is 3-9), is the sound absorption coefficient of the mineral wool board (the value range is 0.7-1.0).

[0040] The beneficial effects of the above technical solution are as follows: first, according to formula (1) and the detection values ​​of the sound pressure sensor 1, the sound pressure sensor 2, the wind speed sensor 1 and the wind speed sensor 2, the actual viscosity coefficient of the air in the mineral wool board is calculated, and by comprehensively considering factors such as air density, air mass flow rate, unit time, thickness of the mineral wool board, length of the mineral wool board, correction coefficient of air at the end of the mineral wool board, width of the mineral wool board, etc., the calculation result is more accurate and reliable; Finally, according to formula (2), and taking into account the cross-sectional area of ​​the unit mineral wool board, the air propagation velocity, the perforated plate constant, and the sound absorption coefficient of the mineral wool board, the relative acoustic impedance rate of the unit area of ​​the mineral wool board is calculated, making the calculation result more accurate and reliable.

[0041] The controller controls the operation of the sound pressure sensor 1, the sound pressure sensor 2, the wind speed sensor 1, the wind speed sensor 2 and the alarm. When the relative acoustic impedance rate of the mineral wool board per unit area is not within the preset acoustic impedance rate range, the controller controls the alarm to sound an alarm, thereby reminding the user to check or replace the prepared mineral wool board in time, thereby improving the qualified rate of the prepared mineral wool board and further meeting the user's demand for the preparation method of this mineral wool board.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a mineral wool board, It is characterized in that include: Step 1: Select glass fiber as the main raw material and prepare appropriate amounts of binder, thickener, dispersant and flocculant; Step 2: Clean, dry and cut the glass fiber; Step 3: Add the treated glass fiber, binder, thickener, dispersant and flocculant into a stirring device, and add an appropriate amount of water for stirring to form a mineral wool slurry; Step 4: Pour the mineral wool slurry into the mold and press and solidify it.

2. A method for preparing a mineral wool board according to claim 1, It is characterized in that The flocculant is a flocculant with a small molecular weight.

3. A method for preparing a mineral wool board according to claim 1, It is characterized in that In the step 2, the fiber length is controlled within the range of 3-5 mm.

4. A method for preparing a mineral wool board according to claim 1, It is characterized in that In the step 3, the stirring speed is controlled at 500-800 rpm, and the stirring time is 30 min.

5. A method for preparing a mineral wool board according to claim 1, It is characterized in that During the pressing and molding in step 4, the pressing pressure is 10 MPa and the holding time is 5 minutes; the curing temperature is 50° C. and the curing time is 24 hours.

6. A method for preparing a mineral wool board according to claim 1, It is characterized in that The stirring device in step 3 comprises: A mixing box (1), wherein a feed port (2) is fixedly installed at the top left side of the mixing box (1), the bottom end of the feed port (2) is connected to the cavity one (5), a drive motor (3) is fixedly installed in the mixing box (1), and the output shaft of the drive motor (3) passes through the cavity one (5) and is fixedly connected to one end of the rotating shaft one (4), and the other end of the rotating shaft one (4) passes through the cavity one (5) and is rotatably connected to the inner wall of the bottom end of the cavity two (6), and is fixedly installed on the rotating shaft one (4) located in the cavity one (5). A plurality of stirring rods (7) are installed. The rotating shaft (4) in the cavity (6) is connected to two groups of stirring rods (8) through a belt assembly. The bottom ends of the stirring rods (8) are rotatably connected to the inner wall of the cavity (6), and the top ends of the stirring rods (8) are arranged in the cavity (5). The right side of the bottom end of the stirring box (1) is connected to one end of a connecting pipe (9), and the other end of the connecting pipe (9) is connected to a mineral wool slurry regulating device, and a valve (10) is fixedly installed on the connecting pipe (9).

7. A method for preparing a mineral wool board according to claim 6, It is characterized in that The mineral wool slurry conditioning device comprises: A box body (11), the left end of the box body (11) is connected to a connecting pipe (9), and an adjusting box (12) is fixedly installed on the top of the box body (11), the top of the threaded rod (13) passes through a threaded sleeve (14) and is fixedly connected to a turntable (15), the top of the turntable (15) is connected to a handle (24), and the threaded sleeve (14) is fixedly installed on the adjusting box (12), the bottom end of the threaded rod (13) is movably connected to a push plate (23), the push plate (23) is slidably connected to the inner wall of the adjusting box (12), and one end of a long rod (16) is fixedly installed on the bottom end of the push plate (23), and the long rod (16) is fixedly installed on the bottom end of the push plate (23). The other end of the rod (16) passes through the box body (11) and is fixedly connected to the piston (17). The piston (17) is slidably connected to the inner wall of the box body (11) up and down. A pointer (18) is also fixedly installed on the long rod (16) located in the regulating box (12). The right end of the pointer (18) passes through a through hole (19) provided in the regulating box (12). The scale (20) is fixedly installed on the top right side of the box body (11). One end of the connecting pipe (21) is connected to the bottom right side of the box body (11). The other end of the connecting pipe (21) is connected to the mold. A valve (22) is fixedly installed on the connecting pipe (21).

8. A method for preparing a mineral wool board according to claim 1, It is characterized in that It also includes the test of the sound absorption and noise reduction performance of the mineral wool board. The test of the sound absorption and noise reduction performance of the mineral wool board includes: Step 4: Sample preparation, select mineral wool board samples with sizes that meet the test requirements; Step 5: Fix the sample, fix the mineral wool board sample on the fixture; Step 6: Install detection equipment to capture the response of the mineral wool board to sound; Step 7: Data analysis and processing: record the data detected in step 3, process and analyze the sound data, and evaluate the acoustic performance of the mineral wool board.

9. A method for preparing a mineral wool board according to claim 8, It is characterized in that The detection equipment in step six includes: Sound pressure sensor 1, used to detect the sound pressure intensity before the sound passes through the mineral wool board; Sound pressure sensor 2, used to detect the sound pressure intensity after the sound passes through the mineral wool board; Wind speed sensor 1, used to detect the speed of air before it enters the mineral wool board; Wind speed sensor 2, used to detect the speed of air after it is discharged from the mineral wool board; A controller and an alarm, wherein the controller is electrically connected to the sound pressure sensor 1, the sound pressure sensor 2, the wind speed sensor 1, the wind speed sensor 2 and the alarm, and the controller controls the operation of the alarm based on the sound pressure sensor 1, the sound pressure sensor 2, the wind speed sensor 1 and the wind speed sensor 2.

10. A method for preparing a mineral wool board according to claim 8, It is characterized in that The data analysis and processing comprises the following steps: Step 1: Calculate the actual viscosity coefficient of air in the mineral wool board according to formula (1) and the detection values ​​of sound pressure sensor 1, sound pressure sensor 2, wind speed sensor 1, and wind speed sensor 2. in is the air density, is the mass flow rate of air, is the unit time, is the thickness of the mineral wool board, is the detection value of the sound pressure sensor, is the detection value of the second sound pressure sensor, is the length of the mineral wool board, is the detection value of wind speed sensor 1, is the correction factor for air at the end of the mineral wool board, is the width of the mineral wool board, is the detection value of wind speed sensor 2; Step 2: Calculate the relative acoustic impedance of the mineral wool board per unit area according to the following formula (2): , the controller compares the relative acoustic impedance of the mineral wool board per unit area When the actual acoustic impedance rate is not within the preset acoustic impedance rate range, the controller controls the alarm to sound: in is the cross-sectional area of ​​the unit mineral wool board, is the propagation speed of air, is the perforated plate constant, is the sound absorption coefficient of the mineral wool board.

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