A composite continuous felt spray production precision batching system

Abstract

This invention relates to the field of high-silica composite continuous felt technology, and particularly to a precision batching system for the spray production of composite continuous felt. The composite continuous felt of this invention has a multi-layered composite structure. The fiber intermediate layer can be used as a gradient buffer layer, effectively alleviating thermal stress and greatly improving the stability of the high-temperature resistant coating under rapid heating and cooling environments. Simultaneously, the fiber intermediate layer can also enhance thermal insulation performance. The raw material spray liquid for the high-temperature resistant coating of the composite continuous felt in this invention is precisely batched using a precision batching system. A solution compensation value ΔX is added during the batching process. ΔX is also the volume of solution continuing to flow out before the supply valve is completely closed. By prematurely terminating the nitrogen pressure drive, the system compensates for the extra liquid supply caused by the delayed closure of the supply valve, ensuring that the actual liquid supply strictly matches the target liquid supply volume X. 加 This will reduce errors to a lower level, ensure final accuracy, and avoid the situation where the fireproof and heat insulation effect of high silica-oxygen composite continuous felt is poor.

Description

Technical Field

[0001] This invention relates to the field of high-silica composite continuous felt technology, and in particular to a precision batching system for composite continuous felt spray production. Background Technology

[0002] High-silica continuous felt is an inorganic fiber material mainly composed of high-purity silicon dioxide. It has the characteristics of high temperature resistance, non-flammability, asbestos-free, and no harmful adhesives. This type of material is often used in high-temperature filtration, fireproofing and heat insulation and other scenarios.

[0003] High-silica composite continuous felt is a three-dimensional continuous fiber felt made of high-silica glass fiber as the base material and produced by processes such as needle punching, sewing or chemical bonding. It is combined with other high-temperature resistant materials to form a high-performance heat insulation, fireproof and filtration material, which is suitable for high-temperature industries and other fields with strict fire protection requirements.

[0004] Existing high-silica composite continuous felts are generally double-layered structures, which have poor thermal shock resistance and crack resistance. The high-temperature resistant coating on them is prone to cracking and peeling, and their function is limited. Their thermal insulation mainly relies on the high-temperature resistant coating, and their thermal insulation performance is limited.

[0005] Furthermore, the spraying solution for preparing the high-temperature resistant coating of high-silica composite continuous felt is usually prepared by mixing various spraying raw material liquids in precise proportions to ensure the performance of the coating spraying solution. However, in the actual preparation process, the raw materials in various storage tanks are generally loaded into separate metering containers, and then the liquids in each metering container are sent to a mixing tank for mixing. However, due to the different specific gravities of each chemical liquid, the different nitrogen pressurization methods, and the liquid levels in the metering containers, the liquid supply rate in each metering container will be affected. This will affect the accuracy of the coating spraying solution, resulting in low accuracy and errors in the coating spraying solution exceeding the allowable range of the process. This leads to poor subsequent coating effects, affecting the fireproof and heat insulation performance, and ultimately causing a decrease in product yield. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a precise batching system for composite continuous felt spraying production with good thermal shock resistance and crack resistance, better thermal insulation performance, and high precision in spray liquid preparation.

[0007] To solve the above-mentioned technical problems, the technical solution of the present invention is: a composite continuous felt spray production precision batching system, the innovation of which is: the composite continuous felt is a multi-layer composite structure, including a high silica glass fiber continuous felt base layer, a fiber intermediate layer and a high temperature resistant coating arranged sequentially from bottom to top; The high-temperature resistant coating is formed by applying a spray liquid to the surface of the fiber intermediate layer through a spraying process and then curing it. It includes 100 parts by weight of silicone resin, 20-40 parts of zirconium oxide sol, 1.5-3 parts of KH560 silane coupling agent, 50-150 parts of ethanol, 5-15 parts of layered double hydroxide, and 80-140 parts of low melting point glass powder. The spraying liquid is precisely proportioned using a precision batching system, which includes a mixing tank, multiple weighing scales, and multiple metering containers. Each metering container is connected to the mixing tank by a supply pipe, an inlet pipe, and a supply valve. Each metering container has a weighing scale at its bottom for quantitatively weighing one type of spraying liquid. Each metering container also contains a pressure sensor. The specific method for controlling the addition of one type of spraying liquid includes the following steps: S1. Supply liquid into a certain amount of tank until the liquid supply pipeline is full, then stop supplying liquid and close the supply valve. S2. Continue to supply liquid into the metering container until it is full, at which point the scale weighs X0. S3. Set the required liquid addition amount in the mixing tank to X. 加 The amount of solution added is ΔX, which is also the volume of solution that continues to flow out before the feed valve is completely closed. S4. Open the supply valve on the metering tank and use nitrogen pressure to push the solution in the metering tank into the mixing tank. The nitrogen pressure is P, the radius of the supply pipe is r, and the real-time weighing value of the scale during the supply process is X. T ; Where △X = (π×r) 2 ) × k ×√(2P / ρ) × t; k is the flow coefficient; ρ is the solution density; t is the time required for the feed valve to close completely; S5. Real-time calculation, when X T =X0+△XX 加 When the nitrogen pressure is stopped and the feeding valve is closed, the liquid supply to the mixing tank is stopped, and the precise liquid supply of this high-silica-oxygen spraying raw material liquid ends.

[0008] Furthermore, the precision batching system also includes a PLC controller, and all feeding valves, scales, and pressure sensors are electrically connected to the PLC controller.

[0009] Furthermore, the thickness of the high-temperature resistant coating is 0.01 mm to 0.5 mm.

[0010] Furthermore, the fiber intermediate layer also has a double-layer structure, with the layer closest to the high-temperature resistant coating made of ceramic fiber and the layer closest to the high-silica glass fiber continuous felt base layer made of chopped glass fiber. This allows for the optimal balance between performance and cost while controlling costs, as the ceramic fiber can withstand the high-temperature impact from the high-temperature resistant coating side.

[0011] Furthermore, each of the weighing scales in the precision batching system is set horizontally; Each metering bin is equipped with a weighing scale below it, and each metering bin is horizontally attached to the center of the top surface of the weighing scale. The bottom wall of the metering bin is an inclined surface, and the lower side of the inclined surface is the discharge side. A liquid outlet is also provided at the bottom of the side of the metering bin below the discharge side of the inclined surface, and a liquid outlet connector is provided at the liquid outlet. The mixing tank is positioned between multiple metering tanks and below the side near the liquid outlet. Multiple vertically arranged feeding pipes are installed at the top inlet of the mixing tank, and the top of each feeding pipe is higher than the inner bottom wall of the positioning tank. The top of each feed pipe on the mixing tank is connected to the outlet of each metering tank via an upwardly inclined liquid supply pipe.

[0012] Furthermore, each of the liquid supply pipes is filled with liquid before liquid addition, and a supply valve is installed between the liquid supply pipe and the adjacent liquid outlet connector.

[0013] The advantages of this invention are: 1. The composite continuous felt in this invention is a multi-layer composite structure, and the fiber intermediate layer set between the high silica glass fiber continuous felt base layer and the high temperature resistant coating can be used as a gradient buffer layer. Its thermal expansion coefficient is between that of the coating and the base layer, which effectively relieves thermal stress and greatly improves the stability of the high temperature resistant coating under rapid cooling and heating environment. At the same time, the fiber intermediate layer can also be used to improve the thermal insulation performance, thereby improving the thermal shock resistance, crack resistance and thermal insulation performance of the composite continuous felt.

[0014] 2. In this invention, the raw material spraying liquid for the high-temperature resistant coating of the composite continuous felt is precisely dispensed through a precision dispensing system. A solution compensation value ΔX is added during the dispensing process. ΔX is also the volume of solution continuing to flow out before the supply valve is fully closed. By prematurely terminating the nitrogen pressure drive, the extra liquid supply caused by the delayed closure of the supply valve is compensated, ensuring that the actual liquid supply strictly matches the target liquid addition volume X. 加 This will reduce errors to a lower level, ensure final accuracy, and avoid the situation where the fireproof and heat insulation effect of high silica-oxygen composite continuous felt is poor.

[0015] 3. This system achieves full automation and intelligence, requiring no manual intervention. It can automatically and accurately complete the high-precision batching of spray liquid, greatly reducing labor costs.

[0016] 4. The fiber intermediate layer also has a double-layer structure, with the layer closest to the high-temperature resistant coating made of ceramic fiber, and the layer closest to the high-silica glass fiber continuous felt base layer made of chopped glass fiber. This allows for cost control while the ceramic fiber can withstand the high-temperature impact from the high-temperature resistant coating side, achieving an optimal balance between performance and cost. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the composite structure of the composite continuous felt of the present invention.

[0018] Figure 2 This is a schematic diagram of the pre-mixing system of the present invention. Detailed Implementation

[0019] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0020] A high-precision spray liquid dispensing system for composite continuous felt spray production, such as... Figure 1 As shown, the composite continuous felt 01 is a multi-layer composite structure, including a high silica glass fiber continuous felt base layer 011, a fiber intermediate layer 012 and a high temperature resistant coating 013 arranged sequentially from bottom to top, and the high temperature resistant coating 013 is attached to the surface of the fiber intermediate layer 012; and the thickness of the high temperature resistant coating 013 is 0.01 mm to 0.5 mm.

[0021] This composite continuous felt 01 can be used to prepare aerospace heat-transparent insulation components, high-temperature flue gas filter bags, or thermal runaway protection layers for power batteries of new energy vehicles.

[0022] The fiber intermediate layer 012 also has a double-layer structure, with the layer closest to the high-temperature resistant coating 013 made of ceramic fiber, and the layer closest to the high-silica glass fiber continuous felt base layer 011 made of chopped glass fiber. This allows for cost control while the ceramic fiber can withstand the high-temperature impact on the high-temperature resistant coating 013 side, achieving an optimal balance between performance and cost.

[0023] The high-temperature resistant coating 013 is formed by applying a spray liquid to the surface of the fiber intermediate layer 012 through a spraying process and then curing it. It includes 100 parts by weight of silicone resin, 20-40 parts of zirconium oxide sol, 1.5-3 parts of KH560 silane coupling agent, 50-150 parts of ethanol, 5-15 parts of layered double hydroxide and 80-140 parts of low melting point glass powder. The spraying solution achieves precise proportions of various raw material liquids through a precision batching system, and the precision batching system, such as... Figure 2 As shown, it includes a PLC controller, four scales 1, four metering tanks 2, and a mixing tank 4. Each metering tank 2 is connected to the mixing tank 4 by a liquid supply pipe 8, a feed pipe 7, and a feed valve 9. Each metering tank 2 has a scale 1 at its bottom for quantitatively weighing a spraying raw material liquid. Each metering tank 1 is also equipped with a pressure sensor. In this embodiment, the four metering tanks 2 are symmetrically arranged on both sides of the mixing tank 4.

[0024] A weighing scale 1 is installed below each measuring bucket 2, and each measuring bucket 2 is horizontally and tightly installed at the center of the top surface of the weighing scale 1. A weighing sensor is installed at the center of the top of the weighing scale 1 below the measuring bucket. All weighing sensors are also electrically connected to the PLC controller. The weighing scale 1 and the weighing sensor are covered with a plastic sealing layer on the outside, and clean air is injected between the sealing layer and the weighing scale 1 to prevent the solution gas from corroding the weighing scale 1.

[0025] Since each scale 1 is located at the bottom of the metering container 2, and considering the issue of accuracy, it cannot be affected by the vibration of the metering container 2. Therefore, the entire bottom surface of the outer side of the metering container 2 is in close contact with the scale 1.

[0026] The metering container 2 includes a container body, and a solid filling area 21 is provided at the bottom inside the container body. The top surface of the solid filling area 21 is an inclined surface 22 that slopes downward to the right. The inclined surface 22 is the bottom wall inside the metering container 2, and the lower side of the inclined surface 22 is the discharge side, ensuring that there is no residue problem when the solution is discharged by gravity.

[0027] A liquid outlet 3 is provided on the bottom side of the metering tank 2, below the discharge side of the inclined surface 22, and a liquid outlet connector is provided at the liquid outlet 3.

[0028] An L-shaped discharge channel 5 is also provided on the solid filling area 21. The discharge channel 5 includes a vertical channel and a horizontal channel. The vertical channel is connected to the inside of the metering container 2, and the horizontal channel is connected to the outside of the metering container 2. The outlet of the horizontal channel is the liquid outlet 3.

[0029] The metering tank 2 is equipped with a level tube and a level sensor 6. The accuracy is ensured by the dual confirmation of the level tube and the level sensor 6.

[0030] The mixing tank 4 is positioned between the four metering tanks 2 and below the side near the outlet 3 of the metering tanks. Four vertically arranged feed pipes 7 are installed at the top inlet of the mixing tank 4. The angle between the centerline of the feed pipe 7 and the vertical plane is -3 to 3°, which can significantly reduce the risk of solution sticking to the wall. The top of the feed pipe 7 is higher than the highest point of the inner bottom wall of the positioning tank.

[0031] The liquid supply pipe 8 is inclined upward and set between the top of the feed pipe 7 and the liquid outlet 3; Each liquid supply pipe 8 is filled with liquid before liquid addition, and a supply valve 9 is installed between the liquid supply pipe 8 and the adjacent liquid outlet connector. In this embodiment, a self-operated nitrogen sealing valve 9 is used.

[0032] A sensor is also installed at the liquid outlet 3. In this embodiment, a conductivity sensor is used to detect whether there is solution being discharged from the liquid outlet 3.

[0033] An industrial electronic scale is also installed below the mixing tank 4, and a feeding port is also provided on the top of the mixing tank 4.

[0034] The top of the metering tank 2 is also equipped with a liquid inlet and an air inlet, and the air inlet is connected to a nitrogen compressor.

[0035] All feeding valves 9, scales 1, pressure sensors, conductivity sensors, and industrial electronic scales are electrically connected to the PLC controller.

[0036] In this embodiment, the four metering tanks 2 precisely add silicone resin, ethanol, KH560 silane coupling agent and zirconium oxide sol into the mixing tank.

[0037] One method for controlling the addition of a sprayed raw material liquid-silicone resin specifically includes the following steps: S1. Supply liquid into a certain amount of tank until the liquid supply pipeline is full, then stop supplying liquid and close the supply valve. S2. Continue to supply liquid into the metering container until it is full and then stop. At this time, the weighing scale weighs X0, and the weighing scale of the industrial electronic scale weighs D0. S3. Set the required liquid addition amount in the mixing tank to X. 加 The amount of solution added is ΔX, which is also the volume of solution that continues to flow out before the feed valve is completely closed. S4. Open the supply valve on the metering tank and use nitrogen pressure to push the solution in the metering tank into the mixing tank. The nitrogen pressure is P, the radius of the supply pipe is r, and the real-time weighing value of the scale during the supply process is X. T ; Where △X = (π×r) 2 ) × k ×√(2P / ρ) × t; k is the flow coefficient; ρ is the solution density; t is the time required for the feed valve to close completely; S5. Real-time calculation, when X T =X0+△XX 加When the nitrogen pressure is stopped and the feeding valve is closed, the liquid supply to the mixing tank is stopped. At this time, the industrial electronic scale weighs D1, and the precise supply of this type of spray raw material liquid ends.

[0038] △D=D1-D0, which is the weight of silicone resin received inside the mixing tank.

[0039] In the following examples, silicone resin is used as an example, with a density of 0.9-1.1 g / cm³. 3 Volume of liquid added X 加 It has a capacity of 50L.

[0040] Example 1:

[0041] Adding silicone resin to the mixing tank using one of the metering containers 2, the estimated specific steps of the liquid addition control method for the above-mentioned precision batching system are as follows: S1. Supply liquid into the metering tank until the liquid supply pipeline is full, then stop the liquid supply and close the supply valve. S2. Continue to supply liquid into the metering tank until it is full and then stop. At this time, the scale weighs X0, and the industrial electronic scale weighs D0. S3. Set the required liquid addition volume X in the mixing tank. 加 The solution volume is 50L, and the compensation volume is △X. △X is also the volume of solution that continues to flow out before the supply valve is completely closed. S4. Open the supply valve and use nitrogen pressure to push the solution in the metering tank towards the mixing tank. The input nitrogen pressure is P=0.5MPa, the inner radius of the supply pipe is r=30mm, and the real-time weighing value of the scale during the supply process is X. T ; k is the flow coefficient, and in this case, k = 0.8; ρ is the solution density, and ρ = 1.1 g / cm³. 3 Then X 加 The corresponding weight is 55kg; t is the time required for the feed valve to fully close. At this time, t = 0.05s, then ΔX = 3.41L; S5. Real-time calculation, when X T =X0+△XX 加 At this time, stop the nitrogen pressure and close the feed valve to stop the liquid supply to the mixing tank. The weighing value of the scale at this time is X. E At this point, the industrial electronic scale weighs D1, and the liquid supply operation ends.

[0042] The test showed that the weight ΔD of the silicone resin received inside the mixing tank was 54.887 kg.

[0043] Example 2:

[0044] In this embodiment, the radius of the liquid supply pipe is r=30mm, the flow coefficient is k=0.9, and the rest is the same as in embodiment 1, so ΔX =3.84L. The test showed that the weight ΔD of the silicone resin received inside the mixing tank was 54.878 kg.

[0045] Example 3:

[0046] In this embodiment, the input nitrogen pressure is P=0.8MPa, the radius of the liquid supply pipe is r=25mm, the flow coefficient is k=0.8, and the rest is the same as in Example 1, so ΔX =3.00L.

[0047] The test showed that the weight ΔD of the silicone resin received inside the mixing tank was 54.86 kg.

[0048] Example 4:

[0049] In this embodiment, the input nitrogen pressure is P=0.8MPa, the radius of the liquid supply pipe is r=25mm, the flow coefficient is k=0.9, and the rest is the same as in Example 1, so ΔX =3.37L.

[0050] The test showed that the weight ΔD of the silicone resin received inside the mixing tank was 54.847 kg.

[0051] Example 5:

[0052] This embodiment uses existing technology, and all conditions are the same as in Embodiment 1. Experiments show that the weight ΔD of the silicone resin received inside the mixing tank is 53.215 kg.

[0053] Example 6:

[0054] This embodiment uses existing technology, and all conditions are the same as in Example 3. Experiments show that the weight ΔD of the solution received inside the mixing tank is 52.723 kg.

[0055] The following table shows a comparison of Examples 1-6: In conclusion: Comparing Examples 1-6, it can be seen that the actual error of liquid addition using this method is far lower than that of existing technologies. Comparing Examples 1 and 3, and Examples 2 and 4, it can be seen that the actual error is smaller when the radius of the liquid supply pipe is larger during liquid addition using this method.

[0056] The high-temperature coating 013 of the composite continuous felt 01 is precisely dispensed using a precision dispensing system. In this system, a solution compensation value ΔX is added during the preparation of the high-silica coating spray solution. ΔX is also the volume of solution continuing to flow out before the supply valve is fully closed. By prematurely terminating the nitrogen pressure drive, the system compensates for the extra liquid supply caused by the delayed closure of the supply valve, ensuring that the actual liquid supply strictly matches the target liquid addition volume X. 加 This will reduce errors to a lower level, ensure final accuracy, and avoid the situation where the fireproof and heat insulation effect of high silica-oxygen composite continuous felt 01 is not good.

[0057] Meanwhile, this system is fully automated and intelligent, requiring no manual intervention. It can automatically and accurately complete the high-precision batching of spray liquid, greatly reducing labor costs.

[0058] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A precision batching system for composite continuous felt spray production, characterized in that: The composite continuous felt is a multi-layer composite structure, including a high-silica glass fiber continuous felt base layer, a fiber intermediate layer and a high-temperature resistant coating arranged sequentially from bottom to top. The high-temperature resistant coating is formed by applying a spray liquid to the surface of the fiber intermediate layer through a spraying process and then curing it. It includes 100 parts by weight of silicone resin, 20-40 parts of zirconium oxide sol, 1.5-3 parts of KH560 silane coupling agent, 50-150 parts of ethanol, 5-15 parts of layered double hydroxide, and 80-140 parts of low melting point glass powder. The spraying liquid is precisely proportioned using a precision batching system, which includes a mixing tank, multiple scales, and multiple metering containers. Each metering container is connected to the mixing tank by a supply pipe, an inlet pipe, and a supply valve. Each metering container is equipped with a scale at its bottom and a pressure sensor inside. The specific steps for controlling the addition of one type of spraying liquid include: S1. Supply liquid into a certain amount of tank until the liquid supply pipeline is full, then stop supplying liquid and close the supply valve. S2. Continue to supply liquid into the metering container until it is full, at which point the scale weighs X0. S3. Set the required liquid addition volume in the mixing tank to X. 加 The amount of solution added is ΔX, which is also the volume of solution that continues to flow out before the supply valve is completely closed. S4. Open the supply valve on the metering tank and use nitrogen pressure to push the solution in the metering tank into the mixing tank. The nitrogen pressure is P, the radius of the supply pipe is r, and the real-time weighing value of the scale during the supply process is X. T ; Where △X = (π×r) 2 ) × k ×√(2P / ρ) × t; Where k is the flow coefficient, ρ is the solution density, and t is the time required for the feed valve to close completely; S5. Real-time calculation, when X T =X0+△XX 加 When the nitrogen pressure is stopped and the feed valve is closed, the liquid supply to the mixing tank is stopped, and the precise supply of this type of spray raw material liquid ends.

2. The composite continuous felt spraying production precision batching system according to claim 1, characterized in that: The precision batching system also includes a PLC controller, and all feeding valves, scales, and pressure sensors are electrically connected to the PLC controller.

3. The composite continuous felt spraying production precision batching system according to claim 1, characterized in that: The thickness of the high-temperature resistant coating is 0.01 mm to 0.5 mm.

4. The composite continuous felt spraying production precision batching system according to claim 1, characterized in that: The fiber intermediate layer is also a double-layer structure, with the layer near the high-temperature resistant coating made of ceramic fiber and the layer near the high-silica glass fiber continuous felt base layer made of chopped glass fiber.

5. The composite continuous felt spraying production precision batching system according to claim 1, characterized in that: The high-temperature resistant coating comprises 100 parts by weight of silicone resin, 20-40 parts by weight of zirconium oxide sol, 1.5-3 parts by weight of KH560 silane coupling agent, 50-150 parts by weight of ethanol, 5-15 parts by weight of layered double hydroxide, and 80-140 parts by weight of low-melting-point glass powder.

6. The precision batching system for composite continuous felt spraying production according to claim 1, characterized in that: Each of the weighing scales in the precision batching system is set horizontally. Each metering bin is equipped with a weighing scale below it, and each metering bin is horizontally attached to the center of the top surface of the weighing scale. The bottom wall of the metering bin is an inclined surface, and the lower side of the inclined surface is the discharge side. A liquid outlet is also provided at the bottom of the side of the metering bin below the discharge side of the inclined surface, and a liquid outlet connector is provided at the liquid outlet. The mixing tank is positioned between multiple metering tanks and below the side near the liquid outlet. Multiple vertically arranged feeding pipes are installed at the top inlet of the mixing tank, and the top of each feeding pipe is higher than the inner bottom wall of the positioning tank. The top of each feed pipe on the mixing tank is connected to the outlet of each metering tank via an upwardly inclined liquid supply pipe.

7. The composite continuous felt spraying production precision batching system according to claim 6, characterized in that: Each of the liquid supply pipes is filled with liquid before liquid addition, and a supply valve is also installed between the liquid supply pipe and the adjacent liquid outlet connector.

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