Control system and control method for continuous and accurate dipping of flame retardant for flame-retardant plywood

Abstract

The invention discloses a control system and a control method for continuous and accurate impregnation of a flame retardant for flame-retardant plywood, the control system comprises an impregnation tank, a liquid storage pool, a charging machine, a liquid pumping assembly, a first concentration detection assembly, a backflow assembly, a second concentration detection assembly and a PLC controller, the impregnation tank is equipped with a vacuum meter and a pressure meter, the vacuum meter and the pressure meter are connected with the PLC controller, and the PLC controller is connected with the liquid storage pool. The first concentration detection assembly and the second concentration detection assembly are connected with the PLC, the PLC is connected with the feeding machine, the liquid pumping assembly and the backflow assembly, and the control method comprises the steps that the first concentration detection probe detects the concentration of the flame-retardant liquid in the liquid storage tank, and the feeding machine and the stirring device are closed when the concentration of the flame-retardant liquid meets the requirement; the second concentration detection probe detects the concentration of the flame-retardant liquid in the impregnation tank, and the booster pump is closed when the concentration of the flame-retardant liquid meets the requirement, so that the concentration of the flame-retardant liquid in the liquid storage tank and the impregnation tank is automatically detected and adjusted, and the plywood can be subjected to uniform and sufficient flame-retardant treatment in the whole impregnation process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fire-retardant plywood impregnation, in particular to a fire-retardant plywood continuous and precise impregnation control system and method. BACKGROUND

[0002] To improve the fireproof performance of plywood, meet the increasingly stringent fire safety standards and the requirements of material flame retardancy in different application scenarios, flame retardant treatment becomes a key link in the production process of fire-retardant plywood, and the single board impregnation flame retardant process, as a common and effective flame retardant treatment method, is widely used in the production field of fire-retardant plywood.

[0003] The process impregnates wood veneer in flame-retardant liquid, so that the flame retardant fully penetrates into the veneer, and then the impregnated wood veneer is dried, glued and hot-pressed into plywood, giving the plywood good flame-retardant properties. However, the current impregnation process relies on manual operation, and due to the randomness and instability of manual operation, it is difficult to ensure that the impregnation process parameters of each batch of wood veneer are completely consistent, thereby affecting the stability and consistency of product quality. In addition, during the impregnation process, as the wood veneer continuously absorbs the effective components in the flame-retardant liquid, the concentration of the flame-retardant liquid in the impregnation tank will gradually decrease, and the existing process lacks effective concentration monitoring and control means, and cannot adjust the impregnation parameters in a timely manner according to the change of the concentration of the flame-retardant liquid, which leads to a gradual deterioration of the impregnation effect with the passage of time, and makes it difficult to ensure that the plywood can obtain uniform and sufficient flame-retardant treatment throughout the impregnation process. In addition, a complete production process takes about 5-6 hours, and long-term impregnation not only increases energy consumption and production cycle, but also further amplifies the adverse effects of changes in the concentration of the flame-retardant liquid on the impregnation effect, making it difficult for the flame-retardant performance of the plywood to reach an ideal state. SUMMARY

[0004] In order to overcome the deficiencies of the prior art, the present application provides a fire-retardant plywood continuous and precise impregnation control system and method, which can effectively solve the technical problems raised in the background art.

[0005] The technical solution adopted by the present application to solve its technical problems is: a fire-retardant plywood continuous and precise impregnation control system, comprising an impregnation tank, a liquid storage pool, a feeder, a liquid pumping assembly, a first concentration detection assembly, a reflux assembly, a second concentration detection assembly and a PLC controller.

[0006] The liquid storage tank is used for storing the fire-retardant liquid, the liquid feeding machine is used for conveying the fire-retardant agent to the inside of the liquid storage tank to increase the concentration of the fire-retardant liquid, the liquid pumping assembly is respectively connected with the liquid storage tank and the immersion tank and is used for conveying the fire-retardant liquid in the inside of the liquid storage tank to the inside of the immersion tank, the liquid returning assembly is respectively connected with the liquid storage tank and the immersion tank and is used for conveying the fire-retardant liquid in the inside of the immersion tank to the inside of the liquid storage tank, the first concentration detecting assembly is used for detecting the concentration of the fire-retardant liquid in the inside of the liquid storage tank, and the second concentration detecting assembly is used for detecting the concentration of the fire-retardant liquid in the inside of the immersion tank.

[0007] The immersion tank is provided with a vacuum gauge and a pressure gauge, the vacuum gauge is used for detecting the negative pressure value of the immersion tank, the pressure gauge is used for detecting the pressure value of the immersion tank, the vacuum gauge and the pressure gauge are in communication connection with the PLC controller, the first concentration detecting assembly and the second concentration detecting assembly are respectively in electrical connection with the PLC controller, and the PLC controller is respectively in control connection with the liquid feeding machine, the liquid pumping assembly and the liquid returning assembly.

[0008] Further, the liquid feeding machine is connected with the liquid storage tank through a feeding pipeline, the inside of the liquid storage tank is provided with a stirring device, the PLC controller is in control connection with the stirring device, and the stirring device is used for stirring the fire-retardant liquid to make the fire-retardant agent and the fire-retardant liquid fully mix to increase the concentration of the fire-retardant liquid.

[0009] Further, the liquid pumping assembly comprises a vacuum pumping module, a vacuum pipeline and at least one liquid inlet pipeline, one end of the vacuum pipeline is connected with the vacuum pumping module, the other end is connected with the inside space of the immersion tank, one end of the liquid inlet pipeline is connected with the inside space of the immersion tank, the other end is connected with the inside space of the liquid storage tank, each liquid inlet pipeline is connected with a flow control valve in series, and the vacuum pumping module is used for forming a vacuum negative pressure environment in the inside of the immersion tank to make the fire-retardant liquid in the inside of the liquid storage tank flow into the inside of the immersion tank under the action of a pressure difference.

[0010] Further, the vacuum pumping module comprises at least two vacuum pumps, the two vacuum pumps are connected with the vacuum pipeline in series, and the vacuum pipeline is connected with a vacuum electric valve in series.

[0011] Further, the liquid pumping assembly further comprises a pressurizing liquid inlet pipeline and a pressurizing pump, one end of the pressurizing liquid inlet pipeline is connected with the inside space of the immersion tank, the other end is connected with the inside space of the liquid storage tank, the pressurizing pump is connected with the pressurizing liquid inlet pipeline in series, and the pressurizing pump makes the fire-retardant liquid in the inside of the liquid storage tank flow into the inside of the immersion tank through the pressurizing liquid inlet pipeline.

[0012] Further, the first concentration detection component comprises a first sampling pipeline, a first sampling box and a first concentration detection probe, the first sampling pipeline is communicated with the internal space of the liquid pool, so that the fire-retardant liquid in the internal space of the liquid pool flows into the internal space of the first sampling box through the first sampling pipeline, and the first concentration detection probe is arranged in the internal space of the first sampling box and used for detecting the concentration of the fire-retardant liquid flowing into the first sampling box.

[0013] Further, the backflow component comprises a backflow pipeline and a backflow sampling pump, one end of the backflow pipeline is communicated with the internal space of the immersion tank, the other end of the backflow pipeline is communicated with the internal space of the liquid pool, and a backflow electric valve is connected in series to the backflow pipeline, and the backflow sampling pump is connected in series to the backflow pipeline, so that the fire-retardant liquid in the internal space of the immersion tank flows into the internal space of the liquid pool through the backflow pipeline.

[0014] Further, the second concentration detection component comprises a second sampling pipeline, a second sampling box and a second concentration detection probe, one end of the second sampling pipeline is communicated with the backflow pipeline, and a sampling electric valve is connected in series to the second sampling pipeline, so that the fire-retardant liquid in the internal space of the immersion tank flows into the second sampling pipeline through the backflow pipeline, and then flows into the internal space of the second sampling box, and the second concentration detection probe is arranged in the internal space of the second sampling box and used for detecting the concentration of the fire-retardant liquid flowing into the second sampling box.

[0015] The control method of the continuous and accurate immersion control system for fire-retardant agent of the fire-retardant plywood comprises the following steps:

[0016] In step S1, the first concentration detection probe is used to detect the concentration of the fire-retardant liquid in the internal space of the liquid pool, and the PLC controller adjusts the working states of the feeding machine and the stirring device after obtaining the concentration parameter, and the feeding machine and the stirring device are closed when the concentration of the fire-retardant liquid meets the requirements.

[0017] In step S2, the PLC controller starts the vacuum pumping module and forms a vacuum negative pressure environment in the internal space of the immersion tank, the vacuum table detects the negative pressure value of the immersion tank, and the PLC controller adjusts the working states of the vacuum pumping module and the vacuum electric valve after obtaining the negative pressure value, and the vacuum pumping module and the vacuum electric valve are closed when the negative pressure value of the immersion tank is greater than 0.7 Pa.

[0018] In step S3, the PLC controller starts the flow control valve, so that the fire-retardant liquid in the internal space of the liquid pool flows into the internal space of the immersion tank under the action of the pressure difference, and the flow control valve is closed when the immersion tank is filled with the fire-retardant liquid.

[0019] In step S4, the PLC controller starts the booster pump, the pressure table detects the pressure value of the immersion tank, and the PLC controller adjusts the working state of the booster pump after obtaining the pressure value, and the booster pump is stopped when the pressure value of the immersion tank is greater than 12 Pa.

[0020] In step S5, the immersion is performed for 9-11 minutes.

[0021] Step S6, the PLC controller starts the sampling electric valve, the backflow sampling pump and the backflow electric valve, so that the fire-retardant liquid in the impregnation tank flows into the second sampling pipeline through the backflow pipeline, and then flows into the second sampling box, the second concentration detection probe detects the concentration of the fire-retardant liquid in the impregnation tank, the PLC controller adjusts the working state of the booster pump after obtaining the concentration parameter, and the booster pump, the sampling electric valve, the backflow sampling pump and the backflow electric valve are closed when the concentration of the fire-retardant liquid in the impregnation tank meets the requirements;

[0022] Step S7, standing for 9-11 minutes for impregnation;

[0023] Step S8, when the production setting time is reached, the PLC controller starts the backflow sampling pump and the backflow electric valve, so that the fire-retardant liquid in the impregnation tank flows into the inside of the liquid storage pool through the backflow pipeline.

[0024] Compared with the prior art, the present application has the following advantages:

[0025] The first concentration detection probe is used to detect the concentration of the fire-retardant liquid in the liquid storage pool, the PLC controller adjusts the working state of the feeder and the stirring device after obtaining the concentration parameter, and the feeder and the stirring device are closed when the concentration of the fire-retardant liquid meets the requirements, and the concentration of the fire-retardant liquid in the liquid storage pool is automatically detected and adjusted every other setting time;

[0026] The PLC controller starts the sampling electric valve, the backflow sampling pump and the backflow electric valve, so that the fire-retardant liquid in the impregnation tank flows into the second sampling pipeline through the backflow pipeline, and then flows into the second sampling box, the second concentration detection probe detects the concentration of the fire-retardant liquid in the impregnation tank, the PLC controller adjusts the working state of the booster pump after obtaining the concentration parameter, and the booster pump, the sampling electric valve, the backflow sampling pump and the backflow electric valve are closed when the concentration of the fire-retardant liquid in the impregnation tank meets the requirements, and the concentration of the fire-retardant liquid in the impregnation tank is automatically adjusted every other setting time, so that the plywood can be uniformly and sufficiently treated with fire-retardant during the whole impregnation process. BRIEF DESCRIPTION OF DRAWINGS

[0027] Fig. 1 It is a structural diagram of the continuous and precise impregnation control system for fire-retardant plywood fire-retardant agent.

[0028] Fig. 2 It is a module connection diagram of the PLC controller.

[0029] Fig. 3 It is a flow chart of the control method of the continuous and precise impregnation control system for fire-retardant plywood fire-retardant agent.

[0030] Reference numerals in the drawings:

[0031] 1, impregnation tank; 2, pressure gauge; 3, vacuum gauge; 4, vacuum pump; 5, vacuum electric valve; 6, vacuum pipeline; 7, sampling electric valve; 8, reflux pipeline; 9, reflux electric valve; 10, reflux sampling pump; 11, second sampling pipeline; 12, second sampling box; 13, second concentration detection probe; 14, first sampling box; 15, first concentration detection probe; 16, first sampling pipeline; 17, stirring device; 18, liquid storage tank; 19, feeder; 20, booster pump; 21, flow control valve; 22, liquid inlet pipeline; 23, booster liquid inlet pipeline. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0033] As shown in the drawings, Figs. 1-3 The present application provides a continuous and precise impregnation control system for fire-retardant plywood fire retardant, which comprises an impregnation tank 1, a liquid storage tank 18, a feeder 19, a liquid pumping assembly, a first concentration detection assembly, a reflux assembly, a second concentration detection assembly, and a PLC controller. The liquid storage tank 18 is used to store fire-retardant liquid, and the feeder 19 is used to deliver fire retardant into the liquid storage tank 18 to increase the concentration of the fire-retardant liquid. The liquid pumping assembly is in communication with the liquid storage tank 18 and the impregnation tank 1, respectively, and is used to deliver the fire-retardant liquid in the liquid storage tank 18 into the impregnation tank 1. The reflux assembly is in communication with the liquid storage tank 18 and the impregnation tank 1, respectively, and is used to deliver the fire-retardant liquid in the impregnation tank 1 into the liquid storage tank 18. The first concentration detection assembly is used to detect the concentration of the fire-retardant liquid in the liquid storage tank 18, and the second concentration detection assembly is used to detect the concentration of the fire-retardant liquid in the impregnation tank 1.

[0034] The impregnation tank 1 is equipped with a vacuum gauge 3 and a pressure gauge 2. The vacuum gauge 3 is used to detect the negative pressure value of the impregnation tank 1, and the pressure gauge 2 is used to detect the pressure value of the impregnation tank 1. The vacuum gauge 3 and the pressure gauge 2 are in communication connection with the PLC controller. The first concentration detection assembly and the second concentration detection assembly are respectively in electrical connection with the PLC controller, and the PLC controller is respectively in control connection with the feeder 19, the liquid pumping assembly, and the reflux assembly.

[0035] The intermediate gateway module, the cloud platform and the multi-terminal application software are further included, the PLC controller is connected with the intermediate gateway module, the intermediate gateway module is connected with the cloud platform, the multi-terminal application software is connected with the cloud platform, the PLC controller is responsible for executing the automation control task, the intermediate gateway module serves as a bridge between the PLC and the cloud platform, the cloud platform provides data storage, processing and analysis services, and the multi-terminal application software includes computer software and mobile phone APP, and supports parameter setting, real-time monitoring and data analysis functions.

[0036] The feeding machine 19 is connected with the liquid storage pool 18 through a feeding pipeline, and the liquid storage pool 18 is internally provided with a stirring device 17, and a PLC controller is connected with the stirring device 17 for control, and the stirring device 17 is used for stirring the fire-retardant liquid to make the fire retardant and the fire-retardant liquid fully mixed to improve the concentration of the fire-retardant liquid.

[0037] The liquid pumping assembly comprises a vacuum pumping module, a vacuum pipeline 6 and at least one liquid inlet pipeline 22, one end of the vacuum pipeline 6 is connected with the vacuum pumping module, the other end is connected with the internal space of the impregnation tank 1, preferably, the vacuum pumping module comprises at least two vacuum pumps 4, the two vacuum pumps 4 are connected in series with the vacuum pipeline 6, the vacuum pipeline 6 is connected in series with a vacuum electric valve 5, one end of the liquid inlet pipeline 22 is connected with the internal space of the impregnation tank 1, the other end is connected with the internal space of the liquid storage pool 18, each liquid inlet pipeline 22 is connected in series with a flow control valve 21, the vacuum pumping module is used for forming a vacuum negative pressure environment in the impregnation tank 1, so that the fire-retardant liquid in the liquid storage pool 18 flows into the impregnation tank 1 through the liquid inlet pipeline 22 under the action of the pressure difference, the liquid pumping assembly further comprises a pressurized liquid inlet pipeline 23 and a pressurized pump 20, one end of the pressurized liquid inlet pipeline 23 is connected with the internal space of the impregnation tank 1, the other end is connected with the internal space of the liquid storage pool 18, the pressurized pump 20 is connected in series on the pressurized liquid inlet pipeline 23, and the pressurized pump 20 makes the fire-retardant liquid in the liquid storage pool 18 flow into the impregnation tank 1 through the pressurized liquid inlet pipeline 23;

[0038] The first concentration detection assembly comprises a first sampling pipeline 16, a first sampling box 14 and a first concentration detection probe 15, the first sampling pipeline 16 is connected with the internal space of the liquid storage pool 18, so that the fire-retardant liquid in the liquid storage pool 18 flows into the first sampling box 14 through the first sampling pipeline 16, the first concentration detection probe 15 is arranged in the first sampling box 14 and is used for detecting the concentration of the fire-retardant liquid flowing into the first sampling box 14;

[0039] The reflux assembly includes a reflux pipe 8 and a reflux sampling pump 10. One end of the reflux pipe 8 is connected to the internal space of the impregnation tank 1, and the other end is connected to the internal space of the storage tank 18. Furthermore, a reflux electric valve 9 is connected in series with the reflux pipe 8. The reflux sampling pump 10 is connected in series with the reflux pipe 8. The reflux sampling pump 10 causes the flame retardant liquid inside the impregnation tank 1 to flow into the interior of the storage tank 18 through the reflux pipe 8.

[0040] The second concentration detection component includes a second sampling pipe 11, a second sampling box 12, and a second concentration detection probe 13. One end of the second sampling pipe 11 is connected to the return pipe 8. The second sampling pipe 11 is connected in series with a sampling electric valve 7. The return sampling pump 10 causes the flame retardant liquid inside the impregnation tank 1 to flow into the second sampling pipe 11 through the return pipe, and then into the second sampling box 12 from the second sampling pipe 11. The second concentration detection probe 13 is installed inside the second sampling box 12 and is used to detect the concentration of the flame retardant liquid flowing into the second sampling box 12.

[0041] The vacuum pump 4, reflux sampling pump 10, booster pump 20 and stirring device 17 are each connected to at least one frequency converter. The PLC controller is communicatively connected to multiple frequency converters to control the operating parameters of the vacuum pump 4, reflux sampling pump 10, booster pump 20 and stirring device 17. Furthermore, the PLC controller is communicatively connected to the vacuum electric valve 5, reflux electric valve 9, sampling electric valve 7 and flow control valve 21 to control the opening and closing of the vacuum electric valve 5, reflux electric valve 9, sampling electric valve 7 and flow control valve 21.

[0042] The concentration of flame retardant in the impregnation tank 1 is maintained within 11-11.2% ± 0.2%. The detection accuracy of the first concentration detection probe 15 and the second concentration detection probe 13 is 0.005 mol / L. The actual control accuracy of the device can reach < ± 0.02 mol / L. The concentration detection time interval is once every 5 minutes.

[0043] The control method for the continuous and precise impregnation control system of flame retardant for flame-retardant plywood includes the following steps:

[0044] Step S1: The concentration of flame retardant liquid inside the storage tank 18 is detected by the first concentration detection probe 15. After the PLC controller obtains the concentration parameters, it adjusts the working status of the feeder 19 and the stirring device 17. When the concentration of flame retardant liquid reaches 11-11.2%, the feeder 19 and the stirring device 17 are turned off.

[0045] Step S2: The PLC controller starts the vacuum module and creates a vacuum negative pressure environment inside the impregnation tank 1. The vacuum gauge 3 detects the negative pressure value of the impregnation tank 1. After the PLC controller obtains the negative pressure value, it adjusts the working state of the vacuum module and the vacuum electric valve 5. When the negative pressure value of the impregnation tank 1 is greater than 0.7 Pa, the vacuum module and the vacuum electric valve 5 are closed.

[0046] Step S3, the PLC controller starts the flow control valve 21 to make the fire -retardant liquid in the storage pool 18 under the action of pressure difference into the inside of the immersion tank 1 through the liquid inlet pipe 22, and closes the flow control valve 21 when the fire -retardant liquid fills the immersion tank 1;

[0047] Step S4, the PLC controller starts the booster pump 20, the pressure gauge 2 detects the pressure value of the immersion tank 1, and the PLC controller adjusts the working state of the booster pump 20 after obtaining the pressure value, and stops the booster pump 20 when the pressure value of the immersion tank 1 is greater than 12 Pa;

[0048] Step S5, standing for 9-11 minutes of immersion;

[0049] Step S6, the PLC controller starts the sampling electric valve 7, the backflow sampling pump 10 and the backflow electric valve 9, so that the fire -retardant liquid in the immersion tank 1 flows into the second sampling pipe 11 through the backflow pipe, and flows into the second sampling box 12 from the second sampling pipe 11, the second concentration detection probe 13 detects the concentration of the fire -retardant liquid in the immersion tank 1, the PLC controller adjusts the working state of the booster pump 20 after obtaining the concentration parameter, and closes the booster pump 20, the sampling electric valve 7, the backflow sampling pump 10 and the backflow electric valve 9 when the concentration of the fire -retardant liquid in the immersion tank 1 reaches 11-11.2%;

[0050] Step S7, standing for 9-11 minutes of immersion;

[0051] Step S8, reaching the production setting time, the PLC controller starts the backflow sampling pump 10 and the backflow electric valve 9, so that the fire -retardant liquid in the immersion tank 1 flows into the inside of the storage pool 18 through the backflow pipe 8.

[0052] Compared with the traditional technology:

[0053] The first concentration detection probe 15 is used to detect the concentration of the fire -retardant liquid in the storage pool 18, the PLC controller adjusts the working state of the feeder 19 and the stirring device 17 after obtaining the concentration parameter, and closes the feeder 19 and the stirring device 17 when the concentration of the fire -retardant liquid meets the requirements, and realizes automatic detection and adjustment of the concentration of the fire -retardant liquid in the storage pool 18 every other setting time;

[0054] The PLC controller starts the sampling electric valve 7, the backflow sampling pump 10 and the backflow electric valve 9, so that the fire-retardant liquid in the impregnation tank 1 flows into the second sampling pipeline 11 through the backflow pipeline, and then flows into the second sampling box 12, the second concentration detection probe 13 detects the concentration of the fire-retardant liquid in the impregnation tank 1, the PLC controller adjusts the working state of the booster pump 20 after obtaining the concentration parameter, and when the concentration of the fire-retardant liquid in the impregnation tank 1 meets the requirements, the booster pump 20, the sampling electric valve 7, the backflow sampling pump 10 and the backflow electric valve 9 are closed, so that the concentration of the fire-retardant liquid in the impregnation tank 1 is automatically detected and adjusted every other set time, so that the plywood can be uniformly and sufficiently treated with fire retardant during the whole impregnation process.

[0055] It will be obvious to a person skilled in the art that the application is not limited to the details of the above-described exemplary embodiments but can be implemented in other embodiments without departing from the scope of the application. The embodiments are to be considered in all respects as being illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the description above, and therefore all changes which come within the meaning and range of equivalency of the claims are to be embraced by the application. Any reference signs in the claims should not be construed as limiting the claims concerned.

Claims

1. A continuous and precise impregnation control system for flame-retardant plywood, characterized in that, It includes an impregnation tank, a storage tank, a feeder, a liquid extraction assembly, a first concentration detection assembly, a reflux assembly, a second concentration detection assembly, and a PLC controller; The system includes a storage tank for storing flame retardant liquid, a feeder for conveying flame retardant into the storage tank to increase the concentration of the flame retardant liquid, a pumping assembly connected to both the storage tank and the impregnation tank for conveying the flame retardant liquid from the storage tank to the impregnation tank, a reflux assembly connected to both the storage tank and the impregnation tank for conveying the flame retardant liquid from the impregnation tank to the storage tank, a first concentration detection assembly for detecting the concentration of the flame retardant liquid in the storage tank, and a second concentration detection assembly for detecting the concentration of the flame retardant liquid in the impregnation tank. The impregnation tank is equipped with a vacuum gauge and a pressure gauge. The vacuum gauge is used to detect the negative pressure value of the impregnation tank, and the pressure gauge is used to detect the pressure value of the impregnation tank. The vacuum gauge and the pressure gauge are communicatively connected to the PLC controller. The first concentration detection component and the second concentration detection component are electrically connected to the PLC controller, and the PLC controller is connected to the feeder, the liquid extraction component, and the reflux component for control.

2. The continuous and precise impregnation control system for flame-retardant plywood according to claim 1, characterized in that, The feeder is connected to the storage tank through a feed pipe. The storage tank is equipped with a stirring device. A PLC controller is connected to the stirring device for control. The stirring device is used to agitate the flame retardant liquid to fully mix the flame retardant and the flame retardant liquid to increase the concentration of the flame retardant liquid.

3. The continuous and precise impregnation control system for flame-retardant plywood according to claim 1, characterized in that, The liquid extraction assembly includes a vacuum module, a vacuum pipe, and at least one liquid inlet pipe. One end of the vacuum pipe is connected to the vacuum module, and the other end is connected to the internal space of the impregnation tank. One end of the liquid inlet pipe is connected to the internal space of the impregnation tank, and the other end is connected to the internal space of the storage tank. Each liquid inlet pipe is connected in series with a flow control valve. The vacuum module is used to create a vacuum negative pressure environment inside the impregnation tank so that the flame retardant liquid inside the storage tank flows into the impregnation tank through the liquid inlet pipe under the action of pressure difference.

4. The continuous and precise impregnation control system for flame-retardant plywood according to claim 3, characterized in that, The vacuum module includes at least two vacuum pumps, which are connected in series to a vacuum pipeline, and the vacuum pipeline is connected in series with a vacuum electric valve.

5. The continuous and precise impregnation control system for flame-retardant plywood according to claim 3, characterized in that, The liquid extraction assembly also includes a pressurized inlet pipe and a pressurized pump. One end of the pressurized inlet pipe is connected to the internal space of the impregnation tank, and the other end is connected to the internal space of the storage tank. The pressurized pump is connected in series with the pressurized inlet pipe, and the pressurized pump causes the flame retardant liquid inside the storage tank to flow into the impregnation tank through the pressurized inlet pipe.

6. The continuous and precise impregnation control system for flame-retardant plywood according to claim 1, characterized in that, The first concentration detection component includes a first sampling pipe, a first sampling box, and a first concentration detection probe. The first sampling pipe is connected to the internal space of the storage tank, so that the flame retardant liquid inside the storage tank flows into the first sampling box through the first sampling pipe. The first concentration detection probe is installed inside the first sampling box and is used to detect the concentration of the flame retardant liquid flowing into the first sampling box.

7. The continuous and precise impregnation control system for flame-retardant plywood according to claim 1, characterized in that, The reflux assembly includes a reflux pipe and a reflux sampling pump. One end of the reflux pipe is connected to the internal space of the impregnation tank, and the other end is connected to the internal space of the storage tank. Furthermore, a reflux electric valve is connected in series with the reflux pipe, and the reflux sampling pump is connected in series with the reflux pipe. The reflux sampling pump causes the flame retardant liquid inside the impregnation tank to flow into the interior of the storage tank through the reflux pipe.

8. The continuous and precise impregnation control system for flame-retardant plywood according to claim 7, characterized in that, The second concentration detection component includes a second sampling pipe, a second sampling box, and a second concentration detection probe. One end of the second sampling pipe is connected to a reflux pipe. The second sampling pipe is connected in series with a sampling electric valve. A reflux sampling pump causes the flame retardant liquid inside the impregnation tank to flow into the second sampling pipe through the reflux pipe and then into the second sampling box. The second concentration detection probe is installed inside the second sampling box and is used to detect the concentration of the flame retardant liquid flowing into the second sampling box.

9. A control method for a continuous and precise impregnation control system for flame-retardant plywood according to any one of claims 1-8, characterized in that, Includes the following steps: Step S1: Use the first concentration detection probe to detect the concentration of flame retardant liquid inside the storage tank. After the PLC controller obtains the concentration parameters, adjust the working status of the feeder and the stirring device. When the concentration of flame retardant liquid meets the requirements, turn off the feeder and the stirring device. Step S2: The PLC controller starts the vacuum module and creates a vacuum negative pressure environment inside the impregnation tank. The vacuum gauge detects the negative pressure value of the impregnation tank. After obtaining the negative pressure value, the PLC controller adjusts the working status of the vacuum module and the vacuum electric valve. When the negative pressure value of the impregnation tank is greater than 0.7 Pa, the vacuum module and the vacuum electric valve are closed. Step S3: The PLC controller starts the flow control valve so that the flame retardant liquid inside the storage tank flows into the impregnation tank through the inlet pipe under the action of pressure difference. After the flame retardant liquid fills the impregnation tank, the flow control valve is closed. Step S4: The PLC controller starts the booster pump, the pressure gauge detects the pressure value of the impregnation tank, and the PLC controller adjusts the working state of the booster pump after obtaining the pressure value. The booster pump stops when the pressure value of the impregnation tank is greater than 12 Pa. Step S5: Let it soak for 9-11 minutes; Step S6: The PLC controller starts the sampling electric valve, the reflux sampling pump and the reflux electric valve, so that the flame retardant liquid inside the impregnation tank flows into the second sampling pipe through the reflux pipe and then into the second sampling box from the second sampling pipe. The second concentration detection probe detects the concentration of the flame retardant liquid inside the impregnation tank. After the PLC controller obtains the concentration parameters, it adjusts the working state of the booster pump. When the concentration of the flame retardant liquid inside the impregnation tank meets the requirements, the booster pump, the sampling electric valve, the reflux sampling pump and the reflux electric valve are turned off. Step S7: Let it soak for 9-11 minutes; In step S8, when the production set time is reached, the PLC controller starts the reflux sampling pump and reflux electric valve, so that the flame retardant liquid inside the impregnation tank flows into the storage tank through the reflux pipe.

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