Automatic mixing control device for natural rubber latex and acid liquor

Abstract

The invention discloses an automatic mixing control device for natural rubber latex and acid liquor. The device is provided with a latex pool (1) and an acid liquor pool (2), a latex pipeline (3) is connected below the latex pool (1), an electromagnetic valve (4) is arranged on the latex pipeline (3), and an electromagnetic flowmeter (6) is arranged at the rear part of the electromagnetic valve (4). An acid liquor pipeline (10) is connected below the acid liquor pool (2), an electric control valve (11) is arranged on the acid liquor pipeline (10), and a turbine flowmeter (13) is arranged at the rear end of the electric control valve (11). The tail ends of the latex pipeline (3) and the acid liquor pipeline (10) are provided with a glue-acid mixing pool (16), a glue-acid mixing pipeline (17) is arranged behind the glue-acid mixing pool pipeline (16), and the tail end of the glue-acid mixing pipeline (17) is provided with a PH value measuring probe (19) and a PH value measuring instrument (18). The device has the beneficial effects that the automation of the latex solidification acid preparation process is realized, the labor cost is reduced, the production efficiency is improved, and the stability of the product quality is ensured.

Description

Technical Field

[0001] This invention relates to a natural rubber standard rubber processing equipment, specifically to an automatic mixing and control device for latex and acid. Background Technology

[0002] Natural rubber, along with petroleum, steel, and coal, is known as one of the four pillars of industrial raw materials, playing an indispensable role in the development of modern human society. Generally speaking, natural rubber refers to the elastic solid material made from natural latex collected from the Brazilian rubber tree through processes such as coagulation and drying. Natural rubber possesses excellent resilience, insulation, water resistance, and plasticity. After proper processing, it also exhibits oil and acid resistance, making natural rubber products used in a wide range of industries, from household appliances to airplanes and ships.

[0003] Latex refers to the raw material harvested from rubber trees. To facilitate preservation, an appropriate amount of ammonia is added to the latex to prevent it from coagulating. It is then sent to a natural rubber primary processing plant, where it undergoes processes such as coagulation, thinning, creping, pelletizing, and drying to ultimately produce standard rubber, which is then supplied to rubber product processing companies. In the coagulation process, the natural rubber primary processing plant prepares an acid solution equal to 1 / 10 the volume of the latex, based on the ammonia content, to stabilize the pH value of the mixture at approximately 5.5. The acid and latex are then strictly mixed in a 1:10 ratio and poured into the coagulation tank.

[0004] Currently, the amount of acid added during the process of latex flowing into the coagulation tank relies entirely on manual testing of the natural latex's pH level and manual control of the acid addition valve opening, resulting in an acid-to-latex mixing ratio of 1:10. This method is not only inefficient but also produces highly uneven mixing, leading to unstable quality of the coagulated rubber and directly affecting the processing quality of the standard rubber. Therefore, an automatic mixing control device for natural rubber latex and acid is designed to automatically control the mixing ratio, improving work efficiency and, more importantly, ensuring the quality of the natural rubber standard rubber. Summary of the Invention

[0005] This invention is an automatic mixing control device for natural rubber latex and acid solution, which can realize automatic control of the mixing ratio of latex and acid solution. It is simple to operate, accurate in proportion, and can effectively improve the quality of natural rubber standard rubber.

[0006] The technical solution adopted in this invention is as follows: A latex tank and an acid tank are provided. A latex pipe is connected to the bottom of the latex tank, and a solenoid valve is installed on the latex pipe. An electromagnetic flow meter is installed after the solenoid valve. An acid pipe is connected to the bottom of the acid tank, and an electric regulating valve is installed on the acid pipe. A turbine flow meter is installed after the electric regulating valve. A latex-acid mixing tank is provided at the end of both the latex and acid pipes. A latex-acid mixing pipe is provided after the latex-acid mixing tank, and a pH measuring probe and a pH meter are installed at the end of the latex-acid mixing pipe.

[0007] The control process of the automatic control device is as follows: When the latex needs to solidify, the power is turned on, and the control system sends a signal to the solenoid valve. The solenoid valve opens, and the latex reaches the electromagnetic flowmeter through the latex pipeline. The electromagnetic flowmeter detects the flow of latex and generates an electrical signal, which is transmitted to the control system. The control system calculates the instantaneous flow rate of the latex based on the electrical signal from the electromagnetic flowmeter. According to the process requirements, based on a latex to acid ratio of 10:1, the target instantaneous flow rate of the acid is calculated and compared with the actual instantaneous flow rate of the acid measured by the turbine flowmeter. Then, the valve opening is adjusted by the actuator of the electric regulating valve. If the target value is greater than the actual value, the control system drives the actuator of the electric regulating valve to increase the valve opening. If the target value is less than the actual value, the control system drives the actuator of the electric regulating valve to decrease the valve opening. As the total volume of latex and acid decreases continuously during the drainage process, the liquid levels of latex and acid drop. Different liquid levels result in different pressures and thus different flow rates. Therefore, it is necessary to adjust the valve opening of the electric regulating valve in real time based on the real-time flow rate of latex through the electromagnetic flowmeter and the real-time flow rate of acid through the turbine flowmeter to ensure that the instantaneous flow ratio of latex and acid is controlled at 10:1.

[0008] After the latex and acid are mixed in the latex-acid mixing tank, they flow into the coagulation tank through the latex-acid mixing pipe. A pH value measuring probe is installed at the end of the latex-acid mixing pipe. The pH value measuring probe displays the measured pH value of the latex-acid mixture on the pH value measuring instrument for easy manual observation.

[0009] Once all the latex in the latex tank has been drained, and the latex flow signal measured by the electromagnetic flowmeter is less than the set minimum value, the control system sends a signal to de-energize the solenoid valve, close the latex pipeline, and the electromagnetic flowmeter detects zero. The target value is zero, and finally, the electric regulating valve closes, and the acid pipeline is shut off.

[0010] The beneficial effects of this invention are that it transforms the acid preparation process in the coagulation of natural rubber latex from manual operation to automatic control, thereby automating the coagulation and acid preparation process, reducing labor costs, improving production efficiency, and ensuring stable product quality. Attached Figure Description

[0011] Figure 1This is a schematic diagram illustrating the working principle of an embodiment of the present invention.

[0012] In the diagram: 1. Latex tank 2. Acid tank 3. Latex pipe 4. Solenoid valve 5. Solenoid valve coil 6. Electromagnetic flow meter 7. Excitation coil 8. Iron core 9. Electrode 10. Acid pipe 11. Electric regulating valve 12. Actuator 13. Turbine flow meter 14. Magnetoelectric converter 15. Solenoid coil 16. Latex-acid mixing tank 17. Latex-acid mixing pipe 18. pH meter 19. pH measuring probe 20. Coagulation tank. Detailed Implementation

[0013] The system includes a latex tank (1) and an acid tank (2). A latex pipe (3) is connected to the bottom of the latex tank (1). A solenoid valve (4) is installed on the latex pipe (3), and an electromagnetic flow meter (6) is installed at the rear of the solenoid valve (4). An acid pipe (10) is connected to the bottom of the acid tank (2). An electric regulating valve (11) is installed on the acid pipe (10), and a turbine flow meter (13) is installed at the rear of the electric regulating valve (11). A latex-acid mixing tank (16) is located at the end of the latex pipe (3) and the acid pipe (10). A latex-acid mixing pipe (17) is located after the latex-acid mixing pipe (16). A pH measuring probe (19) and a pH meter (18) are installed at the end of the latex-acid mixing pipe (17).

[0014] The control process of the automatic control device: When the latex needs to solidify, the power is turned on and the control system sends a signal to the solenoid valve (4). The solenoid valve (4) opens and the latex reaches the electromagnetic flow meter (6) through the latex pipe (3). The electromagnetic flow meter (6) detects the flow of latex and generates an electrical signal, which is transmitted to the control system. The control system calculates the instantaneous flow rate of the latex through the electrical signal of the electromagnetic flow meter (6). According to the process requirements, the instantaneous flow rate target value of the acid is calculated according to the ratio of latex to acid of 10:1. It is compared with the actual instantaneous flow rate of the acid measured by the turbine flow meter (13). Then, the valve opening is adjusted by the actuator (12) of the electric regulating valve (11). If the target value is greater than the actual value, the control system drives the actuator (12) of the electric regulating valve (11) to increase the valve opening of the electric regulating valve (11). If the target value is less than the actual value, the control system drives the actuator (12) of the electric regulating valve (11) to decrease the valve opening of the electric regulating valve (11). Since the total amount of latex and acid will decrease continuously during the drainage process, the liquid levels of latex and acid will drop. Different liquid levels result in different pressures and flow rates. Therefore, it is necessary to adjust the valve opening of the electric regulating valve (11) in real time according to the real-time flow rate of the latex through the electromagnetic flowmeter (6) and the real-time flow rate of the acid through the turbine flowmeter (13) to ensure that the instantaneous flow ratio of latex and acid is controlled at 10:1.

[0015] After the latex and acid are mixed in the latex-acid mixing tank (16), they flow into the coagulation tank (20) through the latex-acid mixing pipe (17). A pH value measuring probe (19) is provided at the end of the latex-acid mixing pipe (17). The pH value measuring probe (19) displays the measured pH value of the latex-acid mixture on the pH value measuring instrument (18) for easy manual observation.

[0016] When all the latex in the latex tank is drained, the latex flow signal measured by the electromagnetic flowmeter (6) is less than the set minimum value. The control system sends a signal, the solenoid valve (4) is de-energized, the latex pipeline (3) is closed, the electromagnetic flowmeter (6) detects a zero signal, the target value is zero, and finally, the electric regulating valve (11) is closed and the acid pipeline (10) is closed.

Claims

1. An automatic mixing control device for natural rubber latex and acid, characterized in that: The system includes a latex tank (1) and an acid tank (2). A latex pipe (3) is connected to the bottom of the latex tank (1). A solenoid valve (4) is installed on the latex pipe (3), and an electromagnetic flow meter (6) is installed at the rear of the solenoid valve (4). An acid pipe (10) is connected to the bottom of the acid tank (2). An electric regulating valve (11) is installed on the acid pipe (10), and a turbine flow meter (13) is installed at the rear of the electric regulating valve (11). A latex-acid mixing tank (16) is located at the end of the latex pipe (3) and the acid pipe (10). A latex-acid mixing pipe (17) is located after the latex-acid mixing pipe (16). A pH measuring probe (19) and a pH meter (18) are installed at the end of the latex-acid mixing pipe (17).

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