Laundry detergent raw material formula linearization premixing equipment and control method

Abstract

The invention discloses laundry detergent raw material formula linear premixing equipment and a control method, and relates to the technical field of daily chemical product production. A centrifugal disc fixedly installed on a main shaft is arranged in a stirring kettle, a scraping assembly is further arranged on a top cover of the stirring kettle, an auxiliary tank used for preliminarily mixing thickening agent powder and liquid water is further arranged above the stirring kettle, a thickening agent injection pipe, a water injection pipe and an air pressure pipe are connected to the top of the auxiliary tank, and the auxiliary tank is further provided with an air pressure monitoring module and a pressure release valve. A distance detection module vertically detecting towards the interior of the auxiliary tank is embedded into the auxiliary tank top cover, a descending pipe is connected to the bottom of the auxiliary tank, and the bottom end of the descending pipe is inserted into the stirring kettle and right faces the upper surface of the centrifugal disc. The thickener can be uniformly distributed in a laundry detergent mixed solution, the stirring efficiency is improved, the kinetic energy of stirring motion is fully utilized, the utilization rate of electric energy is improved, the uniform viscosity of a product is ensured, and the product quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of daily chemical product production, and particularly to a linear premixing device and control method for a laundry detergent raw material formula. Background Art

[0002] In the mixing process of the laundry detergent raw material formula, first, the builder is dissolved in water, and then the surfactant is added to initially form a mixed solution. After completing the above steps, a thickener needs to be added. When adding the thickener, the thickener needs to be pre-made into a paste with a small amount of water in advance, and then slowly added to the above-mentioned mixed solution while stirring, so that the thickener gradually swells and is evenly distributed in the mixed solution to make the laundry detergent reach an appropriate viscosity. If the thickener powder is directly added, it is easy to form lumps and difficult to disperse evenly.

[0003] Currently, some manufacturers adopt the method of manually pre-making the thickener into a paste and then adding it, and some manufacturers use simple stirring equipment to manually and slowly add the thickener paste during the stirring process.

[0004] In summary, the main problems existing in the current mixing process of the laundry detergent raw material formula include low thickener addition efficiency, uneven dispersion, and insufficient automation. These problems not only affect the quality and consistency of the laundry detergent products, but also increase the production cost and operation complexity. Therefore, researching and designing a device that can achieve efficient premixing and uniform dispersion of the thickener and has an intelligent control function has become a technical problem urgently needed to be solved in the industry. Summary of the Invention

[0005] To solve the above technical problems, the present invention is realized through the following technical solutions:

[0006] The present invention provides a linear premixing device for a laundry detergent raw material formula, including a stirring kettle. A main motor is arranged at the top of the stirring kettle. A main shaft connected to the output end of the main motor is arranged inside the stirring kettle. A main stirring paddle is arranged on the circumferential side of the main shaft. A feeding pipe is arranged at the top of the stirring kettle, and a discharging pipe is arranged at the bottom. An centrifugal disk fixedly installed on the main shaft is arranged inside the stirring kettle. The centrifugal disk is located above the main stirring paddle and rotates synchronously with the main stirring paddle. A scraping assembly is further arranged on the top cover of the stirring kettle. The scraping assembly includes a lifter fixed on the top cover of the main stirring paddle. The output end of the lifter is connected with a scraper that extends into the inside of the stirring kettle and is used for scraping the attachments on the upper surface of the centrifugal disk.

[0007] Above the stirring kettle, there is also an auxiliary tank for preliminarily mixing thickener powder and liquid water. The auxiliary tank is equipped with an auxiliary motor, an auxiliary shaft, and auxiliary stirring paddles. The auxiliary motor is fixed on the top of the auxiliary tank. The output end of the auxiliary motor is connected to the auxiliary shaft. The auxiliary shaft extends into the interior of the auxiliary tank movably. The auxiliary stirring paddles are connected to the side of the auxiliary shaft ring. The top of the auxiliary tank is connected with a thickener injection pipe, a water injection pipe, and a pneumatic pipe. The thickener injection pipe is equipped with a first on-off valve. The water injection pipe is equipped with a second on-off valve. The pneumatic pipe is equipped with a third on-off valve. The auxiliary tank is also equipped with a pneumatic pressure monitoring module and a pressure relief valve. The top cover of the auxiliary tank is embedded with a distance detection module that detects vertically towards the interior of the auxiliary tank. The bottom of the auxiliary tank is connected with a downcomer. The bottom end of the downcomer is inserted into the stirring kettle and is directly opposite to the upper surface of the centrifugal disk. The downcomer is equipped with a fourth on-off valve.

[0008] As a preferred technical solution of the premixing equipment of the present invention: The maximum height position of the mixture of thickener and liquid water in the auxiliary tank is flush with the height position of the highest auxiliary stirring paddle.

[0009] As a preferred technical solution of the premixing equipment of the present invention: The upper surface of the centrifugal disk is a horizontal smooth surface, and a barrier cone disk is arranged above the centrifugal disk.

[0010] As a preferred technical solution of the premixing equipment of the present invention: The upstream side of the water injection pipe is connected to a water supply device. The upstream side of the thickener injection pipe is hermetically connected to a container for storing thickener powder externally. The outlet of the water injection pipe and the outlet of the thickener injection pipe are symmetrically or staggeredly distributed at the top inside the auxiliary tank.

[0011] As a preferred technical solution of the premixing equipment of the present invention: The upstream side of the pneumatic pipe is connected to an external gas source. The sensing end of the pneumatic pressure monitoring module is communicated with the internal space of the auxiliary tank. The pneumatic pressure monitoring module is connected to the third on-off valve and the pressure relief valve through a circuit to form a closed-loop pneumatic pressure monitoring and control circuit.

[0012] As a preferred technical solution of the premixing equipment of the present invention: The top end of the downcomer is welded or flange-connected to the bottom of the auxiliary tank. The fourth on-off valve is installed at a position of the downcomer close to the bottom of the auxiliary tank. The bottom end opening of the downcomer is vertically downward and is directly opposite to the center position of the horizontal area on the upper surface of the centrifugal disk.

[0013] As a preferred technical solution of the premixing equipment of the present invention: The length of the scraper is greater than the ring width dimension of the horizontal area on the upper surface of the centrifugal disk.

[0014] As a preferred technical solution of the premixing equipment of the present invention: The lifter adopts a constant-pressure air cylinder, and the lifter is connected to the scraper through a pneumatic connecting rod.

[0015] The present invention also provides a control method for the linearized premixing equipment of the laundry detergent raw material formula, the content is as follows:

[0016] Step 1: Open the first switching valve and the second switching valve, inject a fixed amount of thickener powder into the auxiliary tank through the thickener injection pipe, and inject a fixed amount of liquid water into the auxiliary tank through the water injection pipe.

[0017] Step 2: Start the auxiliary motor to drive the auxiliary stirring paddle to rotate, and stir and mix the thickener and water into a paste.

[0018] Step 3: Through the distance detection module, monitor the liquid level of the paste thickener in the auxiliary tank. If the liquid level is insufficient, repeat Step 1 and Step 2 until the liquid level of the paste thickener reaches the preset amount, then stop the auxiliary motor, and the materials in the auxiliary tank enter the static state.

[0019] Step 4: If the static time exceeds the preset duration, restart the auxiliary motor to drive the auxiliary stirring paddle to stir and maintain the uniform state of the paste thickener.

[0020] Step 5: Open the third switching valve and inject air flow into the auxiliary tank through the air pressure pipe to apply pressure.

[0021] Step 6: Open the fourth switching valve, so that the paste thickener in the auxiliary tank enters the stirring kettle through the down pipe under the action of air pressure. Through the distance detection module, monitor the liquid level of the paste thickener in the auxiliary tank. When the output amount of the paste thickener reaches the standard, close the third switching valve and the fourth switching valve.

[0022] Step 7: Start the main motor to drive the centrifugal disk and the main stirring paddle to rotate synchronously. The output speed of the main motor increases linearly, and after increasing to a certain speed, maintain the rated speed.

[0023] Step 8: According to the actual discharged amount of the paste thickener from the auxiliary tank, dynamically adjust the duration of a single rotation cycle of the main motor. Let the duration of a single rotation cycle of the main motor be 0 - t1 - t2 - t3 - t 总 . Among them, 0 - t2 is the low-speed rotation stage of the centrifugal disk, which evenly throws the paste thickener into the stirring kettle. Among them, t1 - t2 is the scraping cooperation stage, the lifter drives the scraper to move down to scrape the paste thickener attached to the surface of the centrifugal disk, and the scraper moves up and resets after the t2 time node. Among them, t2 - t3 is the high-speed rotation stage, which further improves the throwing range and stirring rate. Among them, t3 - t 总 is the homogeneous mixing stage, and the main stirring paddle fully stirs and mixes the ingredients.

[0024] Step 9: After a single injection of the auxiliary tank is completed, the distance detection module detects the remaining amount of materials in the auxiliary tank. If the remaining amount is insufficient, open the pressure relief valve to release the air pressure, then continue to add materials to the auxiliary tank and repeat the stirring process.

[0025] Step 10: Repeat the process operation content of Step 3 - Step 9.

[0026] Compared with the existing technology, the beneficial effects of the present invention are:

[0027] 1. In the present invention, the thickener powder and water are pre-mixed in the auxiliary tank to form a paste, avoiding the formation of lumps when directly adding the powder. Then, the paste thickener is quickly pressed into the stirring kettle through the pneumatic conveying system. Driven by the main motor, when the centrifugal disk rotates at a low speed, the paste thickener is evenly thrown into the stirring kettle, and during the high-speed rotation stage, the throwing range is further expanded, enabling the thickener to be evenly distributed in the laundry detergent mixture. While improving the stirring efficiency, the kinetic energy of the stirring motion (serving as the centrifugal force of the centrifugal disk) is fully utilized, enhancing the utilization rate of electric energy, ensuring uniform product viscosity, and improving product quality.

[0028] 2. In the present invention, by designing the motion time of the main motor driving the centrifugal disk and the main stirring paddle in a stepped manner, the main functions of each stage are linearly completed, ensuring the centrifugal throwing efficiency of the thickener on the centrifugal disk and adaptively completing the homogeneous mixing process of the laundry detergent mixture. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the overall structure distribution of the equipment of the present invention.

[0030] Figure 2 It is Figure 1 a schematic diagram of the partial enlarged structure at position A in

[0031] Figure 3 It is Figure 1 a schematic diagram of the partial enlarged structure at position B in

[0032] Figure 4 It is a schematic diagram of the centrifugal motion trajectory state of the paste thickener when the main motor drives the centrifugal disk to rotate at a low speed in the present invention.

[0033] Figure 5 It is a schematic diagram of the centrifugal motion trajectory state of the paste thickener when the main motor drives the centrifugal disk to rotate at a high speed in the present invention.

[0034] Figure 6 It is a schematic diagram when the scraper moves downward and contacts the surface layer of the centrifugal disk in the present invention.

[0035] Wherein: 1 - stirring kettle, 101 - feeding pipe, 102 - discharging pipe; 2 - main motor; 3 - main shaft; 4 - main stirring paddle; 5 - centrifugal disk, 501 - barrier cone disk; 6 - auxiliary tank; 7 - auxiliary motor; 8 - auxiliary shaft; 9 - auxiliary stirring paddle; 10 - thickener injection pipe; 11 - first switching valve; 12 - water injection pipe; 13 - second switching valve; 14 - pneumatic pipe; 15 - third switching valve; 16 - pneumatic monitoring module; 17 - pressure relief valve; 18 - distance detection module; 19 - downpipe; 20 - fourth switching valve; 21 - lifter; 22 - scraper. DETAILED DESCRIPTION OF THE INVENTION

[0036] In order to make the objectives, technical solutions and advantages of the present invention more clear and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] Embodiment 1. The present invention designs a linear premixing device for the raw material formula of laundry detergent. Please refer to Figure 1 、 Figure 2 、 Figure 3 , which mainly includes a stirring kettle 1, a secondary tank 6 for supplying paste thickener to the stirring kettle 1, a centrifugal disk 5, a scraping assembly, a pneumatic pressure monitoring assembly, etc. The specific component configuration is as follows:

[0038] I. Stirring kettle 1: As shown in Figure 1 、 Figure 4 、 Figure 5 、 Figure 6 , as the core place for the final mixing of the laundry detergent raw materials, a main motor 2 is installed on the top of the stirring kettle 1 to provide power for the overall stirring operation. The main shaft 3 inside it is connected to the output end of the main motor 2, and a main stirring paddle 4 is arranged on the circumferential side of the main shaft 3 to fully stir the laundry detergent raw materials in the subsequent mixing stage. The feeding pipe 101 on the top of the stirring kettle 1 is used to input other laundry detergent raw materials, and the discharging pipe 102 at the bottom is used to discharge the mixed laundry detergent finished product.

[0039] II. Centrifugal disk 5: As shown in Figure 1 、 Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 , it is fixed on the main shaft 3 and located above the main stirring paddle 4, and can rotate synchronously with the main stirring paddle 4. Its surface is designed as a horizontal smooth surface, which is beneficial to the uniform ejection of the paste thickener to the surrounding under the action of centrifugal force. A barrier cone disk 501 is arranged above the centrifugal disk 5, which can effectively prevent the paste thickener from splashing upwards, ensure that it is smoothly ejected along the surface of the centrifugal disk 5, and then be evenly dispersed into the laundry detergent mixture in the stirring kettle 1.

[0040] III. Scraping assembly: As shown in Figure 1 、 Figure 4 、 Figure 5 、 Figure 6 , it is composed of a lifter 21 installed on the top cover of the stirring kettle 1 and a scraper 22 connected thereto. The lifter 21 adopts a constant-pressure air cylinder and is connected to the scraper 22 through a pneumatic connecting rod, which can stably control the lifting action of the scraper 22. The length of the scraper 22 is greater than the circumferential width dimension of the horizontal area on the upper surface of the centrifugal disk 5, and can comprehensively and effectively scrape the paste thickener attached to the upper surface of the centrifugal disk 5, ensuring that the thickener can fully participate in the mixing and improving the mixing uniformity.

[0041] III. Secondary tank 6: As shown in Figure 1 、 Figure 3, which is set above the stirring kettle 1, is a key component for the preliminary mixing of thickener and water. The auxiliary tank 6 is equipped with an auxiliary motor 7, an auxiliary shaft 8 and an auxiliary stirring paddle 9. The auxiliary motor 7 is fixed to the top of the auxiliary tank 6. During operation, it drives the auxiliary shaft 8 to rotate, and then drives the auxiliary stirring paddle 9 to rotate, stirring the thickener powder and water into a paste. The maximum height position of the mixture of thickener and liquid water in the auxiliary tank 6 is flush with the height position of the highest auxiliary stirring paddle 9, which can not only ensure that the auxiliary stirring paddle 9 fully stirs the mixed liquid, but also avoid the mixture of thickener and liquid water in the too-high area from not being stirred in time and sufficiently.

[0042] IV. Thickener injection pipe 10 and water injection pipe 12: As Figure 3 , the upstream side of the thickener injection pipe 10 is hermetically connected to the container storing the thickener powder externally, and a first switching valve 11 is arranged on the pipeline for precisely controlling the injection amount of the thickener powder. The upstream side of the water injection pipe 12 is connected to the water supply equipment, and a second switching valve 13 is arranged for injecting an appropriate amount of water. Their outlets are symmetrically or staggeredly distributed at the top inside the auxiliary tank 6, so that the thickener powder and water can contact more fully after entering the auxiliary tank 6, accelerating the mixing process.

[0043] V. The air pressure monitoring assembly includes an air pressure pipe 14, an air pressure monitoring module 16 and a pressure relief valve 17: As Figure 3 , the upstream side of the air pressure pipe 14 is connected to an external air source, and a third switching valve 15 is arranged. When it is necessary to transport the paste-like thickener in the auxiliary tank 6 to the stirring kettle 1, the third switching valve 15 is opened, and the external air source injects air flow into the auxiliary tank 6 to pressurize. The sensing end of the air pressure monitoring module 16 is communicated with the internal space of the auxiliary tank 6, and is connected to the third switching valve 15 and the pressure relief valve 17 through a line to form a closed-loop air pressure monitoring and control line. It can monitor the air pressure in the auxiliary tank 6 in real time. When the air pressure is too high, it controls the pressure relief valve 17 to open to release the excess air pressure, ensuring the safe and stable operation of the equipment.

[0044] VI. Distance detection module 18 and downpipe 19: As Figure 2 , Figure 3 , the distance detection module 18 is embedded in the top cover of the auxiliary tank 6 and vertically detects towards the inside of the auxiliary tank 6 for accurately monitoring the liquid level of the paste-like thickener in the auxiliary tank 6. The top end of the downpipe 19 is connected to the bottom of the auxiliary tank 6 by welding or flange, and the bottom end is inserted into the stirring kettle 1 and is directly opposite to the center position of the horizontal area on the upper surface of the centrifugal disk 5. A fourth switching valve 20 is installed on the pipeline. Under the action of air pressure, the paste-like thickener accurately falls on the centrifugal disk 5 through the downpipe 19, providing conditions for subsequent dispersion of the thickener by centrifugal force.

[0045] Embodiment 2. The present invention designs a control method for a linear premixing device of laundry detergent raw material formula, and the specific method content is as follows:

[0046] Link 1. Preparation and preliminary mixing stage

[0047] Step 1. Raw material injection: Open the first switching valve 11 and the second switching valve 13. The thickener injection pipe 10 injects a preset amount of thickener powder into the secondary tank 6, and at the same time, the water injection pipe 12 injects a fixed amount of liquid water into the secondary tank 6. This step prepares the basic raw materials for the subsequent mixing operation.

[0048] Step 2. Stirring and mixing: Start the secondary motor 7. The secondary motor 7 drives the secondary shaft 8 to rotate, and then the secondary stirring paddle 9 rotates in the secondary tank 6. The secondary stirring paddle 9 fully stirs and mixes the thickener powder and water to form a uniform paste-like thickener, effectively avoiding the problem of lumps formed when the thickener powder is directly added.

[0049] Link 2. Liquid level monitoring and replenishment stage

[0050] Step 3. Liquid level detection and adjustment: The distance detection module 18 monitors the liquid level of the paste-like thickener in the secondary tank 6 in real time. If the liquid level does not reach the preset amount, it means that the mixing amount of the thickener and water is insufficient. At this time, repeat Step 1 and Step 2, continuously add raw materials to the secondary tank 6 and stir until the liquid level of the paste-like thickener reaches the preset standard. After reaching the preset amount, stop the secondary motor 7 to make the materials in the secondary tank 6 enter a static state, ensuring that the amount of the paste-like thickener transported to the stirring kettle 1 each time is accurate.

[0051] Step 4. Static maintenance: During the static process, if the static time exceeds the preset duration, to prevent the paste-like thickener from precipitating or stratifying, restart the secondary motor 7 to drive the secondary stirring paddle 9 to stir and maintain its uniform state, ensuring the quality stability of the thickener.

[0052] Link 3. Transportation and mixing stage

[0053] Step 5. Air pressure boosting: Open the third switching valve 15, and the external air source injects air flow into the secondary tank 6 through the air pressure pipe 14 for boosting. At this time, the air pressure monitoring module 16 monitors the air pressure in the secondary tank 6 in real time to ensure that the air pressure is within a suitable range, providing stable power for the subsequent transportation of the paste-like thickener.

[0054] Step 6. Material transportation: Open the fourth switching valve 20. Under the action of air pressure, the paste-like thickener in the secondary tank 6 enters the stirring kettle 1 through the downpipe 19. During the transportation process, the distance detection module 18 continuously monitors the liquid level of the paste-like thickener in the secondary tank 6. When the output amount reaches the preset standard, immediately close the third switching valve 15 and the fourth switching valve 20 to accurately control the addition amount of the thickener and ensure the accuracy of the mixing ratio of the laundry detergent.

[0055] Step 7. Main stirring start and speed regulation: Start the main motor 2. The main motor 2 operates according to the operation cycle 0 - t1 - t2 - t3 - t 总Rotation: The main motor 2 drives the centrifugal disk 5 and the main stirring paddle 4 to rotate synchronously. The output speed of the main motor 2 increases in a linear manner. In the low-speed stage (0 - t2), the centrifugal disk 5 rotates slowly, evenly throwing the paste thickener that has fallen on it into the stirring kettle 1 to initially disperse the thickener.

[0056] Step Eight. Multi-stage stirring and mixing: In the stage of t1 - t2, the lifter 21 drives the scraper 22 to move downward, scraping up the paste thickener adhering to the surface of the centrifugal disk 5 so that it can also enter the stirring kettle 1 to participate in the mixing. After the time node of t2, the scraper 22 moves upward to reset. In the stage of t2 - t3, the speed of the main motor 2 increases, and the centrifugal disk 5 enters the high-speed rotation stage, further expanding the throwing range of the paste thickener. At the same time, the stirring rate of the main stirring paddle 4 increases to enhance the mixing effect. The stage of t3 - t 总 is the homogeneous mixing stage. The main stirring paddle 4 fully stirs and mixes the ingredients, enabling the thickener to be evenly mixed with other laundry detergent raw materials to ensure the viscosity uniformity and quality stability of the laundry detergent product.

[0057] Link Four. Circulation production stage

[0058] Step Nine. Detection and replenishment of the remaining amount: After the single injection of the auxiliary tank 6 is completed, the distance detection module 18 detects the remaining amount of the material in the auxiliary tank 6. If the remaining amount is insufficient, the pressure relief valve 17 is opened to release the air pressure in the auxiliary tank 6, and then the auxiliary tank 6 is refilled, repeating the above processes of stirring, conveying, mixing, etc. to achieve continuous production.

[0059] Step Ten. Circulation operation: Continuously repeat the process operation content of Steps Three to Nine, continuously perform the premixing operation of the laundry detergent raw materials, improve the production efficiency, and meet the requirements of industrial production.

[0060] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A linear premixing device for a laundry detergent raw material formula, comprising a stirring kettle (1), wherein a main motor (2) is arranged on the top of the stirring kettle (1), a main shaft (3) connected to the output end of the main motor (2) is arranged inside the stirring kettle (1), a main stirring paddle (4) is arranged on the side of the main shaft (3), a material injection pipe (101) is arranged on the top of the stirring kettle (1), and a material discharge pipe (102) is arranged on the bottom, characterized in that: The stirring kettle (1) is provided with a centrifugal disc (5) fixedly mounted on the main shaft (3), the centrifugal disc (5) being located above the main stirring paddle (4) and rotating synchronously with the main stirring paddle (4), the top cover of the stirring kettle (1) is also provided with a scraping assembly, the scraping assembly comprising a lifter (21) fixed to the top cover of the main stirring paddle (4), the output end of the lifter (21) being connected with a scraper (22) extending into the stirring kettle (1) and cooperating to scrape off the attachments on the upper surface of the centrifugal disc (5); A secondary tank (6) for preliminarily mixing thickener powder and liquid water is also arranged above the stirring tank (1). The secondary tank (6) is provided with a secondary motor (7), a secondary shaft (8), and a secondary stirring paddle (9). The secondary motor (7) is fixed to the top of the secondary tank (6). The output end of the secondary motor (7) is connected to the secondary shaft (8). The secondary shaft (8) movably extends into the interior of the secondary tank (6). The secondary stirring paddle (9) is connected to the ring side of the secondary shaft (8). The top of the auxiliary tank (6) is connected to a thickener injection pipe (10), a water injection pipe (12), and an air pressure pipe (14); the thickener injection pipe (10) is provided with a first switch valve (11), the water injection pipe (12) is provided with a second switch valve (13), and the air pressure pipe (14) is provided with a third switch valve (15); The auxiliary tank (6) is further provided with an air pressure monitoring module (16) and a pressure relief valve (17); a distance detection module (18) vertically directed toward the interior of the auxiliary tank (6) is embedded in the top cover of the auxiliary tank (6); a descending pipe (19) is connected to the bottom of the auxiliary tank (6); the bottom end of the descending pipe (19) is inserted into the stirring kettle (1) and is directly opposite to the upper surface of the centrifugal disc (5); and the descending pipe (19) is provided with a fourth switch valve (20).

2. A linear premixing device for laundry detergent raw material formula according to claim 1, characterized in that: The maximum height position of the mixture of thickener and liquid water in the auxiliary tank (6) is flush with the height position of the auxiliary stirring paddle (9) at the highest position.

3. A linear premixing device for laundry detergent raw material formula according to claim 1, characterized in that: The upper surface of the centrifugal disk (5) is a horizontal smooth surface, and a blocking cone disk (501) is provided above the centrifugal disk (5).

4. A linear premixing device for laundry detergent raw material formula according to claim 1, characterized in that: The upstream side of the water injection pipe (12) is connected to a water supply device, the upstream side of the thickener injection pipe (10) is sealedly connected to an external container for storing thickener powder, and the outlet of the water injection pipe (12) and the outlet of the thickener injection pipe (10) are symmetrically or staggeredly distributed at the top of the auxiliary tank (6).

5. A linear premixing device for a laundry detergent raw material formula according to claim 1, characterized in that: An external air source is connected to the upstream side of the air pressure pipe (14), the sensing end of the air pressure monitoring module (16) is communicated with the internal space of the secondary tank (6), and the air pressure monitoring module (16) is connected to the third switching valve (15) and the pressure relief valve (17) through a circuit to form a closed-loop air pressure monitoring and control circuit.

6. A linear premixing device for a laundry detergent raw material formula according to claim 1, characterized in that: The top end of the downward pipe (19) is welded or flange-connected to the bottom of the secondary tank (6), and the fourth switching valve (20) is installed at a position of the downward pipe (19) close to the bottom of the secondary tank (6); The bottom end opening of the downward pipe (19) is vertically downward and directly opposite to the center position of the horizontal area on the upper surface of the centrifugal disk (5).

7. A linear premixing device for a laundry detergent raw material formula according to claim 1, characterized in that: The length of the scraper (22) is greater than the ring width dimension of the horizontal area on the upper surface of the centrifugal disk (5).

8. A linear premixing device for a laundry detergent raw material formula according to claim 1, characterized in that: The lifter (21) adopts a constant-pressure air cylinder, and the lifter (21) is connected to the scraper (22) through a pneumatic connecting rod.

9. A control method for a linear premixing device of a laundry detergent raw material formula according to any one of claims 1 to 8, characterized in that, It includes the following steps: Step 1: Open the first switching valve (11) and the second switching valve (13), and inject a fixed amount of thickener powder into the secondary tank (6) through the thickener injection pipe (10) and inject a fixed amount of liquid water into the secondary tank (6) through the water injection pipe (12); Step 2: Start the secondary motor (7) to drive the secondary stirring paddle (9) to rotate, and stir and mix the thickener and water into a paste; Step 3: Through the distance detection module (18), monitor the liquid level of the paste thickener in the secondary tank (6). If the liquid level is insufficient, repeat Step 1 and Step 2 until the liquid level of the paste thickener reaches the preset amount, stop the secondary motor (7), and the material in the secondary tank (6) enters a static state; Step 4: If the static time exceeds the preset duration, restart the secondary motor (7) to drive the secondary stirring paddle (9) to stir and maintain the uniform state of the paste thickener; Step 5: Open the third switching valve (15) and inject air flow pressure into the secondary tank (6) through the air pressure pipe (14); Step 6: Open the fourth switching valve (20), so that the paste thickener in the secondary tank (6) enters the stirring kettle (1) through the downward pipe (19) under the action of air pressure. Through the distance detection module (18), monitor the liquid level of the paste thickener in the secondary tank (6). When the output amount of the paste thickener reaches the standard, the third switching valve (15) and the fourth switching valve (20) are closed; Step 7: Start the main motor (2) to drive the centrifugal disk (5) and the main stirring paddle (4) to rotate synchronously. The output speed of the main motor (2) linearly increases and remains at a rated speed after increasing to a certain speed; Step Eight: Dynamically adjust the duration of a single rotation cycle of the main motor (2) according to the actual discharged paste thickening agent amount of the auxiliary tank (6). Let the duration of a single rotation cycle of the main motor (2) be 0 - t1 - t2 - t3 - t 总 ; Among them, 0 - t2 is the low-speed rotation stage of the centrifugal disk (5), which evenly throws the paste thickener into the stirring kettle (1); Among them, t1 - t2 is the scraping and matching stage, the lifter (21) drives the scraper (22) to move downward to scrape up the paste thickener attached to the surface of the centrifugal disk (5), and after the time node of t2, the scraper (22) moves upward to reset; Among them, t2 - t3 is the high-speed rotation stage, which further improves the throwing range and stirring rate; Among them, t3 - t 总 is the homogeneous mixing stage, and the main stirring paddle (4) fully stirs and mixes the ingredients; Step Nine: After the single injection of the secondary tank (6) is completed, the distance detection module (18) detects the remaining amount of the material in the secondary tank (6). If the remaining amount is insufficient, open the pressure relief valve (17) to release the air pressure, and then continue to add material to the secondary tank (6) and repeat the stirring process; Step Ten: Repeat the operation content of Steps Three to Nine.

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