Accurate quantitative feeding device and process for additive for antifreezing solution production

Abstract

The invention relates to the technical field of anti-freezing solution production, and discloses an additive precise quantitative feeding device and process for anti-freezing solution production, the device comprises a weighbridge, a protection mechanism is arranged at the top end of the weighbridge, a liquid storage tank is placed on the protection mechanism, and a bracket mechanism is arranged on the outer side of the liquid storage tank; a pipeline assembly is arranged on the outer side of a barrel opening of the liquid storage tank, a liquid outlet end of the pipeline assembly is connected with a gear pump, a three-way valve is arranged on the outer side of the gear pump, an air pump is arranged on the outer side of the three-way valve, a back pressure valve is arranged on the outer side of the three-way valve, and a reaction kettle is arranged on the outer side of the back pressure valve. The liquid storage tank is guided to slide into the center of the bottom plate through the angle of the positioning baffle, impact force is transmitted to the I-shaped block through the bottom plate, the I-shaped block extrudes the rubber pad to achieve primary buffering, the bottom plate transmits residual vibration to the damping spring to complete secondary absorption, a weighbridge sensor is prevented from being damaged, and stable data are provided for the initial weight of additive metering.

Description

A precise metering device and process for additives used in antifreeze production Technical Field

[0001] This invention relates to the field of antifreeze production technology, specifically to a device and process for precise quantitative feeding of additives for antifreeze production. Background Technology

[0002] Antifreeze requires the addition of various functional additives during production, such as corrosion inhibitors, rust inhibitors, and pH adjusters. The accuracy of these additive additions directly affects the freezing point, corrosion resistance, and batch consistency of the finished antifreeze. As the quality requirements for antifreeze products continue to increase, manufacturers are placing more stringent demands on the metering accuracy and stability of the additive addition process.

[0003] Currently, antifreeze manufacturers generally use forklifts to transport drummed additive storage tanks during the additive feeding process. The storage tanks are then placed on a weighbridge for weighing, and the additives are manually transported to the reaction vessel. The weighbridge has a built-in high-precision sensor to collect the total weight of the storage tank and the liquid inside in real time. Operators control the feeding amount based on the data displayed on the weighbridge, thus achieving measurement and control of the amount of additives added.

[0004] In existing technologies, when a storage tank is placed on a weighbridge by a forklift, the forklift's descent generates a significant impact load. This impact force is directly transmitted to the high-precision sensor built into the weighbridge. Long-term, frequent impacts can easily cause zero-point drift, decreased measurement accuracy, or even permanent damage to the sensor, affecting the accuracy of additive metering. Since the amount of additives added in antifreeze production usually needs to be precisely controlled within a small error range, once the sensor's accuracy deteriorates, the actual amount added will deviate from the process setting value, thus affecting the quality of the antifreeze product. Therefore, a precise metering device and process for additives in antifreeze production is proposed to solve the above problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a precise quantitative feeding device and process for additives used in antifreeze production, which solves the problem of large impact loads generated when the storage tank is placed on a weighbridge by a forklift during the moment of descent.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a precise quantitative feeding device and process for additives used in antifreeze production, comprising a weighbridge, a protective mechanism at the top of the weighbridge, a storage tank placed on the protective mechanism, a bracket mechanism on the outside of the storage tank, a pipe assembly on the outside of the opening of the storage tank, a gear pump connected to the outlet end of the pipe assembly, a three-way valve on the outside of the gear pump, an air pump on the outside of the three-way valve, a back pressure valve on the outside of the three-way valve, and a reaction vessel on the outside of the back pressure valve;

[0007] The pipeline assembly includes a liquid extraction tube, a positioning plate is slidably connected to the outside of the liquid extraction tube, and a locking ring is fixedly connected to the bottom end of the positioning plate.

[0008] Preferably, the protective mechanism includes a base plate, with multiple fixing plates fixedly connected to the bottom end of the base plate. Each of the multiple fixing plates has a rubber pad at its bottom end, and an I-shaped block is fixedly connected to the outer side of the rubber pad. The outer side of the fixing plate is located at the top of the weighbridge.

[0009] Preferably, the bracket mechanism includes a base, the outer side of which is disposed on the outer side of the liquid storage tank, a liquid receiving frame is fixedly connected to the top of the base, a guide groove is fixedly connected inside the liquid receiving frame, a bracket is fixedly connected to the top of the base, and a constraint component is disposed on the outer side of the bracket.

[0010] Preferably, the constraint assembly includes a slider, the inner side of which is slidably connected to the outer side of the bracket, and two external top plates are fixedly connected to the outer side of the slider. Each of the two external top plates is fixedly connected to a limit plate, and a hand clamp is rotatably connected to the outer side of the limit plate. A spring is provided on the outer side of the hand clamp.

[0011] Preferably, one end of the spring abuts against the outside of the hand clamp, and the other end of the spring abuts against the outside of the external top plate.

[0012] Preferably, the liquid extraction end of the extraction tube is provided with multiple V-shaped grooves to prevent the liquid extraction end of the extraction tube from sticking to the bottom of the storage tank.

[0013] Preferably, the outer side of the opening of the liquid storage tank is threaded to the inner side of the locking ring, and the inner side of the positioning plate is threaded to two locking bolts.

[0014] Preferably, the bottom end of the fixing plate is provided with a shock-absorbing spring for cushioning and protecting the weighbridge.

[0015] Preferably, a positioning baffle is fixedly connected to the top of the base plate to guide the liquid storage tank to automatically slide into the center position of the weighbridge.

[0016] This invention also provides a process for a precise quantitative feeding device for additives used in antifreeze production, comprising the following steps:

[0017] The storage tank containing the additive is placed on the base plate by a forklift. The positioning baffle on the base plate guides the storage tank to slide automatically into the center of the base plate, thus obtaining the storage tank after positioning.

[0018] The total weight of the storage tank and the liquid inside is collected in real time by the weighbridge after the positioning is completed. The suction pipe is inserted into the storage tank, the position of the positioning plate on the outside of the suction pipe is adjusted, and then the locking bolt is rotated to fix it, so that the suction pipe is sealed and fixed at the mouth of the storage tank. At the same time, the bottom of the suction pipe is suspended above the bottom of the storage tank, thus obtaining the connected suction pipe.

[0019] Adjust the three-way valve to connect the gear pump to the pipeline of the reactor, start the gear pump, and draw liquid from the storage tank through the connected liquid extraction pipe, and transport it to the reactor through the pipeline assembly;

[0020] Check the weight shown on the scale. Once the required dosage is reached, turn off the gear pump and back pressure valve. The back pressure valve cuts off the liquid column in the pipeline. Adjust the three-way valve to connect the air pump to the pipeline of the reactor. Turn on the air pump to introduce compressed air into the pipeline and use the airflow to blow all the remaining liquid in the pipeline into the reactor.

[0021] When replacing the storage tank, remove the extraction pipe from the old storage tank opening and place it on the bracket mechanism with the pipe opening facing down. Secure the extraction pipe with the constraint component. The additives remaining in the extraction pipe will fall into the receiving frame under gravity, be guided and collected through the guide channel, and added to the reaction vessel.

[0022] This invention provides a device and process for precise quantitative feeding of additives used in antifreeze production. It offers the following advantages:

[0023] 1. This invention guides the liquid storage tank to slide into the center of the base plate by utilizing the angle of the positioning baffle. The base plate then transmits the impact force to the I-shaped block, which compresses the rubber pad to achieve primary buffering. The base plate then transmits the remaining vibration to the shock-absorbing spring to complete secondary absorption, thereby gradually dissipating the impact of forklift operation, avoiding damage to the weighbridge sensor, and ensuring the position of the liquid storage tank's force point during each weighing, thus providing stable data for the starting weight of additive measurement.

[0024] 2. This invention breaks the negative pressure adsorption conditions by opening V-shaped grooves around the end of the liquid extraction tube. The positioning plate slides along the axial direction of the liquid extraction tube to adjust it to the position where it fits the tank opening. The locking bolt drives the locking ring to lock the positioning plate. The positioning plate drives the bottom of the liquid extraction tube to be accurately suspended above the bottom of the tank, which not only achieves a sealed connection but also prevents the tube opening from being adsorbed and blocked.

[0025] 3. This invention places the liquid extraction tube on the bracket mechanism, and a spring drives the slider to slide along the bracket. The slider drives a pair of clamps to hold and fix the liquid extraction tube. With the tube opening facing down, the residual liquid drips into the liquid receiving frame under the action of gravity. The liquid receiving frame collects the liquid into the guide channel, which solves the problem of residual liquid leakage and pollution when not in use, avoids the loss of residual liquid during tank changing, and reduces the quantitative deviation caused by residual liquid loss.

[0026] 4. When the gear pump stops working, the back pressure valve instantly closes to cut off the liquid column in the pipeline. The air pump is started to introduce compressed air through a three-way valve. The compressed air blows all the residual liquid in the pipeline into the reactor, avoiding material loss, preventing cross-contamination between different batches, and improving the cleanliness and metering accuracy of the transport. Attached Figure Description

[0027] Figure 1 is a perspective view of the present invention;

[0028] Figure 2 is a schematic diagram of the structure of the liquid extraction tube being clamped according to the present invention;

[0029] Figure 3 is a schematic diagram of the pipe assembly of the present invention;

[0030] Figure 4 is an exploded view of the connection portion of the present invention;

[0031] Figure 5 is a structural schematic diagram of the bracket mechanism of the present invention;

[0032] Figure 6 is an enlarged view of point A in Figure 5 of the present invention;

[0033] Figure 7 is an exploded view of the protective mechanism of the present invention;

[0034] Figure 8 is a schematic diagram of the structure of the buffer part of the present invention.

[0035] Among them, 1. floor scale; 2. liquid storage tank;

[0036] 3. Piping assembly; 31. Suction pipe; 32. Positioning plate; 33. Locking ring; 34. Locking bolt;

[0037] 4. Gear pump; 5. Reactor;

[0038] 6. Protective mechanism; 61. Base plate; 62. Positioning baffle; 63. Fixing plate; 64. I-shaped block; 65. Rubber pad; 66. Shock-absorbing spring;

[0039] 7. Bracket mechanism; 71. Base; 72. Liquid receiving frame; 73. Flow guide channel; 74. Support;

[0040] 75. Constraint assembly; 751. Slider; 752. External top plate; 753. Limiting plate; 754. Hand clamp; 755. Spring;

[0041] 8. Three-way valve; 9. Air pump; 10. Back pressure valve. Detailed Implementation

[0042] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] Please refer to Figures 1 and 2. This embodiment of the invention provides a precise quantitative feeding device and process for antifreeze additives, including a weighbridge 1. The weighbridge 1 serves as the core of the entire device for precise weighing, providing real-time and accurate weight data support for the quantitative feeding of antifreeze additives. A protective mechanism 6 is installed at the top of the weighbridge 1, providing double buffer protection for the weighbridge 1 and the storage tank 2 to prevent equipment damage and displacement of the storage tank 2. The storage tank 2 is placed on the protective mechanism 6, serving as a storage carrier for the antifreeze additives, providing a sealed and stable storage space to prevent leakage and contamination. A bracket mechanism 7 is installed on the outside of the storage tank 2, used to temporarily store idle suction pipes 31 and collect residual liquid, preventing residual liquid dripping and environmental pollution, and material waste. A pipe assembly 3 is installed on the outside of the opening of the storage tank 2. Pipeline assembly 3 serves as the delivery channel for antifreeze additives, achieving a sealed connection between the storage tank 2 and subsequent delivery components to ensure smooth delivery. A gear pump 4 is connected to the outlet end of pipeline assembly 3, providing stable power for additive delivery and ensuring uniform and controllable feeding speed. A three-way valve 8 is installed on the outside of gear pump 4, used to switch delivery paths, enabling rapid switching between feeding and residual liquid purging, improving operational efficiency. An air pump 9 is installed on the outside of three-way valve 8, providing compressed air for pipeline residual liquid purging to remove residual additives from the pipeline. A back pressure valve 10 is installed on the outside of three-way valve 8, used to cut off the pipeline liquid column and maintain internal pressure, ensuring quantitative accuracy. A reaction vessel 5 is installed on the outside of back pressure valve 10, serving as the final receiving container for additives, achieving precise mixing of additives and antifreeze raw materials.

[0044] Please refer to Figures 3 and 4. The pipeline assembly 3 includes a suction pipe 31, which serves as the core component for extracting antifreeze additives. The suction pipe 31 penetrates deep into the storage tank 2 to extract the additives, ensuring no residue is left after extraction. A positioning plate 32 is slidably connected to the outside of the suction pipe 31. The positioning plate 32 is height-adjustable to accommodate the opening height of different sizes of storage tanks 2, improving the versatility of the device. A locking ring 33 is fixedly connected to the bottom of the positioning plate 32. The locking ring 33 engages with the threaded opening of the storage tank 2 to achieve a sealed fixation between the suction pipe 31 and the storage tank 2, preventing air and liquid leakage during extraction. The liquid-drawing end of the liquid pipe 31 is provided with multiple V-shaped grooves. The V-shaped grooves can break the negative pressure adsorption state of the liquid-drawing end and prevent the contact surface of the liquid-drawing end of the liquid pipe 31 from sticking to the bottom of the liquid storage tank 2. The outer side of the opening of the liquid storage tank 2 is threaded to the inner side of the locking ring 33. The threaded connection method is tight-sealed, easy to disassemble and assemble, and facilitates quick replacement of the liquid storage tank 2. The internal thread of the positioning plate 32 is connected to two locking bolts 34. The two locking bolts 34 are symmetrically arranged and can firmly lock the positioning plate 32 on the liquid-drawing pipe 31 to prevent the positioning plate 32 from shifting during the liquid-drawing process, and ensure the sealing effect and the stability of the liquid-drawing process.

[0045] Please refer to Figures 7 and 8. The protective mechanism 6 includes a base plate 61, which serves as the basic carrier of the protective mechanism 6, providing a stable placement platform for the liquid storage tank 2 and ensuring uniform force distribution on the tank. Multiple fixing plates 63 are fixedly connected to the bottom of the base plate 61, evenly distributed to provide stable support and precisely connect with the weighing scale 1. Rubber pads 65 are provided at the bottom of each fixing plate 63, providing flexible cushioning to further reduce impact and protect the weighing scale 1's sensors. I-shaped blocks 64 are fixedly connected to the outer side of the rubber pads 65, reinforcing the structure of the rubber pads 65. To ensure structural stability and prevent deformation of the rubber pad 65 under stress, thus improving the cushioning effect, the outer side of the fixing plate 63 is set at the top of the weighbridge 1. The fixing plate 63 fits tightly with the weighbridge 1 to ensure accurate transmission of weighing data without deviation. The bottom end of the fixing plate 63 is equipped with a shock-absorbing spring 66, which can absorb the impact force when the forklift places the liquid storage tank 2, and is used to cushion and protect the weighbridge 1 to prevent damage to the built-in high-precision sensor of the weighbridge 1. The top of the base plate 61 is fixedly connected to a positioning baffle 62, which has a guide angle to guide the liquid storage tank 2 to automatically slide into the center position of the weighbridge 1, ensuring the force point of each weighing and improving weighing accuracy.

[0046] Please refer to Figures 5 and 6. The bracket mechanism 7 includes a base 71, which serves as the mounting foundation for the bracket mechanism 7. It is located on the outside of the weighbridge 1, providing stable support for the entire bracket mechanism 7. The outside of the base 71 is located on the outside of the liquid storage tank 2. The reasonable layout does not occupy the material feeding operation space and facilitates the operator to replace the liquid storage tank 2. A liquid receiving frame 72 is fixedly connected to the top of the base 71. The liquid receiving frame 72 is used to hold the residual additive in the liquid extraction tube 31 to prevent residual liquid from dripping and contaminating the ground. A guide channel 73 is fixedly connected inside the liquid receiving frame 72. The guide channel 73 can guide the residual liquid to quickly converge, which is convenient for centralized collection and reuse, avoiding material waste. A bracket 74 is fixedly connected to the top of the base 71. The bracket 74 provides an installation carrier for the constraint component 75, ensuring the stability of the constraint component 75. The constraint component 75 is set on the outside of the bracket 74. The constraint component 75 is used to fix the temporarily stored liquid extraction tube 31 to prevent the liquid extraction tube 31 from slipping or tipping over, ensuring operational safety.

[0047] Please refer to Figure 6. The constraint assembly 75 includes a slider 751. The inner side of the slider 751 is slidably connected to the outer side of the bracket 74. The slider 751 can slide up and down along the bracket 74 to adapt to the fixing requirements of different lengths of suction tubes 31. Two external top plates 752 are fixedly connected to the outer side of the slider 751. The two external top plates 752 are symmetrically arranged to provide stable installation support for the hand clamp 754. Limiting plates 753 are fixedly connected to the outer side of each of the two external top plates 752. The limiting plates 753 are used to limit the rotation range of the hand clamp 754 to ensure that the hand clamp 754 is always at a reasonable clamping angle. The limiting plate 753 is rotatably connected to a hand clamp 754 on its outer side. The hand clamp 754 can be opened and closed flexibly to facilitate quick clamping and release of the suction tube 31. A spring 755 is provided on the outer side of the hand clamp 754. The spring 755 provides a continuous elastic clamping force to the hand clamp 754, ensuring that the hand clamp 754 tightly clamps the suction tube 31. One end of the spring 755 abuts against the outer side of the hand clamp 754, and the other end of the spring 755 abuts against the outer side of the external top plate 752. The bidirectional abutment ensures that the elastic force of the spring 755 is stably transmitted, preventing the hand clamp 754 from loosening, and at the same time adapting to suction tubes 31 of different diameters.

[0048] Please refer to Figures 1-8. The storage tank 2 containing the additive is placed on the base plate 61 using a forklift. Forklift transportation is convenient and efficient, and the replacement and placement of the storage tank 2 can be completed quickly. The positioning baffle 62 on the base plate 61 guides the storage tank 2 to automatically slide into the center position of the base plate 61. The guiding function of the positioning baffle 62 does not require manual adjustment, saving operation time. At the same time, it ensures that the storage tank 2 is placed in the center. The centrally positioned storage tank 2 can ensure that the weighing force of the weighing scale 1 is uniform, improve the accuracy of the weighing data, and lay the foundation for subsequent quantitative feeding.

[0049] The total weight of the storage tank 2 and its internal liquid is collected in real time by the weighbridge 1 after positioning. The remaining amount of additive and the amount of additive added can be dynamically viewed in real time. The suction pipe 31 is inserted into the storage tank 2. The insertion depth of the suction pipe 31 can be flexibly adjusted by the positioning plate 32 to adapt to additives with different liquid levels. The position of the positioning plate 32 on the outside of the suction pipe 31 is adjusted according to the height of the opening of the storage tank 2 to ensure a tight seal. Then, the locking bolt 34 is rotated to fix it. The locking bolt 34 is locked firmly to prevent the positioning plate 32 from shifting, so that the suction pipe 31 is sealed and fixed at the opening of the storage tank 2. The sealed connection avoids air leakage during liquid extraction, which may cause insufficient negative pressure and prevent additive leakage. At the same time, the bottom of the suction pipe 31 is suspended above the bottom of the storage tank 2 to prevent the suction pipe 31 from sticking to the bottom of the tank and to ensure smooth and uninterrupted liquid extraction. The connected suction pipe 31 is stable and can ensure the stability of the subsequent transportation process without leakage or air leakage.

[0050] Adjust the three-way valve 8 to connect the gear pump 4 to the pipeline of the reactor 5. The three-way valve 8 allows for flexible switching and quick connection of the feeding channel. Start the gear pump 4. The gear pump 4 outputs stable power to ensure uniform additive delivery speed and avoids feeding too fast or too slow, which would affect the quantitative accuracy. The liquid in the storage tank 2 is drawn through the connected liquid extraction pipe 31. The V-groove design of the liquid extraction pipe 31 ensures smooth liquid extraction without jamming. The liquid is then transported to the reactor 5 through the pipeline assembly 3. The pipeline assembly 3 has excellent sealing performance to prevent the additive from leaking or contaminating during transportation.

[0051] Check the weight shown on the weighbridge 1. The weighbridge 1 displays the weight data in real time, which helps operators to accurately control the amount of material added. When the required dosage is reached, turn off the gear pump 4 and the back pressure valve 10. Quickly closing the valve can prevent over-addition and ensure quantitative accuracy. The back pressure valve 10 cuts off the liquid column in the pipeline to prevent the residual additive in the pipeline from continuing to drip into the reactor 5 due to gravity, further improving the quantitative accuracy. Adjust the three-way valve 8 to connect the air pump 9 to the pipeline of the reactor 5 and quickly switch to the purging path to improve work efficiency. Turn on the air pump 9 to introduce compressed air into the pipeline. The compressed air pressure is stable and removes the residue in the pipeline. Use the airflow to blow all the residual liquid in the pipeline into the reactor 5 to avoid waste of additive residue and prevent cross-contamination between different batches of additives.

[0052] When replacing the storage tank 2, the extraction pipe 31 is removed from the opening of the old storage tank 2. This is convenient and saves time. The extraction pipe 31 is placed on the bracket mechanism 7 with the opening facing down. This allows residual additives to flow out under gravity, preventing residual liquid from accumulating. The extraction pipe 31 is fixed by the constraint component 75. The elastic clamp of the constraint component 75 can be adapted to extraction pipes 31 of different diameters, ensuring a firm fixation and preventing slippage. The residual additives in the extraction pipe 31 fall into the receiving frame 72 under gravity. The receiving frame 72 can fully collect the residual liquid, preventing dripping and contamination. The liquid is then guided and collected by the guide channel 73 and added to the reaction vessel 5. This collection facilitates the recovery of residual liquid, ensuring accurate addition to the reaction vessel 5, avoiding material waste, and maintaining a clean working environment.

Claims

1. A precise quantitative feeding device for additives used in antifreeze production, comprising a weighing scale (1), characterized in that, The weighing scale (1) is provided with a protective mechanism (6) at its top. A liquid storage tank (2) is placed on the protective mechanism (6). A bracket mechanism (7) is provided on the outside of the liquid storage tank (2). A pipe assembly (3) is provided on the outside of the opening of the liquid storage tank (2). A gear pump (4) is connected to the outlet end of the pipe assembly (3). A three-way valve (8) is provided on the outside of the gear pump (4). An air pump (9) is provided on the outside of the three-way valve (8). A back pressure valve (10) is provided on the outside of the three-way valve (8). A reaction vessel (5) is provided on the outside of the back pressure valve (10). The pipe assembly (3) includes a liquid extraction pipe (31). A positioning plate (32) is slidably connected to the outside of the liquid extraction pipe (31). A locking ring (33) is fixedly connected to the bottom end of the positioning plate (32).

2. The precise quantitative feeding device for additives used in antifreeze production according to claim 1, characterized in that, The protective mechanism (6) includes a base plate (61), and a plurality of fixing plates (63) are fixedly connected to the bottom end of the base plate (61). A rubber pad (65) is provided at the bottom end of each of the fixing plates (63). An I-shaped block (64) is fixedly connected to the outside of the rubber pad (65). The outside of the fixing plate (63) is located at the top of the weighbridge (1).

3. The precise quantitative feeding device for additives used in antifreeze production according to claim 1, characterized in that, The bracket mechanism (7) includes a base (71), the outer side of which is located on the outer side of the liquid storage tank (2). A liquid receiving frame (72) is fixedly connected to the top of the base (71), and a flow guide groove (73) is fixedly connected inside the liquid receiving frame (72). A bracket (74) is fixedly connected to the top of the base (71), and a constraint component (75) is provided on the outer side of the bracket (74).

4. The precise quantitative feeding device for additives used in antifreeze production according to claim 3, characterized in that, The constraint assembly (75) includes a slider (751), the inner side of which is slidably connected to the outer side of the bracket (74). Two external top plates (752) are fixedly connected to the outer side of the slider (751). Limiting plates (753) are fixedly connected to the outer sides of the two external top plates (752). A hand clamp (754) is rotatably connected to the outer side of the limiting plate (753). A spring (755) is provided on the outer side of the hand clamp (754).

5. The precise quantitative feeding device for additives used in antifreeze production according to claim 4, characterized in that, One end of the spring (755) abuts against the outside of the hand clamp (754), and the other end of the spring (755) abuts against the outside of the external top plate (752).

6. The precise metering device for additives used in antifreeze production according to claim 1, characterized in that, The liquid extraction end of the extraction pipe (31) is provided with multiple V-shaped grooves to prevent the liquid extraction end of the extraction pipe (31) from sticking to the bottom of the storage tank (2).

7. The precise quantitative feeding device for additives used in antifreeze production according to claim 1, characterized in that, The outer side of the opening of the liquid storage tank (2) is threaded to the inner side of the locking ring (33), and the inner side of the positioning plate (32) is threaded to two locking bolts (34).

8. The precise quantitative feeding device for additives used in antifreeze production according to claim 2, characterized in that, The bottom end of the fixed plate (63) is provided with a shock-absorbing spring (66) for buffering and protecting the weighbridge (1).

9. The precise quantitative feeding device for additives used in antifreeze production according to claim 2, characterized in that, The top of the base plate (61) is fixedly connected to a positioning baffle (62) for guiding the liquid storage tank (2) to automatically slide into the center position of the weighing scale (1).

10. A process for a precise metering device for additives used in antifreeze production, characterized in that, A precise quantitative feeding device for additives used in antifreeze production, applicable to any one of claims 1-9, comprises the following steps: placing a storage tank (2) containing additives onto a base plate (61) using a forklift; a positioning baffle (62) on the base plate (61) guides the storage tank (2) to automatically slide into the center of the base plate (61) to obtain a storage tank (2) after positioning; collecting the total weight of the storage tank (2) and its internal liquid in real time using a weighbridge (1); inserting a suction pipe (31) into the storage tank (2); adjusting the position of the positioning plate (32) on the outside of the suction pipe (31); and then rotating the locking bolt (34) to fix the suction pipe (31) so that it is sealed and fixed at the mouth of the storage tank (2), while the bottom of the suction pipe (31) is suspended above the bottom of the storage tank (2) to obtain a connected suction pipe (31); adjusting the three-way valve (8) to connect the gear pump (4) to the reaction vessel (5) and start the pump. The gear pump (4) draws liquid from the storage tank (2) through the connected suction pipe (31) and transports it to the reactor (5) through the pipeline assembly (3); check the weight shown on the scale (1), and when the dosage reaches the required dosage, close the gear pump (4) and the back pressure valve (10), the back pressure valve (10) cuts off the liquid column in the pipeline, adjust the three-way valve (8) to connect the air pump (9) to the pipeline of the reactor (5), turn on the air pump (9) to introduce compressed air into the pipeline, and use the... The airflow blows all the residual liquid in the pipe into the reactor (5); when the storage tank (2) is replaced, the liquid extraction pipe (31) is removed from the opening of the old storage tank (2), and the liquid extraction pipe (31) is placed on the bracket mechanism (7) with the pipe opening facing down. The liquid extraction pipe (31) is fixed by the constraint component (75). The additives remaining in the liquid extraction pipe (31) fall into the liquid receiving frame (72) under the action of gravity, and are guided and collected by the guide channel (73) and added to the reactor (5).

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