Vacuum air path system of a flat tube sizing machine

Abstract

The present application relates to a kind of vacuum air path systems of flat tube sizing machine, including forming die, air path integrated block, vacuum pump, water-gas separator and main control system, the forming die is equipped with multiple independent air extraction branch, multiple independent air extraction branch is connected with air path integrated block by partition vacuum closed loop control module, vacuum sensor is equipped on the main air path of air path integrated block;Air path integrated block is equipped with physically isolated independent air cavity and independent water cavity, the independent air cavity is connected with partition vacuum closed loop control module, the independent water cavity is connected with the cooling inlet and outlet water pipe of forming die;The air outlet end of air path integrated block is connected with oil smoke filter, the air outlet end of oil smoke filter is communicated with the air inlet of vacuum pump, the exhaust port of vacuum pump is communicated with water-gas separator;The water inlet of vacuum pump is connected with water supply equipment;Partition vacuum closed loop control module and vacuum sensor are electrically connected with main control system.

Description

Technical Field

[0001] This invention relates to the field of plastic product manufacturing equipment, and more specifically, to a vacuum circuit system for a flat tube sizing machine. Background Technology

[0002] In the extrusion molding process of profiled flat tubes, vacuum sizing and cooling is the core process to ensure the dimensional accuracy, surface flatness, and wall thickness uniformity of the flat tubes. It directly determines the quality of the finished flat tubes and the production qualification rate. After extrusion molding, the flat tubes need to be vacuum adsorption cooled and shaped by a sizing machine so that the outer wall of the tube in the high-temperature molten state fits tightly against the inner cavity of the sizing mold. This, combined with the cooling system, completes rapid cooling and shaping, and is an indispensable key link in the extrusion production of flat tubes.

[0003] Currently, flat tube sizing machines in the industry generally adopt a direct-extraction vacuum air path system. This system mainly consists of core components such as a shaping mold, a gas integration block, a vacuum pump, and a water vapor separator. Its conventional air path flow is: atmosphere → shaping mold → gas integration block → vacuum pump → water vapor separator → atmosphere. This traditional air path structure directly extracts air from inside the shaping mold to form a negative pressure through a vacuum pump. The negative pressure adsorption effect is used to achieve flat tube bonding and shaping. The overall structure is simple and compact, the equipment modification and investment costs are low, and the assembly and debugging are convenient. It can meet the basic flat tube shaping production needs and is therefore widely used in small and medium-sized flat tube extrusion production lines.

[0004] However, as the production requirements for flat tube profiles in terms of dimensional accuracy, flatness, and wall thickness uniformity continue to increase, and as long-term continuous production conditions become more widespread, the inherent defects of the aforementioned direct-extraction vacuum circuit structure have gradually become apparent, seriously restricting the improvement of flat tube product quality and the stable operation of the production line. Specifically, the following technical drawbacks exist:

[0005] First, the vacuum level control accuracy is poor, resulting in insufficient stability of product molding quality. Traditional air circuits use a uniform direct vacuum pump operation mode. However, there are objective differences in the pipe length, bending angle, and flow resistance at each evacuation point inside the molding die. During the uniform evacuation process, significant vacuum level deviations occur in different areas of the mold cavity. Furthermore, this structure lacks independent zoned pressure regulation and stabilization, making it impossible to precisely differentiate the vacuum level in different areas of the mold cavity according to the flat tube molding requirements. This leads to uneven adsorption and bonding forces in different parts during the flat tube molding process, which easily results in quality defects such as wall thickness deviation, board warping, and unevenness, significantly increasing the product defect rate and failing to meet the needs of large-scale production of high-precision flat tubes.

[0006] Secondly, the vacuum system has weak anti-interference ability and poor operational stability. In the existing structure, the negative pressure value of the forming mold cavity depends entirely on the operating conditions of the vacuum pump, without any negative pressure buffer or pressure stabilization compensation structure. During long-term continuous production, the vacuum pump is prone to mechanical failures such as impeller wear and operating speed fluctuations. At the same time, the airflow drawn by the gas path is prone to carrying condensed water vapor, resulting in water in the vacuum pump intake. The above-mentioned fluctuations in operating conditions and failure problems will directly and synchronously disturb the vacuum degree of the forming mold cavity, causing frequent fluctuations in vacuum pressure, further damaging the stability of flat tube forming, and causing batch product quality problems.

[0007] Finally, vacuum pumps are prone to corrosion and damage, resulting in short equipment lifespans and high maintenance costs. Traditional direct-pump gas paths rely solely on end-of-line water vapor separators for water vapor separation. A large amount of condensed water vapor generated during the cooling process directly enters the vacuum pump with the airflow, unable to be effectively intercepted at the front end. Over long-term operation, this water vapor causes corrosion and scale buildup in the impeller, chamber, bearings, and other metal components inside the vacuum pump. This not only reduces pumping efficiency and affects vacuum stability but also accelerates wear and aging, significantly shortening the pump's lifespan and increasing maintenance, replacement, and downtime costs, severely impacting continuous and efficient production line operations.

[0008] Therefore, it is necessary to propose a vacuum air path system for a flat tube sizing machine that solves the above problems. Summary of the Invention

[0009] To overcome at least one of the defects (deficiencies) of the prior art, the present invention provides a vacuum air circuit system for a flat tube sizing machine.

[0010] To solve the above-mentioned technical problems, the technical solution of the present invention is as follows: a vacuum air path system for a flat tube sizing machine, comprising a forming mold, an air path integrated block, a vacuum pump, a water-air separator, and a main control system;

[0011] The molding die is provided with multiple independent air extraction branches, which are connected to the gas path integration block through a partitioned vacuum closed-loop control module. A vacuum sensor is provided on the main gas path of the gas path integration block.

[0012] The gas path integration block is equipped with physically isolated independent air chambers and independent water chambers. The independent air chambers are connected to the partitioned vacuum closed-loop control module, and the independent water chambers are connected to the cooling inlet and outlet water pipes of the molding mold.

[0013] The air outlet of the gas circuit integrated block is connected to the oil fume filter, the air outlet of the oil fume filter is connected to the air inlet of the vacuum pump, and the exhaust port of the vacuum pump is connected to the water-gas separator.

[0014] The inlet of the vacuum pump is connected to the water supply equipment;

[0015] The partitioned vacuum closed-loop control module and vacuum sensor are both electrically connected to the main control system. By providing multiple independent suction branches on the molding die, and connecting these branches to the gas path integration block via the partitioned vacuum closed-loop control module, the vacuum level can be precisely controlled for different areas, improving anti-interference capabilities. Furthermore, the gas path integration block features physically isolated independent gas and water chambers, allowing for high integration of multiple gas and water path connectors, centralized pipeline arrangement, and a neat overall pipeline layout, facilitating maintenance and repair. Furthermore, water vapor is separated by a water-air separator and then recovered and discharged separately, realizing the recycling of water resources. This invention abandons the traditional integrated direct exhaust air circuit. Each molding die's exhaust branch is equipped with an independent zoned vacuum closed-loop control module. When the vacuum degree of a single branch deviates from the set range, the main control system drives the corresponding zoned vacuum closed-loop control module to replenish the atmosphere and precisely fine-tune the negative pressure of that branch. This achieves closed-loop independent pressure regulation of each molding die's exhaust circuit, eliminating air pressure coupling interference between multiple mold cavities. The consistency of dimensional accuracy and the continuity of production during flat tube production are significantly improved.

[0016] Furthermore, the partitioned vacuum closed-loop control module is a vacuum proportional valve, which is equipped with a quick connector. In practical applications, other devices can be used to replace the vacuum proportional valve, all of which are alternatives that are easy for those skilled in the art to conceive of. The quick connector facilitates quick installation and connection.

[0017] Furthermore, the independent water chamber is equipped with an inlet solenoid valve, an inlet ball valve, a first inlet tower, and a second inlet tower. The second inlet tower is equipped with a condensate inlet filter. The inlet solenoid valve and the inlet ball valve facilitate the control of the water inlet flow, while the first and second inlet towers are convenient for water intake, and the condensate inlet filter is used to filter condensate.

[0018] Furthermore, the fume filter includes a fume filter tank, a silencer, an oil sight glass, an upper oil drain ball valve, a lower oil drain ball valve, a PP cotton filter element, and a gas guide plate;

[0019] The fume filter canister is equipped with a sealing cover, and the silencer is installed on the sealing cover and connected to the fume filter canister.

[0020] The PP cotton filter element and the gas guide plate are arranged sequentially from top to bottom inside the oil fume filter canister;

[0021] The oil sight glass, the upper oil drain ball valve, and the lower oil drain ball valve are respectively installed on the oil fume filter tank;

[0022] The air inlet of the fume filter canister is connected to the air outlet of the gas circuit integrated block, and the air outlet of the fume filter canister is connected to the air inlet of the vacuum pump. With the setting of PP cotton filter element and gas guide plate, when the airflow passes through, plastic oil fumes and molten plastic microparticles are intercepted by PP cotton filter element, and oil mist is condensed by collision with the guide plate. The oil layer formed is stored in the upper layer of the canister, while the lower layer discharges clean gas. The combination of the two effectively ensures that the vacuum pump continuously draws air from the pipeline to form a stable negative pressure. The setting of silencer can reduce the noise generated by the fume filter canister during operation. The setting of oil sight glass, upper oil drain ball valve and lower oil drain ball valve can facilitate the observation and discharge control of oil volume.

[0023] Furthermore, the pore diameter of the PP cotton filter element is less than 5 micrometers. In actual use, the pore diameter of the PP cotton filter element can be set as needed, and these are all alternative solutions that are easy for those skilled in the art to conceive of.

[0024] Furthermore, the water supply equipment is a constant pressure water pump. In practical applications, when the floor height of the factory building is insufficient, a constant pressure water pump can be used to replace the water tank for water supply.

[0025] Furthermore, the water supply equipment is a water tank. In this invention, the height of the water tank is more than 3m, which can enhance the water pressure.

[0026] Furthermore, the water tank includes a water tank body, an inlet filter, a stainless steel pipe, a pagoda connector, an overflow pipe, a transparent acrylic pipe, an inlet pipe, a sealing plate, and a pull rod;

[0027] The water tank body is connected to a stainless steel pipe via a pagoda connector, and the stainless steel pipe is located on the outside of the molding mold.

[0028] The inlet filter is mounted on a stainless steel pipe, the inlet pipe is installed inside the stainless steel pipe, and the inlet pipe is connected to the inlet filter.

[0029] The transparent acrylic tube and the overflow tube are respectively installed inside the water tank body, and the installation height of the overflow tube is higher than that of the transparent acrylic tube.

[0030] The sealing plate is located on the outside of the water tank body, and the pull rod is located on the sealing plate. The water inlet filter can filter the water entering the water tank body. In practical applications, the height of the stainless steel pipe can be set to more than 3 meters to facilitate water pressure control. Since the water inlet pipe is located inside the stainless steel pipe, it can be protected. Since the height of the overflow pipe is higher than the height of the transparent acrylic pipe, it can overflow when the water in the water tank body is too full. The sealing plate and pull rod protect the water tank body.

[0031] Furthermore, the gas path integration block has a layered structure, with the independent gas chamber located on the upper layer and the independent water chamber located on the middle layer. By setting the gas path integration block into a layered structure, and with the independent gas chamber located on the upper layer and the independent water chamber located on the middle layer, the pipelines can be arranged in a concentrated manner, which is convenient for inspection and maintenance.

[0032] Compared with the prior art, the beneficial effects of the technical solution of the present invention are:

[0033] The vacuum air path system of the flat tube sizing machine disclosed in this invention features multiple independent suction branches on the forming mold, which are connected to the air path integration block via a zoned vacuum closed-loop control module. This allows for precise control of vacuum levels in different areas and improves anti-interference capabilities. Furthermore, the air path integration block includes physically isolated independent air and water chambers, enabling highly integrated multi-way air and water connectors, centralized pipeline arrangement, and a neat overall pipeline layout, facilitating inspection and maintenance. After water vapor is separated by a water vapor separator, it is recovered and discharged separately, realizing the recycling of water resources. This invention abandons the traditional integrated direct exhaust air circuit. Each molding die's exhaust branch is equipped with an independent zoned vacuum closed-loop control module. When the vacuum degree of a single branch deviates from the set range, the main control system drives the corresponding zoned vacuum closed-loop control module to replenish the atmosphere and precisely fine-tune the negative pressure of the branch. This realizes closed-loop independent pressure regulation of each molding die's exhaust circuit, eliminating air pressure coupling interference between multiple mold cavities. The dimensional accuracy consistency and production continuity during flat tube production are significantly improved. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the vacuum air path system of the flat tube sizing machine in this invention.

[0035] Figure 2 This is a schematic diagram of the vacuum air path system of the flat tube sizing machine in this invention.

[0036] Figure 3 This is a schematic diagram of the internal structure of the gas path integrated block in this invention.

[0037] Figure 4 This is a schematic diagram of the structure of the oil fume filter in this invention.

[0038] Figure 5 This is a schematic diagram of the water supply equipment in this invention.

[0039] In the diagram, 1 is the molding mold, 2 is the air circuit integrated block, 3 is the vacuum pump, 4 is the water-air separator, 5 is the main control system, 6 is the vacuum sensor, 7 is the independent air chamber, 8 is the independent water chamber, 9 is the oil fume filter, 10 is the water supply equipment, 11 is the vacuum proportional valve, 12 is the PP cotton filter element, 13 is the gas guide plate, 14 is the water inlet pipe, 15 is the overflow pipe, 16 is the quick connector, 17 is the oil fume filter tank, 18 is the silencer, 19 is the oil sight glass, 20 is the upper oil drain ball valve, 21 is the lower oil drain ball valve, 22 is the sealing cover plate, 23 is the water tank body, 24 is the water inlet filter, 25 is the stainless steel pipe, 26 is the pagoda connector, 27 is the transparent acrylic tube, 28 is the sealing plate, 29 is the pull rod, 30 is the water inlet solenoid valve, 31 is the water inlet ball valve, 32 is the first water inlet pagoda, 33 is the second water inlet pagoda, and 34 is the condensate water inlet filter. Detailed Implementation

[0040] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this patent. To better illustrate this embodiment, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. The technical solution of this invention will be further described below with reference to the accompanying drawings and embodiments.

[0042] like Figure 1-5As shown, a vacuum air path system for a flat tube sizing machine includes a forming mold 1, an air path integration block 2, a vacuum pump 3, a water-air separator 4, and a main control system 5. The forming mold 1 has multiple independent air extraction branches, which are connected to the air path integration block 2 via a zoned vacuum closed-loop control module. A vacuum sensor 6 is installed on the main air path of the air path integration block 2. The air path integration block 2 has physically isolated independent air chambers 7 and 8. The independent air chamber 7 is connected to the zoned vacuum closed-loop control module, and the independent water chamber 8 is connected to the cooling water inlet and outlet pipes of the forming mold 1. The air outlet of the air path integration block 2 is connected to an oil fume filter 9, the air outlet of the oil fume filter 9 is connected to the air inlet of the vacuum pump 3, and the exhaust port of the vacuum pump 3 is connected to the water-air separator 4. The water inlet of the vacuum pump 3 is connected to a water supply device 10. The zoned vacuum closed-loop control module and the vacuum sensor 6 are both electrically connected to the main control system 5. The forming mold 1 has multiple independent air extraction branches, and the multiple air extraction branches... Independent air extraction branches are connected to the gas path integration block 2 via a zoned vacuum closed-loop control module. Therefore, the vacuum level can be precisely controlled for different areas, and the anti-interference capability is improved. In addition, by providing physically isolated independent air chambers 7 and independent water chambers 8 on the gas path integration block 2, multiple air and water connection points can be highly integrated, pipelines are centrally arranged, the overall pipeline layout is neat, and maintenance is convenient. Furthermore, water vapor is separated by the water-air separator 4 and then recovered and discharged separately, realizing the recycling of water resources. This invention abandons the traditional integrated direct air extraction circuit. Each forming mold 1's air extraction branch is equipped with an independent zoned vacuum closed-loop control module. When the vacuum level of a single branch deviates from the set range, the main control system 5 drives the corresponding zoned vacuum closed-loop control module to replenish the atmosphere and precisely fine-tune the negative pressure of the branch. This achieves closed-loop independent pressure regulation of the air extraction circuit of each forming mold 1, eliminating air pressure coupling interference between multiple mold cavities. The dimensional accuracy consistency and production continuity during flat tube production are significantly improved.

[0043] In this invention, the partitioned vacuum closed-loop control module is a vacuum proportional valve 11, which is equipped with a quick connector 16. In practical applications, other devices can be used to replace the vacuum proportional valve 11, all of which are alternatives that are easy for those skilled in the art to conceive of. The quick connector 16 facilitates quick installation and connection. In this invention, an inlet solenoid valve 30, an inlet ball valve 31, a first inlet tower 32, and a second inlet tower 33 are provided on the independent water chamber. The second inlet tower 33 is equipped with a condensate inlet filter 34. The inlet solenoid valve 30 and the inlet ball valve 31 facilitate the control of the water inlet volume, while the first inlet tower 32 and the second inlet tower 33 are convenient for water inlet, and the condensate inlet filter 34 is used to filter condensate.

[0044] In this invention, the fume filter 9 includes a fume filter canister 17, a silencer 18, an oil sight glass 19, an upper oil drain ball valve 20, a lower oil drain ball valve 21, a PP cotton filter element 12, and a gas guide plate 13. A sealing cover 22 is provided on the fume filter canister 17, and the silencer 18 is installed on the sealing cover 22 and communicates with the fume filter canister 17. The PP cotton filter element 12 and the gas guide plate 13 are arranged sequentially from top to bottom inside the fume filter canister 17. The oil sight glass 19, the upper oil drain ball valve 20, and the lower oil drain ball valve 21 are respectively installed on the fume filter canister 17. The air inlet of the fume filter canister 17 is connected to the air outlet of the gas path integrated block 2. The exhaust end of the fume filter canister 17 is connected to the air inlet of the vacuum pump 3. With the PP cotton filter element 12 and the gas guide plate 13, when the airflow passes through, plastic oil fumes and molten plastic microparticles are intercepted by the PP cotton filter element, and the oil mist is condensed by the collision of the guide plate. The oil layer formed is stored in the upper layer of the canister, while the lower layer discharges clean gas. The combination of the two effectively ensures that the vacuum pump continuously draws air from the pipeline to form a stable negative pressure. The silencer 18 can reduce the noise generated by the fume filter canister 17 during operation. The oil sight glass 19, the upper oil drain ball valve 20 and the lower oil drain ball valve 21 can facilitate the observation and discharge control of the oil volume.

[0045] The PP cotton filter element 12 has a pore diameter of less than 5 micrometers. In practical use, the pore diameter of the PP cotton filter element 12 can be set as needed. These are all alternative solutions that are easily conceived by those skilled in the art. In this invention, the water supply device 10 can be a constant pressure water pump. In practical applications, when the factory floor height is insufficient, a constant pressure water pump can be used to replace the water tank for water supply. In addition, the water supply device 10 can also be a water tank. In this invention, the height of the water tank is more than 3 meters, which can enhance the water pressure. In this invention, the water tank... The system includes a water tank body 23, an inlet filter 24, a stainless steel pipe 25, a pagoda connector 26, an overflow pipe 15, a transparent acrylic pipe 27, an inlet pipe 14, a sealing plate 28, and a pull rod 29. The water tank body 23 is connected to the stainless steel pipe 25 via the pagoda connector 26, and the stainless steel pipe 25 is located on the outside of the molding mold 1. The inlet filter 24 is installed on the stainless steel pipe 25, and the inlet pipe 14 is installed inside the stainless steel pipe 25 and connected to the inlet filter 24. The transparent acrylic pipe 27 and the overflow pipe 15 are respectively installed inside the water tank body 23, and the overflow pipe 15 is connected to the inlet filter 24. The installation height of pipe 15 is higher than that of transparent acrylic pipe 27; the sealing plate 28 is set on the outside of the water tank body 23, and the pull rod 29 is set on the sealing plate 28. The inlet filter 24 filters the water entering the water tank body 23. In practical applications, the height of stainless steel pipe 25 can be set above 3 meters to facilitate water pressure control. Since the inlet pipe 14 is set inside the stainless steel pipe 25, it can be protected. Because the height of overflow pipe 15 is higher than that of transparent acrylic pipe 27... The height of 7 allows for overflow when the water in the tank body 23 is too full. The sealing plate 28 and the pull rod 29 protect the tank body 23. In this invention, the air circuit integrated block 2 has a layered structure, with the independent air chamber 7 located on the upper layer and the independent water chamber 8 located on the middle layer. By setting the air circuit integrated block 2 as a layered structure, with the independent air chamber 7 on the upper layer and the independent water chamber 8 on the middle layer, the pipelines can be arranged in a concentrated manner, which is convenient for inspection and maintenance.

[0046] Example

[0047] In this embodiment, the molding mold has multiple independent exhaust branches, which are connected to the gas path integration block via a partitioned vacuum closed-loop control module. A vacuum sensor is installed on the main gas path of the gas path integration block. The gas path integration block also has physically isolated independent air chambers and independent water chambers. The independent air chambers are connected to the partitioned vacuum closed-loop control module, and the independent water chambers are connected to the cooling water inlet and outlet pipes of the molding mold. The exhaust end of the gas path integration block is connected to an oil fume filter, and the exhaust end of the oil fume filter is connected to the air inlet of a vacuum pump. The exhaust port of the vacuum pump is connected to a water-air separator, and the water inlet of the vacuum pump is connected to a water supply device. Both the partitioned vacuum closed-loop control module and the vacuum sensor are electrically connected to the main control system. By providing multiple independent exhaust branches on the molding mold and connecting them to the gas path integration block via the partitioned vacuum closed-loop control module, this system effectively addresses the issue of air leakage. Therefore, the vacuum level can be precisely controlled for different areas, and the anti-interference capability is improved. In addition, by setting up physically isolated independent air chambers and independent water chambers on the gas circuit integration block, multiple gas circuit connectors and water circuit connectors can be highly integrated, pipelines are centrally arranged, the overall pipeline layout is neat, and maintenance is convenient. Furthermore, water vapor is separated by a water-gas separator and then recovered and discharged separately, realizing the recycling of water resources. This invention abandons the traditional integrated direct suction gas circuit. Each forming mold's suction branch is equipped with an independent zoned vacuum closed-loop control module. When the vacuum level of a single branch deviates from the set range, the main control system drives the corresponding zoned vacuum closed-loop control module to replenish the atmosphere and precisely fine-tune the negative pressure of that branch. This achieves closed-loop independent pressure regulation of each forming mold's suction circuit, eliminating air pressure coupling interference between multiple mold cavities. The dimensional accuracy consistency and production continuity during flat tube production are significantly improved.

[0048] The positional relationships described in the figures are for illustrative purposes only and should not be construed as limiting this patent. Clearly, the above embodiments of the present invention are merely examples to clearly illustrate the invention and are not intended to limit the implementation of the invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of this invention.

Claims

1. A vacuum air path system for a flat tube sizing machine, comprising a forming mold, an air path integrated block, a vacuum pump, a water-air separator, and a main control system, characterized in that: The molding die is provided with multiple independent air extraction branches, which are connected to the gas path integration block through a partitioned vacuum closed-loop control module. A vacuum sensor is provided on the main gas path of the gas path integration block. The gas path integration block is equipped with physically isolated independent air chambers and independent water chambers. The independent air chambers are connected to the partitioned vacuum closed-loop control module, and the independent water chambers are connected to the cooling inlet and outlet water pipes of the molding mold. The air outlet of the gas circuit integrated block is connected to the oil fume filter, the air outlet of the oil fume filter is connected to the air inlet of the vacuum pump, and the exhaust port of the vacuum pump is connected to the water-gas separator. The inlet of the vacuum pump is connected to the water supply equipment; Both the partitioned vacuum closed-loop control module and the vacuum sensor are electrically connected to the main control system.

2. The vacuum air path system of the flat tube sizing machine according to claim 1, characterized in that: The partitioned vacuum closed-loop control module is a vacuum proportional valve, and the vacuum proportional valve is equipped with a quick connector.

3. The vacuum air path system of the flat tube sizing machine according to claim 1, characterized in that: The independent water chamber is equipped with an inlet solenoid valve, an inlet ball valve, a first inlet tower, and a second inlet tower. The second inlet tower is equipped with a condensate inlet filter.

4. The vacuum air path system of the flat tube sizing machine according to claim 1, characterized in that: The fume filter includes a fume filter tank, a silencer, an oil sight glass, an upper oil drain ball valve, a lower oil drain ball valve, a PP cotton filter element, and a gas guide plate; The fume filter canister is equipped with a sealing cover, and the silencer is installed on the sealing cover and connected to the fume filter canister. The PP cotton filter element and the gas guide plate are arranged sequentially from top to bottom inside the oil fume filter canister; The oil sight glass, the upper oil drain ball valve, and the lower oil drain ball valve are respectively installed on the oil fume filter tank; The air inlet of the fume filter canister is connected to the air outlet of the air circuit integrated block, and the air outlet of the fume filter canister is connected to the air inlet of the vacuum pump.

5. The vacuum air path system of the flat tube sizing machine according to claim 3, characterized in that: The PP cotton filter element has a pore diameter of less than 5 micrometers.

6. The vacuum air path system of the flat tube sizing machine according to claim 1, characterized in that: The water supply equipment is a constant pressure water pump.

7. The vacuum air path system of the flat tube sizing machine according to claim 1, characterized in that: The water supply equipment is a water tank.

8. The vacuum air path system of the flat tube sizing machine according to claim 7, characterized in that: The water tank includes a water tank body, an inlet filter, a stainless steel pipe, a pagoda connector, an overflow pipe, a transparent acrylic pipe, an inlet pipe, a sealing plate, and a pull rod; The water tank body is connected to a stainless steel pipe via a pagoda connector, and the stainless steel pipe is located on the outside of the molding mold. The inlet filter is mounted on a stainless steel pipe, the inlet pipe is installed inside the stainless steel pipe, and the inlet pipe is connected to the inlet filter. The transparent acrylic tube and the overflow tube are respectively installed inside the water tank body, and the installation height of the overflow tube is higher than that of the transparent acrylic tube. The sealing plate is located on the outside of the water tank body, and the pull rod is located on the sealing plate.

9. The vacuum air circuit system of the flat tube sizing machine according to claim 1, characterized in that: The gas path integration block has a layered structure, with the independent gas chamber located in the upper layer and the independent water chamber located in the middle layer.

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