An automated packaging machine for chemical production

Abstract

This invention discloses an automated packaging machine for chemical production, belonging to the field of chemical packaging equipment. The device includes a filling assembly, a filling machine, a sealing machine, and a filling and sealing working chamber. The sealed working chamber is equipped with a filling station, a replenishment station, and a capping station. A conveying mechanism is mounted on the sealed working chamber. The filling assembly is detachably and sealed to the container opening. The filling assembly includes a filling connection part, a filling reservoir, and a lifting pipe. The top of the filling connection part is connected to the filling reservoir and has an inflation inlet and an exhaust outlet. The top of the lifting pipe is axially and slidably sealed and connected to the bottom of the filling connection part, and a first return spring is sleeved between them. This invention, through the design of the filling assembly, achieves continuous sealing of the container opening throughout the filling process and decouples the coarse and fine filling processes, overcoming the bottleneck of efficiency and accuracy constraints. It has the advantage of balancing filling efficiency and metering accuracy.

Description

Technical Field

[0001] This invention relates to the field of chemical packaging equipment technology, specifically to an automated packaging machine for volatile chemical liquid raw materials, which is particularly suitable for the integrated filling and sealing of flammable and volatile liquids such as methyl acetate, ethyl acetate, and acetone. Background Technology

[0002] Volatile organic chemical liquid raw materials such as methyl acetate, ethyl acetate, and acetone are widely used in coatings, adhesives, pharmaceuticals, and fine chemicals due to their excellent solubility. However, these materials not only have flash points as low as -10°C, but also generally possess dangerous characteristics such as high flammability, high evaporation rates, and the ability of their vapors to form explosive mixtures with air. Therefore, their packaging and filling processes place extremely high demands on sealing, efficiency, precision, safety, and environmental protection; these are also key technical challenges of concern within the industry.

[0003] Currently, the typical workflow of existing automated filling equipment for this type of volatile liquid is as follows: First, the empty barrel is conveyed to the filling station and positioned by the conveying mechanism → the filling head descends and inserts into the barrel opening → the liquid is filled quantitatively using a "fast and slow dual-speed" strategy → after filling is completed, the filling head is lifted and withdrawn → the automatic capping mechanism places the barrel cap at the barrel opening → the capping mechanism performs sealing → finished product output.

[0004] However, in actual production lines, after the filling head is lifted and retracted, the automatic capping mechanism needs to complete a series of actions, including displacement, cap removal, alignment, and placement. The capping mechanism also requires time to complete the tightening operation. Even on highly automated production lines, there is a window period of tens of seconds to more than a minute between the lifting of the filling head and the complete tightening of the cap. For solvents like methyl acetate, which have a relatively fast evaporation rate, a large amount of liquid will change from liquid to gas during this window period, escaping from the open container opening into the working environment. This not only causes considerable material loss but also creates a localized high-VOC concentration area in a very short time, increasing the risk of fire and explosion and posing a threat to the health of operators.

[0005] To ensure filling accuracy, existing equipment commonly employs a "fast-slow dual-speed" filling strategy: first, a higher flow rate is used to complete 90%-95% of the target volume (coarse filling); then, a lower flow rate is switched for precise replenishment (fine filling). Since coarse and fine filling are performed sequentially at the same station, the fine filling stage, due to its slower flow rate, occupies a longer station time, becoming a bottleneck in the entire production line's cycle time. If the fine filling time is shortened or the flow rate is increased to improve efficiency, the metering accuracy decreases; if the fine filling time is extended to ensure accuracy, the output per unit time decreases. This inherent sequential execution mode creates an inherent contradiction between filling speed and filling accuracy, making it difficult to achieve both simultaneously.

[0006] In response to the inherent contradictions mentioned above, namely the excessively long volatilization window and the difficulty in balancing filling speed and filling accuracy, this invention designs an automated packaging machine for chemical production. Summary of the Invention

[0007] The purpose of this invention is to provide an automated packaging machine for chemical production, which can solve the problems of excessively long volatilization window time and difficulty in balancing filling speed and filling accuracy in the existing technology.

[0008] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution: This invention relates to an automated packaging machine for chemical production, comprising a filling component, a filling machine, a sealing machine, and a sealed working chamber that completely encloses the filling and sealing processes; the sealed working chamber provides physical isolation between volatile liquids and the external environment, preventing the fugitive emission of VOCs, and providing independent working space for each process. The sealed working chamber is equipped with a filling station for coarse filling, a replenishing station for fine filling, and a capping station. A filling machine is fixedly installed at the filling station, and a capping machine is fixedly installed at the capping station. In other words, the sealed working chamber separates the coarse filling, fine filling, and capping processes and completely encloses the entire process. To enable automatic transfer of containers between workstations and ensure that the filling components move synchronously with the containers, the sealed working chamber is equipped with a conveying mechanism for transporting the containers throughout the entire process. A filling component is detachably and sealingly connected to the container opening. The conveying mechanism causes the containers to pass sequentially through the coarse filling, fine filling, and capping workstations, with the filling components moving together with the containers. This ensures continuous sealing of the container opening throughout the filling process and minimizes the evaporation window, thus significantly reducing the evaporation window period. The filling assembly includes a filling connection part, a filling reservoir, and a lifting pipe. The top of the filling connection part is fixedly connected to the filling reservoir and is provided with an inflation inlet and an exhaust outlet. Before filling, the filling connection part is sealed to the container opening to form a reliable seal, and serves as a temporary sealing cap for the container opening after coarse filling, while also providing a buffer liquid and a pneumatic driving basis for subsequent fine filling. The filling reservoir buffers the liquid for fine filling. The inflation inlet is used to introduce nitrogen into the container, and the exhaust outlet is used to discharge gas from the container. It can also serve as a nitrogen source to provide nitrogen to the filling reservoir and discharge the air inside the filling reservoir. In this case, the connection pipe serves as the exhaust pipe for the filling reservoir. To achieve submerged filling during coarse filling and reduce splashing and evaporation, a lifting pipe is designed that moves up and down with the filling valve of the existing filling machine. The top of the lifting pipe is axially slidably and sealingly connected to the bottom of the filling connection, and a first return spring is sleeved between them. The first return spring is used to drive the lifting pipe to return to its original position relative to the filling connection, so that it remains in a retracted and closed sealed position without external force. During the filling process, the filling valve of the filling machine presses down the lifting diversion port at the bottom of the lifting pipe. The bottom of the lifting pipe and the lifting diversion port descend to the bottom of the container for submerged filling, and it also rises in real time with the filling valve under the action of the first return spring. Ultimately, this achieves automatic sealing of the liquid passage to prevent dripping and evaporation.

[0009] As a preferred technical solution of the present invention, in order to achieve a fast, reliable, and reusable sealed connection between the filling component and the container opening, and to adapt to automated operation; the container has a fixing ring fixed below the container opening; the filling connection part is a double-layer tube structure, and a limiting ring is provided on the outer wall of the double-layer tube structure; the inner tube of the double-layer tube structure passes through the filling connection part; the edge of the limiting ring has a circumferential array of buckles for engaging with the fixing ring and oriented at an inclined downward direction; a sealing gasket is fitted between the bottom surface of the limiting ring and the container opening.

[0010] As a preferred technical solution of the present invention, in order to enable the buckle to automatically remain closed in its natural state and to open when pressed, thereby achieving a one-way locking function of "pressing in to engage and pulling out to disengage", the edge of the limiting ring is hinged to the buckle and a torsion spring is installed inside it; the torsion spring is used to drive the buckle to rotate inward around the hinge axis so that the buckle remains closed in the absence of external force; when installing, the filling component is placed on the container opening and pressed until the buckle locks the container's fixing ring; when disassembling, the filling component is directly pulled out of the container's fixing ring; the torsion spring provides a continuous radial inward locking force, and the buckle and fixing ring cooperate to achieve one-click installation and disassembly.

[0011] As a preferred technical solution of the present invention, in order to reduce the impact and splashing during liquid raw material injection, reduce static electricity generation, and achieve stable submersible filling; a corrugated pipe is fixedly connected between the top of the lifting pipe and the bottom of the inner tube of the filling connection part; a lifting diversion port is slidably fitted on the inner wall of the bottom of the lifting pipe; the lifting diversion port is a stepped frustum structure, and a second return spring is fitted between the two; several diversion channels are opened inside the lifting diversion port; the diversion channels extend from the top surface of the stepped frustum structure to the bottom peripheral side; a sealing sleeve is fitted on the bottom peripheral side of the lifting diversion port; a sealing ring is fixed on the top surface of the lifting diversion port; the corrugated pipe ensures the sealing performance when the lifting pipe slides; the lifting diversion port extends under the downward pressure of the filling valve, and disperses the concentrated liquid flow into multiple fine streams through the diversion channels to reduce impact; the second return spring causes the diversion port to automatically retract when filling stops; the sealing sleeve prevents liquid from leaking from the sliding gap; the sealing ring is used to prevent leakage and overflow during coarse filling.

[0012] As a preferred embodiment of the present invention, the mixed gas containing nitrogen and material vapor discharged from the container during the coarse filling process is recycled and reused; the exhaust outlet is fixedly connected to the filling and storage section, and a first one-way valve is fixedly installed on the connecting pipeline; the first one-way valve allows the flow direction to be from the exhaust outlet to the interior of the filling and storage section, so that the gas discharged from the container enters the gas phase space of the filling and storage section through the exhaust outlet, and forms compressed gas energy storage in the space to release pressure to assist in material replenishment during the subsequent fine filling stage; the first one-way valve prevents the mixed gas from flowing back into the container, and the gas phase space of the filling and storage section stores compressed gas, which releases pressure during fine filling to push the liquid raw material out to replenish the material.

[0013] As a preferred technical solution of the present invention, in order to accurately control the amount of material replenishment during the fine filling stage and realize automatic start and stop; the bottom of the filling and storage part is also fixedly connected to the filling connection part, and a first solenoid valve and a mass flow meter are fixedly installed on the connecting pipeline; the first solenoid valve controls the on and off of fine filling material replenishment, and the mass flow meter measures the mass of the liquid flowing through in real time, so as to realize closed-loop precise material replenishment.

[0014] As a preferred technical solution of the present invention, in order to ensure a pure and oxygen-free nitrogen environment inside the filling and storage section, a connecting pipe is fixedly connected to the filling and storage section, and a second solenoid valve is fixedly installed on the connecting pipe; a preset amount of liquid raw material is filled into the filling and storage section by a metering pump through the connecting pipe; when nitrogen is introduced into the container by a nitrogen source, nitrogen is also introduced into the filling and storage section through the exhaust outlet to expel air, etc.

[0015] As a preferred technical solution of the present invention, although the internal pressure of the container changes dynamically during the filling process, it can be roughly divided into three stages: a slight positive pressure before filling, an increase in pressure during coarse filling, and a decrease or stabilization of pressure after coarse filling; thus ensuring that the internal pressure of the container is lower than the internal pressure of the filling and storage section to guarantee the pressure difference required for replenishment; however, this pressure is affected by various factors and cannot be completely guaranteed to be stable; therefore, the filling connection part is designed with an electromagnetic pressure relief valve; the outlet of the electromagnetic pressure relief valve is connected to a gas storage cylinder by an NPT tapered pipe thread; the electromagnetic pressure relief valve is used to release pressure from the inside of the container to the gas storage cylinder; the gas storage cylinder is pre-vacuumed; that is, the internal pressure of the container is actively released before or during fine filling to form a pressure difference between the filling and storage section and the container, thereby assisting the liquid raw materials inside the filling and storage section to flow smoothly into the container; at the same time, the depressurized gas is collected to avoid direct emission of material vapor; and it is convenient for subsequent recycling and processing.

[0016] As a preferred technical solution of the present invention, in order to accurately calculate the actual liquid mass added during coarse filling, a weighing platform is fixedly installed in the container placement area of ​​the conveying mechanism; the weighing platform is equipped with a high-precision weighing sensor, which is used to measure the first total weight of the container and the filling assembly before coarse filling and the second total weight after coarse filling respectively; the initial total weight of the filling assembly has been pre-measured before installation, and the difference between the first total weight and the initial total weight and the empty weight of the container is used to verify the sealing status of the filling assembly, and the difference between the second total weight and the first total weight is used to calculate the actual liquid mass added during coarse filling, and the opening and closing of the first solenoid valve of the filling and storage section and the feeding speed are controlled by PLC closed-loop feedback to realize dynamic precision control of the fine filling process.

[0017] As a preferred technical solution of the present invention, to ensure operational safety in flammable and explosive environments and to be compatible with common chemical packaging containers; the negative pressure of the sealed working chamber is maintained by an explosion-proof centrifugal fan; at least one combustible gas concentration detector is installed on the sealed working chamber, and its alarm value is set to 10% of the lower explosive limit; the container is a 200L metal drum or an IBC ton container; the container is filled with nitrogen and maintained at a slight positive pressure; the explosion-proof centrifugal fan maintains the negative pressure inside the sealed working chamber to prevent combustible gas from leaking out; the combustible gas concentration detector monitors in real time and alarms when the limit is exceeded; the slight positive pressure state of the nitrogen-filled container can further isolate oxygen.

[0018] The present invention has the following beneficial effects: 1. This invention, through the design of the filling component, achieves continuous sealing of the container opening and decoupling and parallel operation of the coarse and fine filling processes throughout the entire filling process. This completely eliminates the VOCs emission window from filling to capping in traditional processes and overcomes the bottleneck of mutual constraints between efficiency and accuracy. Specifically, the filling component is sealed to the container before filling and passes through the coarse filling station, the fine filling replenishment station, and the capping station sequentially with the conveying mechanism. The filling component is only removed before capping, reducing the exposure time of the container opening to the second level, which greatly suppresses the fugitive emission of volatile organic compounds. At the same time, coarse filling and fine filling operate independently and in parallel at different stations. Coarse filling focuses on high-speed, large-capacity filling, while fine filling focuses on low-speed, high-precision replenishment, without waiting for each other, thus balancing the advantages of filling efficiency and metering accuracy.

[0019] 2. This invention achieves submerged filling and automatic sealing through the coordinated action of the lifting pipe and the lifting diversion port, and with the assistance of the first and second return springs, effectively reducing splashing, evaporation, and dripping. Specifically, during filling, the lifting pipe extends to the bottom of the container for submerged filling, eliminating static electricity and vapor dissipation caused by liquid impact. After filling, the first return spring drives the lifting pipe to retract automatically, while the second return spring drives the lifting diversion port to close, preventing residual liquid from dripping. This invention has the advantages of improving equipment cleanliness and safety. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the filling assembly and container provided by the present invention; Figure 2 A schematic diagram of the internal structure of the filling assembly and container provided by the present invention; Figure 3 A schematic diagram of the structural distribution of an automated packaging machine for chemical production provided by the present invention; Figure 4 This is a schematic diagram of the filling assembly provided by the present invention; Figure 5 A schematic diagram showing the internal positional changes of the filling assembly provided by the present invention before coarse filling; Figure 6 A schematic diagram illustrating the internal positional changes of the filling assembly provided by the present invention during coarse filling; Figure 7 This is a schematic diagram of the lifting and diverting port provided by the present invention.

[0021] Explanation of reference numerals in the attached figures: 1. Filling assembly; 2. Sealed working chamber; 3. Container; 4. Liquid raw material; 5. Nitrogen; 101. Filling connection; 102. Filling storage section; 103. Lifting pipe; 104. First return spring; 105. Mass flow meter; 201. Filling station; 202. Material replenishment station; 203. Capping station; 204. Conveying mechanism; 301. Fixing ring; 1011. Air inlet; 1012. Exhaust outlet; 1013. Limiting ring; 1014. Buckle; 1015. Sealing gasket; 1016. Electromagnetic pressure relief valve; 1021. Connecting pipe; 1022. Safety valve; 1031. Bellows; 1032. Lifting diversion port; 1033. Second return spring; 1034. Diversion channel; 1035. Sealing sleeve; 1036. Sealing ring. Detailed Implementation

[0022] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0023] Example 1 like Figures 1 to 3 As shown in the figure, an automated packaging machine for chemical production provided by an embodiment of the present invention includes a filling component 1, a filling machine, a sealing machine, and a sealed working chamber 2 that completely encloses the filling and capping processes. The sealed working chamber 2 provides physical isolation between volatile liquids and the external environment, avoiding fugitive emissions of VOCs, and provides independent working space for each process. The sealed working chamber 2 is provided with a filling station 201 for coarse filling, a replenishing station 202 for fine filling, and a capping station 203 arranged sequentially inside. A filling machine is fixedly installed on the filling station 201, and a sealing machine is fixedly installed on the capping station 203. That is, the sealed working chamber 2 realizes the separation of the coarse filling, fine filling, and capping processes and the complete enclosure of the entire process by the filling station 201, the replenishing station 202, and the capping station 203.

[0024] The core design of this embodiment is: fully sealed operation, exhaust compression and energy storage, air pressure driven material replenishment, and dual closed-loop metering; specifically: the filling component 1 provides a separable seal and operation function for the container opening; exhaust is discharged through the exhaust outlet 1012, and some of the gas is locked in the filling liquid storage section 102 to form compressed gas energy storage; the coarse filling and fine filling processes are decoupled and operated in parallel, and fine filling is driven by air pressure difference for material replenishment, with closed-loop accuracy control of the mass flow meter; weighing verification and compensation are performed to ensure accurate net content.

[0025] Among them, such as Figure 3As shown, to achieve automatic transfer of container 3 between workstations and ensure that filling component 1 moves synchronously with container 3, a conveying mechanism 204 for transporting container 3 is also installed inside the sealed working box 2. The conveying mechanism 204 transports container 3 throughout the entire process. The filling component 1 is detachably and sealed at the container opening of container 3. The conveying mechanism 204 causes container 3 to pass through the coarse filling, fine filling, and capping workstations in sequence. The filling component 1 moves together with container 3, achieving continuous sealing of container opening of container 3 throughout the filling process and minimizing the evaporation window period. It only occurs during the brief time between the capping process and the immediate capping when the filling component 1 is removed at the capping workstation 203. The expected time is no more than 10 seconds, and can even be controlled within 2-3 seconds. This time depends on the total speed of removing the filling component 1 and the capping machine. This greatly reduces the evaporation window period. Among them, such as Figure 2 As shown, the filling assembly 1 includes a filling connection part 101, a filling reservoir part 102, and a lifting pipe 103. The filling connection part 101 has a double-layer pipe structure, with the inner layer pipe penetrating through it. The top wall of the outer layer pipe is fixedly connected to the filling reservoir part 102, and the outer layer pipe has an inflation inlet 1011 and an exhaust outlet 1012. The exhaust outlet 1012 leads into the filling reservoir part 102. Before filling, the filling connection part 101 is sealed to the container opening of the container 3 to form a reliable seal, and serves as a temporary sealing cap for the container opening after coarse filling, while also providing a buffer liquid and a pneumatic driving basis for subsequent fine filling. The filling reservoir part 102 buffers the liquid for fine filling and is inflated by an inflation inlet 1011. The inlet 1011 is used to introduce nitrogen into the container 3, and the exhaust outlet 1012 is used to discharge the gas inside the container 3. At the same time, it can also serve as a nitrogen source to provide nitrogen to the filling and storage section 102 and discharge the air inside the filling and storage section 102. At this time, after the liquid raw material 4 is filled into the connecting pipe 1021, the connecting pipe 1021 can serve as an exhaust pipe to discharge excess nitrogen, thereby controlling the volume of the gas phase space inside the filling and storage section 102. Moreover, the mixed gas discharged from the container 3 is itself a gas that is close to vapor saturation because it has just been pushed out from above the liquid surface. When it enters the top of the filling and storage section 102, since the gas has reached the saturated vapor pressure, the liquid raw material 4 inside the filling and storage section 102 will not easily evaporate again. Among them, such as Figure 2As shown, in order to ensure that the nitrogen and vapor mixture inside container 3 can smoothly enter the filling and storage section 102 through the exhaust port 1012 at the container opening during coarse filling, thus forming energy storage, the gas space inside the filling and storage section 102 should not be too low. Otherwise, it will cause a sharp rise in gas pressure inside container 3 and the filling and storage section 102 during coarse filling, resulting in a potential danger. The gas flow path during coarse filling is as follows: liquid enters container 3 → gas inside container 3 is compressed → gas enters the gas phase space of the filling and storage section 102 through the exhaust port 1012 and the first one-way valve → compression and energy storage. Therefore, during coarse filling, the gas phase space inside container 3 and the gas phase space inside the filling and storage section 102 are compressed. The gas phase space needs to maintain a reasonable ratio to ensure smooth exhaust, stable pressure, and sufficient energy storage. According to the preliminary design, the reasonable ratio range of the gas phase space volume of the filling and storage section 102 to the gas phase space volume of the container 3 is about 0.1-0.25, and the optimal ratio should be about 0.2. The proportion of the gas phase space of the filling and storage section 102 to its total volume should not be less than 15%. In order to avoid overpressure, a safety valve 1022 for passive pressure relief is also required. The function of the safety valve 1022 is to release gas from the safety valve 1022 to reduce the pressure when the filling and storage section 102 is filled with too much gas during the coarse filling process, thereby achieving the function of a safety measure. Among them, such as Figure 5 As shown, to achieve submerged filling during coarse filling to reduce splashing and evaporation, a lifting pipe 103 is designed to move up and down with the filling valve of the existing filling machine. The top of the lifting pipe 103 is axially slidably and sealingly connected to the bottom of the filling connection 101, and a first return spring 104 is sleeved between them. The first return spring 104 is used to drive the lifting pipe 103 to return upward relative to the filling connection 101, so that it remains in a retracted and closed sealed position without external force. During the filling process, the filling machine... The filling valve presses down on the lifting and diverting port 1032 at the bottom of the lifting pipe 103; the bottom of the lifting pipe 103 and the lifting and diverting port 1032 descend to the bottom of the container 3 for submersible filling, and under the action of the first return spring 104, they rise in real time following the filling valve; the elastic force of the first return spring 104 is less than that of the second return spring 1033; therefore, the first return spring 104 resets first and the second return spring 1033 resets later; ultimately, the liquid passage is automatically closed to prevent dripping and evaporation.

[0026] Among them, such as Figure 4As shown, to achieve a quick, reliable, and reusable sealed connection between the filling assembly 1 and the container opening, and to adapt to automated operation, a fixing ring 301 is fixed below the container opening of the container 3; a limiting ring 1013 is provided on the outer wall of the double-layer tube structure; a buckle 1014 with an inclined downward orientation for engaging with the fixing ring 301 is arranged circumferentially at the edge of the limiting ring 1013; a sealing gasket 1015 is fitted between the bottom surface of the limiting ring 1013 and the container opening; the limiting ring 1013 provides an installation reference, the buckle 1014 engages with the fixing ring on the container 3, and the sealing gasket 1015 is compressed to form an airtight seal.

[0027] Among them, such as Figure 4 As shown, to ensure that the buckle 1014 automatically remains closed in its natural state and opens when pressed, achieving a one-way locking function of "pressing in and locking, pulling out and releasing," the edge of the limiting ring 1013 is hinged to the buckle 1014, and a torsion spring is installed inside. The buckle 1014 also has a limiting block, limiting its hinge range. When it locks the fixing ring 301, its angle is in the middle of the hinge range. The torsion spring drives the buckle 1014 to rotate inward around the hinge axis, ensuring that the buckle 1014 remains closed without external force. During installation, the filling component 1 is placed over the container opening of the container 3 and pressed until the buckle 1014 locks the fixing ring 301 of the container 3. During disassembly, the filling component 1 is directly pulled out of the fixing ring 301 of the container 3. The torsion spring provides a continuous radial inward locking force, and the buckle 1014 and fixing ring 301 work together to achieve one-click installation and disassembly.

[0028] Among them, such as Figure 4As shown, to reduce the impact and splashing during the injection of liquid raw material 4, reduce static electricity generation, and achieve stable submersible filling, a corrugated pipe 1031 is fixedly connected between the top of the lifting pipe 103 and the bottom of the inner tube of the filling connection part 101. A lifting diversion port 1032 is slidably fitted on the inner wall of the bottom of the lifting pipe 103. The lifting diversion port 1032 has a stepped frustum structure, and a second return spring 1033 is fitted between the two. Several diversion channels 1034 are opened inside the lifting diversion port 1032. The diversion channels 1034 extend from the top surface of the stepped frustum structure to the bottom peripheral side. A sealing sleeve 1035 is fitted on the bottom peripheral side of the lifting diversion port 1032. A sealing ring 1036 is fixed on the top surface of the diversion port 1032; the bellows 1031 ensures the sealing performance when the lifting pipe slides; the lifting diversion port 1032 extends under the downward pressure of the filling valve, and disperses the concentrated liquid flow into multiple fine streams through the diversion channel 1034 to reduce impact; the second return spring 1033 causes the diversion port to automatically retract when filling stops; the sealing sleeve 1035 prevents liquid from leaking from the sliding gap; the function of the sealing ring 1036 is to improve the sealing connection between the lifting diversion port 1032 and the bottom of the filling valve, thereby ensuring the smooth progress of coarse filling and preventing leakage and overflow; at the same time, it also reduces the error of subsequent weighing measurement, thereby ensuring filling accuracy.

[0029] Among them, such as Figures 5 to 6 As shown, to recover and reuse the mixed gas containing nitrogen and material vapor discharged from container 3 during the coarse filling process, it avoids increasing the burden on the negative pressure performance of the sealed working chamber 2, and utilizes the gas pressure to form energy storage in the filling and storage section 102 to assist in subsequent fine filling replenishment; the exhaust outlet 1012 is fixedly connected to the filling and storage section 102, and a first one-way valve is fixedly installed on the connecting pipeline; the first one-way valve allows the flow direction to be from the exhaust outlet 1012 to the interior of the filling and storage section 102, so as to allow for easy flow. The gas discharged from the container 3 enters the gas phase space of the filling and storage section 102 through the exhaust outlet 1012, and forms compressed gas energy storage in the space to release pressure to assist in feeding during the subsequent fine filling stage; the first one-way valve prevents the mixed gas from flowing back into the container 3, and the gas phase space of the filling and storage section 102 stores compressed gas, which releases pressure during fine filling to push the liquid raw material 4 out to feed; at the same time, the first one-way valve can also maintain the gas pressure inside the filling and storage section 102 at the end of the coarse filling, storing pressure energy for subsequent fine filling.

[0030] Among them, such as Figure 2 As shown, in order to accurately control the amount of material replenishment during the fine filling stage and realize automatic start and stop, the bottom of the filling storage section 102 is also fixedly connected to the filling connection section 101, and a first solenoid valve and a mass flow meter 105 are fixedly installed on the connecting pipeline; the first solenoid valve controls the on and off of fine filling material replenishment, and the mass flow meter 105 measures the mass of the liquid flowing through in real time to realize closed-loop precise material replenishment.

[0031] Among them, such as Figure 2 As shown, to ensure a pure, oxygen-free nitrogen environment inside the filling and storage section 102, a connecting pipe 1021 is fixedly connected to the filling and storage section 102, and a second solenoid valve is fixedly installed on the connecting pipe 1021. A preset amount of liquid raw material 4 is injected into the filling and storage section 102 by a metering pump through the connecting pipe 1021. After the preset amount of liquid raw material 4 is injected, excess nitrogen is discharged through the connecting pipe 1021 and the second solenoid valve to control the volume of the gas phase space inside the filling and storage section 102 within a preset range. This also allows the liquid raw material 4 inside the filling and storage section 102 to automatically flow into the container 3 under the action of air pressure, thus completing the precise quantitative feeding function. When nitrogen is introduced into the container 3 by a nitrogen source, nitrogen is also introduced into the filling and storage section 102 through the exhaust outlet 1012 to discharge air.

[0032] Among them, such as Figure 3 As shown, to accurately calculate the actual liquid mass added during coarse filling and verify the sealing status of the filling assembly, and simultaneously control the fine filling replenishment through closed-loop control of weighing data, high-precision metering is achieved. A weighing platform is fixedly installed in the placement area of ​​container 3 on the conveying mechanism 204. The weighing platform has a built-in high-precision weighing sensor, which is used to measure the first total weight of container 3 and filling assembly 1 before coarse filling and the second total weight after coarse filling. The initial total weight of filling assembly 1 has been pre-measured before installation. The difference between the first total weight and the initial total weight and the empty weight of the container is used to verify the sealing status of filling assembly 1. The difference between the second total weight and the first total weight is used to calculate the actual liquid mass added during coarse filling. The opening and closing of the first solenoid valve and the replenishment speed of the filling storage section 102 are controlled by PLC closed-loop feedback to achieve dynamic precision control of the fine filling process. The weighing platform acquires weight data, and the PLC compares and calculates the data to control the first solenoid valve, forming a closed-loop control to ensure the final filling accuracy.

[0033] Among them, such as Figure 3 As shown, to ensure operational safety in flammable and explosive environments and to be compatible with common chemical packaging containers, the negative pressure of the sealed working chamber 2 is maintained by an explosion-proof centrifugal fan. At least one gas concentration detector for detecting volatile liquid raw materials 4 is installed on the sealed working chamber 2, with its alarm value set at 10% of the lower explosive limit. Container 3 uses a 200L metal drum, IBC tonne container, or anti-static HDPE drum. Container 3 is filled with nitrogen 5 and maintained at a slight positive pressure, with a pressure range of 50-300 Pa. The explosion-proof centrifugal fan maintains a slight negative pressure of -50 Pa to -100 Pa inside the sealed working chamber 2 to prevent gas leakage. The gas concentration detector monitors in real time and alarms when limits are exceeded. The nitrogen-filled slight positive pressure of container 3 further isolates oxygen. Simultaneously, all valves and related parts used in this embodiment must be explosion-proof.

[0034] Example 2 A more preferred technical solution based on Embodiment 1 is as follows: Figures 5 to 6 As shown, to ensure a stable pressure difference, the filling connection 101 is also equipped with an electromagnetic pressure relief valve 1016. The outlet of the electromagnetic pressure relief valve 1016 is connected to a gas storage cylinder via an NPT tapered pipe thread. The electromagnetic pressure relief valve 1016 is used to release pressure from the inside of the container 3 into the gas storage cylinder. The gas storage cylinder is pre-vacuumed, meaning that it actively releases pressure from the inside of the container 3 before or during fine filling, creating a pressure difference between the filling liquid storage section 102 and the container 3. This helps the liquid raw material 4 inside the filling liquid storage section 102 to flow smoothly into the container 3. At the same time, it collects the depressurized gas to prevent the material vapor from being directly discharged. The opening time and duration of the electromagnetic pressure relief valve 1016 can be set via PLC according to the required replenishment amount for fine filling. The gas cylinder collects the gas containing material vapor released during pressure relief, and then connects it using standard pipe threads from the chemical industry to ensure the sealing requirements of the pressure relief pipeline. It has the advantage of facilitating subsequent recycling and processing. A pressure sensor can also be further configured to monitor the pressure in real time, and the PLC can issue an opening command in a timely manner when it detects overpressure. The electromagnetic pressure relief valve 1016 can also act as an active pressure limiting valve for safety protection throughout the filling process. This design achieves a dual safety guarantee effect.

[0035] The core workflow of this embodiment is briefly described as follows: 1. Installation and pre-filling with nitrogen: The filling component 1 is snapped and sealed onto the container 3, and nitrogen is introduced into the container 3 through the filling inlet 1011, and then nitrogen is introduced into the filling storage section 102 through the exhaust outlet 1012; In order to ensure the effect of the replacement gas, a hose can be connected to the inner end of the filling inlet 1011 and introduced into the bottom of the container 3, so as to prevent the nitrogen introduced into the filling inlet 1011 from being directly discharged through the exhaust outlet 1012 and reducing the effect of the replacement gas; 2. Pre-filling and calibration of the component with liquid raw material 4: The filling and storage section 102 is filled with a preset amount of liquid raw material 4 by a metering pump through the connecting pipe 1021, and the weighing platform on the conveying mechanism 204 pre-weighs the initial total weight of the filling component 1 and container 3. 3. Coarse filling and exhaust energy storage: The assembly of filling component 1 and container 3 enters the filling station 201. The filling valve of the filling machine descends and drives the lifting pipe 103 and the lifting diversion port 1032 to the bottom of the container for submerged filling. Under the action of the first return spring 104, it rises with the liquid level. The mixed gas compressed in the container 3 enters the gas phase space of the filling storage section 102 through the exhaust outlet 1012 and the first one-way valve, forming compressed gas energy storage. Coarse filling is completed by the filling machine. At the same time, the safety valve 1022 performs passive pressure relief. If the safety valve 1022 malfunctions and causes the PLC to detect that the air pressure has risen further to overpressure, it will send an opening command to the electromagnetic pressure relief valve 1016 and simultaneously send a shutdown command to stop the filling operation and ensure system safety. At this time, the electromagnetic pressure relief valve 1016 acts as an active pressure limiting valve throughout the filling process. In order to ensure the exhaust efficiency of the exhaust outlet 1012 in a short time during coarse filling, at least three exhaust outlets 1012 are provided. 4. Weighing after coarse filling: The weighing platform on the conveying mechanism 204 measures the second total weight of the assembly again, the PLC calculates the actual amount added for coarse filling, and determines the mass that needs to be added for fine filling; 5. Optional active pressure relief: When the electromagnetic pressure relief valve 1016 is opened, the gas in container 3 is released to the pre-vacuumed gas storage bottle, forming a pressure difference between the filling and storage section 102 and the container. 6. Fine Filling and Replenishment: The conveying mechanism 204 transports the assembly to the replenishment station 202. The first solenoid valve opens, and the liquid raw material 4 in the filling storage section 102 flows into the container 3 through the mass flow meter 105 under the action of compressed gas pressure and pressure difference. The mass flow meter provides real-time feedback. After the replenishment amount is reached, the PLC closes the first solenoid valve, completing the high-precision fine filling. The fine filling process is completed by the filling component 1. This process does not affect the subsequent coarse filling process of the container 3, and also relatively reduces the metering accuracy requirements of the filling valve in the filling machine. Therefore, the speed of the fine filling process within a suitable time range does not affect its filling speed and also ensures its filling accuracy. This solves the inherent contradiction that it is difficult to balance the overall filling speed and filling accuracy. 7. Capping and component disassembly: The assembly is moved to the capping station 203, the filling component 1 is pulled out from the container opening, and the sealing machine immediately presses and screws the cap on to achieve a sealed seal with an extremely short window period. 8. Component recovery and exhaust gas treatment: Remove the filling component 1 and evacuate the inside of the filling liquid storage section 102 and the gas storage bottle to restore the original state; the extracted gas is then recycled and treated.

[0036] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. An automated packaging machine for chemical production, comprising a filling machine, a sealing machine, and a sealed working chamber (2) that completely encloses the filling and sealing processes; characterized in that, It also includes filling components (1); The sealed working box (2) is provided with a filling station (201) for coarse filling, a replenishing station (202) for fine filling, and a capping station (203) in sequence; a filling machine is fixedly installed on the filling station (201); a capping machine is fixedly installed on the capping station (203); The sealed working box (2) is also equipped with a conveying mechanism (204) for conveying the container (3), and the conveying mechanism (204) conveys the container (3) throughout the process; the container opening of the container (3) is detachably sealed with a filling component (1). The filling assembly (1) includes a filling connection part (101), a filling liquid storage part (102), and a lifting pipe (103); the top of the filling connection part (101) is fixedly connected to the filling liquid storage part (102), and is provided with an air inlet (1011) and an exhaust outlet (1012). The top of the lifting tube (103) is axially slidably sealed and connected to the bottom of the filling connection (101), and a first return spring (104) is sleeved between the two; the first return spring (104) is used to drive the lifting tube (103) to return upward relative to the filling connection (101), so that it remains in a retracted and closed sealed position without external force.

2. The automated packaging machine for chemical production as described in claim 1, characterized in that, The container (3) has a fixing ring (301) fixed below the container opening; the filling connection part (101) is a double-layer tube structure, and a limiting ring (1013) is provided on the outer wall of the double-layer tube structure; the inner tube of the double-layer tube structure passes through the filling connection part (101); the edge of the limiting ring (1013) has a circumferential array of buckles (1014) for cooperating with the fixing ring (301) and facing downwards; a sealing gasket (1015) is fitted between the bottom surface of the limiting ring (1013) and the container opening of the container (3).

3. The automated packaging machine for chemical production as described in claim 2, characterized in that, The edge of the limiting ring (1013) is hinged to the buckle (1014), and a torsion spring is installed inside it; the torsion spring is used to drive the buckle (1014) to rotate inward around the hinge axis so that the buckle (1014) remains closed in the absence of external force; when installing, the filling component (1) is placed on the container opening of the container (3) and pressed until the buckle (1014) locks the fixing ring (301) of the container (3); when disassembling, the filling component (1) is pulled out directly from the fixing ring (301) of the container (3).

4. The automated packaging machine for chemical production as described in claim 2, characterized in that, A corrugated pipe (1031) is fixedly connected between the top of the lifting pipe (103) and the bottom of the inner tube of the filling connection part (101). A lifting diversion port (1032) is slidably fitted on the inner wall of the bottom of the lifting pipe (103). The lifting diversion port (1032) is a stepped frustum structure, and a second return spring (1033) is fitted between the two. Several diversion channels (1034) are opened inside the lifting diversion port (1032). The diversion channels (1034) extend from the top surface of the stepped frustum structure to the bottom peripheral side. A sealing sleeve (1035) is fitted on the bottom peripheral side of the lifting diversion port (1032). A sealing ring (1036) is fixed on the top surface of the lifting diversion port (1032).

5. The automated packaging machine for chemical production as described in claim 1, characterized in that, The exhaust outlet (1012) is fixedly connected to the filling and storage section (102), and a first one-way valve is fixedly installed on the connecting pipeline. The first one-way valve allows the flow direction to flow from the exhaust outlet (1012) to the interior of the filling and storage section (102), so that the gas discharged from the container (3) enters the gas phase space of the filling and storage section (102) through the exhaust outlet (1012) and forms compressed gas energy storage in the space to release pressure and assist in feeding in the subsequent fine filling stage.

6. The automated packaging machine for chemical production as described in claim 5, characterized in that, The bottom of the filling and storage section (102) is also fixedly connected to the filling connection section (101), and a first solenoid valve and a mass flow meter (105) are fixedly installed on the connecting pipeline.

7. The automated packaging machine for chemical production as described in claim 5, characterized in that, The filling and storage section (102) is fixedly connected to a connecting pipe (1021), and a second solenoid valve is fixedly installed on the connecting pipe (1021); the filling and storage section (102) is filled with a preset amount of liquid raw material (4) by a metering pump through the connecting pipe (1021).

8. An automated packaging machine for chemical production as described in claim 5, characterized in that, The filling connection part (101) is also provided with an electromagnetic pressure relief valve (1016); the outlet of the electromagnetic pressure relief valve (1016) is threadedly connected to a gas storage bottle; the electromagnetic pressure relief valve (1016) is used to release pressure from the inside of the container (3) into the gas storage bottle; the inside of the gas storage bottle is pre-vacuumed.

9. An automated packaging machine for chemical production as described in claim 1, characterized in that, The conveying mechanism (204) has a weighing platform fixedly installed in the placement area of ​​the container (3); the weighing platform has a built-in high-precision weighing sensor, which is used to measure the first total weight of the container (3) and the filling component (1) before coarse filling and the second total weight after coarse filling respectively; the initial total weight of the filling component (1) has been pre-measured before installation, and the difference between the first total weight and the initial total weight and the empty weight of the container is used to verify the sealing status of the filling component (1), and the difference between the second total weight and the first total weight is used to calculate the actual liquid mass added during coarse filling, and the opening and closing of the first solenoid valve of the filling storage section (102) and the feeding speed are controlled by PLC closed-loop feedback to realize dynamic precision control of the fine filling process.

10. An automated packaging machine for chemical production as described in claim 1, characterized in that, The negative pressure of the sealed working chamber (2) is maintained by an explosion-proof centrifugal fan; at least one combustible gas concentration detector is installed on the sealed working chamber (2), and its alarm value is set to 10% of the lower explosion limit; the container (3) is a 200L metal drum or an IBC ton drum; the container (3) is filled with nitrogen (5) and kept under a slight positive pressure.

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