A vertical vacuum sealer and a vacuum sealing method thereof

Abstract

This invention discloses a vertical vacuum sealing machine and its vacuum sealing method, belonging to the technical field of vacuum sealing machines. The vertical vacuum sealing machine includes a machine body, on which a sealing groove, a conveying mechanism, a lifting mechanism, a vacuum chamber mechanism, a heat sealing mechanism, and a gas-liquid separation device are arranged. The machine body is vertically arranged, and the sealing groove extends laterally to allow the bag to be inserted in a vertical position. The conveying mechanism clamps and conveys the bag laterally. The vacuum chamber mechanism includes a first chamber and a second chamber that can be closed to form a sealed chamber. The lifting mechanism drives the second chamber to rise and fall. The gas-liquid separation device is connected to the gas path of the vacuum chamber mechanism and is used to separate the gas-liquid mixture generated during vacuuming. This invention, through its vertical machine body and horizontal conveying layout, breaks through the limitations of traditional machines on sealing length and can handle large-sized bags; the vertical position keeps the liquid inside the bag away from the bag opening, ensuring sealing quality; the gas-liquid separation device effectively prevents liquid backflow from damaging the vacuum pump, achieving efficient and reliable automatic vacuum sealing.

Description

Technical Field

[0001] This invention relates to the field of vacuum sealing machine technology, specifically a vertical vacuum sealing machine and its vacuum sealing method. Background Technology

[0002] Traditional horizontal vacuum sealing machines employ a flat-lay body and a hinged top cover structure, such as the vacuum sealing machine disclosed in Chinese utility model patents CN202520345965.8, CN202520242806.5, and CN202520108268.0. The sealing length of these machines is determined by the machine's width, resulting in a fixed maximum sealing length. They cannot seal or vacuum bags exceeding the machine's width (such as large dry goods, whole poultry, or long, thin materials), exhibiting poor adaptability.

[0003] Furthermore, the lack of an effective gas-liquid separation mechanism during sealing operations results in a significant technical shortcoming: sealing machines are highly susceptible to liquid backflow when handling items containing liquid components or prone to producing liquid. When liquid is drawn into the vacuum system, it not only causes severe damage to core components but also leads to a substantial increase in maintenance costs and a marked decrease in overall sealing efficiency. For example, in the food processing industry, liquid backflow failures are frequent when vacuum-packing pre-prepared dishes with high broth content, becoming a key bottleneck restricting the sealing continuity and reliability of sealing machines.

[0004] Therefore, further improvements are necessary. Summary of the Invention

[0005] The present invention aims to provide a vertical vacuum sealing machine and a vacuum sealing method thereof to overcome the shortcomings of the prior art.

[0006] A vertical vacuum sealing machine designed for this purpose includes a machine body, on which a sealing groove, a conveying mechanism, a lifting mechanism, a vacuum chamber mechanism, a heat sealing mechanism, and a gas-liquid separation device are provided. The vacuum chamber mechanism includes a first chamber and a second chamber capable of closing to form a sealed chamber; the conveying mechanism is used to clamp the bag and drive the bag to be conveyed laterally; the heat sealing mechanism is used to heat seal the bag opening; the lifting mechanism is used to drive the second chamber to rise and fall to close or separate from the first chamber; the gas-liquid separation device is connected to the gas path of the vacuum chamber mechanism and is used to separate the gas-liquid mixture generated during the vacuuming process.

[0007] The machine body is vertically arranged, and the sealing groove extends laterally on the side of the machine body for inserting the bag in a vertical or inclined posture; the conveying mechanism includes a conveying bracket, a roller bracket, a lifting and positioning frame, and a first driving component. The roller bracket is provided with a first conveying roller and a second conveying roller. The first driving component drives the first conveying roller and / or the second conveying roller to rotate to clamp and convey the bag; the lifting mechanism includes a second driving component, a transmission component driven by the second driving component, and a movable component that is connected to the transmission component; the second chamber is provided with an inclined part, and the inclined part drives the second chamber to move vertically during horizontal movement.

[0008] The inclined portion includes an inclined top disposed on the top of the movable component, and an inclined groove disposed on the bottom of the second cabin and slidably engaged with the inclined top; the inclination angle between the inclined top and the inclined groove is less than the friction angle, so that the second cabin forms a self-locking mechanism in the closed position; a vertical guide portion is provided between the second cabin and the fuselage, through which the second cabin moves up and down in the vertical direction; a horizontal guide groove is provided between the movable component and the lifting positioning frame, through which the movable component slides in the horizontal direction; the heat sealing mechanism includes a heating element and a hot-pressing roller, the heating element and the hot-pressing roller are arranged opposite to each other to form a heat sealing station, and the heating element is fixed on the lifting positioning frame.

[0009] The vertical vacuum sealing machine also includes a control system and a detection element; the detection element is located at the entrance of the sealing groove and is used to detect the insertion of the bag; the control system is electrically connected to the detection element, the conveying mechanism, the lifting mechanism, the vacuum chamber mechanism, and the heat sealing mechanism; an upper positioning detection element and a lower positioning detection element are fixedly installed on the machine body, and the second chamber is provided with an upper positioning mating part and a lower positioning mating part that respectively cooperate with the upper positioning detection element and the lower positioning detection element; the control system is electrically connected to the upper positioning detection element and the lower positioning detection element respectively, and is used to control the start and stop of the second driving element according to the positioning signal.

[0010] The vertical vacuum sealing machine also includes a vacuum pump, which has a vacuum port, and the second chamber has a chamber air extraction port, which is connected to the vacuum port through a pipeline; the vacuum pump is fixedly mounted on the conveying bracket or the output wheel cover plate of the conveying bracket; the vacuum pump has a vacuum exhaust port; and the detection element is a photoelectric switch.

[0011] The gas-liquid separation device includes a water storage tank and a liquid collection container; the water storage tank is connected to the vacuum pump, and the water storage tank is provided with a water tank outlet; the liquid collection container is detachably installed on the water storage tank; the water storage tank is provided with a water tank inlet, and the water tank inlet is connected to the vacuum exhaust port; both the water tank inlet and the water tank outlet are located on the top of the water storage tank.

[0012] The vertical vacuum sealing machine also includes a liquid level detection device for detecting the liquid level inside the liquid collection container. The liquid level detection device is either a liquid level contact sensor or a liquid level non-contact sensor.

[0013] The water storage tank is also provided with one or more functional expansion holes.

[0014] The fuselage is provided with an external vacuum connection port; the vacuum port is connected to the cabin air extraction port and the external vacuum connection port respectively through a three-way connector.

[0015] The vertical vacuum sealing machine also includes a detachable external vacuum assembly connected to the external vacuum connection port; the external vacuum assembly includes an external vacuum connector, an external vacuum connecting pipe, and an external connector. One end of the external drawer connector is detachably connected to the external drawer connection port via an external drawer connection part, and the other end is connected to the external connector via the external drawer connecting pipe. The other end of the external connector is provided with an external connection part for detachable connection to an external container. The external drawer connection port is a one-way valve.

[0016] The vacuum sealing method of the above-mentioned vertical vacuum sealing machine includes the following steps: S1. Insert the bag into one end of the sealing groove. After the detection element detects the bag, the control system starts the conveying mechanism to convey the bag along the extension direction of the sealing groove. At the same time, the heat sealing mechanism heat seals the bag opening. S2. After the tail of the bag leaves the detection element, the control system controls the conveying mechanism to continue operating for a preset time period and then pauses, so that the tail of the bag is located between the first compartment and the second compartment. S3. The control system starts the lifting mechanism to drive the second cabin to rise and close with the first cabin to form a sealed chamber. S4. The control system starts the vacuum pump to evacuate the sealed chamber and simultaneously evacuate the bag. S5. After the bag body is vacuumed, the control system restarts the conveying mechanism and heat sealing mechanism to complete the complete sealing of the tail of the bag body. S6. The control system controls the lifting mechanism to drive the second compartment to descend and separate from the first compartment. Then the conveying mechanism sends the sealed bag out from the other end of the sealing groove.

[0017] The preset time period is pre-set according to the length of the bag and stored in the memory of the control system; In step S3, when the second cabin rises to the limit position where it is completely closed with the first cabin, the upper position detection component is triggered, and the control system stops the lifting mechanism after receiving the position signal. In step S6, when the second cabin descends to the limit position of separation, the lowering detection component is triggered, and the control system stops the lifting mechanism after receiving the positioning signal. The control system only starts the vacuum pump after receiving the arrival signal from the upper arrival detection component; The gas-liquid mixture generated during the vacuuming process is discharged into the gas-liquid separation device by the vacuum pump. After gravity separation in the water storage tank, the liquid settles in the liquid collection container, and the gas is discharged from the gas outlet of the water tank. When the liquid in the liquid collection container accumulates to the set liquid level, the liquid level detection device sends a signal to the control system, and the control system prompts the user to empty the liquid collection container or stop the machine operation.

[0018] The present invention, through the improvement of the above-described structure, has the following advantages compared with the prior art: 1. The machine body is designed vertically, and the sealing groove extends horizontally, ensuring that the bag remains upright or tilted during the sealing process. Liquid inside the bag flows naturally to the bottom under gravity, preventing it from flowing to the bag opening area and thus avoiding liquid contamination and ensuring heat-sealing quality.

[0019] 2. The conveying mechanism clamps the bag and drives it to be conveyed laterally, breaking through the limitation of traditional horizontal machines on the length of the bag. It can handle large-sized, long and narrow bags and facilitates continuous automated sealing.

[0020] 3. The first and second chambers are closed to form a sealed chamber, which only evacuates the area near the bag opening. There is no need to place the entire bag in the vacuum chamber. The structure is compact, the vacuuming speed is fast, and the energy consumption is low.

[0021] 4. The lifting mechanism independently drives the second compartment to rise and fall, and closes or separates from the first compartment. The action is controllable, which is convenient to coordinate with the conveying rhythm and realize the connection of automated processes.

[0022] 5. The gas-liquid separation device is connected to the gas circuit of the vacuum chamber mechanism, which can separate the gas-liquid mixture extracted during the vacuuming process, prevent liquid from entering the vacuum pump, effectively extend the service life of the vacuum pump, and improve the reliability of the machine.

[0023] 6. All functional mechanisms are integrated into the machine body, with a reasonable layout and small space occupation. Users only need to insert the bag into the sealing groove to automatically complete the entire process of conveying, vacuuming, heat sealing, gas-liquid separation, etc., which is convenient to use. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention.

[0025] Figure 2 This is a three-dimensional structural schematic diagram from another perspective of an embodiment of the present invention.

[0026] Figure 3 This is an exploded structural diagram of an embodiment of the present invention.

[0027] Figure 4 This is a three-dimensional structural diagram of an embodiment of the present invention with the fuselage and control system omitted.

[0028] Figure 5 This is a three-dimensional structural diagram of an embodiment of the present invention with the fuselage and control system omitted from another perspective.

[0029] Figure 6 This is a three-dimensional structural diagram of an embodiment of the present invention, omitting the fuselage and control system.

[0030] Figure 7 This is an exploded structural diagram of an embodiment of the present invention with the fuselage and control system omitted.

[0031] Figure 8 This is a cross-sectional structural diagram showing the assembly of the conveying mechanism, heat sealing mechanism, vacuum chamber mechanism, and detection elements.

[0032] Figure 9 This is a cross-sectional view of the lifting mechanism according to an embodiment of the present invention when it descends to the terminal position.

[0033] Figure 10 This is a cross-sectional view of the lifting mechanism according to an embodiment of the present invention when it is raised to the terminal position.

[0034] Figure 11 This is a cross-sectional structural diagram of the bag body during heat sealing according to an embodiment of the present invention.

[0035] Figure 12 This is a three-dimensional structural diagram of the conveying mechanism, lifting mechanism, vacuum chamber mechanism, and heat sealing mechanism.

[0036] Figure 13 This is a three-dimensional structural diagram of the conveying mechanism, lifting mechanism, vacuum chamber mechanism, and heat sealing mechanism from another perspective.

[0037] Figure 14 This is an exploded structural diagram of the conveying mechanism, lifting mechanism, vacuum chamber mechanism, and heat sealing mechanism.

[0038] Figure 15 This is an exploded structural diagram of the conveying mechanism, lifting mechanism, vacuum chamber mechanism, and heat sealing mechanism from another perspective.

[0039] Figure 16 This is an exploded structural diagram of the conveying mechanism and the first compartment.

[0040] Figure 17 This is an exploded structural diagram of the conveying mechanism and the first compartment from another perspective.

[0041] Figure 18 This is an exploded structural diagram of the lifting mechanism and the second compartment.

[0042] Figure 19 This is an exploded structural diagram of the lifting mechanism and the second cabin from another perspective.

[0043] Figure 20 This is a schematic diagram of the exploded structure of a gas-liquid separation device.

[0044] Figure 21 This is an exploded structural diagram of the external vacuum assembly.

[0045] Figure 22 This is an exploded structural diagram of the external vacuum assembly from another perspective.

[0046] Figure 23 This is a schematic diagram of the assembly cross-section of the external vacuum assembly. Detailed Implementation

[0047] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0048] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0049] See Figures 1-23 This vertical vacuum sealing machine includes a machine body 100. The machine body 100 is vertically arranged, and its side is provided with a laterally extending sealing groove 101 for inserting a bag body 300 in a vertical or inclined position. The machine body 100 is also provided with a conveying mechanism, a lifting mechanism, a vacuum chamber mechanism, a heat sealing mechanism, and a gas-liquid separation device.

[0050] The vacuum chamber mechanism includes a first chamber 1 and a second chamber 2 capable of closing to form a sealed chamber 400. The first chamber 1 is relatively fixed, while the second chamber 2 is movable relative to the first chamber 1. A conveying mechanism is used to clamp the bag 300 and drive the bag 300 to be conveyed laterally. A heat-sealing mechanism is used to heat-seal the bag opening. A lifting mechanism is used to drive the second chamber 2 to rise or fall to close or separate from the first chamber 1. A gas-liquid separation device is connected to the gas path of the vacuum chamber mechanism and is used to separate the gas-liquid mixture generated during the vacuuming process.

[0051] Working principle: The user inserts the bag 300 vertically or at an angle into one side of the sealing groove 101. The conveying mechanism clamps the bag 300 and conveys it laterally. During the conveying process, the heat-sealing mechanism heat-seals the bag opening. After the bag 300 is conveyed to the predetermined position, the lifting mechanism drives the second chamber 2 to rise, closing with the first chamber 1 to form a sealed chamber 400. Subsequently, the vacuum chamber mechanism uses the vacuum pump 7 to evacuate the sealed chamber 400. Since the bag opening of the bag 300 is located in this chamber, the inside of the bag is also evacuated. During evacuation, the airflow drawn from the bag opening may carry liquid droplets or condensate. These gas-liquid mixtures enter the gas-liquid separator for separation; the liquid is collected, and the gas is discharged. Finally, the second chamber 2 descends and opens, and the conveying mechanism delivers the sealed bag 300 from the other side of the sealing groove 101.

[0052] The machine body 100 is vertically positioned, while the sealing groove 101 extends horizontally, ensuring that the bag 300 remains vertical or tilted during the sealing process. Liquid inside the bag flows naturally to the bottom under gravity, preventing it from flowing to the bag opening area and thus avoiding liquid contamination and ensuring heat-sealing quality. The conveying mechanism clamps the bag 300 and drives it laterally, overcoming the limitations of traditional horizontal machines on bag length. This allows for the handling of large, long bags and facilitates continuous automated sealing. The first chamber 1 and the second chamber 2 close to form a sealed chamber 400, evacuating only the area near the bag opening without placing the entire bag 300 inside the vacuum chamber. This results in a compact structure, fast vacuuming speed, and low energy consumption. The lifting mechanism independently drives the second chamber 2, providing controllable movement and facilitating seamless integration with the conveying rhythm for automated processes. The gas-liquid separation device separates the gas-liquid mixture extracted during vacuuming, preventing liquid from entering the vacuum pump 7, effectively extending its lifespan, and improving the machine's reliability when handling liquid-containing items. All functional mechanisms are integrated on the body 100, with a reasonable layout and small space occupation. Users only need to insert the bag body 300 into the sealing groove 101 to automatically complete the whole process, which is convenient to use.

[0053] Specifically, the conveying mechanism includes a conveying bracket 30, a roller bracket 31, a lifting and positioning frame 32, and a first driving component 4. The roller bracket 31 is equipped with a first conveying roller 5 and a second conveying roller 6. The first driving component 4 drives either the first conveying roller 5 or the second conveying roller 6 to rotate, or simultaneously drives both to rotate in opposite directions, to clamp and convey the bag 300. The first driving component 4 is preferably a motor (such as a stepper motor or a geared motor), whose power output end is connected to the rollers via a power output gear 33. The conveying bracket 30 is fixedly mounted on the machine body 100 at the position corresponding to the sealing groove 101. The roller bracket 31 and the lifting and positioning frame 32 are respectively fixedly mounted on the conveying bracket 30, and are arranged vertically. The output wheel cover plate 34 covers the power output gear 33 and is fixedly connected to the conveying bracket 30, serving to protect the gear and prevent dust. The first driving component 4 can be fixed either to the conveying bracket 30 or to the output wheel cover plate 34; this flexible fixing method facilitates optimization according to the internal space layout of the machine body 100.

[0054] The lifting mechanism includes a second driving component 8, a transmission component 9 driven by the second driving component 8, and a movable component 10 connected to the transmission component 9. The second driving component 8 is preferably a motor (such as a stepper motor or a geared motor), the transmission component 9 is preferably a lead screw, and the movable component 10 is a nut block that cooperates with the lead screw. The second cabin 2 is provided with an inclined part, and the movable component 10 drives the second cabin 2 to move vertically up and down through the inclined part when moving horizontally.

[0055] A support frame 40 is fixedly installed on one side of the bottom of the roller bracket 31, and is supported on the conveying bracket 30 by the support frame 40, located above the lifting and positioning frame 32. The support frame 40 plays a role in strengthening and positioning, providing more stable support for the roller bracket 31 that carries the conveying roller and the hot pressing roller, preventing deformation or displacement during operation, and ensuring the stability of conveying and hot pressing accuracy. A fixing frame 41 is also fixedly installed at the bottom of the conveying bracket 30, and is fixedly suspended on the machine body 100 by the fixing frame 41, further improving the stability of the whole machine. The surfaces of the first conveying roller 5 and the second conveying roller 6 are provided with friction material (such as rubber) to increase the clamping force on the bag body 300.

[0056] Through the modular design of the conveyor bracket 30, roller bracket 31, and lifting positioning frame 32, and the first driving component 4 driving the two conveyor rollers to rotate in opposite directions, a stable clamping conveyor jaw is formed, which can effectively pull the bag body 300 from one side of the sealing groove 101 into the machine, achieving stable and reliable lateral conveying. The setting of the support frame 40 and the fixed frame 41 enhances the rigidity and stability of the structure. The lifting mechanism adopts a combination of the second driving component 8, the transmission component 9, and the moving component 10, which, together with the inclined part, converts the horizontal movement into the vertical lifting of the second chamber 2. The transmission accuracy is high, and the lifting position of the second chamber 2 can be precisely controlled to ensure the sealing of the sealed chamber 400 when closed. The overall structure is compact and occupies little space, making it suitable for arrangement in the limited internal space of the sealing machine.

[0057] In this embodiment, the first conveying roller 5 and the second conveying roller 6 are each provided with a conveying roller shaft 35, and rotate on the roller support 31 via the shaft. A conveying roller drive gear 36 is provided on either the first conveying roller 5 or the second conveying roller 6 shaft 35, and this gear meshes with a power output gear 33. Simultaneously, each of the first and second conveying roller shafts 35 is also provided with a meshing conveying transmission gear 37. The hot-pressing roller 21 is provided with a hot-pressing roller shaft 38, and rotates on the roller support 31 via the shaft. A hot-pressing roller drive gear 39 is provided on the hot-pressing roller shaft 38, and this gear also meshes with the power output gear 33.

[0058] Through this gear transmission design, the power of the first driving component 4 is transmitted via the power output gear 33 to both the conveyor roller drive gear 36 and the heat-sealing roller drive gear 39. On one hand, the power, through the meshing conveyor drive gear 37, drives the first conveyor roller 5 and the second conveyor roller 6 to rotate synchronously in opposite directions at the same linear speed, thereby achieving stable clamping and conveying of the bag 300. On the other hand, the power synchronously drives the heat-sealing roller 21 to rotate. This design, where a single drive source simultaneously drives both conveying and heat sealing, is compact, reduces cost and energy consumption, and, more importantly, ensures that the linear speed of the heat-sealing roller 21 is completely synchronized with the linear speed of the conveyor roller, avoiding stretching or stacking of the bag 300 due to speed mismatch, and ensuring the flatness of the sealing area and the stability of the sealing quality.

[0059] The inclined section includes an inclined top 11 located on top of the movable member 10, and an inclined slide 12 located at the bottom of the second cabin 2 and slidingly engaged with the inclined top 11. When the movable member 10 moves forward horizontally, the inclined top 11 pushes the inclined slide 12, causing the second cabin 2 to rise; conversely, when the movable member 10 moves backward horizontally, the second cabin 2 descends under the action of gravity or a return spring. The inclination angle between the inclined top 11 and the inclined slide 12 is smaller than the friction angle (i.e., the friction angle between the mating surface materials), so that when the movable member 10 stops moving, even if the second cabin 2 is subjected to the air pressure thrust within the sealed chamber 400 or its own weight, it cannot push the movable member 10 in the opposite direction, thus forming a self-locking mechanism. A vertical guide section (e.g., a vertical guide column fixed on the lifting positioning frame 32 and a guide sleeve or guide groove on the second cabin 2) is provided between the second cabin 2 and the fuselage 100, so that the second cabin 2 can only rise and fall in the vertical direction. A horizontal guide groove is provided between the movable part 10 and the lifting and positioning frame 32, allowing the movable part 10 to slide only in the horizontal direction. The heat sealing mechanism includes a heating element 20 and a hot-pressing roller 21. The heating element 20 and the hot-pressing roller 21 are arranged opposite each other to form a heat sealing station, and the heating element 20 is fixed on the lifting and positioning frame 32. The heating element 20 has a hollow structure, and a heating element (such as an electric heating tube or a PTC heating element) is installed inside. The heating working surface of the heating element 20 faces the bag body 300, and it is usually covered with a high-temperature resistant, non-stick material such as polytetrafluoroethylene or silicone. The hot-pressing roller 21 is installed on the opposite side of the heating element 20, with a gap between them for the bag body 300 to pass through.

[0060] Working principle: The second driving component 8 drives the transmission component 9 (lead screw) to rotate, and the movable component 10 (nut block) slides horizontally, with its inclined top 11 forming an inclined surface engagement with the inclined groove 12 at the bottom of the second chamber 2. Since the second chamber 2 is restricted to vertical movement by the vertical guide and the movable component 10 is restricted to horizontal movement by the horizontal guide groove, when the movable component 10 moves horizontally, the inclined surface engagement converts the horizontal thrust into a vertical thrust, pushing the second chamber 2 upward. When the inclined angle is less than the friction angle, the inclined surface engagement has a self-locking characteristic, that is, after the drive stops, no matter how large the reverse force (such as the external atmospheric pressure during vacuum pumping) the second chamber 2 is subjected to, the movable component 10 cannot slide horizontally in the reverse direction, thus ensuring that the second chamber 2 remains stably in the closed position.

[0061] The inclined section has a simple structure and is easy to manufacture. Lubricant can be applied between the inclined top 11 and the inclined groove 12 to reduce friction. The self-locking feature allows the second chamber 2 to remain stably in the closed position without the need for an additional locking mechanism, simplifying the structure and improving reliability. The vertical guide section and horizontal guide groove eliminate swaying and jamming during movement, ensuring precise positioning and reliable sealing of the first chamber 1 and second chamber 2 each time they close. The roller-type heat sealing method provides uniform sealing and high speed, suitable for continuous operation. The heating element 20 is fixed on the lifting and positioning frame 32, opposite the upper heat-pressing roller 21, together forming a stable heat-sealing station. The heating element is placed inside the hollow cavity, which facilitates heat concentration and insulation, improving heat sealing efficiency.

[0062] The vertical vacuum sealing machine also includes a control system 200 and a detection element 3. The detection element 3 is located at the entrance of the sealing groove 101 and is used to detect the insertion of the bag 300. The detection element 3 is preferably a photoelectric switch (such as a through-beam or reflective photoelectric sensor), which has the advantages of fast response speed, long detection distance, and is unaffected by the color of the bag. The control system 200 is electrically connected to the detection element 3, the conveying mechanism, the lifting mechanism, the vacuum chamber mechanism, and the heat sealing mechanism. The control system 200 includes a control box and a PCB board housed within the control box. The PCB board integrates an MCU (microcontroller), a motor drive circuit, a power module, etc. The control box is fixed to the top of the machine body 100.

[0063] An upper positioning detection element 13 and a lower positioning detection element 14 are fixedly installed on the fuselage 100. The second compartment 2 is provided with an upper positioning mating part 2.2 and a lower positioning mating part 2.3, which respectively cooperate with the upper positioning detection element 13 and the lower positioning detection element 14. The upper positioning detection element 13 and the lower positioning detection element 14 are preferably microswitches or Hall effect sensors. Specifically, for example... Figure 14 , Figure 18 As shown, an upper positioning detection element 13 is fixedly installed on the output wheel cover plate 34, and a lower positioning detection element 14 is fixedly installed on the lifting positioning frame 32. The upper positioning mating parts 2.2 and lower positioning mating parts 2.3 on the second cabin 2 can be protruding blocks or sensing plates. The control system 200 is electrically connected to the upper positioning detection element 13 and the lower positioning detection element 14 respectively, and is used to control the start and stop of the second drive element 8 according to the positioning signal.

[0064] Working principle: When the bag body 300 is inserted into the sealing groove 101, the detection element 3 is triggered, sending a signal to the control system 200. The control system 200 then starts the conveying mechanism to begin conveying. When the second chamber 2 rises to its limit position where it is completely closed with the first chamber 1, the upper positioning mating part 2.2 triggers the upper positioning detection element 13. Upon receiving the signal, the control system 200 immediately stops the second drive element 8 to avoid overshoot. Similarly, when the second chamber 2 descends to its limit position where it is separated, the lower positioning mating part 2.3 triggers the lower positioning detection element 14, and the control system 200 stops the second drive element 8. The control system 200 only allows the vacuum pump 7 to start after receiving the positioning signal from the upper positioning detection element 13 to avoid air leakage due to incomplete mold closing.

[0065] Non-contact photoelectric detection is employed to avoid potential offset or skew issues when triggering microswitches due to the thin and flexible nature of the bag 300, ensuring the straightness of the bag 300 during transport and laying the foundation for subsequent precise heat sealing and vacuuming. By setting up upper and lower position detection elements 13 and 14, closed-loop control of the lifting mechanism's stroke is achieved, ensuring reliable formation of the sealed chamber 400 without excessive compression of the bag 300. Logical interlocking between the control system 200 and the position signal ensures the machine's safety and controllability.

[0066] The vertical vacuum sealing machine also includes a vacuum pump 7. The vacuum pump 7 is equipped with a vacuum port 7.2, and the second chamber 2 is equipped with a chamber exhaust port 2.1. The chamber exhaust port 2.1 and the vacuum port 7.2 are connected by a pipeline. The vacuum pump 7 is fixedly mounted on the conveyor support 30 or the output wheel cover plate 34 of the conveyor support 30, effectively utilizing the internal space of the machine body 100. The vacuum pump 7 is equipped with a vacuum exhaust port 7.1 for discharging the extracted gas-liquid mixture.

[0067] The vacuum pump 7's vacuum port 7.2 is connected to the second chamber 2's chamber air extraction port 2.1 via an air pipe. Once the sealed chamber 400 is formed, the vacuum pump 7 starts, extracting air from the sealed chamber 400 through this air path, thereby achieving a vacuum state inside the bag 300. The vacuum exhaust port 7.1 is then connected to a gas-liquid separation device.

[0068] The vacuum pump 7 is securely mounted on the conveyor bracket 30 or the output wheel cover plate 34, effectively utilizing the internal space of the machine body 100, resulting in a compact structure. A clearly defined air path provides reliable assurance for the vacuuming operation. A photoelectric switch, as the detection element, offers fast response and high accuracy, ensuring the system can promptly respond to the insertion of the bag body 300.

[0069] The gas-liquid separation device includes a water storage tank 15 and a liquid collection container 16. The water storage tank 15 is connected to a vacuum pump 7, and a water tank outlet 15.2 is provided on the water storage tank 15. The liquid collection container 16 is detachably mounted on the water storage tank 15, for example, using a drawer-type or snap-on structure. A handle is provided at the front end of the liquid collection container 16 to facilitate the user to pull it out from the side or front of the water storage tank 15. A water tank inlet 15.1 is provided on the water storage tank 15, and the water tank inlet 15.1 is connected to the vacuum exhaust port 7.1 of the vacuum pump 7. Both the water tank inlet 15.1 and the water tank outlet 15.2 are located on the top of the water storage tank 15.

[0070] Working principle: The vacuum exhaust port 7.1 of the vacuum pump 7 is connected to the water tank inlet 15.1 at the top of the water tank 15 via an air pipe. When the vacuum pump 7 starts, the gas-liquid mixture extracted from the sealed chamber 400 is sent into the water tank 15 through the vacuum exhaust port 7.1 and the water tank inlet 15.1. Since both the water tank inlet 15.1 and the water tank outlet 15.2 are located at the top of the water tank 15, after the gas-liquid mixture enters the water tank 15, the flow cross-section suddenly expands and the flow velocity decreases. Under the action of gravity, the denser liquid falls naturally and settles in the liquid collection container 16; while the less dense gas moves upward and is eventually discharged from the water tank outlet 15.2 located at the top of the water tank 15. A sealing strip (such as a silicone sealing ring) is provided between the liquid collection container 16 and the inner wall of the water tank 15 to ensure airtightness and prevent liquid leakage from the joint. The fuselage 100 is equipped with a fuselage exhaust port 103, which is connected to the water tank outlet 15.2. The clean gas after separation is discharged to the atmosphere through the fuselage exhaust port 103. A silencer or filter cotton can be further installed at the fuselage exhaust port 103 to reduce exhaust noise and filter out any trace amounts of oil mist that may remain.

[0071] The gas-liquid separation device effectively separates gas and liquid, ensuring that only gas is discharged while the liquid is intercepted and collected. On the one hand, it prevents liquid from being drawn into the vacuum pump 7, thus preventing internal parts from rusting, motor damage, or seal failure due to liquid intrusion, significantly improving the service life and reliability of the vacuum pump 7. On the other hand, the detachable design of the liquid collection container 16 allows users to easily clean up the accumulated liquid, reducing maintenance difficulty.

[0072] The vertical vacuum sealing machine also includes a liquid level detection element 17 for detecting the liquid level inside the liquid collection container 16. The liquid level detection element 17 is either a liquid level contact sensor or a liquid level non-contact sensor.

[0073] As a specific embodiment of a contact-type sensing device, the liquid level detection device 17 adopts a float-type liquid level switch. This float-type liquid level switch includes a float and a reed switch. The float has an embedded magnet and its density is less than that of the liquid. The guide rod is vertically installed inside the liquid collection container 16. When the liquid level rises, the float rises accordingly, and the magnet inside the float approaches the reed switch, causing its contacts to close and generating a liquid level arrival signal. As a specific embodiment of a non-contact-type sensing device, the liquid level detection device 17 adopts a photoelectric liquid level switch, including an infrared emitting device and an infrared receiving device. The probe is installed on the outer wall of the liquid collection container 16. When the liquid level has not reached the probe installation position, the infrared light is received after total reflection by the prism at the front end of the probe; when the liquid level rises to the probe installation position, the infrared light is refracted by the prism, and the receiving device cannot receive the reflected light, thus outputting a liquid level arrival signal. As another specific embodiment of the non-contact sensing device, the liquid level detection device 17 adopts an external capacitive liquid level switch, which is installed on the outer wall of the liquid collection container 16. It determines the liquid level by detecting the change in capacitance value caused by the change in liquid level on the inner side of the container wall. It does not require opening holes in the container and does not contaminate the medium. As yet another specific embodiment of the non-contact sensing device, the liquid level detection device 17 adopts an ultrasonic liquid level sensor, which is installed on the top or bottom of the liquid collection container 16. It uses the reflection characteristics of ultrasonic waves at the liquid surface to measure the liquid level.

[0074] Specifically, the water storage tank 15 is provided with a detection hole 15.3, and the liquid level detection element 17 is a liquid level contact sensor and is fixedly installed on the water storage tank 15. The detection end of the liquid level detection element 17 extends into the liquid collection container 16 through the detection hole 15.3.

[0075] Furthermore, the liquid level detection component 17 includes a liquid level detection PCB board and two metal probes (usually located at the low and high liquid level positions, respectively). A detection component fixing member 51 is provided on the outer wall of the water storage tank 15. The liquid level detection PCB board is fixed to the outer wall of the water storage tank 15 via the detection component fixing member 51, and the metal probes are inserted into the water storage tank 15 through the detection hole 15.3. The metal probes are insulated from the water storage tank 15.

[0076] Working principle: When the liquid in the collection container 16 accumulates to a set level (e.g., high level), the liquid simultaneously contacts two metal probes, causing a change in resistance between the probes or forming a current loop. The liquid level detection PCB detects this signal and sends an electrical signal to the control system 200. The control system 200 can then prompt the user to empty the collection container 16 via an audible and visual alarm, or automatically stop the vacuum pump 7 when the liquid level is too high, preventing liquid from overflowing the collection container 16 and flowing back into the water tank 15 or even the vacuum pump 7.

[0077] The liquid level detection element 17 can monitor the liquid level in the collection container 16 in real time, realizing intelligent liquid level management, greatly improving the safety and automation level of the machine, and avoiding malfunctions caused by user negligence. The detection hole 15.3 is located at the top of the water storage tank 15, which can prevent liquid from directly impacting the detection end of the liquid level detection element 17, and at the same time prevent liquid from leaking from the detection hole 15.3. The liquid level detection element 17 is fixed to the outer wall of the water storage tank 15 by a dedicated detection element fixing part 51, which is convenient to disassemble and install, easy to maintain or replace, and firmly fixed to prevent the detection position from shifting due to vibration.

[0078] The water storage tank 15 is also equipped with one or more functional expansion holes 15.5, which can be connected to external components such as solenoid valves, pressure gauges, safety valves, level gauges, temperature sensors, or cleaning interfaces. When connected to a solenoid valve, automatic water replenishment or drainage can be achieved; when connected to a pressure gauge, the pressure inside the tank can be displayed in real time; when connected to a safety valve, overpressure protection can be provided; when connected to a level gauge or temperature sensor, level or temperature monitoring and control can be achieved; and when connected to a cleaning interface, the inside of the water storage tank can be easily flushed. Each functional expansion hole can be sealed with a plug when not in use, and through flexible configuration, different packaging requirements can be met.

[0079] In this embodiment, the water tank inlet 15.1, water tank outlet 15.2, and detection hole 15.3 are all located on the top of the water tank 15, while the functional expansion hole 15.5 is located on the side of the water tank 15. This design offers the following advantages: First, after the gas-liquid mixture enters from the top, the liquid naturally falls to the bottom under gravity, while the gas exits from the top, forming a clear gas-liquid flow path and achieving optimal separation. Second, the detection hole 15.3, located at the top, prevents direct impact of liquid on the detection end of the level detection element 17 and avoids leakage from the detection hole 15.3. Third, the level detection element 17 is fixed to the outer wall of the water tank 15 by a dedicated detection element fixing element 51, facilitating easy disassembly and replacement, and ensuring a secure fixation that prevents displacement of the detection position due to vibration.

[0080] The fuselage 100 is provided with an external evacuation connection port 102. A three-way connector is connected to the vacuum pump 7's vacuum port 7.2, which is connected to both the chamber evacuation port 2.1 and the external evacuation connection port 102. The external evacuation connection port 102 is preferably a one-way valve to ensure that outside air does not enter the vacuum pump 7 through this external evacuation connection port 102 when the external evacuation function is not in use.

[0081] By incorporating a three-way connector and an external vacuum connection port 102, the vacuum pump 7 can not only evacuate its own vacuum chamber but also evacuate external containers (such as food storage boxes, vacuum canisters, etc.) via an external vacuum assembly, expanding the application scenarios of the sealing machine and improving its versatility and added value. The external vacuum connection port 102 is a one-way valve, ensuring the sealing and reliability of the gas path system.

[0082] The vertical vacuum sealing machine also includes a detachable external vacuum assembly connected to the external vacuum connection port 102. The external vacuum assembly includes an external vacuum connector 18, an external vacuum connecting pipe 50, and an external connector 19. One end of the external vacuum connector 18 is detachably connected to the external vacuum connection port 102 via an external vacuum connection part 18.1, and the other end is connected to the external connector 19 via the external vacuum connecting pipe 50. The other end of the external connector 19 is provided with an external connection part 19.1 for detachable connection to an external container. The external vacuum connection part 18.1 can be designed as a standard quick-connect fitting for quick docking or disengagement from the external vacuum connection port 102. The external vacuum connecting pipe 50 is a flexible hose, facilitating the user to move the external connector 19 to different locations on the external container. The external connection part 19.1 can be adapted to the common external container's vacuum valve interface (such as threaded or snap-fit ​​interfaces) to ensure reliable sealing.

[0083] The detachable design allows for quick and easy switching between internal and external vacuum modes. Users simply connect the external vacuum assembly to the external vacuum connector 102 to utilize the built-in vacuum pump 7 of the sealing machine to evacuate the external container, eliminating the need to purchase a separate vacuum machine. The entire assembly has a simple structure and is easy to operate, improving the user experience.

[0084] The vacuum sealing method described above includes the following steps: Step S1: Insert the bag body 300 into the sealing groove 101 from one side. After the detection element 3 detects the bag body 300, the control system 200 starts the conveying mechanism to convey the bag body 300 along the extension direction of the sealing groove 101. At the same time, the heat sealing mechanism heat seals the bag opening of the bag body 300.

[0085] Step S2: After the tail 302 of the bag body 300 leaves the detection element 3, the control system 200 controls the conveying mechanism to continue operating for a preset time period and then pauses, so that the tail 302 of the bag body is located between the first chamber 1 and the second chamber 2. The preset time period is pre-set according to the length of the bag body and stored in the memory of the control system 200. For example, a timer or counter is set on the MCU of the control system 200 for timing. Before leaving the factory, the corresponding time value (e.g., 0.3 seconds) is calculated based on the no-load rotation speed of the first drive component 4 and the distance the bag body 300 needs to be conveyed forward, and written into the EEPROM of the MCU.

[0086] Step S3: The control system 200 activates the lifting mechanism to drive the second compartment 2 to rise and close with the first compartment 1 to form a sealed chamber 400. When the second compartment 2 rises to the limit position where it is completely closed with the first compartment 1, the upper position detection element 13 is triggered, and the control system 200 stops the lifting mechanism after receiving the position signal.

[0087] Step S4: The control system 200 starts the vacuum pump 7 to evacuate the sealed chamber 400, and simultaneously evacuates the bag body 300. The control system 200 only starts the vacuum pump 7 after receiving the arrival signal from the upper positioning detection element 13.

[0088] Step S5: After the bag body 300 is vacuumed, the control system 200 restarts the conveying mechanism and the heat sealing mechanism to complete the complete sealing of the tail 302 of the bag body.

[0089] Step S6: The control system 200 controls the lifting mechanism to drive the second chamber 2 to descend and separate from the first chamber 1. Then, the conveying mechanism sends the sealed bag 300 out from the other end of the sealing groove 101. When the second chamber 2 descends to the limit position of separation, the lowering detection element 14 is triggered, and the control system 200 stops the lifting mechanism after receiving the lowering signal.

[0090] During the above process, the gas-liquid mixture generated during vacuuming is discharged into the gas-liquid separation device via vacuum pump 7. After gravity separation in the water storage tank 15, the liquid settles in the liquid collection container 16, and the gas is discharged from the water tank outlet 15.2. When the liquid in the liquid collection container 16 accumulates to the set level, the liquid level detection element 17 sends a signal to the control system 200, which then prompts the user to empty the liquid collection container 16 or stop the machine operation.

[0091] This method, through the coordinated action of detection element 3 and control system 200, achieves continuous and automated heat sealing and vacuum treatment of bags 300 of different lengths. Precise control of the bag 300's stopping position using preset time ensures that the bag tail 302 is precisely positioned within the sealed chamber 400, creating optimal conditions for vacuuming and final sealing. No manual adjustment of the conveying distance is required, improving the machine's versatility and automation. Position detection of the lifting mechanism ensures accuracy and safety. The integration of a gas-liquid separation device ensures reliability when handling liquid-containing items, effectively protecting the vacuum pump 7. The entire method is sequential, convenient to operate, and runs stably and reliably.

[0092] The above describes the preferred embodiments of the present invention, illustrating and describing the basic principles, main features, and advantages of the invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as defined by the appended claims and their equivalents.

Claims

1. A vertical vacuum sealer comprising a body (100), characterized in that, The fuselage (100) is provided with a sealing groove (101), a conveying mechanism, a lifting mechanism, a vacuum chamber mechanism, a heat sealing mechanism, and a gas-liquid separation device; The vacuum chamber mechanism includes a first chamber (1) and a second chamber (2) capable of closing to form a sealed chamber (400). The conveying mechanism is used to clamp the bag (300) and drive the bag (300) to be conveyed laterally; The heat-sealing mechanism is used to heat-seal the bag opening; The lifting mechanism is used to drive the second cabin (2) to rise or fall to close or separate from the first cabin (1); The gas-liquid separation device is connected to the gas path of the vacuum chamber mechanism and is used to separate the gas-liquid mixture generated during the vacuuming process.

2. The vertical vacuum sealer of claim 1, wherein, The body (100) is vertically arranged, and the sealing groove (101) is horizontally extended on the side of the body (100) for inserting the bag body (300) in a vertical or inclined position. The conveying mechanism includes a conveying bracket (30), a roller bracket (31), a lifting and positioning frame (32), and a first driving member (4). The roller bracket (31) is provided with a first conveying roller (5) and a second conveying roller (6). The first driving member (4) drives the first conveying roller (5) and / or the second conveying roller (6) to rotate to clamp and convey the bag body (300). The lifting mechanism includes a second driving member (8), a transmission member (9) driven by the second driving member (8), and a movable member (10) connected to the transmission member (9); the second cabin (2) is provided with an inclined part, and the second cabin (2) is driven to lift vertically through the inclined part when moving horizontally.

3. The vertical vacuum sealer of claim 2, wherein, The inclined portion includes an inclined top (11) disposed on the top of the movable part (10) and an inclined groove (12) disposed on the bottom of the second cabin (2) and slidingly engaged with the inclined top (11). The inclined angle between the inclined top (11) and the inclined slide (12) is less than the friction angle, so that the second cabin (2) forms a self-locking mechanism in the closed position; A vertical guide section is provided between the second cabin (2) and the fuselage (100), and the second cabin (2) moves up and down in the vertical direction through the vertical guide section; a horizontal guide groove is provided between the movable part (10) and the lifting positioning frame (32), and the movable part (10) slides in the horizontal direction through the horizontal guide groove; The heat sealing mechanism includes a heating component (20) and a hot pressing roller (21). The heating component (20) and the hot pressing roller (21) are arranged opposite to each other to form a heat sealing station. The heating component (20) is fixed on the lifting and positioning frame (32).

4. The vertical vacuum sealer of claim 2, wherein It also includes a control system (200) and a detection element (3); the detection element (3) is disposed at the entrance of the sealing groove (101) and is used to detect the insertion of the bag body (300); The control system (200) is electrically connected to the detection element (3), the conveying mechanism, the lifting mechanism, the vacuum chamber mechanism, and the heat sealing mechanism; The fuselage (100) is fixedly provided with an upper positioning detection component (13) and a lower positioning detection component (14). The second cabin (2) is provided with an upper positioning engagement part (2.2) and a lower positioning engagement part (2.3) that respectively cooperate with the upper positioning detection component (13) and the lower positioning detection component (14). The control system (200) is electrically connected to the upper positioning detection component (13) and the lower positioning detection component (14) respectively, and is used to control the start and stop of the second drive component (8) according to the positioning signal.

5. The vertical vacuum sealer of claim 4, wherein, It also includes a vacuum pump (7), which is provided with a vacuum port (7.2), and the second chamber (2) is provided with a chamber air extraction port (2.1). The chamber air extraction port (2.1) and the vacuum port (7.2) are connected by a pipeline. The vacuum pump (7) is fixedly installed on the conveying bracket (30) or the output wheel cover plate (34) of the conveying bracket (30). The vacuum pump (7) is provided with a vacuum exhaust port (7.1). The detection element (3) is a photoelectric switch.

6. The vertical vacuum sealer of claim 5, wherein, The gas-liquid separation device includes a water storage tank (15) and a liquid collection container (16); the water storage tank (15) is connected to the vacuum pump (7), and the water storage tank (15) is provided with a water tank outlet (15.2); the liquid collection container (16) is detachably installed on the water storage tank (15); The water storage tank (15) is provided with a water tank air inlet (15.1), which is connected to the vacuum exhaust port (7.1); the water tank air inlet (15.1) and the water tank air outlet (15.2) are both located on the top of the water storage tank (15).

7. The vertical vacuum sealer of claim 6, wherein, It also includes a liquid level detection element (17) for detecting the liquid level inside the liquid collection container (16), wherein the liquid level detection element (17) is a liquid level contact sensor or a liquid level non-contact sensor; The water storage tank (15) is also provided with one or more functional expansion holes (15.5); The fuselage (100) is provided with a fuselage exhaust port (103), which is connected to the water tank exhaust port (15.2).

8. The vertical vacuum sealer of claim 5, wherein, The fuselage (100) is provided with an external vacuum connection port (102); the vacuum port (7.2) is connected to the cabin air extraction port (2.1) and the external vacuum connection port (102) respectively through a three-way connector.

9. The vertical vacuum sealer of claim 8, wherein, It also includes a detachable external vacuum assembly connected to the external vacuum connection port (102); the external vacuum assembly includes an external vacuum connector (18), an external vacuum connecting pipe (50), and an external connector (19). One end of the external drawer connector (18) is detachably connected to the external drawer connection port (102) via the external drawer connection part (18.1), and the other end is connected to the external connector (19) via the external drawer connecting pipe (50). The other end of the external connector (19) is provided with an external connection part (19.1) for detachable connection with an external container. The external drawer connection (102) is a one-way valve.

10. A method of vacuum sealing, characterized by, The vertical vacuum sealing machine according to any one of claims 7-9, wherein the vacuum sealing method includes the following steps: S1. Insert the bag (300) into one end of the sealing groove (101). After the detection element (3) detects the bag (300), the control system (200) starts the conveying mechanism to convey the bag (300) along the extension direction of the sealing groove (101). At the same time, the heat sealing mechanism heat seals the bag opening of the bag (300). S2. When the tail (302) of the bag body (300) leaves the detection element (3), the control system (200) controls the conveying mechanism to continue operating for a preset time period and then pauses, so that the tail (302) of the bag body is located between the first chamber (1) and the second chamber (2). S3, The control system (200) starts the lifting mechanism to drive the second cabin (2) to rise and close with the first cabin (1) to form a sealed chamber (400). S4. The control system (200) starts the vacuum pump (7) to evacuate the sealed chamber (400) and simultaneously evacuate the bag body (300); S5. After the bag body (300) is vacuumed, the control system (200) restarts the conveying mechanism and the heat sealing mechanism to complete the complete sealing of the tail (302) of the bag body. S6. The control system (200) controls the lifting mechanism to drive the second compartment (2) to descend and separate from the first compartment (1), and then the conveying mechanism sends the sealed bag (300) out from the other end of the sealing groove (101).

11. The method of claim 10, wherein the vacuum seal is formed by a vacuum sealant. The preset time period is pre-set according to the length of the bag and stored in the memory of the control system (200); In step S3, when the second cabin (2) rises to the limit position where it is completely closed with the first cabin (1), the upper position detection component (13) is triggered, and the control system (200) stops the lifting mechanism after receiving the position signal; In step S6, when the second cabin (2) descends to the limit position of separation, the lowering detection component (14) is triggered, and the control system (200) stops the lifting mechanism after receiving the positioning signal; The control system (200) only starts the vacuum pump (7) after receiving the arrival signal from the upper arrival detection element (13). The gas-liquid mixture generated during the vacuuming process is discharged into the gas-liquid separation device by the vacuum pump (7). After gravity separation in the water storage tank (15), the liquid is deposited in the liquid collection container (16), and the gas is discharged from the water tank outlet (15.2). When the liquid in the liquid collection container (16) accumulates to the set liquid level, the liquid level detection device (17) sends a signal to the control system (200), and the control system (200) prompts the user to empty the liquid collection container (16) or stop the machine operation.

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