Vacuum fresh-keeping machine

Abstract

The invention discloses a vacuum fresh-keeping machine which comprises a base body, a control circuit and a turning cover installed on the upper portion of the base body, the upper surface of the base body is a supporting face, the lower surface of the turning cover is a buckling face, the supporting face is gradually raised from the two sides to the middle, and the buckling face is matched with the supporting face in shape. The supporting face and the buckling face are each provided with a pressing sealing strip, and the pressing sealing strips are located in front of the bag opening hot melting sealing assembly. The seat body is provided with an air exhaust nozzle capable of moving back and forth, the air exhaust nozzle is located at the highest position of the supporting surface, and the seat body is further provided with a driving device for driving the air exhaust nozzle to move; a liquid sensor is arranged on the front portion of the air exhaust nozzle and electrically connected with the vacuum pump, the driving device and the bag opening hot melting sealing assembly, air in a bag body containing much liquid can be exhausted more cleanly, and meanwhile the liquid is prevented from reaching the sealing position to affect heat sealing.

Description

Technical Field

[0001] The invention belongs to the technical field of vacuum packaging, and more specifically relates to a vacuum fresh-keeping machine. Background Art

[0002] The Chinese patent application number 2021111192541 discloses an intelligent vacuum sealing machine, including a base, a control circuit and a flip cover installed on the upper part of the base, a buckle foot is provided on the left and right sides of the flip cover respectively, a vacuum device is installed in the inner cavity of the base or the flip cover, a bag mouth hot melt sealing assembly is provided at the front of the base or the flip cover, the base is provided with a chamber, an independently provided bracket assembly capable of being moved out of the chamber is movably placed in the upper part of the chamber, and a transversely extending air extraction groove is provided at the upper part of the bracket assembly;

[0003] A driving assembly is provided at the bottom of the chamber, and the driving assembly abuts against or drives the bracket assembly. A locking cover mechanism is respectively installed on the left and right sides of the bracket assembly, which cooperates with the buckle foot lock on the corresponding side.

[0004] At least one positioning buckle is arranged in the chamber, and a positioning chamber is provided at the bottom of the bracket assembly corresponding to the position of the positioning buckle, and the positioning chamber is inserted into the corresponding positioning buckle.

[0005] At least one of the positioning buckles is equipped with at least one first capacitor dielectric element which automatically determines whether there is liquid in the vacuum groove by detecting the change of the capacitor dielectric constant. The control circuit is electrically connected to the vacuum device, the bag mouth hot melt sealing component and the first capacitor dielectric element respectively.

[0006] At the same time, at least one second capacitor dielectric element for dry and wet sensing, which is electrically connected to the control circuit, is arranged on the bottom surface of the front part of the seat body and / or the top surface of the front part of the flip cover. The second capacitor dielectric element extends a set width in the lateral direction. The control circuit is provided with an automatic switching unit for dry and wet pumping working modes and an RC oscillation capacitor constant detection circuit for providing a periodic voltage to the second capacitor dielectric element. The RC oscillation capacitor constant detection circuit is electrically connected to the second capacitor dielectric element. The automatic switching unit for dry and wet pumping working modes is electrically connected to the vacuum pump and the bag mouth hot melt sealing assembly, respectively.

[0007] The above patented technology automatically identifies the dryness and wetness of the food in the bag, automatically switches the working mode, and works fully automatically and intelligently. When vacuuming, the bag with liquid is placed on the water-blocking table. When the liquid reaches the second capacitor dielectric element, it can be identified that there is liquid in the bag and enters the wet extraction working mode.

[0008] In the above patent, when vacuuming, the opening of the bag body extends into the vacuum groove, and is pressed by the upper sealing gasket on the cover body and the integrated sealing gasket on the base body near the opening. However, if the pressing force here is too large, vacuuming will be difficult and the vacuuming efficiency will be low; if the pressing force is too small, air leakage may occur; for example, in the Chinese patent with application number 201210580158.1, an adjustable sealing plate is used to make the clamping force between the sealing rings adjustable and controllable to ensure the sealing performance.

[0009] When there is liquid in the bag, air is extracted during the vacuum process, and irregular wrinkles will form on the surface of the bag. When the vacuuming speed is fast, the air extraction speeds at different lateral positions in the bag are different, that is, at this time, the liquid is already close to the bag opening at some lateral positions, while there is still more air at other positions. If heat sealing is performed at this time, there is still more air in the bag. If vacuuming continues, more liquid will be extracted. When more liquid passes through the sealing position, the difficulty of heat sealing increases, which may cause the seal to be loose or even fail. Summary of the invention

[0010] In view of the deficiencies in the prior art, the present invention provides a method for extracting the air in a bag along a specified route, preventing air leakage during the extraction process and ensuring the extraction efficiency. For a bag containing liquid, the curved support surface and the curved compression sealing strip can make the liquid have climbing resistance during the vacuum extraction process, and reach the extraction nozzle more slowly, thereby reducing the air content, extending the shelf life, and preventing the liquid from reaching the hot-melt sealing component at the bag opening and affecting the heat seal.

[0011] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a vacuum fresh-keeping machine, comprising a seat body, a control circuit and a flip cover installed on the upper part of the seat body, a buckle foot is respectively arranged on the left and right sides of the flip cover, a bag opening hot melt sealing assembly is arranged on the front part of the seat body or the flip cover, a vacuum pump is arranged on the seat body, the upper surface of the seat body is a supporting surface, the lower surface of the flip cover is a buckling surface, the supporting surface is gradually raised from both sides to the middle, the shape of the buckling surface matches the supporting surface, the supporting surface and the buckling surface are both provided with a compression sealing strip, and the compression sealing strip is located in front of the bag opening hot melt sealing assembly;

[0012] The seat body is provided with an air suction nozzle which can move forward and backward, and the air suction nozzle is located at the highest position of the support surface. When the air suction nozzle is extended, it reaches the front of the compression sealing strip, and when the air suction nozzle is retracted, it reaches the rear of the bag opening hot melt sealing component. The seat body is also provided with a driving device for driving the air suction nozzle to move;

[0013] A liquid sensor is arranged at the front of the vacuum nozzle, and the liquid sensor is electrically connected to the vacuum pump, the driving device and the bag opening hot-melt sealing component.

[0014] Furthermore, the compression sealing strip is gradually bent backward from both sides to the middle, and the bag opening hot-melt sealing assembly is gradually bent backward from both sides to the middle.

[0015] Furthermore, a handle is provided on the rear side of the base body and / or the flip cover, and when the handle is lifted, the fresh-keeping machine as a whole flips 90 degrees.

[0016] Furthermore, a lower bag opening assembly is arranged above the seat body, and the lower bag opening assembly is located in the horizontal middle position of the seat body, and the lower bag opening assembly includes a lower fixed seat, a lower suction cup and a telescopic tube, and a guide cylinder is arranged on the lower fixed seat, and an airway is arranged on the lower fixed seat, and the airway is connected to a vacuum pump, and the telescopic tube is connected to the fixed seat and communicated with the airway, and the lower suction cup is fixed above the telescopic tube and communicated with the telescopic tube, and the telescopic tube is located in the guide cylinder, and a spring is arranged in the guide cylinder to extend the telescopic tube; an upper bag opening assembly is arranged on the flip cover, and the upper bag opening assembly includes an upper suction cup, and the upper suction cup is connected to the vacuum pump, and the upper suction cup is located opposite to the lower suction cup; the bottom end of the upper suction cup and the top end of the lower suction cup are higher than the top end of the vacuum nozzle; the upper bag opening assembly and the lower bag opening assembly are located behind the bag opening hot melt sealing assembly; and the vacuum nozzle reaches the rear of the upper suction cup and the lower suction cup when retracted.

[0017] Furthermore, a liquid storage bin is arranged on the seat body, the bottom of the liquid storage bin is arranged at an angle, a drain port is arranged at the lowest point of the liquid storage bin, a plug is arranged at the drain port, the vacuum pump is connected to the liquid storage bin, the liquid storage bin is connected to a main air pipe, the main air pipe is connected to a hose and the airway of the lower fixed seat through a three-position two-way valve, the hose is connected to an air suction nozzle, and the lower suction cup is connected to the airway of the lower fixed seat.

[0018] The driving device further comprises a rotating shaft, a driving motor and a crank arm, the air suction nozzle is connected to the crank arm, the rotating shaft connects the driving motor and the crank arm, the rotating shaft is arranged vertically, and the crank arm and the air suction nozzle are rotated in a horizontal plane by the driving motor.

[0019] Furthermore, the seat body is provided with a plurality of through holes behind the bag opening hot melt sealing assembly, the flip cover is provided with a plurality of positioning holes corresponding to the through holes, positioning pins are arranged in the through holes, and the seat body is provided with a lifting device connected to the positioning pins.

[0020] The lifting device further comprises an electromagnetic coil and an iron sheet, wherein the electromagnetic coil is fixed at an upper position of the seat body, and the iron sheet is connected to a positioning pin.

[0021] Furthermore, the cross-section of the air suction nozzle is elliptical, the liquid sensor is a water immersion sensor, and the hardness of the two sides of the compression sealing strip is greater than the hardness in the middle.

[0022] Further, the vacuuming method includes:

[0023] S1, laying the bag body: placing the open side of the bag body on the support surface so that the bottom of the bag body covers the through hole and the lower suction cup;

[0024] S2, initial fixation: buckle the flap, lock the flap and the base, so that the sealing strip presses and fixes the bag body, and the upper suction cup presses the top of the bag body;

[0025] S3, secondary fixation: start the lifting device to make the positioning pin pass through the through hole, penetrate the bag body into the positioning hole, and completely fix the bag body;

[0026] S4, adjust the posture: lift the handle to turn the fresh-keeping machine 90 degrees, and the bag body is suspended in the air by the fresh-keeping machine;

[0027] S5, bag opening: start the vacuum pump, connect the main air pipe with the airway through the three-position two-way valve, and the upper and lower suction cups generate negative pressure to absorb the upper and lower sides of the bag respectively. As the negative pressure increases, the telescopic tube will shrink along the guide tube, and the lower suction cup will take the lower side of the bag away from the upper side, so that the bag opening is opened;

[0028] S5, inserting the suction nozzle: the suction nozzle is rotated horizontally by a power device, and the suction nozzle is inserted into the bag body along the opening of the bag body until the front end of the suction nozzle passes through the compression sealing strip;

[0029] S6, start to evacuate: connect the main air pipe with the hose through the two-position three-way valve, and generate negative pressure at the evacuation nozzle to evacuate the air in the bag;

[0030] S7, Pumping completed: Select the time point to complete the pumping according to the pumping status.

[0031] State 1: The water immersion sensor in the air suction nozzle detects liquid and stops pumping immediately; State 2: The pressure sensor connected to the vacuum pump reaches the pressure threshold and stops pumping immediately;

[0032] S8, sealing: after the vacuuming is completed, the vacuum nozzle is moved away from the bag body and reset by the power device, and the bag opening hot melt sealing assembly works to seal;

[0033] S9, take out the bag: open the flap and take out the evacuated and sealed bag.

[0034] Compared with the prior art, the beneficial effects of the present invention are: the time point of completing the vacuuming can be controlled according to the dry and wet states of the items in the bag. When there is liquid in the bag, the air can be extracted first to move the liquid away from the vacuum nozzle, delaying the time for the liquid to move toward the vacuum nozzle, and being able to stop in time after the gas is completely extracted, so that the air in the bag containing liquid can be extracted more thoroughly, and at the same time, the liquid can be prevented from reaching the heat sealing position, thereby ensuring the quality of the heat sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The three-dimensional structure of the vacuum fresh-keeping machine of the present invention Figure 1 (When the flip cover is separated from the base);

[0036] Figure 2 The three-dimensional structure of the vacuum fresh-keeping machine of the present invention Figure 2 (the bottom surface of the seat body is not shown);

[0037] Figure 3 This is a front view of the vacuum fresh-keeping machine of the present invention;

[0038] Figure 4 It is a bottom view of the vacuum fresh-keeping machine of the present invention (the bottom surface of the base body is not shown);

[0039] Figure 5 for Figure 4 Section view at AA in the middle;

[0040] Figure 6 It is a side view of the vacuum fresh-keeping machine of the present invention;

[0041] Figure 7 It is a three-dimensional structural diagram of the seat body in the present invention;

[0042] Figure 8 It is a top view of the seat body in the present invention;

[0043] Fig. 9 It is a schematic diagram after the bag body is placed on the seat body;

[0044] Fig.10 It is a three-dimensional structural diagram of the flip cover in the present invention;

[0045] Fig.11 A bottom view of the flip cover of the present invention;

[0046] Fig.12 It is a three-dimensional structural diagram of the air extraction nozzle in the present invention;

[0047] Fig.13 This is a cross-sectional view of the bag when air is being evacuated;

[0048] Fig.14 is a cross-sectional view of the compression sealing strip in the present invention;

[0049] Fig.15 This is the main view of the bag when it is evacuated;

[0050] Fig.16 is a cross-sectional view of another embodiment of the bag body when air is evacuated;

[0051] Fig.17 Schematic diagram of the position of the compression sealing strip and the bag opening hot melt sealing assembly in another embodiment.

[0052] 1. The bag body is provided with a plurality of air-conductive parts, and the plurality of air-conductive parts are provided with a plurality of air-conductive parts. The plurality of air-conductive parts are provided with a plurality of air-conductive parts, and the plurality of air-conductive parts are provided with a plurality of air-conductive parts. DETAILED DESCRIPTION

[0053] Reference Figures 1 to 17 The embodiment of the vacuum fresh-keeping machine of the present invention is further described.

[0054] In the description of the present invention, it should be noted that directional words, such as the terms "center", "lateral (X)", "longitudinal (Y)", "vertical (Z)", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of narrating the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific scope of protection of the present invention.

[0055] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. Therefore, the definition of "first" and "second" features can explicitly or implicitly include one or more of the features. In the description of the present invention, "several" and "a number" mean two or more, unless otherwise clearly and specifically defined.

[0056] A vacuum fresh-keeping machine includes a base body 10, a control circuit and a flip cover 20 installed on the upper part of the base body 10. The flip cover 20 and the rear side of the base body 10 can be connected by rotation in the prior art. A buckle foot is provided on the left and right sides of the flip cover 20 respectively. A locking cover mechanism that cooperates with the buckle foot is provided on the base body 10. Its structure is the same as that of the prior art. The locking cover mechanism includes a locking block and a pushing block for pushing the locking block. The locking block is slidably installed on the base body 10 in a transverse direction. The first side of the pushing block is fixed to the bracket assembly. The second side of the pushing block is in transmission cooperation with the first side of the locking block. The second side of the locking block is in lock cooperation with the corresponding buckle foot. Of course, the buckle foot and The positions of the locking cover mechanisms can be interchanged. A bag opening hot melt sealing assembly 12 is provided at the front of the base body 10 or the flip cover 20. The structure and sealing principle of the bag opening hot melt sealing assembly 12 can be adopted from the existing technology. A vacuum pump 50 is provided on the base body 10. The upper surface of the base body 10 is a supporting surface 101, and the lower surface of the flip cover 20 is a buckling surface 201. The supporting surface 101 is gradually raised from both sides to the middle. The shape of the buckling surface 201 matches the supporting surface 101. A compression sealing strip 11 is provided on both the supporting surface 101 and the buckling surface 201. The compression sealing strip 11 is located in front of the bag opening hot melt sealing assembly.

[0057] The seat body 10 is provided with a suction nozzle 70 that can move forward and backward. The suction nozzle 70 is located at the highest position of the support surface 101. When the suction nozzle 70 is extended, it reaches the front of the compression sealing strip 11. When the suction nozzle 70 is retracted, it reaches the rear of the bag opening hot melt sealing component 12. The seat body 10 is also provided with a driving device for driving the suction nozzle 70 to move.

[0058] A liquid sensor is disposed at the front of the vacuum nozzle 70 , and the liquid sensor is electrically connected to the vacuum pump 50 , the driving device and the bag opening hot melt sealing assembly 12 .

[0059] In this embodiment, Figure 3 As shown, the support surface 101 of the base 10 is a convex arc surface, the buckling surface 201 of the flip cover 20 is a concave arc surface, and the highest point on the base 10 from front to back is the air extraction area, that is, the air extraction nozzle 70 is in the air extraction area.

[0060] like Figure 8 and 9 As shown, in order to limit the sealing position of the bag body 100, a limit stop block 80 is preferably provided on the base body 10 at the rear of the bag opening hot melt sealing assembly 12. Two or more limit stops 80 may be provided, which are arranged laterally symmetrically, and the limit stop block 80 in the middle avoids the air extraction area, and the highest point of the limit stop block 80 is higher than the top of the compression sealing strip 11 on the base body 10.

[0061] The preferred vacuum pump 50 is connected to a pressure sensor, which is the same as the existing structure and is used to detect the negative pressure in the entire pipeline. When a predetermined negative pressure value (threshold) is reached, it is determined that the gas in the bag body 100 is completely extracted.

[0062] When there is a small amount of liquid (capable of flowing) in the bag body 100, it can be vacuumed by laying it flat. Specifically, the opening of the bag body 100 is oriented toward and against the limit stopper 80, the surface of the bag body 100 is pressed against the compression sealing strip 11 of the base body 10, and the vacuum nozzle 70 is extended into the opening of the bag body 100, and the flip cover 20 is buckled, so that the flip cover 20 and the compression sealing strip 11 of the base body 10 cooperate to compress the bag body 100 and seal the area except for the vacuum nozzle 70; at this time, the part of the bag body 100 resting on the base body 10 is arc-shaped, that is, the two sides are lower and the middle is higher, and the vacuum is started, the air in the bag body 100 will gather to the middle of the horizontal direction and be discharged through the vacuum nozzle 70, and the heavier liquid will be difficult to be discharged due to gravity. The liquid flows toward the middle until all the air is exhausted. At this time, continue to suck, and the liquid will move toward the middle along the inclined supporting surface 101. When the liquid enters the vacuum nozzle 70, it is detected by the liquid sensor. The liquid sensor promptly transmits the signal to the vacuum pump 50 and the driving device. The driving device retracts the vacuum nozzle 70 and leaves the compression sealing strip 11 and the bag opening hot melt sealing component 12. After leaving, the compression sealing strip 11 originally located at the vacuum nozzle 70 will immediately close the opening of the bag body 100 to prevent gas from entering and prevent liquid from flowing out to the area where the bag opening hot melt sealing component 12 is located. At the same time, the bag opening hot melt sealing component 12 works to seal the opening of the bag body 100, completing the vacuuming and heat sealing actions.

[0063] When there is a lot of liquid in the bag 100, vacuuming can be done by hanging. At this time, the whole fresh-keeping machine can be rotated 90 degrees so that the front of the fresh-keeping machine faces downward. The bag 100 is clamped and fixed between the flip cover 20 and the base 10 due to the compression of the sealing strip 11. The whole bag 100 is suspended in the air. At this time, the vacuuming nozzle 70 starts to vacuumize. It is more difficult for the liquid in the bag 100 to rise, so as to prevent the liquid from being discharged before the air. When the liquid reaches the vacuuming nozzle 70, it is detected by the liquid sensor. The body sensor transmits the signal to the vacuum pump 50 and the driving device in time, and the driving device retracts the vacuum nozzle 70 and leaves the compression sealing strip 11 and the bag opening hot melt sealing component 12. After leaving, the compression sealing strip 11 originally located at the vacuum nozzle 70 will immediately close the opening of the bag body 100 to prevent gas from entering and prevent liquid from flowing out to the area where the bag opening hot melt sealing component 12 is located. At the same time, the bag opening hot melt sealing component 12 works to seal the opening of the bag body 100, completing the vacuuming and heat sealing actions.

[0064] like Figure 7As shown, in this embodiment, the compression sealing strip 11 is preferably bent gradually backward from both sides to the middle, and the bag opening hot-melt sealing assembly 12 is bent gradually backward from both sides to the middle.

[0065] When there is a lot of liquid in the bag 100, vacuum is drawn by hanging. Fig. 9 As shown, the bag body 100 is fixedly clamped between the flip cover 20 and the base body 10. At this time, the bag body 100 is suspended in the air, the air pumping area is still at the highest point, and its left and right sides are still far away from the air pumping area. When the air is pumped out, the gas in the bag body 100 is pumped out, and the liquid in the bag body 100 needs to move from the low places on both sides to the high place in the middle, as shown in FIG. Fig.15 As shown, the path distance for the liquid to reach the air extraction area is extended, so that the air in the bag body 100 can be extracted more quickly and cleanly.

[0066] When there is almost no liquid in the bag body 100, vacuuming can be performed in the same manner as in the prior art. At this time, the vacuum pump 50 will stop when the pressure sensor reaches a threshold value, and the pressure sensor is electrically connected to the vacuum pump 50, the drive device and the bag opening hot melt sealing assembly 12. That is, when the pressure sensor reaches a threshold value, the vacuum pump 50 stops, the drive device separates the vacuum nozzle 70 from the bag body 100, and the bag opening hot melt sealing assembly 12 works to heat-seal the opening of the bag body 100.

[0067] like Figure 4 and 8 As shown, a handle 30 is provided on the rear side of the base body 10 and / or the flip cover 20. When the handle 30 is lifted, the fresh-keeping machine as a whole turns over 90 degrees, and the handle 30 is convenient for vacuuming in a suspended manner.

[0068] like Figure 5 and 7 As shown, a lower bag opening assembly is arranged above the seat body 10, and the lower bag opening assembly is located in the lateral middle position of the seat body 10. The lower bag opening assembly includes a lower fixed seat 61, a lower suction cup 65 and a telescopic tube 63. A guide cylinder 62 is arranged on the lower fixed seat 61, and an airway 611 is arranged on the lower fixed seat 61. The airway 611 is connected to the vacuum pump 50. The telescopic tube 63 is connected to the fixed seat and communicated with the airway 611. The lower suction cup 65 is fixed above the telescopic tube 63 and communicated with the telescopic tube 63. The telescopic tube 63 is located in the guide cylinder 62, and a spring 64 for extending the telescopic tube 63 is arranged in the guide cylinder 62; as shown Figure 5 and 10As shown, an upper bag opening assembly is provided on the flip cover 20, and the upper bag opening assembly includes an upper suction cup 66, which is connected to the vacuum pump 50, and the upper suction cup 66 is located opposite to the lower suction cup 65; the bottom end of the upper suction cup 66 and the top end of the lower suction cup 65 are higher than the top end of the vacuum nozzle 70; the upper bag opening assembly and the lower bag opening assembly are located behind the bag opening hot melt sealing assembly 12; the vacuum nozzle 70 reaches the rear of the upper suction cup 66 and the lower suction cup 65 when retracted.

[0069] The upper suction cup 66 and the lower suction cup 65 are both located in front of the limit stopper 80 , that is, when the bag body 100 is placed on the support surface 101 , the bag body 100 can cover the lower suction cup 65 , and when the flip cover 20 is closed, the upper suction cup 66 can fit the bag body 100 .

[0070] In this embodiment, multiple upper suction cups 66 and lower suction cups 65 can be provided. When the bag body 100 is placed, one side of the opening of the bag body 100 abuts against the limit stopper 80, the flip cover 20 is closed, and the compression sealing strip 11 on the flip cover 20 and the base body 10 first temporarily seals the bag body 100, and the upper suction cup 66 and the lower suction cup 65 clamp and fit the opening of the bag body 100. At this time, the vacuum pump 50 is started, and the upper surface and the lower surface of the bag body 100 are sucked by the upper suction cup 66 and the lower suction cup 65 respectively. As the negative pressure increases, the telescopic tube 63 will retract along the guide cylinder 62, so that the lower suction cup 65 moves away from the upper suction cup 66. Figure 5 As shown, the lower suction cup 65 will move downward, while the upper suction cup 66 will not move; the opening of the bag body 100 will be opened, and at this time, the upper and lower ends of the vacuum nozzle 70 are both in the opened opening area, and then the driving device moves the vacuum nozzle 70, extending into the bag body 100 along the opened opening, and squeezes the compression sealing strip 11 in the vacuum area, and extends into the area to be vacuumed, as shown in FIG. Fig.13 As shown, vacuuming is then started, i.e., there is no need to manually put the bag body 100 on the vacuum nozzle 70 in advance, and the bag body 100 is prevented from being moved or squeezed during the process of being put on the vacuum nozzle 70, causing the liquid in the bag body 100 to overflow.

[0071] The telescopic pipe 63 can be two pipe sections connected together, or a corrugated pipe.

[0072] After the air is exhausted, the negative pressure of the upper suction cup 66 and the lower suction cup 65 is lost, and the bag body 100 is no longer adsorbed. At the same time, there is no negative pressure in the telescopic tube 63. Under the action of the spring 64, the telescopic tube 63 will extend along the guide tube 62, and the lower suction cup 65 will return to its original position.

[0073] In this embodiment, in order to realize the connection between the vacuum pump 50 in the seat body 10 and the upper suction cup 66 on the flip cover 20, a relatively soft pipe or bellows can be used to connect the seat body 10 and the flip cover 20. When the flip cover 20 is opened or closed, the pipe or bellows can be moved and adjusted adaptively. Figure 6 As shown, a first connecting tube 661 connected to the vacuum pump 50 is provided on the seat body 10, and the top end of the first connecting tube 661 is open. A second connecting tube 662 connected to the upper suction cup 66 is provided on the flip cover 20, and the bottom end of the second connecting tube 662 is open. The top end of the first connecting tube 661 and the bottom end of the second connecting tube 662 are provided with sealing rings. When the flip cover 20 and the seat body 10 are buckled together, the second connecting tube 662 is connected and closed to the first connecting tube 661, and the negative pressure can be smoothly transmitted to the upper suction cup 66. There is no need to arrange complicated pipelines between the seat body 10 and the flip cover 20, and air leakage caused by the folding of the pipelines back and forth is avoided.

[0074] like Fig.14 As shown, the hardness of the compression sealing strip 11 on both sides is preferably greater than the hardness in the middle of the embodiment, wherein the compression sealing strip 11 can be made of rubber as a whole, and its interior is hollow with a compressible space, and the compression sealing strip 11 is thinner near the air pumping area, that is, the cross-section of the hollow area here is larger than the cross-section of the hollow areas on both sides, so that the compression sealing strip 11 in the air pumping area is more easily deformed, and when the air pumping nozzle 70 is inserted through the opening of the bag body 100, it is easier to open the compression sealing strip 11 here, and the compression sealing strip 11 in the non-air pumping area can compress and seal the sealed bag, especially when vacuuming in a suspension manner, it can ensure that the bag body 100 is stably suspended.

[0075] like Fig.12 As shown, the cross-section of the vacuum nozzle 70 is preferably elliptical in this embodiment, and the liquid sensor is a water immersion sensor 90. The elliptical vacuum nozzle 70 can more easily pass through the compression sealing strip 11, while ensuring a larger cross-sectional area for rapid vacuuming, and the vacuum nozzle 70 is preferably made of a relatively hard material as a whole, such as stainless steel, to avoid being squeezed and deformed by the compression sealing strip 11; the water immersion sensor 90 can detect in time when liquid enters the vacuum nozzle 70. Of course, the liquid sensor can also be implemented by other second capacitor dielectric elements such as those described in the prior art 2021111192541.

[0076] like Figure 2 , 4As shown in Figure 5, the seat body 10 of this embodiment is preferably provided with a liquid storage tank, the bottom of the liquid storage tank is arranged obliquely, a drain port is provided at the lowest point of the liquid storage tank, a plug is provided at the drain port, the vacuum pump 50 is connected to the liquid storage tank, the liquid storage tank is connected to the main air pipe 52, the main air pipe 52 is connected to the hose 53 and the airway 611 of the lower fixed seat 61 through a three-position two-way valve, the hose 53 is connected to the vacuum nozzle 70, and the lower suction cup 65 is connected to the airway 611 of the lower fixed seat 61.

[0077] The liquid storage tank can store the liquid extracted by the vacuum nozzle 70 to prevent the liquid from directly entering the vacuum pump 50 and causing damage, and the liquid discharge port can conveniently discharge the liquid; the three-position two-way valve can connect the main air pipe 52 to the airway 611 or the hose 53. Before vacuuming, the main air pipe 52 is connected to the airway 611, and then the lower bag opening component and the upper bag opening component cooperate to open the opening of the bag body 100, so that the vacuum nozzle 70 can be inserted; then the three-position two-way valve connects the main air pipe 52 with the hose 53 to realize the vacuuming operation of the vacuum nozzle 70.

[0078] like Figure 7 and 8 As shown, the preferred driving device of this embodiment includes a rotating shaft 41, a driving motor 40 and a crank arm 42, the air suction nozzle 70 is connected to the crank arm 42, the rotating shaft 41 connects the driving motor 40 and the crank arm 42, the rotating shaft 41 is vertically arranged, and the crank arm 42 and the air suction nozzle 70 are rotated in a horizontal plane by the driving motor 40.

[0079] In the initial state, the air suction nozzle 70 is in Figure 8 In the middle B position, when pumping, the pumping nozzle 70 is rotated clockwise to Figure 8 In the middle C position, in this embodiment, a crank arm 42 is used to connect the air suction nozzle 70 to enable it to rotate horizontally, which can reduce the occupied space in the front and rear directions and avoid the winding of the air suction nozzle 70 or the pipeline, thereby ensuring smooth and efficient air extraction.

[0080] The driving motor 40 and the crank arm 42 may be connected via a reduction gear set.

[0081] In combination with the oval cross-section of the vacuum nozzle 70, when the vacuum nozzle 70 rotates and extends into the opening of the bag body 100, the cross-sectional area of ​​the side that first contacts the bag body 100 is small, and the opening of the bag body 100 does not need to be very large to extend into the vacuum nozzle.

[0082] like Figure 7-11 As shown, in this embodiment, the base body 10 is preferably provided with a plurality of through holes 1011 behind the bag opening hot melt sealing assembly 12, and the flip cover 20 is provided with a plurality of positioning holes 2011 corresponding to the positions of the through holes 1011, and positioning pins 131 are arranged in the through holes 1011, and a lifting device is arranged on the base body 10, and the lifting device is connected to the positioning pins 131.

[0083] The end of the positioning pin 131 facing the positioning hole 2011 is a pointed end. After the flip cover 20 and the base body 10 are buckled together to clamp the bag body 100, the positioning pin 131 is extended out of the through hole 1011 and penetrates the bag body 100 to the positioning hole 2011 through the lifting device. A hole can be opened in the area between the bag body 100 corresponding to the compression sealing strip 11 and the opening to facilitate subsequent hanging and storage. It can also ensure that the bag body 100 is suspended stably during the vacuum extraction process in the hanging manner to avoid tilting or falling.

[0084] like Figure 1-3 As shown, in this embodiment, the force used to press the bag body 100 at the sealing strip 11 is relatively large, while at other positions, the support surface 101 and the buckling surface 201 are still pressing the bag body 100, that is, at this time, it is ensured that the positioning pin 131 can smoothly penetrate the bag body 100.

[0085] like Fig. 9 As shown, taking the case where there are 6 through holes 1011 as an example, the through holes 1011 and the positioning pins 131 are symmetrically distributed on both sides of the exhaust area, with 3 through holes 1011 and positioning pins 131 distributed on each side, and the spacing between each through hole 1011 and the compression sealing strip 11 is the same.

[0086] like Figure 2 and 5 As shown, the lifting device preferably in this embodiment includes an electromagnetic coil 132 and an iron sheet 133 . The electromagnetic coil 132 is fixed at an upper position of the seat body 10 , and the iron sheet 133 is connected to the positioning pin 131 .

[0087] When the electromagnetic coil 132 is energized, it will attract the iron sheet 133 to move toward it, thereby driving the positioning pin 131 to penetrate the bag body 100 to the positioning hole 2011. After the electromagnetic coil 132 is powered off, the positioning pin 131 will naturally retract into the through hole 1011 due to gravity. Of course, a return spring 64 can also be set between the positioning pin 131 and the seat body 10 so that the positioning pin 131 can be smoothly retracted into the through hole 1011 after the electromagnetic coil 132 is powered off.

[0088] like Figure 2 and 4 As shown, in this embodiment, the three positioning pins 131 on the left side are grouped as one group, and the three positioning pins 131 on the right side are grouped as one group, which are respectively controlled by a group of electromagnetic coils 132 and iron sheets 133.

[0089] A vacuum fresh-keeping machine also includes the following vacuuming method:

[0090] S1, laying the bag body 100: placing the open side of the bag body 100 on the support surface 101, so that the bottom of the bag body 100 covers the through hole 1011 and the lower suction cup 65; at this time, the bag body 100 attached to the support surface 101 is in an arc shape, with the left and right sides being low and the middle being high;

[0091] S2, preliminary fixation: buckle the flip cover 20, lock the flip cover 20 and the base body 10, so that the compression seal strip 11 compresses and fixes the bag body 100, and at the same time the upper suction cup 66 compresses the upper surface of the bag body 100; the compression seal strip 11 completely compresses the bag body 100 in the lateral direction;

[0092] S3, secondary fixation: start the lifting device, so that the positioning pin 131 passes through the through hole 1011, penetrates the bag body 100 to the positioning hole 2011, and completely fixes the bag body 100; when the lifting device is started, the electromagnetic coil 132 is energized to quickly attract the iron sheet 133, so that the positioning pin 131 vertically penetrates the bag body 100;

[0093] S4, adjusting the posture: lift the handle 30 to turn the fresh-keeping machine 90 degrees, and the bag body 100 is suspended in the air by the fresh-keeping machine; the bag body 100 is fixed to the fresh-keeping machine by the positioning pins 131 and the compression sealing strip 11;

[0094] S5, bag opening: start the vacuum pump 50, connect the main air pipe 52 with the airway 611 through the three-position two-way valve, and the upper suction cup 66 and the lower suction cup 65 generate negative pressure to respectively absorb the upper and lower sides of the bag body 100. As the negative pressure increases, the telescopic tube 63 will shrink along the guide tube 62, and the lower suction cup 65 will move the lower side of the bag body 100 away from the upper side, so that the opening of the bag body 100 is opened;

[0095] S5, inserting the air suction nozzle 70: the air suction nozzle 70 is rotated horizontally by a power device, and the air suction nozzle 70 is inserted into the bag body 100 along the opening of the bag body 100 until the front end of the air suction nozzle 70 passes through the compression sealing strip 11;

[0096] S6, start to evacuate: connect the main air pipe 52 with the hose 53 through the two-position three-way valve, and the air suction nozzle 70 generates negative pressure to suck the air in the bag body 100;

[0097] S7, Pumping completed: Select the time point to complete the pumping according to the pumping status.

[0098] State 1: the water immersion sensor 90 in the air suction nozzle 70 detects liquid and stops pumping immediately; State 2: the pressure sensor connected to the vacuum pump 50 reaches the pressure threshold and stops pumping immediately;

[0099] S8, sealing: after the vacuuming is completed, the vacuum nozzle 70 is moved away from the bag body 100 and reset by the power device, and the bag opening hot melt sealing assembly 12 works to seal;

[0100] S9, taking out the bag body 100: opening the flip cover 20, and taking out the evacuated and sealed bag body 100.

[0101] like Fig.16 As shown, in a new embodiment, the compression sealing strips 11 on the base 10 and the flip cover 20 have two strips from front to back, and the two ends of the compression sealing strips 11 are connected together to form a closed shape. Fig.17 As shown, the bag opening hot melt sealing assembly 12 is located between the two compression sealing strips 11 and is enclosed therein. When the flip cover 20 and the base body 10 are closed, the compression sealing strips 11 on the flip cover 20 and the base body 10 are completely fitted together to form a sealed cavity 111. When vacuuming, the vacuum nozzle 70 only needs to move twice. The specific vacuuming method is as follows:

[0102] S1, laying the bag body 100: placing the open side of the bag body 100 on the support surface 101, so that the bottom of the bag body 100 covers the through hole 1011 and the lower suction cup 65; at this time, the bag body 100 attached to the support surface 101 is in an arc shape, with the left and right sides being low and the middle being high;

[0103] S2, preliminary fixation: buckle the flip cover 20, lock the flip cover 20 and the base body 10, so that the compression seal strip 11 compresses and fixes the bag body 100, and at the same time the upper suction cup 66 compresses the upper surface of the bag body 100; the compression seal strip 11 completely compresses the bag body 100 in the lateral direction;

[0104] S3, secondary fixation: start the lifting device, so that the positioning pin 131 passes through the through hole 1011, penetrates the bag body 100 to the positioning hole 2011, and completely fixes the bag body 100; when the lifting device is started, the electromagnetic coil 132 is energized to quickly attract the iron sheet 133, so that the positioning pin 131 vertically penetrates the bag body 100;

[0105] S4, adjusting the posture: lift the handle 30 to turn the fresh-keeping machine 90 degrees, and the bag body 100 is suspended in the air by the fresh-keeping machine; the bag body 100 is fixed to the fresh-keeping machine by the positioning pins 131 and the compression sealing strip 11;

[0106] S5, bag opening: start the vacuum pump 50, connect the main air pipe 52 with the airway 611 through the three-position two-way valve, and the upper suction cup 66 and the lower suction cup 65 generate negative pressure to respectively absorb the upper and lower sides of the bag body 100. As the negative pressure increases, the telescopic tube 63 will shrink along the guide tube 62, and the lower suction cup 65 will move the lower side of the bag body 100 away from the upper side, so that the opening of the bag body 100 is opened;

[0107] S5, inserting the air suction nozzle 70: the air suction nozzle 70 is rotated horizontally by a power device, and the air suction nozzle 70 is inserted into the bag body 100 along the opening of the bag body 100 until the front end of the air suction nozzle 70 passes through the compression sealing strip 11;

[0108] S6, start to evacuate: connect the main air pipe 52 with the hose 53 through the two-position three-way valve, and the air suction nozzle 70 generates negative pressure to suck the air in the bag body 100;

[0109] S7, Pumping completed: Select the time point to complete the pumping according to the pumping status.

[0110] In state one, the water immersion sensor 90 in the air suction nozzle 70 detects liquid, and the air suction nozzle 70 retreats a distance to the sealed cavity 111, and continues to pump air to state two; in state two, the pressure sensor connected to the vacuum pump 50 reaches the pressure threshold, and the air suction is stopped immediately;

[0111] When the vacuum nozzle 70 vacuums the sealing cavity 111, the sealing cavity 111 area can be vacuumed. When sealing, all the air from the sealing position to the bottom of the bag body 100 is completely extracted;

[0112] S8, sealing: after the vacuuming is completed, the vacuum nozzle 70 is completely removed from the bag body 100 and reset by the power device, and the bag opening hot melt sealing assembly 12 works to seal;

[0113] S9, taking out the bag body 100: opening the flip cover 20, and taking out the evacuated and sealed bag body 100.

[0114] The structure and method of the present invention can more thoroughly extract the air in the bag containing liquid and prevent the liquid from reaching the heat-sealing position, thereby ensuring the heat-sealing quality.

[0115] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A vacuum fresh-keeping machine, comprising a base, a control circuit and a flip cover mounted on the upper part of the base, wherein a buckle foot is provided on the left and right sides of the flip cover respectively, a bag opening hot-melt sealing assembly is provided on the front part of the base or the flip cover, and a vacuum pump is provided on the base, characterized in that: The upper surface of the seat body is a supporting surface, and the lower surface of the flip cover is a buckling surface. The supporting surface is gradually raised from both sides to the middle, and the shape of the buckling surface matches the supporting surface. The supporting surface and the buckling surface are both provided with compression sealing strips, and the compression sealing strip is located in front of the bag opening hot melt sealing component; the seat body is provided with an air suction nozzle that can move forward and backward, and the air suction nozzle is located at the highest position of the supporting surface. When the air suction nozzle is extended, it reaches the front of the compression sealing strip, and when the air suction nozzle is retracted, it reaches the rear of the bag opening hot melt sealing component. The seat body is also provided with a driving device that drives the air suction nozzle to move; A liquid sensor is arranged at the front of the vacuum nozzle, and the liquid sensor is electrically connected to the vacuum pump, the driving device and the bag opening hot-melt sealing component.

2. The vacuum fresh-keeping machine according to claim 1, characterized in that: The compression sealing strip is gradually bent backward from both sides to the middle, and the bag opening hot-melt sealing component is gradually bent backward from both sides to the middle.

3. The vacuum fresh-keeping machine according to claim 2, characterized in that: A handle is arranged on the rear side of the base body and / or the flip cover, and when the handle is lifted, the fresh-keeping machine as a whole flips 90 degrees.

4. The vacuum fresh-keeping machine according to claim 2, characterized in that: A lower bag opening assembly is arranged above the seat body, and the lower bag opening assembly is located in the horizontal middle position of the seat body, and the lower bag opening assembly comprises a lower fixed seat, a lower suction cup and a telescopic tube, the lower fixed seat is provided with a guide cylinder, the lower fixed seat is provided with an airway, the airway is connected to a vacuum pump, the telescopic tube is connected to the fixed seat and is communicated with the airway, the lower suction cup is fixed above the telescopic tube and is communicated with the telescopic tube, the telescopic tube is located in the guide cylinder, and a spring is arranged in the guide cylinder to extend the telescopic tube; an upper bag opening assembly is arranged on the flip cover, and the upper bag opening assembly comprises an upper suction cup, the upper suction cup is connected to the vacuum pump, and the upper suction cup is positioned opposite to the lower suction cup; the bottom end of the upper suction cup and the top end of the lower suction cup are higher than the top end of the vacuum nozzle; the upper bag opening assembly and the lower bag opening assembly are located behind the bag opening hot melt sealing assembly; the vacuum nozzle reaches behind the upper suction cup and the lower suction cup when it is retracted.

5. The vacuum fresh-keeping machine according to claim 4, characterized in that: A liquid storage bin is arranged on the seat body, the bottom of the liquid storage bin is arranged obliquely, a drain port is arranged at the lowest point of the liquid storage bin, a plug is arranged at the drain port, the vacuum pump is connected to the liquid storage bin, the liquid storage bin is connected to a main air pipe, the main air pipe is connected to a hose and the airway of the lower fixed seat through a three-position two-way valve, the hose is connected to an air suction nozzle, and the lower suction cup is connected to the airway of the lower fixed seat.

6. The vacuum fresh-keeping machine according to claim 5, characterized in that: The driving device comprises a rotating shaft, a driving motor and a crank arm, the air suction nozzle is connected to the crank arm, the rotating shaft connects the driving motor and the crank arm, the rotating shaft is arranged vertically, and the crank arm and the air suction nozzle are rotated in a horizontal plane by the driving motor.

7. The vacuum fresh-keeping machine according to claim 6, characterized in that: The seat body is provided with a plurality of through holes behind the bag opening hot melt sealing assembly, the flip cover is provided with a plurality of positioning holes corresponding to the through holes, positioning pins are arranged in the through holes, and the seat body is provided with a lifting device connected to the positioning pins.

8. The vacuum fresh-keeping machine according to claim 7, characterized in that: The lifting device comprises an electromagnetic coil and an iron sheet, wherein the electromagnetic coil is fixed at an upper position of the seat body, and the iron sheet is connected to a positioning pin.

9. The vacuum fresh-keeping machine according to claim 8, characterized in that: The cross section of the air suction nozzle is elliptical, the liquid sensor is a water immersion sensor, and the hardness of the two sides of the compression sealing strip is greater than the hardness in the middle.

10. The vacuum fresh-keeping machine according to claim 9, characterized in that: The following vacuuming methods are also included: S1, laying the bag body: placing the open side of the bag body on the support surface so that the bottom of the bag body covers the through hole and the lower suction cup; S2, initial fixation: buckle the flap, lock the flap and the base, so that the sealing strip presses and fixes the bag body, and the upper suction cup presses the top of the bag body; S3, secondary fixation: start the lifting device to make the positioning pin pass through the through hole, penetrate the bag body into the positioning hole, and completely fix the bag body; S4, adjust the posture: lift the handle to turn the fresh-keeping machine 90 degrees, and the bag body is suspended in the air by the fresh-keeping machine; S5, bag opening: start the vacuum pump, connect the main air pipe with the airway through the three-position two-way valve, and the upper and lower suction cups generate negative pressure to absorb the upper and lower sides of the bag respectively. As the negative pressure increases, the telescopic tube will shrink along the guide tube, and the lower suction cup will take the lower side of the bag away from the upper side, so that the bag opening is opened; S5, inserting the suction nozzle: the suction nozzle is rotated horizontally by a power device, and the suction nozzle is inserted into the bag body along the opening of the bag body until the front end of the suction nozzle passes through the compression sealing strip; S6, start to evacuate: connect the main air pipe with the hose through the two-position three-way valve, and generate negative pressure at the evacuation nozzle to evacuate the air in the bag; S7, Pumping completed: Select the time point to complete the pumping according to the pumping status. State 1: The water immersion sensor in the air suction nozzle detects liquid and stops pumping immediately; State 2: The pressure sensor connected to the vacuum pump reaches the pressure threshold and stops pumping immediately; S8, sealing: after the vacuuming is completed, the vacuum nozzle is moved away from the bag body and reset by the power device, and the bag opening hot melt sealing assembly works to seal; S9, take out the bag: open the flap and take out the evacuated and sealed bag.

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