A vacuum packaging automatic line vacuum pumping device and vacuum pumping method thereof

Abstract

The present invention relates to the field of product packaging, specifically a vacuum packaging automatic line vacuum pumping device, including a workbench, a base plate, a vacuum pump, a conduit and a conveyor belt, wherein the base plate is fixedly connected to the bottom of the workbench, the vacuum pump is installed on the upper surface of the base plate, one end of the conduit is installed on the input end of the vacuum pump, and the conveyor belt is installed on the upper surface of the workbench along the left and right directions, and further includes: a plurality of silicone strips, which are equidistantly installed on the outer wall of the conveyor belt along the front and back directions; and a vacuum packaging mechanism, which is installed in the middle of the outer side of the upper surface of the workbench. The present invention ensures that the heating strip is always straight, prevents the heating strip from bending and failing to completely clamp the packaging bag, improves the heat sealing quality of the packaging bag, can adjust the overall vacuum suction space according to the volume of the packaging bag containing the product, has a short vacuum suction time, and has high packaging efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of product packaging, in particular to a vacuum packaging automatic line vacuum pumping device and a vacuum pumping method thereof. Background Art

[0002] The vacuum packaging machine can automatically extract the air in the packaging bag and complete the sealing process after reaching a predetermined vacuum degree. It plays a role in protecting the product and preventing corrosion and oxidation of the product;

[0003] The components of the vacuum packaging machine for vacuum sealing the packaging bag are mainly composed of a vacuum chamber, a heating strip, a silicone strip and a vacuum pump. The vacuum pump sucks away the gas in the vacuum chamber to discharge the gas in the packaging bag placed in the vacuum chamber. The heating strip is moved by the lifting element. The heating strip and the silicone strip are combined to clamp the sealing part of the packaging bag. The temperature brought by the heating strip causes the packaging bag to melt and seal the packaging bag.

[0004] The vacuum packaging machines are becoming more and more targeted depending on the packaging products. The main reason is to improve the vacuum absorption capability. However, the heating strip is repeatedly powered on for heating. Due to the influence of thermal expansion and contraction, it will cause the heating strip to become longer. The installed heating strip will become loose, resulting in the degradation of the heat sealing quality of the packaging bag. In addition, the internal space of the vacuum chamber is fixed. The overall vacuum absorption space cannot be adjusted according to the volume of the packaging bag containing the product. The vacuum absorption time is long and the packaging efficiency is low. Based on the above practical problems in vacuum packaging, a stable vacuum absorption packaging equipment is introduced. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a vacuum packaging automatic line vacuum pumping device and a vacuum pumping method thereof, so as to solve the problems mentioned in the above background technology that the heating strip expands and becomes loose due to heat expansion, the heat sealing of the packaging bag is difficult to ensure, and the vacuum suction time is long.

[0006] To achieve the above objectives, the embodiments of the present invention provide the following technical solutions:

[0007] A vacuum packaging automatic line vacuum pumping device, comprising a workbench, a base plate, a vacuum pump, a conduit and a conveyor belt, wherein the base plate is fixedly connected to the bottom of the workbench, the vacuum pump is installed on the upper surface of the base plate, one end of the conduit is installed on the input end of the vacuum pump, and the conveyor belt is installed on the upper surface of the workbench along the left-right direction, and further comprising: a plurality of silicone strips, which are equidistantly installed on the outer wall of the conveyor belt along the front-back direction; a vacuum packaging mechanism, which is installed in the middle of the outer side of the upper surface of the workbench;

[0008] The vacuum packaging mechanism includes: four first lifting cylinders, two of which are installed in the middle of the front and rear sides of the upper surface of the workbench; a vacuum chamber, installed at the output end of the first lifting cylinder; a catheter joint, installed at the top center of the vacuum chamber, and the catheter joint is connected to the other end of the catheter; a heat sealing component, installed on the left side of the inner cavity of the vacuum chamber along the front-to-back direction; an electronic thermometer, installed on the upper surface of the vacuum chamber; two filling components, installed on the front and rear sides of the vacuum chamber.

[0009] As a further solution of the present invention: the purpose is to monitor the surface temperature of the heating strip, the heat sealing assembly includes: two second lifting cylinders, which are respectively installed at the front and rear ends of the left side of the inner cavity top of the vacuum chamber; a pressing plate, which is installed at the output end of the second lifting cylinder; a thermistor, which can be electrically connected to an electronic temperature meter, is installed at the center of the lower surface of the pressing plate;

[0010] It also includes: a first positioning pin, which is installed at the rear end of the pressure plate to stretch the heating strip and ensure that the heating strip always remains in a straight state; a slideway, which is at least two in number and is equidistantly arranged in the inner cavity of the pressure plate, and the two ends of the slideway are closed; a spring, which is inserted on the rear side of the inner cavity of the pressure plate; a limit rod, which can be inserted on the front side of the inner cavity of the pressure plate and can slide back and forth; sliders, which are the same in number as the slideways and can be inserted in the inner cavity of the slideways and are equidistantly installed on the rear side of the outer wall of the limit rod; a second positioning pin, which is installed on the front end of the lower surface of the pressure plate, and the outer wall of the second positioning pin is provided with a groove; two metal rings, which are respectively sleeved on the outer walls of the first positioning pin and the second positioning pin; a plug, which is installed on the inner wall of the metal ring, and the plug is inserted in the inner cavity of the groove; a heating strip, which is installed at the bottom of the metal ring, and the heating strip is in contact with the pressure plate.

[0011] As a further solution of the present invention: the pressing plate is parallel to the silica gel strip.

[0012] As a further solution of the present invention: a ceramic pad is installed at the front end of the limit rod.

[0013] As a further solution of the present invention: the purpose is to drive the push plate to move by changing the angle between the first connecting rod and the second connecting rod, thereby changing the volume of the rubber bag, the filling component includes: a shell, fixedly connected to the outer wall of the vacuum chamber; two first rotating shafts, which are respectively installed on the left and right sides of the inner cavity of the shell through bearings in the up and down directions; a first gear, which is installed in the middle of the outer wall of the first rotating shaft, and the two first gears are meshed and connected; four first connecting rods, each two in a group, are respectively fixedly connected to the upper and lower ends of the outer walls of the two first rotating shafts; one end of the second connecting rod is connected to the end of the first connecting rod away from the first rotating shaft through a pin shaft; the push plate is connected to the other end of the second connecting rod through a pin shaft; the rubber bag is bonded to the outer edge of the rear side of the shell, and the rear side of the inner cavity of the rubber bag is bonded to the rear side of the push plate;

[0014] The purpose is to position the second rotating shaft after rotation, and it also includes: the second rotating shaft, which is installed on the right side of the inner cavity of the shell through a bearing in the up and down direction; the second gear, which is installed in the middle of the outer wall of the second rotating shaft, and the second gear is meshed and connected with the first gear; the eccentric wheel, which is connected to the top of the outer wall of the second rotating shaft through a pin shaft; and the handle, which is installed on the outer wall of the eccentric wheel.

[0015] As a further solution of the present invention: the outer wall of the rubber bag is wavy and has the ability to expand and contract.

[0016] As a further solution of the present invention: the eccentric wheel is eccentrically mounted on the outer wall of the second rotating shaft, and the second rotating shaft can be positioned by pressing the eccentric wheel with a handle to squeeze the upper surface of the shell.

[0017] A vacuuming method for a vacuum packaging automatic line vacuuming device, comprising the following steps:

[0018] Step 1: The packaging bag containing the product is placed on the conveyor belt, and the sealing position of the packaging bag is on the silicone strip. The conveyor belt conveys the packaging bag from right to left, with the purpose of conveying the packaging bag to the bottom of the vacuum packaging mechanism;

[0019] Step 2: The first lifting cylinder drives the vacuum chamber to descend and fit with the conveyor belt to form a closed space. Under the suction force of the vacuum pump, the vacuum chamber is vacuumed to suck away the gas in the packaging bag;

[0020] Step 3: The second lifting cylinder drives the pressing plate to move downward, and the packaging bag is clamped with the cooperation of the silicone strip. The heating strip is powered on to heat up, so that the packaging bag is melted and the packaging bag is heat-sealed. The thermistor senses the temperature of the heating strip and displays the temperature of the heating strip in real time on the electronic thermometer, so that the staff can check whether the heat-sealing temperature can complete the sealing of the packaging bag.

[0021] Step 4: When the heating strip heats up and expands, the spring force pushes the limit rod forward, and the first positioning pin and the second positioning pin pull the heating strip to ensure that the heating strip remains horizontal and the sealing stability is ensured;

[0022] Step five, lift the handle to cause the eccentric wheel to flip up and separate from the upper surface of the shell, drive the second gear to rotate clockwise or counterclockwise, and cause the first gear on the right to rotate counterclockwise or clockwise. Since the two first gears are engaged, the two first gears rotate in opposite directions, and the two first connecting rods swing outward or inward synchronously. The second connecting rod moves with the first connecting rod, causing the push plate to move outward or inward, and the volume of the rubber bag becomes smaller or larger. The vacuum suction space of the vacuum chamber is changed according to the volume of the packaging bag, with the aim of shortening the vacuum suction time and improving packaging efficiency.

[0023] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0024] 1. The present invention senses the temperature of the heating strip through a thermal sensor, and the electronic temperature meter displays the temperature of the heating strip in real time. The slideway and the slider cooperate to limit the limit rod, and the limit rod is driven forward under the elastic force of the spring. The first positioning pin and the second positioning pin stretch the heating strip to ensure that the heating strip is always straight, prevent the heating strip from bending and failing to fully clamp the packaging bag, and improve the heat sealing quality of the packaging bag;

[0025] 2. The present invention drives the second shaft to rotate the second gear through the handle, and the two first gears rotate in the opposite direction, causing the two first connecting rods to swing in the opposite direction. The second connecting rod pulls the push plate to move outward or inward, so that the volume of the rubber bag becomes smaller or larger, and the internal space of the vacuum chamber becomes larger or smaller. Therefore, the overall vacuum suction space can be adjusted according to the volume of the product packaging bag, the vacuum suction time is short, and the packaging efficiency is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the vacuum packaging mechanism of the present invention;

[0028] Figure 3 It is a left side cross-sectional view of the vacuum packaging mechanism of the present invention;

[0029] Figure 4 This is an enlarged view of point A of the present invention;

[0030] Figure 5 This is an enlarged view of point B of the present invention;

[0031] Figure 6 A top view cross-sectional view of a filling assembly of the present invention;

[0032] Figure 7This is a front cross-sectional view of the filling component of the present invention.

[0033] In the figure: 1-working table, 2-substrate, 3-vacuum pump, 4-pipe, 5-conveyor belt, 6-silicone strip, 7-vacuum packaging mechanism, 71-first lifting cylinder, 72-vacuum chamber, 73-pipe joint, 74-heat sealing component, 75-electronic temperature gauge, 76-filling component, 741-second lifting cylinder, 742-pressing plate, 743-thermal sensor, 744-first positioning pin, 745-slideway, 746-spring Spring, 747-limit rod, 748-slider, 749-second positioning pin, 7410-metal ring, 7411-latch pin, 7412-heating strip, 761-housing, 762-first rotating shaft, 763-first gear, 764-first connecting rod, 765-second connecting rod, 766-push plate, 767-rubber bag, 768-second rotating shaft, 769-second gear, 7610-eccentric wheel, 7611-handle. DETAILED DESCRIPTION

[0034] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] Example 1

[0037] See also Figure 1-2 In an embodiment of the present invention, a vacuum packaging automatic line vacuum pumping device includes a workbench 1, a base plate 2, a vacuum pump 3, a conduit 4 and a conveyor belt 5. The base plate 2 is fixedly connected to the bottom of the workbench 1. The base plate 2 provides a space for placing tools and defective products. The vacuum pump 3 is installed on the upper surface of the base plate 2. The vacuum pump 3 is used to absorb the gas in the vacuum chamber 72. One end of the conduit 4 is installed at the input end of the vacuum pump 3. The conveyor belt 5 is installed on the upper surface of the workbench 1 along the left and right directions to allow the packaging bag containing the product to be conveyed from right to left. It also includes a silicone strip 6 and a vacuum packaging mechanism 7. The number of silicone strips 6 is several, which are equidistantly installed on the outer wall of the conveyor belt 5 along the front and rear directions to block the sealing of the packaging bag and prevent the product from being removed from the packaging bag; the vacuum packaging mechanism 7 is installed in the middle of the outer side of the upper surface of the workbench 1;

[0038] The vacuum packaging mechanism 7 includes a first lifting cylinder 71, a vacuum chamber 72, a catheter joint 73, a heat sealing assembly 74, an electronic thermometer 75 and a filling assembly 76. There are four first lifting cylinders 71, two of which are installed in a group at the middle of the front and rear sides of the upper surface of the workbench 1, respectively, to drive the vacuum chamber 72 to move up and down; the vacuum chamber 72 is installed at the output end of the first lifting cylinder 71; the catheter joint 73 is installed at the top center of the vacuum chamber 72, and the catheter joint 73 is connected to the other end of the catheter 4; the heat sealing assembly 74 is installed on the left side of the inner cavity of the vacuum chamber 72 along the front-to-back direction; the electronic thermometer 75 is installed on the upper surface of the vacuum chamber 72, and the electronic thermometer 75 is used to analyze the electrical signal fed back by the thermistor 743 and display the surface temperature of the heating strip 7412; there are two filling assemblies 76, which are installed at the front and rear sides of the vacuum chamber 72 respectively.

[0039] Further, such as Figure 3-5 As shown, the heat sealing assembly 74 includes a second lifting cylinder 741, a pressing plate 742 and a thermal sensor 743. There are two second lifting cylinders 741, which are respectively installed at the front and rear ends of the left side of the inner cavity top of the vacuum chamber 72 to drive the pressing plate 742 to move up and down; the pressing plate 742 is installed at the output end of the second lifting cylinder 741 to press the packaging bag downward; the thermal sensor 743 can be electrically connected to the electronic thermometer 75 and is installed at the center of the lower surface of the pressing plate 742. The thermal sensor 743 senses the temperature of the heating strip 7412;

[0040] The first positioning pin 744, a slide 745, a spring 746, a limit rod 747, a slider 748, a second positioning pin 749, a metal ring 7410, a plug 7411 and a heating strip 7412 are also included. The first positioning pin 744 is installed at the rear end of the pressing plate 742, and a groove is provided on the outer wall of the first positioning pin 744. The first positioning pin 744 plays a positioning role for the heating strip 7412, and the first positioning pin 744 plays a conductive role and is connected to a power source. The number of the slides 745 is at least two. The inner cavity of the pressure plate 742 is equidistantly opened, and the two ends of the slideway 745 are closed. The limit rod 747 is limited by the cooperation of the slideway 745 and the slider 748, which not only ensures the stability of the limit rod 747 moving forward and backward, but also prevents the limit rod 747 from moving out of the inner cavity of the pressure plate 742; the spring 746 is inserted at the rear side of the inner cavity of the pressure plate 742, and the elastic force of the spring 746 is used to drive the limit rod 747 to move forward; the limit rod 747 can be inserted at the front side of the inner cavity of the pressure plate 742 so as to slide forward and backward; The number of blocks 748 is the same as that of the slide 745, and they are equidistantly installed on the rear side of the outer wall of the limit rod 747 so as to be plugged into the inner cavity of the slide 745; the second positioning pin 749 is installed on the front end of the lower surface of the pressure plate 742, and the outer wall of the second positioning pin 749 is provided with a groove, and the second positioning pin 749 is used to pull the heating strip 7412 forward, and will not inhibit the thermal expansion and contraction of the heating strip 7412. The second positioning pin 749 has a conductive function and is connected to one end of the power supply; there are two metal rings 7410, which are respectively sleeved On the outer wall of the first positioning pin 744 and the second positioning pin 749, the metal ring 7410 has a conductive wire function; the plug pin 7411 is installed on the inner wall of the metal ring 7410, and the plug pin 7411 is plugged into the inner cavity of the groove to improve the stability of the metal ring 7410 and the first positioning pin 744 and the second positioning pin 749; the heating strip 7412 is installed at the bottom of the metal ring 7410, and the heating strip 7412 is in contact with the pressing plate 742, and the packaging bag is heat-sealed by heating the heating strip 7412 when it is powered on;

[0041] When the heating strip 7412 heats up and expands, the elastic force of the spring 746 pushes the limiting rod 747 forward, and the first positioning pin 744 and the second positioning pin 749 pull the heating strip 7412 to ensure that the heating strip 7412 remains horizontal and the sealing stability is ensured.

[0042] Furthermore, the pressing plate 742 is parallel to the silicone strip 6. When the pressing plate 742 moves downward, the pressing plate 742 and the silicone strip 6 can clamp the packaging bag to achieve full sealing of the packaging bag.

[0043] Furthermore, a ceramic pad is installed at the front end of the limit rod 747. The ceramic pad has the functions of insulation and heat insulation, which makes it convenient for the staff to push the limit rod 747 to move.

[0044] Further, such as Figure 6-7As shown, the filling assembly 76 includes a housing 761, a first rotating shaft 762, a first gear 763, a first connecting rod 764, a second connecting rod 765, a push plate 766 and a rubber bag 767. The housing 761 is fixedly connected to the outer wall of the vacuum chamber 72; there are two first rotating shafts 762, which are respectively installed on the left and right sides of the inner cavity of the housing 761 through bearings in the up and down directions; the first gear 763 is installed in the middle of the outer wall of the first rotating shaft 762, and the two first gears 763 are meshed and connected, and the two first gears 763 rotate in opposite directions, thereby realizing the synchronous reverse rotation of the two first connecting rods 764 Swing; there are four first connecting rods 764, each two in a group are fixedly connected to the upper and lower ends of the outer walls of the two first rotating shafts 762; one end of the second connecting rod 765 is connected to the end of the first connecting rod 764 away from the first rotating shaft 762 through a pin shaft, which plays a role in pushing the push plate 766; the push plate 766 is connected to the other end of the second connecting rod 765 through a pin shaft; the rubber bag 767 is bonded to the outer edge of the rear side of the shell 761, and the rear side of the inner cavity of the rubber bag 767 is bonded to the rear side of the push plate 766, and the internal space size of the vacuum chamber 72 is changed by changing the volume of the rubber bag 767;

[0045] It also includes a second rotating shaft 768, a second gear 769, an eccentric wheel 7610 and a handle 7611. The second rotating shaft 768 is installed on the right side of the inner cavity of the housing 761 through a bearing in the up-down direction; the second gear 769 is installed in the middle of the outer wall of the second rotating shaft 768, and the second gear 769 is meshed and connected with the first gear 763; the eccentric wheel 7610 is connected to the top of the outer wall of the second rotating shaft 768 through a pin shaft, and the outer wall of the eccentric wheel 7610 has a convex ridge to increase the friction force of contact with the surface of the housing 761; the handle 7611 is installed on the outer wall of the eccentric wheel 7610;

[0046] Lifting the handle 7611 causes the eccentric wheel 7610 to flip up and detach from the upper surface of the shell 761, driving the second gear 769 to rotate clockwise or counterclockwise, and causing the first gear 763 on the right side to rotate counterclockwise or clockwise. As the two first gears 763 are meshed, the two first gears 763 rotate in opposite directions, and the two first connecting rods 764 swing outward or inward synchronously. The second connecting rod 765 moves with the first connecting rod 764, causing the push plate 766 to move outward or inward, and the volume of the rubber bag 767 becomes smaller or larger. The vacuum suction space of the vacuum chamber 72 is changed according to the volume of the packaging bag, with the aim of shortening the vacuum suction time and improving the packaging efficiency.

[0047] Furthermore, the outer wall of the rubber bag 767 is wavy and has the ability to expand and contract. The wavy shape gives the rubber bag 767 the ability to expand and contract, and changes the size of the vacuum chamber 72 according to the volume of the packaging bag, thereby shortening the vacuum suction time.

[0048] Furthermore, the eccentric wheel 7610 is eccentrically installed on the outer wall of the second rotating shaft 768. The second rotating shaft 768 can be positioned by pressing the eccentric wheel 7610 downward with the handle 7611 to squeeze the upper surface of the shell 761, so as to position the second rotating shaft 768 after rotation.

[0049] The vacuuming method of the vacuuming device comprises the following steps:

[0050] Step 1: The packaging bag containing the product is placed on the conveyor belt 5, and the sealing position of the packaging bag is on the silicone strip 6. The conveyor belt 5 conveys the packaging bag from right to left, with the purpose of conveying the packaging bag to the bottom of the vacuum packaging mechanism 7;

[0051] Step 2: The first lifting cylinder 71 drives the vacuum chamber 72 to descend and fit with the conveyor belt 5 to form a closed space. Under the suction force of the vacuum pump 3, the vacuum chamber 72 is vacuumed to suck away the gas in the packaging bag;

[0052] Step three, the second lifting cylinder 741 drives the pressing plate 742 to move downward, and the packaging bag is clamped with the cooperation of the silicone strip 6. The heating strip 7412 is energized to heat up, so that the packaging bag is melted and the packaging bag is heat-sealed. The thermistor 743 senses the temperature of the heating strip 7412 and displays the temperature of the heating strip 7412 in real time on the electronic thermometer 75, so that the staff can check whether the heat-sealing temperature can complete the sealing of the packaging bag.

[0053] The above are only preferred embodiments of the present invention. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention. These should also be regarded as the protection scope of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A vacuum packaging automatic line vacuum pumping device, comprising a workbench (1), a base plate (2), a vacuum pump (3), a conduit (4) and a conveyor belt (5), wherein the base plate (2) is fixedly connected to the bottom of the workbench (1), the vacuum pump (3) is mounted on the upper surface of the base plate (2), one end of the conduit (4) is mounted on the input end of the vacuum pump (3), and the conveyor belt (5) is mounted on the upper surface of the workbench (1), characterized in that: Also includes: A plurality of silicone strips (6) are installed at equal intervals on the outer wall of the conveyor belt (5); A vacuum packaging mechanism (7) is installed in the middle of the outer side of the upper surface of the workbench (1); The vacuum packaging mechanism (7) comprises: Four first lifting cylinders (71) are installed in groups of two at the middle of the front and rear sides of the upper surface of the workbench (1); A vacuum chamber (72) installed at the output end of the first lifting cylinder (71); A conduit connector (73) is installed at the top center of the vacuum chamber (72), and the conduit connector (73) is connected to the other end of the conduit (4); A heat sealing assembly (74) installed on the left side of the inner cavity of the vacuum chamber (72); An electronic temperature gauge (75) mounted on the upper surface of the vacuum chamber (72); Two filling components (76) are installed on the front and rear sides of the vacuum chamber (72) respectively; The heat sealing assembly (74) comprises: There are two second lifting cylinders (741), which are respectively installed at the front and rear ends of the left side of the top of the inner cavity of the vacuum chamber (72); A pressing plate (742) installed at the output end of the second lifting cylinder (741); A thermal sensor (743) is installed at the center of the lower surface of the pressing plate (742), and the thermal sensor (743) is electrically connected to the electronic temperature meter (75); A first positioning pin (744) is installed at the rear end of the pressing plate (742), and a groove is formed on the outer wall of the first positioning pin (744); There are at least two slideways (745) which are equidistantly arranged in the inner cavity of the pressing plate (742), and both ends of the slideways (745) are closed; A spring (746) is inserted into the rear side of the inner cavity of the pressing plate (742); A limit rod (747) is inserted into the front side of the inner cavity of the pressing plate (742) so as to be slidable forward and backward; The number of the sliders (748) is the same as that of the slideways (745), and they are equidistantly mounted on the rear side of the outer wall of the limiting rod (747), and the sliders (748) are plugged into the inner cavity of the slideway (745); A second positioning pin (749) is mounted on the front end of the lower surface of the pressing plate (742), and a groove is formed on the outer wall of the second positioning pin (749); Two metal rings (7410) are respectively sleeved on the outer walls of the first positioning pin (744) and the second positioning pin (749); A latch (7411) is mounted on the inner wall of the metal ring (7410), and the latch (7411) is inserted into the inner cavity of the groove; A heating strip (7412) is installed at the bottom of the metal ring (7410), and the heating strip (7412) is in contact with the pressing plate (742); The filling component (76) includes: A housing (761) fixedly connected to an outer wall of the vacuum chamber (72); Two first rotating shafts (762) are respectively installed on the left and right sides of the inner cavity of the housing (761) through bearings; A first gear (763) is mounted on the middle portion of the outer wall of the first rotating shaft (762), and the two first gears (763) are meshed and connected; Four first connecting rods (764) are provided, with two connecting rods forming a group and respectively fixedly connected to the upper and lower ends of the outer walls of the two first rotating shafts (762); A second connecting rod (765), one end of which is connected to an end of the first connecting rod (764) away from the first rotating shaft (762) via a pin; A push plate (766) connected to the other end of the second connecting rod (765) via a pin; A rubber bag (767) is bonded to the outer edge of the rear side of the housing (761), and the rear side of the inner cavity of the rubber bag (767) is bonded to the rear side of the push plate (766); A second rotating shaft (768) is installed on the right side of the inner cavity of the housing (761) via a bearing in the up-down direction; A second gear (769) is mounted on the middle portion of the outer wall of the second rotating shaft (768), and the second gear (769) is meshingly connected with the first gear (763); An eccentric wheel (7610) connected to the top end of the outer wall of the second rotating shaft (768) via a pin; A handle (7611) is mounted on the outer wall of the eccentric wheel (7610).

2. A vacuum packaging automatic line vacuum pumping device according to claim 1, characterized in that: The pressing plate (742) is parallel to the silicone strip (6).

3. The vacuum packaging automatic line vacuum pumping device according to claim 2, characterized in that: A ceramic pad is installed at the front end of the limiting rod (747).

4. The vacuum packaging automatic line vacuum pumping device according to claim 3, characterized in that: The outer wall of the rubber bag (767) is wavy and has the ability to expand and contract.

5. The vacuum packaging automatic line vacuum pumping device according to claim 4, characterized in that: The eccentric wheel (7610) is eccentrically mounted on the outer wall of the second rotating shaft (768), and the second rotating shaft (768) can be positioned by pressing the eccentric wheel (7610) downward with a handle (7611) to squeeze the upper surface of the housing (761).

6. A vacuuming method for a vacuum packaging automatic line, which is applied to a vacuuming device for a vacuum packaging automatic line as claimed in claim 5, characterized in that: The following steps are involved: Step 1: The packaging bag containing the product is placed on the conveyor belt (5), and the sealing position of the packaging bag is located on the silica gel strip (6). The conveyor belt (5) conveys the packaging bag from right to left, with the purpose of conveying the packaging bag to the bottom of the vacuum packaging mechanism (7); Step 2: The first lifting cylinder (71) drives the vacuum chamber (72) to descend and fit with the conveyor belt (5) to form a closed space. Under the suction force of the vacuum pump (3), the vacuum chamber (72) is vacuumed, thereby sucking away the gas in the packaging bag; Step 3: The second lifting cylinder (741) drives the pressing plate (742) to move downward, and the packaging bag is clamped with the cooperation of the silicone strip (6). The heating strip (7412) is powered on to increase the temperature, so that the packaging bag is melted and the packaging bag is heat-sealed. The thermistor (743) senses the temperature of the heating strip (7412) and displays the temperature of the heating strip (7412) in real time on the electronic thermometer (75), so that the staff can check whether the heat-sealing temperature can complete the sealing of the packaging bag. Step 4: When the heating strip (7412) heats up and expands, the elastic force of the spring (746) pushes the limit rod (747) forward, and the first positioning pin (744) and the second positioning pin (749) pull the heating strip (7412) to ensure that the heating strip (7412) remains horizontal, thereby ensuring sealing stability; Step 5: Lift the handle (7611) to cause the eccentric wheel (7610) to flip up and separate from the upper surface of the shell (761), driving the second gear (769) to rotate clockwise or counterclockwise, which can cause the first gear (763) on the right to rotate counterclockwise or clockwise. Since the two first gears (763) are meshed, the two first gears (763) rotate in opposite directions, and the two first connecting rods (764) swing outward or inward synchronously. The second connecting rod (765) moves with the first connecting rod (764), causing the push plate (766) to move outward or inward, and the volume of the rubber bag (767) becomes smaller or larger. The vacuum suction space of the vacuum chamber (72) is changed according to the volume of the packaging bag, so as to shorten the vacuum suction time and improve the packaging efficiency.

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