A bottom-pumping vacuum packaging machine

Abstract

The present invention discloses a bottom-pumping vacuum packaging machine, wherein the lower vacuum chamber assembly comprises a first and a second gas circuit plate arranged in the upper and lower parts, wherein the first and the second gas circuit plates are provided with a first gas circuit for extracting the air between the lower film and the groove and a second gas circuit for extracting the air between the upper and lower films; a first gas circuit interface connected to the first gas circuit and a second gas circuit interface connected to the second gas circuit are respectively provided at the lower part of the second gas circuit; the formed lower film is placed in a groove on the first gas circuit plate that matches the shape of the lower film, and the upper film is placed on the upper part of the lower film at the lower part of the upper vacuum chamber assembly. In this way, the air between the lower film and the groove is extracted by the first gas circuit on the lower vacuum chamber assembly to fix the lower film, and the air between the upper and lower films is extracted by the second gas circuit to vacuumize the packaged object between the upper and lower films, and the upper film is heated by the upper vacuum chamber assembly to achieve film sealing, thereby achieving the packaging of liquid or fluid.

Description

Technical Field

[0001] The invention belongs to the technical field of packaging, and in particular relates to a bottom-pumping vacuum packaging machine. Background Art

[0002] The vacuum packaging machines currently used in China all use upward suction as the vacuum pumping method. During the vacuuming process, a lot of granular residue will remain and block the air path, which is not easy to clean. In addition, for vacuum-packed liquid packaging materials, the air pressure is close to absolute vacuum during the vacuuming process, and the liquid will boil under low pressure. The upward suction equipment will extract the boiling liquid. Summary of the invention

[0003] Therefore, the main object of the present invention is to provide a bottom-pumping vacuum packaging machine for packaging liquids.

[0004] The present invention discloses a bottom-pumping vacuum packaging machine, which comprises a frame 4, an upper vacuum chamber assembly 1 fixedly mounted on the frame 4, a lower vacuum chamber assembly 2 arranged below the upper vacuum chamber assembly 1, and a driving assembly 3 connected to the frame 4 and driving the lower vacuum chamber assembly 2 to rise and fall.

[0005] The lower vacuum chamber assembly 2 comprises a first and a second gas path plate 21, 24 arranged in a vertical direction, wherein the first and the second gas path plates 21, 24 are provided with a first gas path for extracting air between the lower film and the groove 211 and a second gas path for extracting air between the upper and lower films;

[0006] A first gas path interface 25 connected to the first gas path and a second gas path interface 26 connected to the second gas path are respectively provided at the lower part of the second gas path plate 24;

[0007] The formed lower film is placed in a groove 211 on the first gas path plate 21 which matches the shape of the lower film, and the upper film is arranged on the upper part of the lower film at the lower part of the upper vacuum chamber assembly 1 .

[0008] From above, the air between the lower film and the groove 211 is extracted through the first air path on the lower vacuum chamber assembly 2 to fix the lower film, and the air between the upper and lower films is extracted through the second air path to vacuum the packaged material between the upper and lower films, and the upper film is heated by the upper vacuum chamber assembly 1 to achieve film sealing, thereby realizing the packaging of liquids or fluids.

[0009] Preferably, at least one groove 211 is provided on the upper surface of the first gas path plate 21, a plurality of first air holes 212 penetrating the thickness of the first gas path plate 21 are provided on the bottom surface of the groove, a plurality of second air holes 213 penetrating the bottom are respectively provided on the two width sides of the first gas path plate 21 along the width direction, and a first air groove 214 communicating with the second air holes 213 is provided on the lower surface of the first gas path plate 21;

[0010] A second air groove 241 communicating with the first air hole 212 is provided on the upper surface of the second air path plate 24;

[0011] The second gas path plate is further provided with a third gas hole 242 communicating with the first gas path interface 25 and a fourth gas hole 243 communicating with the second gas path interface 26 , wherein the third gas hole 242 is communicated with the second gas groove 241 .

[0012] From the above, the air between the lower film and the groove passes through the first air hole 212, the second air groove 241 arranged on the second air path plate and connected to the first air hole 212, the third air hole 242 arranged on the second air path plate and connected to the second air groove 241, and the first air path interface 25 connected to the third air hole 242 and the external first vacuum pump to form a first air path to extract the air between the lower film and the groove, so that the lower film is stable and convenient for extracting the air between the upper and lower films;

[0013] A second air circuit is formed by a second air hole 213 arranged on the first air circuit plate, a first air groove 214 arranged on the lower surface of the first air circuit plate 21 and connected to the second air hole 213, a fourth air hole 243 arranged on the second air circuit plate and connected to the first air groove 214, a second air circuit interface 26 connected to the fourth air hole 243, and a second vacuum pump arranged at the lower part of the second air circuit plate and connected to the second air circuit interface 26 to extract the air between the upper and lower membranes and make the space between the upper and lower membranes evacuated.

[0014] Preferably, the first air groove 214 includes parallel first and second transverse air grooves 2141, 2142 and a first longitudinal air groove 2143 vertically connected to the transverse air grooves, which together form an I-shape. The first and second transverse air grooves are connected to the second air hole 213 arranged on one side of the first air path plate 21, and the third transverse air groove 2143 is arranged on one side of the first longitudinal air groove 2143 and is vertically connected thereto.

[0015] Preferably, the second gas groove 241 comprises:

[0016] Three parallel and spaced fourth to sixth transverse air grooves 2411-2413 and a second longitudinal air groove 2414 vertically connected to the three transverse air grooves, a third longitudinal air groove 2415 vertically connected to the end is respectively arranged at both ends of each transverse air groove near the end, and forms a cross structure with the end of the transverse air groove, and the first air hole 212 corresponds to the two ends of the third longitudinal air groove 2415 in upper and lower positions;

[0017] A seventh transverse air branch groove 2416 is further provided on one side of the second longitudinal air branch groove 2414 between the fourth and fifth transverse air branch grooves 2411 and 2412 and is vertically connected to the second longitudinal air branch groove 2414;

[0018] The third air hole 242 and the fourth air hole 243 are respectively arranged on both sides of one end of the second transverse air groove 2412 , and the third air hole 242 is connected to the other end of the seventh longitudinal air groove 2417 .

[0019] Preferably, the first gas circuit includes: the first air hole 212 provided on the first gas circuit plate 21, the second gas groove 241 provided on the second gas circuit plate 24, the third air hole 242, the first gas circuit interface 25 and a first vacuum pump;

[0020] The second gas circuit includes: the second gas hole 213 provided on the first gas circuit plate 21 , the first gas groove 214 , the fourth gas hole 243 provided on the second gas circuit plate 24 , the second gas circuit interface 26 , and a second vacuum pump.

[0021] From above, the air between the lower film and the groove is extracted through the first air path, so that the lower film is stable and it is convenient to extract the air between the upper and lower films; the air between the upper and lower films is extracted through the second air path, so that the space between the upper and lower films is vacuumized.

[0022] Preferably, the upper vacuum chamber assembly 1 comprises a driving plate 13, at least one piston 12 is fixedly disposed on the upper surface of the driving plate 13, and a plurality of spring holes 131 are disposed on the driving plate 13:

[0023] A bolt 1311 with a bolt rod facing upward and a spring 1312 surrounding the outside of the bolt 1311 are arranged in the through hole 1314 of the spring hole 131, the head of the bolt 1311 is fixedly connected to the driving plate, the bolt rod is fixedly connected to the upper component shell 11 arranged on the upper part of the driving plate 13, the lower end of the spring 1312 is fixedly connected to the driving plate, and the upper end is clamped on the step 13141 in the through hole 1314.

[0024] From above, the bolt rod is fixedly connected to the upper component housing 11, and the bolt head is fixedly connected to the drive plate. When the air pressure acting on the piston forces the piston to press the drive plate downward, the spring arranged in the through hole 1314 is compressed, and the drive plate descends to seal the upper and lower membranes.

[0025] Preferably, a sealing plate 15 is fixedly connected to the lower portion of the driving plate 13 , and a heating device is disposed in a housing 151 of the sealing plate 15 .

[0026] Preferably, the heating device includes at least one heating fixture 152 disposed in the housing 151 of the sealing plate 15 , and two heating rods are disposed in each heating fixture 152 .

[0027] From above, heating is performed by a heating rod arranged in the heating furniture 152, and the heating furniture 152 is arranged in the sealing plate 15, so that the sealing plate 15 heats the upper film and seals the upper and lower films together.

[0028] Preferably, the driving assembly 3 includes a cylinder 31 and a connecting rod mechanism driven by the cylinder 31 to move up and down, the connecting rod mechanism includes a plurality of connecting rods arranged on both sides of the cylinder 31 and parallel to its extending direction and a plurality of connecting shafts connecting the connecting rods on both sides, and the lower vacuum chamber assembly 2 is arranged on the connecting rod mechanism.

[0029] When the extension rod of the cylinder 31 is extended from above, the driving connecting rod mechanism rises, and the lower vacuum chamber assembly arranged on the connecting rod mechanism rises, the upper and lower vacuum chamber assemblies fit together, and the upper and lower films are pressed tightly. The air pressure on the piston forces the driving plate and the sealing plate to descend, heats the upper film and applies pressure to the upper and lower films, so that the upper and lower films are bonded together.

[0030] Preferably, the connecting rod on each side includes the first to fourth connecting rods 3211-3214, the first connecting rod 3211 is provided with two ends and three connection points in the middle, the connecting shaft includes a first connecting shaft 3221 which is sleeved with the piston rod of the cylinder 31 in the middle and connected to the first ends of the two first connecting rods 3211 at both ends, a second connecting shaft 3222 which is arranged on the upper part of the first connecting shaft 3221 and fixed at both ends and sleeved with the middle connection points of the two first connecting rods on the inner sides of both ends, a third connecting shaft 3223 which is arranged on the upper part of the second connecting shaft 3222 and connected to the ends of the two first connecting rods and one end of the two second connecting rods 3212 at both ends, and A fourth connecting shaft 3224 is arranged at the same height as the third connecting shaft, and its two ends are respectively connected to the other ends of the two second connecting rods 3212 and one end of the two third connecting rods 3213; a fifth connecting shaft 3225 is arranged at the upper part of the servo hydraulic cylinder and the lower part of the fourth connecting shaft, and its two ends are fixed and the other ends of the two third connecting rods are respectively sleeved on the inner sides of its two ends; the two fourth connecting rods 3214 are parallel and arranged perpendicularly to the first to fifth connecting shafts; one end of the two fourth connecting rods is sleeved on the sixth connecting shaft 3226 fixedly arranged on the upper part of the fifth connecting shaft, and rotates around the sixth connecting shaft, and the middle part and the other end thereof are respectively fixedly connected to the third and fourth connecting shafts. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a bottom-pumping vacuum packaging machine of the present invention;

[0032] Figure 2 It is a structural schematic diagram of the upper component housing of the present invention;

[0033] Figure 3 It is a schematic diagram of the structure of the driving plate and the sealing plate of the present invention;

[0034] Figure 4 It is a structural schematic diagram of the spring hole of the present invention;

[0035] Figure 5 It is a structural schematic diagram of the sealing plate of the present invention;

[0036] Figure 6 It is a structural schematic diagram of the lower vacuum chamber assembly of the present invention;

[0037] Figure 7 A top view of the first gas circuit board of the present invention;

[0038] Figure 8 It is a schematic diagram of the bottom structure of the first gas circuit board of the present invention;

[0039] Fig. 9 is a top view of the second gas circuit board of the present invention;

[0040] Fig.10 It is a schematic diagram of the structure of the driving assembly of the present invention. DETAILED DESCRIPTION

[0041] like Figure 1 The bottom-pumping vacuum packaging machine shown includes a frame 4, an upper vacuum chamber assembly 1 fixedly arranged on the frame 4, a lower vacuum chamber assembly 2 arranged at the lower part of the upper vacuum chamber assembly 1, and a driving assembly 3 connected to the frame 4 and driving the lower vacuum chamber assembly 2 to rise and fall.

[0042] Upper vacuum chamber assembly 1

[0043] Figure 2 Schematic diagram of the structure of the upper component housing 11 of the upper vacuum chamber assembly 1. Two grooves 111 matching the tops of two pistons described later are arranged on the inner side of the bottom surface of the upper component housing 11, and an air inlet hole 112 is arranged at the center of each groove 111;

[0044] Figure 3 For the components that are buckled in the upper component housing 11, according to Figure 3 As shown, a driving plate 13, a connecting plate 14 and a sealing plate 15 are sequentially arranged from top to bottom, two pistons 12 are arranged on the driving plate 13 at the upper part, and 12 spring holes 131 are symmetrically arranged on the driving plate 13. Figure 4 The structural diagram of the spring hole 131 is shown in FIG. A bolt 1311 and a spring 1312 surrounding the outside of the bolt 1311 are arranged in the through hole 1314. The bolt rod of the bolt 1311 is arranged upward, and the bolt rod is fixedly connected to the upper assembly housing 11. The bolt head is fixedly connected to the connecting plate 1313. The lower end of the spring 1312 is fixedly connected to the connecting plate 1313, and the upper end is stuck on the step of the through hole 1314. When 0.6MP gas comes in from the air inlet 112 and acts on the two pistons 12, when the force acting on the pistons 12 is greater than the spring force of the spring 1312, the driving plate 13, the connecting plate 14 and the sealing plate 15 are lowered together to heat and seal the packaging bag under the sealing plate 15. When the air inlet 112 is no longer flowing, the driving plate 13, the connecting plate 14 and the sealing plate 15 are raised and reset together under the action of the spring 1312.

[0045] Figure 5 This is a schematic diagram of the structure of the sealing plate 15. Four heating clamps 152 are fixedly arranged in the sealing plate shell 151. Each heating clamp 152 is provided with two heating holes 153 for placing heating rods. The heating rods are heated in the heating clamps 152, and the sealing plate shell 151 is heated. When moving downward, the packaging material on the lower component is heated and sealed.

[0046] Lower vacuum chamber assembly 2

[0047] like Figure 6As shown in the figure, the lower vacuum chamber assembly 2 includes a lower vacuum chamber housing 22, a first gas path plate 21 disposed on the upper end surface of the lower vacuum chamber housing 22, a baffle 23 disposed at the lower part of the lower vacuum chamber housing 22, a second gas path plate 24 disposed at the lower part of the baffle 23, and a first gas path interface 25 and a second gas path interface 26 disposed at the lower part of the second gas path plate 24 and connected thereto.

[0048] Figure 7 FIG. 4 is a schematic structural diagram of the first gas path plate 21. The first gas path plate 21 is a square plate. Three grooves 211 adapted to the shape of the formed lower film are provided at the middle position of the first gas path plate 21. The lower film is disposed closely on the upper surface of the grooves 211. Four first air holes 212 penetrating the bottom are symmetrically provided at the bottom of each groove 211. Five second air holes 213 penetrating the bottom are respectively provided on the two width sides of the first gas path plate 21. An I-shaped first gas groove 214 communicating all the second air holes 213 is provided on the outer side surface of the bottom of the first gas path plate 21. As Figure 8 shown in FIG. 5, it includes two parallel first and second transverse gas grooves 2141-2142 and a longitudinal gas groove 2143 vertically connecting the two transverse gas grooves 2141-2142. Each transverse gas groove communicates with the five second air holes 213 provided on the width side of the first gas path plate 21. A third transverse gas groove 2143 is provided on one side of the longitudinal gas groove 2143 and is vertically communicated therewith.

[0049] Fig. 9 FIG. 10 is a schematic structural diagram of the second gas path plate 24. It is disposed at the lower part of the baffle 23. A second gas groove 241 integrally in the shape of a "king" character and communicating with each first air hole 212 is provided on its upper surface. The second gas groove 241 includes three parallel fourth to sixth transverse gas grooves 2411-2413 and a second longitudinal gas groove 2414 vertically connected to the middle parts of the three transverse gas grooves. A third longitudinal gas groove 2415 perpendicular to the end is respectively provided at a position close to the end on both sides of each transverse gas groove. The third longitudinal gas groove 2415 and the end of each transverse gas groove form a cross-shaped structure. The first air hole 212 and the two ends of the small longitudinal gas groove are respectively vertically corresponding. A third air hole 242 connecting the first gas path interface 25 and a fourth air hole 243 connecting the second gas path interface 26 are respectively provided on both sides of one end of the second transverse gas groove 2412. A seventh transverse gas groove 2416 vertically communicated with the second longitudinal gas groove 2414 is further provided on one side of the second longitudinal gas groove 2414 between the fourth and fifth transverse gas grooves. The third air hole 242 communicates with the other end of the seventh longitudinal gas groove 2417.

[0050] During operation, the first air circuit interface 25 is connected to the vacuum pump, and the vacuum pump draws air. The third air hole 242 is connected to each first air hole 212 through the second air groove 241, and the air between the lower film and the vacuum chamber shell 22 is extracted, so that the lower film is close to the vacuum chamber shell 22, which is convenient for fixing the lower film and extracting the air between the upper and lower films; the second air circuit interface 26 is also connected to the vacuum pump. When the vacuum pump extracts air, the second air circuit interface 26 is connected to the first air groove 214, and the first air groove 214 is connected to each second air hole 213. Each horseshoe hole on the lower film corresponds to each second air hole 213 up and down, so that the air between the upper and lower films can be extracted, so that the packaging between the upper and lower films is in a vacuum state.

[0051] Drive component 3

[0052] Fig.10 32 is a structural diagram of a driving assembly 3, which includes a cylinder 31 and a connecting rod mechanism 32 driven by the cylinder 31 to move up and down, the connecting rod mechanism 32 includes connecting rods arranged on both sides and a connecting shaft connecting the connecting rods on both sides, wherein the connecting rods on each side include a first connecting rod 3211, a second connecting rod 3212, a third connecting rod 3213 and a fourth connecting rod 3214, wherein the first connecting rod 3211 is in a bent state, and has three connecting points at the first and second ends and the middle, the connecting shaft includes a first connecting shaft 3221 connected to the piston rod of the cylinder 31 and connecting the head ends of the two first connecting rods 3211, a second connecting shaft 3221 fixedly arranged and connected to the middle connecting point of the two first connecting rods 3211 A connecting shaft 3222, a third connecting shaft 3223 connecting the ends of the two first connecting rods 3211 and one end of the two second connecting rods 3212, a fourth connecting shaft 3224 connecting the other ends of the two second connecting rods 3212 and one end of the two third connecting rods 3213, and a fifth connecting shaft 3225 connected to the other ends of the two third connecting rods 3213 and fixedly arranged, the fourth connecting rod 3214 is two parallel connecting rods, the two connecting rods are mounted on a fixed sixth connecting shaft 3226 and rotate around the sixth connecting shaft 3226, and the middle part and the other end of the two connecting rods are respectively fixedly connected to the fourth connecting shaft 3224 and the third connecting shaft 3223.

[0053] When the piston rod of the cylinder 31 extends, it pushes the first connecting shaft 3221 forward, and the first connecting rods 3211 installed at both ends of the first connecting shaft 3221 rotate around the fixed second connecting shaft, so that the third connecting shaft 3223 moves in the opposite direction of the first connecting shaft 3221 and in the upward direction. Since the fifth connecting shaft 3225 and the sixth connecting shaft 3226 are fixed, the movement of the third connecting shaft 3223 forces the fourth connecting shaft 3224 to move only upward, and at the same time, the third connecting shaft 3223 moves upward, and the lower vacuum chamber assembly 2 arranged on the fourth connecting rod 3214 moves upward. When the molding lower mold on the lower membrane assembly shell contacts the upper membrane at the lower part of the upper assembly, the sealing plate on the upper assembly 1 moves downward to seal the upper and lower membranes together.

[0054] The lower film makes intermittent motion according to the pitch. When the formed lower film moves to the position of the lower component shell on the vacuum lower component 2, the ejector pin 1 (not marked in the figure) corresponds to the horseshoe hole on the lower film one by one, and the horseshoe hole on the lower film corresponds to the second air hole 213 on the first air circuit plate 21 one by one. In this way, an air suction hole and a gas circuit are generated between the upper and lower membranes, and the air between the upper and lower membranes is sucked out by the vacuum pump connected to the second air circuit interface 26.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bottom-pumping vacuum packaging machine, comprising a frame (4), an upper vacuum chamber assembly (1) fixedly mounted on the frame (4), a lower vacuum chamber assembly (2) arranged below the upper vacuum chamber assembly (1), and a driving assembly (3) connected to the frame (4) and driving the lower vacuum chamber assembly (2) to rise and fall, characterized in that: The lower vacuum chamber assembly (2) comprises a first and a second gas path plate (21, 24) arranged one above the other, at least one groove (211) being arranged on the upper surface of the first gas path plate (21), and a first gas path for extracting air between the lower film and the groove (211) and a second gas path for extracting air between the upper and lower films being arranged on the first and the second gas path plates (21, 24); A first gas path interface (25) connected to the first gas path and a second gas path interface (26) connected to the second gas path are respectively arranged at the lower part of the second gas path plate (24); The formed lower film is placed in the groove (211) on the first gas path plate (21) that matches the shape of the lower film, and the upper film is arranged at the lower part of the upper vacuum chamber assembly (1) and is located above the lower film. A plurality of first air holes (212) penetrating the thickness of the first air path plate (21) are arranged on the bottom surface of the groove, a plurality of second air holes (213) penetrating the bottom are arranged respectively along the width direction on two width sides of the first air path plate (21), and a first air groove (214) communicating with the second air holes (213) is arranged on the lower surface of the first air path plate (21); A second air groove (241) communicating with the first air hole (212) is provided on the upper surface of the second air path plate (24); The second gas path plate is also provided with a third gas hole (242) connected to the first gas path interface (25) and a fourth gas hole (243) connected to the second gas path interface (26), wherein the third gas hole (242) is connected to the second gas groove (241).

2. The bottom-pumping vacuum packaging machine according to claim 1, characterized in that: The first air groove (214) comprises parallel first and second transverse air grooves (2141-2142) and a first longitudinal air groove (2143) vertically connected to the transverse air grooves, together forming an I-shaped shape; the first and second transverse air grooves are connected to the second air hole (213) arranged on one side of the first air path plate (21); and the third transverse air groove (2144) is arranged on one side of the first longitudinal air groove (2143) and vertically connected thereto.

3. The bottom-pumping vacuum packaging machine according to claim 1, characterized in that: The second gas groove (241) comprises: Three parallel and spaced fourth to sixth transverse air grooves (2411-2413) and a second longitudinal air groove (2414) vertically connected to the three transverse air grooves, a third longitudinal air groove (2415) vertically connected to the end is respectively arranged at both ends of each transverse air groove near the end, and forms a cross-shaped structure with the end of the transverse air groove, and the first air hole (212) corresponds to the two ends of the third longitudinal air groove (2415) in the upper and lower directions; A seventh transverse air branch groove (2416) vertically connected to the second longitudinal air branch groove (2414) is further provided on one side of the second longitudinal air branch groove (2414) between the fourth and fifth transverse air branch grooves (2411, 2412); The third air hole (242) and the fourth air hole (243) are respectively arranged on both sides of one end of the fifth transverse air groove (2412), and the third air hole (242) is connected to the other end of the seventh transverse air groove (2416).

4. The bottom-pumping vacuum packaging machine according to claim 3, characterized in that: The first gas circuit comprises: the first gas hole (212) arranged on the first gas circuit plate (21), the second gas groove (241) arranged on the second gas circuit plate (24), the third gas hole (242), the first gas circuit interface (25) and a first vacuum pump; The second gas circuit comprises: the second gas hole (213) arranged on the first gas circuit plate (21), the first gas groove (214), the fourth gas hole (243) arranged on the second gas circuit plate (24), the second gas circuit interface (26) and a second vacuum pump.

5. The bottom-pumping vacuum packaging machine according to claim 1, characterized in that: The upper vacuum chamber assembly (1) comprises a driving plate (13), at least one piston (12) is fixedly arranged on the upper surface of the driving plate (13), and a plurality of spring holes (131) are arranged on the driving plate (13): A bolt (1311) with a bolt rod facing upward and a spring (1312) surrounding the outside of the bolt (1311) are arranged in the through hole (1314) of the spring hole (131); the head of the bolt (1311) is fixedly connected to the drive plate, the bolt rod is fixedly connected to an upper component housing (11) arranged on the upper part of the drive plate (13); the lower end of the spring (1312) is fixedly connected to the drive plate, and the upper end is clamped on a step (13141) in the through hole (1314).

6. The bottom-pumping vacuum packaging machine according to claim 5, characterized in that: A sealing plate (15) is fixedly connected to the lower part of the driving plate (13), and a heating device is arranged in a shell (151) of the sealing plate (15).

7. The bottom-pumping vacuum packaging machine according to claim 6, characterized in that: The heating device comprises at least one heating fixture (152) arranged in a shell (151) of the sealing plate (15), and two heating rods are arranged in each heating fixture (152).

8. The bottom-pumping vacuum packaging machine according to claim 1, characterized in that: The driving assembly (3) comprises a servo hydraulic cylinder (31) and a connecting rod mechanism driven by the servo hydraulic cylinder (31) to move up and down, the connecting rod mechanism comprising a plurality of connecting rods arranged on both sides of the servo hydraulic cylinder (31) and parallel to its extension direction and a plurality of connecting shafts connecting the connecting rods on both sides, and the lower vacuum chamber assembly (2) is arranged on the connecting rod mechanism.

9. The bottom-pumping vacuum packaging machine according to claim 8, characterized in that: The connecting rods on each side include first to fourth connecting rods (3211-3214), the first connecting rod (3211) is provided with two ends and three connection points in the middle, the connecting shaft includes a first connecting shaft (3221) which is sleeved with the piston rod of the servo hydraulic cylinder (31) in the middle and connected to the first ends of the two first connecting rods (3211) at both ends, a second connecting shaft (3222) which is arranged on the upper part of the first connecting shaft (3221) and fixed at both ends and sleeved with the middle connection points of the two first connecting rods on the inner sides of both ends, and a third connecting shaft (3223) which is arranged on the upper part of the second connecting shaft (3222) and connected to the ends of the two first connecting rods and one end of the two second connecting rods (3212) at both ends. ), a fourth connecting shaft (3224) is arranged at the same height as the third connecting shaft, and its two ends are respectively connected to the other ends of the two second connecting rods (3212) and one end of the two third connecting rods (3213); a fifth connecting shaft (3225) is arranged at the upper part of the servo hydraulic cylinder and the lower part of the fourth connecting shaft, and its two ends are fixed and the inner sides of its two ends are respectively sleeved on the other ends of the two third connecting rods, the two fourth connecting rods (3214) are parallel and arranged perpendicular to the first to fifth connecting shafts, one end of the two fourth connecting rods is sleeved on the sixth connecting shaft (3226) fixedly arranged on the upper part of the fifth connecting shaft, and rotates around the sixth connecting shaft, and the middle part and the other end thereof are respectively fixed to the third and fourth connecting shafts.

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