Vacuum Encapsulation Packaging Equipment

Abstract

The present invention belongs to the technical field of packaging equipment, and particularly relates to a vacuum packaging equipment, which includes a chassis, a conveying mechanism, a mounting frame, a lifting mechanism, a sealing cover, a heat-sealing assembly, and a negative pressure mechanism; the conveying mechanism and the mounting frame are arranged on the chassis; two clearance openings are provided at the bottom end of the mounting frame to allow the packaging bag on the conveying mechanism to pass through the clearance openings; the lifting mechanism is arranged at the upper end of the mounting frame, the sealing cover is connected to the lifting mechanism, and the lifting mechanism is used to drive the bottom of the sealing cover to fit on the conveying surface of the conveying mechanism and form a closed cavity, the negative pressure mechanism is connected to the closed cavity through a pipeline and is used to extract the air in the closed cavity; the heat-sealing assembly is connected in the closed cavity formed by the sealing cover and is used to heat-seal the bag mouth of the packaging bag. The packaging bag is conveyed to the bottom of the sealing cover by the conveying mechanism. Since the lifting mechanism drives the sealing cover to descend to seal the packaging bag, and then the negative pressure mechanism evacuates the air, the air in the packaging bag is discharged and heat-sealed, realizing automatic heat-sealing packaging and improving the efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of packaging equipment, and particularly relates to a vacuum packaging equipment. Background Art

[0002] At present, many products need vacuum packaging during packaging. Firstly, it can play a certain protective role for the products. Secondly, it can reduce the overall volume after packaging and save space, such as the encapsulation of circuit boards. Currently, during packaging, the product is put into a packaging bag. After manually inserting the bag mouth of the packaging bag into a vacuum heat-sealing machine to exhaust the air in the packaging bag, it is then heat-sealed. Relying on manual operation, the workload is large and the efficiency is low. Summary of the Invention

[0003] The purpose of the present invention is to provide a vacuum packaging equipment, which solves the problems that the existing vacuum pumping and heat sealing of packaging bags rely on manually inserting the bag mouth of the packaging bag into a vacuum heat-sealing machine, with a large workload and low efficiency.

[0004] To achieve the above purpose, a vacuum packaging equipment provided by an embodiment of the present invention includes a chassis, a conveying mechanism, a mounting frame, a lifting mechanism, a sealing cover, a heat-sealing component, and a negative pressure mechanism; the conveying mechanism and the mounting frame are arranged on the chassis; two clearance openings are provided at the bottom end of the mounting frame to allow the packaging bag on the conveying mechanism to pass through the clearance openings; the lifting mechanism is arranged at the upper end of the mounting frame, the sealing cover is connected to the lifting mechanism, and the lifting mechanism is used to drive the bottom of the sealing cover to fit on the conveying surface of the conveying mechanism and form a closed cavity. The negative pressure mechanism is connected to the closed cavity through a pipeline and is used to extract the air in the closed cavity; the heat-sealing component is connected in the closed cavity formed by the sealing cover and is used to heat-seal the bag mouth of the packaging bag.

[0005] Further, the conveying mechanism is a belt conveying mechanism, and a backing plate is further arranged on the chassis. The backing plate extends into the inner side of the belt of the belt conveying mechanism and is used to support the pressing sealing cover.

[0006] Further, one end of the backing plate extends out from between the inner sides of the belt of the belt conveying mechanism to form a mounting portion; one bottom edge of the pressing sealing cover is supported on the mounting portion; the heat-sealing component includes a heating strip, a support strip, and a lifting mechanism; the heating strip is fixedly installed on the inner side of the sealing cover, the lifting mechanism is arranged at the bottom end of the mounting portion, and the mounting portion is provided with a clearance groove for clearing the lifting end of the lifting mechanism. The support strip is arranged at the lifting end of the lifting mechanism; the support strip is used to support the bag mouth of the packaging bag, the lifting mechanism lifts the support strip, and the support strip and the heating strip clamp and hot-press the packaging bag.

[0007] Further, when the lifting mechanism pulls down the support bar and sinks it into the clearance groove, the upper surface of the support bar is not higher than the upper surface of the mounting portion; an air hole is further provided on the mounting portion near the outer side of the support bar, and the air hole is connected to the negative pressure mechanism through a pipeline.

[0008] Further, a plurality of convex strips are further provided on the top of the backing plate, the belt of the belt conveying mechanism is supported on the convex strips, and the length of each convex strip is less than the length of the backing plate.

[0009] Further, a photoelectric sensor is provided on one side of the mouth of each clearance opening, and the sensing head of the photoelectric sensor is arranged downward; a plurality of through holes are provided on the belt of the conveying mechanism, and the distance between adjacent through holes is equal to the distance between the two photoelectric sensors.

[0010] Further, the lifting mechanism includes two lifting cylinders and at least one set of adjusting mechanisms; the two lifting cylinders are oppositely arranged at the upper end of the mounting frame, and the telescopic ends of the two lifting cylinders are rotatably connected to the sealing cover; the adjusting mechanism includes a connecting plate, a first connecting rod, a second connecting rod and an adjusting nut; one end of the first connecting rod is pivotally connected to the connecting plate, and the other end is connected to the adjusting nut, one end of the second connecting rod is pivotally connected to the sealing cover, and the other end is connected to the adjusting nut; the whole formed by the first connecting rod, the second connecting rod and the adjusting nut forms a non-0° angle with the telescopic direction of the lifting cylinder.

[0011] Further, two support plates are further provided at the upper end of the mounting frame, and two sets of rollers supporting on the support plates are oppositely arranged at the bottom ends of the cylinder bodies of the lifting cylinders; an avoidance chute for avoiding the telescopic rod of the lifting cylinder and a guiding convex portion extending upward along both sides of the avoidance chute are provided on each support plate, and the guiding convex portion is located between the two sets of rollers; an elastic positioning pin is further provided at the upper end of the mounting frame, and a positioning hole cooperating with the elastic positioning pin is provided on one side of the cylinder body of the lifting cylinder.

[0012] Further, two fixing plates are oppositely arranged on the inner side of the sealing cover, and a plurality of elastic pressing strips are arranged in parallel between the two fixing plates, and the length direction of each elastic pressing strip is arranged along the conveying direction of the conveying mechanism.

[0013] Further, a protective cover is arranged around the mounting frame, and protective doors are arranged on the front and rear sides of the protective cover.

[0014] At least the following technical effects are achieved by one or more of the above technical solutions in the vacuum packaging equipment provided by the embodiments of the present invention:

[0015] 1. The packaging bags containing products are placed one by one on the conveying surface of the conveying mechanism. The conveying mechanism conveys the packaging bags to the bottom end of the sealing cover. The lifting mechanism drives the sealing cover to descend, so that a closed cavity is formed between the sealing cover and the upper surface of the conveying mechanism. The packaging bag is located in this closed cavity. The air in the closed cavity is pumped out by the negative pressure mechanism, and thus the air in the packaging bag can also be discharged, making the inside of the packaging bag in a vacuum state. Then, the heat-sealing assembly completes the sealing of the mouth of the packaging bag, so that the inside of the packaging bag can maintain a vacuum state. Therefore, automatic packaging, vacuuming and heat-sealing are realized, replacing the existing manual operation and improving the efficiency.

[0016] 2. Since the closed cavity is in a vacuum state during the heat-sealing process, the vacuum state in the packaging bag can be maintained during heat-sealing, improving the packaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a structural diagram of the vacuum packaging equipment provided by the embodiment of the present invention.

[0019] Figure 2 It is a front view of the other side of the vacuum packaging equipment provided by the embodiment of the present invention.

[0020] Figure 3 It is a structural diagram of the vacuum packaging equipment provided by the embodiment of the present invention with a backing plate.

[0021] Figure 4 It is a structural diagram of the backing plate part of the vacuum packaging equipment provided by the embodiment of the present invention.

[0022] Figure 5 It is a structural diagram of the part where the sealing cover is connected to the lifting mechanism of the vacuum packaging equipment provided by the embodiment of the present invention.

[0023] Figure 6 It is a structural diagram of the inner side of the sealing cover of the vacuum packaging equipment provided by the embodiment of the present invention.

[0024] Figure 7 It is a structural diagram of the lifting mechanism part of the vacuum packaging equipment provided by the embodiment of the present invention.

[0025] Figure 8 It is a structural diagram of the vacuum packaging equipment provided by the embodiment of the present invention with a protective cover. Detailed implementation manners

[0026] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0027] In the description of the embodiments of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0028] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the embodiments of the present invention, the meaning of "a plurality" is two or more unless otherwise specifically defined.

[0029] In the embodiments of the present invention, unless otherwise clearly defined and limited, the terms "mounted", "connected", "connected", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0030] In an embodiment of the present invention, with reference to Figure 1 and Figure 2, A vacuum packaging device, comprising a chassis 100, a conveying mechanism 200, a mounting frame 300, a lifting mechanism 400, a sealing cover 500, a heat-sealing assembly 600 and a negative pressure mechanism 700. The conveying mechanism 200 and the mounting frame 300 are arranged on the chassis 100. Two clearance openings 301 are provided at the bottom end of the mounting frame 300, so that the packaging bags on the conveying mechanism 200 can pass through the clearance openings 301. The lifting mechanism 400 is arranged at the upper end of the mounting frame 300, the sealing cover 500 is connected to the lifting mechanism 400, and the lifting mechanism 400 is used to drive the bottom of the sealing cover 500 to fit on the conveying surface of the conveying mechanism 200 and form a closed cavity. The negative pressure mechanism 700 is in pipeline communication with the closed cavity and is used to pump out the air in the closed cavity. The heat-sealing assembly 600 is connected in the closed cavity formed by the sealing cover 500 and is used to heat-seal the mouth of the packaging bag. In this embodiment, the packaging bags containing products are placed one by one on the conveying surface of the conveying mechanism 200. The conveying mechanism 200 conveys the packaging bags to the bottom end of the sealing cover 500. The lifting mechanism 400 drives the sealing cover 500 to descend, so that the sealing cover 500 and the upper surface of the conveying mechanism 200 form a closed cavity. The packaging bag is located in this closed cavity. The air in the closed cavity is pumped out through the negative pressure mechanism 700, and thus the air in the packaging bag can also be discharged, so that the inside of the packaging bag is in a vacuum state. Then, the heat-sealing assembly 600 completes the sealing of the mouth of the packaging bag, and thus the inside of the packaging bag can be kept in a vacuum state. Therefore, automatic packaging, vacuum pumping and heat-sealing are realized, replacing the existing manual operation, and the efficiency is improved. And because the closed cavity is in a vacuum state during the heat-sealing process, the vacuum state in the packaging bag can be maintained during heat-sealing, improving the packaging quality.

[0031] Further, in order to improve the airtightness when the sealing cover 500 covers the conveying surface of the conveying mechanism 200, a sealing rubber strip is also provided at the bottom of the sealing cover 500. By fitting the sealing rubber strip with the conveying surface of the conveying mechanism 200, the airtightness is further improved.

[0032] Still further, in order to prevent foreign objects or the body parts of operators from extending into the bottom of the sealing cover 500, grating sensors are provided on both sides of the clearance opening 301. When foreign objects are detected by the grating sensors, the lifting mechanism 400 can be controlled to stop driving downward, achieving the protection of the human body and the equipment.

[0033] Further, referring to Figures 1 to 3, the conveying mechanism 200 is a belt conveying mechanism. A backing plate 800 is further provided on the chassis 100. The backing plate 800 extends into the inner side of the belt of the belt conveying mechanism and is used to support the pressed sealing cover 500. In this embodiment, when the lifting mechanism 400 drives the sealing cover 500 to descend and the sealing cover 500 presses the belt, the belt is supported by the backing plate 800, so that a closed cavity is formed between the conveying surface of the conveying mechanism 200 and the sealing cover 500, preventing air leakage.

[0034] Further, referring to Figure 3 and Figure 4 , one end of the backing plate 800 extends out between the inner sides of the belt of the belt conveying mechanism to form a mounting portion 801. When the lifting mechanism 400 drives the sealing cover 500 to press down, a bottom edge of the sealing cover 500 is supported on the mounting portion 801. The heat sealing assembly 600 includes a heating strip 610, a support strip 620, and a lifting mechanism 630. The heating strip 610 is fixedly installed on the inner side of the sealing cover 500. Specifically, a heat insulation mounting plate 611 is provided on the top of the heating strip 610, and the heating strip 610 is fixedly installed in the sealing cover 500 through the heat insulation mounting plate 611. The lifting mechanism 630 is disposed at the bottom end of the mounting portion 801. The mounting portion 801 is provided with an avoidance groove 802 for avoiding the lifting end of the lifting mechanism 630. The support strip 620 is disposed at the lifting end of the lifting mechanism 630. The support strip 620 is used to support the bag mouth of the packaging bag. The lifting mechanism 620 lifts the support strip 620, so that the support strip 620 and the heating strip 610 clamp and heat-press the packaging bag, thereby achieving the function of heat sealing. More specifically, when the packaging bag is conveyed by the conveying mechanism 200 to the bottom end of the sealing cover 500, the bag mouth of the packaging bag is supported on the support strip 620. After the vacuum is pumped out, the lifting mechanism 630 is used to push the support strip 620 to rise, so that the support strip 620 can press the bag mouth of the packaging bag against the bottom of the heating strip 610. Since the heating strip 610 is disposed at the top, the packaging bag can be prevented from contacting the heating strip 610 during the conveying process and the vacuum pumping process, playing a protective role for the packaging bag.

[0035] Furthermore, the heating strip 610 has a hollow structure inside and is connected to the circulating water cooling system pipeline. Therefore, the heating strip 610 is cooled by water to maintain a constant temperature, avoiding damage caused by excessive temperature of the heating strip 610, and also avoiding the packaging bag being burned out during packaging due to excessive temperature of the heating strip 610, playing a protective role for the packaging bag.

[0036] Furthermore, referring to Figure 4 , the lifting mechanism 630 includes a plurality of cylinders arranged side by side at the bottom of the mounting portion 801.

[0037] Further, referring toFigure 3 and Figure 4 When the lifting mechanism 630 pulls down the support bar 620 and sinks it into the clearance groove 802, the upper surface of the support bar 620 is not higher than the upper surface of the mounting portion 801. Therefore, during the conveying process of the packaging bag, the support bar 620 effectively avoids blocking the packaging bag, making the conveying of the packaging bag smooth. An air hole 803 is further provided on the mounting portion 801 near the outer side of the support bar 620, and the air hole 803 is connected to the negative pressure mechanism 700 through a pipeline. In this embodiment, the air hole 803 is provided on the front side of the support bar 620. Therefore, when the packaging bag is conveyed to the packaging position, the mouth of the packaging bag is located on one side of the air hole 803 and faces the air hole 803. Therefore, when evacuating, the air in the packaging bag can be better discharged.

[0038] Furthermore, referring to Figure 4 , a plurality of convex strips 804 are further provided on the top of the backing plate 800, and the belt of the belt conveying mechanism 200 is supported on the convex strips 804. The length of each convex strip 804 is less than the length of the backing plate 800. In this embodiment, when the sealing cover 500 is pressed down to form a closed cavity with the belt and the mounting portion, the belt will sink downward along both ends of the convex strip 804. When the sealing cover 500 rises, the convex strip 804 enables the belt to rebound, so that there is a gap between the belt and the backing plate 800, avoiding the flat stacking of the belt and the backing plate 800. When evacuating, a negative pressure is formed between the belt and the backing plate 800, resulting in the conveying mechanism 200 being fixed by the adsorption force of the negative pressure and unable to operate. And the contact area of the belt can be reduced by the convex strip 804, making the belt run with less wear and more smoothly.

[0039] Even further, referring to Figure 3 and Figure 4 , the upper surface of the mounting portion 801 protrudes upward. Therefore, when the belt is supported on the backing plate 800, the conveying surface of the conveying mechanism 200 can be flush with the upper surface of the mounting portion 801. Therefore, when the sealing cover 500 is pressed down to fit the conveying surface, the airtightness can be further improved.

[0040] Furthermore, referring to Figure 2On one side of the mouth of each clearance opening 301, a photoelectric sensor 900 is provided, and the sensing head of the photoelectric sensor 900 is arranged downward. A plurality of through holes 201 are provided on the belt of the conveying mechanism 200, and the distance between adjacent through holes 201 is equal to the distance between the two photoelectric sensors 900. In this embodiment, when the packaging bag is on the conveying mechanism, when the photoelectric sensor 900 at the front end of the conveying detects the through hole on the belt, it is used as the starting point of the conveying. The conveying mechanism 200 conveys the packaging bag to the bottom end of the sealing cover 500. When the next photoelectric sensor 900 detects the through hole 201, the conveying mechanism 200 stops conveying. Therefore, one cycle of conveying is completed, and by circulating in this way, it can realize automatic and equidistant cyclic conveying, and the accuracy of packaging conveying and conveying positioning.

[0041] Furthermore, referring to Figures 5 to 7 , the lifting mechanism 400 includes two lifting cylinders 410 and at least one set of adjusting mechanisms 420. The two lifting cylinders 410 are oppositely arranged at the upper end of the mounting frame 300, and the telescopic ends of the two lifting cylinders 410 are rotatably connected to the sealing cover 500. The adjusting mechanism 420 includes a connecting plate 421, a first connecting rod 422, a second connecting rod 423 and an adjusting nut 424. One end of the first connecting rod 422 is pivotally connected to the connecting plate 421, and the other end is connected to the adjusting nut 424. One end of the second connecting rod 423 is pivotally connected to the sealing cover 500, and the other end is connected to the adjusting nut 424. The whole formed by the first connecting rod 422, the second connecting rod 423 and the adjusting nut 424 forms a non-0° angle with the telescopic direction of the lifting cylinder 410. In this embodiment, by rotating the adjusting nut 424, the length of the whole formed by the first connecting rod 422, the second connecting rod 423 and the adjusting nut 424 can be adjusted, and then the angle of the whole formed by the first connecting rod 422, the second connecting rod 423 and the adjusting nut 424 can be adjusted, so as to adjust the angle of the sealing cover 500, so that the sealing cover 500 can be smoothly attached to the conveying surface of the transmission mechanism 200.

[0042] Furthermore, referring to Figure 5 and Figure 7, two support plates 301 are further provided at the upper end of the mounting frame 300, and two sets of rollers 411 are oppositely provided at the bottom end of the cylinder body of each lifting cylinder 410 and supported on the support plates 301. Each support plate 301 is provided with a clearance chute 302 for avoiding the telescopic rod of the lifting cylinder 410, and a guiding convex portion 303 extending upward along both sides of the clearance chute 302. The guiding convex portion 303 is located between the two sets of rollers 411. An elastic positioning pin 304 is further provided at the upper end of the mounting frame 300, and a positioning hole for cooperating with the elastic positioning pin 304 is provided on one side of the cylinder body of the lifting cylinder 410. In this embodiment, when it is necessary to replace the parts inside the seal cover 500, such as the heat-sealing assembly 600, etc., the elastic positioning pin 304 can be pulled out from the positioning hole, so that the lifting cylinder 410 can be pushed to roll on the support plate 301, so as to push the seal cover 500 out of the mounting frame 300, facilitating the staff to replace the parts inside the seal cover 500 and facilitating maintenance.

[0043] Furthermore, the two lifting cylinders 410 are connected by a connecting plate.

[0044] Furthermore, referring to Figure 6 , two fixing plates 501 are oppositely provided on the inner side of the seal cover 500, and a plurality of elastic pressing strips 502 are arranged in parallel between the two fixing plates 501. The length direction of each elastic pressing strip 502 is arranged along the conveying direction of the conveying mechanism 200. In this embodiment, when the seal cover 500 is pressed down, the elastic pressing strips 502 are pressed tightly on the packaging bag, so as to limit the packaging bag, prevent the packaging bag from being misaligned, and prevent the products in the packaging bag from being damaged, and can better discharge the air in the packaging bag.

[0045] Furthermore, referring to Figure 7 , a protective cover 310 is provided on the periphery of the mounting frame 300, and protective doors 311 are provided on the front and rear sides of the protective cover 310.

[0046] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A vacuum packaging device, characterized in that, It includes a chassis, a conveying mechanism, a mounting frame, a lifting mechanism, a sealing cover, a heat-sealing assembly and a negative-pressure mechanism; the conveying mechanism and the mounting frame are arranged on the chassis; two clearance openings are provided at the bottom end of the mounting frame to allow the packaging bags on the conveying mechanism to pass through the clearance openings; the lifting mechanism is arranged at the upper end of the mounting frame, the sealing cover is connected to the lifting mechanism, and the lifting mechanism is used to drive the bottom of the sealing cover to fit on the conveying surface of the conveying mechanism and form a closed cavity, and the negative-pressure mechanism is connected to the closed cavity through a pipeline to extract the air in the closed cavity; the heat-sealing assembly is connected in the closed cavity formed by the sealing cover and is used to heat-seal the bag mouth of the packaging bag; the lifting mechanism includes two lifting cylinders and at least one set of adjusting mechanisms; the two lifting cylinders are oppositely arranged at the upper end of the mounting frame, and the telescopic ends of the two lifting cylinders are rotatably connected to the sealing cover; the adjusting mechanism includes a connecting plate, a first connecting rod, a second connecting rod and an adjusting nut; one end of the first connecting rod is pivotally connected to the connecting plate, and the other end is connected to the adjusting nut, one end of the second connecting rod is pivotally connected to the sealing cover, and the other end is connected to the adjusting nut; the whole formed by the first connecting rod, the second connecting rod and the adjusting nut forms a non-0° angle with the telescopic direction of the lifting cylinder; two fixing plates are relatively arranged on the inner side of the sealing cover, and multiple elastic pressing strips are arranged in parallel between the two fixing plates, and the length direction of each elastic pressing strip is arranged along the conveying direction of the conveying mechanism; a protective cover is arranged on the periphery of the mounting frame, and protective doors are arranged on the front and rear sides of the protective cover.

2. The vacuum packaging equipment according to claim 1, wherein: The conveying mechanism is a belt conveying mechanism, and a backing plate is further arranged on the chassis, and the backing plate extends into the inner side of the belt of the belt conveying mechanism and is used to support the pressing sealing cover.

3. The vacuum packaging equipment according to claim 2, characterized in that: One end of the backing plate extends out from between the inner sides of the belt of the belt conveying mechanism to form a mounting part; one bottom edge of the pressing sealing cover is supported on the mounting part; the heat-sealing assembly includes a heating strip, a support strip and a lifting mechanism; the heating strip is fixedly installed on the inner side of the sealing cover, the lifting mechanism is arranged at the bottom end of the mounting part, and the mounting part is provided with a clearance groove for clearing the lifting end of the lifting mechanism, and the support strip is arranged at the lifting end of the lifting mechanism; the support strip is used to support the bag mouth of the packaging bag, the lifting mechanism lifts the support strip, and the support strip and the heating strip clamp and hot-press the packaging bag.

4. The vacuum packaging equipment according to claim 3, characterized in that: When the lifting mechanism pulls down the support strip and sinks it into the clearance groove, the upper surface of the support strip is not higher than the upper surface of the mounting part; air holes are further arranged on the mounting part near the outer side of the support strip, and the air holes are connected to the negative-pressure mechanism through a pipeline.

5. The vacuum packaging equipment according to any one of claims 2 to 4, characterized in that: Multiple convex strips are further arranged on the top of the backing plate, and the belt of the belt conveying mechanism is supported on the convex strips, and the length of each convex strip is less than the length of the backing plate.

6. The vacuum packaging equipment according to any one of claims 2 to 4, characterized in that: One side of the mouth of each clearance opening is provided with a photoelectric sensor, and the sensing head of the photoelectric sensor is arranged downward; a plurality of through holes are arranged on the belt of the conveying mechanism, and the distance between adjacent through holes is equal to the distance between the two photoelectric sensors.

7. The vacuum packaging equipment according to claim 1, wherein: Two support plates are further arranged at the upper end of the mounting frame, and two groups of rollers supported on the support plates are relatively arranged at the bottom ends of the cylinder bodies of the lifting cylinders; an avoidance sliding groove for avoiding the telescopic rod of the lifting cylinder and a guiding convex part extending upward along both sides of the avoidance sliding groove are arranged on each support plate, and the guiding convex part is located between the two groups of rollers; an elastic positioning pin is further arranged at the upper end of the mounting frame, and a positioning hole matched with the elastic positioning pin is arranged on one side of the cylinder body of the lifting cylinder.

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