A positioning and pushing mechanism for a packaging machine and its usage method

Abstract

The present invention discloses a positioning and pushing mechanism for a packaging machine and a usage method, including: a turntable, a plurality of support components installed at the bottom of the turntable, and a pushing component located on one side of the turntable. The pushing component includes: a support plate, brazing tubes symmetrically arranged on the support plate, a connecting tube fixedly connected to the end of the brazing tube, and a driving part for driving the two brazing tubes to move relative to each other. In the present invention, the pushing component pushes the tray that falls between the two brazing tubes into the opened packaging bag, and through the ventilation pipe and an external negative pressure device, the air in the packaging bag is used to fix the position of the tray in the packaging bag, thereby ensuring that the food is always located in the middle of the packaging bag. Subsequently, the packaging bags can be neatly stacked. At the same time, by automatically pushing the food material into the packaging bag, it is avoided that the food in the tray scatters outside the tray after entering the packaging bag.

Description

Technical Field

[0001] The present invention relates to the technical field of feeding of packaging machines, and particularly relates to a positioning and pushing mechanism for a packaging machine and a using method thereof. Background Art

[0002] During food production, it is necessary to use a packaging machine to package food. Currently, most of the packaging machines for food packaging are bag - feeding packaging machines, which all adopt a vertical bag - loading structure, that is, when loading the bag, the packaging bag is placed vertically, and the bag mouth is opened and the material is loaded from the top direction.

[0003] Some foods need to be placed on a tray, and the tray and the food are placed together in the packaging bag for vacuum packaging. When using the vertical method for bag - loading, it is difficult for the food to be located in the middle of the packaging bag. When stacking the packaging bags later, the stacked packaging bags are difficult to be neat and are prone to tipping; and when the tray is poured into the packaging bag, the food in the tray will inevitably fall outside. Therefore, the existing bag - feeding packaging machines are not suitable for packaging the above - mentioned products and can only be bag - loaded manually, resulting in low efficiency and high labor intensity.

[0004] Therefore, it is necessary to improve the packaging machine in the prior art to solve the above problems. Summary of the Invention

[0005] The present invention overcomes the deficiencies of the prior art and provides a positioning and pushing mechanism for a packaging machine and a using method thereof.

[0006] To achieve the above object, the technical solution adopted by the present invention is: a positioning and pushing mechanism for a packaging machine, including: a turntable, a plurality of support components installed at the bottom of the turntable, and a pushing component located on one side of the turntable.

[0007] The pushing component includes: a support plate, symmetrically arranged brazing pipes on the support plate, a connecting pipe fixedly connected to the end of the brazing pipe, and a driving part for driving the two brazing pipes to move relative to each other; the brazing pipe is communicated with the connecting pipe, a ventilation pipe is communicated with the connecting pipe, and the ventilation pipe is communicated with an external negative pressure device; an air suction port communicated with the hollow position inside the brazing pipe is opened at the end of the brazing pipe; a driving member for driving the brazing pipe to move towards the support component is arranged on one side of the driving part.

[0008] The support component includes: a slide rail fixed to the bottom of the turntable, support rods symmetrically installed at both ends of the slide rail, a static clamping plate fixed to the support rod, and a movable clamping plate rotatable with the support rod; when the support rod of each support component rotates to be parallel to the corresponding brazing pipe, the brazing pipe is located between adjacent support rods.

[0009] A driving component for driving the support rods to move relative to each other is arranged at the bottom of the turntable.

[0010] In a preferred embodiment of the present invention, the brazing tubes in each of the pushing components are arranged in parallel.

[0011] In a preferred embodiment of the present invention, the driving part includes: a connecting rod rotatably connected to the end of the connecting pipe, a rotating rod rotatably connected to two adjacent connecting rods, and a first telescopic rod for driving the connecting rod to move; the first telescopic rod is fixedly installed on the support plate, a fixing rod is fixed to the output end of the first telescopic rod, and the fixing rod is rotatably connected to the connecting rod at the position of the connecting pipe;

[0012] A long groove is formed on the support plate, and the connecting pipe slides in the long groove.

[0013] In a preferred embodiment of the present invention, the driving component includes: a fixing shaft fixed to the turntable, and hinge rods symmetrically hinged to the fixing shaft; the support rod is located above the hinge rod and is in contact with the hinge rod, sliding grooves are formed on both the upper and lower sides of the hinge rod, a slider is fixed to the end of the support rod in contact with the hinge rod, and the slider is slidably limited in the sliding groove.

[0014] In a preferred embodiment of the present invention, the driving component further includes: a push rod located below the hinge rod, push blocks fixed to both ends of the push rod, and a second telescopic rod for driving the push rod to move; the push blocks are located in the sliding grooves below the hinge rod and are slidably limited.

[0015] In a preferred embodiment of the present invention, the output end of the second telescopic rod is hinged to the bottom of the push rod, and the second telescopic rod is hinged to the disc.

[0016] In a preferred embodiment of the present invention, the lengths of the static clamping plate and the moving clamping plate are less than the length of the packaging bag.

[0017] In a preferred embodiment of the present invention, the sealing component in the packaging machine is located above and below the support rod between the static clamping plate and the brazing tube.

[0018] The present invention provides a method for using a positioning and pushing mechanism for a packaging machine, including the following steps:

[0019] S1. The support component clamps both sides of the packaging bag, and the support rod in the driving component presses the support component inward, so that the open position of the packaging bag opens;

[0020] S2. The turntable drives the opened packaging bag to rotate to the corresponding position of the pushing component, so that the support rod rotates to a position parallel to the corresponding brazing tube. The brazing tube relatively moves through the driving part to clamp the product, and the product is sent into the packaging bag through the driving part;

[0021] S3. The driving component drives the support rod to move outward, the packaging bag is tightened and attached to the upper and lower surfaces of the product, and the open position of the packaging bag is attached;

[0022] S4. Through the negative pressure device, the suction port at the front end of the brazing tube evacuates the inside of the packaging bag, causing the upper and lower surfaces of the packaging bag to deform and further attach to the side surface of the product;

[0023] S5. Through the driving part, the brazing tube is withdrawn from the packaging bag, and the open position of the packaging bag is sealed by the sealing component on the packaging machine.

[0024] In a preferred embodiment of the present invention, when the support component rotates to the position corresponding to the pushing component and stops, the axis of the support component coincides with the axis of the pushing component.

[0025] The present invention solves the defects in the background art and has the following beneficial effects:

[0026] (1) The present invention provides a positioning and pushing mechanism for a packaging machine. This mechanism uses the cooperation of a turntable, a support component and a pushing component to push the product to the middle position of the packaging bag and fix it by negative pressure, ensuring that the food is always located in the middle of the packaging bag, avoiding the position deviation of the product inside the packaging bag, enabling it to be neatly stacked and improving the aesthetics.

[0027] (2) When the support component rotates to the position corresponding to the pushing component and stops in the present invention, the axis of the support component coincides with the axis of the pushing component. The brazing tubes in the pushing component are arranged in parallel, and the brazing tubes move relatively and clamp the product, enabling the product to be accurately pushed into the middle position of the packaging bag, avoiding the position deviation caused by the impact of the product on the packaging bag during vertical packaging, and improving the positioning and pushing accuracy of the packaging machine.

[0028] (3) At the bottom of the turntable of the present invention, there is a driving component for driving the support rod to move relatively. The end of the brazing tube is provided with a suction port communicating with its internal hollow position, and the suction port is connected to a negative pressure device; the driving component tightens the packaging bag and makes the packaging bag attach to the upper and lower surfaces of the product, and the open position of the packaging bag is attached, playing a role in initially fixing the product; using the negative pressure effect, the upper and lower surfaces of the packaging bag deform and further attach to the side surface of the product, playing a role in re-fixing the product; the two fixing processes ensure that the product is fixed in the middle position of the packaging bag and improve the positioning effect of the packaging machine. Description of the Drawings

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings;

[0030] Figure 1 is a front view structural schematic diagram of a preferred embodiment of the present invention;

[0031] Figure 2 is an overall structural schematic diagram of a preferred embodiment of the present invention;

[0032] Figure 3 is a structural schematic diagram of a pushing component of a preferred embodiment of the present invention;

[0033] Figure 4 is a structural cooperation schematic diagram of a driving component and a supporting component of a preferred embodiment of the present invention;

[0034] Figure 5 is a Figure 4 bottom view structural schematic diagram of a preferred embodiment of the present invention.

[0035] In the figure: 1, turntable; 2, support plate; 3, drill pipe; 4, connecting pipe; 5, ventilation pipe; 6, connecting rod; 7, rotating rod; 8, first telescopic rod; 9, fixed rod; 10, slide rail; 11, support rod; 12, static clamping plate; 13, moving clamping plate; 14, fixed shaft; 15, hinged rod; 16, chute; 17, slider; 18, push rod; 19, push block; 20, second telescopic rod. Detailed implementation manners

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0037] Many specific details are set forth in the following description in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited by the specific embodiments disclosed below.

[0038] In the description of the present application, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "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. It is only for the convenience of describing the present application 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 protection scope of the present application. In addition, terms such as "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Therefore, the features defined with "first", "second", etc. may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, the meaning of "a plurality" is two or more.

[0039] In the description of the present application, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood through specific situations.

[0040] As Figure 1 , Figure 2 and Figure 3 shown, a positioning and pushing mechanism for a packaging machine includes: a turntable 1, a plurality of support components installed at the bottom of the turntable 1, and a pushing component located on one side of the turntable 1.

[0041] The pushing component includes: a support plate 2, brazing tubes 3 symmetrically arranged on the support plate 2, a connecting tube 4 fixedly connected to the end of the brazing tube 3, and a driving part for driving the two brazing tubes 3 to move relative to each other; a long groove is provided on the support plate 2, the connecting tube 4 slides in the long groove, and the brazing tube 3 is communicated with the connecting tube 4. An air vent pipe 5 is communicated with the connecting tube 4, and the air vent pipe 5 is communicated with an external negative pressure device.

[0042] The driving part includes: a connecting rod 6 rotatably connected to the end of the connecting tube 4, a rotating rod 7 rotatably connected to two adjacent connecting rods 6, and a first telescopic rod 8 for driving the connecting rod 6 to move; the first telescopic rod 8 is fixedly installed on the support plate 2, a fixing rod 9 is fixed to the output end of the first telescopic rod 8, and the fixing rod 9 is rotatably connected to the connecting rod 6 at the position of the connecting tube 4. An air suction port is provided at the end of the brazing tube 3 and is communicated with the hollow position inside it. A driving member for driving the brazing tube 3 to move towards the support rod 11 is provided on one side of the driving part.

[0043] The supporting assembly includes: a slide rail 10 fixed to the bottom of the turntable 1, support rods 11 symmetrically installed at both ends of the slide rail 10, a static clamping plate 12 fixed to the support rods 11, and a movable clamping plate 13 rotatably connected to the support rods 11; when the support rods 11 of each supporting assembly rotate to be parallel to the corresponding drill pipe 3, the drill pipe 3 is located between adjacent support rods 11.

[0044] A driving assembly for driving the relative movement of the support rods 11 is provided at the bottom of the turntable 1.

[0045] It should be noted that the drill pipe 3 is located directly below the feeding device of the packaging machine.

[0046] In order to make the tray located in the middle of the packaging bag after entering the packaging bag, the drill pipe 3 and a driving part for driving the relative movement of the two drill pipes 3 are provided.

[0047] When the tray needs to be pushed into the packaging bag, the tray will first fall between the two drill pipes 3 from the feeding device of the packaging machine. By driving the first telescopic rod 8, since the end of the first telescopic rod 8 is connected to the connecting rod 6 at the position of the connecting pipe 4 and is connected by the fixing rod 9, when the first telescopic rod 8 moves, it will drive the connected connecting pipe 4 to move in the long groove. Since the adjacent ends of the two connecting rods 6 are rotatably connected to the rotating rod 7, the other connecting pipe 4 will be driven to move towards each other, so as to clamp and fix the tray, so that it can be located in the middle of the packaging bag after entering the packaging bag.

[0048] In order to fix the position of the tray in the packaging bag, when the tray is in the middle of the packaging bag, it is hollowed out.

[0049] After the driving member drives the pushing assembly to push the tray into the packaging bag, the driving member will drive the pushing assembly to be withdrawn from the packaging bag again. During this process, by starting the negative pressure device, the suction port at the front end of the drill pipe 3 will suck air from the packaging bag, perform vacuum treatment on the packaging bag, and fix the position of the tray. Until the sealing assembly on the packaging machine seals the open position of the packaging bag, the drill pipe 3 will be completely withdrawn from the packaging bag.

[0050] As Figure 4 and Figure 5 shown, in a preferred embodiment of the present invention, a driving assembly for driving the relative movement of the support rods 11 is provided at the bottom of the turntable 1. The driving assembly includes: a fixed shaft 14 fixed to the turntable 1, and hinge rods 15 symmetrically hinged on the fixed shaft 14; the support rods 11 are located above the hinge rods 15 and are in contact with the hinge rods 15. Sliding grooves 16 are provided on both the upper and lower sides of the hinge rods 15. A slider 17 is fixed to the end of the support rod 11 in contact with the hinge rod 15, and the slider 17 is slidably limited in the sliding groove 16.

[0051] In a preferred embodiment of the present invention, the driving assembly further includes: a push rod 18 located below the hinge rod 15, push blocks 19 fixed at both ends of the push rod 18, and a second telescopic rod 20 for driving the movement of the push rod 18; the push blocks 19 are located in the chute 16 below the hinge rod 15 and are limited to slide.

[0052] In a preferred embodiment of the present invention, the output end of the second telescopic rod 20 is hinged to the bottom of the push rod 18, and the second telescopic rod 20 is hinged to the disc.

[0053] It should be noted that the first telescopic rod 8, the second telescopic rod 20 and the driving member are preferably electric telescopic rods;

[0054] In the initial state, the moving clamping plate 13 and the static clamping plate 12 are not closed. The manipulator on the packaging machine will place the packaging bag at the position of the static clamping plate 12, and the moving clamping plate 13 will clamp the packaging bag;

[0055] After the moving clamping plate 13 clamps the packaging bag, the driving assembly will drive the two support rods 11 to approach each other, opening the opening of the packaging bag clamped by the moving clamping plate 13, so as to facilitate placing the tray into the packaging bag;

[0056] That is, after the tray is placed in the packaging bag, the driving assembly drives the two support rods 11 to move away from each other, thereby pulling the packaging bag, making the opening positions of the packaging bag fit together, and through the mutual extrusion force after the packaging bag is pulled, the position of the tray in the packaging bag is squeezed and fixed, which is convenient for shaping the position of the tray during subsequent vacuum treatment of the packaging bag.

[0057] In a preferred embodiment of the present invention, the lengths of the static clamping plate 12 and the moving clamping plate 13 are less than the length of the packaging bag.

[0058] In a preferred embodiment of the present invention, the sealing assembly in the packaging machine is located above and below the support rod 11 between the static clamping plate 12 and the brazing tube 3.

[0059] It should be noted that in order to allow the opening position of the packaging bag to be sealed by the sealing assembly on the packaging machine, the lengths of the static clamping plate 12 and the moving clamping plate 13 need to be less than the length of the packaging bag, so that the open position of the packaging bag can be exposed;

[0060] Moreover, after the vacuum treatment of the packaging bag, the position of the tray is also fixed, and the packaging bag is directly sealed, so as to ensure that the tray is always located in the middle of the packaging bag.

[0061] The present invention provides a method for using a positioning and pushing mechanism for a packaging machine, including the following steps:

[0062] S1. The supporting assembly clamps both sides of the packaging bag, and the supporting rod 11 in the supporting assembly is inwardly pressed by the driving assembly, so that the open position of the packaging bag opens.

[0063] S2. The turntable 1 drives the opened packaging bag to rotate to the corresponding position of the pushing assembly, so that the supporting rod 11 rotates to a position parallel to the corresponding brazing tube 3. The brazing tube 3 is driven by the driving part to move closer to each other, clamp the tray at the middle position of the brazing tube 3, and send the tray into the packaging bag through the driving part.

[0064] S3. The driving assembly drives the supporting rod 11 to move outward, pulls the packaging bag, so that the upper and lower surfaces of the tray are both attached to the packaging bag, and the open position of the packaging bag is attached.

[0065] S4. Through the negative pressure device, the suction port at the front end of the brazing tube 3 vacuums the inside of the packaging bag, so that the upper and lower surfaces of the packaging bag are deformed and further attached to the tray.

[0066] S5. Through the driving part, the brazing tube 3 is drawn out of the packaging bag, and the open position of the packaging bag is sealed by the sealing assembly on the packaging machine.

[0067] In a preferred embodiment of the present invention, when the supporting assembly rotates to the corresponding position of the pushing assembly and stops, the axis of the supporting assembly coincides with the axis of the pushing assembly.

[0068] It should be noted that the axis of the supporting assembly is the axis between the two supporting rods 11, and the axis of the pushing assembly is the axis between the two brazing tubes 3.

[0069] When the present invention is in use, the moving clamping plate 13 and the static clamping plate 12 are not closed. The manipulator on the packaging machine will place the packaging bag at the position of the static clamping plate 12, and the moving clamping plate 13 will clamp the packaging bag, and drive the push rod 18 hinged thereto to move through the second telescopic rod 20. Since the push blocks 19 at both ends of the push rod 18 are located in the sliding grooves 16 at the lower position of the hinge rod 15, the movement of the push rod 18 will drive the two symmetrically hinged hinge rods 15 to rotate and approach each other. Also, since the slider 17 on the supporting rod 11 is located in the sliding groove 16 on the upper surface of the hinge rod 15, when the hinge rod 15 rotates relatively, the two symmetrically arranged supporting rods 11 will approach each other, open the open position of the packaging bag, and rotate to the relative position of the pushing assembly through the turntable 1.

[0070] Subsequently, the tray first falls between the two brazing tubes 3 from the feeding device of the packaging machine. By driving the first telescopic rod 8, since the end of the first telescopic rod 8 is located at the connecting rod 6 at the position of the connecting pipe 4 and is connected by the fixing rod 9, when the first telescopic rod 8 moves, it will drive the connected connecting pipe 4 to move in the long groove. Since the adjacent ends of the two connecting rods 6 rotate with the rotating rod 7, it will drive the other connecting pipe 4 to move in the opposite direction, so that the tray can be clamped and fixed, and when it enters the packaging bag, it can be located in the middle of the packaging bag;

[0071] Then, by driving the driving assembly to drive the two support rods 11 to move away from each other, the packaging bag is pulled, so that the opening positions of the packaging bag are mutually attached. By starting the negative pressure device, the suction port at the front end of the brazing tube 3 will suck the packaging bag, so that after the packaging bag is vacuum-treated;

[0072] Finally, by driving the driving member again, the pushing assembly is driven to be withdrawn from the packaging bag, and the brazing tube 3 is withdrawn from the packaging bag. Until the sealing assembly on the packaging machine seals the open position of the packaging bag, the brazing tube 3 will be completely withdrawn from the packaging bag, and by rotating the turntable 1, the processed packaging bag is rotated to the blanking position.

[0073] Based on the ideal embodiments of the present invention as inspiration, through the above description, relevant personnel can completely make various changes and modifications without departing from the technical idea of this invention. The technical scope of this invention is not limited to the content in the specification, and the technical scope must be determined according to the scope of the claims.

Claims

1. A positioning and pushing mechanism for a packaging machine, comprising: A turntable, a plurality of support components installed at the bottom of the turntable, and a pushing component located on one side of the turntable, characterized in that: The pushing component includes: a support plate, brazing pipes symmetrically arranged on the support plate, a connecting pipe fixedly connected to the end of the brazing pipe, and a driving part for driving the two brazing pipes to move relative to each other; the brazing pipes are communicated with the connecting pipe, and a ventilation pipe is communicated with the connecting pipe, and the ventilation pipe is communicated with an external negative pressure device; the end of the brazing pipe is provided with a suction port communicated with its internal hollow position; the brazing pipe is located directly below the feeding device of the packaging machine. When the tray for placing food needs to be pushed into the packaging bag, the tray will first fall from the feeding device of the packaging machine between the two brazing pipes, and the tray will be clamped and fixed to make it enter the middle position of the packaging bag; One side of the driving part is provided with a driving member for driving the brazing pipe to move towards the support component; The support component includes: a slide rail fixed to the bottom of the turntable, support rods symmetrically installed at both ends of the slide rail, a static clamping plate fixed to the support rod, and a moving clamping plate rotatable with the support rod; when the support rod of each support component rotates to be parallel to the corresponding brazing pipe, the brazing pipe is located between adjacent support rods; A driving component for driving the support rods to move relative to each other is provided at the bottom of the turntable.

2. The positioning and pushing mechanism for a packaging machine according to claim 1, characterized in that: The brazing pipes in each pushing component are arranged in parallel.

3. The positioning and pushing mechanism for a packaging machine according to claim 1, wherein: The driving part includes: a connecting rod rotatably connected to the end of the connecting pipe, a rotating rod rotatably connected to two adjacent connecting rods, and a first telescopic rod for driving the connecting rod to move; the first telescopic rod is fixedly installed on the support plate, and a fixed rod is fixed to the output end of the first telescopic rod, and the fixed rod is rotatably connected to the connecting rod at the position of the connecting pipe; A long groove is provided on the support plate, and the connecting pipe slides in the long groove.

4. A positioning and pushing mechanism for a packaging machine according to claim 1, characterized in that: The driving component includes: a fixed shaft fixed to the turntable, and hinge rods symmetrically hinged to the fixed shaft; the support rod is located above the hinge rod and fits with the hinge rod. Sliding grooves are provided on both the upper and lower sides of the hinge rod. A slider is fixed to the end of the support rod that fits with the hinge rod, and the slider is slidably limited in the sliding groove.

5. The positioning and pushing mechanism for a packaging machine according to claim 4, wherein: The driving component further includes: a push rod located below the hinge rod, push blocks fixed to both ends of the push rod, and a second telescopic rod for driving the push rod to move; the push blocks are located in the sliding grooves below the hinge rod and are slidably limited.

6. The positioning and pushing mechanism for a packaging machine according to claim 5, wherein: The output end of the second telescopic rod is hinged to the bottom of the push rod, and the second telescopic rod is hinged to the disc.

7. A positioning and pushing mechanism for a packaging machine according to claim 1, characterized in that: The lengths of the static clamping plate and the moving clamping plate are less than the length of the packaging bag.

8. A positioning and pushing mechanism for a packaging machine according to claim 1, characterized in that: The sealing component in the packaging machine is located above and below the support rod between the static clamping plate and the brazing pipe.

9. The usage method of the positioning and pushing mechanism for a packaging machine according to any one of claims 1-8, characterized in that, Including the following steps: S1. The support component clamps both sides of the packaging bag, and the support rod in the support component is pushed inward by the driving component to open the open position of the packaging bag; S2. The turntable drives the opened packaging bag to rotate to the corresponding position of the pushing component, so that the support rod rotates to a position parallel to the corresponding brazing pipe. The brazing pipe relatively moves through the driving part to clamp the product, and the product is sent into the packaging bag through the driving member; S3. The driving component drives the support rod to move outward, the packaging bag is tightened and fits on the upper and lower surfaces of the product, and the open position of the packaging bag fits; S4. Through the negative pressure device, the suction port at the front end of the brazing tube vacuums the inside of the packaging bag, causing the upper and lower surfaces of the packaging bag to deform and further fit on the side surface of the product; S5. Through the driving part, the brazing tube is withdrawn from the packaging bag, and the open position of the packaging bag is sealed by the sealing component on the packaging machine.

10. The usage method of a positioning and pushing mechanism for a packaging machine according to claim 9, characterized in that: In the step S2, when the support component rotates to the position corresponding to the pushing component and stops, the axis of the support component coincides with the axis of the pushing component.

Images