Packaging bag coding machine and coding method

Abstract

The present invention relates to the technical field of packaging devices, and specifically discloses a packaging bag coding machine and a coding method, comprising: a first conveyor belt, a coding mechanism, a first positioning component and a second positioning component, the coding mechanism can spray codes on packaging bags, the first positioning component comprises a first lifting mechanism, a first horizontal moving mechanism and a first positioning plate, the horizontal moving mechanism is arranged on the lifting mechanism, the positioning plate is arranged on the horizontal moving mechanism, the second positioning component has the same structure as the first positioning component, and comprises a second lifting mechanism, a second horizontal moving mechanism and a second positioning plate, the first positioning component and the second positioning component are symmetrically distributed on both sides of the first conveyor belt; the packaging bag coding machine of the present invention can be applied to coding packaging bags of soft packaging, vacuum packaging and modified atmosphere packaging, and has high versatility.

Description

Technical Field

[0001] The invention relates to the technical field of packaging devices, and in particular to a packaging bag coding machine and a coding method. Background Art

[0002] In the modern food processing industry, processed food usually needs to be placed in a packaging bag using a packaging device to ensure the safety, freshness and hygiene of the food during storage, transportation and sales. The packaging methods in the prior art include: flexible packaging, vacuum packaging and modified atmosphere packaging, wherein flexible packaging refers to packaging bags made of paper, plastic materials or composite products of the two, such as paper, plastic and aluminum foil composite products, polypropylene film-aluminum foil-polyester composite products, etc. This packaging method is light, easy to carry, and relatively low in cost; vacuum packaging refers to extracting the air in the packaging bag through a vacuum device to reduce the oxygen content, which has the advantage of delaying the oxidation and deterioration of food; modified atmosphere packaging refers to filling the packaging bag with inert gas (such as nitrogen, carbon dioxide) or mixed gas to replace the oxygen in the packaging bag. This packaging method can extend the shelf life of food, and the inert gas can also protect the food in the packaging bag to prevent the food from being squeezed or hit and causing damage to the food.

[0003] A Chinese patent with authorization announcement number CN114148591B discloses an automatic inkjet coding component for a nut packaging machine and a working method thereof. The patent includes two side guard plates and a second conveyor belt installed between the two side guard plates. A stabilizing plate is connected between the two ends of the two side guard plates. A guide mechanism is installed on both sides between the two stabilizing plates. The guide mechanism is arranged above the second conveyor belt. The guide mechanism includes two mounting plates. The bottoms of the two mounting plates are rotatably installed with squeezing rollers along the length direction. The inclination angle of the squeezing roller can be adjusted below the mounting plates. A third conveyor belt is installed along the length direction above the opposite sides of the two mounting plates. A spray terminal is installed on the mounting plate on one side of the guide mechanism.

[0004] The above patent sets a third conveyor belt so that during the movement of the packaging bag, the third conveyor belts on both sides squeeze the seal at the top of the packaging bag, and the third conveyor belt can drive the packaging bag to move toward the spray terminal, assist the operation of the second conveyor belt, and limit the packaging bag from the top to avoid the situation where the top of the packaging bag is blocked and the entire packaging bag is tilted. The third conveyor belts on both sides can press the seal at the packaging bag, making the seal smoother and the internal sealing strip pressed more tightly, thereby making the sealing effect of the seal better, which is conducive to improving the packaging effect of the packaging bag.

[0005] However, the above patent can only code packaging bags that adopt flexible packaging, and cannot code packaging bags that adopt vacuum packaging and modified atmosphere packaging. Summary of the invention

[0006] The invention provides a packaging bag coding machine and a coding method, aiming to solve the problem that the related technology cannot code packaging bags using vacuum packaging and modified atmosphere packaging.

[0007] The packaging bag coding machine of the present invention comprises: a first conveyor belt, a coding mechanism, a first positioning component and a second positioning component;

[0008] The coding mechanism can spray codes on packaging bags;

[0009] The first positioning assembly includes a first lifting mechanism, a first horizontal moving mechanism and a first positioning plate. The first horizontal moving mechanism is arranged on the first lifting mechanism. The first positioning plate is arranged on the first horizontal moving mechanism. The second positioning assembly has the same structure as the first positioning assembly, and includes a second lifting mechanism, a second horizontal moving mechanism and a second positioning plate. The first positioning assembly and the second positioning assembly are symmetrically distributed on both sides of the first conveyor belt.

[0010] Beneficial effects: When coding the packaging bags of vacuum packaging, the first positioning plate moves to the side of the first conveyor belt and is slightly higher than the first conveyor belt, the second positioning plate moves to the top of the first conveyor belt, the packaging bag is placed on the first conveyor belt, the top seal of the packaging bag is placed on the first positioning plate, the bottom of the packaging bag stops against the second positioning plate, and when the packaging bag passes through the coding mechanism, the coding mechanism codes the top seal of the packaging bag; when coding the packaging bags of soft packaging, the first positioning plate moves to the top of the first conveyor belt, with a gap between the two, the second positioning plate moves to the first conveyor belt, the packaging bag is placed on the first conveyor belt, and its top seal is located in the gap between the first positioning plate and the first conveyor belt, the first positioning plate moves horizontally and approaches the second positioning plate, thereby pushing the packaging bag Food particles are kept away from the seal at the top of the packaging bag to prevent unevenness at the coding area caused by the presence of food particles. When the packaging bag passes through the coding mechanism, the coding mechanism can code the seal of the packaging bag; when coding the packaging bag of modified atmosphere packaging, the first positioning plate and the second positioning plate are both moved to the top of the first conveyor belt, the first positioning plate and the second positioning plate are parallelly and spaced apart, and there is a gap between the first conveyor belt and the first positioning plate. The coding mechanism is located between the first positioning plate and the second positioning plate, and the packaging bag is placed on the first conveyor belt. The first positioning plate and the second positioning plate respectively squeeze the two ends of the packaging bag, so that the middle area of ​​the packaging bag is fully unfolded to prevent wrinkles in the middle area of ​​the packaging bag. When the packaging bag passes through the coding mechanism, the coding mechanism codes the middle area of ​​the packaging bag.

[0011] Preferably, the first positioning plate is a frame structure, in which the second conveyor belt is rotatably engaged, and the bottom end of the second conveyor belt extends out of the first positioning plate. The second positioning plate has the same structure as the first positioning plate, and a third conveyor belt is rotatably engaged therein.

[0012] The effect is that the second conveyor belt and the third conveyor belt move synchronously with the first conveyor belt, which can prevent the packaging bag from rubbing against the first positioning plate or the second positioning plate, thereby preventing the packaging bag from being damaged.

[0013] Preferably, the first conveyor belt, the second conveyor belt and the third conveyor belt are each provided with an exhaust device, and the first conveyor belt, the second conveyor belt and the third conveyor belt are provided with a plurality of ventilation holes distributed at intervals, and the exhaust device can exhaust air from the outside through the ventilation holes.

[0014] The effect is that the air suction device can form negative pressure on the corresponding first conveyor belt, second conveyor belt and third conveyor belt, so as to adsorb the packaging bag and fix the packaging bag.

[0015] Preferably, a first driving member is provided on the positioning plate, and a limit plate is provided at the output end of the first driving member. The first driving member can drive the limit plate to move up and down, and the limit plate is intersected with the positioning plate. One end of the limit plate can stop against the positioning plate, and there is a gap between the other end and the positioning plate, and the width of the gap is greater than the size of the coding mechanism.

[0016] The effect is that when coding the packaging bag of the soft package, the first positioning plate does not need to be moved, and it is only necessary to drive the limiting plate to be lowered by the first driving member. When the packaging bag moves, the food particles in the packaging bag pass through the limiting plate and gradually move away from the seal at the top of the packaging bag along the limiting plate. The coding mechanism is located in the gap between the limiting plate and the first positioning plate, and can code the packaging bag passing by.

[0017] Preferably, the limiting plate is provided with a bevel end, and the bevel of the bevel end can abut against the positioning plate.

[0018] The effect is that the inclined surface end is arranged on the limit plate, which can prevent the limit plate from hitting the first positioning plate when moving up and down, and prevent the first positioning plate from hindering the limit plate from moving up and down.

[0019] Preferably, the first lifting mechanism is a hydraulic cylinder, the first horizontal moving mechanism includes a fixed plate and a second driving member, the fixed plate is fixedly connected to the output end of the first lifting mechanism, the second driving member is a hydraulic cylinder, and is fixedly connected to the fixed plate, and the output end of the second driving member is fixedly connected to the first positioning plate.

[0020] Preferably, a cross slide is provided on the fixed plate, the coding mechanism is arranged on the cross slide, and the cross slide is used to drive the coding mechanism to move in a horizontal plane.

[0021] Preferably, the cross slide includes a transverse guide rail, a lead screw, a movable seat and a telescopic rod. The transverse guide rail is fixedly connected to the fixed plate, the lead screw is rotatably engaged above the transverse guide rail, the movable seat is slidably engaged on the transverse guide rail, and the movable seat is threadedly engaged with the lead screw. The telescopic rod is arranged in the movable seat, one end of which is connected to the movable seat, and the other end of which is connected to the coding mechanism.

[0022] A packaging bag coding method, applied to any of the packaging bag coding machines described above, is characterized by comprising the following steps:

[0023] To code the vacuum-packed packaging bag, the first positioning plate moves to the side of the first conveyor belt and is slightly higher than the first conveyor belt, the second positioning plate moves to the top of the first conveyor belt, the packaging bag is placed on the first conveyor belt, the top seal of the packaging bag is placed on the first positioning plate, and the bottom of the packaging bag is stopped against the second positioning plate. When the packaging bag passes through the coding mechanism, the coding mechanism codes the top seal of the packaging bag;

[0024] For coding of soft-packaged packaging bags, the first positioning plate moves to above the first conveyor belt, with a gap between the two, the second positioning plate moves to the first conveyor belt, the packaging bag is placed on the first conveyor belt, and its top seal is located in the gap between the first positioning plate and the first conveyor belt, the first positioning plate moves horizontally and approaches the second positioning plate, thereby pushing the food particles in the packaging bag away from the seal at the top of the packaging bag, and when the packaging bag passes through the coding mechanism, the coding mechanism codes the top seal of the packaging bag;

[0025] For coding of modified atmosphere packaged bags, the first positioning plate and the second positioning plate are both moved to the top of the first conveyor belt, the first positioning plate and the second positioning plate are distributed in parallel and spaced apart, and there is a gap between both of them and the first conveyor belt, the coding mechanism is located between the first positioning plate and the second positioning plate, the packaging bag is placed on the first conveyor belt, the first positioning plate and the second positioning plate respectively squeeze the two ends of the packaging bag so that the middle area of ​​the packaging bag is fully unfolded, and when the packaging bag passes through the coding mechanism, the coding mechanism codes the middle area of ​​the packaging bag.

[0026] By adopting the above technical solution, the beneficial effects of the present invention are:

[0027] 1. When the packaging bag coding machine of the present invention codes the packaging bag of vacuum packaging, the first positioning plate moves to the side of the first conveyor belt and is slightly higher than the first conveyor belt, the second positioning plate moves to above the first conveyor belt, the packaging bag is placed on the first conveyor belt, the top seal of the packaging bag is placed on the first positioning plate, the bottom of the packaging bag is stopped against the second positioning plate, and when the packaging bag passes through the coding mechanism, the coding mechanism codes the top seal of the packaging bag.

[0028] 2. When the packaging bag coding machine of the present invention codes the packaging bags of soft packages, the first positioning plate moves to above the first conveyor belt with a gap therebetween, the second positioning plate moves onto the first conveyor belt, the packaging bag is placed on the first conveyor belt, and its top seal is located in the gap between the first positioning plate and the first conveyor belt, the first positioning plate moves horizontally and approaches the second positioning plate, thereby pushing the food particles in the packaging bag away from the seal at the top of the packaging bag to prevent the coding area from being uneven due to the presence of food particles, and when the packaging bag passes through the coding mechanism, the coding mechanism can code the seal of the packaging bag.

[0029] 3. When the packaging bag coding machine of the present invention codes the packaging bags of modified atmosphere packaging, the first positioning plate and the second positioning plate are both moved to the top of the first conveyor belt, the first positioning plate and the second positioning plate are spaced apart in parallel, and there is a gap between the first conveyor belt and the first positioning plate. The coding mechanism is located between the first positioning plate and the second positioning plate, and the packaging bag is placed on the first conveyor belt. The first positioning plate and the second positioning plate respectively squeeze the two ends of the packaging bag so that the middle area of ​​the packaging bag is fully unfolded to prevent wrinkles in the middle area of ​​the packaging bag. When the packaging bag passes through the coding mechanism, the coding mechanism codes the middle area of ​​the packaging bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the structure of a packaging bag coding machine according to an embodiment of the present invention.

[0031] Figure 2 It is a schematic diagram of the structure of the first positioning component of an embodiment of the present invention.

[0032] Figure 3 Schematic diagram of the cross slide structure of an embodiment of the present invention.

[0033] Figure 4 It is a schematic diagram of the structure of the first positioning plate according to an embodiment of the present invention.

[0034] Figure 5 The figure is a schematic diagram of coding a vacuum packaging bag by a packaging bag coding machine according to an embodiment of the present invention.

[0035] Figure 6 The figure is a schematic diagram of coding a flexible packaging bag by the packaging bag coding machine according to an embodiment of the present invention.

[0036] Figure 7 The figure is a schematic diagram of coding a modified atmosphere packaging bag by the packaging bag coding machine according to an embodiment of the present invention.

[0037] Reference numerals:

[0038] 1. First conveyor belt; 2. Coding mechanism; 3. First positioning assembly; 31. First lifting mechanism; 321. Fixed plate; 322. Second driving member; 33. First positioning plate; 4. Second positioning assembly; 41. Second positioning plate; 5. First driving member; 6. Limiting plate; 7. Cross slide; 71. Transverse guide rail; 72. Lead screw; 73. Moving seat; 74. Telescopic rod; 8. Second conveyor belt; 9. Third conveyor belt. DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0040] like Figures 1 to 7 As shown, the packaging bag coding machine of the present invention comprises: a first conveyor belt 1, a coding mechanism 2, a first positioning component 3 and a second positioning component 4.

[0041] Specifically, Figure 1 and Figure 2 As shown, a support frame is provided at the bottom of the first conveyor belt 1, and the support frame is supported on the ground. The first conveyor belt 1 rotates with the support frame and is used to transfer packaging bags. The first positioning assembly 3 includes a first lifting mechanism 31, a first horizontal moving mechanism and a first positioning plate 33. The first lifting mechanism 31 is a hydraulic cylinder, which is located next to the first conveyor belt 1. The first horizontal moving mechanism includes a fixed plate 321 and a second driving member 322. The fixed plate 321 is fixedly connected to the top of the first lifting mechanism 31. The second driving member 322 is a hydraulic cylinder, one end of which is fixedly connected to the fixed plate 321, and the other end is fixedly connected to the first positioning plate 33. The second positioning assembly 4 has the same structure as the first positioning assembly 3, and includes a second lifting mechanism, a second horizontal moving mechanism and a second positioning plate 41. The first positioning assembly 3 and the second positioning assembly 4 are symmetrically distributed on both sides of the first conveyor belt 1.

[0042] like Figure 2 and Figure 3 As shown, a cross slide 7 is also provided on the fixed plate 321 in the first positioning assembly 3. The cross slide 7 includes a transverse guide rail 71, a lead screw 72, a movable seat 73 and a telescopic rod 74. The transverse guide rail 71 is fixedly connected to the fixed plate 321 and is distributed parallel to the first conveyor belt 1. The lead screw 72 is rotatably engaged on the transverse guide rail 71. The movable seat 73 slides and slidably engages with the transverse guide rail 71. The movable seat 73 is threadedly engaged with the lead screw 72. The rotation of the lead screw 72 can drive the movable seat 73 to move forward and backward. The telescopic rod 74 is slidably engaged in the movable seat 73 and can extend out of the movable seat 73. The coding mechanism 2 is fixedly connected to the end of the telescopic rod 74. The coding mechanism 2 is an inkjet printer in conventional technology. The cross slide 7 can drive the coding mechanism 2 to move in a horizontal plane.

[0043] like Figure 1 As shown, the second conveyor belt 8 is rotatably fitted in the first positioning plate 33, and the third conveyor belt 9 is rotatably fitted in the second positioning plate 41. The first conveyor belt 1, the second conveyor belt 8 and the third conveyor belt 9 are each provided with an exhaust device, which is an exhaust fan. The first conveyor belt 1, the second conveyor belt 8 and the third conveyor belt 9 are each provided with a plurality of ventilation holes distributed at intervals. The exhaust device can draw outside air into the corresponding first conveyor belt 1 or the second conveyor belt 8 or the third conveyor belt 9 through the ventilation holes, thereby forming a negative pressure on the surface of the first conveyor belt 1, the second conveyor belt 8 and the third conveyor belt 9, and can fix the packaging bag on the first conveyor belt 1, the second conveyor belt 8 and the third conveyor belt 9.

[0044] like Figure 2 and Figure 4 As shown, the rear end of the first positioning plate 33 is also provided with a first driving member 5, which is a hydraulic cylinder. The first driving member 5 is fixedly connected to the first positioning plate 33, and a limiting plate 6 is fixedly connected to the output end of the first driving member 5. The first driving member 5 is used to drive the limiting plate 6 to move up and down. The limiting plate 6 is intersected with the first positioning plate 33, and its front end can stop against the first positioning plate 33, and there is a gap between its rear end and the first positioning plate 33. The front end of the limiting plate 6 is a bevel end, and the bevel end of the bevel end can stop against the positioning plate. The bevel end is provided to prevent the first positioning plate 33 from hindering the limiting plate 6 from moving up and down.

[0045] According to the packaging bag coding machine of the embodiment of the present invention, the coding method thereof comprises the following steps:

[0046] When coding vacuum-packed packaging bags, Figure 5 As shown, the first lifting mechanism 31 and the first horizontal moving mechanism drive the first positioning plate 33 to move to the left side of the first conveyor belt 1, the second lifting mechanism and the second horizontal moving mechanism drive the second positioning plate 41 to move to the top of the first conveyor belt 1, and make the side wall of the first positioning plate 33 stop against the first conveyor belt 1, and at the same time make the top surface of the first positioning plate 33 slightly higher than the first conveyor belt 1, the first conveyor belt 1 transfers the packaging bag from its front end to its rear end, the top sealing part of the packaging bag is placed on the second conveyor belt 8, the top of the packaging bag stops against the second positioning plate 41, and the exhaust device exhausts air. , the vacuum devices in the first conveyor belt 1 and the second conveyor belt 8 are started, and negative pressure is formed on the surfaces of the first conveyor belt 1 and the second conveyor belt 8. The negative pressure formed on the first conveyor belt 1 can fix the packaging bag on the first conveyor belt 1, and the negative pressure formed on the second conveyor belt 8 can fix the top seal of the packaging bag on the second conveyor belt 8. The first conveyor belt 1 and the second conveyor belt 8 move synchronously. When the packaging bag passes through the coding mechanism 2, the coding mechanism 2 can code at the top seal of the packaging bag. The second conveyor belt 8 can prevent the top seal of the packaging bag from tilting, which affects the coding quality.

[0047] When coding the packaging bags that are packed in flexible packaging, Figure 6 As shown, the first lifting mechanism 31 and the first horizontal moving mechanism drive the first positioning plate 33 to move above the first conveyor belt 1, and a gap is left between the first positioning plate 33 and the first conveyor belt 1, and the height of the gap is smaller than the particle size of the food particles in the packaging bag, and the first driving member 5 drives the limiting plate 6 to move downward, so that the bottom end of the limiting plate 6 is flush with the bottom end of the first positioning plate 33, and the second lifting mechanism and the second horizontal moving mechanism drive the second positioning plate 41 to move above the first conveyor belt 1, and make the second positioning plate 41 and the first positioning plate 33 parallel and spaced apart, and then the coding mechanism 2 is moved to the gap between the limiting plate 6 and the first positioning plate 33 through the cross slide 7. The packaging bag is placed on the first conveyor belt 1, and the first conveyor belt 1 pushes the packaging bag to move from front to back. The top end of the packaging bag is located in the gap between the first positioning plate 33 and the first conveyor belt 1, and the bottom end of the packaging bag is stopped at the second positioning plate 41. When the packaging belt passes through the limiting plate 6, the limiting plate 6 can move the food particles at the top end of the packaging bag toward the rear end of the packaging bag, thereby ensuring the flatness of the front end of the packaging bag. When the packaging bag passes through the coding mechanism 2, the coding mechanism 2 can code the top end of the packaging bag.

[0048] When coding bags that are packaged in modified atmosphere packaging, Figure 7 As shown, the first lifting mechanism 31 and the first horizontal moving mechanism drive the first positioning plate 33 to move above the first conveyor belt 1, and the second lifting mechanism and the second horizontal moving mechanism drive the second positioning plate 41 to move above the first conveyor belt 1. The first positioning plate 33 and the second positioning plate 41 are parallel and spaced apart, and there is a gap between both and the first rotating belt. The coding mechanism 2 is moved between the first positioning plate 33 and the second positioning plate 41 through the cross slide 7, and the packaging bag is placed on the first conveyor belt 1. The first positioning plate 33 squeezes the top area of ​​the packaging bag, and the second positioning plate 41 squeezes the bottom area of ​​the packaging bag, so that the middle area of ​​the packaging bag can be fully unfolded to prevent wrinkles from occurring in the middle area of ​​the packaging bag. The exhaust devices in the second conveyor belt 8 and the third conveyor belt 9 are started to prevent the packaging bag from shaking. When the packaging bag passes through the coding mechanism 2, the coding mechanism 2 can code the middle area of ​​the packaging bag.

[0049] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A packaging bag coding machine, comprising: First conveyor belt; Coding mechanism, which can spray codes on packaging bags; It is characterized in that it also includes a first positioning assembly and a second positioning assembly, the first positioning assembly includes a first lifting mechanism, a first horizontal moving mechanism and a first positioning plate, the first horizontal moving mechanism is arranged on the first lifting mechanism, the first positioning plate is arranged on the first horizontal moving mechanism, the second positioning assembly has the same structure as the first positioning assembly, and includes a second lifting mechanism, a second horizontal moving mechanism and a second positioning plate, and the first positioning assembly and the second positioning assembly are symmetrically distributed on both sides of the first conveyor belt; The first positioning plate is a frame structure, in which the second conveyor belt is rotatably matched, and the bottom end of the second conveyor belt extends out of the first positioning plate. The second positioning plate has the same structure as the first positioning plate, and in which the third conveyor belt is rotatably matched; The first conveyor belt, the second conveyor belt and the third conveyor belt are all provided with an exhaust device, and the first conveyor belt, the second conveyor belt and the third conveyor belt are provided with a plurality of vents distributed at intervals, and the exhaust device can exhaust air from the outside through the vents; A first driving member is provided on the positioning plate, and a limiting plate is provided at the output end of the first driving member. The first driving member can drive the limiting plate to move up and down. The limiting plate intersects with the positioning plate, and one end of the limiting plate can stop against the positioning plate, and there is a gap between the other end and the positioning plate, and the width of the gap is greater than the size of the coding mechanism.

2. The packaging bag coding machine according to claim 1, characterized in that: The limiting plate is provided with an inclined surface end, and the inclined surface of the inclined surface end can abut against the positioning plate.

3. The packaging bag coding machine according to claim 1, characterized in that: The first lifting mechanism is a hydraulic cylinder, the first horizontal moving mechanism includes a fixed plate and a second driving member, the fixed plate is fixedly connected to the output end of the first lifting mechanism, the second driving member is a hydraulic cylinder, and is fixedly connected to the fixed plate, and the output end of the second driving member is fixedly connected to the first positioning plate.

4. The packaging bag coding machine according to claim 3, characterized in that: A cross slide is provided on the fixed plate, the coding mechanism is provided on the cross slide, and the cross slide is used to drive the coding mechanism to move in a horizontal plane.

5. The packaging bag coding machine according to claim 4, characterized in that: The cross slide comprises a transverse guide rail, a lead screw, a movable seat and a telescopic rod. The transverse guide rail is fixedly connected to the fixed plate. The lead screw is rotatably engaged above the transverse guide rail. The movable seat is slidably engaged on the transverse guide rail, and the movable seat is threadedly engaged with the lead screw. The telescopic rod is arranged in the movable seat, one end of which is connected to the movable seat, and the other end of which is connected to the coding mechanism.

6. A packaging bag coding method, applied to the packaging bag coding machine according to any one of claims 1 to 5, characterized in that: The following steps are involved: To code the vacuum-packed packaging bag, the first positioning plate moves to the side of the first conveyor belt and is slightly higher than the first conveyor belt, the second positioning plate moves to the top of the first conveyor belt, the packaging bag is placed on the first conveyor belt, the top seal of the packaging bag is placed on the first positioning plate, and the bottom of the packaging bag is stopped against the second positioning plate. When the packaging bag passes through the coding mechanism, the coding mechanism codes the top seal of the packaging bag; For coding of soft-packaged packaging bags, the first positioning plate moves to above the first conveyor belt, with a gap between the two, the second positioning plate moves to the first conveyor belt, the packaging bag is placed on the first conveyor belt, and its top seal is located in the gap between the first positioning plate and the first conveyor belt, the first positioning plate moves horizontally and approaches the second positioning plate, thereby pushing the food particles in the packaging bag away from the seal at the top of the packaging bag, and when the packaging bag passes through the coding mechanism, the coding mechanism codes the top seal of the packaging bag; For coding of modified atmosphere packaged bags, the first positioning plate and the second positioning plate are both moved to the top of the first conveyor belt, the first positioning plate and the second positioning plate are distributed in parallel and spaced apart, and there is a gap between both of them and the first conveyor belt, the coding mechanism is located between the first positioning plate and the second positioning plate, the packaging bag is placed on the first conveyor belt, the first positioning plate and the second positioning plate respectively squeeze the two ends of the packaging bag so that the middle area of ​​the packaging bag is fully unfolded, and when the packaging bag passes through the coding mechanism, the coding mechanism codes the middle area of ​​the packaging bag.

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