Bag mouth shrinking mechanism and bag mouth shrinking method
By designing a shrink bag mechanism including a fixing bracket, a product fixing mechanism, a shrinking mechanism, a bag clamping mechanism and a vacuum suction rod, the problem of inability to effectively discharge the air in the bag during tightening and heat sealing of the packaging bag in the prior art is solved, and the automatic storage and vacuum extraction of the packaging bag is realized, which facilitates sampling and testing.
Patent Information
- Application Number
- CN202411895654.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-03-18
AI Technical Summary
In the process of tightening and heat sealing of the packaging bag mouth, the air in the bag cannot be effectively discharged, resulting in a large packaging volume and inconvenient packaging damage during sampling and testing.
A shrink bag opening mechanism is designed, including a fixing bracket, product fixing mechanism, shrinking mechanism, bag clamping mechanism and vacuum suction rod. Through the coordinated movement of the cylinder and push block, the bag opening is automatically bagged, folded and stored, and the vacuum suction rod is pumped to reduce the invalid volume of the packaging bag.
It realizes automatic storage and vacuuming of packaging bags, reduces the invalid volume of packaging bags, facilitates sampling and inspection, and does not require damage to packaging bags.
Smart Images
Figure CN119637179A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of product packaging, in particular to a bag opening shrinking mechanism and a bag opening shrinking method. Background Art
[0002] After current product packaging (such as cup lids) is packaged in a transparent plastic bag, the bag mouth needs to be tightened and stuffed into the product. Existing technology achieves this process through equipment that shrinks and heat-seals the bag mouth, but it mainly relies on a belt drive assembly to tighten the bag mouth. The disadvantage of this method is that the air in the packaging bag cannot be effectively discharged, resulting in a large packaging volume; in addition, once the heat seal is completed, it becomes inconvenient to sample and test the product. Therefore, it is now urgent to design an automated packaging mechanism that can not only realize the automatic assembly, folding and storage of product packaging bags, but also enable the product to meet the random inspection operation without damaging the packaging bag. Summary of the invention
[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a bag shrinking mechanism and a bag shrinking method to realize automatic bagging, folding and storage of packaging bags without the need for heat sealing of the packaging bags, thereby ensuring that the packaging bags do not need to be destroyed during the random inspection process.
[0004] In order to achieve the above-mentioned purpose, a bag shrinking mechanism is designed, comprising a fixed bracket, and also comprising: a plurality of product fixing mechanisms arranged on the fixed bracket, for fixing the bagged product; a shrinking mechanism arranged on the fixed bracket and located above or below the product fixing mechanism, the shrinking mechanism comprising a shrinking cylinder located on the left and right sides and a push block connected to the telescopic end of the shrinking cylinder, a gap is left between the maximum stroke positions of the two push blocks, and an avoidance gap is also provided in the middle of the push block; a bag clamping mechanism, which is installed on one of the shrinking cylinders of the shrinking mechanism and is located between the product fixing mechanism and the shrinking mechanism, the bag clamping mechanism comprising a bag clamping cylinder and a bag clamping claw connected to the bag clamping cylinder, the bag clamping mechanism moves with the shrinking cylinder, and the bag clamping cylinder starts to move only after the shrinking cylinder moves in place; an upper and lower cylinder installed on the upper or lower part of the fixed bracket, a vacuum suction rod is provided on the upper and lower cylinders, the setting position of the vacuum suction rod cooperates with the avoidance gap of the push block of the shrinking mechanism, and the vacuum suction rod is driven to extend from the avoidance gap of the push block under the movement of the upper and lower cylinders.
[0005] Preferably, the bag shrinking mechanism provided by the present invention also includes other technical features, wherein each product fixing mechanism includes a left product fixing cylinder and a right product fixing cylinder, and the left product fixing cylinder and the right product fixing cylinder are respectively connected to a left clamp and a right clamp for clamping the bagged product.
[0006] Preferably, the bag mouth shrinking mechanism provided by the present invention also includes other technical features, including a buffer limit structure for adjusting the position of the vacuum suction rod extending into the packaging bag, and the buffer limit structure is connected to a spare cylinder, which is used to extend the stroke of the buffer limit structure.
[0007] The present invention also provides a bag shrinking method using the bag shrinking mechanism, and the method is specifically as follows: S1. Grab the bagged product to the top of the mechanism; S2. The upper and lower cylinders drive the vacuum suction rod to rise, extend it from the bag opening, and start to evacuate air; S3. The cylinder of the product fixing mechanism moves to clamp the product; S4. The cylinder of the shrinking mechanism moves to synthesize the bag opening into a linear shape; S5. The bag clamping cylinder moves to clamp the linear bag opening into a columnar shape, and the vacuum suction rod continues to evacuate air; S6. At this time, the gas in the packaging generation is basically exhausted, and the vacuum suction rod retreats; S7. The vacuum suction rod moves again to insert the bag opening into the product, and then retreats; S8. The bag clamping cylinder returns to its position, and the bag clamping claws open, S9. The shrinking cylinder returns to its position; S10. The unloading mechanism clamps the product, the cylinder of the product fixing mechanism retreats, and the unloading mechanism grabs the two products and puts them on the unloading belt.
[0008] Compared with the prior art, the present invention has the following advantages: The automated device of the present invention can realize automated storage of packaging bags, and vacuuming of the packaging bags under negative pressure is realized by a vacuum suction rod, thereby effectively reducing the ineffective volume of the packaging bags. The shape adjustment of the packaging bags during vacuuming and folding and storage after vacuuming are realized by a number of clamping and motion mechanisms. At the same time, the vacuum suction rod can be used as an ejection component to store the packaging bags into the product cavity, thereby realizing automated folding and storage of the packaging bags under negative pressure. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 , is a structural diagram of the device of the present invention; Figure 2 , is a partial structural diagram of the device of the present invention; In the figure: 1. fixed bracket, 2. fixing mechanism, 2-1 left product fixing cylinder, 2-2 right product fixing cylinder, 2-3 left clamp, 2-4 right clamp, 3. shrinking mechanism, 4. shrinking cylinder, 5. push block, 6. notch, 7. bag clamping mechanism, 8. bag clamping cylinder, 9. bag clamping claws, 10. upper and lower cylinders, 11. vacuum suction rod, 12. buffer limit structure, 13. spare cylinder. DETAILED DESCRIPTION
[0010] In order to make the purpose, principle and structure of the present invention more clear, it is further described below in conjunction with the drawings and specific embodiments.
[0011] Embodiment 1: See also Figure 1 , Figure 2 , this embodiment provides a bag opening shrinking mechanism, including: The fixed bracket 1 comprises a plurality of multi-section frame structures, wherein the plurality of frame structures are fixedly connected and have a hollow cavity in the transverse direction.
[0012] A fixing mechanism 2 is arranged on the top surface of the fixing bracket 1, and the fixing mechanism 2 includes a plurality of left product fixing cylinders 2-1 and right product fixing cylinders 2-2 which are respectively arranged oppositely and laterally on the top surfaces of the left and right fixing brackets 1. The left product fixing cylinder 2-1 and the right product fixing cylinder 2-2 are arranged oppositely, and the extension surface of the telescopic rod of the left product fixing cylinder 2-1 faces the right side, and the extension surface of the telescopic rod of the right product fixing cylinder 2-2 faces the left side. A left clamp 2-3 with a notch facing the right side is also arranged on the telescopic rod of the left product fixing cylinder 2-1, and a right clamp 2-4 with a notch facing the left side is arranged on the telescopic rod of the right product fixing cylinder 2-2. The notches of the left clamp 2-3 and the right clamp 2-4 are matched with the shape of the product to be clamped, so as to realize the clamping of the bagged product, and can be changed according to the change of the product shape.
[0013] The shrinking mechanism 3 is horizontally arranged on the fixed bracket 1 and below the fixed mechanism 2. The shrinking mechanism 3 includes a plurality of shrinking cylinders 4 arranged opposite to each other on the left and right sides. The telescopic rod of the shrinking cylinder 4 is provided with a push block 5 with a notch 6. The push block 5 can be mutually based and fitted under the action of the telescopic rod. The notches 6 on the push block 5 cooperate with each other to form a circular air avoidance structure. The shrinking cylinder 4 is arranged directly below the fixed cylinder to achieve the clamping of the packaging bag extending below the product clamped by the fixed mechanism 2. The packaging bag is squeezed into a straight line under the action of the push block 5, and a cylindrical gas channel is retained under the action of the air avoidance structure of the notch 6.
[0014] A bag clamping mechanism 7 is horizontally arranged on the fixed bracket 1, between the fixing mechanism 2 and the shrinking mechanism 3, and the bag clamping mechanism 7 includes a plurality of entrainment cylinders 8, and the bag clamping cylinders 8 are provided with bag clamping claws 9, and the bag clamping claws 9 are strips arranged front and back, and the strips can fit tightly. The bag clamping claws 9 can be opened and closed by driving the bag clamping cylinders 8, and are used for squeezing and clamping the packaging bag that is squeezed into a straight line by the shrinking mechanism 3 under a negative pressure state in the front and rear directions, so that the packaging bag changes from a straight line to a vertical columnar shape.
[0015] The numerical value is set at the bottom of the fixed bracket 1 and below the shrinking mechanism 3. The spare cylinder 13 is fixedly connected to the fixed bracket 1 on one side and fixedly connected to the upper and lower cylinders 10 on the other side. A vacuum suction rod 11 is arranged on the upper and lower cylinders 10 in the vertical direction. The central axis of the vacuum suction rod 11 is on the same axis as the central axis of the clamped product and the central axis of the air avoidance structure of the notch 6. The vacuum suction rod 11 is driven up and down in the vertical direction by driving the upper and lower cylinders 10. And when the push blocks 5 of the shrinking mechanism 3 are attached to each other, it can directly pass through the air avoidance structure of the notch 6 without forming a limit collision. The vertical stroke of the vacuum suction rod 11 can make the top of the vacuum suction rod 11 reach the cavity of the product. The vacuum suction rod 11 can also realize the function of negative pressure vacuuming to extract the air in the packaging bag.
[0016] The buffering and limiting structure 12 is arranged in the middle of the fixed bracket 1. The buffering and limiting structure 12 includes a plurality of zigzag frame structures and a flexible buffer fixedly arranged at one end of the zigzag frame structure. The zigzag frame structure forms an avoidance structure with the backup cylinder 13 and the upper and lower cylinders 10 respectively. The flexible buffer is aligned with the upper end surface of the upper and lower cylinders 10. When the upper and lower cylinders 10 cannot work normally, driving the backup cylinder 13 can drive the upper and lower cylinders 10 to move up and down in the vertical direction, and can also drive the vacuum suction rod 11 to move up and down. At this time, there is a risk that the upper and lower cylinders 10 that have failed and are damaged are not in the lowest stroke position. If the backup cylinder 13 moves up and down according to the maximum stroke, the highest stroke position of the vacuum suction rod 11 will inevitably be higher than the safe stroke position, causing the vacuum suction rod 11 to collide with the product. At this time, when the upper and lower cylinders 10 are lifted along with the backup cylinder 13, the upper and lower cylinders 10 will collide with the flexible buffer. Since the flexible buffer is fixed on the zigzag frame structure, a reaction force will be applied to the upper and lower cylinders 10 that have not returned to the lowest stroke position. The reaction force is equal to the lifting force of the backup cylinder 13. Under the action of the reaction force, the upper and lower cylinders 10 that have not returned to the lowest stroke position can be pushed downward along the track back to the lowest stroke position. That is, the damaged upper and lower cylinders 10 that have not returned to the lowest stroke position can be returned to a safe position through the buffer limit structure 12.
[0017] Embodiment 2: This embodiment provides a bag opening shrinking method using the bag opening shrinking mechanism.
[0018] The method is specifically as follows: S1. Grab the bagged product to the top of the mechanism; S2. The upper and lower cylinders 10 drive the vacuum suction rod 11 to rise, extend it from the bag opening, and start to pump air; S3. The cylinder of the product fixing mechanism 2 moves to clamp the product; S4. The cylinder of the shrinking mechanism 4 moves to synthesize the bag opening into a straight line; S5. The bag clamping cylinder moves 8 to clamp the straight bag opening into a column, and the vacuum suction rod 11 continues to pump air; S6. At this time, the gas in the packaging is basically exhausted, and the vacuum suction rod 11 retreats; S7. The vacuum suction rod 11 moves again, inserts the bag opening into the product, and then retreats; S8. The bag clamping cylinder 8 returns to its position, and the bag clamping claws 9 open, S9. The shrinking cylinder 4 returns to its position; S10. The unloading mechanism clamps the product, the cylinder of the product fixing mechanism 2 retreats, and the unloading mechanism grabs the two products and puts them on the unloading belt.
[0019] It is worth noting that after vacuuming and folding of several mechanisms, the cylindrical packaging bag is fully fitted with the bag wall under vacuum state. At this time, the retreating vacuum suction rod 11 cannot enter the gap of the packaging bag when it is lifted again, and the outer wall of the packaging bag will be directly lifted. The flexible packaging bag will be deformed and folded under the lifting action of the vacuum suction rod 11, and finally inserted into the cavity of the product with the lifting. The whole process does not require heat sealing, nor does it need to set up a separate storage mechanism after vacuuming, which improves work efficiency and reduces production costs.
[0020] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent substitutions or changes according to the technical solutions and novel concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.
Claims
1. A bag opening shrinking mechanism, comprising a fixing bracket, characterized in that: Also includes: A plurality of product fixing mechanisms disposed on the fixing bracket, for fixing the bagged products; A shrinking mechanism is arranged on the fixed bracket and is located above or below the product fixing mechanism, the shrinking mechanism includes shrinking cylinders located on the left and right sides and push blocks connected to the telescopic ends of the shrinking cylinders, a gap is left between the maximum stroke positions of the two push blocks, and an avoidance notch is also provided in the middle of the push block; The bag clamping mechanism is installed on one of the shrinking cylinders of the shrinking mechanism and is located between the product fixing mechanism and the shrinking mechanism. The bag clamping mechanism includes a bag clamping cylinder and a bag clamping claw connected to the bag clamping cylinder. The bag clamping mechanism moves together with the shrinking cylinder. The bag clamping cylinder starts to move only after the shrinking cylinder moves into place. The upper and lower cylinders are installed on the upper or lower part of the fixed bracket. The upper and lower cylinders are provided with vacuum suction rods. The setting position of the vacuum suction rod matches the avoidance gap of the push block of the shrinking mechanism. Under the movement of the upper and lower cylinders, the vacuum suction rod is driven to extend into the avoidance gap of the push block.
2. A bag opening shrinking mechanism as claimed in claim 1, characterized in that: Each product fixing mechanism comprises a left product fixing cylinder and a right product fixing cylinder, and the left product fixing cylinder and the right product fixing cylinder are respectively connected to a left clamp and a right clamp for clamping the bagged product.
3. A bag opening shrinking mechanism as claimed in claim 1, characterized in that: It also includes a buffering and limiting structure for adjusting the position of the vacuum suction rod extending into the packaging bag. The buffering and limiting structure is connected to a spare cylinder, and the spare cylinder is used to extend the stroke of the buffering and limiting structure.
4. A bag opening shrinking method using the bag opening shrinking mechanism as claimed in any one of claims 1 to 3, characterized in that: The method is specifically as follows: S1. Grab the bagged product to the top of the mechanism; S2. The upper and lower cylinders drive the vacuum suction rod to rise, extend it into the bag opening, and start to pump air; S3. The cylinder of the product fixing mechanism moves to clamp the product; S4. The cylinder of the shrinking mechanism moves to close the bag mouth into a straight line; S5. The bag clamping cylinder moves to clamp the linear bag opening into a columnar shape, and the vacuum suction rod continues to pump air; S6. At this time, the gas in the packaging is basically exhausted, and the vacuum suction rod is retracted; S7. The vacuum suction rod moves again, inserts the bag mouth into the product, and then returns; S8. The bag clamping cylinder returns to its original position, and the bag clamping jaws open. S9. The shrink cylinder returns to its original position; S10. The unloading mechanism clamps the product, the cylinder of the product fixing mechanism retracts, and the unloading mechanism grabs the two products and puts them on the unloading belt.