Bag pressing device of bag making machine

Abstract

The utility model relates to bag making machine technical field, especially a kind of bag making machine bag pressing device, including rack, fixed plate for placing bag for being located on rack, material inlet end for being located on rack at fixed plate and being used to bend bag and prevent being blown away and beat material device, further include: through needle bag device be located on rack and be located below fixed plate several roots of bag collecting needle, be located on fixed plate and be used to pass through several first needle hole of bag collecting needle, through lower pressing device and be located on rack and be located above fixed plate pressboard, be located on pressboard and be used to pass through several second needle hole of bag collecting needle, still be equipped with several bag pressing telescopic parts for bag compression on the pressboard, the telescopic rod of bag pressing telescopic part passes through pressboard for bag compression, after the telescopic rod of bag pressing telescopic part contracts, the lower surface of pressboard is even.

Description

Technical Field

[0001] This utility model relates to the field of bag making machine technology, and in particular to a bag pressing device for a bag making machine. Background Technology

[0002] After the bag-making machine completes bag forming, heat sealing, and cutting, the finished bags need to be collected into stacks by a bag-collecting device. There are two main types of existing bag-collecting devices: one type uses collecting needles to puncture the bag body for collection, offering stable positioning and a simple structure, but leaving needle holes in the bag body, making it unsuitable for bags with high sealing and barrier requirements; the other type uses negative pressure adsorption, clamping conveying, and other needle-free bag collection methods, which avoids needle holes but cannot create functional perforations when needed. However, in actual production, some bags require perforations such as ventilation holes, hanging holes, and drawstring holes. Processing these separately after bag collection would increase the number of steps and costs. Therefore, existing bag-collecting devices cannot handle both needle-based and needle-free bag collection on the same equipment, and cannot flexibly choose whether to create needle holes based on bag type, resulting in poor adaptability. Utility Model Content

[0003] Therefore, in view of the above problems, this utility model proposes a bag pressing device for a bag making machine.

[0004] To achieve the above objectives, the technical solution of this utility model is to provide a bag pressing device for a bag making machine, including a frame, a fixed plate on the frame for placing bags, and a feeding device on the frame located at the feed end of the fixed plate for bending the bags to prevent them from being blown away. It also includes: a plurality of bag collecting needles mounted on the frame and located below the fixed plate via a needle-bag device; a plurality of first needle holes on the fixed plate for the bag collecting needles to pass through; a pressure plate mounted on the frame and located above the fixed plate via a pressing device; and a plurality of second needle holes on the pressure plate for the bag collecting needles to pass through. The pressure plate is also provided with a plurality of bag pressing telescopic components for pressing the bags. The telescopic rods of the bag pressing telescopic components pass through the pressure plate to press the bags. After the telescopic rods of the bag pressing telescopic components are retracted, the lower surface of the pressure plate is flat.

[0005] A further improvement is that a buffer ring is connected to the telescopic rod of the pressure bag telescopic component, and a receiving groove is provided on the pressure plate to accommodate the buffer ring, so as to ensure that the lower surface of the pressure plate is flat.

[0006] A further improvement is made to the needle bag device, which includes: several second guide rods located at the bottom of a fixed plate; fixed mounting plates are provided between each pair of second guide rods; needle adjustment telescopic components are provided on the fixed mounting plates; a movable plate is provided on the telescopic rod of the needle adjustment telescopic components; a second guide seat that cooperates with the second guide rods is provided on the movable plate; a needle mounting plate is provided on the movable plate; a heightening bracket is also provided between the needle mounting plate and the movable plate; and a bag-collecting needle is provided on the needle mounting plate via an adjustment device.

[0007] A further improvement is that the adjustment device includes: a plurality of mounting through holes on the needle mounting plate that match the collecting needles, and a threaded hole on the needle mounting plate that communicates with the mounting through holes, wherein a screw that abuts against the collecting needle is threaded into the threaded hole.

[0008] A further improvement is that the feeding device includes: a first rotating shaft rotatably mounted on the frame, a second rotating shaft rotatably mounted on the frame, and several transmission chains that are drively connected to the first and second rotating shafts. Several feeding rods are provided between each pair of the transmission chains. The frame is provided with a feeding drive device for driving the first rotating shaft to rotate.

[0009] A further improvement is that a feeding shaft is rotatably mounted on the frame, and a plurality of feeding plates are mounted on the feeding shaft. The frame is also equipped with a feeding drive device for driving the feeding shaft to rotate and reset. After the feeding shaft rotates, the feeding plates abut against the side wall of the fixed plate to position the bag.

[0010] A further improvement is that the pressing device includes: two first guide seats respectively disposed on both sides of the frame, two first guide rods respectively slidably disposed in the two first guide seats, the pressure plate is disposed on the upper end of the first guide rod through a buffer device, the fixing plate is fixedly disposed on the first guide seat, and a pressing drive device is provided between the lower end of the first guide rod and the frame for driving the first guide rod to slide up and down.

[0011] A further improvement is that the buffer device includes: a limiting groove on the first guide rod, a limiting seat on the pressure plate that matches the limiting groove, a limiting screw on the upper end of the first guide rod, and a buffer spring sleeved on the first guide rod, with one end abutting against the limiting screw and the other end abutting against the limiting seat.

[0012] A further improvement is that the bag collecting needle is a cold bag collecting needle and / or a hot bag collecting needle.

[0013] A further improvement is that the downward pressure drive device includes: a power spindle rotatably mounted on the frame, an eccentric wheel mounted on the power spindle, an eccentric sleeve rotatably mounted on the eccentric wheel, a fine-tuning telescopic component mounted on the eccentric sleeve, a swing shaft rotatably mounted on the frame, a short swing rod whose one end is rotatably connected to the telescopic rod of the fine-tuning telescopic component and whose other end is fixedly connected to the swing shaft, a long swing rod fixedly mounted on the swing shaft, and a connecting rod whose one end is rotatably connected to the long swing rod and whose other end is rotatably connected to the first guide rod. The power spindle is provided with a synchronous wheel, and the frame is provided with a first rotary drive component for driving the synchronous wheel to rotate.

[0014] A further improvement is that the feeding drive device includes a feeding chain, and the first rotating shaft is connected to the power main shaft via the feeding chain drive.

[0015] A further improvement is that the material handling drive device includes: a linkage shaft rotatably mounted on the frame, a first linkage plate fixedly mounted on the linkage shaft, a second linkage plate fixedly mounted on the material handling shaft, and linkage rods rotatably connected to the first linkage plate and the second linkage plate respectively. The linkage shaft and the first rotating shaft are connected by a material handling chain drive.

[0016] The advantages and beneficial effects of this utility model are as follows: With a simple structure, this bag collecting device drives the bag collecting needle to rise and fall through the needle bag device, enabling the same equipment to use both needle-based and needleless bag collecting modes. When a needle hole is needed, the bag collecting needle passes through the bag that is pressed and positioned by the pressure plate, directly forming a functional hole during the bag collecting process, eliminating the need for a separate punching process. When a needle hole is not needed, the bag collecting needle retracts, and the pressure plate and the bag pressing telescopic component work together to press the bag, achieving needleless bag collecting and preventing the bag from being punctured. At the same time, in needleless mode, the material handling plate can stop and limit short bags that are prone to slipping after feeding. After the bag pressing telescopic component retracts, the pressure plate pressing surface remains flat, ensuring stable bag stacking and smooth entry of the next bag. This effectively solves the problem of existing bag collecting devices having a single function and being unable to handle both needle-based and needleless bag types, improving the adaptability of the equipment and production efficiency. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of a bag-pressing device for a bag-making machine according to the present invention; Figure 2 This is a three-dimensional schematic diagram of the needle bag device and pressure plate part of the bag pressing device of the bag making machine according to the present invention; Figure 3 This is a three-dimensional schematic diagram of the various driving devices of the bag pressing device of a bag making machine according to the present invention. Figure 1 ; Figure 4 This is a three-dimensional schematic diagram of the various driving devices of the bag pressing device of a bag making machine according to this utility model. Figure 2 ; Figure 5 This is a schematic diagram of a bag-pressing device for a bag-making machine without a frame, according to the present invention. In the diagram: 1. Frame; 2. Fixed plate; 3. Bag collecting needle; 4. First needle hole; 5. Pressure plate; 6. Second needle hole; 7. Bag pressing telescopic component; 8. Buffer ring; 9. Receiving groove; 10. Second guide rod; 11. Fixed mounting plate; 12. Needle adjusting telescopic component; 13. Movable plate; 14. Second guide seat; 15. Needle mounting plate; 16. Elevating bracket; 17. Mounting through hole; 18. Threaded hole; 19. First rotating shaft; 20. Second rotating shaft; 21. Drive chain; 22. Feeding rod; 23. Processing... 24. Material feeding shaft; 25. Material feeding plate; 26. First guide seat; 27. First guide rod; 28. Limiting groove; 29. ​​Limiting seat; 30. Limiting screw; 31. Buffer spring; 32. Folding plate; 33. Power spindle; 34. Eccentric wheel; 35. Eccentric sleeve; 36. Fine-tuning telescopic component; 37. Swinging shaft; 38. Short swing rod; 39. Long swing rod; 40. Connecting rod; 41. Synchronous pulley; 42. Feeding chain; 43. Linkage shaft; 44. First linkage plate; 45. Second linkage plate; 46. Linkage rod. Detailed Implementation

[0018] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings and examples. The following examples are only used to more clearly illustrate the technical solution of this utility model and should not be construed as limiting the scope of protection of this utility model.

[0019] like Figures 1-5 As shown, a bag-pressing device for a bag-making machine includes a frame 1, a fixed plate 2 on the frame 1 for placing bags, and a feeding device on the frame 1 located at the feeding end of the fixed plate 2 for bending the bags to prevent them from being blown away. It also includes: a plurality of bag-collecting needles 3 mounted on the frame 1 and located below the fixed plate 2 via a needle-bag device; a plurality of first needle holes 4 on the fixed plate 2 for the bag-collecting needles 3 to pass through; a pressure plate 5 mounted on the frame 1 and located above the fixed plate 2 via a pressing device; and a plurality of second needle holes 6 on the pressure plate 5 for the bag-collecting needles 3 to pass through. The pressure plate 5 is also provided with a plurality of bag-pressing telescopic components 7 for pressing the bags. The telescopic rods of the bag-pressing telescopic components 7 pass through the pressure plate 5 to press the bags. After the telescopic rods of the bag-pressing telescopic components 7 are retracted, the lower surface of the pressure plate 5 is flat. The bag-pressing telescopic component 7 is a telescopic air cylinder, a telescopic electric cylinder, or a telescopic hydraulic cylinder; The bag collecting device can both create needle holes when needed through the bag collecting needle 3 and avoid puncturing the bag body when needle holes are not needed, while ensuring the stability of bag pressing and stacking.

[0020] Furthermore, as an optional implementation, in order to ensure that the bag-pressing telescopic component 7 makes flexible contact with the bag body through the buffer ring 8 when it extends to press the bag, thus avoiding direct hard pressure on the bag body by the end of the telescopic rod and causing crushing or indentation, and at the same time to keep the pressing surface of the pressing plate 5 flat after the bag-pressing telescopic component 7 retracts, so as to avoid the buffer ring 8 protruding and interfering with the pressing plate 5 and the bag-collecting needle 3 in pressing the bag, or affecting the entry and stacking of the next bag, the telescopic rod of the bag-pressing telescopic component 7 is connected to the buffer ring 8, and the pressing plate 5 is provided with a receiving groove 9, which is used to receive the buffer ring 8 to ensure that the lower surface of the pressing plate 5 is flat.

[0021] Furthermore, as an optional implementation, in order to drive the collecting needle 3 to rise and fall as needed, so that the collecting needle 3 can selectively pass through the first needle hole 4 on the fixed plate 2, thereby realizing needle-containing or needle-free collecting, the needle bag device includes: a plurality of second guide rods 10 disposed at the bottom of the fixed plate 2, a fixed mounting plate 11 disposed between each pair of the second guide rods 10, a needle adjusting telescopic component 12 disposed on the fixed mounting plate 11, a movable plate 13 disposed on the telescopic rod of the needle adjusting telescopic component 12, a second guide seat 14 disposed on the movable plate 13 that cooperates with the second guide rods 10, a needle mounting plate 15 disposed on the movable plate 13, a heightening bracket 16 disposed between the needle mounting plate 15 and the movable plate 13, and a collecting needle 3 disposed on the needle mounting plate 15 through an adjustment device; The needle adjustment telescopic component 12 is a telescopic cylinder, a telescopic electric cylinder, or a telescopic hydraulic cylinder.

[0022] Furthermore, as an optional implementation, in order to facilitate the adjustment of the installation position, spacing and number of the bag collecting needles 3 to adapt to the position and number of functional holes required for different bag types, the adjustment device includes: a plurality of mounting through holes 17 on the needle mounting plate 15 that match the bag collecting needles 3, and a threaded hole 18 on the needle mounting plate 15 that communicates with the mounting through holes 17, wherein a screw that abuts against the bag collecting needles 3 is internally threaded into the threaded hole 18.

[0023] Furthermore, as an optional implementation, in order to bend the bag at the feeding end to prevent the bag from being blown away by the airflow and to avoid the bag from tilting or protruding and colliding with the bags subsequently conveyed, the feeding device includes: a first rotating shaft 19 rotatably mounted on the frame 1, a second rotating shaft 20 rotatably mounted on the frame 1, and a plurality of transmission chains 21 that are drively connected to the first rotating shaft 19 and the second rotating shaft 20. A plurality of feeding rods 22 are provided between each pair of transmission chains 21. The frame 1 is provided with a feeding drive device for driving the first rotating shaft 19 to rotate.

[0024] Furthermore, as an optional implementation, in order to block and limit the short bags that are prone to slipping downwards after being punched in the needle-free bag collection mode, and to prevent the short bags from slipping off the fixed plate 2, the frame 1 is rotatably provided with a feeding shaft 23, the feeding shaft 23 is provided with a plurality of feeding plates 24, and the frame 1 is also provided with a feeding drive device for driving the feeding shaft 23 to rotate and reset. After the feeding shaft 23 rotates, the feeding plates 24 abut against the side wall of the fixed plate 2 to position the bags.

[0025] Furthermore, as an optional implementation, in order to drive the pressure plate 5 to press down first and press and position the bag on the fixed plate 2, so that the bag collecting needle 3 can pass through the pressed bag and cooperate with the bag pressing telescopic component 7 to press the bag in the needleless bag collecting mode, the pressing device includes: two first guide seats 25 respectively disposed on both sides of the frame 1, and two first guide rods 26 respectively slidably disposed in the two first guide seats 25. The pressure plate 5 is disposed on the upper end of the first guide rods 26 through a buffer device. The fixed plate 2 is fixedly disposed on the first guide seats 25. A pressing drive device is provided between the lower end of the first guide rods 26 and the frame 1 for driving the first guide rods 26 to slide up and down.

[0026] Furthermore, as an optional implementation, in order to provide cushioning when the pressure plate 5 is pressed down and to avoid rigid collision between the pressure plate 5 and the fixing plate 2 or the bag, the cushioning device includes: a limiting groove 27 provided on the first guide rod 26, a limiting seat 28 provided on the pressure plate 5 that matches the limiting groove 27, a limiting screw 29 provided at the upper end of the first guide rod 26, and a cushioning spring 30 sleeved on the first guide rod 26, with one end abutting against the limiting screw 29 and the other end abutting against the limiting seat 28.

[0027] Furthermore, as an optional implementation, in order to select cold needle or hot needle according to the bag material and hole requirements to meet the functional hole forming requirements of different bag types, the bag collecting needle 3 is a cold bag collecting needle 3 and / or a hot bag collecting needle 3.

[0028] Furthermore, as an optional implementation, in order to improve the stability of use, the bottom of the fixing plate 2 is provided with a folding plate 31 near the bag feeding device to prevent the bag from contacting the collecting needle 3.

[0029] Furthermore, as an optional implementation, in order to convert the rotational motion of the power spindle 32 into the up-and-down sliding motion of the first guide rod 26, thereby driving the pressure plate 5 to press down on the positioning bag so that the bag collecting needle 3 can pass through the pressed bag, and the pressing position or stroke of the pressure plate 5 can be adjusted by the fine-tuning telescopic member 35, the pressing drive device includes: a power spindle 32 rotatably mounted on the frame 1, an eccentric wheel 33 mounted on the power spindle 32, an eccentric sleeve 34 rotatably mounted on the eccentric wheel 33, and a micro-adjustment mechanism 35 mounted on the eccentric sleeve 34. The frame 1 includes a telescopic adjustment component 35, a swing shaft 36 rotatably mounted on the frame 1, a short swing rod 37 with one end rotatably connected to the telescopic rod of the telescopic adjustment component 35 and the other end fixedly connected to the swing shaft 36, a long swing rod 38 fixedly mounted on the swing shaft 36, and a connecting rod 39 with one end rotatably connected to the long swing rod 38 and the other end rotatably connected to the first guide rod 26. The power spindle 32 is provided with a synchronous pulley 40, and the frame 1 is provided with a first rotary drive component for driving the synchronous pulley 40 to rotate. The first rotary drive component is a servo motor. The fine-tuning telescopic component 35 is a telescopic cylinder, a telescopic electric cylinder, or a telescopic hydraulic cylinder.

[0030] Furthermore, as an optional implementation, in order to use the power spindle 32 to synchronously drive the feeding device and coordinate the feeding and bending action with the bag pressing and bag collecting actions, the feeding drive device includes: a feeding chain 43, and the first rotating shaft 19 is connected to the power spindle 32 through the feeding chain 43. To reduce the difficulty of debugging the bag making machine, the first rotating shaft 19 can be directly connected to a second rotating drive component, which is a servo motor.

[0031] Furthermore, as an optional implementation, in order to synchronously drive the material handling shaft 23 to rotate and reset using the first rotating shaft 19, so that the material handling plate 24 can promptly form a material blocking limit for the short bag in the needleless bag collection mode, and coordinate with the feeding and bag collection actions, the material handling drive device includes: a linkage shaft 44 rotatably mounted on the frame 1, a first linkage plate 45 fixedly mounted on the linkage shaft 44, a second linkage plate 46 fixedly mounted on the material handling shaft 23, and a linkage rod 47 rotatably connected to the first linkage plate 45 and the second linkage plate 46 respectively. The linkage shaft 44 and the first rotating shaft 19 are connected by a material handling chain (not shown in the figure). Furthermore, to reduce the difficulty of debugging the bag making machine, the linkage shaft 44 can be directly connected to a third rotary drive component, which is a servo motor.

[0032] Working principle: When collecting bags with needles, after the bag making machine completes bag forming, heat sealing and cutting, the bag making machine's own conveying mechanism sends the first bag to the fixed plate 2. The feeding device operates at the feeding end of the fixed plate 2 to bend the bag. On the one hand, it prevents the bag from being blown away by the airflow, and on the other hand, it makes the bag stick to the fixed plate 2 to avoid the bag from sticking up or protruding and colliding with the bags that are subsequently conveyed. After the first bag is in place, the pressing device drives the pressing plate 5 to descend. The pressing plate 5 presses and positions the first bag on the fixed plate 2 with a flat pressing surface. At this time, the pressing and telescopic component 7 does not work. Its telescopic rod and buffer ring 8 are stored in the receiving groove 9 on the pressing plate 5 to ensure that the pressing surface of the pressing plate 5 is flat. After the first bag is pressed down by the pressure plate 5, the needle adjustment telescopic component 12 in the needle bag device drives the movable plate 13 to move upward. The movable plate 13 drives the collecting needle 3 to rise through the needle mounting plate 15. The collecting needle 3 passes through the first needle hole 4 on the fixed plate 2, pierces the first bag pressed down by the pressure plate 5, and passes through the second needle hole 6 on the pressure plate 5, forming the required needle hole on the bag body. Since the first bag has been pressed and positioned by the pressure plate 5, the collecting needle 3 can pass through the bag smoothly without causing the bag to shift or lift up. After the pressure plate 5 is raised, the first bag is threaded onto the bag collecting needle 3 and remains on the fixed plate 2. The second bag is conveyed to the fixed plate 2 and stacked on top of the first bag. The pressure plate 5 descends again to press and position the second bag. The bag collecting needle 3 continues to rise and passes through the second bag. This process is repeated. Subsequent bags are threaded onto the bag collecting needle 3 and stacked into a pile. After the bags are collected, the bag collecting needle 3 retracts below the fixed plate 2, the pressure plate 5 rises, and the bags are neatly stacked. When collecting bags without needles, the collecting needle 3 is pulled back below the fixing plate 2 by the needle bag device and does not pass through the first needle hole 4, so no needle hole will be formed on the bag; The first bag is conveyed to the fixed plate 2. The feeding device bends the bag to prevent it from being blown away by the airflow and to make it lie flat on the fixed plate 2, so as to avoid the bag from sticking up or sticking out and colliding with the bags conveyed later. The pressure plate 5 descends and the bag pressing telescopic component 7 extends from the pressure plate 5 to press the first bag tightly on the fixed plate 2. The needle-free bag collection is achieved by the cooperation of the pressure plate 5 and the bag pressing telescopic component 7. Then the bag pressing telescopic component 7 retracts and its telescopic rod and buffer ring 8 enter the receiving groove 9 on the pressure plate 5, so that the bag pressing surface of the pressure plate 5 returns to flat. After the pressure plate 5 is lifted, the first bag remains on the fixed plate 2. For short bags, since there is no bag collecting needle 3 to position them, they are prone to slipping down after feeding due to imbalance. At this time, the feeding drive device drives the feeding shaft 23 to rotate, so that the feeding plate 24 abuts against the side wall of the fixed plate 2, forming a blocking limit on the short bag and preventing it from slipping down. The second bag is conveyed to the fixed plate 2 and stacked on top of the first bag. The pressure plate 5 descends again, and the bag-pressing telescopic component 7 extends to press the two bags together on the fixed plate 2. After the bag-pressing telescopic component 7 retracts, the bag-pressing surface of the pressure plate 5 returns to flatness. The pressure plate 5 is then lifted to enter the next cycle. This process is repeated, and the bags are stacked into a pile in sequence.

[0033] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0034] The embodiments described above are merely illustrative of several implementations of this utility model. While the descriptions are specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

[0035] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A bag-pressing device for a bag-making machine, comprising a frame, a fixing plate mounted on the frame for placing bags, and a feeding device mounted on the frame at the feeding end of the fixing plate for bending the bags to prevent them from being blown away, characterized in that: Also includes: The device consists of several bag-collecting needles mounted on the frame and located below the fixed plate, several first needle holes on the fixed plate for the bag-collecting needles to pass through, a pressure plate mounted on the frame and located above the fixed plate via a pressing device, and several second needle holes on the pressure plate for the bag-collecting needles to pass through. The pressure plate is also provided with several bag-pressing telescopic components for pressing the bag. The telescopic rods of the bag-pressing telescopic components pass through the pressure plate to press the bag. After the telescopic rods of the bag-pressing telescopic components are retracted, the lower surface of the pressure plate is flat. The needle bag device includes: a plurality of second guide rods disposed at the bottom of a fixed plate, a fixed mounting plate disposed between each pair of the second guide rods, a needle adjusting telescopic component disposed on the fixed mounting plate, a movable plate disposed on the telescopic rod of the needle adjusting telescopic component, a second guide seat disposed on the movable plate that cooperates with the second guide rods, a needle mounting plate disposed on the movable plate, a heightening bracket disposed between the needle mounting plate and the movable plate, and a bag collecting needle disposed on the needle mounting plate by means of an adjustment device.

2. The bag-pressing device for a bag-making machine according to claim 1, characterized in that: The telescopic rod of the pressure bag telescopic component is connected to a buffer ring, and the pressure plate is provided with a receiving groove for accommodating the buffer ring to ensure that the lower surface of the pressure plate is flat.

3. The bag-pressing device for a bag-making machine according to claim 1, characterized in that: The adjustment device includes: a plurality of mounting through holes on the needle mounting plate that match the collecting needles, and a threaded hole on the needle mounting plate that communicates with the mounting through holes, wherein a screw that abuts against the collecting needle is threaded into the threaded hole.

4. The bag-pressing device for a bag-making machine according to claim 1, characterized in that: The feeding device includes: a first rotating shaft rotatably mounted on a frame, a second rotating shaft rotatably mounted on a frame, and several transmission chains that are drively connected to the first rotating shaft and the second rotating shaft. Several feeding rods are provided between each pair of the transmission chains. The frame is provided with a feeding drive device for driving the first rotating shaft to rotate.

5. The bag-pressing device for a bag-making machine according to claim 1, characterized in that: The frame is rotatably equipped with a feeding shaft, and the feeding shaft is equipped with a plurality of feeding plates. The frame is also equipped with a feeding drive device for driving the feeding shaft to rotate and reset. After the feeding shaft rotates, the feeding plates abut against the side wall of the fixed plate to position the bag.

6. The bag-pressing device for a bag-making machine according to claim 1, characterized in that: The pressing device includes: two first guide seats respectively disposed on both sides of the frame, two first guide rods respectively slidably disposed in the two first guide seats, a pressure plate disposed on the upper end of the first guide rods through a buffer device, a fixing plate fixedly disposed on the first guide seats, and a pressing drive device disposed between the lower end of the first guide rods and the frame for driving the first guide rods to slide up and down.

7. The bag-pressing device for a bag-making machine according to claim 6, characterized in that: The buffer device includes: a limiting groove on the first guide rod, a limiting seat on the pressure plate that matches the limiting groove, a limiting screw on the upper end of the first guide rod, and a buffer spring sleeved on the first guide rod, with one end abutting against the limiting screw and the other end abutting against the limiting seat.

8. The bag-pressing device for a bag-making machine according to claim 1, characterized in that: The collecting needle is a cold collecting needle and / or a hot collecting needle.

9. A bag-pressing device for a bag-making machine according to claim 6, characterized in that: The downward pressure drive device includes: a power spindle rotatably mounted on a frame, an eccentric wheel mounted on the power spindle, an eccentric sleeve rotatably mounted on the eccentric wheel, a fine-tuning telescopic component mounted on the eccentric sleeve, a swing shaft rotatably mounted on the frame, a short swing rod whose one end is rotatably connected to the telescopic rod of the fine-tuning telescopic component and whose other end is fixedly connected to the swing shaft, a long swing rod fixedly mounted on the swing shaft, and a connecting rod whose one end is rotatably connected to the long swing rod and whose other end is rotatably connected to the first guide rod. The power spindle is provided with a synchronous wheel, and the frame is provided with a first rotary drive component for driving the synchronous wheel to rotate.

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