A bag making machine for making plastic bags

Abstract

The application discloses a bag making machine for preparing plastic bags, which comprises two pressing mechanisms arranged above conveying rollers and sliding towards each other, and the pressing mechanism comprises a supporting cylinder and a sliding rod sliding up and down through the supporting cylinder. A positioning cylinder for pressing the plastic bag is rotatably arranged below the sliding rod, and a rotating rod is arranged in the positioning cylinder along the axis of the positioning cylinder. A blowing blade is fixedly connected between the rotating rod and the positioning cylinder. The lower end of the sliding rod is fixedly connected with a mounting frame, and the rotating rod is rotatably arranged on the mounting frame. The mounting frame, the rotating rod, the blowing blade and the positioning cylinder form a stable gravity as the pressing force for the plastic bag, so that the limiting pressing force on the plastic bag is stable and consistent. The blowing blade is arranged in the rotating positioning cylinder, and blows air to the plastic bag when the positioning cylinder rotates, so as to blow away the dust and heat adhered to the upper surface of the plastic bag, and the dust removing and heat reducing effects are achieved.

Description

Technical Field

[0001] This invention relates to the field of bag-making machine technology, specifically to a bag-making machine for producing plastic bags. Background Technology

[0002] Plastic bags are bags made primarily of plastic (common plastics include polypropylene, polyester, and nylon). They are essential items in daily life and are commonly used to hold other items. They are widely used due to their low cost, light weight, large capacity, and ease of storage. A plastic bag-making machine mainly consists of: a material storage device, a stepping device, a frequency converter, a bag-forming device, a heat-sealing cutter, and a control device. Its main features include: a material storage device that stores a certain amount of raw material; a stepping device that moves the material; a frequency converter that drives the heat-sealing cutter; a bag-forming device that forms bags after producing a fixed number; and a heat-sealing cutter that uses a temperature controller to seal and cut the material. The control device coordinates all these actions.

[0003] In the prior art, a dustproof mechanism for a plastic bag making machine, with publication number "CN218519299U", includes a base plate, casters, a first load-bearing plate, a placement roller, a first motor, a winding roller, an adjustment mechanism for conveying the plastic bags, and a dust-absorbing mechanism for absorbing dust from the plastic bags. Four casters are located below the base plate, and four first load-bearing plates are symmetrically arranged on both sides above the base plate. The beneficial effect is that by incorporating a guide roller, a threaded rod, and a pressure roller, rotating the handle at the rear end of the threaded rod causes it to rotate. The opposite thread directions at the front and rear ends of the threaded rod drive the sliding frames on both sides to slide back and forth along the fixed frame, thus adapting to plastic bags of different widths. The sliding plates and compression springs can be configured to control the pressure roller below to relatively fix and clamp the plastic bag according to its thickness.

[0004] However, existing technologies still have significant drawbacks. For example, in existing technologies, the pressure roller is pressed onto plastic bags of different thicknesses by using a sliding plate and a compression spring. However, the thicker the plastic bag, the greater the elastic compression deformation of the compression spring, resulting in a greater squeezing force exerted by the pressure roller on the plastic bag and a greater friction between the pressure roller and the plastic bag. Therefore, when the plastic bag is thick, the pressure roller may press against the edge of the plastic bag, preventing it from moving and causing the edge of the plastic bag to tear. Furthermore, the aforementioned technologies use negative pressure adsorption to remove dust, which requires sufficient negative pressure suction to be applied to the surface of the plastic bag to remove the dust. Therefore, negative pressure adsorption dust removal requires more energy. Summary of the Invention

[0005] The purpose of this invention is to provide a bag-making machine for producing plastic bags, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A bag-making machine for producing plastic bags includes a conveyor roller for conveying plastic bags. Two pressing mechanisms are slidably arranged above the conveyor roller, and the sliding direction of the pressing mechanisms is parallel to the axial direction of the conveyor roller. Each pressing mechanism includes a support cylinder and a sliding rod that slides vertically through the support cylinder. An electromagnet and a magnetic plate are respectively installed on the support cylinder and the sliding rod. The sliding rod is suspended under magnetic cooperation. A positioning roller that cooperates to squeeze the plastic bag is rotatably arranged below the sliding rod. A rotating rod is arranged along the axis of the positioning roller. A blower blade is fixedly connected between the rotating rod and the positioning roller. The plastic bag drives the positioning roller to move, causing the blower blade to blow air towards the adjacent pressing mechanism.

[0008] The lower end of the sliding rod is fixedly connected to the mounting bracket, and the rotating rod is rotatably mounted on the mounting bracket. A refrigeration box containing heat exchange fluid is fixedly connected to the mounting bracket. The refrigeration end slides downward and is inserted into the refrigeration box. The refrigeration unit is fixedly connected to the support cylinder through the refrigeration unit connecting rod. The heat exchange tube extending into the positioning roller is fixedly mounted on the refrigeration box and communicates with the refrigeration box. The blower blades and heat exchange tubes are arranged sequentially at intervals along the direction close to another pressing mechanism.

[0009] Preferably, the pressing mechanism further includes a sliding nut, and the sliding nut is fixedly connected to the support cylinder through a support cylinder connecting rod. The sliding nuts of the two pressing mechanisms are sleeved at both ends of the same bidirectional transmission screw, and the same guide rod parallel to the axial direction of the bidirectional transmission screw slides through the two sliding nuts. The bidirectional transmission screw is driven to rotate by a first rotary drive motor.

[0010] Preferably, mounting plates are fixedly provided at both ends of the bidirectional transmission screw, and the output end of the first rotary drive motor fixedly mounted on one mounting plate rotates through the mounting plate and is fixedly connected to one end of the bidirectional transmission screw. The other end of the bidirectional transmission screw is fixedly connected to a first fixed connecting rod that rotates through another mounting plate, and the end of the first fixed connecting rod away from the bidirectional transmission screw is fixedly connected to a first limiting baffle that movably abuts against the side wall of the mounting plate.

[0011] Preferably, the output end of a second rotary drive motor fixedly mounted on one of the mounting plates rotates through the mounting plate and is fixedly connected to one end of a transport roller, and the other end of the transport roller is fixedly connected to a second fixed connecting rod that rotates through another mounting plate, and the end of the second fixed connecting rod away from the transport roller is fixedly connected to a second limiting baffle that movably abuts against the side wall of the mounting plate.

[0012] Preferably, a sliding rod connecting plate is fixedly connected to the upper end of the sliding rod, and an electromagnet is fixedly installed on the upper end of the support cylinder, and a magnetic plate that is magnetically repelled by the electromagnet is fixedly installed on the lower end surface of the sliding rod connecting plate.

[0013] Preferably, the positioning roller is provided with a rotating cylinder whose axis coincides with the axis of the rotating rod, and the rotating rod extends into the rotating cylinder and is fixedly connected to the inner wall of the rotating cylinder by a rotating cylinder connecting rod. The outer wall of the rotating cylinder has a ring of gear teeth. A high-speed rotating rod with an axis parallel to the axis of the rotating cylinder and a diameter smaller than the diameter of the rotating cylinder is rotatably inserted into the positioning roller. The outer wall of the high-speed rotating rod is provided with gear teeth that mesh with the gear teeth on the outer wall of the rotating cylinder. Several high-speed blower fan blades are fixedly connected to the outside of the high-speed rotating rod, and the high-speed blower fan blades are located between the blower blades and the heat exchange tube.

[0014] Preferably, the refrigeration box is fixedly installed at one end of the positioning roller near the other pressing mechanism, and an air guide plate is fixedly installed at one end of the positioning roller near the other pressing mechanism. The air guide plate is located between the positioning roller and the refrigeration box, and the air guide plate is inclined downward along the direction near the other pressing mechanism.

[0015] Preferably, the heat exchange tube passes through the air duct and extends into the positioning sleeve, and the high-speed rotating rod extends out of the positioning sleeve and is rotatably mounted on the air duct.

[0016] Preferably, the air duct and the refrigeration box are fixedly connected by an air duct connecting plate.

[0017] Preferably, a plurality of heat exchange fins are fixedly connected to the outer wall of the heat exchange tube.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] The bag-making machine of the present invention uses the stable gravity formed by the mounting frame, rotating rod, blower blades and positioning roller as the extrusion force on the plastic bag. Compared with the method of using a compression spring to push the positioning roller to extrude the plastic bag, this avoids the problems of the positioning roller applying too little extrusion force due to the plastic bag being too thin, resulting in poor positioning effect and easy displacement of the plastic bag, or the positioning roller applying too much extrusion force due to the plastic bag being too thick, resulting in excessive force on the edge of the plastic bag and easy tearing and deformation. In addition, by setting blower blades inside the rotating positioning roller, the blower blades blow air onto the plastic bag when the positioning roller rotates, blowing away the dust and heat adhering to the surface of the plastic bag, achieving the effect of dust removal and cooling, without the need for additional energy consumption, thus achieving the effect of energy saving and emission reduction. Attached Figure Description

[0020] Figure 1 This is a front view schematic diagram of the transport roller and pressing mechanism of the present invention;

[0021] Figure 2 This is a front cross-sectional view of the transport roller and pressing mechanism of the present invention;

[0022] Figure 3 for Figure 2Enlarged schematic diagram of the intermediate pressure material mechanism;

[0023] Figure 4 for Figure 3 Enlarged schematic diagram of the internal mechanism of the center positioning roller;

[0024] Figure 5 This is a schematic diagram of the pressing mechanism of the present invention positioning a wide and thin plastic bag;

[0025] Figure 6 This is a schematic diagram of the pressing mechanism of the present invention positioning a narrow and thick plastic bag.

[0026] In the diagram: 1. Transport roller, 2. Support cylinder, 3. Sliding rod, 4. Electromagnet, 5. Magnetic plate, 6. Mounting bracket, 7. Positioning roller, 8. Rotating rod, 9. Blower blade, 10. Refrigeration box, 11. Refrigerator, 12. Refrigerator connecting rod, 13. Heat exchange tube, 131. Heat exchange fins, 14. Bidirectional transmission screw, 15. First rotary drive motor, 16. Sliding nut, 17. Support cylinder connecting rod, 161. Guide rod, 18. Mounting plate, 19. First fixed connecting rod, 191. First limit baffle, 20. Second rotary drive motor, 21. Second fixed connecting rod, 211. Second limit baffle, 22. Sliding rod connecting plate, 23. Rotating cylinder, 24. Rotating cylinder connecting rod, 25. High-speed rotating rod, 26. High-speed blower fan blade, 27. Air duct, 28. Air duct connecting plate, 29. Plastic bag. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] Please see Figure 1-6 The present invention provides a technical solution:

[0029] Example 1:

[0030] A bag-making machine for producing plastic bags includes a transport roller 1 for conveying plastic bags 29. The transport roller 1, which rotates under the drive of a second rotary drive motor 20, is horizontally arranged in a left-right direction. The produced plastic bags 29 pass over the transport roller 1. The transport roller 1 conveys the plastic bags 29 through sliding friction. Two pressing mechanisms are slidably arranged facing each other above the transport roller 1. The two pressing mechanisms press against the two edges of the plastic bags 29 to limit the movement of the plastic bags 29 and prevent the plastic bags 29 from deviating during the transport process. The sliding direction of the pressing mechanisms is parallel to the axial direction of the transport roller 1, that is, the two pressing mechanisms are both slidably arranged in a left-right direction. For plastic bags 29 of different widths, the distance between the two pressing mechanisms is changed by moving the two pressing mechanisms, so that the pressing mechanisms can move adaptively according to the plastic bags 29 of different widths, thereby improving the application range of the pressing mechanisms.

[0031] The pressing mechanism includes a support cylinder 2 and a sliding rod 3 that slides vertically through the support cylinder 2. An electromagnet 4 and a magnetic plate 5 are respectively installed on the support cylinder 2 and the sliding rod 3. The sliding rod 3 is suspended under magnetic cooperation. A positioning roller 7 is rotatably arranged below the sliding rod 3 to cooperate in squeezing the plastic bag 29. A rotating rod 8 is arranged along the axis of the positioning roller 7. A blower blade 9 is fixedly connected between the rotating rod 8 and the positioning roller 7. A mounting bracket 6 is fixedly connected to the lower end of the sliding rod 3. The rotating rod 8 is rotatably mounted on the mounting bracket 6. Specifically, the mounting bracket 6 extends to the end of the positioning roller 7 away from the other pressing mechanism. At this location, the rotating rod 8 rotates through the mounting frame 6, and two baffles are fixedly connected to the rotating rod 8 and clamped on the left and right sides of the mounting frame 6, so that the rotating rod 8 is rotated and mounted on the mounting frame 6. When the plastic bag 29 does not need to be squeezed, the electromagnet 4 is energized and the magnetic cooperation between the electromagnet 4 and the magnetic plate 5 makes the sliding rod 3 overcome its own weight and suspend. The sliding rod 3 drives the mounting frame 6, the rotating rod 8, the blower blade 9 and the positioning roller 7 to maintain a suspended state together. The positioning roller 7 is located above the transport roller 1 and leaves a gap between it and the transport roller 1, so that the plastic bag 29 can be placed on the transport roller 1.

[0032] After the plastic bag 29 is placed on the transport roller 1, the electromagnet 4 is turned off. The entire assembly consisting of the sliding rod 3, mounting bracket 6, rotating rod 8, blower blade 9, and positioning roller 7 is no longer suspended and moves downwards under its own gravity. This causes the positioning roller 7 to press against the plastic bag 29, applying a stable compressive force. The compressive force applied by the positioning roller 7 is the weight of the sliding rod 3, mounting bracket 6, rotating rod 8, blower blade 9, and positioning roller 7. This allows the positioning roller 7 to apply a consistent compressive force to plastic bags 29 of different thicknesses. Compared to using a compression spring to push the positioning roller 7 to compress the plastic bag 29, this avoids the plastic bag 29 being too thick... The plastic bag 29 is too thin, resulting in insufficient pressure applied by the positioning roller 7, which leads to poor positioning and easy displacement. Alternatively, the plastic bag 29 is too thick, resulting in excessive pressure applied by the positioning roller 7, which leads to excessive stress on the edges of the plastic bag 29 and easy tearing and deformation. In addition, during the transportation of the plastic bag 29, the plastic bag 29 drives the positioning roller 7 to rotate in one direction. The rotation of the positioning roller 7 drives the blower blades 9 to rotate together, causing the blower blades 9 to blow air towards the adjacent pressing mechanism. The blower air blown by the blower blades 9 blows away the dust and heat adhering to the upper surface of the plastic bag 29, achieving the effect of dust removal and cooling without the need for additional energy consumption, thus achieving the effect of energy saving and emission reduction.

[0033] Furthermore, a rotating cylinder 23 with its axis coinciding with that of the rotating rod 8 is installed inside the positioning roller 7. The rotating rod 8 extends into the rotating cylinder 23 and is fixedly connected to the inner wall of the rotating cylinder 23 by a rotating cylinder connecting rod 24. The outer wall of the rotating cylinder 23 has a ring of gear teeth. A high-speed rotating rod 25 with its axis parallel to that of the rotating cylinder 23 and a diameter smaller than that of the rotating cylinder 23 is rotatably inserted into the positioning roller 7. The outer wall of the high-speed rotating rod 25 has gear teeth that mesh with the gear teeth on the outer wall of the rotating cylinder 23. Several high-speed blower fan blades 26 are fixedly connected to the outside of the high-speed rotating rod 25. 8 rotates and drives the rotating cylinder 23 to rotate together through the rotating cylinder connecting rod 24. The rotating cylinder 23 drives the high-speed rotating rod 25 to rotate together through the meshing connection between the gear teeth. By setting the diameter of the high-speed rotating rod 25 to be smaller than the diameter of the rotating cylinder 23, the rotational angular velocity of the high-speed rotating rod 25 is increased compared to the rotating rod 8. This makes the high-speed blower fan blade 26 have a larger rotational angular velocity and rotational linear velocity. The high-speed blower fan blade 26 rotates at high speed to blow more air into the adjacent pressing mechanism, thereby improving the dust removal and cooling effect of the blower on the surface of the plastic bag 29.

[0034] Furthermore, an air guide plate 27 is fixedly installed at one end of the positioning roller 7 near another pressing mechanism, and the air guide plate 27 is inclined downward along the direction of the other pressing mechanism, so that the blower air sprayed from the positioning roller 7 flows downward under the guidance of the air guide plate 27, thereby improving the dust removal and cooling effect of the blower air on the plastic bag 29.

[0035] As one embodiment, the pressing mechanism also includes a sliding nut 16, and the sliding nut 16 is fixedly connected to the support cylinder 2 through the support cylinder connecting rod 17. The sliding nuts 16 of the two pressing mechanisms are sleeved at both ends of the same bidirectional transmission screw 14. The bidirectional transmission screw 14 located above the conveying roller 1 is also horizontally arranged in the left-right direction. The same guide rod 161 parallel to the axial direction of the bidirectional transmission screw 14 slides through the two sliding nuts 16. The guide rod 161 fixedly arranged above the bidirectional transmission screw 14 is also horizontally arranged in the left-right direction. Thus, the sliding nut 16 cannot rotate with the bidirectional transmission screw 14 through the arrangement of the guide rod 161, so that the sliding nut 16 can only slide in the left-right direction when the bidirectional transmission screw 14 rotates. The bidirectional transmission screw 14 is driven to rotate by the first rotary drive motor 15, and the first rotary drive motor 15 is a bidirectional rotary motor.

[0036] When the plastic bag 29 is wide, the first rotary drive motor 15 drives the bidirectional transmission screw 14 to rotate in the forward direction, causing the two sliding nuts 16 to move away from each other. The sliding nuts 16 drive the support cylinder 2 and the positioning roller 7 to slide together through the support cylinder connecting rod 17, thereby causing the positioning rollers 7 on the two pressing mechanisms to move away from each other to accommodate the wide plastic bag 29. Similarly, when the plastic bag 29 is narrow, the first rotary drive motor 15 drives the bidirectional transmission screw 14 to rotate in the reverse direction, causing the two sliding nuts 16 to move closer to each other. The sliding nuts 16 drive the support cylinder 2 and the positioning roller 7 to slide together through the support cylinder connecting rod 17, thereby causing the positioning rollers 7 on the two pressing mechanisms to move closer to each other to accommodate the narrow plastic bag 29.

[0037] Mounting plates 18 are fixedly installed at both ends of the bidirectional transmission screw 14. A guide rod 161 is fixedly connected between the two mounting plates 18. The output end of the first rotary drive motor 15, which is fixedly installed on one mounting plate 18, rotates through the mounting plate 18 and is fixedly connected to one end of the bidirectional transmission screw 14. This allows the first rotary drive motor 15 to drive the bidirectional transmission screw 14 to rotate in the forward or reverse direction. The other end of the bidirectional transmission screw 14 is fixedly connected to a first fixed connecting rod 19 that rotates through the other mounting plate 18. The end of the first fixed connecting rod 19 away from the bidirectional transmission screw 14 is fixedly connected to a first limiting baffle 191 that movably abuts against the side wall of the mounting plate 18. The cooperation between the first fixed connecting rod 19 and the first limiting baffle 191 provides support and limitation for the bidirectional transmission screw 14, improving the stability of the bidirectional transmission screw 14 during operation.

[0038] A second rotary drive motor 20, fixedly mounted on a mounting plate 18, rotates through the mounting plate 18 and is fixedly connected to one end of a conveyor roller 1, thereby causing the second rotary drive motor 20 to drive the conveyor roller 1 to rotate. The conveyor roller 1 then conveys the plastic bag 29 through friction. The other end of the conveyor roller 1 is fixedly connected to a second fixed connecting rod 21 that rotates through another mounting plate 18. The end of the second fixed connecting rod 21 away from the conveyor roller 1 is fixedly connected to a second limiting baffle 211 that movably abuts against the side wall of the mounting plate 18. The cooperation between the second fixed connecting rod 21 and the second limiting baffle 211 provides support and limitation for the conveyor roller 1, improving the stability of the conveyor roller 1 during operation.

[0039] In one embodiment, a sliding rod connecting plate 22 is fixedly connected to the upper end of the sliding rod 3, and an electromagnet 4 is fixedly installed on the upper end of the support cylinder 2. A magnetic plate 5, which is magnetically repulsive to the electromagnet 4, is fixedly installed on the lower end surface of the sliding rod connecting plate 22. This allows the sliding rod 3 to be in a suspended state by using the magnetic repulsive force between the electromagnet 4 and the magnetic plate 5 when the electromagnet 4 is energized.

[0040] Example 2:

[0041] Example 2 adds a mechanism to enhance the cooling of the plastic bag 29 based on Example 1. Specifically, a refrigeration box 10 containing heat exchange fluid is fixedly connected to the mounting frame 6. A refrigeration unit 11, with its cooling end sliding downward and inserted into the refrigeration box 10, is fixedly connected to the support cylinder 2 via a refrigeration unit connecting rod 12. A heat exchange tube 13, extending into the positioning roller 7, is fixedly installed on the refrigeration box 10 and communicates with it. Several heat exchange fins for enhanced heat exchange are fixedly connected to the outer wall of the heat exchange tube 13. Blower blades 9 and heat exchange tubes 13 are arranged sequentially at intervals along the direction close to another pressing mechanism. The refrigeration unit 11 can be a semiconductor structure for semiconductor refrigeration. The cooling end of the refrigeration unit 11 is inserted into the refrigeration box 10 to cool the heat exchange fluid, thereby enabling the heat exchange fluid in the heat exchange tube 13 to also have cooling capacity. The blower blades 9 blow air onto the heat exchange tube 13 and absorb the cooling capacity to form cold air, which is then blown onto the plastic bag 29 to improve the cooling effect on the plastic bag 29.

[0042] The support cylinder 2 remains fixed vertically, which in turn keeps the cooler 11 fixed vertically as well. The cooling box 10 is fixedly connected to the mounting frame 6. When the plastic bag 29 is thin, the cooling box 10 moves downward with the mounting frame 6, resulting in a larger distance between the cooler 11 and the cooling box 10. The portion of the cooler 11 extending into the cooling box 10 is shorter, reducing the cooling capacity of the cooler 11 for the heat exchange fluid to accommodate the thinner plastic bag 29. Similarly, when the plastic bag 29 is thick, the cooling box 10 moves downward with the mounting frame 6, resulting in a smaller distance between the cooler 11 and the cooling box 10. The portion of the cooler 11 extending into the cooling box 10 is longer, increasing the cooling capacity of the cooler 11 for the heat exchange fluid to accommodate the thicker plastic bag 29. This achieves adaptive adjustment of the cooling effect on the plastic bag 29 according to its thickness, avoiding the problems of insufficient cooling capacity leading to ineffective cooling or excessive cooling capacity causing rapid hardening and cracking of the plastic bag 29.

[0043] In one embodiment, the refrigeration box 10 is fixedly installed at one end of the positioning roller 7 near another pressing mechanism, and the air duct 27 and the refrigeration box 10 are fixedly connected by the air duct connecting plate 28. The heat exchange tube 13 passes through the air duct 27 and extends into the positioning sleeve 7, and the high-speed rotating rod 25 extends out of the positioning sleeve 7 and is rotatably installed on the air duct 27. The air duct 27 is located between the positioning roller 7 and the refrigeration box 10, and the high-speed blower fan blade 26 is located between the blower blade 9 and the heat exchange tube 13, so that the blower air blown out by the high-speed blower fan blade 26 is cooled by the heat exchange tube 13, and then blown onto the plastic bag 29 under the guidance of the air duct 27 for dust removal and cooling.

[0044] Working principle: After the plastic bag 29 is placed on the conveyor roller 1, the electromagnet 4 is turned off, the sliding rod 3 is disengaged from the suspension state and moves downward under its own gravity, so that the positioning roller 7 presses on the plastic bag 29. The positioning roller 7 applies a stable pressing force to the plastic bag 29. During the conveying process of the plastic bag 29, the plastic bag 29 drives the positioning roller 7 to rotate in one direction. The rotation of the positioning roller 7 drives the blower blades 9 to rotate together, so that the blower blades 9 blow air in the direction close to the adjacent pressing mechanism. The blower air blown by the blower blades 9 blows away the dust and heat adhering to the upper surface of the plastic bag 29, achieving the effect of dust removal and cooling.

[0045] When the plastic bag 29 is thin, the refrigeration box 10 moves downward more with the mounting frame 6, the distance between the refrigerator 11 and the refrigeration box 10 is larger, and the part of the refrigeration end of the refrigerator 11 extending into the refrigeration box 10 is shorter, thus reducing the cooling capacity of the refrigerator 11 for the heat exchange fluid to accommodate the thinner plastic bag 29. Similarly, when the plastic bag 29 is thick, the refrigeration box 10 moves downward less with the mounting frame 6, the distance between the refrigerator 11 and the refrigeration box 10 is smaller, and the part of the refrigeration end of the refrigerator 11 extending into the refrigeration box 10 is longer, thus increasing the cooling capacity of the refrigerator 11 for the heat exchange fluid to accommodate the thicker plastic bag 29.

[0046] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A bag-making machine for producing plastic bags, comprising a conveyor roller for conveying plastic bags, characterized in that: Two pressing mechanisms are slidably arranged above the conveyor roller, and the sliding direction of the pressing mechanism is parallel to the axis of the conveyor roller. The pressing mechanism includes a support cylinder and a sliding rod that slides up and down through the support cylinder. An electromagnet and a magnetic plate are respectively installed on the support cylinder and the sliding rod. The sliding rod is suspended under magnetic cooperation. A positioning roller that cooperates to squeeze the plastic bag is rotatably arranged below the sliding rod. A rotating rod is arranged along the axis of the positioning roller. A blower blade is fixedly connected between the rotating rod and the positioning roller. The plastic bag drives the positioning roller to move, causing the blower blade to blow air towards the adjacent pressing mechanism. The lower end of the sliding rod is fixedly connected to the mounting bracket, and the rotating rod is rotatably mounted on the mounting bracket. A refrigeration box containing heat exchange fluid is fixedly connected to the mounting bracket. The refrigeration end slides downward and is inserted into the refrigeration box. The refrigeration unit is fixedly connected to the support cylinder through the refrigeration unit connecting rod. The heat exchange tube extending into the positioning roller is fixedly mounted on the refrigeration box and communicates with the refrigeration box. The blower blades and heat exchange tubes are arranged sequentially at intervals along the direction close to another pressing mechanism.

2. The bag-making machine for preparing plastic bags according to claim 1, characterized in that: The pressing mechanism also includes a sliding nut, and the sliding nut is fixedly connected to the support cylinder through the support cylinder connecting rod. The sliding nuts of the two pressing mechanisms are sleeved at both ends of the same bidirectional transmission screw, and the same guide rod parallel to the axial direction of the bidirectional transmission screw slides through the two sliding nuts. The bidirectional transmission screw is driven to rotate by the first rotary drive motor.

3. The bag-making machine for preparing plastic bags according to claim 2, characterized in that: Mounting plates are fixedly installed at both ends of the bidirectional transmission screw. The output end of the first rotary drive motor, which is fixedly installed on one mounting plate, rotates through the mounting plate and is fixedly connected to one end of the bidirectional transmission screw. The other end of the bidirectional transmission screw is fixedly connected to a first fixed connecting rod that rotates through another mounting plate. The end of the first fixed connecting rod away from the bidirectional transmission screw is fixedly connected to a first limiting baffle that movably abuts against the side wall of the mounting plate.

4. The bag-making machine for preparing plastic bags according to claim 3, characterized in that: The output end of a second rotary drive motor, which is fixedly mounted on one of the mounting plates, rotates through the mounting plate and is fixedly connected to one end of a transport roller. The other end of the transport roller is fixedly connected to a second fixed connecting rod that rotates through another mounting plate. The end of the second fixed connecting rod away from the transport roller is fixedly connected to a second limiting baffle that movably abuts against the side wall of the mounting plate.

5. The bag-making machine for preparing plastic bags according to claim 1, characterized in that: The upper end of the sliding rod is fixedly connected to a sliding rod connecting plate, and the electromagnet is fixedly installed on the upper end of the support cylinder, while a magnetic plate that is magnetically repelled by the electromagnet is fixedly installed on the lower end surface of the sliding rod connecting plate.

6. The bag-making machine for preparing plastic bags according to claim 1, characterized in that: The positioning roller contains a rotating cylinder whose axis coincides with that of the rotating rod. The rotating rod extends into the rotating cylinder and is fixedly connected to the inner wall of the rotating cylinder by a rotating cylinder connecting rod. The outer wall of the rotating cylinder has a ring of gear teeth. A high-speed rotating rod with an axis parallel to that of the rotating cylinder and a diameter smaller than that of the rotating cylinder is inserted into the positioning roller. The outer wall of the high-speed rotating rod has gear teeth that mesh with the gear teeth on the outer wall of the rotating cylinder. Several high-speed blower fan blades are fixedly connected to the outside of the high-speed rotating rod and are located between the blower blades and the heat exchange tube.

7. The bag-making machine for preparing plastic bags according to claim 6, characterized in that: The refrigeration box is fixedly installed at one end of the positioning roller near the other pressing mechanism, and an air guide plate is fixedly installed at the end of the positioning roller near the other pressing mechanism. The air guide plate is located between the positioning roller and the refrigeration box, and the air guide plate is inclined downward along the direction near the other pressing mechanism.

8. The bag-making machine for preparing plastic bags according to claim 7, characterized in that: The heat exchange tube passes through the air duct and extends into the positioning roller, while the high-speed rotating rod extends out of the positioning roller and is rotatably mounted on the air duct.

9. The bag-making machine for preparing plastic bags according to claim 7, characterized in that: The air intake plate and the refrigeration box are fixedly connected by an air intake plate connecting plate.

10. The bag-making machine for preparing plastic bags according to any one of claims 1-9, characterized in that: Several heat exchange fins are fixedly connected to the outer wall of the heat exchange tube.

Images