Plastic bag pressing device and plastic bag folding machine

Abstract

The utility model discloses a plastic bag pressing device and a plastic bag folding machine, and relates to the technical field of plastic bag folding equipment. The plastic bag pressing device comprises a bag pressing seat, a bag pressing swing shaft is rotatably mounted at the top of the bag pressing seat, a bag pressing plate is fixedly arranged on the bag pressing swing shaft, and the free end of the bag pressing plate is used for pressing a plastic bag; the bag pressing base is provided with a lifting limiting structure used for limiting the lifting position of the bag pressing plate. A vertical driver is installed on the bag pressing base, and the driving end of the vertical driver is connected with the bag pressing plate. The bag pressing device is simple in structure, reliable in bag pressing and beneficial to reducing the replacement frequency of parts and reducing the cost.

Description

Technical Field

[0001] This utility model relates to the technical field of plastic bag folding equipment, and in particular to a plastic bag pressing device and a plastic bag folding machine. Background Technology

[0002] A plastic bag with two handles, also known as a vest-style plastic bag, is folded and bundled in stacks during production. The first step in the folding process is folding the two handles. A common method is to utilize the natural downward movement of the handles. Specifically, after a stack of plastic bags is grasped and placed on a trapezoidal plate, the handles hang naturally at the sides of the plate. The handles are then folded downwards using the folding tabs on either side of the plate. After folding, the folded portion is pressed down, the trapezoidal plate is removed, and the remaining portion of the plastic bag hangs down naturally. As the downstream gripper picks up the bag, the ungripped portion is guided under the folded portion, completing a second fold. The pressure on the folded portion is then released, and the gripper can then carry the second-folded bag to the downstream station for further folding or bundling.

[0003] During the folding process described above, the bag body needs to be kept stable when folding the loops, and the folded portion of the plastic bag also needs to be firmly held in place after folding the loops. Since the stack of plastic bags is picked up from upstream by a robotic arm, the holding mechanism for the plastic bags at the folding device should avoid interfering with the reciprocating motion of the robotic arm. Accordingly, there are two main existing solutions for the holding mechanism of the plastic bags at the folding device.

[0004] The first approach uses two drive cylinders in conjunction, as illustrated in patent application CN113371286A. One cylinder is a vertical drive cylinder used to raise and lower the pressure plate, while the other is a horizontal drive cylinder mounted on the drive end of the vertical cylinder. The pressure plate is mounted on the drive end of the horizontal drive cylinder, which drives the pressure plate to reach or leave the top of the plastic bag. In this approach, the vertical drive cylinder lowers the pressure plate to hold the bag body during flap folding and to hold the folded portion of the plastic bag after flap folding. However, due to the long lever arm formed by the pressure plate and the extended piston rod of the horizontal drive cylinder, the holding force on the plastic bag is not ideal, and the downward bending moment is large. The piston rod of the horizontal drive cylinder experiences significant eccentric loading, leading to frequent cylinder failures and a high frequency of component replacement.

[0005] The second approach involves placing a holding mechanism above the robotic arm's reciprocating path. Examples include the invention patent application with publication number "CN113060374A" and the utility model patent with publication number "CN221189454U". In this approach, after the plastic bag reaches the folding device, the holding mechanism above the bag body presses down on it to facilitate the smooth folding of the flaps. After the flaps are folded, another holding mechanism continues to press down on the folded portion. This approach provides relatively reliable pressure on the plastic bag, but the operation is more complex, and the cost of components and programming is higher.

[0006] In summary, there is a need to provide a bag-pressing method that is simple in structure and reliable in pressing the bags, in order to improve the current situation. Utility Model Content

[0007] The technical problem to be solved by this utility model is to provide a plastic bag pressing device and plastic bag folding machine with simple structure, reliable bag pressing, and advantages in reducing the frequency of parts replacement and reducing costs.

[0008] To solve the above-mentioned technical problems, the technical solution of this utility model is: a plastic bag pressing device, including a pressing base, a pressing swing shaft rotatably mounted on the top of the pressing base, a pressing plate fixedly mounted on the pressing swing shaft, and the free end of the pressing plate used to press the plastic bag; the pressing base is provided with a lifting limiting structure for limiting the lifting position of the pressing plate; a vertical driver is mounted on the pressing base, and the driving end of the vertical driver is connected to the pressing plate.

[0009] As a preferred technical solution, the vertical actuator includes a drive pin radially fixed on the bag-pressing swing shaft, and a vertical drive cylinder with a piston rod extending vertically is installed on the bag-pressing seat. A drive sleeve is fixedly provided on the end of the piston rod of the vertical drive cylinder and sleeved on the drive pin. The drive sleeve and the drive pin are in clearance fit.

[0010] As a preferred technical solution, the lifting limiting structure includes a lifting limiting rod fixedly disposed on the side of the bag-pressing swing shaft near the plastic bag, and the lifting limiting rod is disposed on the upper side of the bag-pressing plate.

[0011] A plastic bag folding machine uses the aforementioned plastic bag pressing device. The plastic bag folding machine includes a frame, on which a bag body support is mounted. The plastic bag pressing device is installed on the bag body support's receiving side, and the free end of the pressing plate is used to press and hold the receiving end of the bag body support. A bag body support plate extending out of the receiving end of the bag body support is mounted on the bag body support, and the bag body support plate has bending spaces for the two handles of the plastic bag to bend downwards respectively. A folding ear device for folding the two handles of the plastic bag is mounted on the frame.

[0012] As a preferred technical solution, the folding ear device includes two folding ear plates located on the left and right sides of the bag body support plate, respectively. Each folding ear plate is connected to a folding ear feed driver, which is used to drive the corresponding folding ear plate to the bottom of the bag body support plate. The two folding ear plates are set at different heights.

[0013] As a preferred technical solution, a tray extension controller is provided between the bag body tray and the bag body support.

[0014] As a preferred technical solution, the bag support is movably mounted on the frame, and a support controller is provided between the bag support and the frame. The support controller controls the bag support to support the plastic bag or to move away from the plastic bag.

[0015] As a preferred technical solution, an auxiliary bag-holding device is also installed on the frame.

[0016] As a preferred technical solution, the auxiliary bag support device includes an auxiliary support platform that is vertically and movably mounted on the frame. The auxiliary support platform is used to support the plastic bag together with the folding ear device. A support platform feed driver is provided between the auxiliary support platform and the frame.

[0017] As a preferred technical solution, the bag pressing seat is movably mounted on the frame in the direction of approaching or away from the bag body support, and a bag pressing feed driver is provided between the bag pressing seat and the frame.

[0018] By employing the above technical solution, this utility model uses a swing-mounted bag-pressing plate whose free end presses the plastic bag. The bag-pressing plate is not prone to structural damage due to large bending moments. The pressing plate provides holding force through the vertical driving force of a vertical actuator. The vertical actuator experiences force in a direction similar to the driving direction, is not subject to eccentric loading, and its structure is less susceptible to damage, thus reducing the frequency of component replacement. This utility model requires only one driving force to achieve the bag-pressing requirement, has a simple structure, reduces component and programming costs, and because there is no need to consider the bending moment damage problem of the bag-pressing plate, the vertical actuator can provide higher driving force, ensuring reliable bag pressing. Attached Figure Description

[0019] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0020] Figure 1 This is a schematic diagram of the structure of the plastic bag pressing device according to an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 Diagram showing the state of the pressure plate pressing down;

[0022] Figure 3 yes Figure 1 A top-view structural diagram;

[0023] Figure 4 This is a schematic diagram of the structure of the plastic bag folding machine according to an embodiment of the present invention;

[0024] Figure 5 yes Figure 4 A top-view structural diagram;

[0025] Figure 6 yes Figure 4 A diagram showing the state of the bag being held in place by the bag-holding plate against the bag support platform.

[0026] Figure 7 yes Figure 6 A top view of the hidden pressure plate's folding lug device after the lugs are folded.

[0027] Figure 8 This is a diagram showing the state when the auxiliary support platform is raised to support the plastic bag;

[0028] Figure 9 yes Figure 8 Diagram showing the bag body tray retracted;

[0029] Figure 10 yes Figure 9 A top view of the concealed pressure plate structure;

[0030] Figure 11 yes Figure 9 A diagram showing the state of the bag body support after it has been removed from the plastic bag;

[0031] Figure 12 This is a diagram showing the state of the plastic bag being folded twice when the downstream gripper picks it up.

[0032] In the diagram: 1-Frame; 2-Bag body support platform; 21-Bag receiving end; 22-Support platform controller; 3-Bag body support plate; 31-Support plate telescopic controller; 4-Bag pressing seat; 41-Bag pressing swing shaft; 42-Bag pressing plate; 43-Lifting limit structure; 44-Vertical driver; 45-Drive pin; 46-Vertical drive cylinder; 47-Drive sleeve; 48-Secondary gripping clearance groove; 5-Ear folding device; 51-Ear folding plate; 52-Ear folding feed driver; 6-Auxiliary bag supporting device; 61-Auxiliary support platform; 62-Support platform feed driver; 7-Plastic bag; 71-Handle; 8-Robot arm; 9-Gripper. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the following detailed description, only certain exemplary embodiments of the present invention are described by way of illustration. Undoubtedly, those skilled in the art will recognize that various modifications can be made to the described embodiments without departing from the spirit and scope of the present invention. Therefore, the drawings and description are illustrative in nature and not intended to limit the scope of the claims.

[0034] like Figure 1 , Figure 2 and Figure 3 As shown, the plastic bag pressing device includes a pressing base 4, on the top of which a pressing swing shaft 41 is rotatably mounted. Conventionally, the pressing swing shaft 41 is mounted on the pressing base 4 via two rotating connecting seats. A pressing plate 42 is fixedly mounted on the pressing swing shaft 41. This fixing can be done by bolts or by direct welding; no limitation is made here. This embodiment only illustrates bolt fixing. The free end of the pressing plate 42 is used to press the plastic bag 7.

[0035] The bag pressing base 4 is provided with a lifting limiting structure 43 for limiting the lifting position of the bag pressing plate 42. After the bag pressing plate 42 is lifted, the pressing effect on the plastic bag 7 is released. The lifting limiting structure 43 restricts its lifting position, which can prevent its lifting height from affecting the reciprocating movement of the robot arm 8.

[0036] The lifting limiting structure 43 described in this embodiment includes a lifting limiting rod fixedly disposed on the side of the bag-pressing swing shaft 41 near the plastic bag 7, and the lifting limiting rod is located on the upper side of the bag-pressing plate 42. This structure provides a technical concept for rigidly limiting the bag-pressing plate 42 in the lifting direction. Accordingly, the lifting limiting rod is disposed on the side of the bag-pressing swing shaft 41 away from the plastic bag 7 and located on the lower side of the bag-pressing plate 42; and other non-rod-shaped structures, such as limiting pins, limiting bosses, etc., can be used, with the same effect. These alternative means should all be within the protection range of the lifting limiting structure 43.

[0037] A vertical actuator 44 is mounted on the bag-pressing base 4, and the driving end of the vertical actuator 44 is connected to the bag-pressing plate 42. The vertical driving force of the vertical actuator 44 provides the pressing force to the bag-pressing plate 42 to hold the plastic bag 7. The structure is simple, which helps reduce component and programming costs. Furthermore, the bag-pressing plate 42 will not suffer structural damage due to large bending moments, and the vertical actuator 44 does not bear eccentric loads, thus reducing the frequency of component replacement. Since there is no need to consider the bending moment damage problem of the bag-pressing plate 42, the vertical actuator 44 can provide higher driving force, ensuring reliable bag pressing.

[0038] The vertical actuator 44 described in this embodiment includes a drive pin 45 radially fixed on the bag-pressing swing shaft 41. A vertical drive cylinder 46 with a piston rod extending vertically is mounted on the bag-pressing seat 4. A drive sleeve 47 is fixedly fitted onto the drive pin 45 at the end of the piston rod of the vertical drive cylinder 46, and the drive sleeve 47 and the drive pin 45 are in clearance fit. When the vertical drive cylinder 46 drives the drive pin 45 to move, the bag-pressing plate 42 fixed on the bag-pressing swing shaft 41 swings, thereby achieving an indirect connection between the drive end of the vertical actuator 44 and the bag-pressing plate 42. Of course, it is also possible for the drive pin 45 to be directly mounted on the bag-pressing plate 42, and this method is also within the protection scope of this utility model.

[0039] In this embodiment, the drive pin 45 is located on the side of the bag-pressing swing shaft 41 away from the plastic bag 7. Therefore, when the vertical drive cylinder 46 extends, it drives the bag-pressing plate 42 to press down, and when it retracts, it drives the bag-pressing plate 42 to lift up. Because the downward stroke of the free end of the bag-pressing plate 42 is small, only a small swing amplitude is generated at the drive pin 45. The drive sleeve 47 and the drive pin 45 are fitted with a clearance fit, which can fully accommodate this small swing amplitude without jamming, and ensure the drive connection. Of course, the drive pin 45 can also be located on the side of the bag-pressing swing shaft 41 closer to the plastic bag 7. In this case, the vertical drive cylinder 46 drives the bag-pressing plate 42 to press down when it retracts, and drives the bag-pressing plate 42 to lift when it extends. The effect is the same, and these variations are all within the protection range of the vertical actuator 44.

[0040] In addition to the above-mentioned structure, the vertical actuator 44 can also be a drive cylinder that is hinged between the bag pressing plate 42 and the frame 1, or it can be driven by a motor to rotate the bag pressing swing shaft 41 to achieve pressing or lifting. These structural forms are also within the protection range of the vertical actuator 44.

[0041] like Figures 4 to 12 As shown in the figure, this embodiment also provides a plastic bag folding machine using the aforementioned plastic bag pressing device. Specifically, the plastic bag folding machine includes a frame 1, the specific structure of which can be flexibly configured according to the actual functional components and other requirements. This configuration is a conventional technical means in the art, so the structure of the frame 1 is not limited here, and its specific structure is not illustrated in detail.

[0042] A bag support platform 2 is installed on the frame 1, which supports the body of the plastic bag 7 after it arrives. A plastic bag pressing device is installed on the bag-arriving side of the bag support platform 2, and the free end of the pressing plate 42 is used to press against the bag-arriving end 21 of the bag support platform 2. That is, after the vertical driver 44 drives the pressing plate 42 downwards, the pressing plate 42 and the bag-arriving end 21 of the bag support platform 2 together form a fixed position on the body of the plastic bag 7. Based on this embodiment, the pressing plate 42 can generate better downward pressure, so the bag body is reliably fixed.

[0043] Preferably, the bag-pressing seat 4 is movably mounted on the frame 1 along the direction of approaching or moving away from the bag body support 2, and a bag-pressing feed driver is provided between the bag-pressing seat 4 and the frame 1. Thus, before the bag arrives, the bag-pressing seat 4 can be positioned away from the bag body support 2, providing space for the plastic bag 7 to be delivered by the robot arm 8 to be placed on the bag body support 2. After the bag arrives, the bag-pressing seat 4 is driven by the bag-pressing feed driver to approach the bag body support 2, and upon reaching the designated position, the bag-pressing plate 42 is driven down to fix the bag body. The bag-pressing seat 4 can be slidably mounted on the frame 1 using a rail, rod sleeve, or other means, and the bag-pressing feed driver can be implemented using a drive cylinder or a motor; no limitation is made here, and it is not shown in the figure.

[0044] The bag support platform 2 is equipped with a bag support plate 3 extending from the bag receiving end 21 of the bag support platform 2. The bag support plate 3 has bending spaces for the two handles 71 of the plastic bag 7 to bend downwards. Conventionally, the portion of the bag support plate 3 extending at least from the bag receiving end 21 of the bag support platform 2 is set in a trapezoidal shape, and the spaces at the two sides of the trapezoid constitute the bending spaces. After the plastic bag 7 is delivered, most of the bag body is supported by the bag support platform 2, and only the portion near the handles 71 is supported by the bag support plate 3, while the unsupported handles 71 bend naturally at the bending spaces.

[0045] The frame 1 is equipped with a folding device 5 for folding the two handles 71 of the plastic bag 7, so as to fold the two naturally drooping handles 71. In this embodiment, the folding device 5 includes two folding plates 51 located on the left and right sides of the bag body support plate 3, respectively. Each folding plate 51 is connected to a folding plate feed driver 52, which drives the corresponding folding plate 51 to the bottom of the bag body support plate 3. The two folding plates 51 are set at different heights. During the process of the folding plate 51 being driven to the bottom of the bag body support plate 3, the naturally drooping handles 71 can be straightened. The handles 71 are folded with the waistline of the trapezoid at the bag body support plate 3 as the folding line. Among them, the folding plate 51 closer to the bag body support plate 3 in the height direction is folded first, and the other folding plate 51 then folds the other handle 71.

[0046] A tray extension controller 31 is provided between the bag body tray 3 and the bag body support platform 2, so that after the handle 71 is folded, the bag body tray 3 retracts into the bag body support platform 2, releasing its supporting function. The tray extension controller 31 can be implemented by a drive cylinder or a motor, which is not limited here.

[0047] The bag support platform 2 is movably mounted on the frame 1. A support platform controller 22 is provided between the bag support platform 2 and the frame 1. The support platform controller 22 controls the bag support platform 2 to support or remove the plastic bag 7. After the bag support plate 3 retracts the bag support platform 2, the support platform controller 22 drives the bag support platform 2 to leave the plastic bag 7, that is, releases its support for the body of the plastic bag 7. During this process, the vertical actuator 44 maintains a continuous pressing driving force on the bag pressing plate 42, so the bag pressing plate 42 will continue to press down as the bag support platform 2 leaves, until the plastic bag 7 is pressed onto the folding plate 51 of the folding device 5, thereby forming a clamping and fixing of the folded part of the plastic bag 7.

[0048] Accordingly, the bag-pressing function of the bag-pressing plate 42 in this embodiment is manifested in two aspects: first, it presses down on the body of the plastic bag 7 when the bag first arrives to ensure smooth subsequent folding of the ear flaps; second, after the ear flaps are folded, it presses down on and fixes the folded portion of the plastic bag 7. Both of these bag-pressing transitions are achieved through the driving force of a vertical actuator 44, which simplifies the structure and reduces component and programming costs.

[0049] The bag support platform 2 can be either swing-mounted on the frame 1 or vertically slidable on the frame 1. This embodiment does not impose any restrictions and only illustrates the swing-mounted configuration. In the swing-mounted configuration, the support platform controller 22 is implemented using a control cylinder that is hinged between the bag support platform 2 and the frame 1.

[0050] Preferably, an auxiliary bag-supporting device 6 is also installed on the frame 1 to support the plastic bag 7 together with the folding plate 51 of the folding device 5 after the folding ears are folded. In this embodiment, the auxiliary bag-supporting device 6 includes an auxiliary support platform 61 vertically movably mounted on the frame 1. The auxiliary support platform 61 is used to support the plastic bag 7 together with the folding ear device 5. A platform feed driver 62 is provided between the auxiliary support platform 61 and the frame 1. Preferably, two auxiliary bag-supporting devices 6 are arranged symmetrically on the left and right sides to provide more comprehensive support for the plastic bag 7. Of course, the auxiliary support platforms 61 in the two auxiliary bag-supporting devices 6 can be configured with platform feed drivers 62 separately or together; no limitation is made here.

[0051] In this embodiment, when working, such as Figure 4 and Figure 5 As shown, initially, the bag pressing seat 4 is located away from the bag body support platform 2, and the bag body support plate 3 at the bag body support platform 2 is in an extended state. The robot arm 8 grasps the tail of the plastic bag 7 and delivers the plastic bag 7 to the bag body support platform 2 with the tail in front and the head behind. The part of the plastic bag 7 not grasped by the robot arm 8 is ultimately supported by the bag body support platform 2 and the bag body support plate 3, and the two handles 71 of the plastic bag 7 naturally bend at the bending space of the bag body support plate 3.

[0052] The bag-pressing seat 4 is driven to move closer to the bag body support 2. After reaching the designated position, the vertical actuator 44 drives the bag-pressing plate 42 to press down, such as... Figure 6 As shown, the free end of the bag-pressing plate 42 presses against the bag-feeding end 21 of the bag body support 2, thus fixing the bag body. The robotic arm 8 releases its grip and returns upstream to grab the next stack of plastic bags 7.

[0053] like Figure 7 As shown, the folding device 5 folds the two handles 71 of the plastic bag 7, and after folding, it is as follows: Figure 8 As shown, the auxiliary platform 61 is raised by the platform feed driver 62, as... Figure 10 As shown, the auxiliary support 61 and the folding plate 51 of the folding device 5, more specifically, together with the higher folding plate 51 in the folding device 5, form a support for the folded part of the plastic bag 7.

[0054] like Figure 9 and Figure 10 As shown, the bag body tray 3 is driven to retract, as... Figure 11As shown, the bag body support 2 is driven away from the plastic bag 7, and the bag pressing plate 42 is pressed down by the driving force of the vertical actuator 44, ultimately pressing against the folding plate 51 and the auxiliary support 61, together forming a clamping grip on the folded part of the plastic bag 7. After the bag body support 2 leaves, the part of the plastic bag 7 that it originally supported naturally bends. Figure 12 As shown, when the downstream gripper 9 comes to pick up the plastic bag 7, the naturally drooping part of the bag can be reversed and sent to the underside of the folded part, completing the second fold of the plastic bag 7, and then the plastic bag 7 is picked up after the second fold. For this purpose, the bag pressing plate 42, the folding ear plate 51, and the bag body support 2 are provided with secondary gripping avoidance grooves 48 corresponding to the gripper 9. In this embodiment, since the folding ear plate 51 and the bag body support 2 together form a supporting structure under the folded part, and the folding ear plate 51 is rectangular, it is only necessary to provide the secondary gripping avoidance grooves 48 on the bag body support 2.

[0055] Then, the bag pressing plate 42 is driven to lift, and the gripper 9 picks up the double-folded plastic bag 7 and sends it to the downstream station. The bag pressing seat 4 is driven back to its original position, the folding ear device 5 and the auxiliary bag supporting device 6 return to their original positions, the bag body support platform 2 is driven back to its original position, and the bag body support plate 3 extends out of the bag receiving end 21 of the bag body support platform 2, waiting for the robot arm 8 to deliver the next stack of plastic bags 7.

[0056] In this embodiment, the vertical driving force of the vertical actuator 44 drives the pressing plate 42 to press down, which can eliminate the influence of large bending moment and eccentric load, achieve better downward pressure, and ensure reliable holding. Moreover, the driving force of one vertical actuator 44 can transform the fixing of the bag body by the pressing plate 42 and the bag body support 2 before the folding ear to the fixing of the folded part by the pressing plate 42, the folding ear plate 51, and the auxiliary support 61 after the folding ear, which greatly simplifies the bag fixing method and helps to reduce the cost of parts and programming.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A plastic bag pressing device, including a pressing base, characterized in that: The top of the bag-pressing seat is rotatably mounted with a bag-pressing swing shaft, and a bag-pressing plate is fixedly mounted on the bag-pressing swing shaft. The free end of the bag-pressing plate is used to press the plastic bag. The bag-pressing seat is provided with a lifting limiting structure for limiting the lifting position of the bag-pressing plate. A vertical driver is mounted on the bag-pressing seat, and the driving end of the vertical driver is connected to the bag-pressing plate.

2. The plastic bag pressing device as described in claim 1, characterized in that: The vertical actuator includes a drive pin that is radially fixed on the bag-pressing swing shaft. A vertical drive cylinder with a piston rod extending vertically is installed on the bag-pressing seat. A drive sleeve fitted on the drive pin is fixedly provided on the end of the piston rod of the vertical drive cylinder. The drive sleeve and the drive pin are in clearance fit.

3. The plastic bag pressing device as described in claim 1, characterized in that: The lifting limit structure includes a lifting limit rod fixedly installed on the side of the bag-pressing swing shaft near the plastic bag, and the lifting limit rod is located on the upper side of the bag-pressing plate.

4. A plastic bag folding machine, characterized in that: The plastic bag pressing device as described in claim 1, 2 or 3 is used; the plastic bag folding machine includes a frame, on which a bag body support is mounted, the plastic bag pressing device is mounted on the bag body support on the bag receiving side, and the free end of the pressing plate is used to press the bag receiving end of the bag body support; a bag body support plate extending out of the bag receiving end of the bag body support is mounted on the bag body support, and the bag body support plate is provided with bending spaces for the two handles of the plastic bag to bend respectively; The frame is equipped with a folding lug device for folding the two handles of the plastic bag.

5. The plastic bag folding machine as described in claim 4, characterized in that: The folding device includes two folding plates located on the left and right sides of the bag body support plate, respectively. Each folding plate is connected to a folding plate feed driver, which drives the corresponding folding plate to the bottom of the bag body support plate. The two folding plates are set at different heights.

6. The plastic bag folding machine as described in claim 4, characterized in that: A tray extension controller is provided between the bag body tray and the bag body support.

7. The plastic bag folding machine as described in claim 4, characterized in that: The bag support is movably mounted on the frame, and a support controller is provided between the bag support and the frame. The support controller controls the bag support to support the plastic bag or to move away from the plastic bag.

8. The plastic bag folding machine as described in claim 4, characterized in that: An auxiliary bag-supporting device is also installed on the frame.

9. The plastic bag folding machine as described in claim 8, characterized in that: The auxiliary bag support device includes an auxiliary support platform that is vertically and movably mounted on the frame. The auxiliary support platform is used to support the plastic bag together with the folding ear device. A support platform feed driver is provided between the auxiliary support platform and the frame.

10. The plastic bag folding machine as described in claim 4, characterized in that: The bag pressing seat is movably mounted on the frame in a direction close to or away from the bag support platform, and a bag pressing feed driver is provided between the bag pressing seat and the frame.

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