Secondary bag grabbing device for plastic bag folding

Abstract

The utility model discloses a secondary bag grabbing device for plastic bag folding, which relates to the technical field of plastic bag folding equipment and comprises a transfer seat, a transversely arranged bag stroking body is arranged on the transfer seat, the bag stroking body is used for stroking the lower half part of a plastic bag, and a bag supporting table is arranged on the transfer seat and positioned on the reverse bag stroking side of the bag stroking body; a clamping piece higher than the plastic bag is installed on the transferring base, a clamping driver is installed between the clamping piece and the transferring base, and the clamping driver is used for driving the clamping piece to press the bag supporting table downwards. According to the plastic bag secondary flat folding device, secondary flat folding of a plastic bag is achieved, wrinkles and mess after secondary grabbing are avoided, follow-up folding and bundling can be conducted smoothly, and the final bundling quality can be guaranteed.

Description

Technical Field

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

[0002] During the production process, plastic shopping bags are folded and bundled in stacks. Depending on their length, the bags may require two, three, or even four folds. For example... Figure 11 As shown, the first fold involves folding both handles, while the second fold involves folding the plastic bag in half near the waist, with the folded handles positioned on the inside of the folded side. Further folding is then performed as needed. Currently, the mainstream method for the first fold utilizes the bending characteristic of the handles. Specifically, after a stack of plastic bags is grasped and placed on a trapezoidal plate, the handles hang naturally at the waist of the plate. By sequentially smoothing the two handles horizontally to the bottom of the trapezoidal plate, the handles are folded. Examples include the invention patent application with publication number "CN113371286A" and the utility model patent with publication number "CN221189454U," both of which employ this type of folding scheme. After folding, the handle portion, or the upper half of the plastic bag, is clamped, the trapezoidal plate retracts, and the lower half of the plastic bag hangs freely. Figure 8 and Figure 9 As shown, the downstream uses two grippers to grab the plastic bag. The lower gripper of the two grippers reverses the downward-hanging lower half and feeds it. When the lower gripper and the upper gripper are below and above the plastic bag respectively, the plastic bag is folded twice. The two grippers simultaneously hold the folded plastic bag and send it to the downstream workstation.

[0003] In practical use, the above-mentioned method of using upper and lower grippers to grasp plastic bags still has some problems. For example, the gripping area of ​​the grippers is limited. During the process of grasping the plastic bag, especially during the process of the lower grippers folding the lower half of the plastic bag, the lower half of the plastic bag will sag due to its own weight and flexibility, both between the two lower grippers and outside the two lower grippers. Figure 10 As shown, after the upper and lower grippers hold the plastic bag, the lower half of the bag is sent to the downstream workstation in a bent position. During further folding or bundling, the softer plastic bag is difficult to restore its stretched state. The bag will have wrinkles, affecting the smoothness of further folding or bundling, resulting in poor bundling quality. In some cases, the bag may even be stretched during further folding, causing quality problems. For relatively rigid plastic bags, although they will stretch again when sent to the downstream workstation due to their rigidity, the resulting stacks are often uneven, and the bags are ultimately bundled in a messy state, resulting in poor bundling quality as well. Therefore, the secondary gripping method for plastic bags needs to be improved. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a plastic bag folding and secondary gripping device that enables plastic bags to be folded flat twice, avoids wrinkles and mess after secondary gripping, facilitates subsequent folding and bundling, and ensures the final bundling quality.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is: a plastic bag folding and secondary bag gripping device, including a transfer seat, on which a horizontally arranged bag-straightening body is provided, the bag-straightening body being used to straighten the lower half of the plastic bag, and a bag-supporting platform being provided on the transfer seat on the opposite side of the bag-straightening body; a clamping member higher than the plastic bag is installed on the transfer seat, and a clamping driver is installed between the clamping member and the transfer seat, the clamping driver being used to drive the clamping member to press downward on the bag-supporting platform.

[0006] As a preferred technical solution, the clamping driver includes a clamping drive shaft rotatably mounted on the transfer seat and positioned above the plastic bag, a lower pressure arm fixedly mounted on the clamping drive shaft, and the clamping member mounted on the lower pressure arm.

[0007] As a preferred technical solution, a clamping transmission swing rod is fixedly provided on the clamping transmission shaft, and a clamping drive cylinder is hinged between the clamping transmission swing rod and the transfer seat.

[0008] As a preferred technical solution, the clamping drive shaft is located on the side of the clamping member closer to the plastic bag, and a bag passage space is provided between the clamping drive shaft and the bag support platform.

[0009] As a preferred technical solution, the bag-strapping body includes a bag-strapping plate extending downward from the edge of the bag support platform near the plastic bag.

[0010] As a preferred technical solution, the bag support platform is provided with several bag unloading clearance grooves at the edge away from the plastic bag.

[0011] As a preferred technical solution, the transfer seat is connected to a transfer driver.

[0012] Due to the adoption of the above technical solution, the plastic bag folding and secondary gripping device includes a transfer seat, on which a horizontally arranged bag-straightening body is provided. The bag-straightening body is used to straighten the lower half of the plastic bag. A bag-supporting platform is provided on the transfer seat on the opposite side of the bag-straightening body. A clamping member higher than the plastic bag is installed on the transfer seat. A clamping driver is installed between the clamping member and the transfer seat. The clamping driver is used to drive the clamping member to press downward on the bag-supporting platform. After the plastic bag is folded once and the lower half naturally bends, the transfer seat moves towards the plastic bag, and the bag-straightening body straightens the lower half of the plastic bag, causing it to fold a second time. The folded lower half is then supported by the bag-supporting platform, and the clamping member simultaneously reaches above the plastic bag. After the clamping driver drives the clamping member to press down on the bag-supporting platform, the clamping member and the bag-supporting platform form a clamping mechanism for the second-folded plastic bag. Throughout the process, both during the conveying and subsequent support, the lower half of the plastic bag is fully stressed, enabling a second, smooth folding. After the transfer seat returns, the plastic bag is delivered to the downstream workstation in a flat, supported state, preventing wrinkles and disarray after a second grasp. This facilitates subsequent folding and bundling, ensuring the final bundling quality. Attached Figure Description

[0013] The following figures are intended only to illustrate and explain the present invention and do not limit the scope of the present invention. Wherein:

[0014] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention;

[0015] Figure 2 yes Figure 1 A diagram showing the state after the second fold is completed;

[0016] Figure 3 yes Figure 2 A top-view structural diagram;

[0017] Figure 4 yes Figure 3 A schematic diagram of the structure in direction A;

[0018] Figure 5 yes Figure 2 A diagram showing the state when the clamping element presses down to hold the plastic bag and the upper bag fixing structure releases the clamping fixation.

[0019] Figure 6 yes Figure 5 A diagram showing the state of a plastic bag being clamped and conveyed downstream to the work site.

[0020] Figure 7 This is a top view of the structure of Embodiment 2 of this utility model;

[0021] Figure 8This is a schematic diagram of an existing gripper mechanism for picking up and using plastic bags;

[0022] Figure 9 yes Figure 8 A diagram showing the state of a plastic bag during the second folding process using a gripper.

[0023] Figure 10 yes Figure 9 A schematic diagram of the BB structure in the image;

[0024] Figure 11 This is a diagram illustrating the first fold of the handle and the second fold near the waist of a plastic bag.

[0025] In the diagram: 1-Upper bag fixing structure; 11-Bag removal clearance groove; 2-Transfer seat; 21-Bag lifting body; 22-Bag holding platform; 23-Bag unloading clearance groove; 3-Clamping component; 4-Clamping driver; 41-Clamping transmission shaft; 42-Lower pressure arm; 43-Clamping transmission swing rod; 44-Clamping drive cylinder; 8-Handle; 81-Lower gripper; 82-Upper gripper; 9-Plastic bag; 91-Handle. Detailed Implementation

[0026] 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.

[0027] Example 1: As Figures 1 to 6 As shown, the plastic bag folding and secondary gripping device is used to grip a plastic bag 9 that has been folded once and whose lower half hangs freely, and to deliver it to the downstream station. The first fold involves folding the two handles 91 of the plastic bag 9. After folding, the upper half with the handles 91 is clamped by relevant components, while the lower half of the plastic bag 9 hangs freely at the edge of the clamping structure. This is prior art known to those skilled in the art and will not be described in detail here. In the following description, the structure for clamping the upper half of the plastic bag 9 will be consistently described using the bag fixing structure 1 to simplify and clarify the description.

[0028] This device includes a transfer seat 2, which reciprocates between the downstream workstation and the upper bag fixing structure 1. Conventionally, the transfer seat 2 is slidably installed using a rail seat structure or a rod sleeve structure, and the transfer seat 2 is connected to a transfer driver; the transfer driver is the power structure that drives its reciprocating transfer, and can be implemented using a drive cylinder or a motor in conjunction with transmission, without limitation.

[0029] The transfer seat 2 is equipped with a horizontally arranged bag-strapping body 21, which is used to slide the lower half of the plastic bag 9. Here, the horizontal direction of the bag-strapping body 21 is consistent with the width direction of the bag. Figure 1 and Figure 2 As shown, after the transfer seat 2 is driven to move to the upper bag fixing structure 1, with the upper half of the plastic bag 9 clamped and fixed by the upper bag fixing structure 1, the relatively free lower half is swept downward by the bag-sweeping body 21, forming a secondary fold of the plastic bag 9; and because the bag-sweeping body 21 is a transversely continuous structure, it can sweep the lower half of the plastic bag 9 along the entire line, and the sweeping process will not cause the bag to bend in the width direction due to the weight and softness of the plastic bag 9 itself.

[0030] The transfer seat 2 is provided with a bag support platform 22 on the opposite side of the bag-straightening body 21. The bag support platform 22 is used to support the bag body 21 after it has been folded and straightened along its entire length. Under this support, such as Figure 2 As shown, the plastic bag 9 is ultimately folded twice into a flat shape. The bag support platform 22 can be made of a plate-like component, and the bag-straightening body 21 includes a bag-straightening plate extending downwards from the edge of the bag support platform 22 near the edge of the plastic bag 9. Based on the above bag-straightening principle, those skilled in the art can understand that the bag-straightening body 21 mainly functions to straighten the bag at the bend connected to the bag support platform 22. Therefore, using a long rod component or similar material near the edge of the bag support platform 22 as the bag-straightening body 21 achieves the same effect, and these modifications should also be within the scope of protection of this utility model.

[0031] A clamping member 3, higher than the plastic bag 9, is installed on the transfer seat 2. A clamping driver 4 is installed between the clamping member 3 and the transfer seat 2. The clamping driver 4 is used to drive the clamping member 3 to press downwards onto the bag support platform 22. Figure 1 and Figure 2 As shown, during the process of the transfer seat 2 being driven to move towards the upper bag fixing structure 1, the bag-strapping body 21 slides the bag body, the bag-supporting platform 22 supports the bag body accordingly, and the clamping member 3 simultaneously reaches above the plastic bag 9. After the plastic bag 9 is folded twice, as shown... Figure 5 As shown, the clamping member 3 is driven downward by the clamping driver 4, and the clamping member 3 and the bag support platform 22 together form a clamping effect on the double-folded plastic bag 9. As is known, Figure 3 As shown, the upper bag fixing structure 1 is provided with a bag-removing clearance groove 11 corresponding to the clamping member 3, to ensure that the clamping member 3 and the bag support platform 22 only clamp the plastic bag 9, and do not affect the removal of the plastic bag 9. After the upper bag fixing structure 1 releases the clamping and fixing of the upper part of the plastic bag 9, as shown... Figure 6As shown, the transfer seat 2 is driven to return to the downstream workstation, and the plastic bag 9 is then grabbed a second time and placed on the downstream workstation. During the return process, the plastic bag 9 remains flat throughout, supported by the bag support platform 22.

[0032] like Figure 3 and Figure 4 As shown, the clamping driver 4 in this embodiment includes a clamping drive shaft 41 rotatably mounted on the transfer seat 2 and positioned above the plastic bag 9. A pressing arm 42 is fixedly mounted on the clamping drive shaft 41, and the clamping member 3 is mounted on the pressing arm 42. The clamping drive shaft 41 is driven to rotate forward and reverse, thereby pressing down and lifting the clamping member 3, respectively. In this embodiment, a clamping drive lever 43 is fixedly mounted on the clamping drive shaft 41, and a clamping drive cylinder 44 is hinged between the clamping drive lever 43 and the transfer seat 2. The forward and reverse rotation of the clamping drive shaft 41 is achieved by extending and retracting the piston rod of the clamping drive cylinder 44, respectively. Of course, the clamping drive shaft 41 can also be driven directly by a motor or driven by a motor in conjunction with a transmission structure. In addition to the above structures, the clamping driver 4 can also be a vertically driven drive cylinder or a motor in conjunction with a transmission structure, with the clamping member 3 mounted on its driving end. The above solutions have equivalent effects and should all be within the protection scope of this utility model.

[0033] In this embodiment, the clamping drive shaft 41 is preferably located on the side of the clamping member 3 closest to the plastic bag 9, and a bag passage space is provided between the clamping drive shaft 41 and the bag support platform 22. This achieves two effects simultaneously: first, when the clamping member 3 reaches its clamping position, the bag-sweeping body 21 can sweep a longer bag, which the bag support platform 22 can then support, thus ensuring the flatness of the plastic bag 9 during subsequent return processing; second, after the plastic bag 9 is returned to the downstream station, more space is available around the clamping member 3, facilitating the arrangement of a receiving mechanism for the plastic bag 9 at the downstream station. After the receiving mechanism receives the plastic bag 9, the clamping member 3 is driven to lift, making it easier to immediately perform the next round of secondary gripping action in this embodiment.

[0034] Preferably, such as Figure 3 As shown, the bag holding platform 22 is provided with several bag unloading clearance grooves 23 at the edge away from the plastic bag 9, so that the receiving mechanism that clamps the plastic bag 9 from the top and bottom can also be used at the downstream work station to receive the plastic bag 9.

[0035] In this embodiment, the plastic bag 9, after being folded once and with its lower half naturally drooping, is fully conveyed and supported, ensuring that the lower half of the plastic bag 9 is fully stressed, thus achieving a second, flat fold. After the transfer seat 2 returns, the plastic bag 9 is delivered to the downstream workstation in a supported, flat state, avoiding wrinkles and messiness after a second grasp, facilitating subsequent folding and bundling, and ensuring the final bundling quality.

[0036] Example 2: Figure 7 As shown, the difference between this embodiment and Embodiment 1 is that the transfer seat 2 in this embodiment is equipped with two sets of bag-sweeping bodies 21, bag-supporting platforms 22, and clamping components 3, which are used in conjunction with a plastic bag 9 production line. In this structure, the transfer seat 2 shares a common set of sliding mechanism and transfer driver, while the clamping components 3 in the two sets can be configured with clamping drivers 4 respectively, or they can share the same clamping driver 4, which is not limited here.

[0037] 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 folding and secondary bag gripping device, including a transfer seat, characterized in that: The transfer seat is provided with a horizontally arranged bag-strapping body, which is used to slide the lower half of the plastic bag. The transfer seat is provided with a bag-supporting platform on the opposite side of the bag-strapping body. A clamping member higher than the plastic bag is installed on the transfer seat. A clamping driver is installed between the clamping member and the transfer seat. The clamping driver is used to drive the clamping member to press downward on the bag-supporting platform.

2. The plastic bag folding and secondary gripping device as described in claim 1, characterized in that: The clamping driver includes a clamping drive shaft rotatably mounted on the transfer seat and positioned above the plastic bag. A lower pressure arm is fixedly mounted on the clamping drive shaft, and the clamping element is mounted on the lower pressure arm.

3. The plastic bag folding and secondary gripping device as described in claim 2, characterized in that: A clamping transmission swing rod is fixedly provided on the clamping transmission shaft, and a clamping drive cylinder is hinged between the clamping transmission swing rod and the transfer seat.

4. The plastic bag folding and secondary gripping device as described in claim 2, characterized in that: The clamping drive shaft is located on the side of the clamping member closest to the plastic bag, and a bag passage space is provided between the clamping drive shaft and the bag support platform.

5. The plastic bag folding and secondary bag gripping device as described in claim 1, characterized in that: The bag-strapping body includes a bag-strapping plate that extends downward from the edge of the bag support near the plastic bag.

6. The plastic bag folding and secondary gripping device as described in claim 1, characterized in that: The bag-holding platform is provided with several bag-unloading clearance grooves at the edge away from the plastic bag.

7. The plastic bag folding and secondary gripping device according to any one of claims 1 to 6, characterized in that: The transfer station is connected to a transfer driver.

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