Bag beating and tidying device for plastic bags

Abstract

The utility model discloses a plastic bag beating and tidying device which comprises a rack, a bag arranging mechanism and a blocking rod mechanism and is characterized in that a bag beating mechanism is further arranged at the corresponding position in front of or behind the bag arranging mechanism, the bag beating mechanism comprises a bag beating plate and a driving assembly, the bag beating plate comprises a left beating plate and a right beating plate, and the left beating plate and the right beating plate are arranged on the rack. The left beating plate and the right beating plate are connected to the driving assembly, the driving assembly is an air cylinder or a driving module, the plastic bags which are arranged in order are easy to load in the packaging process, a row of plastic bags with the same specification can be packaged with packaging bags with the relatively small specification, and the packaging efficiency is greatly improved. In this way, the packaging cost can be saved, the plastic bag is not prone to shaking in the packaging bag and not prone to deformation in the transportation process, packaging is attractive, and the stereoscopic impression is high.

Description

Technical Field

[0001] The utility model relates to a device for straightening plastic bags by patting. Background Art

[0002] The utility model relates to a device for straightening plastic bags by patting, which pushes and straightens plastic bags by patting the left and right sides of the plastic bags to improve the packaging accuracy and neatness. Generally, dozens of plastic bags are stacked together, then folded multiple times and bundled into long strips, and then erected one by one by a discharging device to form a row, and then each row of plastic bags is stacked into a packaging bag or a packing box in turn by a manipulator mechanism to realize the automatic packaging of plastic bags. The authorized announcement number CN212501423U discloses a plastic bag discharging machine, which includes a frame, and a discharging device (discharging mechanism), a baffle device (mechanism), etc. are also arranged on the frame. Existing bag-making machines and bundling machines are both dual-channel, that is, the bundling machine bundles two bundles of plastic bags at the same time each time, and the plastic bag discharging machine will correspondingly discharge two rows of plastic bags on the left and right, placed left and right. The problems existing in the existing automatic packaging and plastic bag discharging machine are as follows: during the bag-making, folding and bundling process of plastic bags, each bundle of plastic bags produced will inevitably be biased to the left or right in the left-right direction. After being discharged by the plastic bag discharging machine, a row of plastic bags that is not aligned left and right will be formed. When the manipulator of the packaging machine loads them into a packaging bag or a packing box, due to their non-alignment left and right, it is required to increase the width size of the packaging bag or the packing box, which not only wastes packaging materials, but also seriously affects the neatness and beauty of the packaging. Summary of the Invention

[0003] To solve the deficiencies of the prior art, the technical problem to be solved by the utility model is to design a bag-patting mechanism, which is applied to the automatic packaging of plastic bags or a plastic bag discharging device, and enables each row of plastic bags to be automatically adjusted and straightened by patting the two sides of the plastic bags, so as to provide a device for straightening plastic bags by patting for the automatic packaging of plastic bags.

[0004] To achieve the above technical purpose, the technical solution of the utility model is: a device for straightening plastic bags by patting, including a frame, a bag-discharging mechanism, and a baffle mechanism, characterized in that: a bag-patting mechanism is also arranged at a corresponding position in front of or behind the bag-discharging mechanism, the bag-patting mechanism includes a bag-patting plate and a driving component, the bag-patting plate includes a left patting plate and a right patting plate, the left patting plate and the right patting plate are connected to the driving component, and the driving component is a cylinder or a driving module.

[0005] The described driving component also has diverse driving methods. It can be linear movement, such as a linear module, etc., or it can be an arc-shaped swinging movement. For example, a swinging cylinder or a rotary cylinder can be used to swing the bag slapping plate, or an eccentric wheel mechanism, a swing rod mechanism, etc. can be used to drive the bag slapping plate to swing, etc.

[0006] The described driving module is a transmission mechanism that converts the rotational movement of a motor into linear movement or swinging movement. It has many structural forms. It can be a ball screw driven by a motor, or a belt drive mechanism driven by a motor, or a rack and pinion mechanism driven by a motor, or an eccentric wheel or crank mechanism driven by a motor or a cylinder, etc. Its implementation methods are diverse.

[0007] The described motor can be a stepper motor or a servo motor. With this design, automatic adjustment is achieved by controlling the rotation angle of the stepper motor or the servo motor to adapt to plastic bags of different length specifications.

[0008] As a preferred technical solution, two left slapping plates and two right slapping plates are respectively provided, and connecting members are also connected to the two left slapping plates and the two right slapping plates.

[0009] With this design, it is possible to simultaneously slap and organize the plastic bags in the left and right rows under the condition of using one driving component, improving the work efficiency.

[0010] As a preferred technical solution, the described driving component is a cylinder, and it also includes a guide rail and a slider. With this design method, the structure is simple, the manufacturing cost is low, and the operation is convenient.

[0011] As a further improvement, a lead screw pair is also connected to the cylinder. With this design, the structure is simple and the cost is relatively low. By manually rotating the left - hand and right - hand lead screw, the left - hand and right - hand nuts can move the same position in the left and right directions respectively, so as to adjust the distance between the left slapping plate and the right slapping plate to meet the needs of plastic bags of different length specifications.

[0012] The technical problem to be solved by the present utility model is how to make the plastic bags discharged by the bag arranging mechanism and the baffle mechanism neat. The bag arranging mechanism and the baffle mechanism belong to the prior art, and those skilled in the art can implement them without creative labor, so the bag arranging mechanism and the baffle mechanism will not be elaborated herein.

[0013] The beneficial effects of the present utility model are as follows: After arranging the bag patting and aligning device on the plastic bag discharging device, the plastic bags during the discharging process or after being discharged are aligned, which makes them easier to be loaded during the loading process, occupies relatively less space in the packaging bag during packaging, and for plastic bags of the same specification, relatively smaller-sized packaging bags can be selected for packaging. This not only saves packaging costs, but also makes the package look three-dimensional and beautiful. The plastic bags are not easy to shake in the packaging bag and are not easy to deform during transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic top view of the structural principle of Embodiment 1;

[0015] Figure 2 It is a schematic front and side view of the structural principle of the retaining rod mechanism and the bag patting mechanism of Embodiment 1;

[0016] Figure 3 It is a schematic left side view of the structural principle of Embodiment 1;

[0017] Figure 4 It is a schematic top view of the structural principle of Embodiment 2;

[0018] Figure 5 It is a schematic front and side view of the structural principle of the bag patting mechanism of Embodiment 2;

[0019] Figure 6 It is a schematic top view of the structural principle of Embodiment 3;

[0020] Figure 7 It is a schematic left side view of the structural principle of Embodiment 3;

[0021] Figure 8 It is a schematic top view of the structural principle of Embodiment 4;

[0022] Figure 9 It is a schematic top view of the structural principle of Embodiment 5;

[0023] Figure 10 It is a schematic top view of the structural principle of Embodiment 6.

[0024] In the figure: 1 - frame; 2 - bag discharging mechanism; 21 - bag discharging rod; 22 - rocker arm; 23 - swing cylinder; 3 - retaining rod mechanism; 31 - retaining rod; 32 - lifting mechanism; 4 - bag patting mechanism; 41 - bag patting plate; 411 - left patting plate; 412 - right patting plate; 413 - connecting piece; 414 - guide rail; 415 - slider; 42 - driving assembly; 421 - cylinder; 420 - guide rod cylinder; 422 - driving module; 423 - motor; 424 - ball screw; 425 - reverse thread ball nut; 426 - right hand thread ball nut; 427 - module guide rail; 428 - module slider; 429 - synchronous belt; 430 - synchronous pulley; 431 - rotating shaft; 432 - rack; 433 - gear; 434 - swing rod; 435 - pin shaft; 436 - connecting rod; 437 - hinge shaft; 5 - lead screw pair; 51 - left and right hand thread lead screw; 52 - right hand thread nut; 53 - reverse thread nut; 54 - hand wheel; 55 - connecting plate; 6 - conveying mechanism; 7 - plastic bag. Detailed implementation mode

[0025] In order to further describe the technical solution of the present invention, six specific embodiments are used below in combination with the attached drawings for further specific illustration. In the description of the technical solution of the present invention, the front side is above the attached drawing Figure 1 (top view), and the back side is below it. Figure 1

[0026] Embodiment 1, as shown in Figure 1 , Figure 2 , Figure 3 : The bag patting mechanism 4 of Embodiment 1 is arranged behind the bag discharging mechanism 2, and the driving mechanism 42 is a driving module 422, and the driving module 422 is a ball screw mechanism driven by a motor.

[0027] As shown in Figure 1 , Figure 2 , Figure 3As shown in the figure: Two sets of bag discharging mechanisms 2 are installed at the front position of the rack 1. Each set of bag discharging mechanism 2 includes two bag discharging rods 21. Four bag discharging rods 21 of the two sets are installed at intervals on the bag discharging rod rotating shaft (omitted). A rocker arm 22 is installed at one end of the bag discharging rod rotating shaft. A swing cylinder 23 is installed on the rocker arm 22, and the tail end of the swing cylinder 23 is installed on the rack 1. A stop rod mechanism 3 is installed at the rear position of the bag discharging mechanism 2. The stop rod mechanism 3 includes six stop rods 31 and a lifting mechanism 32. The lifting mechanism 32 is installed at the position of the rack 1 below and behind the bag discharging mechanism 2. The lifting mechanism 32 is a guide rod cylinder. The stop rods 31 are installed at intervals on the cylinder rod seat of the guide rod cylinder. The six stop rods 31 are divided into two groups. Each group of three stop rods 31 corresponds to the front group of bag discharging rods 21 in an alternating manner, that is, the gaps between the bag discharging rods 21 and the stop rods 31 correspond to each other. A left - right - hand threaded ball screw 424 is rotatably installed above the front and rear positions of the bag discharging mechanism 2 and the stop rod mechanism 3. A right - hand threaded ball nut 426 is installed on the left side of the ball screw 424, and a left - hand threaded ball nut 425 is installed on the right side. A motor 423 is installed at one end of the ball screw 424. The motor 423 is a stepping motor (it can also be a servo motor). A module guide rail 427 is installed in front of the ball screw 424, making the module guide rail 427 parallel to the rear ball screw 424. Four module sliders 428 are slidably installed on the module guide rail 427. Four bag - patting plates 41 are installed on each module slider 428. The four bag - patting plates 41 are divided into two left patting plates 411 and two right patting plates 412. The two left patting plates 411 are respectively on the left sides of the left and right plastic bags 7 on the bag discharging rods 21, and the two right patting plates 412 are respectively on the right sides of the plastic bags 7. Then two connecting pieces 413 are set. The two left patting plates 411 are connected by the two connecting pieces 413 respectively, and the two right patting plates 412 are connected. Adjust the control system of the motor 423 (stepping motor), and set the rotation angle of the motor 423 until the relative distance between the left patting plate 411 and the right patting plate 412 corresponds to the left - right length of the plastic bag 7 as the end point.

[0028] The specific working process of Embodiment 1 is as follows: As Figure 1As shown, after the left and right plastic bags 7 are respectively conveyed to the two sets of bag arranging mechanisms 2 by the conveying mechanism, each plastic bag 7 is then located between the left clamping plate 411 and the right clamping plate 412. Subsequently, the motor 423 is turned on to drive the ball screw 424 to rotate, so that the right-hand thread ball nut 426 and the left-hand thread ball nut 425 move towards the middle simultaneously. Driven by them, the left clamping plate 411 and the right clamping plate 412 also move towards the middle along the module guide rail 427 simultaneously; when the left clamping plate 411 and the right clamping plate 412 move towards the middle to a position where the distance between the left clamping plate 411 and the right clamping plate 412 is close to the left and right length of the plastic bag 7, the motor 423 stops rotating. At this time, after the plastic bag 7 is slapped and pushed at its left and right ends by the left clamping plate 411 or the right clamping plate 412, the plastic bag 7 is pushed and adjusted to be aligned with the plastic bags 7 arranged behind. Subsequently, rotate in the reverse direction to make the left clamping plate 411 and the right clamping plate 412 return to the initial position. After each plastic bag 7 is slapped and arranged one by one, a neat row of plastic bags 7 will be formed on the left and right, and the work of the first embodiment is completed.

[0029] The second embodiment is as Figure 4 、 Figure 5 shown: The driving component 42 of the second embodiment is a belt drive mechanism driven by a motor 423, mainly including a motor 423, a synchronous pulley 430, a synchronous belt 429, and a rotating shaft 431.

[0030] As Figure 4 、 Figure 5 shown: On the upper frame 1 between the bag arranging mechanism 2 and the baffle rod mechanism 3, a rotating shaft 431 is respectively installed on the left and right. A synchronous pulley 430 is respectively installed on the two rotating shafts 431. A synchronous belt 429 is installed on the two synchronous pulleys 430. A motor 423 is connected and installed on the left rotating shaft 431; Two left clamping plates 411 are fixedly connected to the front layer of the synchronous belt 429, so that the two left clamping plates 411 respectively correspond to the left side of the plastic bag 7; Two right clamping plates 412 are installed on the rear layer of the synchronous belt 429, so that the two right clamping plates 412 respectively correspond to the right side of the plastic bag 7. The installation methods of other mechanisms in the second embodiment are basically the same as those in the first embodiment.

[0031] The working process of the second embodiment is as follows: As Figure 4 shown, when the motor 423 rotates clockwise, the front layer of the synchronous belt 429 drives the two left clamping plates 411 to move from left to right. At the same time, the rear layer of the synchronous belt 429 drives the two right clamping plates 412 to move from right to left simultaneously. When the distance between the left clamping plate 411 and the right clamping plate 412 is close to the length of the plastic bag 7, the motor 423 stops rotating, and then reverses and resets, so that the two plastic bags 7 on the two sets of bag arranging mechanisms 2 are respectively slapped and pushed, so that the two plastic bags 7 are respectively aligned with the plastic bags 7 arranged behind, and the working process of the second embodiment is completed.

[0032] Example 3, as Figure 6 、 Figure 7 shown, the main difference between Example 3 and Example 1 is that the bag slapping mechanism 4 is arranged at the corresponding position in front of the bag discharging mechanism 2, that is, it slaps and pushes the plastic bag 7 on the conveying mechanism 6 in front of the bag discharging mechanism 2; the driving component 42 is a rack and pinion mechanism driven by a motor.

[0033] As Figure 6 、 Figure 7 shown: A motor 423 is installed at the left and right middle positions above the front part of the rack 1 of the bag discharging mechanism 2. A gear 433 is installed on the motor shaft of the motor 423. A module guide rail 427 is installed respectively in front of and behind the gear 433. Two module sliders 428 are slidably installed on each module guide rail 427. A rack 432 is installed on the two module sliders 428 of each front and rear module guide rail 427 respectively, so that one side of the toothed surface of the two racks 432 meshes with the gear 433 respectively; Two left slapping plates 411 are installed on the front rack 432, and two right slapping plates 412 are installed on the rear rack 432, so that one left slapping plate 411 on the left and one right slapping plate 412 on the left correspond to both ends of the plastic bag 7 on one set of bag discharging mechanisms 2 on the left, and the left slapping plate 411 on the right and the right slapping plate 412 on the right correspond to both ends of the plastic bag 7 on the set of bag discharging mechanisms 2 on the right.

[0034] The working process of Example 3 is as follows: As Figure 6 Figure 7 shown, when the motor 423 rotates clockwise, the front rack 432 moves to the right under the drive of the gear 433, and the two left slapping plates 411 move to the right during the movement; At the same time, the rear rack 432 drives the two right slapping plates 412 to move to the left simultaneously. When the distance between the left slapping plate 411 and the right slapping plate 412 in each group is close to the left and right length of the plastic bag 7, the two plastic bags 7 are respectively slapped neatly and aligned with the plastic bags placed behind. After that, the motor 423 rotates back to reset the left slapping plate 411 and the right slapping plate 412, and the working process of Example 3 is completed.

[0035] Example 4, as Figure 8As shown in the figure, the main difference between the fourth embodiment and the first embodiment is that the driving component 42 of the fourth embodiment is a swing rod mechanism driven by a motor, including a motor 423, four swing rods 434, two connecting rods 436, and three hinge shafts 437. A motor 423 is installed at the left position of the upper frame 1 in the front of the bag discharging mechanism 2. A swing rod 434 is installed on the motor shaft of the motor 423. Hinge holes are respectively arranged in front of and behind the motor shaft, so that the distances between the two hinge holes and the motor shaft of the motor 423 are equal. Three hinge shafts 437 are arranged on the right side of the motor 423. A swing rod 434 is respectively hinged on each hinge shaft 437. Left flap plates 411 are respectively installed at the rear ends of the two left swing rods 434. Right flap plates 412 are respectively installed on the two swing rods 434, so that the two left flap plates 411 respectively correspond to the left ends of the two plastic bags 7, and the two right flap plates 412 respectively correspond to the right ends of the two plastic bags 7. Then the hinge shafts 437 are respectively installed on the frame 1; hinge holes are respectively arranged at the positions of the swing arms 434 behind the hinge shafts 437. Two connecting rods 436 are arranged. One connecting rod 436 is respectively hinged with the two swing arms 434 installed with the right flap plates 412 at the positions of the hinge holes by a pin shaft 435, and the left end of the connecting rod 436 is rotationally connected with the position of the hinge hole in front of the leftmost swing arm 434 by a hinge shaft 437. The other connecting rod 436 is hinged with the left flap plate 411 at the position of the hinge hole by a hinge shaft 437 at the position of the hinge hole behind the leftmost swing arm 434 by a pin shaft 435; when setting the installation positions of the hinge shafts 437, it is advisable that the front and rear positions of each hinge shaft 437 can be consistent with the swing amplitude of the first left flap plate 411 on the left side.

[0036] The working process of the fourth embodiment is as follows: As Figure 8 shown in the figure, in the initial state, the two left flap plates 411 and the two right flap plates 412 are both relatively far away from the left and right ends of the plastic bag 7. When the motor 423 rotates counterclockwise, it can drive the rear connecting rod 436 to move to the right, thereby pushing the two swing rods 434 and the two left flap plates 411 to slap and push the left end of the plastic bag 7 to the right. At the same time, the front connecting rod 436 moves to the left, so that the second and fourth swing rods 434 and the two right flap plates 412 simultaneously slap and push the right end of the plastic bag 7 respectively. When the distance between the left flap plate 411 and the right flap plate 412 is close to the left and right lengths of the plastic bag 7 during the rotation of the motor 423, the motor stops rotating and reverses to reset. At this time, the left and right plastic bags 7 are respectively aligned with the plastic bags 7 discharged behind them, and the work of the fourth embodiment is completed.

[0037] Embodiment Five, as Figure 9As shown, the main difference between the fifth embodiment and the first embodiment is that: the bag-beating mechanism 4 is arranged at a corresponding position behind the bag-discharging mechanism 2, that is, it beats the plastic bags 7 that have been discharged behind the lever mechanism 3; the driving component 42 of the fifth embodiment is a cylinder 421, which also includes a guide rail 414 and a slider 415; and a screw pair 5 is also connected to the cylinder 421.

[0038] like Figure 9 As shown in the figure: a forward and reverse threaded screw rod 51 is rotatably installed at the back of the frame 1, a forward nut 52 and a reverse nut 53 are respectively installed on the forward and reverse threaded screw rod 51, a hand wheel 54 is installed at one end of the forward and reverse threaded screw rod 51, a guide rail 414 is installed in front of the forward and reverse threaded screw rod 51, six sliders 415 are slidably installed on the guide rail 414, a left clapper 411 is respectively installed on the first and fourth sliders 415 from left to right, and a left clapper 411 is installed on the third and sixth sliders A right beater plate 412 is respectively installed on the block 415, the second slider 415 is connected to the positive thread nut 52 by a connecting plate 55, and the fifth slider 415 is connected to the negative thread nut 53 by a connecting plate 55. A cylinder 421 is respectively connected to the left beater plate 411 and the right beater plate 412, and the tails of the two cylinders 421 are respectively installed on the connecting plates 55; the two left beaters 411 are connected by a connecting piece 413, and the two right beaters 412 are also connected by a connecting piece 413.

[0039] The working process of the fifth embodiment is as follows: Figure 9 As shown, the hand wheel 54 is rotated by hand to move the positive thread nut 52 and the negative thread nut 53 to the left and right positions respectively, so that the relative distance between each group of left clapper 411 and right clapper 412 can be adjusted, and the distance between the left clapper 411 and the right clapper 412 (when the cylinder rod of the cylinder 421 is fully retracted) is adapted according to the left and right lengths of the plastic bags 7 to be discharged, and then the two cylinders 421 are opened, that is, in the initial state, the two cylinders 421 are in the state of opening and the cylinder rods are extended. When working, the two cylinders 421 are released at the same time, and the cylinder rods are retracted. The plastic bags 7 are not discharged neatly, and appear to be biased to the left or right. When the left and right cylinders 421 are released at the same time (cylinder rods retract), the left cylinder 421 drives the two left clappers 411 to move to the right at the same time, and the right cylinder 421 drives the right clapper 412 to move to the left at the same time. When the cylinder rods of the two cylinders 421 are fully retracted, the plastic bags 7 are beaten by the left clapper 411 and the right clapper 412 to be adjusted to a state of being neat on the left and right, and then the two cylinders 421 are opened again, and the cylinder rods are respectively extended to reset. At this point, the work of Example 5 is completed.

[0040] Embodiment six, as Figure 10As shown in the figure, the main difference between the sixth embodiment and the first embodiment is that the driving component 42 in the sixth embodiment is four guide rod cylinders 420, and the guide rod cylinders 420 can also be replaced by double rod cylinders or corner cylinders.

[0041] As Figure 10 shown: A guide rod cylinder 420 is installed on each of the left and right sides of the two groups of bag discharging rods 21. The two guide rod cylinders 420 in each group are installed oppositely, and the guide rod seats correspond to each other left and right, that is, one guide rod seat corresponds to the left end of the plastic bag 7, and the other guide rod seat corresponds to the right end of the plastic bag 7. When the two guide rod seats in each group extend towards the middle, their distances are respectively close to the left and right lengths of the plastic bag 7.

[0042] The working process of the sixth embodiment is as follows: As Figure 10 shown, when the four guide rod cylinders 420 are all opened at the same time, the guide rod seats of the two guide rod cylinders 420 in each group respectively pat and push the left and right ends of the plastic bag 7, and respectively push the plastic bag 7 in front to a state where it is aligned with the plastic bag 7 behind, making the left and right sides of the discharged plastic bags 7 neat. This implementation method of the sixth embodiment is relatively simple. The guide rod seat plays the role and effect of the bag patting plate 41, and the cylinder rod and its piston of the guide rod cylinder 420 play the role and effect of the driving component 42. Therefore, the guide rod cylinder 420 combines the functions of the bag patting plate 41 and the driving component 42, and is an integrated design of the bag patting plate 41 and the driving component 42. Although this design method of the sixth embodiment is simple, the adjustment is relatively troublesome. When discharging plastic bags 7 of different specifications and lengths, the positions of each guide rod cylinder 420 need to be moved.

[0043] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0044] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0045] The embodiments of the present utility model described above do not constitute a limitation to the protection scope of the present utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. The bag patting and aligning device for plastic bags, comprising a frame (1), a bag discharging mechanism (2), and a baffle rod mechanism (3), characterized in that: A bag - patting mechanism (4) is also provided at a position corresponding to the front or rear of the bag - arranging mechanism (2). The bag - patting mechanism (4) includes a bag - patting plate (41) and a driving component (42). The bag - patting plate (41) includes a left patting plate (411) and a right patting plate (412). The left patting plate (411) and the right patting plate (412) are connected to the driving component (42). The driving component (42) is a cylinder (421) or a driving module (422).

2. The bag slapping and aligning device for plastic bags according to claim 1, wherein: Two left patting plates (411) and two right patting plates (412) are respectively provided, and a connecting piece (413) is also connected to the two left patting plates (411) and the two right patting plates (412).

3. The bag patting and aligning device for plastic bags according to claim 1, wherein: The driving component (42) is a cylinder (421), and it also includes a guide rail (414) and a slider (415).

4. The bag patting and aligning device for plastic bags according to claim 3, wherein: A lead screw pair (5) is also connected to the cylinder (421).

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