Plastic bag opening device and bag opening method

Abstract

The invention discloses a plastic bag opening device and a bag opening and bagging method. The plastic bag opening device comprises two bag opening assemblies and a bag width adjusting assembly, wherein the two bag opening assemblies are oppositely arranged and used for opening a fabric plastic bag and adjusting the opening height and width, and the bag width adjusting assembly is used for adjusting the distance between the two bag opening assemblies according to the width of the fabric plastic bag. The bag width adjusting assembly is used for adjusting the position of the bag opening assembly according to the width of the fabric plastic bag, the bag blowing assembly is used for blowing open the fabric plastic bag, and the tensioning air cylinder is used for controlling the bag opening assembly to enable a bag opening to be kept in a tensioning state; the bag width adjusting assembly is used for adjusting the position of the bag opening assembly according to the width of the fabric plastic bag; the bag blowing assembly is used for pressing a sealing part of the fabric plastic bag and blowing air into the fabric plastic bag to open the bag opening; the bag opening assembly stretches into a fabric plastic bag and opens a bag opening, the bag opening assembly adjusts the bag opening height according to the fabric height, meanwhile, the tensioning air cylinder controls the bag opening assembly to adjust the bag opening width so that the bag opening can be kept in a tensioned state, and the bag opening can be tensioned through cooperation of the bag opening assembly, the bag width adjusting assembly and the tensioning air cylinder. Different bag opening modes can be selected according to the size proportion of the fabric plastic bag and the fabric.

Description

Technical Field

[0001] The invention relates to the technical field of fabric product packaging equipment, and in particular to a plastic bag supporting device and a bag supporting and filling method. Background Art

[0002] In the sewing product packaging industry, the pre-made bag filling machine is a key equipment, which is responsible for taking out the pre-made bags from the bag silo and conveying them to the bag opening position for bag opening and bagging. As an important part of the pre-made bag filling machine, the bag opening mechanism is used to open the bag. Due to the different opening widths and heights of different bags, the traditional manual bag opening method is not only inefficient but also time-consuming.

[0003] In order to improve the bag opening efficiency and adapt to bags of different sizes, the new servo-controlled bag opening mechanism is designed to meet the bag opening needs of bags of different widths and heights, thereby adapting to the bagging requirements of different products.

[0004] In response to this demand, the authorization announcement number: CN 116891034 A discloses a bag-supporting device, method and system. The device can quickly adjust the spacing between the paddles through the arrangement of a screw mechanism, a drive mechanism and a handle mechanism to achieve rapid opening of bags of different sizes. In addition, the device can also adjust the rotation angle of the paddles to ensure that the bag is stably supported.

[0005] However, the prior art has several limitations. In particular, the distance between the paddles needs to be manually adjusted through a handle mechanism, and the height of the bag cannot be adjusted. The paddles of corresponding height need to be customized according to the height of the fabric, resulting in a limited degree of automation. Moreover, when the bag is supported, the two paddles are rotated outward to support the bag opening, so that the distance between the two paddles must be less than the width of the bag opening, otherwise the bag opening cannot be reliably supported. However, in this structure, when the paddles support the bag opening, the bag opening is limited by the distance between the two paddles after it is opened, and it cannot be tightened, causing the middle section of the bag opening to sag due to gravity, that is, the middle section of the bag opening is in a concave arc shape when the bag opening is opened. Therefore, the width and height of the bag support of the device must be greater than the width and height of the fabric by more than 10% to facilitate the feeding of the fabric into the bag. This makes the packaging bag much larger than the fabric after packaging, that is, the packaging bag is not full enough after packaging, resulting in a large space occupied by the packaging bag when the fabric is stored and transported, and the packaging is not beautiful enough. Therefore, the prior art needs to be further improved. Summary of the invention

[0006] In view of the above-mentioned deficiencies in the prior art, the object of the present invention is to provide a plastic bag stretching device and a bag stretching and bag filling method, which can automatically adjust the bag stretching width according to the width of the fabric plastic bag, and can also adjust the bag stretching height according to the fabric thickness, and keep the bag opening in a tensioned state.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A plastic bag stretching device comprises two bag stretching assemblies which are arranged opposite to each other and are used to stretch open a fabric plastic bag and can adjust the stretching height and width, a bag width adjustment assembly which is used to adjust the distance between the two bag stretching assemblies according to the width of the fabric plastic bag, a bag blowing assembly which is used to blow open the fabric plastic bag, and a tensioning cylinder which is used to control the bag stretching assembly so that the bag opening remains in a tensioned state. The bag width adjustment assembly adjusts the position of the bag stretching assembly according to the width of the fabric plastic bag, and the bag blowing assembly presses the sealing part of the fabric plastic bag and blows air into the fabric plastic bag to open the bag opening. The bag stretching assembly extends into the fabric plastic bag and stretches the bag opening. The bag stretching assembly adjusts the bag stretching height according to the height of the fabric, and the tensioning cylinder controls the bag stretching assembly to adjust the bag stretching width so that the bag opening remains in a tensioned state.

[0009] In the plastic bag supporting device, the bag supporting assembly adjusts the bag supporting height according to the fabric height, specifically comprising: the bag supporting assembly rotates outward and extends into the fabric plastic bag to open the bag opening, and the bag opening is tensioned by the tensioning cylinder, and the width and height of the opened bag opening are respectively greater than the width and height of the fabric to be packaged.

[0010] In the plastic bag stretching device, the bag stretching assembly adjusts the bag stretching height according to the fabric height, specifically comprising: the bag stretching assembly rotates outwardly and extends into the fabric plastic bag to stretch the bag opening to a first height, and at the same time stretches the bag opening to a first width, and the first width is smaller than the width of the fabric to be packaged, and the bag opening is stretched by a tensioning cylinder; when the bag stretching assembly detects that the fabric to be packaged is fed into the fabric plastic bag, and a preset length of the front end of the fabric to be packaged is fed into the fabric plastic bag, the bag stretching assembly lowers the stretched height of the bag opening to a second height, and at the same time the tensioning cylinder stretches the bag opening to a second width and keeps it stretched; wherein the first height is greater than the second height, and the first width is smaller than the second width.

[0011] In the plastic bag holding device, the bag holding assembly includes a bag opening base, a bag opening lower paddle, a bag opening upper paddle, an upper paddle lifting motor, a swinging lower support, a swinging upper support and a bag opening cylinder. The bag opening cylinder is fixed on the bag opening base, the swinging lower support is connected to the movable end of the bag opening cylinder, the bag opening lower paddle is fixedly connected to the swinging lower support, the upper paddle lifting motor is fixedly connected to the bag opening base, the swinging upper support is hinged to the screw nut of the upper paddle lifting motor, and the hinge axis is coaxial with the axis of the swinging lower support, the bag opening upper paddle is fixedly connected to the swinging upper support, and the swinging upper support can be lifted and lowered connected to the guide member on the swinging lower support.

[0012] In the plastic bag holding device, the bag width adjustment component includes a motor, a synchronous shaft, a synchronous slider, a first synchronous belt, a second synchronous belt and a positioning block. The synchronous shaft is connected to the output shaft of the motor through the first synchronous belt, the synchronous slider is sleeved on the synchronous shaft, the positioning block is arranged on the second synchronous belt, the bag opening base is fixed on the positioning block, the tensioning cylinder is fixed on the synchronous slider, and the movable end of the tensioning cylinder is connected to the positioning block.

[0013] In the plastic bag opening device, the bag blowing assembly includes a bag opening blowing plate and a bag opening blowing nozzle, the air inlet ends of the bag opening blowing plate and the bag opening blowing nozzle are both connected to an external air supply device, the bag opening blowing plate is arranged at the front end of the bag opening lower paddle, and the bag opening blowing nozzle is arranged on the rear side of the bag opening lower paddle.

[0014] In the plastic bag supporting device, the bag supporting assembly further comprises a rotation-stopping guide rod, which is fixedly connected to a nut seat of an upper paddle lifting motor and can be lifted and lowered relative to the bag opening base.

[0015] The plastic bag holding device also includes a bag opening detector and an alarm for detecting whether the bag opening is successful. The bag opening detector is arranged on the tensioning cylinder and is used to detect the stroke of the active end of the tensioning cylinder. When the stroke exceeds a preset value, it is determined that the bag opening has failed, and the alarm is sounded.

[0016] A bag-holding and bag-filling method of the above-mentioned plastic bag-holding device, the bag-holding and bag-filling method comprises the following steps:

[0017] The bag width adjustment component adjusts the distance between the two bag support components according to the width of the fabric plastic bag;

[0018] The bag opening and blowing plate of the bag blowing assembly presses the sealing part of the fabric plastic bag, and then the bag blowing assembly blows air to open the bag opening of the fabric plastic bag, and the bag stretching assembly rotates outward and extends into the fabric plastic bag to stretch the bag opening to a first height, and at the same time, the bag opening is stretched to a first width, and the first width is smaller than the width of the fabric, and the bag opening is stretched by the tensioning cylinder;

[0019] When it is detected that the fabric to be packaged is fed into the fabric plastic bag and the preset length of the front end of the fabric is fed into the fabric plastic bag to be packaged, the bag opening component lowers the opening height of the bag to a second height, and the tensioning cylinder simultaneously opens the bag to a second width and keeps the bag tensioned; wherein the first height is greater than the second height, and the first width is less than the second width;

[0020] The tensioning cylinder operates to move the two bag width adjustment components so that the bag opening is continuously kept in a tensioned state.

[0021] A bag-holding and bag-filling method of the above-mentioned plastic bag-holding device, the bag-holding and bag-filling method comprises the following steps:

[0022] The bag width adjustment component adjusts the distance between the two bag support components according to the width of the fabric plastic bag;

[0023] The bag opening and blowing plate of the bag blowing assembly presses the sealing part of the fabric plastic bag, and then the bag blowing assembly blows air to open the bag mouth of the fabric plastic bag, and the bag support assembly rotates outward and extends into the fabric plastic bag to open the bag mouth, and the bag mouth is tensioned by the tensioning cylinder;

[0024] The tensioning cylinder operates to move the two bag width adjustment components so that the bag opening is continuously kept in a tensioned state.

[0025] Compared with the prior art, the plastic bag stretching device and the stretching and bagging method provided by the present invention realize the effective stretching of the fabric plastic bag during the fabric packaging process. These components include two relatively arranged stretching bag components for stretching the fabric plastic bag and capable of adjusting the stretching height and width, a bag width adjustment component for adjusting the spacing between the two stretching bag components according to the width of the fabric plastic bag, a bag blowing component for blowing the fabric plastic bag open, and a tensioning cylinder for controlling the stretching bag component to keep the bag opening in a tensioned state. They work together to adapt to fabric plastic bags and fabrics of different sizes, ensuring the efficiency and beauty of the packaging process. Compared with the prior art, the plastic bag stretching device and the stretching and bagging method of the present invention have significant improvements in improving packaging efficiency and ensuring packaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of the standby state of the plastic bag holding device provided by the present invention.

[0027] Figure 2 This is a schematic structural diagram of the plastic bag opening state of the bag opening device provided by the present invention.

[0028] Figure 3 This is a structural schematic diagram of the plastic bag support device provided by the present invention when the plastic bag is supported to a first height.

[0029] Figure 4 This is a structural schematic diagram of the plastic bag supporting device provided by the present invention when the plastic bag is supported to a second height.

[0030] Figure 5 This is a structural schematic diagram of the first perspective of the bag supporting assembly in the plastic bag supporting device provided by the present invention.

[0031] Figure 6 This is a structural schematic diagram of the bag supporting assembly in the plastic bag supporting device provided by the present invention from a second perspective.

[0032] Figure 7 This is a structural schematic diagram of a bag supporting component and a bag width adjusting component in the plastic bag supporting device provided by the present invention at an angle.

[0033] Figure 8This is a structural schematic diagram of another angle of the bag supporting assembly and the bag width adjusting assembly in the plastic bag supporting device provided by the present invention.

[0034] Description of Reference Numerals

[0035] Fabric plastic bag 100, plastic bag support device 4, bag support assembly 41, bag opening base 411, bag opening lower paddle 412, guide part 4121, bag opening upper paddle 413, upper paddle lifting motor 414, nut seat 4141, swing lower support 415, swing upper support 416, bag opening cylinder 417, anti-rotation guide rod 418, guide member 419, bag width adjustment assembly 42, motor 421, synchronous shaft 422, synchronous slider 423, first synchronous belt 424, second synchronous belt 425, positioning block 426, bag blowing assembly 43, bag opening blowing plate 431, bag support blowing nozzle 432, tensioning cylinder 44, auxiliary slide rail 45, auxiliary slider 46 DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] The plastic bag stretching device and bag stretching and bag filling method provided by the present invention are mainly used for stretching the bag opening during the packaging process of fabrics. The fabrics include but are not limited to clothes, pants, socks, gloves, towels, bedding, etc. The device can select the most suitable bag stretching method according to different fabric plastic bags and fabric sizes through the coordinated work of the bag stretching assembly, the bag width adjustment assembly and the tensioning cylinder. When the fabric plastic bag 1 is much larger than the fabric, the bag stretching assembly will stretch the fabric plastic bag, and the tensioning cylinder will keep the bag stretching assembly in a tensioned state, and then feed the fabric in. If the fabric plastic bag is only slightly larger than the fabric, the bag stretching assembly will first stretch the fabric plastic bag, and then lower the bag stretching height after a small part of the fabric is fed in. The tensioning cylinder is responsible for tensioning the bag opening to widen the bag opening, and finally feed the second half of the fabric in to complete the bag stretching and bag filling. Such a design makes the packaged fabric fuller and more beautiful.

[0038] See also Figure 1 , Figure 2 , Figure 3 and Figure 4The plastic bag stretching device 4 provided by the present invention comprises two bag stretching components 41 which are arranged opposite to each other and are used to stretch open the fabric plastic bag 100 and can adjust the stretching height and width, a bag width adjusting component 42 which is used to adjust the distance between the two bag stretching components 41 according to the width of the fabric plastic bag 100, a bag blowing component 43 which is used to blow open the fabric plastic bag 100, and a tensioning cylinder 44 which is used to control the bag stretching component 41 to keep the bag opening in a tensioned state, wherein the bag width adjusting component 42 adjusts the position of the bag stretching component 41 according to the width of the fabric plastic bag 100, and the bag blowing component 43 adjusts the position of the bag stretching component 41 according to the width of the fabric plastic bag 100, and the bag blowing component 43 adjusts the position of the bag stretching component 41 according to the width of the fabric plastic bag 100, and the bag blowing component 43 adjusts the distance between the two bag stretching components ... The component 43 presses the sealing part of the fabric plastic bag 100 and blows air into the fabric plastic bag 100 to open the bag opening. The bag-stretching component 41 extends into the fabric plastic bag 100 and stretches the bag opening. The bag-stretching component 41 adjusts the bag-stretching height according to the height of the fabric. At the same time, the tensioning cylinder 44 controls the bag-stretching component 41 to adjust the bag-stretching width so that the bag opening remains in a tensioned state. Through the cooperation between the bag-stretching component 41, the bag width adjustment component 42 and the tensioning cylinder 44, different bag-stretching methods can be selected according to the size ratio of the fabric plastic bag 100 to the fabric, which is more practical.

[0039] In the first optional embodiment, the bag support component 41 adjusts the bag support height according to the fabric height, specifically including: the bag support component 41 rotates outward and extends into the fabric plastic bag 100 to open the bag mouth, and the width and height of the bag mouth are respectively greater than the width and height of the fabric to be packaged. After the bag support component 41 is in place, the bag mouth is tightened by the tensioning cylinder 44, that is, the bag mouth is tightened to avoid the middle of the bag mouth from being concave to achieve rapid bag support and bagging. When the bag mouth is tightened, the present invention can further increase the bag support width, so that a plastic bag slightly smaller than the set size can be used, so that the fabric is fuller after packaging. The existing packaging machine bag packaging machine needs to use a packaging bag with a width of 36CM or even larger. Through the first optional embodiment, a packaging bag with a width of only 34CM can be achieved by tensioning the bag mouth.

[0040] In a second optional embodiment, the bag-stretching assembly 41 adjusts the bag-stretching height according to the fabric height, specifically comprising: the bag-stretching assembly 41 rotates outwardly and extends into the fabric plastic bag 100 to stretch the bag opening to a first height, and at the same time stretches the bag opening to a first width, and the first width is smaller than the width of the fabric to be packaged, and the bag opening is stretched by the tensioning cylinder 44; at this time, although the stretched width of the bag opening is smaller than the width of the fabric, due to the restraint and guiding effect of the bag-stretching assemblies 41 on both sides, the front end of the fabric can still smoothly enter the fabric plastic bag 100, and when the bag-stretching assembly 41 detects that the fabric to be packaged is fed into the fabric plastic bag 100, and the preset length of the front end of the fabric to be packaged is fed into the fabric plastic bag 100, the bag-stretching assembly 41 lowers the stretched height of the bag opening to a second height, and at the same time the tensioning cylinder 44 stretches the bag opening to a second width and keeps it stretched; wherein the first height is greater than the second height, and the first width is less than the second width, so as to meet the packaging requirements of a smaller size difference between the fabric plastic bag 100 and the fabric, so as to make the fabric packaging fuller. The existing packaging machine bag packaging machine needs to use a packaging bag with a width of 36CM or even larger. The second optional embodiment can realize a packaging bag with a width of only 32CM or even 30CM by tensioning the bag opening.

[0041] Please also read Figure 5 and Figure 6 The bag support assembly 41 includes a bag opening base 411, a bag opening lower paddle 412, a bag opening upper paddle 413, an upper paddle lifting motor 414, a swing lower support 415, a swing upper support 416 and a bag opening cylinder 417. The bag opening cylinder 417 is fixed on the bag opening base 411, the swing lower support 415 is connected to the movable end of the bag opening cylinder 417, the bag opening lower paddle 412 is fixedly connected to the swing lower support 415, and the upper paddle lifting motor 414 is fixedly connected to the lower support 415. Fixed on the bag opening base 411, the swing upper support 416 is hinged with the screw nut of the upper paddle lifting motor 414, and the hinge axis is coaxial with the axis of the swing lower support 415, the bag opening upper paddle 413 is fixedly connected to the swing upper support 416, and the swing upper support 416 is liftably connected to the guide member 419 on the swing lower support 415, and the guide member 419 plays a role in assisting the upper paddle lifting motor 414 to control the lifting of the swing upper support 416.

[0042] The expansion and contraction of the bag opening cylinder 417 drives the swing lower support 415 to rotate, so that the bag opening lower paddle 412 arranged on the swing lower support 415 rotates synchronously. Since the swing upper support 416 is hinged with the screw nut of the upper paddle lifting motor 414, and the hinge axis is coaxial with the axis of the swing lower support 415, the bag opening upper paddle 413 and the bag opening lower paddle 412 rotate synchronously, and the upper paddle lifting motor 414 can also control the lifting and lowering of the swing upper support 416 to control the height of the bag opening upper paddle 413, and then control the bag support height, so as to be suitable for different fabric packaging. Specifically, the bag opening lower paddle 412 has a guide portion 4121 that facilitates the feeding of the fabric to be packaged, so that the fabric to be packaged can be more smoothly fed into the fabric plastic bag 100.

[0043] In this embodiment, the lower pocket opening paddle 412 is L-shaped, that is, the lower pocket opening paddle 412 includes a transverse piece (not numbered in the figure) and a vertical piece (not numbered in the figure) arranged on the transverse piece, and the guide portion 4121 is arranged on the lower pocket opening paddle 412 (such as on the transverse piece) and is arranged at an obtuse angle to the vertical piece, that is, the guide portion 4121 is opened outward, so that the entrance ends of the two lower pocket opening paddles 412 are trumpet-shaped, so as to facilitate the feeding of folded fabrics.

[0044] When the bag-supporting assembly 41 is used in the first embodiment, the bag-blowing assembly 43 first presses the sealing part of the fabric plastic bag 100, and after the bag-blowing assembly 43 blows up the fabric plastic bag 100, the two swing lower supports 415 control the lower paddles 412 and the upper paddles 413 to rotate outward, so that the lower paddles 412 and the upper paddles 413 extend from the middle of the bag opening of the fabric plastic bag 100 into the fabric plastic bag 100, and when the lower paddles 412 and the upper paddles 413 rotate to be in axial balance with the fabric plastic bag 100, the bag opening is supported, and the bag opening is tightened by the tensioning cylinder 44 to facilitate the feeding of the fabric. When using this first embodiment, the width and height of the bag opening are slightly larger than the width and height of the fabric to be packaged, respectively, to facilitate the feeding of the fabric.

[0045] When the bag-stretching assembly 41 is used in the second embodiment, the sealing portion of the fabric plastic bag 100 is first pressed by the bag-blowing assembly 43. After the bag-blowing assembly 43 blows up the fabric plastic bag 100, the lower swinging support 415 controls the lower bag-opening paddle 412 and the upper bag-opening paddle 413 to rotate outward, so that the lower bag-opening paddle 412 and the upper bag-opening paddle 413 extend into the fabric plastic bag 100 from the middle of the bag opening of the fabric plastic bag 100, and the bag opening is tensioned by the tensioning cylinder 44. At this time, the bag opening is stretched to a first height and a first width, wherein the first width is slightly smaller than the width of the fabric to be packaged, and the first height is higher than the thickness of the fabric to be packaged. The fabric to be packaged can be smoothly fed into the mouth of the fabric plastic bag 100 by using the guiding portion of the lower bag-opening paddle 412. At this time, the two sides of the portion of the fabric to be packaged that is fed into the fabric plastic bag 100 will be slightly tilted. After the bag-stretching assembly 41 detects that the fabric to be packaged has been fed into the fabric plastic bag 100 by a preset distance, the upper paddle lifting motor 414 controls the bag-opening upper paddle 413 to descend to a second height, and at the same time, the bag opening is kept in a tensioned state by the tensioning cylinder 44, so that the bag opening is stretched to a second width. At this time, the second height is smaller than the first height, and the second width is larger than the first width, so that the fabric to be packaged will not curl on both sides after all the fabrics to be packaged are fed into the fabric plastic bag 100. Compared with the first embodiment, the second embodiment can use a smaller fabric plastic bag 100 to package fabrics of the same size (such as clothes), and the fabrics can be fuller and more beautiful after packaging, that is, the packaging is tight, so that the fabrics occupy less space after packaging.

[0046] The bag support assembly 41 further includes a rotation-stopping guide rod 418, which is fixed to the nut seat 4141 of the upper paddle lifting motor 414 and can be lifted and lowered relative to the bag opening base 411, ensuring that the nut seat 4141 of the upper paddle lifting motor 414 drives the swing upper support 416 to perform lifting and lowering movements. Furthermore, the bag support assembly 41 further includes a feeding detector (not shown in the figure), which is used to detect when the fabric to be packaged is fed into the fabric plastic bag 100 to a preset length, such as when the fabric to be packaged is fed into the fabric plastic bag 100 to a quarter of the length, so that the upper paddle lifting motor 414 controls the bag opening upper paddle 413 to descend to a second height.

[0047] The plastic bag opening device 4 also includes a bag opening detector (not shown in the figure) and an alarm (not shown in the figure) for detecting whether the bag opening is successful. The bag opening detector is arranged on the tensioning cylinder 44 and is used to detect the stroke of the active end of the tensioning cylinder 44. When the stroke exceeds a preset value, it is determined that the bag opening fails, and the alarm is sounded. The bag opening detector can be a stroke detection sensor on the tensioning cylinder 44, or a position detection sensor added to the tensioning cylinder 44. During operation, the bag opening is opened by the upper paddle 413 and the lower paddle 412, and then the bag opening of the fabric plastic bag 100 is kept in a tensioned state by the tensioning cylinder 44, at which time the bag opening serves to limit the extension length of the tensioning cylinder 44; when the upper paddle 413 and the lower paddle 412 do not extend into the bag opening of the fabric plastic bag 100, the tensioning cylinder 44 is not limited, and the telescopic rod of the tensioning cylinder 44 will extend all the way to the bag opening detector, and it is determined that the bag opening fails. It is very likely that the plastic bag holding device 4 does not hold the bag, and the alarm is sounded. Of course, the present invention can also be set to perform a second bag opening operation after the first bag opening fails. When the second bag opening operation also fails, the alarm is sounded and waits for the staff to handle it.

[0048] Please also read Figure 7 and Figure 8The bag width adjustment assembly 42 includes a motor 421, a synchronous shaft 422, a synchronous slider 423, a first synchronous belt 424, a second synchronous belt 425, two positioning blocks 426 and a cylinder mounting plate 427. The synchronous shaft 422 is connected to the output shaft of the motor 421 through the first synchronous belt 424. The synchronous slider 423 is sleeved on the synchronous shaft 422 and fixed to the cylinder mounting plate 427. The positioning block 426 is arranged on the second synchronous belt 425. Each of the bag opening bases 411 is fixed to a positioning block 426. The tensioning cylinder 44 is fixed to the cylinder mounting plate 427, and the movable end of the tensioning cylinder 44 is connected to the positioning block 426. Specifically, one positioning block 426 is fixed to one side of the second synchronous belt 425, and the other positioning block 426 is fixed to the same side of the second synchronous belt 425, so that when the second synchronous belt 425 rotates, the two positioning blocks 426 move relative to or oppositely. When adjusting the spacing between the two bag-supporting assemblies 41, the motor 421 drives the synchronous shaft 422 to rotate via the first synchronous belt 424, so that the synchronous slider 423 mounted on the synchronous shaft 422 moves, and the cylinder mounting plate 427 fixed to the synchronous slider 423 and the tensioning cylinder 44 on the cylinder mounting plate 427 move synchronously. Since the movable end of the tensioning cylinder 44 is connected to one of the positioning blocks 426, the second synchronous belt 425 is driven to rotate when the synchronous slider 423 moves, so that the two bag-opening bases 411 fixed on the second synchronous belt 425 move toward or oppositely, thereby adjusting the spacing between the two bag-supporting assemblies 41. After the bag-stretching assembly 41 adjusts the spacing, the motor 421 stops rotating, and the synchronous slider 423 remains in position on the synchronous shaft 422. When the bag-stretching assembly 41 stretches the bag opening, the tensioning cylinder 44 is started, and its movable end pushes one of the positioning blocks 426 (the position of the bag-stretching assembly 41 is controlled by the positioning block 426). Since the positioning blocks 426 are fixed on the second synchronous belt 425, when one of the positioning blocks 426 moves, the second synchronous belt 425 moves synchronously, causing the other positioning block 426 to move in the opposite direction, thereby achieving the purpose of tensioning the bag opening of the fabric plastic bag 100.

[0049] Furthermore, the bag width adjustment component 42 also includes an auxiliary slide rail 45 and an auxiliary slider 46. The cylinder mounting seat 441 and the positioning block 426 are both slidably set on the auxiliary slide rail 45 through the auxiliary slider 46, so that the motor 421 drives the cylinder mounting seat 441 and the positioning block 426 to move more smoothly, and can also reduce the load of the motor 421 and the second synchronous belt 425 to extend the service life of the bag width adjustment component 42.

[0050] Please continue reading Figure 3The bag blowing assembly 43 includes a bag opening blowing plate 431 and a bag opening blowing nozzle 432. The air inlet ends of the bag opening blowing plate 431 and the bag opening blowing nozzle 432 are connected to an external air supply device. The bag opening blowing plate 431 is arranged at the front end of the bag opening lower paddle 412, and the bag opening blowing nozzle 432 is arranged at the rear side of the bag opening lower paddle 412. Before the bag is inflated, the bag opening blowing plate 431 of the bag blowing assembly 43 presses the sealing part of the fabric plastic bag 100, and then the bag opening blowing plate 431 blows air to open the bag mouth of the fabric plastic bag 100, and then the bag opening lower paddle 412 and the bag opening lower paddle 412 rotate outward to open the bag mouth, and at the same time, the bag opening blowing nozzle 432 blows air to inflate the entire fabric plastic bag 100 to Figure 2 The state shown is convenient for feeding the fabric to be packaged.

[0051] Based on the above-mentioned plastic bag holding device 4, the present invention also provides a bag holding and bagging method of the above-mentioned plastic bag holding device 4. In a first optional embodiment, the bag holding and bagging method comprises the following steps:

[0052] The bag width adjustment component 42 adjusts the distance between the two bag support components 41 according to the width of the fabric plastic bag 100;

[0053] The bag opening and blowing plate 431 of the bag blowing assembly 43 presses the sealing portion of the fabric plastic bag 100, and then the bag blowing assembly 43 blows air to open the bag opening of the fabric plastic bag 100, and the bag support assembly 41 rotates outward to extend into the fabric plastic bag 100 and open the bag opening;

[0054] The tensioning cylinder 44 is operated to move the two bag width adjustment components 42 so that the bag openings are continuously kept in a tensioned state, which is convenient for feeding the fabric.

[0055] When the tensioning cylinder 44 detects that the bag opening fails, the bag opening operation can be repeated or an alarm can be sounded by an alarm, waiting for the staff to handle.

[0056] In a second optional embodiment, the bag-holding and bag-filling method comprises the following steps:

[0057] The bag width adjustment component 42 adjusts the distance between the two bag support components 41 according to the width of the fabric plastic bag 100;

[0058] The bag opening and blowing plate 431 of the bag blowing assembly 43 presses the sealing part of the fabric plastic bag 100, and then the bag blowing assembly 43 blows air to open the bag opening of the fabric plastic bag 100, and the bag opening assembly 41 rotates outward to extend into the fabric plastic bag 100 and opens the bag opening to a first height, and at the same time, opens the bag opening to a first width, and the first width is smaller than the width of the fabric, and the bag opening is tightened by the tensioning cylinder 44, and the fabric can be easily fed in by using the guide part of the bag opening lower paddle 412;

[0059] When it is detected that the fabric to be packaged is fed into the fabric plastic bag 100 and the preset length of the front end of the fabric is fed into the fabric plastic bag 100 to be packaged, the bag opening component 41 lowers the opening height of the bag to a second height, and the tensioning cylinder opens the bag to a second width and keeps the bag tensioned; wherein the first height is greater than the second height, and the first width is less than the second width;

[0060] The tensioning cylinder 44 operates to move the two bag width adjustment components 42 so that the bag opening is kept in a tensioned state. When the bag opening component 41 lowers the bag opening to the second height, the tensioning cylinder 44 keeps the bag opening in tension, even if the bag opening is opened to the second width, so that the fabric is easily fed in and the corners will not fold. When the tensioning cylinder 44 detects that the bag opening fails, the bag opening operation can be repeated or the alarm can be sounded for the staff to handle. In this way, the packaged fabric is fuller and more beautiful.

[0061] Both of the above two embodiments can complete the bag opening and bag expansion operations of the fabric plastic bag 100. The specific method can be selected according to the size ratio of the fabric plastic bag 100 and the fabric to achieve the best packaging effect. Since the two bag opening methods have been described in detail above, they will not be repeated here.

[0062] In summary, the present invention provides a plastic bag stretching device and a bag stretching and bag filling method, wherein the plastic bag stretching device realizes the effective stretching of the fabric plastic bag during the fabric packaging process, and these components include a bag stretching component, a bag width adjustment component, a tensioning cylinder, a bag blowing component, and a bag opening detector and an alarm, which work together to adapt to fabric plastic bags and fabrics of different sizes, ensuring the efficiency and beauty of the packaging process.

[0063] Moreover, the bag-holding and bag-filling method of the present invention provides two optional embodiments, and the most suitable method can be selected according to the size ratio of the fabric plastic bag and the fabric, thereby ensuring that the packaged fabric is fuller and more beautiful, and also improving the packaging efficiency and the appearance quality of the product packaging.

[0064] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the claims attached to the present invention.

Claims

1. A plastic bag support device, characterized in that: The invention comprises two bag-stretching assemblies which are arranged opposite to each other and are used to stretch open a fabric plastic bag and can adjust the stretching height and width, a bag width adjusting assembly which is used to adjust the distance between the two bag-stretching assemblies according to the width of the fabric plastic bag, a bag-blowing assembly which is used to blow open the fabric plastic bag, and a tensioning cylinder which is used to control the bag-stretching assembly so that the bag opening is kept in a tensioned state. The bag width adjusting assembly adjusts the position of the bag-stretching assembly according to the width of the fabric plastic bag, and the bag-blowing assembly presses the sealing part of the fabric plastic bag and blows air into the fabric plastic bag to open the bag opening. The bag-stretching assembly extends into the fabric plastic bag and stretches the bag opening. The bag-stretching assembly adjusts the bag-stretching height according to the height of the fabric, and the tensioning cylinder controls the bag-stretching assembly to adjust the bag-stretching width so that the bag opening is kept in a tensioned state.

2. The plastic bag support device according to claim 1, characterized in that: The bag support assembly adjusts the bag support height according to the fabric height, specifically comprising: the bag support assembly rotates outward and extends into the fabric plastic bag to open the bag opening, and the bag opening is tensioned by a tensioning cylinder, and the width and height of the opened bag opening are respectively greater than the width and height of the fabric to be packaged.

3. The plastic bag support device according to claim 1, characterized in that: The bag-stretching assembly adjusts the bag-stretching height according to the fabric height, specifically comprising: the bag-stretching assembly rotates outwardly and extends into the fabric plastic bag to stretch the bag opening to a first height, and at the same time stretches the bag opening to a first width, and the first width is smaller than the width of the fabric to be packaged, and the bag opening is stretched by a tensioning cylinder; when the bag-stretching assembly detects that the fabric to be packaged is fed into the fabric plastic bag, and a preset length of the front end of the fabric to be packaged is fed into the fabric plastic bag, the bag-stretching assembly lowers the stretched height of the bag opening to a second height, and at the same time the tensioning cylinder stretches the bag opening to a second width and keeps it stretched; wherein the first height is greater than the second height, and the first width is smaller than the second width.

4. The plastic bag support device according to claim 1, characterized in that: The bag holding assembly includes a bag opening base, a bag opening lower paddle, a bag opening upper paddle, an upper paddle lifting motor, a swinging lower support, a swinging upper support and a bag opening cylinder. The bag opening cylinder is fixed to the bag opening base, the swinging lower support is connected to the movable end of the bag opening cylinder, the bag opening lower paddle is fixedly connected to the swinging lower support, the upper paddle lifting motor is fixedly connected to the bag opening base, the swinging upper support is hinged to the screw nut of the upper paddle lifting motor, and the hinge axis is coaxial with the axis of the swinging lower support, the bag opening upper paddle is fixedly connected to the swinging upper support, and the swinging upper support is liftably connected to the guide member on the swinging lower support.

5. The plastic bag support device according to claim 4, characterized in that: The bag width adjustment assembly includes a motor, a synchronous shaft, a synchronous slider, a first synchronous belt, a second synchronous belt and a positioning block. The synchronous shaft is connected to the output shaft of the motor through the first synchronous belt, the synchronous slider is sleeved on the synchronous shaft, the positioning block is arranged on the second synchronous belt, the bag opening base is fixed on the positioning block, the tensioning cylinder is fixed on the synchronous slider, and the movable end of the tensioning cylinder is connected to the positioning block.

6. The plastic bag support device according to claim 1, characterized in that: The bag blowing assembly includes a bag opening blowing plate and a bag holding blowing nozzle, the air inlet ends of the bag opening blowing plate and the bag holding blowing nozzle are connected to an external air supply device, the bag opening blowing plate is arranged at the front end of the bag opening lower paddle, and the bag holding blowing nozzle is arranged at the rear side of the bag opening lower paddle.

7. The plastic bag support device according to claim 4, characterized in that: The bag support assembly also includes a rotation-stopping guide rod, which is fixedly connected to a nut seat of the upper paddle lifting motor and can be lifted and lowered relative to the bag opening base.

8. The plastic bag support device according to claim 1, characterized in that: It also includes a bag opening detector and an alarm for detecting whether the bag opening is successful. The bag opening detector is arranged on the tensioning cylinder and is used to detect the stroke of the active end of the tensioning cylinder. When the stroke exceeds a preset value, it is determined that the bag opening has failed, and the alarm is sounded.

9. A method for filling a plastic bag using the plastic bag filling device as claimed in claim 1, characterized in that: The bagging method comprises the following steps: The bag width adjustment component adjusts the distance between the two bag support components according to the width of the fabric plastic bag; The bag opening and blowing plate of the bag blowing assembly presses the sealing part of the fabric plastic bag, and then the bag blowing assembly blows air to open the bag opening of the fabric plastic bag, and the bag stretching assembly rotates outward and extends into the fabric plastic bag to stretch the bag opening to a first height, and at the same time, the bag opening is stretched to a first width, and the first width is smaller than the width of the fabric, and the bag opening is stretched by the tensioning cylinder; When it is detected that the fabric to be packaged is fed into the fabric plastic bag and the preset length of the front end of the fabric is fed into the fabric plastic bag to be packaged, the bag opening component lowers the opening height of the bag to a second height, and the tensioning cylinder simultaneously opens the bag to a second width and keeps the bag tensioned; wherein the first height is greater than the second height, and the first width is less than the second width; The tensioning cylinder operates to move the two bag width adjustment components so that the bag opening is continuously kept in a tensioned state.

10. A method for filling a plastic bag using the plastic bag filling device as claimed in claim 1, characterized in that: The bagging method comprises the following steps: The bag width adjustment component adjusts the distance between the two bag support components according to the width of the fabric plastic bag; The bag opening and blowing plate of the bag blowing assembly presses the sealing part of the fabric plastic bag, and then the bag blowing assembly blows air to open the bag mouth of the fabric plastic bag, and the bag support assembly rotates outward and extends into the fabric plastic bag to open the bag mouth, and the bag mouth is tensioned by the tensioning cylinder; The tensioning cylinder operates to move the two bag width adjustment components so that the bag opening is continuously kept in a tensioned state.

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