An air flotation bag opening device

Abstract

This invention provides an air-floating bag opening straightening device, which solves the problems in existing technologies where friction occurs between the bag opening and the protective plate during bag opening straightening, or where the bag conveying speed is difficult to match with the belt speed of the bag folding machine, easily leading to wrinkles, detachment, or deformation of the bag opening, resulting in poor folding effect. The device is installed on the upper side of the bag folding machine and includes a fixed base, two rotating shafts, two swing frames, a drive assembly, and two air blowing assemblies. The two rotating shafts are rotatably connected to the fixed base; the two swing frames are fixedly connected to the two rotating shafts respectively; the drive assembly is disposed on the two rotating shafts; the two air blowing assemblies are respectively located below the two swing frames and fixedly connected to the swing frames; a second gap is provided between the two air blowing assemblies for the bag to pass through, and a first gap is provided between the two swing frames, the first gap being larger than the second gap; the two air blowing assemblies blow air into the second gap respectively.

Description

Technical Field

[0001] This invention relates to a packaging device for packaging bags, specifically to an air flotation bag opening device. Background Technology

[0002] During the process of conveying packaging bags to the packaging bag folding machine, the bag opening is prone to tipping over, so it needs to be straightened. In existing technology, the bag opening is usually straightened by using two fixed guard plates with a fixed distance between them or by a motor-driven belt to clamp the upper edge of the packaging bag. However, due to the friction between the guard plate and the packaging bag, and the difficulty in matching the speed of the motor-driven belt with the conveying speed of the packaging bag, friction between the belt and the bag opening is caused, which easily leads to wrinkles or detachment of the bag opening. When the smooth surfaces on both sides of the packaging bag are inconsistent, the friction is small on one side and large on the other, which can easily cause the formed bag opening to deform, ultimately resulting in a poor folding effect.

[0003] In summary, existing technologies for straightening the opening of packaging bags can cause friction between the bag opening and the protective plate, or the conveying speed of the packaging bag may not match the running speed of the belt on the bag folding machine. This can easily lead to wrinkles, detachment, or deformation of the bag opening, resulting in poor folding effect. Summary of the Invention

[0004] The purpose of this invention is to solve the problems in the prior art where friction occurs between the bag opening and the protective plate when straightening the bag opening, or where the conveying speed of the bag is difficult to match with the running speed of the belt on the bag folding machine, which easily leads to wrinkles, detachment or deformation of the bag opening, resulting in poor folding effect of the bag opening. Therefore, this invention provides an air flotation bag opening straightening device.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] An air-floating bag opening straightening device, installed on a packaging bag folding machine, is used to straighten the bag opening during packaging bag folding. Its special feature is that:

[0007] It includes a fixed base installed on the upper part of the packaging bag folding machine, two rotating shafts, two swing frames, a drive assembly, and two air blowing assemblies;

[0008] The two rotating shafts are rotatably connected to the fixed base;

[0009] The upper ends of the two swing frames are respectively fixedly connected to two rotating shafts;

[0010] The drive assembly is connected to the two rotating shafts and is used to drive the two rotating shafts to rotate, thereby causing the two swing frames to move closer or further apart.

[0011] The two air blowing components are respectively located below the two swing frames and are fixedly connected to the swing frames;

[0012] A second gap is provided between the two air blowing components to allow the packaging bag to pass through, and a first gap is provided between the two swing frames, with the first gap being larger than the second gap;

[0013] The two air blowing components blow air into the second gap respectively, and the airflow straightens the opening of the packaging bag to prevent the opening of the packaging bag from being mismatched with the conveying speed of the folding machine due to the presence of friction.

[0014] Furthermore, the air blowing assembly includes an air blowing plate, a first connecting plate attached to the upper side of the air blowing plate, and a second connecting plate attached to the lower side of the air blowing plate;

[0015] The blowing plates of the two blowing assemblies each have a plurality of blowing holes on their adjacent sides, and the plurality of blowing holes are arranged along the length of the blowing plates.

[0016] The air blowing plate has an air guiding groove along its length, and the air blowing holes are all connected to the air guiding groove.

[0017] The air guide groove is provided with a connection hole for connecting to an external air source to provide the gas needed to straighten the opening of the packaging bag.

[0018] Furthermore, the opening direction of the air blowing hole is at an angle to the conveying direction of the packaging bag, so that the opening of the packaging bag is suspended along its conveying direction.

[0019] Furthermore, the included angle ranges from 10 to 20°.

[0020] Furthermore, the air blowing hole is a conical hole, and the large end of the air blowing hole is connected to the air guide groove.

[0021] Furthermore, the small end diameter of the air blowing hole is 0.5-3mm.

[0022] Furthermore, each of the two air-blowing plates has a notch on the side closest to each other at the end away from the fixed base. The size of the opening of the notch gradually decreases along the conveying direction of the packaging bag, which facilitates the entry of the packaging bag opening between the two air-blowing plates.

[0023] Furthermore, the drive assembly includes an air-float bag-forming cylinder, two synchronous gears respectively fixedly connected to one end of the two rotating shafts, and two connecting frames;

[0024] The two synchronizing gears mesh with each other;

[0025] One end of each of the two connecting frames is fixed to one of the two rotating shafts. The other end of one connecting frame is hinged to the fixed end of the air flotation bag cylinder, and the other end of the other connecting frame is hinged to the moving end of the air flotation bag cylinder. The two rotating shafts can be driven synchronously by the above-mentioned drive assembly. The structure is simple and the control is stable.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] In this invention, during the process of conveying the packaging bag to the packaging bag folding machine, gas is supplied by an external air source. Then, through the air guide grooves and conical holes on the two air blowing components, the gas can be blown in the conveying direction of the packaging bag opening, so that the packaging bag opening is suspended in the conveying direction and adapts to the conveying speed of the packaging bag. In this way, the gas straightens the packaging bag opening, and there is no friction, thereby ensuring that the shape of the packaging bag opening is maintained before folding and improving the folding effect. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of an embodiment of the air flotation bag opening device of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the driving component in an embodiment of the air flotation bag opening device of the present invention;

[0030] Figure 3 This is a cross-sectional view of the air blowing plate in an embodiment of an air flotation bag opening device of the present invention.

[0031] In the figure, 1-air flotation bag opening device, 11-fixed base, 12-rotating shaft, 13-swing frame, 14-drive assembly, 141-air flotation bag opening cylinder, 142-synchronous gear, 143-connecting frame, 15-air blowing assembly, 151-air blowing plate, 152-first connecting plate, 153-second connecting plate, 154-air blowing hole, 155-air guide groove. Detailed Implementation

[0032] To make the objectives, advantages, and features of the present invention clearer, the following detailed description of an air-floating bag-forming device proposed by the present invention, in conjunction with the accompanying drawings and specific embodiments, will further clarify the advantages and features of the present invention. The advantages and features of the present invention will become clearer from the following specific embodiments.

[0033] In the description of this invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] like Figures 1-3 As shown, this invention provides an air-floating bag opening straightening device, installed on the upper side of a packaging bag folding machine. When the packaging bag is conveyed to the packaging bag folding machine, the bag opening can be straightened using air. Figure 1 (The direction of the middle arrow indicates the conveying direction of the packaging bag) The air flotation bag straightening device 1 includes a fixed base 11, two rotating shafts 12, two swing frames 13, a drive assembly 14, and two air blowing assemblies 15. The two rotating shafts 12 are rotatably connected to the fixed base 11, and the axes of the two rotating shafts 12 are both along the conveying direction of the packaging bag. The two rotating shafts 12 are symmetrically arranged about the center line of the fixed base 11 along the conveying direction of the packaging bag. The two swing frames 13 are fixedly connected to the two rotating shafts 12 respectively. The drive assembly 14 is connected to the two rotating shafts 12, and drives the two rotating shafts to rotate in opposite directions, thereby causing the lower ends of the two swing frames 13 to move closer or further apart. The two air blowing assemblies 15... Located below and fixedly connected to the two swing frames 13, the fixed connection in this embodiment is a bolt connection, but it can also be achieved by adhesive bonding, welding, or other methods found in the prior art. A second gap is provided between the two air blowing components 15 for the packaging bag to pass through, and a first gap is provided between the two swing frames 13, with the first gap being larger than the second gap. The two air blowing components 15 blow air into the second gap respectively. When the packaging bag is conveyed into the range of the air blowing components, the conveying speed of the packaging bag is adaptively adjusted by blowing air into the second gap. This allows the air to straighten the opening of the packaging bag, while eliminating friction, thereby ensuring the shape of the packaging bag opening is maintained before folding and improving the folding effect.

[0035] The air blowing assembly 15 includes an air blowing plate 151, a first connecting plate 152 attached to the upper side of the air blowing plate 151, and a second connecting plate 153 attached to the lower side of the air blowing plate 151. The first connecting plate 152 is made of PE material, and the second connecting plate 153 is made of aluminum. Each air blowing plate 151 of the two air blowing assemblies 15 has several air blowing holes 154 on its adjacent side, arranged along the length of the air blowing plate 151. The air blowing plate 151 has an air guide groove 155 along its length, and the air blowing holes 154 communicate with the air guide groove 155. The air guide groove 155 has connecting holes for connecting to an external air source. In this embodiment, the air source is an air pump connected to the output end of the air pump via a connecting pipe. A three-way pipe is connected to the input end of the connecting pipe, and the two output ends of the three-way pipe are connected to the input end of the air pump. The ends are respectively connected to guide pipes, and the ends of the two guide pipes are connected to the connecting holes on the two air blowing components 15 to complete the gas delivery; the opening direction of several air blowing holes 154 is along the conveying direction of the packaging bag and has an angle with the conveying direction, the angle is acute, and the angle range is 10-20°. The air blowing holes 154 are conical holes, and the length of the air blowing holes 154 ranges from 80-100mm. The large end of the air blowing hole 154 is connected to the air guide groove 155, and the small end of the air blowing hole 154 has a diameter of 0.5-3mm, preferably 2mm in this embodiment. If the small end of the air blowing hole 154 is too small, the air pressure will be insufficient and the bag opening cannot be kept suspended; if the small end of the air blowing hole 154 is too large, the air pressure will be too large, which will affect the suspension state and make it difficult to keep synchronized with the folding machine.

[0036] The drive assembly 14 includes an air-floating bag-forming cylinder 141, two synchronous gears 142 respectively fixedly connected to one end of two rotating shafts 12, and two connecting brackets 143; the two synchronous gears 142 mesh with each other; one end of each of the two connecting brackets 143 is radially fixed to the two rotating shafts 12, the other end of one connecting bracket 143 is hinged to the fixed end of the air-floating bag-forming cylinder 141, and the other end of the other connecting bracket 143 is hinged to the moving end of the air-floating bag-forming cylinder 141. When the air-floating bag-forming cylinder 141 is in the retracted state, the two connecting brackets 143 rotate through the synchronous gears, and the two air-blowing components... The spacing between the two air blowing components 15 increases (the gap changes through swinging, facilitating the feeding of the packaging bag), the packaging bag enters the air blowing component 15, the air flotation bag cylinder 141 extends, and the synchronous spacing between the two air blowing components 15 decreases, making it easier for the packaging bag to be shaped at the bag opening through air flotation. It should be noted that the structure of the drive component 14 used in this embodiment is only a preferred solution. When implementing this, those skilled in the art can also use other drive structures in the prior art that can satisfy the requirement that the rotating shaft 12 can rotate within a certain range, so that the range of the two swing frames 13 approaching or separating from each other meets the needs of the packaging bag conveying.

[0037] To further facilitate the entry of the packaging bag between the two air blowing assemblies 15, notches are provided on the side of each air blowing plate 151 that is close to each other at the end away from the mounting base 11, and the size of the opening of the notch gradually decreases along the conveying direction of the packaging bag.

[0038] During operation, when the packaging bag is conveyed to the range of the air blowing plate 151, the air-floating bag-integrating cylinder 141 extends, driving the two rotating shafts 12 to rotate simultaneously via the synchronous gear 142. This reduces the gap between the lower ends of the two swing frames 13, causing the two air blowing plates 151 to move closer to each other until they reach a position close to the opening of the packaging bag but without physical contact (because the gas flow rate decreases along the flow direction, a closer distance ensures the air-floating effect and reduces energy consumption). The gas supplied by the external air source is guided by the air guide groove 155 and blown out through the air blowing hole 154 along the conveying direction of the packaging bag. The airflow straightens the opening of the packaging bag and keeps it suspended along the conveying direction of the packaging bag under the action of the airflow, adapting to the conveying speed of the packaging bag and avoiding friction that could deform the bag opening and affect the folding effect. After the opening of a packaging bag is folded, the air-floating bag-integrating cylinder 141 shortens, increasing the gap between the two air blowing components 15, which facilitates the next folding operation.

Claims

1. An air-floating bag opening device, installed on a packaging bag folding machine, characterized in that: It includes a fixed base (11) installed on the upper end of the packaging bag folding machine, two rotating shafts (12), two swing frames (13), a drive assembly (14), and two air blowing assemblies (15); The two rotating shafts (12) are rotatably connected to the fixed base (11); The upper ends of the two swing frames (13) are respectively fixedly connected to two rotating shafts (12); The drive assembly (14) is connected to the two rotating shafts (12) and is used to drive the two rotating shafts (12) to rotate, thereby causing the two swing frames (13) to move closer or further apart; The two air blowing assemblies (15) are respectively located below the two swing frames (13) and are fixedly connected to the swing frames (13); A second gap is provided between the two air blowing assemblies (15) for the packaging bag to pass through, and a first gap is provided between the two swing frames (13), and the first gap is larger than the second gap; The two air blowing assemblies (15) blow air into the second gap respectively; the air blowing assembly (15) includes an air blowing plate (151), a first connecting plate (152) closely attached to the upper side of the air blowing plate (151), and a second connecting plate (153) closely attached to the lower side of the air blowing plate (151); The two air blowing assemblies (15) each have a plurality of air blowing holes (154) on the side of the air blowing plates (151) that are close to each other, and the plurality of air blowing holes (154) are arranged along the length of the air blowing plates (151). The air blowing plate (151) has an air guiding groove (155) along its length direction, and a plurality of air blowing holes (154) are connected to the air guiding groove (155). The air guide groove (155) is provided with a connection hole for connecting to an external air source; The air blowing hole (154) is a conical hole, and the large end of the air blowing hole (154) is connected to the air guide groove (155); The opening direction of the air blowing hole (154) is at an angle to the conveying direction of the packaging bag, and the small end diameter of the air blowing hole (154) is 0.5-3mm.

2. The air flotation bag opening device according to claim 1, characterized in that: The included angle is 10-20°.

3. The air flotation bag opening device according to claim 2, characterized in that: Both of the two air-blowing plates (151) have notches on the side closest to each other at the end away from the fixed seat (11), and the size of the opening of the notches gradually decreases along the conveying direction of the packaging bag.

4. The air flotation bag opening device according to any one of claims 1-3, characterized in that: The drive assembly (14) includes an air-float whole bag cylinder (141), two synchronous gears (142) respectively fixedly connected to one end of the two rotating shafts (12), and two connecting frames (143); The two synchronizing gears (142) mesh with each other; One end of each of the two connecting frames (143) is fixed on one of the two rotating shafts (12). The other end of one of the connecting frames (143) is hinged to the fixed end of the air flotation bag cylinder (141), and the other end of the connecting frame (143) is hinged to the moving end of the air flotation bag cylinder (141).

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