A bag-in-bag heat sealing feeding structure

Abstract

The utility model belongs to the field of packaging bag inner bag processing especially is packaging bag inner bag heat -sealing feeding structure, it includes two supports and feeding mechanism, one driven roller is rotatively connected between two supports, one feeding mechanism is equipped between two supports, one packaging bag inner bag is equipped between feeding mechanism and driven roller, feeding mechanism includes sliding block, driving roller, stretch roll, pivot, two support all slidingly connected have sliding block between two sliding blocks, one driving roller is rotatively connected between two sliding blocks, a plurality of recesses no. 1 are set up on driving roller, a plurality of recesses no. 1 all are equipped with stretch roll, a plurality of stretch rolls all are connected with packaging bag inner bag. The utility model discloses through the cooperation of each component not only can realize the effect of automatic feeding to the packaging bag inner bag, but also can avoid the effect that the packaging bag inner bag is deformed by pulling.

Description

Technical Field

[0001] This utility model relates to the field of packaging bag inner bag processing technology, and in particular to a heat-sealing feeding structure for packaging bag inner bags. Background Technology

[0002] Currently, food and pharmaceutical packaging mostly adopts a composite structure, with an outer layer of tensile-resistant woven bag and an inner layer of well-sealed polyethylene plastic bag. The industry commonly uses manual or semi-automatic methods to insert the inner bag into the outer bag, resulting in low efficiency and poor alignment accuracy. In recent years, automated feeding equipment has become increasingly popular, but the inner bag material is soft and easily deformed, prone to stretching and twisting during transport, affecting product quality in subsequent heat-sealing processes. Currently, the mainstream solutions include three types: first, using a vacuum suction cup traction system to transport the inner bag by negative pressure adsorption on its surface; however, polyethylene material has poor air permeability and insufficient adsorption stability. Second, using a gripper robot for clamping and transport; however, improper clamping force control can lead to bag indentation and deformation. Third, using a friction wheel drive; however, the traditional single-roller structure is prone to causing localized stress concentration.

[0003] However, existing technologies generally suffer from uneven stress on the inner bag, leading to tensile deformation, especially at the heat-sealing and cutting station, which can easily cause uneven cuts. Vacuum adsorption carries the risk of air leakage, gripper solutions can produce permanent indentations, and friction wheel conveying can easily slip, affecting subsequent processing. None of these technologies can simultaneously meet the dual requirements of non-destructive conveying and high-precision positioning.

[0004] Therefore, this application proposes a heat-sealing feeding structure for the inner bag of a packaging bag to solve the problems in the prior art. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a heat-sealing feeding structure for the inner bag of a packaging bag.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The inner bag heat-sealing feeding structure for the packaging bag includes two supports and a feeding mechanism;

[0008] The two supports are rotatably connected by the same driven roller, and the two supports are provided with the same feeding mechanism. The feeding mechanism and the driven roller are provided with the same inner bag of the packaging bag.

[0009] The feeding mechanism includes a slider, a drive roller, a fixed plate, a protective plate, a stretching roller, a rotating shaft, a bevel gear one, a bevel gear two, a cylinder, a motor one, and a motor two. Sliders are slidably connected to both brackets, and the same drive roller is rotatably connected between the two sliders two. Both the drive roller and the driven roller are in contact with the inner bag of the packaging bag. The drive roller has multiple grooves one, each containing a stretching roller, which is in contact with the inner bag of the packaging bag. Through the coordinated design of the two brackets, the driven roller, the control panel, and the feeding mechanism, not only can the automatic feeding of the inner bag of the packaging bag be achieved, but the deformation caused by pulling on the inner bag can also be avoided, improving convenience and product quality.

[0010] Specifically, one end of each of the multiple stretching rollers is rotatably connected to the same fixed plate, and the two ends of the fixed plate are respectively fixedly connected to the two sliders. Both the driving roller and the driven roller have an anti-slip layer made of silicone, which increases the friction between the driving roller and the driven roller and the inner bag of the packaging bag, thus preventing slippage during the feeding process.

[0011] Specifically, one end of each of the multiple stretching rollers is rotatably connected to the same protective plate, and the two ends of the protective plate are respectively fixedly connected to the two sliders. The protective plate prevents the inner bag of the packaging bag from contacting the first bevel gear and the second bevel gear.

[0012] Specifically, the two sliders are rotatably connected to the same shaft, and multiple bevel gears are fixedly mounted on the shaft. Each bevel gear is meshed with a bevel gear. One side of each bevel gear is fixedly connected to one end of a multiple stretching roller for transmission, so that the multiple stretching rollers rotate simultaneously. The multiple bevel gears at both ends of the shaft are symmetrical, so that the multiple stretching rollers can gather the inner bag of the packaging bag towards the center or stretch it to both sides during rotation, thereby achieving the effect of adjusting the stretch of the inner bag of the packaging bag.

[0013] Specifically, each of the two brackets is fixedly mounted with a cylinder, and one end of each cylinder is fixedly connected to the two sliders respectively. An adjustable pressure of -MPa can be applied by the action of the cylinder.

[0014] Specifically, a motor is fixedly mounted on one of the two sliders, and the output end of the motor is fixedly connected to one end of the drive roller for driving the drive roller.

[0015] Specifically, a second motor is fixedly mounted on one of the two sliders, and the output end of the second motor is fixedly connected to one end of the rotating shaft for driving the multiple stretching rollers.

[0016] Specifically, a control panel is fixedly installed on one of the two brackets. The second motor, the first motor, and the two cylinders are all connected to the control panel, and the control panel is used to drive and control the two cylinders and the first and second motors.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] The heat-sealing feeding structure for the inner bag of this utility model, through the coordinated design of the two brackets, driven rollers, control panel and feeding mechanism, can not only achieve the effect of automatic feeding of the inner bag of the packaging bag, but also avoid the effect of pulling and deforming the inner bag of the packaging bag, thus improving convenience and product quality. Attached Figure Description

[0019] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary. The structures, proportions, sizes, etc., shown in this specification are only used to complement the content disclosed in the specification for those skilled in the art to understand and read, and are not intended to limit the conditions under which this utility model can be implemented. Therefore, they have no substantial technical significance, and any modification of the structure, change of the proportional relationship, or adjustment of the size is not permitted.

[0020] Figure 1 This is a three-dimensional structural diagram of the heat-sealing and feeding structure for the inner bag of the packaging bag proposed in this utility model.

[0021] Figure 2 This is a rear view schematic diagram of the heat-sealing and feeding structure of the inner bag of the packaging bag proposed in this utility model.

[0022] Figure 3 This is a partial bottom view of the heat-sealing and feeding structure of the inner bag of the packaging bag proposed in this utility model.

[0023] Figure 4 This is a schematic diagram of the feeding mechanism of the heat-sealing feeding structure for the inner bag of the packaging bag proposed in this utility model.

[0024] In the diagram: 1. Support; 2. Slider; 3. Driven roller; 4. Driven roller; 5. Inner bag of packaging bag; 6. Fixing plate; 7. Protective plate; 8. Tension roller; 9. Rotating shaft; 10. Bevel gear one; 11. Bevel gear two; 12. Cylinder; 13. Motor one; 14. Motor two; 15. Control panel. Detailed Implementation

[0025] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0026] Reference Figures 1-4 The inner bag heat-sealing feeding structure of the packaging bag includes two brackets 1 and a feeding mechanism;

[0027] The two supports 1 are rotatably connected by the same driven roller 4, and the two supports 1 are provided with the same feeding mechanism. The feeding mechanism and the driven roller 4 are provided with the same inner bag 5 of the packaging bag. A heat sealing and cutting module is installed 20cm downstream of the feeding roller assembly. The heat sealing and cutting module includes an electric push rod, a nickel-chromium alloy heating plate and a ceramic blade. The nickel-chromium alloy heating plate can preheat the ceramic blade and drive the electric push rod to heat seal and cut the inner bag 5 of the packaging bag. The heat sealing and cutting module is a conventional setting in this field and belongs to the prior art. It can be implemented by those skilled in the art and will not be described in detail.

[0028] The feeding mechanism includes a slider 2, a drive roller 3, a fixed plate 6, a protective plate 7, a stretching roller 8, a rotating shaft 9, a bevel gear 10, a bevel gear 2 11, a cylinder 12, a motor 13, and a motor 2 14. Slider 2 is slidably connected to both brackets 1, and the same drive roller 3 is rotatably connected between the two sliders 2. Both the drive roller 3 and the driven roller 4 are in contact with the inner bag 5 of the packaging bag. The drive roller 3 has multiple grooves 1, and each groove 1 contains a stretching roller 8. All the stretching rollers 8 are in contact with the inner bag 5 of the packaging bag. Through the coordinated design of the two brackets 1, the driven roller 4, the control panel 15, and the feeding mechanism, not only can the effect of automatically feeding the inner bag 5 of the packaging bag be achieved, but the effect of pulling and deforming the inner bag 5 of the packaging bag can also be avoided, thus improving convenience and product quality.

[0029] In this method, one end of multiple stretching rollers 8 is rotatably connected to the same fixed plate 6. The two ends of the fixed plate 6 are respectively fixedly connected to two sliders 2. Both the driving roller 3 and the driven roller 4 have anti-slip layers made of silicone, which increases the friction between the driving roller 3 and the driven roller 4 and the inner bag 5 of the packaging bag, thus preventing slippage during the feeding process.

[0030] In this method, one end of multiple stretching rollers 8 is rotatably connected to the same protective plate 7, and the two ends of the protective plate 7 are respectively fixedly connected to two sliders 2. The protective plate 7 prevents the inner bag 5 of the packaging bag from contacting the bevel gear 10 and bevel gear 21.

[0031] In this method, the two sliders 2 are rotatably connected to the same rotating shaft 9. Multiple bevel gears 10 are fixedly installed on the rotating shaft 9. Each bevel gear 10 is meshed with a bevel gear 21. One side of each bevel gear 21 is fixedly connected to one end of a multiple stretching roller 8 for transmission, so that the multiple stretching rollers 8 rotate simultaneously. The multiple bevel gears 10 at both ends of the rotating shaft 9 are symmetrical, so that the multiple stretching rollers 8 can gather the inner bag 5 of the packaging bag towards the middle or stretch it to both sides during the rotation, thereby achieving the effect of adjusting the stretch of the inner bag 5 of the packaging bag.

[0032] In this method, cylinders 12 are fixedly installed on both brackets 1. One end of each cylinder 12 is fixedly connected to two sliders 2. An adjustable pressure of 0.2-0.5MPa can be applied by the action of the cylinders 12. The pressure applied by the cylinders 12 makes the active roller 3 adapt to the inner bag 5 of packaging bags of different thicknesses, thereby improving the applicability range.

[0033] In this method, a motor 13 is fixedly mounted on one of the two sliders 2. The output end of the motor 13 is fixedly connected to one end of the drive roller 3 to drive the drive roller 3.

[0034] In this method, a motor 14 is fixedly mounted on one of the two sliders 2. The output end of the motor 14 is fixedly connected to one end of the rotating shaft 9 to drive the multiple stretching rollers 8.

[0035] In this method, a control panel 15 is fixedly installed on one of the two brackets 1. The second motor 14, the first motor 13, and the two cylinders 12 are all connected to the control panel 15. The control panel 15 drives and controls the two cylinders 12, the first motor 13, and the second motor 14.

[0036] Working principle: During use, the two cylinders 12 and the first electric motor 13 and the second electric motor 14 are driven and controlled through the control panel 15;

[0037] First, one end of the inner bag 5 of the packaging bag is passed between the driving roller 3 and the driven roller 4. Then, driven by the two cylinders 12, the two sliders 2 slide on the two supports 1 respectively. At the same time, the two sliders 2 drive the driving roller 3 to move synchronously, so that the driving roller 3 and the driven roller 4 clamp the inner bag 5 of the packaging bag. Then, driven by the motor 13, the driving roller 3 rotates and, with the cooperation of the driven roller 4, the inner bag 5 of the packaging bag is conveyed, thereby achieving the effect of feeding.

[0038] During the feeding process of the inner bag 5 of the packaging bag, the rotating shaft 9 can be rotated by the drive of the second motor 14, which will drive multiple bevel gears 10 to rotate synchronously. At the same time, the multiple bevel gears 10 are respectively transmitted with multiple bevel gears 11, which will cause multiple stretching rollers 8 to rotate on the fixed plate 6 and the protective plate 7 and act on the inner bag 5 of the packaging bag, thereby achieving the effect of adjusting the stretch of the inner bag 5 of the packaging bag and avoiding the inner bag 5 of the packaging bag from being pulled and deformed.

[0039] In some specific implementation processes, the cylinder 12 is connected to an external air source via a solenoid valve. The control panel 15 has a built-in pressure sensor and a PID adjustment module. The operator can set a target pressure value of 0.2-0.5 MPa through the human-machine interface of the control panel 15. The pressure sensor collects the output pressure of the cylinder 12 in real time and feeds it back to the control panel 15. After calculation by the PID algorithm, a control signal is output to adjust the opening of the solenoid valve, forming a closed-loop pressure control. This allows the clamping force of the active roller 3 and the driven roller 4 on the inner bag 5 of the packaging bag to automatically adapt to the thickness of the inner bag material. When the inner bag is a 0.05 mm thick polyethylene film, the cylinder pressure is automatically adjusted to 0.3 MPa, which ensures sufficient friction to prevent slippage (friction coefficient ≥ 0.6) and avoids permanent indentations on the bag surface due to excessive pressure (such as exceeding 0.6 MPa), thus solving the indentation defects of the gripper solutions in the background technology.

[0040] An infrared beam sensor is fixedly installed on the side of the bracket 1 located 20cm downstream of the feeding mechanism. Figure 1 (Not shown), its transmitter and receiver are located on opposite sides of the conveying path of the inner bag 5 of the packaging bag. When the bag is conveyed by the active roller 3 to the sensor sensing area (sensing accuracy ±0.2mm), the sensor sends a positioning electrical signal to the control panel 15, triggering the following linkage control process: First, the motor 13 pauses its drive, causing the active roller 3 to stop rotating. At the same time, the electric push rod drives the nickel-chromium alloy heating element to heat at 220℃ for 3 seconds. After the temperature sensor detects that the surface temperature of the ceramic blade reaches 200℃±10℃, the electric push rod pushes the blade at a constant speed of 5mm / s to heat-seal and cut the bag. The distance error between the cutting position and the sensor sensing point is controlled within ±0.5mm. This closed-loop control mechanism solves the problem of uneven cuts caused by inaccurate conveying positioning in the background technology. Compared with the traditional mechanical limiting method, the positioning accuracy is improved by more than 3 times.

[0041] The outer circumferential surface of the stretching roller 8 is vulcanized with a rubber layer of Shore hardness 50A, and the surface is uniformly distributed with trapezoidal protrusions of 0.4 mm in height and 2 mm in spacing. Figure 4The contact area of ​​a single protrusion is 0.8 mm², allowing the contact pressure between each stretching roller 8 and the bag body to be adjusted between 1-5 N / mm². When the motor 2 14 drives the rotating shaft 9 to rotate, the symmetrically distributed bevel gears 10 and 11 (transmission ratio 1:1) drive the stretching rollers 8 on both sides to rotate in opposite directions at a speed of 10-30 r / min, forming a converging force towards the center of the bag body or a stretching force towards both sides. A torque sensor (accuracy ±0.1 N·m) installed at the end of the rotating shaft 9 monitors the stretching torque in real time. When the stretching force in a certain area exceeds 5 N / mm², the control panel 15 automatically adjusts the speed of the motor 2 14 to keep the lateral force uniformity of the bag body within ±5%, completely solving the problem of local stress concentration caused by the traditional single-roller structure in the background technology.

[0042] The fixing plate 6 is made of 4mm thick aluminum alloy sheet, with 8mm diameter mounting holes machined at both ends. It is fastened to the threaded holes on the side of the slider 2 using M6×20 stainless steel bolts with a bolt spacing of 50mm and anti-loosening washers. During installation, a precision level is used to ensure that the parallelism error between the fixing plate 6 and the axis of the drive roller 3 is ≤0.2mm. This ensures that the gap between the stretch roller 8 and the bottom surface of the groove of the drive roller 3 is uniform (the gap value is adjustable from 0.5-1mm, controlled by the cylinder pressure and the stroke of the slider 2). This guarantees that the pressure deviation at each contact point of the bag during the conveying process does not exceed 3%, avoiding uneven stress caused by mechanical structural deviations.

[0043] The motor 13 is a servo motor with a rated torque of 2 N·m. Its output end is connected to the shaft of the drive roller 3 via a TL6 type flexible coupling. The coupling allows a radial deviation of ≤0.1 mm and an angular deviation of ≤1°, effectively compensating for machining and installation errors. The silicone anti-slip layer on the surface of the drive roller 3 is 2 mm thick (Shore hardness 60A), and the driven roller 4 uses the same anti-slip layer. The friction drive system formed by these two components exhibits a speed fluctuation of ≤±2% within a conveying speed range of 0.5-2 m / min. When the conveying speed is 1 m / min, the measured linear velocity uniformity of the bag surface has an error of ≤0.3%, completely solving the slippage problem of friction wheel conveying in the background technology. Compared with the traditional single-roller conveying scheme, the conveying stability is improved by more than 60%.

[0044] This structure utilizes a dual-roller friction drive (contact width occupies 85% of the bag width) between the active roller 3 and the driven roller 4, combined with six sets of tension rollers 8 evenly distributed along the bag width direction, forming a composite conveying mechanism of "multi-point contact + lateral tension adjustment". Unlike the vacuum adsorption (relying on material permeability) and gripper holding (relying on mechanical contact force) in the prior art, this solution addresses the problems of existing technologies in the following ways:

[0045] To address the risk of air leakage during vacuum adsorption, the negative pressure adsorption structure is completely abandoned. Stable delivery is achieved by relying on the physical friction of the silicone anti-slip layer (friction coefficient 0.65±0.05). Even for polyethylene film with extremely poor air permeability, it can maintain a stable driving force of ≥10N (the measured air leakage rate is 0).

[0046] To address the issue of gripper indentation: a non-contact stretch roller 8 is used to adjust the bag tension. The contact pressure of the rubber protrusions on the stretch roller is ≤5N / mm², which is only 1 / 4 of the gripping pressure of traditional grippers (≥20N / mm²). According to tests conducted by a third-party testing agency, the depth of residual indentations on the bag surface is ≤0.01mm (invisible to the naked eye), meeting the requirements for non-destructive transport of food and pharmaceutical packaging.

[0047] To address stress concentration on a single roller, six symmetrically distributed tension rollers (30mm apart) divide the bag into multiple stress zones laterally. The tensile force deviation in each zone is controlled within ±5%. Combined with adaptive cylinder pressure adjustment, the uniformity of longitudinal traction force on the bag is increased to over 95%. High-speed camera observation shows that the lateral deformation of the bag during transport is ≤0.3mm, significantly better than the 2mm deformation index of existing technologies.

[0048] The technological advancements of this invention compared to existing technologies are as follows: through the cooperation of various components, not only can the automatic feeding of the inner bag 5 of the packaging bag be achieved, but the deformation of the inner bag 5 of the packaging bag can also be avoided, thus improving convenience and product quality. Moreover, the structure is simple and the practicality is higher.

Claims

1. A bag-in-bag heat-seal feeding structure, characterized by comprising: It includes two supports (1) and a feeding mechanism; The two supports (1) are rotatably connected by the same driven roller (4), and the two supports (1) are provided with the same feeding mechanism. The feeding mechanism and the driven roller (4) are provided with the same inner bag (5). The feeding mechanism includes a slider (2), an active roller (3), a fixed plate (6), a protective plate (7), a stretching roller (8), a rotating shaft (9), a bevel gear one (10), a bevel gear two (11), a cylinder (12), a motor one (13), and a motor two (14). The two brackets (1) are slidably connected to the sliders (2), and the two sliders two are rotatably connected to the same active roller (3). The active roller (3) and the driven roller (4) are both in contact with the inner bag (5) of the packaging bag. The active roller (3) has multiple grooves one, and each of the multiple grooves one is provided with a stretching roller (8). The multiple stretching rollers (8) are all in contact with the inner bag (5) of the packaging bag.

2. The bag-in-bag heat-seal feed structure according to claim 1, characterized by, One end of each of the multiple stretching rollers (8) is rotatably connected to the same fixed plate (6), and the two ends of the fixed plate (6) are respectively fixedly connected to the two sliders (2). Both the driving roller (3) and the driven roller (4) have anti-slip layers.

3. The bag-in-bag heat-seal feed structure according to claim 2, characterized by, One end of each of the multiple stretching rollers (8) is rotatably connected to the same protective plate (7), and the two ends of the protective plate (7) are respectively fixedly connected to the two sliders (2).

4. The bag-in-bag heat-seal feed structure according to claim 3, characterized by The two sliders (2) are rotatably connected to the same shaft (9), and multiple bevel gears (10) are fixedly installed on the shaft (9). Each of the multiple bevel gears (10) is meshed with a bevel gear (11), and one side of each of the multiple bevel gears (11) is fixedly connected to one end of each of the multiple stretching rollers (8).

5. The bag-in-bag heat-seal feed structure according to claim 1, characterized by, A cylinder (12) is fixedly installed on each of the two brackets (1), and one end of each cylinder (12) is fixedly connected to the two sliders (2).

6. The bag-in-bag heat-seal feed structure according to claim 5, wherein One of the two sliders (2) is fixedly mounted with a motor (13), and the output end of the motor (13) is fixedly connected to one end of the drive roller (3).

7. The bag-in-bag heat-seal feed structure according to claim 6, characterized by One of the two sliders (2) is fixedly mounted with a second motor (14), and the output end of the second motor (14) is fixedly connected to one end of the rotating shaft (9).

8. The bag-in-bag heat-seal feed structure according to claim 7, characterized by A control panel (15) is fixedly installed on one of the two brackets (1), and the second motor (14), the first motor (13) and the two cylinders (12) are all connected to the control panel (15).

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