A device and method for twisting and unwinding a packaging bag after packaging

Abstract

The application discloses a kind of twist after packaging bag packaging and method, device includes being set on packaging line transmission frame, conveying belt is set on the transmission frame, conveying belt one side is provided with the mechanism of turning body and packing, the mechanism of turning body and packing includes four dial arms, four dial arms horizontal 90 degrees angle evenly distributed and fixed on a rotating shaft, dial arm is horizontally curved and arranged, a stepping servo motor drives rotating shaft rotation, a sensor is passed through induction vertical packaging bag by controller and is started by stepping servo motor rotating shaft rotation, rotating rotating shaft drives four dial arms with sensor signal from conveying belt above with 90 degrees corner as one time sequentially rotates and scans, the vertical packaging bag is placed on the dial arm and after being adjacent dial arm with it and is clamped 90 degrees and is pushed down after being rotated.The application packs work mode simply, and effect is obvious, and structure is simple, and cost is low.

Description

Technical Field

[0001] This invention relates to the field of packaging, and more particularly to a device and method for twisting and turning a packaged bag after it has been sealed. Background Technology

[0002] Currently, most bag packaging machines on the market (including automatic, semi-automatic, and manual models) produce finished packages that are conveyed upright. After being conveyed upright, a reversing device is needed at the rear to push the bag packages onto the conveyor belt. However, there is currently a gap between the reversing mechanism and the main body of the packaging machine. The bag packages pass through this gap before being reversed by the reversing mechanism. Because of the transition gap at the connection point between the reversing mechanism and the main body of the packaging machine, the packages are prone to tilting and falling over at this transition gap, resulting in a high reversing failure rate. Furthermore, the independent reversing mechanism has a complex structure and high cost. Summary of the Invention

[0003] The purpose of this invention is to provide a device and method for twisting and turning packaging bags after sealing, which addresses the above-mentioned problems. By adding a twisting and turning mechanism next to the conveyor belt, the vertically passing packaging bags are turned and tilted into the connecting conveyor belt by the arc-shaped bending actuating arm of the twisting and turning mechanism.

[0004] To achieve the above objectives, the solution of the present invention is as follows:

[0005] A twisting and reversing device for sealed packaging bags includes a transmission frame mounted on a packaging line. A conveyor belt is mounted on the transmission frame, and a packaging bag sealing machine on the packaging line is placed on the conveyor belt. Vertical packaging bags entering from the input end of the conveyor belt are sealed by the packaging bag sealing machine and then continue to be conveyed forward by the conveyor belt. Along the direction of movement of the conveyor belt, after passing the packaging bag sealing machine, a twisting and reversing mechanism is mounted on one side of the conveyor belt on the transmission frame. The twisting and reversing mechanism includes four actuating arms, which are evenly distributed horizontally at 90-degree angles and fixed on a rotating shaft. The actuating arms are horizontally curved. A stepper servo motor drives the rotating shaft to rotate, and a sensor is activated by a controller by sensing the passing vertical packaging bags. A stepper servo motor drives a rotating shaft to rotate. The stepper servo motor has a grating sensor at its tail end. The controller controls the rotation of the actuating arm through the grating sensor. In the initial state, one of the four actuating arms is placed on the conveyor belt, and the two adjacent actuating arms are placed on the front and rear sides of the conveyor belt. The length direction of the actuating arm placed on the conveyor belt is perpendicular to the movement direction of the conveyor belt. The curved outer convex surface of the actuating arm faces the upright packaging bag moving on the conveyor belt. The rotating shaft drives the four actuating arms to rotate sequentially across the conveyor belt at 90-degree angles according to the sensor signal. The upright packaging bag is clamped and rotated 90 degrees by the actuating arm placed on the conveyor belt and its adjacent actuating arms and then pushed over.

[0006] A further step in the solution is that the linear velocity of the rotating arm sweeping across the conveyor belt is greater than the linear movement speed of the conveyor belt, thereby enabling the upright packaging bag to be pushed over by the rotating arm after rotating 90 degrees.

[0007] A further aspect of the solution is that the linear velocity of the rotating sweeping arm is 1.2 to 2.5 times the linear speed of the conveyor belt.

[0008] A further aspect of the solution is that the sensor is either a position sensor or a pressure sensor. The position sensor is mounted on the transmission frame to sense the arrival of the upright packaging bag, and the pressure sensor is mounted on the curved outer convex surface of the actuating arm. When the upright packaging bag touches the curved outer convex surface of the actuating arm, a signal is emitted.

[0009] A further aspect of the solution is that the height of the actuating arm above the conveyor belt is one-quarter to one-third the height of the vertically oriented packaging bag.

[0010] A further aspect of the solution is that the straight length of the agitator arm is equal to the width of the conveyor belt, and the bending setting ensures that when the agitator arm stops rotating 90 degrees, the vertically positioned packaging bag being agitated also rotates exactly 90 degrees.

[0011] A method for twisting and overturning a packaged bag after sealing, based on the above-mentioned device, involves activating a stepper servo motor after a sensor detects the upright packaging bag. The method controls a toggle arm to rotate 90 degrees from the side of the conveyor belt as the starting point and then stop. The stepper servo motor's speed is adjusted from slow to fast starting from the starting point. The adjustment process is as follows: first, the starting speed of the stepper servo motor is determined according to the rotation speed of the conveyor belt; then, the speed of the stepper servo motor is adjusted according to the rotation angle of the toggle arm. The stepper servo motor stops rotating when the toggle arm reaches 90 degrees. Furthermore, this speed adjustment generates a thrust when the toggle arm rotates to 90 degrees, which pushes the upright packaging bag over as the toggle arm rotates to 90 degrees.

[0012] The solution further includes: the speed adjustment is staged. When the toggle arm rotates from start to 70 degrees, the rotation speed of the stepper servo motor is adjusted to 1.2 to 1.5 times the rotation speed of the conveyor belt. When the toggle arm rotates from 70 degrees to 90 degrees, the rotation speed of the stepper servo motor is adjusted to 1.5 to 2.5 times the rotation speed of the conveyor belt. The 1.5 to 2.5 times adjustment generates an inertial thrust when the toggle arm stops rotating from 70 degrees to 90 degrees, which pushes the upright packaging bag over.

[0013] A further step in the solution is to install a starting position sensor for the actuating arm on the transmission frame on the side of the conveyor belt. The starting position sensor is used to correct the starting position of the actuating arm's 90-degree rotation so that the length direction of the actuating arm placed on the conveyor belt is always perpendicular to the direction of movement of the conveyor belt.

[0014] The solution further includes: the starting position correction of the 90-degree rotation of the toggle arm is initiated by a switch control when the packaging line starts working, and when it is deemed necessary by observation.

[0015] The beneficial effects of this invention are:

[0016] This invention features a simple inverting mechanism that can be directly installed at the end of the conveyor belt below the sealing machine, solving the connection problem. The inverting mechanism rotates the finished packaging bag 90 degrees at the end of the conveyor belt while simultaneously pushing the material bag flat onto the conveyor in a regular pattern. This inverting mechanism works by the front end of the curved surface (or arc surface) of the actuating arm first contacting the material, and then the rear end of the curved surface (or arc surface) of the actuating arm contacting the upright packaging bag, causing the upright packaging bag to rotate 90 degrees while simultaneously pushing it over using the inertia of the actuating arm's sudden stop. The inverting mechanism is simple to operate, highly effective, and has a simple structure and low cost.

[0017] The present invention will be further explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the side structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the planar structure of the present invention;

[0020] Figure 3 This is a schematic diagram showing the start-up time of the toggle arm in this invention;

[0021] Figure 4 This is a schematic diagram showing the upright packaging bag when the toggle arm of the present invention is rotated to a 70-degree angle.

[0022] Figure 5 This is a schematic diagram showing the upright packaging bag when the toggle arm of the present invention is rotated to a 90-degree angle. Detailed Implementation

[0023] Example 1:

[0024] A twisting and reversing device for sealed packaging bags, such as Figure 1 and Figure 2As shown, the twisting and reversing device includes a transmission frame 1 installed on the packaging line. A conveyor belt 2 is installed on the transmission frame 1. The conveyor belt is driven to rotate by a rotating roller 3, which is driven by a drive motor 101 installed on the transmission frame 1. The packaging bag sealing machine 4 on the packaging line is positioned above the center line of the width of the conveyor belt 2. The upright packaging bags 5 entering from the input end of the conveyor belt are sealed by the packaging bag sealing machine 4 along the center line of the width of the conveyor belt and then continue to be conveyed forward along the center line of the width of the conveyor belt. Along the moving direction of the conveyor belt 2, after passing the packaging bag... On the transmission frame 1 of the sealing machine, a rotating and tipping mechanism 6 is provided on one side of the conveyor belt 2. The rotating and tipping mechanism includes four actuating arms 601, which are horizontally and evenly distributed at a 90-degree angle and fixed to a rotating shaft 602. The actuating arms 601 are horizontally curved. A stepper servo motor 603 drives the rotating shaft 602 to rotate. The stepper servo motor 603 is supported and fixed by a motor support seat 604 provided on the transmission frame 1. A drive sprocket 605 is provided on the output shaft of the stepper servo motor 603. A driven sprocket is mounted on the drive shaft. A chain 606 is fitted onto both the drive sprocket 605 and the driven sprocket. The stepper servo motor 603 drives the rotating shaft 602 to rotate via the chain 606. A sensor detects the passing of an upright packaging bag 5, and the controller activates the stepper servo motor 603 to drive the rotating shaft 602. The stepper servo motor 603 has a grating sensor at its tail end. The controller controls the rotation of the actuating arm 601 via the grating sensor. Initially, one of the four actuating arms is positioned on the conveyor belt 2, and the other arm is positioned on the conveyor belt 2. The two adjacent actuating arms 601 of the upper actuating arm 601 are placed on the front and rear sides of the conveyor belt 2. The length direction of the actuating arm 601 placed on the conveyor belt is perpendicular to the moving direction of the conveyor belt 2. The arc-shaped curved outer convex surface 601-1 of the actuating arm faces the vertical packaging bag 5 moving on the conveyor belt 2. The rotating shaft 602 drives the four actuating arms to rotate and sweep across the conveyor belt 2 in sequence at a 90-degree angle according to the sensor signal. The vertical packaging bag 5 is clamped and rotated 90 degrees by the actuating arm placed on the conveyor belt and its adjacent actuating arm and then pushed over.

[0025] Specifically, in order to push over the upright packaging bag 5 after rotating 90 degrees, the linear velocity of the agitator arm 601 sweeping across the conveyor belt 2 is greater than the linear speed of the conveyor belt 2, thus enabling the upright packaging bag to be pushed over by the agitator arm after rotating 90 degrees. Furthermore, the linear velocity of the agitator arm sweeping across the conveyor belt is 1.2 to 2.5 times the linear speed of the conveyor belt.

[0026] The straight length of the actuating arm 601 is equal to the width of the conveyor belt 5. The outermost convex surface 601-1 of the arc-shaped bend of the actuating arm is located at the midpoint of the width of the conveyor belt 2. Furthermore, the bend ensures that when the actuating arm 601 stops rotating 90 degrees, the vertically positioned packaging bag 5 also rotates exactly 90 degrees. The rotation and inversion of the packaging bag 5 is directly determined by the above-mentioned structural features. Moreover, the arc-shaped bend of the actuating arm is such that the curvature of the front end 601-2 is greater than that of the rear end 601-3, meaning that the curvature of the rear end 601-3 tends to be flat. This bend structure ensures that when the actuating arm 601 suddenly stops rotating 90 degrees, the packaging bag 5 also rotates exactly 90 degrees. The process is as follows: as the actuating arm 601 rotates, the packaging bag will naturally twist along the rotation of the concave curved surface of the actuating arm. When the actuating arm 601 stops rotating, the packaging bag 5 will twist 90 degrees. As the actuating arm 601 and the conveyor belt have different linear speeds, when the actuating arm 601 suddenly stops rotating 90 degrees, it will push the packaging bag 5 over. The arc-shaped bending setting of the actuating arm 601 also changes with the different sizes of the packaging bag 4.

[0027] In this embodiment: the sensor is a position sensor 7 or a pressure sensor 8. The position sensor 7 is mounted on the transmission frame 1 to sense the arrival of the upright packaging bag 5. The pressure sensor 8 is mounted on the curved outer convex surface 601-1 of the actuating arm and sends a signal when the upright packaging bag 5 touches the curved outer convex surface of the actuating arm.

[0028] In this embodiment: the agitator arm must be at a certain height above the conveyor belt, neither too low nor too high, as both are unstable. Therefore, the height of the agitator arm above the conveyor belt is one-quarter to one-third the height of the vertical packaging bag.

[0029] Example 2:

[0030] A method for twisting and turning a packaged bag after sealing, based on the twisting and turning device described in Embodiment 1, is disclosed. The content of Embodiment 1 is considered the content of this embodiment. When sensor 7 or 8 senses the upright packaged bag 5, a stepper servo motor is activated. The controller controls the actuating arm 601 to rotate 90 degrees from the side of the conveyor belt and then stop. The stepper servo motor speed is adjusted from slow to fast starting from the starting point. The adjustment process is as follows: first, the starting speed of the stepper servo motor is determined according to the rotation speed of the conveyor belt; then, the speed of the stepper servo motor is adjusted according to the rotation angle of the actuating arm. The stepper servo motor stops rotating when the actuating arm rotates to 90 degrees. Furthermore, the speed adjustment generates a thrust when the actuating arm rotates to 90 degrees, which pushes the upright packaged bag over as the actuating arm rotates to 90 degrees.

[0031] Among them: such as Figure 3, 4 As shown in Figure 5, the speed adjustment is performed in stages. When the toggle arm rotates from start to 70 degrees, the rotation speed of the stepper servo motor is adjusted to 1.2 to 1.5 times the rotation speed of the conveyor belt. When the toggle arm rotates from 70 degrees to 90 degrees, the rotation speed of the stepper servo motor is adjusted to 1.5 to 2.5 times the rotation speed of the conveyor belt. The 1.5 to 2.5 times adjustment results in an inertial thrust that pushes the upright packaging bag over when the toggle arm stops rotating from 70 degrees to 90 degrees.

[0032] The method also includes the correction of the starting position of the agitator arm. For this purpose, a starting position sensor 9 of the agitator arm is provided on the transmission frame on the side of the conveyor belt. The starting position of the agitator arm is corrected by the starting position sensor so that the length direction of the agitator arm placed on the conveyor belt is always perpendicular to the moving direction of the conveyor belt.

[0033] Furthermore, calibration can be performed before each start-up, but this would increase the spacing between the vertical packaging bags 5 and reduce efficiency. Therefore, in order to improve efficiency, the starting position calibration of the 90-degree rotation of the toggle arm is initiated when the packaging line starts working, and is also initiated by switch control when it is deemed necessary by observation.

[0034] In Embodiments 1 and 2 of the above-mentioned twisting and overturning device and method for packaging bags, the front end of the curved surface (or arc surface) of the actuating arm rotates to contact the material first, and the rear end of the curved surface (or arc surface) of the actuating arm then contacts the upright packaging bag, causing the upright packaging bag to rotate 90 degrees while simultaneously pushing it over using the inertia of the actuating arm suddenly stopping. The overturning operation is simple, effective, and has a simple structure and low cost.

Claims

1. A twisting and reversing device for packaged bags after sealing, comprising a transmission frame disposed on a packaging line, a conveyor belt disposed on the transmission frame, a packaging bag sealing machine on the packaging line disposed on the conveyor belt, wherein upright packaging bags entering from the input end of the conveyor belt are sealed by the packaging bag sealing machine and then continue to be conveyed forward by the conveyor belt, characterized in that, Along the conveyor belt's movement direction, on the transmission frame after the packaging bag sealing machine, a rotating and tilting mechanism is installed on one side of the conveyor belt. This mechanism includes four actuating arms, evenly distributed horizontally at 90-degree angles and fixed to a rotating shaft. The actuating arms are horizontally curved. A stepper servo motor drives the rotating shaft to rotate. A sensor, sensing the passing of an upright packaging bag, triggers the stepper servo motor to drive the rotating shaft. The stepper servo motor has a light grating sensor at its tail end, and the controller controls the actuating arms via the light grating sensor. When the boom rotates, in the initial state, one of the four lever arms is placed on the conveyor belt, and the two adjacent lever arms are placed on the front and rear sides of the conveyor belt. The length direction of the lever arm placed on the conveyor belt is perpendicular to the moving direction of the conveyor belt. The curved outer convex surface of the lever arm faces the upright packaging bag moving on the conveyor belt. The rotating shaft drives the four lever arms to rotate and sweep across the conveyor belt in sequence at 90-degree angles according to the sensor signal. The upright packaging bag is clamped and rotated 90 degrees by the lever arm placed on the conveyor belt and its adjacent lever arm and then pushed over.

2. The twisting and turning device according to claim 1, characterized in that, The linear speed at which the agitator arm rotates and sweeps across the conveyor belt is greater than the linear speed of the conveyor belt, thus enabling the upright packaging bag to be pushed over by the agitator arm after rotating 90 degrees.

3. The twisting and turning device according to claim 2, characterized in that, The linear velocity of the rotating sweeping arm is 1.2 to 2.5 times the linear speed of the conveyor belt.

4. The twisting and turning device according to claim 1, characterized in that, The sensor is either a position sensor or a pressure sensor. The position sensor is mounted on the transmission frame to sense the arrival of the upright packaging bag. The pressure sensor is mounted on the curved outer convex surface of the actuating arm and sends a signal when the upright packaging bag touches the curved outer convex surface of the actuating arm.

5. The twisting and turning device according to claim 1, characterized in that, The height of the actuating arm above the conveyor belt is one-quarter to one-third the height of the vertically oriented packaging bag.

6. The twisting and turning device according to claim 1, characterized in that, The straight length of the agitator arm is equal to the width of the conveyor belt, and the bending arrangement ensures that when the agitator arm stops rotating 90 degrees, the upright packaging bag being agitated also rotates exactly 90 degrees.

7. A method for twisting and reversing a packaged bag after sealing, based on the device of claim 1, wherein when a sensor detects the upright packaging bag, a stepper servo motor is activated to control the toggle arm to rotate 90 degrees from the side of the conveyor belt as the starting point and then stop, characterized in that, Starting from the initial point, the speed of the stepper servo motor is adjusted from slow to fast. The adjustment process is as follows: first, the starting speed of the stepper servo motor is determined according to the rotation speed of the conveyor belt; then, the speed of the stepper servo motor is adjusted according to the rotation angle of the actuating arm. When the actuating arm rotates to 90 degrees, the stepper servo motor stops rotating. Furthermore, the speed adjustment causes the actuating arm to generate a thrust when it rotates to 90 degrees. This thrust pushes the upright packaging bag over as the actuating arm rotates to 90 degrees.

8. The method according to claim 7, characterized in that, The speed adjustment is done in stages. When the toggle arm rotates from start to 70 degrees, the rotation speed of the stepper servo motor is adjusted to 1.2 to 1.5 times the rotation speed of the conveyor belt. When the toggle arm rotates from 70 degrees to 90 degrees, the rotation speed of the stepper servo motor is adjusted to 1.5 to 2.5 times the rotation speed of the conveyor belt. The 1.5 to 2.5 times adjustment generates an inertial thrust when the toggle arm stops rotating from 70 degrees to 90 degrees, which pushes the upright packaging bag over.

9. The method according to claim 7, characterized in that, A starting position sensor for the actuating arm is installed on the transmission frame on the side of the conveyor belt. The starting position sensor is used to correct the starting position of the actuating arm's 90-degree rotation so that the length direction of the actuating arm placed on the conveyor belt is always perpendicular to the direction of movement of the conveyor belt.

10. The method according to claim 9, characterized in that, The starting position correction of the 90-degree rotation of the toggle arm is initiated by a switch when the packaging line starts working, and when it is deemed necessary by observation.

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