Corrugated carton conveying anti-collision guide mechanism and method

Abstract

The invention discloses a corrugated carton conveying anti-collision guide mechanism and method, and relates to the field of carton conveying equipment. An inner guide frame and an outer guide frame are located on the inner periphery and the outer periphery of a steering area of a conveying belt correspondingly, a plurality of guide wheels are arranged on the sides, facing the conveying belt, of the inner guide frame and the outer guide frame, and a measurement and control module is arranged between every two adjacent guide wheels. The side, facing the conveying belt, of the measurement and control module is provided with a distance detection module and an air hole, and an air groove and a first electric control valve are arranged in the measurement and control module. A plurality of photoelectric probes and top side air taps are arranged above the steering area of the conveying belt, and the top side air taps are in one-to-one correspondence and are provided with second electric control valves. The method comprises the steps of start standby, friction force enhancement, real-time monitoring, normal guiding, anti-collision correction, friction force recovery, system resetting and the like. According to the corrugated carton conveying device, the collision risk of edges and corners of a carton can be reduced, excessive correction during conveying of the corrugated carton is avoided, the conveying stability and efficiency are improved, and the integrity of conveying of the corrugated carton is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of cardboard box conveying equipment, and more particularly to a corrugated cardboard box conveying anti-collision guiding mechanism and method. Background Technology

[0002] In industries such as logistics and product packaging, corrugated cardboard boxes have become one of the most widely used packaging carriers due to their advantages such as lightweight, high strength, and recyclability. Their transmission efficiency and integrity directly affect the operational efficiency of the entire production line. As a key node in cardboard box transmission, the conveyor belt turning area must simultaneously meet the requirements of accurate guidance and stable transmission, making it a core link to ensure a smooth transmission process.

[0003] Existing corrugated carton conveying and steering mechanisms generally employ a design approach of densely arranging guide wheels to achieve the guiding function. By increasing the contact points between the guide wheels and the sides of the carton, the offset range of the carton during the steering process is limited. However, this design has several prominent problems:

[0004] Firstly, the dense guide rollers significantly increase the probability of collision between the corners of corrugated cardboard boxes and the guide rollers. The corners of corrugated cardboard boxes are relatively weak, and repeated impacts can easily cause the corners to collapse and the corrugated structure to be damaged, seriously affecting the integrity of the packaging.

[0005] Secondly, existing steering mechanisms lack suitable position correction mechanisms: some mechanisms do not have active correction devices, so when the corners of corrugated boxes enter the gap between the guide wheels, they cannot effectively intervene and are prone to continuous collisions; other mechanisms use overcorrection, so even if the corrugated box does not collide with the guide wheels, it will be forcibly corrected to the center of the conveyor belt by the correction mechanism. However, in reality, the corrugated box does not need to be kept in the center of the conveyor belt during the transmission process. When the side of the corrugated box makes normal guiding contact with the guide wheels on both sides of the curve, there is no need for excessive intervention.

[0006] How to effectively solve the prominent technical problems that restrict the efficiency and integrity of corrugated cardboard box production and transportation has become a challenge. Summary of the Invention

[0007] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0008] This invention provides a corrugated cardboard box conveyor anti-collision guiding mechanism, including a conveyor belt, an inner guide frame distributed around the turning area of ​​the conveyor belt, and an outer guide frame distributed around the turning area of ​​the conveyor belt. Multiple guide wheels are arranged on the side of the inner and outer guide frames facing the conveyor belt. A measurement and control module is arranged between adjacent guide wheels of the inner guide frame and between adjacent guide wheels of the outer guide frame. A distance detection module and an air vent are arranged on the side of the measurement and control module facing the conveyor belt. An air groove communicating with the air vent is provided inside the measurement and control module, and a first electrically controlled valve communicating with the air groove is also provided in the measurement and control module. Above the turning area of ​​the conveyor belt, multiple vertically downward-probing photoelectric probes and multiple top-side air nozzles with vertically downward air outlets are also arranged. The positions of the top-side air nozzles are independently aligned with the photoelectric probes, and each top-side air nozzle is also equipped with a second electrically controlled valve.

[0009] The guiding mechanism includes an inner guide curve and an outer guide curve. The center of the outer guide curve coincides with the center of the inner guide frame's arc curve. Using the center of the inner guide frame's arc curve as a reference: the points on the inner guide frame farthest from the center of the arc curve are located on the inner guide curve. The points on the outer guide frame closest to the center of the arc curve are located on the outer guide curve. The distance between the distance detection module of the inner guide frame and the center of the arc curve is less than the radius of the inner guide curve. The distance between the distance detection module of the outer guide frame and the center of the arc curve is greater than the radius of the outer guide curve.

[0010] As a preferred technical solution of the guiding mechanism of the present invention: the number of air holes opened on the side of the measurement and control module facing the transmission belt is at least two, and they are symmetrically distributed on the upper and lower sides of the distance detection module.

[0011] As a preferred technical solution of the guiding mechanism of the present invention: the distance between the distance detection module of the inner guide frame and the center point of the arc curve, and the distance between the distance detection module of the outer guide frame and the center point of the arc curve are both d, and the radius of the guide wheel is r, then d>r. This size setting reduces the possibility of the corrugated cardboard box directly hitting the distance detection module. When the distance detection module detects that the corner of the corrugated cardboard box enters the gap between adjacent guide wheels, it can promptly push the corner of the corrugated cardboard box away from the distance detection module through airflow. In this invention, the method of closely arranging steering guide wheels is abandoned. Instead, a measurement and control module is used to monitor the gap between the guide wheels. When the corner of the corrugated cardboard box enters the gap between the guide wheels, the airflow promptly performs small-amplitude position correction on the corrugated cardboard box to avoid the corner of the corrugated cardboard box hitting the downstream guide wheel.

[0012] As a preferred technical solution of the guiding mechanism of the present invention: each measurement and control module and the top side air nozzle are independently connected to the air pipe, and the air pipe is equipped with an air source device.

[0013] As a preferred technical solution of the guiding mechanism of the present invention: let the width dimension of the measurement and control module be D1, and the gap dimension between adjacent guide wheels be D2, then D1 <D2。

[0014] As a preferred technical solution of the guiding mechanism of the present invention, the minimum distance between the guide wheels of the inner guide frame and the guide wheels of the outer guide frame is greater than the width of the corrugated cardboard box.

[0015] As a preferred technical solution of the guiding mechanism of the present invention, it further includes a positioning component for positioning and installing the measurement and control module. The positioning component includes a limiting spring that matches the gap size between adjacent guide wheels and an abutting protrusion that abuts against the measurement and control module. The positioning component also has a locking notch that matches the first electric control valve.

[0016] This invention provides a method for preventing collisions during the transport of corrugated cardboard boxes, comprising the following:

[0017] Step 1: The corrugated cardboard box is transported along the conveyor belt and gradually approaches the turning area. The system activates all photoelectric probes and distance detection modules to stand by.

[0018] Step 2: When the photoelectric probe detects that the corrugated carton has entered the turning area, it simultaneously triggers the opening of the second electrically controlled valve of the corresponding top air nozzle. The top air nozzle releases air vertically downwards, increasing the friction between the corrugated carton and the conveyor belt and ensuring transmission stability.

[0019] Step 3: The distance detection module monitors the distance between itself and the corrugated cardboard box in real time to determine whether the corrugated cardboard box is within the normal transmission range.

[0020] Step 4: If the corners of the corrugated cardboard box do not enter the gap between the guide wheels, keep the air nozzle on the top side continuously supplying air to maintain normal guiding status.

[0021] Step 5: If the corner of the corrugated cardboard box enters the gap between the guide wheels, the distance detection module triggers a signal to close the second electric control valves of all top-side air nozzles. At the same time, the first electric control valve of the corresponding gap control module opens, and gas is ejected from the air hole through the air groove, pushing the corner of the corrugated cardboard box out of the gap between the guide wheels.

[0022] Step Six: After the corrugated cardboard box is straightened and transported, the air nozzle on the top side of the corrugated cardboard box resumes airflow to maintain the transport friction of the corrugated cardboard box.

[0023] Step 7: The corrugated cardboard box gradually leaves the turning area. The downstream photoelectric probe detects the corrugated cardboard box leaving the turning area. After the system confirms that there are no other corrugated cardboard boxes in the turning area of ​​the conveyor belt, it closes all the first and second solenoid valves and the system resets to standby.

[0024] Compared with existing technologies, the beneficial effects of this invention are:

[0025] This invention abandons the traditional dense guide wheel design. Through real-time monitoring by a measurement and control module at the gap between the guide wheels, and combined with the installation dimensions of the measurement and control module relative to the guide wheels, the risk of cardboard box corners impacting the guide wheels and detection module is structurally reduced. Once a corrugated cardboard box corner is detected entering the gap, the air vents of the measurement and control module spray a balanced airflow to precisely push the corner away, achieving a small-amplitude correction. This avoids damage to the cardboard box corners, prevents secondary displacement caused by overcorrection, and reduces wear on the guide wheels due to their dense arrangement, extending the equipment's service life.

[0026] In this invention, when the carton enters the turning area, the corresponding top air nozzle precisely directs air downwards. This airflow pressure enhances the friction between the carton and the conveyor belt, effectively preventing slippage and deviation. When the carton's position needs to be corrected, the system immediately closes all top air nozzles to prevent airflow interference with the correction action, ensuring smooth correction. After correction, the corresponding top air nozzles are quickly restored to their original positions. This precise matching of the carton's transport status throughout the process ensures turning stability, avoids unnecessary airflow waste, and improves the transport efficiency of corrugated cartons. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the corrugated cardboard box conveying anti-collision guiding mechanism of the present invention.

[0028] Figure 2 for Figure 1 A magnified structural diagram of part A in the middle.

[0029] Figure 3 This is a schematic diagram of the positioning component in this invention.

[0030] Figure 4 for Figure 3 A schematic diagram of the structure of the positioning component M.

[0031] Figure 5 This is a schematic diagram of a corrugated cardboard box entering the turning area of ​​the conveyor belt in this invention.

[0032] Figure 6 for Figure 5 A magnified structural diagram of section B in the middle.

[0033] Figure 7 This is a schematic diagram of the measurement and control module in this invention.

[0034] The components are: 1-Conveyor belt; 2-Corrugated cardboard box; 3-Inner guide frame; 4-Outer guide frame; 5-Guide wheel; 501-Inner guide curve; 502-Outer guide curve; 6-Measurement and control module; 601-Distance detection module; 602-Air groove; 603-Air hole; 604-First electric control valve; 605-Air pipe; 7-Positioning component; 701-Limiting spring; 702-Positioning notch; 703-Abutting protrusion; 8-Top side air nozzle; 9-Second electric control valve; 10-Photoelectric probe. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0036] Example 1: This invention designs a corrugated cardboard box conveying anti-collision guiding mechanism, mainly composed of a conveyor belt 1, an inner guide frame 3, an outer guide frame 4, guide wheels 5, a measurement and control module 6, positioning components 7, a top-side air nozzle 8, a second electrically controlled valve 9, a photoelectric probe 10, an air pipe 605, and an air source device. These components work together to achieve stable conveying and anti-collision guidance of the corrugated cardboard box 2 in the turning area. The specific structural configuration is as follows:

[0037] Combination Figure 1 , Figure 3 , Figure 4 , Figure 7 The conveyor belt 1 serves as the foundation for carrying and transporting the corrugated cardboard box 2, providing the power support for the box to move along a set path. The conveyor belt 1, together with the inner guide frame 3 and the outer guide frame 4, forms a turning and transporting space. The inner guide frame 3 is located around the turning area of ​​the conveyor belt 1, and the outer guide frame 4 is located around the turning area. The inner guide frame 3 and the outer guide frame 4 are positioned opposite each other, jointly defining the turning and transporting range of the corrugated cardboard box 2. Multiple guide wheels 5 are installed on the side of the inner guide frame 3 and the outer guide frame 4 facing the conveyor belt 1. These guide wheels 5 can rotate freely, reducing friction between the side of the corrugated cardboard box 2 and the guide frame.

[0038] Combination Figure 1 , Figure 6 The mechanism of this invention includes an inner guide curve 501 and an outer guide curve 502. The center of the arc of the outer guide curve 502 coincides with the center of the arc of the inner guide frame 3. The guide wheels 5 of the inner guide frame 3 are located on the inner guide curve 501 at their furthest points from the center of the arc. The guide wheels 5 of the outer guide frame 4 are located on the outer guide curve 502 at their closest points to the center of the arc.

[0039] Combination Figure 1 , Figure 2 , Figure 6 , Figure 7The minimum distance between the guide wheels 5 of the inner guide frame 3 and the guide wheels 5 of the outer guide frame 4 is greater than the width of the corrugated cardboard box 2, ensuring that the corrugated cardboard box 2 can pass smoothly through the turning area. A measurement and control module 6 is configured between adjacent guide wheels 5 of the inner guide frame 3 and between adjacent guide wheels 5 of the outer guide frame 4, and the width D1 of the measurement and control module 6 is smaller than the gap D2 between adjacent guide wheels 5. A distance detection module 601 and air vents 603 are installed on the side of the measurement and control module 6 facing the conveyor belt 1. There are at least two air vents 603, symmetrically distributed above and below the distance detection module. The measurement and control module 6 has an air groove 602 communicating with the air vents 603, and also has a first electrically controlled valve 604 communicating with the air groove 602.

[0040] Combination Figure 1 , Figure 2 , Figure 6 , Figure 7 With the center of the arc-shaped curve of the inner guide frame 3 as the reference, the distance between the distance detection module 601 of the inner guide frame 3 and the center point of the arc-shaped curve is less than the radius R of the inner guide curve 501. The distance between the distance detection module 601 of the outer guide frame 4 and the center point of the arc-shaped curve is greater than the radius of the outer guide curve 502. The distances between the distance detection module 601 of the inner guide frame 3 and the center point of the arc-shaped curve, and the distances between the distance detection module 601 of the outer guide frame 4 and the center point of the arc-shaped curve are both d, and the radius of the guide wheel 5 is r, satisfying d>r, reducing the possibility of the corrugated cardboard box 2 directly impacting the distance detection module 601. Each measurement and control module 6 is independently connected to the air source equipment through the air pipe 605, and the first electric control valve 604 is used to control the opening and closing between the air tank 602 and the air pipe 605.

[0041] Combination Figure 1 , Figure 3 , Figure 4 , Figure 7 The positioning component 7 is used to position and install the measurement and control module 6, ensuring that the installation position of the measurement and control module 6 between adjacent guide wheels 5 is accurate. The positioning component 7 includes a limiting spring 701 that matches the gap size of the adjacent guide wheels 5, and an abutting protrusion 703 that abuts against the measurement and control module 6. The positioning component 7 also has a locking notch 702 that matches the first solenoid valve 604. When installing the measurement and control module 6, the positioning component 7 is snapped onto the measurement and control module 6, and the limiting spring 701 is inserted between the adjacent guide wheels 5 where the measurement and control module 6 is located. The outer side of the limiting spring 701 elastically abuts against the guide wheel 5, and then the installation position of the measurement and control module 6 is fixed and locked. After the measurement and control module 6 is installed, the positioning component 7 can be removed.

[0042] Combination Figure 1 , Figure 5Above the turning area of ​​conveyor belt 1, there are multiple vertically downward-probing photoelectric probes 10 and multiple vertically downward-directing top-side air nozzles 8. The positions of the top-side air nozzles 8 are independently aligned with the photoelectric probes 10. Each top-side air nozzle 8 is equipped with a second electrically controlled valve 9. Each top-side air nozzle 8 is independently connected to an air source device through an air pipe. The second electrically controlled valve 9 is used to control the air output and closing of the top-side air nozzle 8.

[0043] Example 2: This invention designs a method for preventing collisions during the transport of corrugated cardboard boxes. The specific method is as follows:

[0044] (a) Initial stage of transmission

[0045] The corrugated cardboard box 2 is transported along the conveyor belt 1. When it reaches the turning area of ​​the conveyor belt 1, the photoelectric probe 10 detects the position signal of the corrugated cardboard box 2, and the distance detection module 601 detects the distance between itself and the corrugated cardboard box 2 in real time.

[0046] (ii) Normal guidance state

[0047] When the photoelectric probe 10 detects a signal indicating that the corrugated cardboard box 2 is obstructed, the second electrically controlled valve 9 corresponding to the top air nozzle 8 at the alignment position opens, and the top air nozzle 8 releases air downwards. The airflow applies pressure to the corrugated cardboard box 2, increasing the friction between the corrugated cardboard box 2 and the conveyor belt 1, thus ensuring the stable transmission of the corrugated cardboard box 2.

[0048] When the corner of the corrugated cardboard box 2 does not enter the gap between two adjacent guide wheels 5, that is, when the distance detection module 601 detects that the distance between itself and the corrugated cardboard box 2 is greater than the minimum reference distance preset by the system (for the distance detection module 601 on the inner guide frame 3, its minimum reference distance is the distance between the distance detection module 601 on the inner guide frame 3 and the inner guide curve 501; for the distance detection module 601 on the outer guide frame 4, its minimum reference distance is the distance between the distance detection module 601 on the outer guide frame 4 and the outer guide curve 502), the top side air nozzle 8 will release air normally.

[0049] (III) Collision Avoidance Correction Status

[0050] When the corner of the corrugated cardboard box 2 enters the gap between two adjacent guide rollers 5, that is, when the distance detection module 601 detects that the distance between the corrugated cardboard box 2 and the corrugated cardboard box 2 is not greater than the minimum reference distance preset by the system, the second electronically controlled valves 9 corresponding to all the top side air nozzles 8 are closed, and the top side air nozzles 8 stop emitting air.

[0051] At the same time, the first electrically controlled valve 604 corresponding to the distance detection module 601 that detects the corner of the corrugated cardboard box 2 entering the gap opens, and the gas supplied by the gas source equipment is ejected from the air hole 603 through the air pipe 605 and the air groove 602, blowing the corner of the corrugated cardboard box 2 that has entered the gap between the adjacent guide wheels 5 out of the gap area.

[0052] After the correction is completed, the second electrically controlled valve 9 corresponding to the top side air nozzle 8 directly above the corrugated cardboard box 2 is reopened, and the top side air nozzle 8 continues to blow air toward the corrugated cardboard box 2 to maintain the friction between the corrugated cardboard box 2 and the conveyor belt 1.

[0053] (iv) Transition Completion Stage

[0054] When the corrugated cardboard box 2 leaves the turning area of ​​the conveyor belt 1, that is, when the downstream photoelectric probe 10 detects that the obstruction signal of the corrugated cardboard box 2 changes from the obstruction state to the unobstructed state, and there are no other corrugated cardboard boxes 2 in the turning area of ​​the conveyor belt 1, at this time the first electric control valve 604 of all measurement and control modules 6 closes, and the second electric control valve 9 of all top side air nozzles 8 closes, waiting for the next corrugated cardboard box 2 to enter the turning area.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A corrugated cardboard box conveying anti-collision guiding mechanism, comprising a conveyor belt (1), an inner guide frame (3) distributed around the turning area of ​​the conveyor belt (1), and an outer guide frame (4) distributed around the turning area of ​​the conveyor belt (1), wherein the inner guide frame (3) and the outer guide frame (4) are each provided with a plurality of guide wheels (5) on the side facing the conveyor belt (1), characterized in that: Measurement and control modules (6) are configured between adjacent guide wheels (5) of the inner guide frame (3) and between adjacent guide wheels (5) of the outer guide frame (4). The measurement and control modules (6) are configured with a distance detection module (601) and an air hole (603) on the side facing the conveyor belt (1). The measurement and control modules (6) are provided with an air groove (602) communicating with the air hole (603) inside. The measurement and control modules (6) are also configured with a first electric control valve (604) communicating with the air groove (602). Above the turning area of ​​the conveyor belt (1), there are also multiple vertically downward photoelectric probes (10) and multiple vertically downward air outlets (8). The positions of the top air outlets (8) are independently aligned with the photoelectric probes (10), and each top air outlet (8) is also equipped with a second electric control valve (9). The guiding mechanism also includes an inner guide curve (501) and an outer guide curve (502). The center of the arc curve of the outer guide curve (502) coincides with the center of the arc curve of the inner guide frame (3), with the center of the arc curve of the inner guide frame (3) as the reference. The guide wheels (5) of the inner guide frame (3) are located on the inner guide curve (501) at their farthest points from the center point of the arc curve. The guide wheels (5) of the outer guide frame (4) are located on the outer guide curve (502) at their closest points to the center point of the arc curve. The distance between the distance detection module (601) of the inner guide frame (3) and the center point of the arc curve is less than the radius of the inner guide curve (501). The distance between the distance detection module (601) of the outer guide frame (4) and the center point of the arc curve is greater than the radius of the outer guide curve (502).

2. The anti-collision guiding mechanism for corrugated cardboard box conveying according to claim 1, characterized in that: The measurement and control module (6) has at least two air holes (603) on the side facing the transmission belt (1), and they are symmetrically distributed on the upper and lower sides of the distance detection module (601).

3. The anti-collision guiding mechanism for corrugated cardboard box conveying according to claim 1, characterized in that: Let the distance between the distance detection module (601) of the inner guide frame (3) and the center point of the arc curve, and the distance between the distance detection module (601) of the outer guide frame (4) and the center point of the arc curve be d, and the radius of the guide wheel (5) be r, then d>r.

4. The anti-collision guiding mechanism for corrugated cardboard box conveying according to claim 1, characterized in that: Each measurement and control module (6) and top side air nozzle (8) are independently connected to the air pipe (605), and the gas pipeline is equipped with an air source device.

5. The anti-collision guiding mechanism for corrugated cardboard box conveying according to claim 1, characterized in that: Let the width of the measurement and control module (6) be D1, and the gap between adjacent guide wheels (5) be D2, then D1 <D2。 6. The anti-collision guiding mechanism for corrugated cardboard box conveying according to claim 1, characterized in that: The minimum distance between the guide wheels (5) of the inner guide frame (3) and the guide wheels (5) of the outer guide frame (4) is greater than the width of the corrugated cardboard box (2).

7. The anti-collision guiding mechanism for corrugated cardboard box conveying according to claim 1, characterized in that: It also includes a positioning component (7) for positioning and installing the measurement and control module (6). The positioning component (7) includes a limiting spring (701) that matches the gap size of the adjacent guide wheel (5) and an abutting protrusion (703) that abuts against the measurement and control module (6). The positioning component (7) also has a locking notch (702) that matches the first electric control valve (604).

8. A method for preventing collisions and guiding corrugated cardboard boxes during transport, characterized in that, A corrugated cardboard box conveying anti-collision guiding mechanism applied to any one of claims 1 to 7, comprising the following: Step 1: The corrugated cardboard box (2) is transported along the conveyor belt (1) and gradually approaches the turning area. The system starts each photoelectric probe (10) and distance detection module (601) to stand by. Step 2: When the photoelectric probe (10) detects that the corrugated carton (2) has entered the turning area, it simultaneously triggers the second electronically controlled valve (9) of the corresponding top air nozzle (8) to open, and the top air nozzle (8) releases air vertically downward to enhance the friction between the corrugated carton (2) and the conveyor belt (1) and ensure the stability of the transmission. Step 3: The distance detection module (601) monitors the distance between itself and the corrugated cardboard box (2) in real time to determine whether the corrugated cardboard box (2) is within the normal transmission range; Step 4: If the corner of the corrugated cardboard box (2) does not enter the gap of the guide wheel (5), keep the top air nozzle (8) continuously venting air to maintain normal guiding status; Step 5: If the corner of the corrugated cardboard box (2) enters the gap of the guide wheel (5), the distance detection module (601) triggers a signal to close the second electric control valve (9) of all the top side air nozzles (8), and at the same time, the first electric control valve (604) of the corresponding gap control module (6) opens, and the gas is ejected from the air hole (603) through the air groove (602), pushing the corner of the corrugated cardboard box (2) out of the gap of the guide wheel (5); Step 6: After the corrugated cardboard box (2) is straightened, the top air nozzle (8) on the top side of the corrugated cardboard box (2) resumes air output to maintain the transmission friction of the corrugated cardboard box (2); Step 7: The corrugated cardboard box (2) gradually leaves the turning area. The downstream photoelectric probe (10) detects the signal that the corrugated cardboard box (2) has left the turning area. After the system confirms that there are no other corrugated cardboard boxes (2) in the turning area of ​​the conveyor belt (1), it closes all the first electric control valves (604) and the second electric control valves (9) and the system is reset and ready to go.

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