Methods to prevent box lids from springing back during paper box processing

Abstract

This invention belongs to the field of packaging box processing technology and discloses a method for preventing box lids from springing back during paper box processing. The paper box includes an upper lid and a lower lid, which are input when both lids are in a closed state, providing a conveying path for the paper box. An opening station, a check station, and a mold-taking station are sequentially set along the conveying path. At the opening station, the upper lid is opened to a first angle, and a first baffle is inserted into the box opening, with its end extending to the check station. At the check station, a pusher is provided on the front of the box opening to receive the upper lid, and then pushes it towards the upper lid to flip it to a second angle. Then, a check component extends downwards from above the box opening. At the mold-taking station, the upper lid is held at an angle greater than or equal to 90°. This invention eliminates the sliding linear flip-top solution of the existing technology and improves it to a segmented flip-top solution, resulting in a more stable anti-springing effect and a lower material loss rate.

Description

Technical Field

[0001] This invention belongs to the field of packaging processing technology, and specifically relates to a method for preventing box lids from springing back during paper box processing. Background Technology

[0002] Full-opening packaging boxes are increasingly used in cigarette packs, and the gradually maturing technology has made the processing quality and efficiency of full-opening packaging boxes more and more stable.

[0003] The existing method for manufacturing fully openable packaging boxes involves: first, preparing an outer box, i.e., a cardboard block where the outer paper completely covers the inner box; then, using a box-opening machine to cut three sides of the cardboard block and remove the inner mold. The inner mold is collected and reused, and the opened boxes undergo subsequent sorting and processing. In this method, the three-sided cutting process is now integrated into a single box-opening machine. A cutter is positioned along the outer box's travel path to cut the outer paper along the thickness edge, opening the cardboard block. An opening mechanism in the subsequent section of the path opens the lid, and a mold-removing mechanism in the next section removes the mold. A bent spiral baffle is typically used between the opening mechanism and the mold-removing mechanism to hold the lid in place and allow it to slide along the length of the baffle until the lid opens vertically.

[0004] As disclosed in patent document CN104441761A, the tail end of this spiral baffle is horizontal at the beginning to facilitate insertion into the box opening when the lid is opened, and vertical at the end to keep the lid vertical so that the mold-removing mechanism can directly remove the mold from inside the box; therefore, the baffle in the middle is spiral-shaped. This type of arc-shaped baffle has the following drawbacks:

[0005] (1) Thin sheet metal parts have poor safety and pose construction risks.

[0006] (2) The guiding efficiency of the spiral structure is limited: because the edge of the box lid is sharp and the pushing force of the box comes from the bottom cover of the box. If the top cover of the box is the first to be hit by the sharp corner, the sharp corner will be subjected to the reverse force when it hits the spiral part. If the force is too large, it will tear the cardboard box.

[0007] (3) When changing to another processing order, it is necessary to readjust the arc baffles of different lengths or spiral densities. Summary of the Invention

[0008] Based on the above background, the technical problem to be solved by the present invention is to provide a method for preventing the lid from springing back during paper box processing, which can effectively avoid the hidden dangers caused by the spiral baffle in the prior art.

[0009] This invention is implemented as follows:

[0010] A method for preventing the lid from springing back during paper box processing is disclosed. The paper box includes an upper lid and a lower lid. Both lids are input when they are in a closed state, providing a conveying path for the paper box. An opening station, a check station, and a mold-taking station are sequentially set along the conveying path. At the opening station, the upper lid is opened to a first angle and a first baffle is inserted into the box opening. The end of the baffle extends to the check station. At the check station, a pusher is provided on the front of the box opening to receive the upper lid, and then pushes the upper lid to flip it to a second angle. Then, a check component prevents the upper lid from flipping back and maintains the second angle. At the mold-taking station, the angle between the upper lid and the lower lid is made close to 90°.

[0011] Furthermore, the anti-return assembly includes a protruding member that extends downward from above the opening of the box so that the height of its bottom is lower than the height of the top of the cover, the bottom having a slope or arc surface.

[0012] Furthermore, the check valve assembly also includes a first mounting block, which has a guide groove, and the protruding component can slide up and down along the guide groove.

[0013] Furthermore, the protruding component includes a horizontal shaft and at least one guide shaft, the guide shaft being perpendicularly connected to the horizontal shaft and sliding in the guide groove, the horizontal shaft having the bottom.

[0014] Furthermore, the protruding component includes a first stop and at least one guide shaft, the guide shaft being perpendicularly connected to the upper end face of the stop and sliding in the guide groove, the stop having the bottom.

[0015] Furthermore, the check valve assembly also includes a second mounting block with a receiving groove; the protruding component includes a second stop and a hinge, one end of the second stop is hinged in the receiving groove, and the part near the other end abuts against the second mounting block by a spring.

[0016] Furthermore, the end of the baffle extends into the check valve station, where a pusher extends from the front of the box opening and from the upper part of the end of the baffle towards the top cover to flip it to the second angle.

[0017] Furthermore, the height of the end of the first baffle is higher than the height of its front end.

[0018] Furthermore, a second baffle is provided on the mold-taking station to keep the upper cover at an angle greater than or equal to 90°.

[0019] Compared with the prior art, the method for preventing box lid rebound in paper box processing provided by the present invention eliminates the sliding linear flip-top solution of the prior art and improves it into a segmented flip-top solution, which has the following significant improvements:

[0020] (1) At the check station, the box opening is directly flipped to the second angle, and the box opening is fully opened by the obstruction of the check component to facilitate further processing at the subsequent mold removal station.

[0021] (2) Avoid the force direction of the box body coinciding with the forward direction of the box body, so that the box body will not be tilted or slip during the transfer process.

[0022] (3) Material loss during the paper box flipping process is reduced. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the box opening process in an embodiment of the present invention;

[0024] Figure 2 This is a partial structural diagram of the edge-cutting and molding device in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram illustrating the working principle of the checkpoint in an embodiment of the present invention.

[0026] Figure 4 This is a first embodiment of the check valve component in this invention.

[0027] Figure 5 A second embodiment of the check valve component in this invention is shown in the diagram.

[0028] Figure 6 This is a third embodiment of the check valve component in this invention.

[0029] Figure 7 This is a fourth embodiment of the check valve component in this invention.

[0030] Figure 8 This is a fifth embodiment of the check valve component in this invention. Detailed Implementation

[0031] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] Example:

[0033] The present invention provides a schematic diagram of the opening process of an outer box. When the outer box is input into the cutting and molding device, the upper cover b and the lower cover a are wrapped together by the outer paper. Then, a blade is inserted in the conveying path. When the box has gone along the cutting path, the three sides of the box are cut open. At this time, the two covers have not been opened by external force and are in a closed state.

[0034] The present invention proposes to connect a conveying path downstream of the cutting path, and to set up an opening station 100, a check station 200 and a mold taking station 300 in sequence on the conveying path, where the cardboard box is stopped and processed.

[0035] At the opening station 100, the top cover is opened at a small angle, and then a baffle is inserted from the front of the box opening to block the top cover b and prevent it from springing back and closing. An inclined suction mechanism 11 is provided above the cover. This mechanism includes a flexible suction nozzle 12 to suck up the top cover and open it to a first angle α. On the opposite side of the opening, a baffle ejection mechanism 13 for the first baffle 14 is provided. The first baffle 14 extends laterally to allow the top cover b to slide.

[0036] The top cover b, relying on its own length, maintains a first angle α as it transitions to the check station 200. The check station 200 is equipped with a pusher mechanism 21, which includes a pusher 22. The pusher 22 supports the sliding of the top cover b and maintains the opening angle of the box. When the box stops in place, the pusher 22 pushes the top cover upwards, further opening the top cover b until it reaches the second angle β. This pusher mechanism 21 is located opposite the box opening, and a check component 23 is located above the box opening. When the edge b' of the top cover b passes the bottom projection of the check component, the bottom of the check component 23 descends to a position lower than the edge b', thus limiting and preventing the edge b' from rebounding. The second angle β can be maintained at approximately 85°-100°.

[0037] The upper cover b moves to the mold removal station 300 while maintaining the second angle β. A mold suction mechanism is set at the mold removal station 300. The suction mechanism extends downward from above the box opening to remove and collect the mold c from the lower cover a. The mold removal process is complete.

[0038] Between the opening station 100 and the check station 200, in order to maintain the stability of the first angle α, the rearward end of the first baffle 14 can be extended into the check station 200 to facilitate the pusher 22 receiving the upper cover b. In this case, the pusher 22 can be spliced ​​to the end of the first baffle 14, or it can be not flush with the first baffle 14.

[0039] The pusher 22 is positioned above the tail of the first baffle 14. When the cardboard box stops at the check position, it is pushed directly to the upper cover to impact the upper cover b and cause it to flip.

[0040] If the first baffle 14 does not extend to the check station 200, the first baffle 14 does not serve as a transition function, and the first baffle 14 can be quickly retracted and returned to its original position, resulting in a more compact processing cycle and higher processing efficiency for each station. If the first baffle 14 extends into the check station 200, the first baffle 14 will retract later, and the processing efficiency will be slightly slower.

[0041] It should be noted that the baffle and pusher in this invention are not limited to thin sheets, but can also be in block form. This is a modification that can be made by those skilled in the art based on their experience in production.

[0042] Similarly, the check valve component 23 set on the check valve station 200 can also extend into the mold removal station 300 to make the transition of the second angle β smoother, or a second baffle 31 can be set on the mold removal station and spliced ​​to the tail of the check valve component to keep the top cover greater than or equal to 90°.

[0043] The check valve assembly 23 can be either active or passive. An active check valve, such as a vertically suspended cylinder, extends a baffle downwards vertically based on a sensor's recognition signal. However, this type of check valve assembly is relatively expensive, significantly higher than the cost of existing spiral baffles. This invention also provides several passive check valve assemblies that utilize cardboard boxes and are less expensive.

[0044] The check valve assembly 23 includes a protruding part 230 and a mounting block that cooperates therewith. When the protruding part is at rest, its bottom is always lower than the height of the edge b' of the top cover.

[0045] One form of the mounting block is a first mounting block 231, which has a guide groove 233. The protruding part 230 includes a horizontal axis and a vertical guide shaft. The vertical guide shaft is slidably assembled in the guide groove 233. One end of the guide shaft is perpendicularly connected to the horizontal axis, and the other end is limited by the corresponding side of the first mounting block 231. Because the bottom of the horizontal axis is arc-shaped, when the pusher pushes the upper cover b to flip, the edge b' of the upper cover applies an upward force to the horizontal axis from the bottom of the horizontal axis. The guide shaft slides upward in the guide groove 233. Then the upper cover b continues to flip over the horizontal axis, and the entire protruding part slides downward under its own weight, blocking the front of the edge b' of the upper cover.

[0046] In this type of mounting block, the guide groove 233 can be set to multiple, as long as the other end of each guide shaft is fixed by a connecting rod so that each guide shaft moves synchronously.

[0047] In this type of mounting block, the protruding part 230 can also be replaced with a guide shaft and a stop 234. The bottom of the stop is set as an arc surface and / or a slope. When the edge b' of the top cover slides along the arc surface and / or slope, it can also push the guide shaft to move upward.

[0048] The second type of mounting block is the second mounting block 232. The second mounting block 232 is provided with a receiving groove 235, and the protruding part includes a second stop 236. One end of the second stop 236 is hinged to the receiving groove 235, and the other end is provided with a spring 237 between it and the second mounting block.

[0049] One end of the second stop 236 is still an arc surface and / or a slope. When the edge b' of the top cover moves along the arc surface and / or slope, the force-bearing part of the second stop bounces upward. When the edge b' of the top cover moves past the second stop, the force-bearing part bounces downward.

[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0051] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0052] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0053] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A method for preventing the lid of a cardboard box from springing back during cardboard box processing, the cardboard box comprising an upper lid and a lower lid, wherein the two lids are fed into the box when in a closed state, characterized in that: The system provides a conveyor path for the cardboard box, along which an opening station, a checkpoint, and a mold-removing station are sequentially set. - At the opening station, open the top cover to the first angle and insert the first baffle into the box opening, the end of which extends to the check valve station; - In the check valve station, a pusher is provided on the front of the box opening to receive the top cover, and then the top cover is pushed to flip it to the second angle. Then, a check valve component prevents the top cover from flipping back and maintains the second angle. - At the mold-taking station, the angle between the upper cover and the lower cover should be close to 90°.

2. The method for preventing box lid rebound during paper box processing according to claim 1, characterized in that: The anti-return assembly includes a protruding part that extends downward from above the opening of the box so that the height of its bottom is lower than the height of the top of the upper cover. - The bottom has a slope or a curved surface.

3. The method for preventing box lid rebound during paper box processing according to claim 2, characterized in that: The check valve assembly also includes a first mounting block, which has a guide groove, and the protruding component can slide up and down along the guide groove.

4. The method for preventing box lid rebound during paper box processing according to claim 3, characterized in that: The protruding component includes a horizontal shaft and at least one guide shaft, the guide shaft being perpendicularly connected to the horizontal shaft and sliding in the guide groove, the horizontal shaft having the bottom.

5. The method for preventing box lid rebound during paper box processing according to claim 3, characterized in that: The protruding component includes a first stop and at least one guide shaft, the guide shaft being perpendicularly connected to the upper end face of the stop and sliding in the guide groove, the stop having the bottom.

6. The method for preventing box lid rebound during paper box processing according to claim 2, characterized in that: The check valve assembly further includes a second mounting block having a receiving groove. - The protruding component includes a second stop and a hinge. One end of the second stop is hinged in the receiving groove, and the part near the other end abuts against the second mounting block by a spring.

7. The method for preventing box lid rebound during paper box processing according to claim 1, characterized in that: - The end of the baffle extends into the check valve station. - At the check valve station, a pusher extends from the front of the box opening and from the upper end of the baffle towards the top cover to flip it to the second angle.

8. The method for preventing box lid rebound during paper box processing according to claim 7, characterized in that: - The height of the end of the first baffle is higher than the height of its front end.

9. The method for preventing box lid rebound during paper box processing according to claim 1, characterized in that: - A second baffle is provided at the mold-taking station to keep the top cover at an angle greater than or equal to 90°.

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