An automatic opening and bottom folding method and device for a paper box or carton

Abstract

The present invention discloses a method for automatically opening and bottom folding a paper box or a paper carton. The paper box or the paper carton in the original state is pushed into the working station by a feeding mechanism, the front tongue pressing mechanism presses the front tongue of the paper box or the paper carton, the side plates of the paper box or the paper carton are pushed by a side plate folding mechanism to open the paper box or the paper carton, the tensioning mechanism extends into the paper box or the paper carton to completely open and position the paper box or the paper carton, the bottom folding device first folds the lower tongue, then folds the left tongue and the right tongue, and finally folds the upper tongue and inserts the tip of the upper tongue into the inner side of the lower tongue, so as to complete the automatic bottom folding of the paper box or the paper carton. The present invention also discloses an apparatus for automatically opening and bottom folding a paper box or a paper carton. The present invention realizes the mechanization, automation and unmanned operation of the folding of the paper box or the paper carton, greatly improves the production efficiency, saves labor, and the bottom of the paper box or the paper carton is buckled together by its own upper tongue, lower tongue, left tongue and right tongue, without using glue for pasting additionally.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging, and in particular to an automatic opening and bottom folding method for a paper box or a cardboard box, and also relates to an apparatus for automatically opening and bottom folding a paper box or a cardboard box. Background Art

[0002] Paper boxes and cardboard boxes are widely used in product packaging, such as the packaging of items like medicines, cosmetics, batteries, etc. For the convenience of transportation, common paper boxes and cardboard boxes are in a folded state after being produced by a packaging printing factory. As shown in a paper box in Figure 1 Before loading the product into the box, the paper box needs to be opened and the bottom sealed first. The traditional method for folding the bottom of a paper box / cardboard box is that after the paper box / cardboard box is opened, the left tongue 11 and the right tongue 14 of the paper box / cardboard box are first folded, then glue is applied, and then the upper tongue 12 and the lower tongue 13 are folded, and the upper tongue 12 and the lower tongue 13 are adhered to the left tongue 11 and the right tongue 14 with glue to complete the bottom sealing, or the upper tongue 12 and the lower tongue 13 are folded, and the upper tongue 12 and the lower tongue 13 are adhered to the box body with a tape. In the process of sealing the bottom of the paper box, using glue and tape requires integrating glue application and taping mechanisms in the equipment, the equipment structure is relatively complex, and it is not environmentally friendly enough.

[0003] In fact, the upper tongue 12, the lower tongue 13, the left tongue 11 and the right tongue 14 of the paper box itself have a certain strength, and the bottom can be sealed by making them cross and buckle together through bottom folding. However, currently, only manual bottom folding can be performed, and the manual folding efficiency is low and the labor cost is high. Summary of the Invention

[0004] The object of the present invention is to provide an automatic opening and bottom folding method for a paper box or a cardboard box. First, fix the front tongue of the paper box or cardboard box, then push the left side plate to open the paper box or cardboard box, and make the paper box or cardboard box fully open and positioned and fixed through a tensioning mechanism. Finally, make the upper tongue, the lower tongue, the left tongue and the right tongue cross and buckle through a bottom folding device to complete the bottom sealing of the paper box / cardboard box, realizing mechanical automatic bottom folding without glue, improving production efficiency and reducing labor. The present invention also relates to an apparatus for automatically opening and bottom folding a paper box or a cardboard box for implementing this method.

[0005] To achieve the above object, the present invention adopts the following technical solution: An automatic opening and bottom folding method for a paper box or cardboard box, in which a paper box or cardboard box in an original state is pushed into a working station by a pushing mechanism. Each time the pushing mechanism pushes out a paper box or cardboard box in the original state at the bottom of the storage tank. The front tongue pressing mechanism presses the front tongue of the paper box or cardboard box, and the side plate folding mechanism pushes the side plates of the paper box or cardboard box to open the paper box or cardboard box. The tensioning mechanism extends into the paper box or cardboard box to completely open and position the paper box or cardboard box. The bottom folding device first folds the lower tongue, then folds the left tongue and the right tongue, and finally folds the upper tongue and inserts the tip of the upper tongue into the inner side of the lower tongue, thereby completing the automatic bottom folding of the paper box or cardboard box.

[0006] More specifically, first fold the lower tongue in place, then fold the left tongue and the right tongue in place. The lower halves of the left tongue and the right tongue block both sides of the lower tongue. After that, fold the upper tongue. The two sides of the upper tongue block the upper halves of the left tongue and the right tongue. Finally, push the tip of the upper tongue inward. The tip of the upper tongue is inserted into the box and blocked by the lower tongue, so that the lower tongue, the left tongue, the right tongue, and the upper tongue are buckled together to complete the folding.

[0007] Further preferably, the tensioning mechanism positions the creases of the lower tongue, the left tongue, and the right tongue. The tensioning mechanism is provided with a left tongue pressing and tightening member and a right tongue pressing and tightening member that can contract or expand. After the left tongue pressing and tightening member and the right tongue pressing and tightening member extend into the paper box or cardboard box, they expand, and the front ends are pressed against the crease position of the upper tongue to achieve the positioning of the upper tongue crease.

[0008] Further preferably, a lifting cylinder is installed to adjust the height of the tensioning mechanism to adapt to products of different specifications.

[0009] Further preferably, after the bottom folding is completed, the tensioning mechanism contracts and withdraws. The semi-finished product ejecting cylinder ejects the paper box or cardboard box with the bottom folded out of the working station, and then the opening and bottom folding processing of the next paper box or cardboard box is carried out.

[0010] Corresponding to the above method, the present invention provides an automatic opening and bottom folding device for a paper box or cardboard box, including a pushing mechanism, an opening device, and a bottom folding device. The pushing mechanism pushes the paper box or cardboard box into the working station. The opening device is used to fix and open the paper box or cardboard box. The bottom folding device folds the box tongues at the bottom of the paper box or cardboard box. The bottom folding device includes a lower tongue pressing mechanism for folding the lower tongue, a left tongue pressing mechanism for folding the left tongue, a right tongue pressing mechanism for folding the right tongue, and an upper tongue pressing mechanism for folding the upper tongue. The upper tongue pressing mechanism is composed of a vertical movement mechanism parallel to the box bottom and a horizontal movement mechanism that can push the upper tongue into the paper box.

[0011] Further preferably, the vertical movement mechanism is composed of a vertical cylinder and a pressing tongue cylinder fixing plate. The vertical cylinder is installed on the folding device bracket, and the push rod of the vertical cylinder is connected to the pressing tongue cylinder fixing plate. The horizontal movement mechanism is composed of a horizontal cylinder and a pressing tongue member. The horizontal cylinder is fixed together with the pressing tongue cylinder fixing plate, and the push rod of the horizontal cylinder is connected to the pressing tongue member. The vertical cylinder pushes the assembly formed by the pressing tongue cylinder fixing plate, the horizontal cylinder, and the pressing tongue member to move downward to bend the upper tongue by 90 degrees. Then, the horizontal cylinder pushes the pressing tongue member into the box to insert the tip of the upper tongue into the inner side of the lower tongue.

[0012] Further preferably, the opening device is composed of a front tongue pressing mechanism for pressing the front tongue of a paper box or cardboard box, a side plate folding mechanism for erecting the left side plate, and a tensioning mechanism that extends into the opened paper box or cardboard box to fully open and position the paper box or cardboard box.

[0013] Further preferably, the tensioning mechanism includes a tensioning mechanism base, a tensioning cylinder, a left pressing tongue tightening member driving mechanism, a left pressing tongue tightening member, a left pressing front tongue member, a right pressing tongue tightening member, a right pressing front tongue member, and a right pressing tongue tightening member driving mechanism. The tensioning cylinder is connected to the tensioning mechanism base. The left pressing front tongue member and the right pressing front tongue member are respectively installed at the left and right ends of the tensioning mechanism base. A rotatable left pressing tongue tightening member is installed at the upper end of the left pressing front tongue member, and the left pressing tongue tightening member is connected to the left pressing tongue tightening member driving mechanism. A rotatable right pressing tongue tightening member is installed at the upper end of the right pressing front tongue member, and the right pressing tongue tightening member is connected to the right pressing tongue tightening member driving mechanism.

[0014] Further preferably, the tensioning mechanism further includes an ejecting cylinder for ejecting the semi-finished product of the paper box or cardboard box after bottom folding, and the semi-finished product ejecting cylinder is fixed inside the left pressing front tongue member or the right pressing front tongue member.

[0015] Further preferably, the tensioning mechanism further includes a lifting cylinder for driving the entire tensioning mechanism to lift and lower, and the push rod of the lifting cylinder is connected to the tensioning cylinder through a mounting plate.

[0016] Further preferably, the lower tongue pressing mechanism is composed of a lower tongue pressing cylinder, a lower tongue folding pressing plate, a hinge, and a cylinder connecting plate. One hinge leaf of the hinge is installed on the bottom plate of the folding station, and the other hinge leaf of the hinge is fixedly connected to the lower tongue folding pressing plate. The lower tongue folding pressing plate is connected to the push rod of the lower tongue pressing cylinder through the cylinder connecting plate. The lower tongue folding pressing plate is driven by the lower tongue pressing cylinder to rotate around the hinge to automatically fold the lower tongue.

[0017] Further preferably, the right tongue pressing mechanism is composed of a right pressing arm, a right pressing wheel fixing arm, a right pressing wheel and a right tongue pressing cylinder. The right tongue pressing cylinder is connected to the right pressing arm. The front end of the right pressing arm is connected to one end of the right pressing wheel fixing arm through a connecting rod. The other end of the right pressing wheel fixing arm is provided with the right pressing wheel. The left tongue pressing mechanism is composed of a left pressing arm, a left pressing wheel fixing arm, a left pressing wheel and a left tongue pressing cylinder. The left tongue pressing cylinder is connected to the left pressing arm. The front end of the left pressing arm is connected to one end of the left pressing wheel fixing arm through a connecting rod. The other end of the left pressing wheel fixing arm is provided with the left pressing wheel. The right tongue pressing cylinder and the left tongue pressing cylinder are fixed through a folding device bracket. The right tongue pressing cylinder and the left tongue pressing cylinder respectively drive the right pressing arm and the left pressing arm to reciprocate left and right, driving the right pressing wheel and the left pressing wheel to automatically fold the left tongue and the right tongue respectively.

[0018] Further preferably, the pushing mechanism is installed below the storage tank. The storage tank is formed by connecting four aluminum profiles into one body to form a bracket that can position the four outer sides of the original state paper box or cardboard box, and is installed on the workbench. Each time the pushing mechanism pushes out an original state paper box or cardboard box at the bottom of the storage tank.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention automatically transports, fixes, opens, and positions a paper box or cardboard box, and then automatically folds the lower tongue, left tongue, right tongue, and upper tongue in sequence, and can insert the upper tongue into the box to complete automatic folding. The two sides of the lower tongue cross the lower half of the left tongue and the right tongue, the two sides of the upper tongue cross the upper half of the left tongue and the right tongue, and the tip of the upper tongue crosses the lower tongue, so that the four parts of the lower tongue, left tongue, right tongue, and upper tongue are buckled together without using glue for pasting. It is mechanized and automated, without manual folding, saving manpower and improving the folding efficiency.

[0021] The device of the present invention presses the front tongue of a paper box or carton through a front tongue pressing mechanism, and then opens the paper box or carton through a folding side panel mechanism. The tensioning mechanism is used to completely open and fix the paper box or carton after opening the box, which is convenient for the subsequent bottom folding action. It not only plays the role of opening the paper box, but also plays the role of positioning the folding lines of the upper tongue, lower tongue, left tongue and right tongue on the left and right sides, and can support the lower tongue, left tongue and right tongue during the folding process of the upper tongue, so that the upper tongue can pass through the lower tongue and be inserted into the box during the folding process. The left tongue pressing mechanism for folding the left tongue and the right tongue pressing mechanism for folding the right tongue move synchronously, and the left tongue and the right tongue are pressed synchronously by the left pressing wheel and the right pressing wheel. The upper tongue is folded by driving the upper tongue pressing member downward by the vertical cylinder, and then the upper tongue pressing member is pushed by the horizontal cylinder to move into the carton, so that the front leaf of the upper tongue passes through the lower tongue and pushes into the carton. The upper tongue pressing mechanism is reset to complete the folding action of the bottom of the carton. The upper tongue pressing mechanism can not only fold the upper tongue by 90 degrees, but also make the front end of the upper tongue cross the folded lower tongue and push into the box, so that the upper tongue, lower tongue, left tongue and right tongue are fixed by the cross-engaging action. If there is no tensioning mechanism, during the process of folding the upper tongue into the box, the lower tongue, left tongue and right tongue will fold into the box due to the pressure of the upper tongue, and it cannot be ensured that the upper tongue is inserted into the inner side of the lower tongue. For this reason, the present invention designs a tensioning mechanism and an upper tongue pressing mechanism to ensure that the tip of the upper tongue can be automatically inserted into the inner side of the lower tongue.

[0022] The tensioning mechanism of the present invention can be automatically contracted or opened, and can be adjusted to adapt to different product specifications. The device of the present invention can be used to fold cartons or paper boxes of various specifications, and of course can also be used for other similar packaging boxes. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the original state of the paper box.

[0024] Figure 2 It is a three-dimensional schematic diagram after the bottom of the paper box is folded.

[0025] Figure 3 This is a schematic diagram of the bottom of the carton after the bottom is folded.

[0026] Figure 4 It is a schematic diagram of the equipment for automatically opening and bottom folding of the paper box or carton according to the present invention.

[0027] Figure 5 Schematic diagram of the equipment for automatically opening and bottom folding of a carton or paper box according to the present invention (without a workbench).

[0028] Figure 6 Schematic diagram of equipment for automatic opening and bottom folding of cartons or cartons with the hopper removed.

[0029] Figure 7 It is a schematic diagram of the storage tank.

[0030] Figure 8It is a schematic diagram of the folding side plate mechanism.

[0031] Figure 9 It is a schematic diagram of the tensioning mechanism.

[0032] Figure 10 It is a connection schematic diagram of the left tongue pressing and tightening part driving mechanism and the left tongue pressing and tightening part.

[0033] Figure 11 It is a front view schematic diagram of the bottom folding device.

[0034] Figure 12 It is a rear view schematic diagram of the bottom folding device.

[0035] Figure 13 It is a schematic diagram of the lower tongue pressing mechanism.

[0036] Figure 14 It is a schematic diagram of the right tongue pressing mechanism.

[0037] Figure 15 It is a schematic diagram of the left tongue pressing mechanism.

[0038] Figure 16 It is a schematic diagram of the upper tongue pressing mechanism.

[0039] In the figure: 1. Carton, 11. Left tongue, 12. Upper tongue, 13. Lower tongue, 14. Right tongue, 15. Left side plate, 16. Right side plate, 17. Front tongue, 2. Pushing material mechanism, 3. Storage tank, 4. Tensioning mechanism, 41. Lifting cylinder, 42. Tensioning cylinder, 43. Tensioning mechanism base, 44. Left tongue pressing and tightening part driving mechanism, 441. Cylinder connecting piece, 45. Left tongue pressing and tightening part, 451. Tightening arm, 452. Rotating arm, 453. Connecting arm, 46. Left front tongue pressing piece, 461. Positioning plate, 47. Right tongue pressing and tightening part, 48. Right front tongue pressing piece, 49. Right tongue pressing and tightening part driving mechanism, 50. Semi-finished product ejecting cylinder, 5. Bottom folding device, 51. Folding device bracket, 52. Right tongue pressing mechanism, 521. Right pressing arm, 522. Right pressing wheel fixing arm, 523. Right pressing wheel, 53. Upper tongue pressing mechanism, 531. Vertical cylinder, 532. Upper tongue pressing cylinder fixing plate, 533. Horizontal cylinder, 534. Upper tongue pressing piece, 54. Left tongue pressing mechanism, 55. Lower tongue pressing mechanism, 551. Lower tongue folding pressing plate, 552. Hinge, 553. Lower tongue pressing cylinder, 554. Cylinder connecting plate, 6. Folding side plate mechanism, 61. Box opening plate, 62. Folding side plate cylinder, 7. Front tongue pressing mechanism. Specific implementation method

[0040] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0041] In order to Figure 1 open the shown paper box and fold it into Figures 2-3 the shown shape, the present invention provides a method for automatically opening and bottom folding a paper box or cardboard box. The paper box or cardboard box in the original state is pushed into the working station, the front tongue of the paper box or cardboard box is pressed tightly, the side plates of the paper box or cardboard box are pushed to open the paper box or cardboard box, and the tensioning mechanism extends into the paper box or cardboard box to completely open and position the paper box or cardboard box. First, the lower tongue 13 is folded in place, then the left tongue 11 and the right tongue 14 are folded in place. The lower halves of the left tongue 11 and the right tongue 14 block both sides of the lower tongue 13. After that, the upper tongue 12 is folded, and both sides of the upper tongue 12 block the upper halves of the left tongue 11 and the right tongue 14. Finally, the tip 121 of the upper tongue is pushed inward, and the tip 121 of the upper tongue is inserted into the box and blocked by the lower tongue 13, so that the lower tongue 13, the left tongue 11, the right tongue 14, and the upper tongue 12 are buckled together to complete the folding.

[0042] To implement the above automatic folding method, the present invention provides a device for automatically opening and bottom folding a paper box or cardboard box, as Figures 4-6 shown. It includes a storage tank 3, a feeding mechanism 2, an opening device for fixing and opening the paper box or cardboard box, and a bottom folding device 5 for folding the bottom box tongues of the paper box or cardboard box. The feeding mechanism 2 is installed on the left side of the storage tank 3. The feeding mechanism 2 is composed of a feeding cylinder 21 and a feeding plate 22. The push rod of the feeding cylinder 21 is connected to the feeding plate 22, and the feeding plate 22 pushes the paper box in the original state falling from the storage tank 3. The storage tank 3 is as Figure 7 shown. The storage tank is formed by connecting four aluminum profiles into one body to form a bracket that can position the four outer sides of the paper box or cardboard box in the original state. It is installed on the workbench plate for storing the paper box or cardboard box in the original state and positioning the four outer sides of the paper box or cardboard box in the original state to prevent the paper box or cardboard box in the original state from being placed obliquely.

[0043] Referring to Figures 8-11 , the opening device includes a side plate folding mechanism 6 for erecting the left side plate, a front tongue pressing mechanism 7 for pressing the front tongue of the paper box or cardboard box, and a tensioning mechanism 4 that extends into the opened paper box 1 or cardboard box to completely open the paper box or cardboard box. The front tongue pressing mechanism 7 is arranged directly above the front tongue 17 of the paper box entering the box opening station and is composed of a front tongue pressing cylinder and a front tongue pressing rod driven by the front tongue pressing cylinder. The side plate folding mechanism 6 is arranged below the left side plate 15 after the original paper box is pushed into the box opening station, as Figure 7As shown, the folding side plate mechanism 6 is composed of an opening box plate 61 and a folding side plate cylinder 62. The opening box plate 61 is connected to the push rod of the folding side plate cylinder 62 through a connecting plate.

[0044] As Figure 9 shown, the tensioning mechanism 4 includes a lifting cylinder 41, a tensioning cylinder 42, a tensioning mechanism base 43, a left tongue pressing and tightening member driving mechanism 44, a left tongue pressing and tightening member 45, a left front tongue pressing member 46, a right tongue pressing and tightening member 47, a right front tongue pressing member 48, and a right tongue pressing and tightening member driving mechanism 49. The push rod of the lifting cylinder 41 is connected to the tensioning cylinder 42 through a mounting plate. The tensioning cylinder 42 is connected to the tensioning mechanism base 43. The left front tongue pressing member 46 and the right front tongue pressing member 48 are respectively installed at the left and right ends of the tensioning mechanism base 43. The upper end of the left front tongue pressing member 46 is installed with a rotatable left tongue pressing and tightening member 45. The left tongue pressing and tightening member 45 is connected to the left tongue pressing and tightening member driving mechanism 44. The upper end of the right front tongue pressing member 48 is installed with a rotatable right tongue pressing and tightening member 47. The right tongue pressing and tightening member 47 is connected to the right tongue pressing and tightening member driving mechanism 49. During operation, the left front tongue pressing member 46 and the right front tongue pressing member 48 press the front tongue 17 of the preliminarily opened paper box or cardboard box. The tensioning cylinder 42 pushes the tensioning mechanism base 43 towards the paper box or cardboard box. The left tongue pressing and tightening member 45, the left front tongue pressing member 46, the right tongue pressing and tightening member 47, and the right front tongue pressing member 48 extend into the paper box or cardboard box. When the left front tongue pressing member 46 and the right front tongue pressing member 48 move to the crease position of the lower tongue 13, they stop advancing. Then, the left tongue pressing and tightening member driving mechanism 44 drives the left tongue pressing and tightening member 45 to rotate and lift, and the right tongue pressing and tightening member driving mechanism 49 drives the right tongue pressing and tightening member 47 to rotate and lift, thus completing the opening and shaping and tensioning actions of the paper box for subsequent processing.

[0045] To facilitate the discharging of the processed paper box or cardboard box, a semi-finished product ejecting cylinder 50 is further installed on the tensioning mechanism base 43. The two ejecting cylinders 50 are respectively fixed inside the left front tongue pressing member 46 or the right front tongue pressing member 48. The semi-finished product ejecting cylinder 50 can be fixed through the tensioning mechanism base 43, or fixed seats can be provided inside the left front tongue pressing member 46 or the right front tongue pressing member 48 to fix the semi-finished product ejecting cylinder 50. After the bottom of the paper box is folded, the semi-finished product ejecting cylinder 43 works, and the push rod of the semi-finished product ejecting cylinder 43 ejects the paper box or cardboard box out of the working station.

[0046] More particularly, a transverse positioning plate 461 is provided at the front end of the left front tongue pressing member 46, a transverse positioning plate is provided at the front end of the right front tongue pressing member 48, and transverse pressing arms 451 are provided at the front ends of the left tongue pressing and tightening member 45 and the right tongue pressing and tightening member 47. The transverse rods at the front ends of the left front tongue pressing member 46 and the right front tongue pressing member 48 are used to position the lower tongue crease and abut against the root of the lower tongue 13, and the pressing arms of the left tongue pressing and tightening member 45 and the right tongue pressing and tightening member 47 are used to position the upper tongue crease and abut against the root of the upper tongue 12. The left front tongue pressing member 46 and the left tongue pressing and tightening member 45 together complete the positioning of the left tongue crease, and the right front tongue pressing member 48 and the right tongue pressing and tightening member 47 together complete the positioning of the right tongue crease. Thus, the tensioning mechanism not only plays a role in tensioning, but also plays a role in positioning left and right.

[0047] More particularly, referring to Figure 9 and Figure 10 , the left tongue pressing and tightening member driving mechanism 44 includes a left tightening cylinder and a cylinder connecting member 441. The left tightening cylinder is installed on the tensioning mechanism base 43, and the left tightening cylinder is connected to the left tongue pressing and tightening member 45 through the cylinder connecting member 441. The left tongue pressing and tightening member 45 is installed on the left front tongue pressing member 46 through a pin shaft. The left tongue pressing and tightening member 45 includes a connecting arm 453 connected to the cylinder connecting member 441, a rotating arm 452 in the middle, and a pressing arm 451 at the front end. The structure of the right tongue pressing and tightening member 47 is the same as that of the left tongue pressing and tightening member 45, and the structure of the right tongue pressing and tightening member driving mechanism 49 is the same as that of the left tongue pressing and tightening member driving mechanism 44, with only the left-right symmetry difference.

[0048] Referring to Figures 11-13 , the bottom folding device 5 includes a lower tongue pressing mechanism 55 for folding the lower tongue 13, a right tongue pressing mechanism 52 for folding the right tongue 14, a left tongue pressing mechanism 54 for folding the left tongue 11, and an upper tongue pressing mechanism 53 for folding the upper tongue 12. A folding device bracket 51 is installed above the paper box folding station. The lower tongue pressing mechanism 55 is installed on the lower side of the folding device bracket 51 near the bottom of the box, the right tongue pressing mechanism 52 is installed on the right side, the left tongue pressing mechanism 54 is installed on the left side, and the upper tongue pressing mechanism 53 is installed on the upper side.

[0049] The structure of the lower tongue pressing mechanism 55 is as shown in Figure 13 , and it is composed of a lower tongue pressing cylinder, a lower tongue folding pressing plate 551, a hinge 552, and a cylinder connecting plate 554. One hinge of the hinge 552 is installed on the bottom plate of the folding station, and the other hinge of the hinge 552 is fixedly connected to the lower tongue folding pressing plate 551. The lower tongue folding pressing plate 551 is connected to the push rod of the lower tongue pressing cylinder 553 through the cylinder connecting plate 554. By driving the lower tongue folding pressing plate 551 to rotate around the hinge 552 by the lower tongue pressing cylinder 553, the action of folding the lower tongue 13 is completed.

[0050] The right tongue pressing mechanism 52 for folding the right tongue 14 is as shown in Figure 14As shown in the figure, the right tongue pressing mechanism 52 consists of a right pressing arm 521, a right pressing wheel fixing arm 522, a right pressing wheel 523 and a right tongue pressing cylinder. The right tongue pressing cylinder is connected to the right pressing arm 521. The front end of the right pressing arm 521 is connected to one end of the right pressing wheel fixing arm 522 through a connecting rod. The other end of the right pressing wheel fixing arm 522 is equipped with a right pressing wheel. The structure of the left tongue pressing mechanism 54 for folding the left tongue 11 is as Figure 15 shown. The left tongue pressing mechanism 4 consists of a left pressing arm, a left pressing wheel fixing arm, a left pressing wheel and a left tongue pressing cylinder. The left tongue pressing cylinder is connected to the left pressing arm. The front end of the left pressing arm is connected to one end of the left pressing wheel fixing arm through a connecting rod. The other end of the left pressing wheel fixing arm is equipped with a left pressing wheel. The right tongue pressing cylinder and the left tongue pressing cylinder are fixed by a folding device bracket 51. The right tongue pressing cylinder and the left tongue pressing cylinder respectively drive the right pressing arm 521 and the left pressing arm to reciprocate left and right, driving the right pressing wheel and the left pressing wheel to press the left tongue 11 and the right tongue 14 respectively. Pressing the left tongue 11 and pressing the right tongue 14 are carried out synchronously.

[0051] Refer to Figure 16 , the upper tongue pressing mechanism 53 consists of a vertical movement mechanism parallel to the bottom of the box and a horizontal movement mechanism that can push the upper tongue into the paper box. The vertical movement mechanism consists of a vertical cylinder 531 and a pressing upper tongue cylinder fixing plate 532. The vertical cylinder 531 is installed on the folding device bracket 51. The push rod of the vertical cylinder 531 is connected to the pressing upper tongue cylinder fixing plate 532. The horizontal movement mechanism consists of a horizontal cylinder 533 and a pressing upper tongue member 534. The horizontal cylinder 533 is fixed together with the pressing upper tongue cylinder fixing plate 532. The push rod of the horizontal cylinder 533 is connected to the pressing upper tongue member 534. The pressing upper tongue member 534 is driven by the vertical cylinder 531 to move downward by 90 degrees to fold the upper tongue, and then the horizontal cylinder 533 pushes the pressing upper tongue member 534 into the paper box 1, so that the upper tongue tip 121 of the upper tongue 12 passes through the lower tongue 13 and is pushed into the paper box 1. When the upper tongue pressing mechanism 53 resets, the bottom folding action of the paper box is completed.

[0052] Based on the above equipment for automatically opening and bottom folding of paper boxes or cartons, the steps of automatically opening and bottom folding of paper boxes or cartons will be described in detail below:

[0053] Step 1: The storage tank 3 fixes the four outer sides of the original state paper box or carton with four aluminum profiles. By controlling the operation of the pushing cylinder 21 of the pushing mechanism 2, the pushing plate 22 is driven to push the original state paper box 1 or carton ([[]] Figure 1 shown) dropped by the storage tank 3 into the working position. Each time the pushing mechanism pushes out the bottommost original state paper box or carton in the storage tank;

[0054] Step 2: Control the front tongue pressing cylinder to work, drive the front tongue pressing rod to extend and press the front tongue 17; control the folding side plate cylinder 62 to work, drive the box opening plate 61 to move, and the box opening plate 61 pushes the left side plate 15 of the paper box 1. When the left side plate 15 is perpendicular to the front tongue 17, the paper box 1 is opened. It is worth noting that a mechanism for blocking the right side plate 16 is provided on one side of the right side plate 16. In the present invention, the side plate of the folding device bracket 51 is used as the mechanism for blocking the right side plate 16;

[0055] Step 3: The tensioning mechanism works, the lifting cylinder 41 works, and drives the entire tensioning mechanism 4 to move, the left front tongue pressing member 46 and the right front tongue pressing member 48 press the front tongue 17, and the tensioning cylinder 42 is controlled to extend the push rod, and the tensioning mechanism base 43 and the components thereon are extended into the paper box 1 or carton together, until the right front tongue pressing member 48 presses the front end of the front tongue 17 on the lower tongue fold, and the left tongue pressing member driving mechanism 44 and the right tongue pressing member driving mechanism 49 are controlled to make the left tongue pressing member 45 and the right tongue pressing member 47 rotate horizontally, and the front ends of the left tongue pressing member 45 and the right tongue pressing member 47 just press on the upper tongue fold to complete the tensioning positioning;

[0056] Step 4: The lower tongue pressing cylinder is inflated, and the lower tongue pressing cylinder 553 drives the lower tongue folding plate 551 to rotate around the hinge 552, so that the lower tongue 13 is bent upward by 90°

[0057] Step 5: The right tongue pressing cylinder and the left tongue pressing cylinder work, and the right tongue pressing cylinder and the left tongue pressing cylinder respectively drive the right pressing arm and the left pressing arm to move, and drive the right pressing wheel and the left pressing wheel to press the left tongue 11 and the right tongue 14 respectively, and the left tongue 11 and the right tongue 14 are bent 90 degrees, and the lower halves of the left tongue 11 and the right tongue 14 block the two sides of the lower tongue 13;

[0058] Step six: control the vertical cylinder 531 to drive the horizontal cylinder 533 and the upper tongue pressing piece 534 to move downward 90° to fold the upper tongue 12, and then control the horizontal cylinder 533 to push the upper tongue pressing piece 534 to move into the paper box 1, so that the upper tongue tip 121 of the upper tongue 12 passes through the lower tongue 13 and is pushed into the paper box 1. The upper tongue pressing mechanism 53 is reset to complete the folding action of the bottom of the paper box.

[0059] Step 7: The cylinders of the folding side panel mechanism 6, the lower tongue pressing mechanism 55, the right tongue pressing mechanism 52, the left tongue pressing mechanism 54, and the upper tongue pressing mechanism 53 are reset, the front tongue pressing mechanism 7, the left tongue pressing member driving mechanism 44, and the right tongue pressing member driving mechanism 49 are reset, and the push rod of the semi-finished product ejection cylinder 50 is controlled to extend so that the bottom folded paper box 1 or carton is ejected from the station; then the tensioning mechanism 4 is reset. The next product processing is carried out.

[0060] By controlling the working states of each cylinder, the present invention can achieve the automatic opening and bottom folding of paper boxes or cartons, realizing the full automation, mechanization and unmanned operation of the opening and folding of paper boxes or cartons, and greatly improving the production efficiency.

[0061] The above-disclosed is only a preferred embodiment of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present invention still fall within the scope covered by the invention.

Claims

1. An apparatus for automatically opening and bottom folding a paper box or carton, characterized in that: It includes a pushing mechanism, an opening device and a bottom folding device. The pushing mechanism pushes a paper box or a cardboard box into the working station. The opening device is used to fix and open the paper box or the cardboard box. The bottom folding device folds the bottom box tongues of the paper box or the cardboard box. The bottom folding device includes a lower tongue pressing mechanism for folding the lower tongue, a left tongue pressing mechanism for folding the left tongue, a right tongue pressing mechanism for folding the right tongue and an upper tongue pressing mechanism for folding the upper tongue. The upper tongue pressing mechanism is composed of a vertical movement mechanism parallel to the box bottom and a horizontal movement mechanism that can push the upper tongue into the paper box; The vertical movement mechanism is composed of a vertical cylinder and a fixing plate for the upper tongue pressing cylinder. The vertical cylinder is installed on the folding device bracket. The push rod of the vertical cylinder is connected to the fixing plate for the upper tongue pressing cylinder. The horizontal movement mechanism is composed of a horizontal cylinder and an upper tongue pressing member. The horizontal cylinder is fixed together with the fixing plate for the upper tongue pressing cylinder. The push rod of the horizontal cylinder is connected to the upper tongue pressing member. The vertical cylinder pushes the assembly formed by the fixing plate for the upper tongue pressing cylinder, the horizontal cylinder and the upper tongue pressing member to move downward to bend the upper tongue by 90 degrees. Then the horizontal cylinder pushes the upper tongue pressing member to move into the box to insert the tip of the upper tongue into the inner side of the lower tongue; The opening device is composed of a front tongue pressing mechanism for pressing the front tongue of the paper box or the cardboard box, a side plate folding mechanism for erecting the left side plate, and a tensioning mechanism that extends into the opened paper box or cardboard box to fully open and position the paper box or cardboard box; The tensioning mechanism includes a tensioning mechanism base, a tensioning cylinder, a driving mechanism for the left tongue pressing and tightening member, a left tongue pressing and tightening member, a left front tongue pressing member, a right tongue pressing and tightening member, a right front tongue pressing member and a driving mechanism for the right tongue pressing and tightening member. The tensioning cylinder is connected to the tensioning mechanism base. The left front tongue pressing member and the right front tongue pressing member are respectively installed at the left and right ends of the tensioning mechanism base. The upper end of the left front tongue pressing member is installed with a rotatable left tongue pressing and tightening member. The left tongue pressing and tightening member is connected to the driving mechanism for the left tongue pressing and tightening member. The upper end of the right front tongue pressing member is installed with a rotatable right tongue pressing and tightening member. The right tongue pressing and tightening member is connected to the driving mechanism for the right tongue pressing and tightening member.

2. The device for automatically opening and bottom folding of a paper box or carton according to claim 1, characterized in that: The lower tongue pressing mechanism is composed of a lower tongue pressing cylinder, a lower tongue folding pressing plate, a hinge and a cylinder connecting plate. One of the hinges of the hinge is installed on the bottom plate of the folding station. The other hinge of the hinge is fixedly connected to the lower tongue folding pressing plate. The lower tongue folding pressing plate is connected to the push rod of the lower tongue pressing cylinder through the cylinder connecting plate. The lower tongue folding pressing plate is driven by the lower tongue pressing cylinder to rotate around the hinge to automatically fold the lower tongue.

3. The device for automatically opening and bottom folding of a paper box or cardboard box according to claim 1, characterized in that: The right tongue pressing mechanism is composed of a right pressing arm, a right pressing wheel fixing arm, a right pressing wheel and a right tongue pressing cylinder. The right tongue pressing cylinder is connected to the right pressing arm. The front end of the right pressing arm is connected to one end of the right pressing wheel fixing arm through a connecting rod. The other end of the right pressing wheel fixing arm is installed with a right pressing wheel. The left tongue pressing mechanism is composed of a left pressing arm, a left pressing wheel fixing arm, a left pressing wheel and a left tongue pressing cylinder. The left tongue pressing cylinder is connected to the left pressing arm. The front end of the left pressing arm is connected to one end of the left pressing wheel fixing arm through a connecting rod. The other end of the left pressing wheel fixing arm is installed with a left pressing wheel. The right tongue pressing cylinder and the left tongue pressing cylinder respectively drive the right pressing arm and the left pressing arm to reciprocate left and right, driving the right pressing wheel and the left pressing wheel to automatically fold the left tongue and the right tongue respectively.

4. The device for automatically opening and bottom folding of a paper box or carton according to claim 1, characterized in that: The pushing mechanism is installed on the left side of the storage tank. The storage tank is formed by connecting four aluminum profiles into one body, forming a bracket that can position the four outer sides of the original state paper box or cardboard box, and is installed on the workbench. Each time the pushing mechanism ejects an original state paper box or cardboard box at the bottom of the storage tank.

5. An automatic opening and bottom folding method for a paper box or carton, based on the device according to any one of claims 1-4, characterized in that: The pushing mechanism pushes the paper box or cardboard box in the original state into the working station. Each time the pushing mechanism ejects an original state paper box or cardboard box at the bottom of the storage tank. The front tongue pressing mechanism presses the front tongue of the paper box or cardboard box. The side plate folding mechanism pushes the side plate of the paper box or cardboard box to open the paper box or cardboard box. The tensioning mechanism extends into the paper box or cardboard box to completely open and position the paper box or cardboard box. The bottom folding device first folds down the lower tongue, then folds the left tongue and the right tongue, and finally folds the upper tongue and inserts the tip of the upper tongue into the inner side of the lower tongue, thereby completing the automatic bottom folding of the paper box or cardboard box. Fold the lower tongue in place, then fold the left tongue and the right tongue in place. The lower halves of the left tongue and the right tongue block both sides of the lower tongue. After that, fold the upper tongue. The two sides of the upper tongue block the upper halves of the left tongue and the right tongue. Finally, push the tip of the upper tongue inward. The tip of the upper tongue is inserted into the box and blocked by the lower tongue, so that the lower tongue, the left tongue, the right tongue and the upper tongue are buckled together to complete the folding. After the bottom folding is completed, the semi-finished product ejecting cylinder ejects the paper box or cardboard box with the bottom folded out of the working station, and then proceeds to the next paper box or cardboard box opening and bottom folding process.

6. The automated opening and bottom folding method of the paper box or carton according to claim 5, characterized in that: The tensioning mechanism positions the creases of the lower tongue, the left tongue and the right tongue. The tensioning mechanism is provided with a left tongue pressing and tightening part and a right tongue pressing and tightening part that can be contracted or opened. After the left tongue pressing and tightening part and the right tongue pressing and tightening part extend into the paper box or cardboard box, they open, and the front ends are pressed on the crease position of the upper tongue to achieve the positioning of the upper tongue crease.

Images