Paper box folding mechanism

Abstract

The present invention provides a paper box folding mechanism, comprising: a folding guide bottom frame and a supporting structure connected to the folding guide bottom frame. The supporting structure comprises a plurality of folding guide wheel members, and the plurality of folding guide wheel members are mounted on one side, two opposite sides, three sides, or all four sides of the folding guide bottom frame. According to the described solution, the folding guide wheel members are arranged on the folding guide bottom frame, and sliding friction between a sidewall of a paper box to be folded and the folding guide wheel members is converted into rolling friction, thereby reducing the problem of indentations generated on the paper box due to being compressed by the supporting structure in the process of folding. As can be seen, the paper box folding mechanism of the described solution solves the problem of indentations on or even damage to outer sidewalls of a paper box which is highly likely to be caused by compression and friction typically occurring between the outer sidewalls of the paper box and a supporting structure in the process of downward pressing. Moreover, said paper box folding mechanism has the advantages of compact structure, convenient adjustment, reduced time and labor, high in-use stability, and reduced damage to paper boxes.

Description

A paper box folding mechanism Technical Field

[0001] The invention relates to a carton folding tool, in particular to a carton folding mechanism. Background Art

[0002] Airplane boxes are a branch of cardboard boxes. They are made of corrugated paper and have a very high cost-effectiveness. They are widely used in product packaging and express packaging.

[0003] Related art carton folding mechanisms typically include a folding frame and a support structure mounted on the folding frame. During the folding process, the unfolded carton is placed on the folding mechanism. Then, the folding mechanism presses downward, guiding and supporting the unfolded carton under the support structure. However, during this downward pressure, the outer wall of the carton often squeezes and rubs against the support structure, easily causing indentations or even damage to the outer wall. Summary of the Invention

[0004] The first purpose of the present invention is to provide a paper box folding mechanism, which solves the problem that the outer wall of the paper box is usually squeezed and rubbed against the supporting structure during the downward pressing process, which easily causes indentations on the outer wall of the paper box or even damages it. It has the advantages of compact structure, convenient adjustment, time and labor saving, strong stability in use, and little damage to the paper box.

[0005] In order to achieve the above-mentioned purpose, the present invention provides the following technical solution: a paper box folding mechanism, comprising: a folding guide bottom frame and a supporting structure connected to the folding guide bottom frame, the supporting structure comprising a plurality of folding guide wheel components, and the plurality of folding guide wheel components are evenly distributed on a single side, two pairs of sides, three sides or four sides of the folding guide bottom frame.

[0006] In one embodiment, the folding guide wheel assembly includes: a folding guide seat, wherein the upper inner portion of the folding guide seat is provided with a folding guide arc surface; and a bearing roller rotatably assembled with the folding guide seat, wherein the outer circumferential surface of the bearing roller is higher than the folding guide arc surface.

[0007] In one embodiment, the support structure further includes a support device, which includes folding guide limiting plates arranged on both sides of the rear end of the folding guide bottom frame.

[0008] In one embodiment, the folding guide bottom frame includes: a pair of transverse supporting rails, a pair of longitudinal supporting rails and a connecting plate; the connecting plate connects the transverse supporting rails and the longitudinal supporting rails, and the transverse supporting rails and the longitudinal supporting rails are arranged to form a U-shaped frame structure.

[0009] In one embodiment, the support structure also includes a box cover pressing assembly arranged at the rear end of the folding guide limit plate, and the lower end of the box cover pressing assembly is provided with a hand-tightened adjustment screw that is pressed and limited with the longitudinal support slide rail, and the upper end of the box cover pressing assembly is fixed with a screw and a transverse support slide rail by inserting and pressing.

[0010] In one embodiment, the connecting plate includes a base plate I, the box cover pressing assembly includes a pressure rod arranged on the base plate I, and an ear plate seat is provided between the front end of the pressure rod and the base plate I and is pin-connected and fixed to the pressure rod.

[0011] In one embodiment, a support adjustment screw is provided between the rear end of the pressure rod and the base plate I to provide height support for the pressure rod, and a buffer rubber cap is provided between the upper end of the support adjustment screw and the pressure rod to be sleeved with the support adjustment screw.

[0012] In one embodiment, a foam support bottom plate is provided in the fold guide bottom frame and is nested, connected and fixed with the fold guide bottom frame.

[0013] Analysis shows that the carton folding mechanism provided by the present invention converts the sliding friction between the side walls of the carton to be folded and the folding guide wheel members into rolling friction, thereby reducing the problem of the carton being squeezed and indented by the support structure during the folding process. This solution solves the problem that the outer wall of the carton is usually squeezed and rubbed against the support structure during the downward pressing process, which can easily cause indentations on the outer wall of the carton, or even damage and damage. It has the advantages of compact structure, convenient adjustment, time and labor saving, strong stability in use, and minimal damage to the carton.

[0014] The second object of the present invention is to provide another carton folding mechanism, which, by providing a supporting part on the supporting device that can rotate relative to the folding frame, can not only facilitate the folding of the carton and improve the quality of the aircraft box after forming, but also can directly place the product to be packaged into the carton for boxing operation, effectively improving the folding efficiency of the carton, and can also reduce the obstacles and difficulties when taking out the carton, which is conducive to taking out the folded carton.

[0015] In order to achieve the above-mentioned objectives, the present invention provides the following technical solutions: a paper box folding mechanism, comprising: a folding guide bottom frame and a supporting structure, wherein the supporting structure is connected to the folding guide bottom frame, and the supporting side of the supporting structure extends away from one side of the folding guide bottom frame, and the supporting structure is arranged to form a folding area; the supporting structure includes a supporting device, a fixed part of the supporting device is fixedly connected to the folding guide bottom frame, and the supporting part of the supporting device can rotate relative to the fixed part; during the paper box folding process, when the paper box is pressed toward the folding area to a preset position, the supporting part of the supporting device flips toward the outside of the folding area.

[0016] In one embodiment, the paper box has a swing cover, and the supporting device is used to support and assist the swing cover in folding, the fixed part includes a mounting seat, and the supporting part includes a folding guide limit plate; the supporting device also includes: a power source, including a main body part and a power output part connected to the main body part, the main body part is fixedly assembled with the folding guide bottom frame, the mounting seat is arranged on the side of the power output part away from the main body part, and is fixedly assembled with the folding guide bottom frame; and a transmission assembly, rotatably assembled on the mounting seat, the end of the transmission assembly close to the main body part is connected to the power output part, the folding guide limit plate is fixedly connected to the end of the transmission assembly away from the power source, and the folding guide limit plate can move synchronously with the transmission assembly.

[0017] In one embodiment, the supporting device further includes: a sensor and a control box, wherein the sensor is mounted on the folding guide bottom frame and is connected to the control box via a wire, and the control box is electrically connected to the power source; during the carton folding process, when the sensor detects that there is a carton in the folding area, the control box controls the power source to drive the folding guide limit plate to flip outward.

[0018] In one embodiment, the transmission assembly includes: a transmission shaft, which is movably arranged through the mounting seat; a connecting member, one end of which is fixedly connected to the power output part, and the other end of which is fixedly connected to the end of the transmission shaft close to the power source; and a fixing member, which is sleeved on the end of the transmission shaft away from the connecting member and fixedly connected to the transmission shaft, and the transmission shaft is fixedly connected to the folding guide limit plate through the fixing member, so that the folding guide limit plate can rotate synchronously with the transmission shaft.

[0019] In one embodiment, the transmission assembly includes: a transmission shaft, which is movably passed through the mounting seat; a guide seat, which is fixedly mounted on the folding guide bottom frame, and a guide groove is provided on the guide seat; a transmission rack, which is slidably mounted in the guide groove, and the side of the transmission rack close to the power source is fixedly connected to the power output part; a transmission gear, which is sleeved and fixed on one end of the transmission shaft close to the transmission rack, and the transmission gear is engaged with the transmission rack to convert the linear motion of the transmission rack into rotation of the transmission shaft; and a fixing member, which is sleeved on one end of the transmission shaft away from the transmission gear and fixedly connected to the transmission shaft, and the transmission shaft is fixedly connected to the folding guide limit plate through the fixing member, so that the folding guide limit plate can rotate synchronously with the transmission shaft.

[0020] In one embodiment, the support structure also includes a first support assembly fixedly assembled with the folding guide bottom frame, the first support assembly is arranged on the side of the folding guide limit plate away from the power source, the first support assembly includes a first support seat, and the end of the transmission assembly away from the power source passes through the folding guide limit plate and is rotatably assembled with the side of the first support seat close to the folding guide bottom frame.

[0021] In one embodiment, the folding guide bottom frame includes: two mutually parallel transverse support rails and two mutually parallel longitudinal support rails, the two transverse support rails and the two longitudinal support rails are respectively located in two mutually parallel planes and intersect with each other to form a plurality of intersections; each intersection is provided with a connecting plate, each connecting plate is located between the transverse support rail and the longitudinal support rail, each connecting plate is slidably connected to the corresponding transverse support rail and the longitudinal support rail, and each connecting plate can be selectively fixed in position on the transverse support rail and the longitudinal support rail; the fixed part of the support device is fixedly connected to the connecting plate.

[0022] In one embodiment, the connecting plate includes: a base plate I and a base plate II, the base plate I is arranged opposite to the base plate II, the fixed part of the support device and the first support assembly are fixedly connected to the base plate I, and can move synchronously with the base plate I; the support structure also includes a second support assembly installed on the base plate II, the second support assembly includes: a second support seat, a rotating pressure member and a rotating connecting member; the second support seat is fixedly connected to the base plate II, the rotating pressure member is installed on the second support seat and can rotate relative to the second support seat; the rotating connecting member has a first end and a second end, the first end is connected to the second support seat, and the second end is connected to the rotating pressure member; during the folding process of the carton, when the carton is pressed toward the folding area, at least a part of the carton can drive the rotating pressure member to rotate, so that the rotating pressure member is pressed against the outer wall of the carton, and pushes the part of the carton to be folded toward the side close to the base plate I.

[0023] In one embodiment, the rotating pressing member includes: a driving portion, at least a portion of which protrudes from the end surface of the second support seat close to the bottom plate I; a pressing portion, connected to the driving portion, and the pressing portion has a flattening end surface. Under the drive of the driving portion, the flattening end surface is pressed against the outer wall of the paper box and pushes the part to be folded of the paper box toward the side close to the bottom plate I; and a counterweight portion, connected to the side of the pressing portion away from the driving portion. After the paper box is folded and taken out, the counterweight portion resets the rotating pressing member by its own gravity.

[0024] In one embodiment, a rolling element is provided on the second support seat, wherein the rolling element partially protrudes from the end surface of the second support seat close to the folding area, and the rolling element can roll relative to the second support seat, thereby converting the sliding friction between the paper box and the second support seat during the folding process into rolling friction.

[0025] Analysis shows that the present invention provides a carton folding mechanism, which provides a supporting part that can rotate relative to the folding frame on the supporting device. During the folding process of the carton, the supporting part of the supporting device can be turned outward after assisting the rear swing cover to fold, so that the supporting end of the supporting part is turned to a position away from the folding area A. The supporting device provided in this way can, on the one hand, thicken the supporting part, thereby reducing the situation of inserting into the gap between the rear swing cover and the side wings, ensuring that the carton can be smoothly pressed down and folded; on the other hand, it can facilitate the folding of the rear swing cover, side wings and rear support plate into place, thereby improving the quality of the carton after forming; in addition, after the supporting part is turned outward, the carton can directly fold the flaps, top cover and closing cover together in the folding mechanism, and the product to be packaged can be directly placed in the carton and then folded during the folding process, so that the product boxing operation can be directly completed, effectively improving the folding efficiency of the carton. At the same time, after the supporting part is turned outward, it can also reduce the obstacles and difficulties when taking out the carton, which is conducive to taking out the folded carton.

[0026] A third object of the present invention is to provide another paper box folding mechanism that features a compact structure, convenient adjustment, time-saving and labor-saving features, and strong operational stability. This mechanism solves the problem of rapidly folding paper boxes of varying specifications. Furthermore, it can achieve rapid, indentation-free folding of paper boxes of the same specification with dimensional variations, thus preventing damage to the paper boxes caused by dimensional deviations.

[0027] In order to achieve the above-mentioned purpose, the present invention provides the following technical solution: a paper box folding mechanism, comprising a folding guide bottom frame and a supporting structure connected to the folding guide bottom frame, the supporting structure comprising a stop assembly arranged on both sides of the front end of the folding guide bottom frame, the stop assembly comprising a stop block, a stop block slide rail connected to the folding guide bottom frame is provided between the stop block and the folding guide bottom frame, the stop block can slide on the stop block slide rail and can be selectively fixed in the sliding position.

[0028] In one embodiment, the block slide rail includes a block main slide rail, a telescopic slide rail is provided in the block main slide rail and is movably inserted and limited with the block main slide rail, the block is movably inserted with the telescopic slide rail, the block is movably socketed with the block main slide rail, and a support column is provided between the lower end of the telescopic slide rail and the folding guide bottom frame.

[0029] In one embodiment, the supporting structure also includes a supporting device, which includes a folding guide limit plate arranged on both sides of the rear end of the folding guide bottom frame, and a folding guide limit plate mounting slider is provided between the folding guide limit plate and the folding guide bottom frame, which is movably plugged and fixed to the folding guide bottom frame.

[0030] In one embodiment, the support structure further includes a box cover pressing assembly arranged at the rear end of the folding guide limit plate, and connecting plates are provided between the box cover pressing assembly and the folding guide bottom frame and between the stop assembly and the folding guide bottom frame.

[0031] In one embodiment, the rear end of the block is provided with a block limit slider which is pressed against the telescopic slide rail, and the block limit slider, the folding guide limit plate mounting slider and the connecting plate are all provided with hand-tightened adjustment screws for sliding and tightening the limit.

[0032] Analysis shows that the carton folding mechanism provided by the present invention achieves adjustable position by slidably mounting a stop block on a stop block rail and selectively fixing the stop block in its slid position. This allows the stop block assembly to accommodate cartons of varying sizes, improving its adaptability. This solves the problem of rapidly folding cartons of varying sizes. Furthermore, even cartons of the same specification with dimensional deviations can be folded quickly and without indentation, preventing damage to the cartons caused by dimensional deviations.

[0033] The fourth purpose of the present invention is to provide another paper box folding mechanism, which is used to solve the technical problem that the end of the swing cover and the side wings are prone to conflict during the folding process, the folding process is not smooth, and the folding efficiency is affected. The mechanism has a position correction function and a limiting function, and the folding process is smoother, the paper box damage rate is small, and the paper box folding efficiency is high.

[0034] In order to achieve the above-mentioned objectives, the present invention provides the following technical solutions: a paper box folding mechanism, comprising a folding guide bottom frame and a supporting structure connected to the folding guide bottom frame, the supporting structure comprising two stop assemblies and two supporting devices, the two stop assemblies each comprising a fixed baffle, the fixed baffle being arranged on the first side of the folding guide bottom frame, the two supporting devices each comprising a folding guide limit plate, the folding guide limit plate being arranged on the second side of the folding guide bottom frame; the first side is opposite to the second side, and the two fixed baffles and the two folding guide limit plates are each arranged to form a quadrilateral folding area; wherein the stop assembly comprises at least one of the fixed baffles, the end face of which is opposite to the corresponding supporting device and is provided with a guide surface, the guide surface being an inclined plane or an arc surface transitioning from the upper end to the lower end, so that the lower end of the guide surface is closer to the folding area.

[0035] In one embodiment, a stopper slide rail is provided at the upper end of the fixed baffle, and an arc-shaped guide surface is provided on a side of the stopper slide rail close to the folding area, and the arc-shaped guide surface faces the other fixed baffle.

[0036] In one embodiment, a third sliding groove is provided on the top of the fixed baffle, and a first limiting portion is provided on the bottom of the block slide rail. The first limiting portion slides in the third sliding groove, so that the block slide rail is slidably connected to the fixed baffle.

[0037] In one embodiment, the block slide rail includes a block main slide rail, the arc-shaped guide surface is arranged on the block main slide rail, the first limiting portion is arranged at the bottom of the block main slide rail, and a block is slidably connected to the block main slide rail.

[0038] In one embodiment, the block slide rail further includes a telescopic slide rail, which is sleeved on the block main slide rail, and the block main slide rail is slidably connected to the telescopic slide rail via a first bolt; or / and, the block is detachably connected with an additional block.

[0039] In one embodiment, at least one first folding guide wheel is movably installed between the two fixed baffles; at least one second folding guide wheel is movably installed between the two folding guide limit plates; and at least one third folding guide wheel is movably installed between the opposite fixed baffles and the folding guide limit plates.

[0040] In one embodiment, a first roller is installed on a side of the first folding guide wheel member close to the folding area; and a third roller is installed on a side of the third folding guide wheel member close to the folding area.

[0041] In one embodiment, the first folding guide wheel is higher than the third folding guide wheel; during the folding process of the paper box, the third roller abuts against the paper box before the first roller, so that the side wings of the paper box are folded into place before the front support plate.

[0042] In one embodiment, at least one ear plate seat is provided between the two folding guide limit plates; a pressure rod is hinged on the ear plate seat, and a stop block is movably connected to the pressure rod; and / or a rotating assembly is provided at the upper end of the ear plate seat, and an open-ended clearance groove is provided at one end of the rotating assembly, and the hinged end of the ear plate seat is placed in the clearance groove and hinged to the rotating assembly; the pressure rod is fixedly installed on the other end of the rotating assembly, so that the pressure rod is in a straight line with the center line of the ear plate seat.

[0043] In one embodiment, the folding guide bottom frame includes two mutually parallel transverse support rails and two mutually parallel longitudinal support rails, and the two transverse support rails and the two longitudinal support rails are respectively located in the upper and lower surfaces and intersect with each other; the transverse support rails and the longitudinal support rails are provided with connecting plates at each intersection, and the connecting plates are respectively slidably connected to the corresponding transverse support rails and the longitudinal support rails, and the connecting plates can selectively fix their positions on the transverse support rails and the longitudinal support rails.

[0044] Analysis shows that the present invention provides a paper box folding mechanism, which is provided with two fixed baffles and two folding guide limit plates, and a quadrilateral folding area is formed by the two fixed baffles and the two folding guide limit plates. At the same time, a guide surface is provided on the fixed baffle to correct the position of the paper box during the downward pressing process, thereby solving the problem of damage caused by the position offset of the paper box during the folding process. It has a position correction function and a limiting function, the folding process is smoother, the damage rate of the paper box can be reduced, and the folding efficiency of the paper box is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The drawings and the accompanying drawings, which constitute part of this application, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an undue limitation of the present invention. Among them:

[0046] FIG1 is a schematic diagram of the first overall structure of the carton folding mechanism in Example 1 of the present application.

[0047] FIG2 is a second overall structural diagram of the carton folding mechanism in Example 1 of the present application.

[0048] FIG3 is a third overall structural diagram of the carton folding mechanism in Example 1 of the present application.

[0049] FIG4 is a side view of the carton folding mechanism in Example 1 of the present application.

[0050] FIG5 is a top view of the carton folding mechanism in Example 1 of the present application.

[0051] FIG6 is a side view of the carton folding mechanism in Example 2 of the present application.

[0052] FIG7 is a top view of the carton folding mechanism in Example 2 of the present application.

[0053] FIG8 is a schematic diagram of the overall structure of the carton folding mechanism in Example 2 of the present application.

[0054] FIG9 is a bottom view of the carton folding mechanism in Example 2 of the present application.

[0055] Figure 10 is a schematic diagram of the top view of the carton folding mechanism in Example 3 of the present application.

[0056] Figure 11 is a schematic diagram of the three-dimensional structure of the carton folding mechanism in Example 3 of the present application.

[0057] FIG12 is a schematic diagram of the first structure of the stop assembly in Example 3 of the present application.

[0058] FIG13 is a schematic diagram of the second structure of the stop assembly in Example 3 of the present application.

[0059] FIG14 is a schematic diagram of a third structure of the stop assembly in Example 3 of the present application.

[0060] FIG15 is a schematic diagram of the exploded structure of the stop assembly in Example 3 of the present application.

[0061] Figure 16 is a schematic diagram of the planar structure of the paperboard before the carton is folded in Example 3 of the present application.

[0062] FIG17 is a schematic structural diagram of a first state of a cardboard placed on a carton folding mechanism in Example 3 of the present application.

[0063] FIG18 is a schematic structural diagram of a second state of a cardboard placed on a carton folding mechanism in Example 3 of the present application.

[0064] Figure 19 is a structural diagram of the carton folding mechanism and paperboard in Example 4 of the present application.

[0065] Figure 20 is a schematic diagram of the first structure of the carton folding mechanism in Example 4 of the present application.

[0066] FIG21 is a schematic diagram of the carton folding mechanism in the related art of this application after the cardboard is pressed down.

[0067] Figure 22 is a structural diagram of the supporting part of the carton folding mechanism in the related art of this application when it is stuck in the gap between the rear swing cover and the side wings.

[0068] Figure 23 is a structural schematic diagram of the carton folding mechanism in Example 4 of the present application after the carton is pressed down.

[0069] Figure 24 is a second structural schematic diagram of the carton folding mechanism in Example 4 of the present application.

[0070] Figure 25 is a top view of the carton folding mechanism in Example 4 of the present application.

[0071] Figure 26 is a schematic diagram of the first structure of the bottom plate I in Example 4 of the present application.

[0072] Figure 27 is a schematic diagram of the second structure of the bottom plate I in Example 4 of the present application.

[0073] Figure 28 is a schematic diagram of the first structure of the bottom plate II in Example 4 of the present application.

[0074] Figure 29 is a schematic diagram of the second structure of the bottom plate II in Example 4 of the present application.

[0075] FIG. 30 is an enlarged view corresponding to detail B in FIG. 24 .

[0076] Figure 31 is a structural schematic diagram of the support device, base plate I, transverse support rails and longitudinal support rails in Example 4 of the present application.

[0077] Figure 32 is an exploded view of the support device, base plate I, transverse support rails and longitudinal support rails in Example 4 of the present application.

[0078] Figure 33 is an exploded view of the support device in Example 4 of the present application.

[0079] Figure 34 is a structural diagram of the second support assembly and base plate I, transverse support rails, and longitudinal support rails in Example 4 of the present application.

[0080] Figure 35 is a schematic diagram of the second support assembly in a natural state in Example 4 of the present application.

[0081] Figure 36 is a schematic diagram of the second support assembly in a flattened state in Example 4 of the present application.

[0082] Figure 37 is an exploded view of the second support assembly in Example 4 of the present application.

[0083] Figure 38 is a structural diagram of the paper box folding mechanism in Example 5 of the present application.

[0084] Figure 39 is a structural schematic diagram of the support device, base plate I, transverse support rails and longitudinal support rails in Example 5 of the present application.

[0085] Figure 40 is a structural schematic diagram of the support device, base plate I, transverse support rails and longitudinal support rails in Example 5 of the present application.

[0086] Figure 41 is an exploded view of the support device in Example 5 of the present application.

[0087] Explanation of the accompanying drawings: 1. Folding guide bottom frame; 11. Horizontal supporting slide rail; 12. Longitudinal supporting slide rail; 13. Connecting plate; 131. Bottom plate I; 1310. First limiting groove; 1311. First convex strip; 1312. Second convex strip; 1313. Second limiting strip; 132. Bottom plate II; 1321. Third convex strip; 1322. Fourth convex strip; 1323. Third limiting strip; 2. Support structure; 21. Support device; 211. Power source; 2111. Main body; 2112. Power output part; 212. Mounting seat; 2121. First limiting strip; 213. Transmission assembly; 2130. Guide groove; 2131. Transmission shaft; 2132. Connecting member; 2133. Fixing member; 2134. Guide seat; 2135. Transmission rack; 2136. Transmission gear; 214. Folding Guide limit plate; 2140, mounting hole; 2141, mounting portion; 2142, avoidance port; 215, sensor; 216, control box; 217, folding guide limit plate mounting slider; 22, first support assembly; 221, first support seat; 2210, second limiting slot; 23, second support assembly; 231, second support seat; 2310, third limiting slot; 232, rotating pressing member; 2320, flattening end surface; 2321, driving portion; 2322, pressing portion; 2323, counterweight portion; 233, rotating connecting member; 234, rolling member; 24, folding guide wheel member; 24a, first folding guide wheel member; 24b, second folding guide wheel member; 24c, third folding guide wheel member ; 241, folding guide seat; 2410, folding guide arc surface; 242, bearing roller; 242a, first roller; 242b, second roller; 242c, third roller; 25, box cover pressing assembly; 251, ear plate seat; 252, rotating assembly; 2521, give way; 253, pressure rod; 254, support adjustment screw; 255, stop block; 256, buffer rubber cap; 26, third support assembly; 261, third support seat; 27, stop assembly; 271, fixed baffle; 2710, guide surface; 2711, third slide; 272, stop block; 2720, limit groove; 2721, second bolt; 2722, first connecting hole; 273, Block slide rail; 2731, block main slide rail; 2731a, first limiting part; 2732, telescopic slide rail; 2732a, first slide groove; 2732b, second slide groove; 2733, first bolt; 274, support column; 275, block limiting slider; 276, additional block; 2760, second connecting hole; 2761, second limiting part; 3, cardboard; 31, bottom plate; 32, front support plate; 33, rear support plate; 34, front rocker cover; 35, rear rocker cover; 36, side wing; 361, side wing fold line; 362, snap-on key; 363, snap-on groove; 37, flap; 38, top cover; 39, closing cover; 4, wire; 5, foam support bottom plate; 6, hand screw. DETAILED DESCRIPTION

[0088] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments. Each example is provided by way of explanation of the present invention and is not intended to limit the present invention. Indeed, it will be apparent to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is intended that the present invention encompasses such modifications and variations as come within the scope of the appended claims and their equivalents.

[0089] In the description of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected", "connected", and "set" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components; they can be wired electrical connections, radio connections, or wireless communication signal connections. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0090] One or more examples of the present invention are shown in the accompanying drawings. The detailed description uses numerical and letter designations to refer to features in the drawings. Like or similar designations in the drawings and the description have been used to refer to like or similar parts of the present invention. As used herein, the terms "first," "second," and "third," etc. are used interchangeably to distinguish one component from another and are not intended to indicate the position or importance of an individual component.

[0091] Example 1:

[0092] Referring to Figures 1 to 5, this embodiment provides a carton folding mechanism, which is mainly used to fold an airplane box, simplify the folding operation of the airplane box, and improve the folding efficiency of the airplane box. Next, this embodiment describes the airplane box as the folding object of the carton folding mechanism.

[0093] The carton folding mechanism includes a folding guide bottom frame 1 and a supporting structure 2 connected to the folding guide bottom frame 1. The upper end of the folding guide bottom frame 1 is provided with a plurality of folding guide wheel components 24 that are movably inserted and fixed to the folding guide bottom frame 1 by screws. The folding guide wheel components 24 are evenly distributed on a single side, two pairs of sides, three sides or four sides of the folding guide bottom frame 1.

[0094] 1 to 5 , the folding guide wheel 24 includes a folding guide seat 241 , the inner upper portion of which is provided with a folding guide arc surface 2410 that is integrated with the folding guide seat 241 . A bearing roller 242 is provided on the side of the folding guide seat 241 , and the outer circumference of the bearing roller 242 is higher than the folding guide arc surface 2410 .

[0095] Furthermore, a foam support bottom plate 5 is provided in the fold guide bottom frame 1 and is nested, connected and fixed with the fold guide bottom frame 1 .

[0096] Furthermore, the folding guide bottom frame 1 includes: a pair of transverse supporting rails 11 and a pair of longitudinal supporting rails 12, and the pair of transverse supporting rails 11 and the pair of longitudinal supporting rails 12 are surrounded to form a U-shaped frame structure.

[0097] In this embodiment, the folding guide base frame 1 further includes a connecting plate 13, which is disposed at the intersection of the pair of transverse support rails 11 and the pair of longitudinal support rails 12, and is used to connect the transverse support rails 11 and the longitudinal support rails 12. Specifically, the connecting plate 13 includes two bottom plates I 131 and two bottom plates II 132, and the two bottom plates I 131 and the two bottom plates II 132 are slidably assembled with the transverse support rails 11 and the longitudinal support rails 12, respectively.

[0098] 1 to 5 , in this embodiment, the support structure 2 further includes a support device 21 and stopper components 27 disposed on both sides of the front end of the folding guide bottom frame 1. The support device 21 includes folding guide limit plates 214 disposed on both sides of the rear end of the folding guide bottom frame 1.

[0099] Specifically, the stop assembly 27 includes a fixed baffle 271, a baffle 272 is provided at the upper end of the fixed baffle 271, a baffle slide rail 273 is provided between the baffle 272 and the fixed baffle 271, and a support column 274 is provided at the rear end of the baffle slide rail 273, which is screw-inserted and crimped to the longitudinal support slide rail 12, and a base plate Ⅱ132 is provided at the lower end of the support column 274, which is screw-crimped and fixed to the transverse support slide rail 11, and the longitudinal support slide rail 12 and the support column 274 are fixed by screws.

[0100] Continuing with Figures 1 to 5 , the rear ends of both folding guide limit plates 214 are each provided with a lid pressing assembly 25. The lower end of the lid pressing assembly 25 is provided with a hand-tightened adjustment screw 6 that presses against the longitudinal support rail 12, and the upper end of the lid pressing assembly 25 is secured to the transverse support rail 11 by screws. The lid pressing assembly 25 includes a pressure rod 253 mounted on the base plate I 131. A lug plate seat 251 is provided between the front end of the pressure rod 253 and the base plate I 131, and is pin-connected to the pressure rod 253. A support adjustment screw 254 is provided between the rear end of the pressure rod 253 and the base plate I 131, providing height support for the pressure rod 253. A cushioning rubber cap 256 is provided between the upper end of the support adjustment screw 254 and the pressure rod 253, and is sleeved onto the support adjustment screw 254.

[0101] Working Principle: The stopper assembly 27, folding guide limit plate 214, and lid pressing assembly 25 are installed on the folding guide base frame 1, which consists of a pair of transverse support rails 11 and a pair of longitudinal support rails 12, according to the length and width of the folding guide base frame 1. Next, folding guide wheels 24 are installed on two or four opposite sides of the folding guide base frame 1. Subsequently, the unfolded folding guide is placed horizontally along the folding guide wheels 24 into the carton folding mechanism, restrained by the folding guide limit plates 214, stoppers 272, and fixed stoppers 271. When the folding guide is pressed into the carton folding mechanism, the folding is complete.

[0102] It should be noted that this carton folding mechanism features a compact structure, easy adjustment, time-saving and labor-saving features, and strong operational stability. It solves the problem of quickly folding airplane boxes of varying specifications. Furthermore, it can achieve rapid, indentation-free folding of airplane boxes of the same specification with dimensional variations, preventing crushing and damage caused by dimensional deviations.

[0103] Example 2:

[0104] 6 to 9 , this embodiment provides a carton folding mechanism, which is mainly used to fold an airplane box, simplify the folding operation of the airplane box, and improve the folding efficiency of the airplane box. Next, this embodiment is also described using the airplane box as the folding object of the carton folding mechanism.

[0105] Specifically, the carton folding mechanism includes a folding guide base frame 1 and a support structure 2 connected to the folding guide base frame 1. The support structure 2 includes a stopper assembly 27 provided on both sides of the front end of the folding guide base frame 1. The stopper assembly 27 includes a stopper 272. A stopper slide rail 273 is provided between the stopper 272 and the folding guide base frame 1. The stopper 272 can slide on the stopper slide rail 273 and can be selectively fixed in the sliding position.

[0106] In this embodiment, the folding guide bottom frame 1 is a U-shaped frame structure consisting of a pair of horizontal support rails 11 and a pair of longitudinal support rails 12. A foam support bottom plate 5 is provided in the folding guide bottom frame 1 and is nested and fixed with the folding guide bottom frame 1.

[0107] In this embodiment, the stopper rail 273 includes a main stopper rail 2731. A telescopic rail 2732 is disposed within the main stopper rail 2731 and is movably interlocked with the main stopper rail 2731. The stopper 272 is movably interlocked with the telescopic rail 2732 and is also movably connected to the main stopper rail 2731. A support column 274 is disposed between the lower end of the telescopic rail 2732 and the folding guide bottom frame 1.

[0108] Continuing to refer to Figures 6 to 9, the support structure 2 further includes a support device 21, which includes folding guide limit plates 214 disposed on both sides of the rear end of the folding guide base frame 1. Folding guide limit plate mounting sliders 217 are provided between the folding guide limit plates 214 and the folding guide base frame 1 and are movably plugged and fixed to the folding guide base frame 1.

[0109] Furthermore, the support structure 2 also includes a box cover pressing assembly 25 arranged at the rear end of the folding guide limit plate 214, and connecting plates 13 are provided between the box cover pressing assembly 25 and the folding guide bottom frame 1, and between the stop assembly 27 and the folding guide bottom frame 1.

[0110] In this embodiment, the connecting plate 13 is disposed at the intersection of the transverse support rail 11 and the longitudinal support rail 12 and serves to connect the transverse support rail 11 and the longitudinal support rail 12. Specifically, the connecting plate 13 comprises two bottom plates I 131 and two bottom plates II 132, which are slidably assembled with the transverse support rail 11 and the longitudinal support rail 12, respectively. The lid pressing assembly 25 is mounted on the bottom plate I 131, and the stop assembly 27 is disposed on the longitudinal support rail 12.

[0111] Please continue to refer to Figures 6 to 9. Furthermore, the box cover pressing assembly 25 includes a pressure rod 253 whose one end is movably connected to the folding guide bottom frame 1 by a pin shaft, and a support adjustment screw 254 is provided between the rear part of the pressure rod 253 and the bottom plate Ⅰ131, and a buffer rubber cap 256 that is sleeved with the support adjustment screw 254 is provided between the upper end of the support adjustment screw 254 and the pressure rod 253.

[0112] Furthermore, a block limit slider 275 is provided at the rear end of the block 272 and is pressed against the telescopic slide rail 2732. The block limit slider 275, the folding guide limit plate mounting slider 217 and the connecting plate 13 are all provided with a hand-tightened adjustment screw 6 for sliding and tightening the limit.

[0113] In this embodiment, the upper end of the fold guide bottom frame 1 is provided with 14 fold guide wheel members 24 that are screw-type movable plug-in connection and fixed with the fold guide bottom frame 1. The fold guide wheel members 24 are installed on a single side, two opposite sides, three sides or four sides of the fold guide bottom frame 1.

[0114] Please continue to refer to Figures 6 to 9. Specifically, the folding guide wheel member 24 includes a folding guide seat 241. The upper inner side of the folding guide seat 241 is provided with a folding guide arc surface 2410 that is integrated with the folding guide seat 241. The side of the folding guide seat 241 is provided with a bearing roller 242. The outer cylindrical surface of the bearing roller 242 is higher than the folding guide arc surface 2410.

[0115] In summary, this paper box folding mechanism features a compact structure, convenient adjustment, time-saving and labor-saving features, and strong operational stability. It solves the problem of quickly folding airplane boxes of varying specifications. Furthermore, it can achieve rapid, indentation-free folding of airplane boxes of the same specification with dimensional variations, preventing damage caused by dimensional deviations.

[0116] Example 3:

[0117] 10 to 18 , this embodiment provides a carton folding mechanism, which is primarily used to fold an airplane box, simplifying the folding operation and improving the folding efficiency. Next, the carton folding mechanism will be described using the airplane box as the folding object.

[0118] Please refer to Figure 16. In this embodiment, the airplane box is in the shape of a rectangular parallelepiped and is formed by folding a cardboard 3, wherein the cardboard 3 includes: a bottom plate 31, a front support plate 32, a rear support plate 33, a front swing cover 34, a rear swing cover 35, side wings 36, flaps 37, a top cover 38 and a closing cover 39.

[0119] Specifically, the front support plate 32 and the rear support plate 33 are respectively connected to the two long sides of the base plate 31. The front flap 34, the rear flap 35, the side wings 36, and the flap 37 are each provided in pairs, with the two side wings 36 respectively connected to the two short sides of the base plate 31. The two front flaps 34 are respectively connected to the two short sides of the front support plate 32, and the two rear flaps 35 are respectively connected to the two short sides of the rear support plate 33. The other long side of the rear support plate 33 and one long side of the closing cover 39 are respectively connected to the two long sides of the top cover 38. The two flaps 37 are respectively connected to the two short sides of the top cover. Fold lines are provided at the locations where the base plate 31, the front support plate 32, the rear support plate 33, the front flap 34, the rear flap 35, the side wings 36, the flap 37, the top cover 38, and the closing cover 39 connect to each other to facilitate bending during the folding process.

[0120] Please refer to Figures 10 and 11. Furthermore, the paper box folding mechanism includes a folding guide bottom frame 1 and a support structure 2 connected to the folding guide bottom frame 1. The support structure 2 is arranged to form a folding area A. When in use, the cardboard 3 to be folded is placed in the folding area A. With the support and guidance of the support structure 2, the user can fold the cardboard 3 into an airplane box more conveniently and efficiently.

[0121] Specifically, the support structure 2 includes two stopper assemblies 27 and two support devices 21. Each of the two stopper assemblies 27 includes a fixed baffle 271, which is disposed on a first side of the folding guide base frame 1. Each of the two support devices 21 includes a folding guide limiting plate 214, which is disposed on a second side of the folding guide base frame 1. The fixed baffles 271 and the folding guide limiting plate 214 are respectively connected to the folding guide base frame 1, and a quadrilateral folding area A is formed between the two folding guide limiting plates 214 and the two fixed baffles 271.

[0122] It should be noted that when the cardboard 3 to be folded is placed above the folding area A, the side wings 36 of the folded cardboard are located between the fixed baffle 271 and the folding guide limit plate 214. The end surfaces of the two fixed baffles 271 on the side opposite the corresponding support device 21 are respectively provided with guide surfaces 2710. The guide surfaces 2710 are inclined planes or curved surfaces that transition from the upper end to the lower end. This allows the ends of the side wings 36 to move closer to the center of the folding area A as they move along the upper end to the lower end of the guide surfaces 2710. By providing the guide surfaces 2710, the cardboard 3 can be corrected into the folding area A when the bottom plate 31 is pressed downward during folding of the airplane box, preventing damage to the bottom plate 31 caused by the cardboard 3 shifting in the folding area A.

[0123] Please continue to refer to Figures 10 and 11. Furthermore, the folding guide bottom frame 1 is a slide rail bottom frame, and the support structure 2 is slidably connected to the folding guide bottom frame 1. The size of the folding area A can be adjusted by adjusting the size of the quadrilateral area surrounded by the middle of the folding guide bottom frame 1 and the position of the support structure 2 on the folding guide bottom frame 1, thereby realizing auxiliary folding to adapt to various sizes of aircraft boxes.

[0124] Specifically, the folding guide bottom frame 1 includes two mutually parallel transverse support rails 11 and two mutually parallel longitudinal support rails 12. The two transverse support rails 11 and the two longitudinal support rails 12 are respectively located in the upper and lower surfaces and are vertically cross-distributed. A connecting plate 13 is provided at each intersection of the transverse support rails 11 and the longitudinal support rails 12. Each connecting plate 13 at its intersection is slidably connected to the corresponding transverse support rail 11 and longitudinal support rail 12, and the connecting plate 13 can selectively fix its position on the corresponding transverse support rail 11 and longitudinal support rail 12. With such a configuration, the size change of the quadrilateral enclosed by the transverse support rails 11 and the longitudinal support rails 12 can be adjusted by adjusting the positions of the four connecting plates 13 on the corresponding transverse support rails 11 and the longitudinal support rails 12, thereby constructing a two-dimensional sliding platform.

[0125] Continuing with Figures 10 and 11, in this embodiment, two fixed baffles 271 are movably mounted to the two longitudinal support rails 12, respectively. Two folding guide limit plates 214 are movably mounted to the longitudinal support rails 12, distal from the fixed baffles 271, via corresponding connecting plates 13. As the size of the quadrilateral formed by the transverse support rails 11 and the longitudinal support rails 12 changes, the fixed baffles 271 and folding guide limit plates 214 adjust their positions accordingly, adapting to assisting the folding of aircraft boxes of varying sizes.

[0126] Furthermore, the four connecting plates 13 include two bottom plates I 131 and two bottom plates II 132. The two bottom plates I 131 are respectively located below two different longitudinal support rails 12 and above one transverse support rail 11. The two bottom plates II 132 are respectively located below two longitudinal support rails 12 and above another transverse support rail 11. The two folding guide limit plates 214 are respectively fixedly connected to the two bottom plates I 131, thereby achieving movable assembly between the folding guide limit plates 214 and the longitudinal support rails 12.

[0127] Furthermore, the transverse support rails 11 and longitudinal support rails 12 are connected to the bottom plate I 131 and bottom plate II 132, respectively, via bolts. When the bolts are loosened, the bottom plates I 131 and II 132 can move on their corresponding transverse support rails 11 and longitudinal support rails 12. When the bolts are tightened, the positions of the bottom plates I 131 and II 132 relative to the transverse support rails 11 and longitudinal support rails 12 are fixed, forming a stable folding guide bottom frame 1.

[0128] Referring to Figures 12 to 18 , the stopper assembly 27 further includes a stopper rail 273. The stopper rail 273 comprises a telescopic rail 2732. A first slide groove 2732a and a second slide groove 2732b are respectively provided on the bottom and one side surface of the telescopic rail 2732. A stopper main rail 2731 is movably coupled to the telescopic rail 2732. A first bolt 2733 is provided at the bottom of the stopper main rail 2731. When the end of the first bolt 2733 passes through the bottom of the stopper main rail 2731 and abuts against the bottom of the first slide groove 2732a, the stopper main rail 2731 and the telescopic rail 2732 are fixed relative to each other. The opposite sides of the two telescopic slide rails 2732 and the opposite sides of the two block main slide rails 2731 are respectively provided with arc surfaces for supporting and guiding the front swing cover 34. When the block main slide rail 2731 and the telescopic slide rail 2732 are relatively telescoped, they can conveniently adapt to the support and guidance of front swing covers 34 of different sizes.

[0129] Furthermore, a stopper 272 is mounted on the top of the stopper main rail 2731 to limit the position of the cardboard 3 before folding. A second bolt 2721 is provided on the side of the stopper 272. The end of the second bolt 2721 passes through the side of the stopper 272 and abuts against the bottom of the second slide groove 2732b, thereby fixing the stopper 272 and the telescopic rail 2732 relative to each other.

[0130] Continuing with reference to Figures 12 to 18, a third slide groove 2711 is provided on the upper surface of the fixed baffle 271, and a first limiting portion 2731a is provided at the bottom of the stopper main rail 2731. The first limiting portion 2731a is capable of sliding within the third slide groove 2711. When the first limiting portion 2731a moves to the end of the third slide groove 2711 proximate to the guide surface 2710, the end of the stopper main rail 2731 protrudes above the upper end of the guide surface 2710, shortening the distance between the end of the stopper main rail 2731 and the folding area A. This solves the problem of the stopper main rail 2731 having poor support for the front flap 34 of a relatively soft cardboard 3 when the cardboard 3 is folded.

[0131] Furthermore, both longitudinal support rails 12 are movably connected with support columns 274, one end of the support column 274 is slidingly connected to the longitudinal support rail 12, and the other end is connected to the end of the telescopic rail 2732 away from the fixed baffle 271, for supporting the block main rail 2731.

[0132] Furthermore, an additional block 276 is detachably mounted on the stop block 272 . After the additional block 276 is mounted, the height of the stop block 272 can be increased, so that the stop block 272 can be folded to accommodate airplane boxes of different sizes.

[0133] Furthermore, a limiting groove 2720 and a first connection hole 2722 are provided on the upper surface of the stopper 272, and a second limiting portion 2761 is provided on the lower surface of the additional block 276 corresponding to the limiting groove 2720. A second connection hole 2760 is provided on the additional block 276 at a position corresponding to the first connection hole 2722, extending from top to bottom. When the additional block 276 is connected to the stopper 272, the second limiting portion 2761 is installed in the limiting groove 2720, and screws or pins are provided in the first connection hole 2722 and the second connection hole 2760, thereby achieving a limited installation of the additional block 276 on the stopper 272.

[0134] In this embodiment, a folding guide wheel member 24 is provided on both the transverse supporting slide rail 11 and the longitudinal supporting slide rail 12. For the convenience of description, the folding guide wheel member 24 located between the two fixed baffles 271 is defined as the first folding guide wheel member 24a; the folding guide wheel member 24 located between the two folding guide limit plates 214 is defined as the second folding guide wheel member 24b; and the folding guide wheel member 24 located between the fixed baffles 271 and the folding guide limit plates 214 on the two longitudinal supporting slide rails 12 is defined as the third folding guide wheel member 24c.

[0135] Furthermore, the first and second folding guide wheels 24a, 24b respectively support and guide the front support plate 32 and rear support plate 33 of the cardboard 3. At least one third folding guide wheel 24c is movably connected to each of the two longitudinal support rails 12 within the folding area A to support and guide the side wings 26. When folding larger boxes, the number of first, second, and third folding guide wheels 24a, 24b, 24c can be increased to improve support effectiveness.

[0136] 12 to 18 , the guide wheel member 24 further includes a folding guide seat 241 , and a folding guide arc surface 2410 is provided on the upper end of the folding guide seat 241. In other embodiments, the folding guide arc surface 2410 may also be an inclined plane.

[0137] It should be noted that the angle between the curved folding guide surface 2410 on the first folding guide wheel 24a and the horizontal plane is smaller than the angle between the curved folding guide surface 2410 on the second folding guide wheel 24b and the horizontal plane. When the paperboard 3 is placed in the folding area A, the curved folding guide surface 2410 on the first folding guide wheel 24a can better support the front support plate 32 and reduce the pressure between the curved folding guide surface 2410 and the front support plate 32.

[0138] Furthermore, the folding guide wheel member 24 further includes a bearing roller 242 arranged on a side of the folding guide seat 241 close to the folding area A, for improving the guiding ability of the folding guide seat 241 on the paperboard 3.

[0139] In this embodiment, the stopper main slide rail 2731 and the folding guide limiting plate 214 are all higher than the folding guide wheel member 24. When the cardboard 3 is pressed down, the front swing cover 34 and the rear swing cover 35 are folded before the side wings 36.

[0140] In this embodiment, the first folding guide wheel 24a and the second folding guide wheel 24b are both higher than the third folding guide wheel 24c. In the first stage of the folding process, the rear support plate 33 and the front support plate 32 are bent before the side wings 36 under the support of the first folding guide wheel 24a and the second folding guide wheel 24b.

[0141] Furthermore, the bearing roller 242 on the first folding guide wheel 24a is defined as a first roller 242a. The bearing roller 242 on the second folding guide wheel 24b is defined as a second roller 242b. The bearing roller 242 on the third folding guide wheel 24c is defined as a third roller 242c. The third roller 242c contacts the carton before the first roller 242a. When the bottom plate 31 is further pressed downward, the side wings 36 are folded into place before the front support plate 32.

[0142] Furthermore, the first, second, and third rollers 242a, 242b, and 242c have the same diameter, and the axes of the first, third, and second rollers 242a, 242c, and 242b are installed at increasing heights. When the base plate 31 is further pressed downward, because the third roller 242c is higher than the first roller 242a, the side wings 36 fold into place before the front support plate 32. This reduces the interference between the ends of the front flap 34 and the side wings 36 during folding, making the folding process smoother. Furthermore, because the second roller 242b is higher than the third roller 242c, the rear support plate 33, side wings 36, and front support plate 32 are folded in different orders during folding. This allows the rear support plate 33, side wings 36, and front support plate 32 to apply force to the base plate 31 in stages, resulting in a smoother folding process and higher efficiency compared to simultaneous folding.

[0143] Furthermore, the axes of the first roller 242a, the third roller 242c and the second roller 242b are installed at the same height and their diameters increase sequentially, which can also achieve different folding sequences of the above-mentioned rear support plate 33, side wings 36 and front support plate 32.

[0144] Continuing to refer to Figures 12 to 18, when folding a carton, the cardboard 3 is placed on the carton folding mechanism, the bottom plate 31 is located above the folding area A, the front support plate 32 and the rear support plate 33 respectively abut against the folding guide arc surface 2410 on the first folding guide wheel 24a and the folding guide arc surface 2410 on the second folding guide wheel 24b, the rear swing cover 35 respectively abuts against the two folding guide limit plates 214, the front swing cover 34 respectively abuts against the two block main slide rails 2731, and the side wings 36 respectively abut against the corresponding third folding guide wheel 24c, and the ends of the two side wings 36 close to the front swing cover 34 abut against the guide surface 2710. Specifically, the portion of the side wings 36 located between the bottom plate 31 and the side wing fold line 361 abuts against the third folding guide wheel 24c.

[0145] During folding, a preliminary downward pressure is first applied, causing the ends of the two side flaps 36 near the front flap 34 to move downward along the guide surface 2710, thereby correcting the position of the paperboard 3 and facilitating further folding operations. Because the stopper main slide rail 2731 and the folding guide limit plate 214 are both higher than the folding guide wheel 24, the front flap 34 and the rear flap 35 are bent before the front support plate 32 and the rear support plate 33, respectively, when the paperboard 3 is placed on the carton folding mechanism. Further downward pressure is then applied. Because the first and second folding guide wheels 24a and 24b are both higher than the third folding guide wheel 24c, the front support plate 32 and the rear support plate 33 are bent before the side flaps 36, positioning the front flaps 34 and the rear flap 35 between the two side flaps 36. Further downward pressure is then applied. Because the third roller 242c is higher than the first roller 242a, the side flaps 36 fold into place before the front support plate 32 during further downward pressure. After the base plate 31 is pressed downward into place, the front and rear support plates 32 and 33 are bent perpendicular to the base plate 31. The front and rear flaps 34 and 35 are perpendicular to the front and rear support plates 32, 33, and base plate 31, respectively. The side wings 36 are perpendicular to the base plate 31 and enclose the front and rear flaps 34 and 35, respectively. The side wings 36 are then folded along the fold lines 361, and the snap-fit ​​keys 362 are inserted into the snap-fit ​​slots 363, securing the front and rear flaps 34 and 35 within their corresponding side wings 36. At this point, the folding of the airplane box, excluding the top cover 38 and the closing cover 39, is complete.

[0146] Furthermore, a box cover pressing assembly 25 is provided on the transverse support rail 11 near the side of the folding guide limit plate 214. Specifically, the box cover pressing assembly 25 includes an ear plate seat 251, and the ear plate seat 251 and the bottom plate I131 are slidably connected to the transverse support rail 11 by bolts. The side of the ear plate seat 251 near the folding area A is also provided with an arc surface that serves as a guide and support, and a second roller 242b is also installed on this side. It should be noted that the axis installation height of the second roller 242b on the ear plate seat 251 is the same as the axis installation height of the second roller 242b on the second folding guide wheel member 24b, which is used to further enhance the guiding and supporting effect on the rear support plate 33.

[0147] Furthermore, the end of the ear plate seat 251 away from the transverse support slide 11 is movably connected to a pressure rod 253. Support adjustment screws 254 are respectively provided on the two bottom plates I131, and the end of the support adjustment screw 254 away from the bottom plate I131 abuts against the pressure rod 253. The end of the support adjustment screw 254 away from the bottom plate I131 can be adjusted upward or downward relative to the bottom plate I131, thereby adjusting the angle between the pressure rod 253 and the ear plate seat 251. When the cardboard 3 is placed on the carton folding mechanism, its top cover 38 abuts against the pressure rod 253. When the ear plate seat 251 adjusts its position relative to the transverse support slide 11 along with the corresponding bottom plate I131, the pressure rod 253 supports top covers 38 of different sizes.

[0148] Furthermore, the pressure rod 253 is hingedly connected to the lug seat 251 via a rotating assembly 252. An open-ended clearance slot 2521 is provided at one end of the rotating assembly 252. The hinged end of the lug seat 251 is positioned within the clearance slot 2521 and hingedly connected to the rotating assembly 252. The other end of the rotating assembly 252 is fixedly connected to the pressure rod 253. The provision of the rotating assembly 252 aligns the centerlines of the pressure rod 253 and the lug seat 251, facilitating folding and storage of the pressure rod 253 into the folding area A while preventing collision with other supporting components.

[0149] Furthermore, a stop block 255 is slidably connected to the pressure rod 253 and is fixed to the pressure rod 253 via a bolt. During use, the bolt can be loosened to adjust the position of the stop block 255, and then tightened to secure the stop block 255 to the pressure rod 253, to accommodate the positional stops of the top cover 38 of cartons of different sizes. After the stop block 255 is set, the end of the closing plate 39 of the cardboard to be folded abuts the stop block 255, allowing the cardboard 3 to be confined within the support structure 2 during initial positioning. This prevents some relatively stiff cardboards 3 from springing outward due to their own elasticity during initial downward positioning, facilitates initial cardboard positioning, and improves the efficiency of folding the airplane box.

[0150] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0151] 1. A guide surface 2710 is provided on one side of the fixed baffle 271 close to the inner side of the folding area A. When the cardboard 3 is initially pressed down, the position of the cardboard 3 can be corrected into the folding area A to prevent the bottom plate 31 from being damaged due to the position deviation of the cardboard 3.

[0152] 2. Stopper The main slide rail 2731 is provided with a curved surface on one side close to the inside of the folding area A for supporting and guiding the front swing cover 34 .

[0153] 3. A third slide groove 2711 is provided on the fixed baffle 271, and a first limiting portion 2731a is provided at the bottom of the block main slide rail 2731. The first limiting portion 2731a is in the third slide groove 2711. The first limiting portion 2731a slides in the third slide groove 2711 to realize the limiting movable connection between the block main slide rail 2731 and the fixed baffle 271.

[0154] 4. The folding guide bottom frame 1 is provided with at least one first folding guide wheel member 24a and a second folding guide wheel member 24b on two opposite side edges for supporting and guiding the front support plate 32 and the rear support plate 33, and at least one third folding guide wheel member 24c is provided on the other two opposite side edges for supporting and guiding the side wings 36 of the aircraft box. The first folding guide wheel member 24a and the second folding guide wheel member 24b are both higher than the third folding guide wheel member 24c. During the folding process, the front support plate 32 and the rear support plate 33 are bent before the two side wings 36 under the support of the first folding guide wheel member 24a and the second folding guide wheel member 24b, respectively.

[0155] 5. A first roller 242a and a third roller 242c are respectively provided on the side of the first folding guide wheel member 24a and the third folding guide wheel member 24c near the folding area A, which are used to improve the guiding ability of the folding guide wheel member 24 on the cardboard 3. The installation height of the axis of the first roller 242a is lower than the installation height of the axis of the third roller 242c. When the bottom plate 31 is further pressed downward, the side wings 36 will fold into place before the front support plate 32, reducing the interference between the end of the front swing cover 34 and the plate surface of the side wings 36 during the folding process, making the folding process smoother.

[0156] 6. At least one ear plate seat 251 is provided on the folding guide bottom frame 1 between the two folding guide limit plates 214. A pressure rod 253 is hinged on the ear plate seat 251, and a stop block 255 is movably connected to the pressure rod 253. This can prevent some relatively hard cardboards 3 from popping outward due to the elasticity of the cardboards 3 when they are initially pressed down for positioning, thereby facilitating the initial positioning of the cardboards 3 and improving the efficiency of carton folding.

[0157] 7. The folding guide bottom frame 1 is a two-dimensional slide rail frame, which can achieve size changes in the folding area A by adjusting the position of the connecting plate 13 on the corresponding transverse support rail and longitudinal support rail, so as to facilitate the auxiliary folding of cartons of different sizes.

[0158] Compared with the prior art, the carton folding mechanism of this embodiment has a position correction function and a limit function, which makes the folding process smoother, reduces the carton damage rate, and improves the carton folding efficiency.

[0159] Example 4:

[0160] Referring to Figures 19 to 37, this embodiment provides a carton folding mechanism, which is mainly used to fold an airplane box, simplify the folding operation of the airplane box, and improve the folding efficiency of the airplane box. Next, this embodiment describes the airplane box as the folding object of the carton folding mechanism.

[0161] Referring to Figures 19 to 25 , the carton folding mechanism further comprises a folding guide base frame 1 and a support structure 2. The support structure 2 is connected to the folding guide base frame 1, with the supporting side of the support structure 2 extending away from the folding guide base frame 1. It should be noted that the folding guide base frame 1 and the support structure 2 enclose a folding area A. To fold the carton, simply place the carton on the support structure 2 and press it into the folding area A. The support structure 2 provides support and guidance to complete the folding operation.

[0162] Please refer to Figure 19. In this embodiment, the airplane box is in the shape of a rectangular parallelepiped and is formed by folding a cardboard 3, wherein the cardboard 3 includes: a bottom plate 31, a front support plate 32, a rear support plate 33, a front swing cover 34, a rear swing cover 35, side wings 36, flaps 37, a top cover 38 and a closing cover 39.

[0163] Specifically, the front support plate 32 and the rear support plate 33 are respectively connected to the two long sides of the base plate 31. The front flap 34, the rear flap 35, the side wings 36, and the flap 37 are each provided in pairs, with the two side wings 36 respectively connected to the two short sides of the base plate 31. The two front flaps 34 are respectively connected to the two short sides of the front support plate 32, and the two rear flaps 35 are respectively connected to the two short sides of the rear support plate 33. The other long side of the rear support plate 33 and one long side of the closing cover 39 are respectively connected to the two long sides of the top cover 38. The two flaps 37 are respectively connected to the two short sides of the top cover. Fold lines are provided at the locations where the base plate 31, the front support plate 32, the rear support plate 33, the front flap 34, the rear flap 35, the side wings 36, the flap 37, the top cover 38, and the closing cover 39 connect to each other to facilitate bending during the folding process.

[0164] Please continue to refer to Figures 19 to 25. Furthermore, the folding guide bottom frame 1 includes: a transverse support rail 11, a longitudinal support rail 12 and a connecting plate 13. Among them, two transverse support rails 11 are provided and are parallel to each other, and two longitudinal support rails 12 are also provided and are parallel to each other. The two transverse support rails 11 and the two longitudinal support rails 12 are respectively located in two parallel planes. The two transverse support rails 11 and the two longitudinal support rails 12 intersect with each other to form a plurality of intersections, and each intersection is provided with a connecting plate 13. Each connecting plate 13 is located between the transverse support rail 11 and the longitudinal support rail 12. Each connecting plate 13 is slidably connected to the transverse support rail 11 and the longitudinal support rail 12, and each connecting plate 13 can selectively fix its position on the transverse support rail 11 and the longitudinal support rail 12.

[0165] It should be noted that the connecting plate 13 is slidably connected to the transverse support slide 11 and the longitudinal support slide 12, so that the paper box folding mechanism can adjust the size of the quadrilateral formed between the transverse support slide 11 and the longitudinal support slide 12 by adjusting the corresponding positions of the connecting plate 13 on the transverse support slide 11 and the longitudinal support slide 12, thereby adjusting the folding area A, so that the paper box folding mechanism can assist in folding paper boxes of different sizes, thereby improving the adaptability of the paper box folding mechanism.

[0166] Furthermore, the connecting plate 13 includes: a bottom plate I 131 and a bottom plate II 132, and the bottom plates I 131 and II 132 are arranged opposite each other. In this embodiment, there are four connecting plates 13 provided at the intersection, and four connecting plates 13 are provided correspondingly. Two of the connecting plates are bottom plates I 131 and two are bottom plates II 132.

[0167] Please refer to Figures 20, 26, and 27. Furthermore, the two transverse support rails 11 and the two longitudinal support rails 12 are all made of aluminum profiles, and both are provided with guide grooves. Two mutually parallel first ridges 1311 are protruding from the end surfaces of the two base plates I 131 near the transverse support rail 11. A first guide channel is defined between the two mutually parallel first ridges 1311. A portion of the transverse support rail 11 is slidably mounted within the first guide channel and can be fixed in position after sliding by the support structure 2. Two mutually parallel second ridges 1312 are protruding from the end surfaces of the two base plates I 131 near the longitudinal support rail 12. A second guide channel is defined between the two mutually parallel second ridges 1312. A portion of the longitudinal support rail 12 is slidably mounted within the second guide channel and can be fixed in position after sliding by fastening screws.

[0168] Please refer to Figures 20, 28, and 29. Similarly, two third parallel ridges 1321 are protruding from the end surfaces of the two base plates II 132 near the side of the transverse support rail 11. The two third parallel ridges 1321 define a third guide channel. The other portion of the transverse support rail 11 is slidably mounted within the third guide channel and can be fixed in position after sliding by the support structure 2. Two fourth parallel ridges 1322 are protruding from the end surfaces of the two base plates II 132 near the side of the longitudinal support rail 12. The two fourth parallel ridges 1322 define a fourth guide channel. The other portion of the longitudinal support rail 12 is slidably mounted within the fourth guide channel and can be fixed in position after sliding by tightening screws.

[0169] In this embodiment, the two bottom plates I 131 are located below the same transverse support rail 11 and above two different longitudinal support rails 12. The two bottom plates II 132 are similarly located below another transverse support rail 11 and above two different longitudinal support rails 12. In other embodiments, the positions of the transverse support rails 11 and longitudinal support rails 12 can be interchanged, while the placement and installation of the other structures remain unchanged.

[0170] Please refer to Figures 19, 20 and 23. Furthermore, the support structure 2 includes a support device 21, a fixed part of the support device 21 is fixedly connected to the folding guide bottom frame 1, and the support part of the support device 21 can be rotated relative to the folding guide bottom frame 1 so as to be turned outward when the aircraft box is folded into shape.

[0171] It should be noted that in the related art, the support device 21 is fixedly assembled with the folding guide bottom frame 1. During the process of folding the cardboard 3 into the airplane box, the bottom plate 31 is pressed down to move the cardboard 3 into the folding area A. At this time, under the support of the support device 21, the rear swing cover 35 is assisted in folding. In order to reduce the gap at the corner a of the folded airplane box and prevent the rear cover 35 from being higher than the fold line position of the side wings 36 due to the tilting of the end portion, the supporting portion of the supporting device 21 (i.e., the folding guide limit plate 214 hereinafter) will be thinned; and the supporting portion of the thinned supporting device 21 is very easy to be inserted into the gap between the rear cover 35 and the side wings 36, resulting in the airplane box being unable to be pressed down (as shown in Figure 22), and the folding operation of the airplane box cannot be completed; at the same time, the supporting portion of the fixed supporting device 21 will also hinder the folding of the flaps 37, resulting in the flaps 37, the top cover 38 and the closing plate 39 being unable to be further folded. If further folding is required, the airplane box needs to be taken out and folded; at this time, during the process of taking out the airplane box, the supporting portion will also abut against the flaps 37, thereby hindering the taking out operation of the airplane box and causing difficulty in taking out. In addition, the outer wall of the airplane box is also easily scratched by the supporting portion during the taking out process, causing the outer wall of the airplane box to be scratched. It can be seen that fixing the support device 21 to the folding guide bottom frame 1 is not conducive to the folding and forming of the aircraft box. It should be noted that the dotted line in the figure represents the folding line of the cardboard 3.

[0172] Referring to Figure 23, in this embodiment, the support portion of the support device 21 is configured to be rotatable relative to the folding guide base frame 1. During the downward pressing process of the cardboard 3, the support portion of the support device 21 can be turned outward after assisting the flap 35 in folding, so that the support end of the support portion is turned to a position away from the folding area A. This configuration of the support device 21, on the one hand, can thicken the support portion, thereby reducing the possibility of insertion into the gap between the rear flap 35 and the side wings 36, ensuring that the aircraft box can be smoothly pressed down and folded; on the other hand, it can facilitate the folding of the rear flap 35, side wings 36, and rear support plate 33 into place, thereby improving the quality of the aircraft box after formation. In addition, after the support portion is turned outward, the flap 37, top cover 38, and closing cover plate 39 can be directly folded together in the folding mechanism of the aircraft box. During the folding process, the product to be packaged can be directly placed in the aircraft box and then folded, thereby completing the product boxing operation directly, effectively improving the folding efficiency of the aircraft box. At the same time, the outward turning of the support portion can also reduce obstacles and difficulties when removing the aircraft box, thereby facilitating the removal of the folded aircraft box.

[0173] 24 and 30 to 33 , the support device 21 is fixedly mounted on the bottom plate I 131 and can move synchronously with the bottom plate I 131 . Specifically, the support device 21 includes a power source 211 , a mounting base 212 , a transmission assembly 213 , and a folding guide limit plate 214 .

[0174] Among them, the power source 211 includes a main body 2111 and a power output part 2112 connected to the main body 2111. The main body 2111 is fixedly assembled with the base plate I131 by fastening screws. The mounting seat 212 is arranged on the side of the power output part 2112 away from the main body 2111, and is fixedly assembled with the base plate I131 by fastening screws. The transmission assembly 213 is rotatably assembled on the mounting seat 212. The end of the transmission assembly 213 close to the main body 2111 is fixedly connected to the power output part 2112 and can move synchronously with the power output part 2112. The folding guide limit plate 214 is arranged on the side of the mounting seat 212 away from the power source 211. The folding guide limit plate 214 is fixedly connected to the end of the transmission assembly 213 away from the power source 211, and can move synchronously with the transmission assembly 213.

[0175] It should be noted that the power source 211 provides power to the transmission assembly 213, causing the transmission assembly 213 to move synchronously with the power output part 2112, thereby driving the folding guide limit plate 214 fixedly installed on the transmission assembly 213 to rotate, thereby realizing the outward turning of the folding guide limit plate 214.

[0176] Continuing to refer to Figures 24, 30, and 33, mounting base 212 is L-shaped overall, and the bottom of mounting base 212 is fixed to base plate I 131 via screws. Mounting base 212 is located between power source 211 and folding guide limit plate 214, providing support for transmission assembly 213, ensuring stable transmission.

[0177] A first limiting strip 2121 is protruding from the bottom of the mounting base 212, and a first limiting groove 1310 is provided on the bottom plate I 131 at a position corresponding to the first limiting strip 2121. When assembling the mounting base 212 and the bottom plate I 131, the first limiting strip 2121 is first aligned with the first limiting groove 1310, and then the mounting base 212 is fixed to the bottom plate I 131 with a single fastening screw. This arrangement not only reduces the number of fastening screws used, but also only requires one fastening screw to achieve fixed assembly between the mounting base 212 and the bottom plate I 131, thereby improving the efficiency of assembly and disassembly of the support device 21.

[0178] Please continue to refer to Figures 24, 30 to 33. Further, the transmission assembly 213 includes: a transmission shaft 2131, a connecting member 2132, and a fixing member 2133. Specifically, a through-hole is provided on the mounting base 212, and the transmission shaft 2131 is movably inserted through the through-hole. One end of the connecting member 2132 is fixedly connected to the power output portion 2112, and the other end is fixedly connected to the end of the transmission shaft 2131 near the power source 211, so that the transmission shaft 2131 can move synchronously with the power output portion 2112. The fixing member 2133 is sleeved on the end of the transmission shaft 2131 away from the connecting member 2132 and is fixedly connected to the transmission shaft 2131. The transmission shaft 2131 is fixedly connected to the folding guide limit plate 214 through the fixing member 2133, so that the folding guide limit plate 214 can rotate synchronously with the transmission shaft 2131, thereby driving the folding guide limit plate 214 to evert.

[0179] Furthermore, the fixed portion includes the main body 2111 of the power source 211 and the mounting base 212; the supporting portion includes the folding guide limit plate 214. The power source 211 is a stepper motor. The rotation of the stepper motor drives the transmission shaft 2131, which causes the folding guide limit plate 214 to rotate outward or return to its original position. A bearing is provided in the through-hole, through which the transmission shaft 2131 is rotatably assembled with the mounting base 212.

[0180] Furthermore, the folding guide limiting plate 214 includes a mounting portion 2141, located on the side of the folding guide limiting plate 214 near the bottom plate I 131. Mounting portion 2141 is provided with a mounting hole 2140. A portion of a fixing member 2133 extends through mounting hole 2140, while the remaining portion is fixedly connected to mounting portion 2141 via four fastening screws. A sidewall of mounting portion 2141 is provided with a clearance opening 2142, through which the fastening screws are assembled with fixing member 2133, thereby securely connecting fixing member 2133 to transmission shaft 2131.

[0181] Returning to Figures 19 to 25 , support device 21 further includes a sensor 215 and a control box 216. Specifically, sensor 215 is mounted on the folding guide base frame 1 and electrically connected to control box 216 via wire 4. Control box 216 is connected to power source 211 via wire 4. Control box 216 can provide power to power source 211 and also control power source 211 based on the detection results of sensor 215.

[0182] It should be noted that during the downward pressure of the cardboard 3, when the sensor 215 detects the presence of a cardboard 3 or an airplane box within the folding area A, the control box 216 controls the power source 211 to drive the folding guide limit plate 214 outward. Otherwise, the control box 216 controls the power source 211 to drive the first support rod 214 back to its original position. In this embodiment, the sensor 215 is a photoelectric sensor, and the control box 216 is conventional technology and will not be described in detail in this embodiment.

[0183] Please refer to Figures 19 to 25 and Figures 30 to 33. Furthermore, the support structure 2 also includes a first support assembly 22 fixedly assembled with the folding guide bottom frame 1. The first support assembly 22 is arranged on the side of the folding guide limit plate 214 away from the power source 211. The first support assembly 22 includes a first support seat 221, and the end of the transmission shaft 2131 away from the power source 211 passes through the folding guide limit plate 214 and is rotatably assembled with the side of the first support seat 221 close to the folding guide limit plate 214. Obviously, the transmission shaft 2131 is rotatably assembled with the mounting seat 212 and the first support seat 221 respectively, which can effectively improve the stability of the transmission process of the transmission shaft 2131 and enable the folding guide limit plate 214 to be stably turned outward and reset. In this embodiment, a bearing is provided between the transmission shaft 2131 and the first support seat 221 to improve the smoothness of the rotation of the transmission shaft 2131.

[0184] Furthermore, a second limiting groove 2210 is provided at the bottom of the first support base 221, and a second limiting bar 1313 is protruding from the bottom plate I 131 to match the second limiting groove 2210. When assembling the first support base 221 and the bottom plate I 131, the second limiting bar 1313 is first matched with the second limiting groove 2210, and then the first support base 221 is fixed to the bottom plate I 131 with a fastening screw. This arrangement not only reduces the number of fastening screws, but also only requires one fastening screw to achieve fixed assembly between the first support base 221 and the bottom plate I 131, thereby improving the efficiency of assembly and disassembly of the first support assembly 22.

[0185] It should be noted that two support devices 21 are provided, as are two first support assemblies 22, corresponding to the support devices 21. The supporting ends of the first support bases 221 are provided with support surfaces that are inclined outward from the folding area A. This not only protects the outer wall of the cardboard 3 but also facilitates folding of the cardboard 3. Furthermore, rollers are provided on the first support assemblies 22 to convert sliding friction between the first support assemblies 22 and the cardboard 3 into rolling friction, protecting the outer wall of the cardboard 3 while enhancing the smoothness of the folding process.

[0186] Please refer to Figures 20 and 34 to 37. Furthermore, the support structure 2 also includes a second support assembly 23 installed on the base plate II 132. The second support assembly 23 includes: a second support seat 231, a rotating pressing member 232 and a rotating connecting member 233.

[0187] Specifically, the second support base 231 is fixedly connected to the base plate II 132. The rotating pressing member 232 is mounted on the second support base 231 and is rotatable relative to the second support base 231. The rotating connecting member 233 has a first end and a second end. The first end is connected to the second support base 231, and the second end is connected to the rotating pressing member 232. The rotating connecting member 233 is used to achieve a rotating assembly between the rotating pressing member 232 and the second support base 231.

[0188] During the folding process of the airplane box, when the cardboard 3 is pressed toward the side of the lateral support rail 11 or the longitudinal support rail 12, the cardboard 3 can drive the rotating pressing member 232 to rotate relative to the second support seat 231, causing the rotating pressing member 232 to abut against the outer wall of the portion of the cardboard 3 to be folded, and pushing the portion of the cardboard 3 to be folded toward the side near the bottom plate 1131, so that the portion of the cardboard 3 to be folded is folded into place. It should be noted that in this embodiment, the second support assembly 23 is used to support and fold the front support plate 32, that is, the portion to be folded pressed by the rotating pressing member 232 is the front support plate 32 of the cardboard. Before the airplane box is folded, the rotating pressing member 232 partially protrudes from the second support seat 231 so that it contacts the front support plate 32 during the downward pressure process, thereby driving the rotating pressing member 232 to rotate, pushing the front support plate 32 toward the side wings 36 and flattening it, that is, folding the front support plate 32 into place.

[0189] Please continue to refer to Figures 20, 34 to 37. Furthermore, the second support assembly 23 also includes a rolling member 234 provided on the second support seat 231. Specifically, the rolling member 234 partially protrudes from the end face of the second support seat 231 on the side close to the folding area A, and the rolling member 234 can roll relative to the second support seat 231, thereby converting the sliding friction between the aircraft box and the second support seat 231 during the folding process into rolling friction. Obviously, the provision of the rolling member 234 can, on the one hand, prevent the outer wall of the cardboard 3 from being scratched by the second support seat 231 during the downward pressing process, thereby ensuring the aesthetics of the aircraft box after folding; on the other hand, it can reduce the resistance of the cardboard 3 to the downward pressing, making the folding of the aircraft box smoother. It should be noted that in this embodiment, the rolling member 234 is a roller rotatably assembled on the second support seat 231.

[0190] The end of the second support seat 231 away from the bottom plate II 132 is provided with a support surface inclined toward the outside of the folding area A, so that the cardboard 3 can enter the folding area A more easily during the downward pressing process, and the setting of the support surface can better guide the cardboard 3 into the folding area A; in addition, the support surface can effectively avoid the situation where the outer wall of the cardboard 3 is damaged due to the end of the second support seat 231 directly abutting the outer wall of the cardboard 3, thereby further ensuring the beauty of the aircraft box after folding.

[0191] Furthermore, a third limiting groove 2310 is provided at the bottom of the second support base 231, and a third limiting bar 1323 is provided protruding from the bottom plate II 132 to fit with the third limiting groove 2310. When assembling the second support base 231 and the bottom plate II 132, the third limiting bar 1323 is first fitted with the third limiting groove 2310, and then the second support base 231 is fixed to the transverse support rail 11 with a single fastening screw. This arrangement not only reduces the number of fastening screws used, but also only requires one fastening screw to achieve fixed assembly between the second support base 231 and the bottom plate II 132, thereby improving the efficiency of assembly and disassembly of the second support assembly 23.

[0192] Furthermore, the rotating pressing member 232 is used to push the front support plate 32 toward the inner side of the folding area A and flatten it. The rotating pressing assembly 232 includes: a driving part 2321 , a pressing part 2322 and a counterweight part 2323 .

[0193] Specifically, in its natural state, the driving portion 2321 protrudes from the end surface of the second support seat 231 near the bottom plate I131, allowing the cardboard 3 to press against the driving portion 2321 during downward pressure, thereby causing the driving portion 2321 to rotate relative to the second support seat 231. The pressing portion 2322 is connected to the driving portion 2321. The pressing portion 2322 has a flattening end surface 2320. Driven by the driving portion 2321, the pressing portion 2322 rotates, causing the flattening end surface 2320 to abut against the front support plate 32, and pushing the front support plate 32 toward the bottom plate I131, causing the front support plate 32 to close with the side wings 36 after folding. The counterweight portion 2323 is connected to the side of the pressing portion 2322 away from the driving portion 2321. After the aircraft box is folded and taken out, the counterweight portion 2323 resets the rotating pressing member 232 by its own gravity, so as to assist the front support plate 32 to fold into place when the next aircraft box is folded.

[0194] It should be noted that the rotating pressing member 232 can be switched between a natural state and a flattened state by rotating. In the natural state, the counterweight portion 2323 abuts against the transverse support rail 11, and the driving portion 2321 partially protrudes from the second support seat 231. In the flattened state, the driving portion 2321 abuts against the bottom plate II 132, and the flattened end surface 2320 is substantially vertical and abuts against the outer wall of the cardboard 3.

[0195] It should also be noted that when the rotating pressing member 232 is in its natural state, the counterweight portion 2323 is acted upon by gravity, causing the driving portion 2321 to partially protrude from the second support seat 231 inside the first folding area A. This allows the cardboard 3 to abut against the driving portion 2321 during the folding process, causing the driving portion 2321 to rotate, thereby driving the pressing portion 2322 and the counterweight portion 2323 to rotate synchronously. During the rotation of the rotating pressing member 232, the flattened end surface 2320 gradually comes into contact with the outer wall of the front support plate 32, gradually pushing the front support plate 32 inward of the folding area A, so that the front support plate 32 remains in a substantially vertical position after the aircraft box is folded, facilitating the flipping and folding of the side wings 36.

[0196] Please go back to Figures 19 to 25 again. Furthermore, the support structure 2 also includes: a folding guide wheel component 24, a box cover pressing component 25 and a third support component 26.

[0197] Specifically, multiple folding guide wheel assemblies 24 are provided, each slidably mounted on the transverse support rail 11 and the longitudinal support rail 12. Each folding guide wheel assemblies 24 can be selectively fixed to a corresponding transverse support rail 11 or longitudinal support rail 12. The lid pressing assembly 25 is fixedly mounted on the bottom plate I 131 and is capable of synchronous movement therewith. The third support assembly 26 is fixedly mounted on the bottom plate II 132 and is capable of synchronous movement therewith.

[0198] In this embodiment, four folding guide wheel components 24 are provided. One folding guide wheel component 24 is located midway between the two bottom plates I 131; one folding guide wheel component 24 is located midway between the two bottom plates II 132; and two folding guide wheel components 24 are located midway between bottom plates I 131 and II 132. Obviously, the user can adjust the specific location and number of folding guide wheel components 24 as needed. The folding guide wheel components 24 include a third support base 241, which is connected to the transverse support rail 11 or the longitudinal support rail 12 via bolts. Tightening or loosening the bolts allows for fixed or sliding movement, thereby enabling position adjustment.

[0199] Please continue to refer to Figures 19 to 25. Further, the box cover pressing assembly 25 includes: an ear plate seat 251, a rotating assembly part 252, a pressing rod 253, a supporting and adjusting screw 254 and a stop block 255.

[0200] Specifically, the ear plate seat 251 is fixedly mounted on the base plate I 131 via fastening screws. One end of the rotating assembly 252 is rotatably assembled with the end of the ear plate seat 251 away from the base plate I 131, and the other end is fixedly assembled with the pressure rod 253. One end of the support adjustment screw 254 is fixedly assembled with the base plate I 131, and the other end abuts the end of the pressure rod 253 near the rotating assembly 252, supporting the pressure rod 253 so that the pressure rod 253 extends upward at an angle, thereby supporting the flap 37, the top cover 38, and the closing cover 39. The stop block 255 is slidably mounted on the pressure rod 253 and can be selectively fixed in its sliding position. The stop block 255 is used to limit the position of the cardboard 3, so that the base plate 31 of the cardboard 3 is positioned directly above the folding area A when the aircraft box is folded, facilitating the folding of the cardboard 3. In this embodiment, two box cover pressing assemblies 25 are provided, and they are parallel to each other.

[0201] In one embodiment, the third support assembly 26 includes a third support base 261, which is fixedly mounted on the bottom plate II 132 by fastening screws. In this embodiment, two third support assemblies 26 are provided, and are fixedly mounted on two bottom plates II 132 respectively.

[0202] Continuing with Figures 1 to 7 , in one embodiment, a stop assembly 27 is fixedly mounted on the bottom plate II 132. A stop block 272 is slidably mounted on the side of the stop assembly 27 away from the bottom plate II 132. This block 272 cooperates with the stop block 255 to position the bottom plate 31 of the cardboard 3 directly above the folding area A when the airplane box is folded, facilitating folding of the cardboard 3.

[0203] From the above description, it can be seen that the embodiments of the present application achieve the following technical effects:

[0204] 1. The support portion of the support device 21 is configured to be rotatable relative to the folding guide bottom frame 1. During the downward pressing process of the cardboard 3, the support portion of the support device 21 assists the rear flap 35 in folding and then turning outward, so that the support end of the support portion turns to a position away from the folding area A. The support device 21 configured in this way can, on the one hand, thicken the support portion, thereby reducing the possibility of insertion into the gap between the rear flap 35 and the side wings 36, ensuring that the aircraft box can be smoothly pressed down and folded; on the other hand, it can facilitate the folding of the rear flap 35, side wings 36 and rear support plate 33 into place, thereby improving the quality of the aircraft box after molding; in addition, after the support portion is turned outward, the aircraft box can directly fold the flaps 37, top cover 38 and closing cover plate 39 together in the folding mechanism, and the product to be packaged can be directly placed in the aircraft box during the folding process and then folded, so that the product boxing operation can be directly completed, effectively improving the folding efficiency of the aircraft box. At the same time, after the support portion is turned outward, it can also reduce obstacles and difficulties when removing the aircraft box, which is conducive to removing the folded aircraft box.

[0205] 2. The arrangement of the sensor 215 and the control box 216 can detect the aircraft box and the cardboard 3 in the folding area A during the downward pressing process of the cardboard 3, thereby realizing the automatic turning outward and resetting of the folding guide limit plate 214 by controlling the power source 211 during the folding process of the cardboard, making the folding process of the aircraft box simpler and faster.

[0206] 3. The setting of the rotating pressing member 232 can press the outer wall of the part to be folded on the cardboard 3 when the cardboard 3 is folded into the paper box, and when the cardboard 3 is pressed down into the folding area A, the part to be folded on the cardboard 3 is pushed into the folding area A, so that the part to be folded on the cardboard 3 is in a basically vertical state, reducing the gap that occurs during the folding process of the airplane box, so that other parts to be folded on the cardboard 3 can be folded and fixed.

[0207] 4. The setting of the rolling member 234 can, on the one hand, prevent the outer wall of the cardboard 3 from being scratched by the first support seat 211 during the downward pressing process, thereby ensuring the aesthetics of the aircraft box after folding; on the other hand, it can reduce the resistance of the cardboard to the downward pressing, making the aircraft box folding smoother.

[0208] 5. A support surface inclined toward the outside of the folding area A is provided at the end of the second support seat 231 away from the bottom plate II 132, so that the cardboard 3 can enter the folding area A more easily during the downward pressing process, and the setting of the support surface can better guide the cardboard 3 into the folding area A; in addition, the support surface can effectively avoid the situation where the outer wall of the cardboard 3 is damaged due to the end of the second support seat 231 directly abutting against the outer wall of the cardboard 3, thereby further ensuring the aesthetics of the aircraft box after folding.

[0209] Example 5:

[0210] Referring to Figures 38 to 41 , the main difference between this embodiment and Example 4 lies in that, in this embodiment, the transmission assembly 213 comprises a transmission shaft 2131, a fixing member 2133, a guide seat 2134, a transmission rack 2135, and a transmission gear 2136. Specifically, the mounting seat 212 is provided with a through-hole through which the transmission shaft 2131 movably passes. The guide seat 2134 is fixedly mounted to the base plate 1131 via fastening screws. The guide seat 2134 is provided with a guide groove 2130, within which the transmission rack 2135 slidably fits. The side of the transmission rack 2135 proximate the power source 211 is fixedly connected to the power output portion 2112. The transmission gear 2136 is sleeved and fixed to the end of the transmission shaft 2131 proximate the transmission rack 2135. The transmission gear 2136 meshes with the transmission rack 2135, converting the linear motion of the transmission rack into rotation of the transmission shaft 2131. The fixing member 2133 is sleeved on the end of the transmission shaft 2131 away from the transmission gear 2136 and is fixedly connected to the transmission shaft 2131. The transmission shaft 2131 is fixedly connected to the folding guide limit plate 214 through the fixing member 2133, so that the folding guide limit plate 214 can rotate synchronously with the transmission shaft 2131, driving the folding guide limit plate 214 to turn outward.

[0211] In one embodiment, the fixed portion includes the main body 2111 of the power source 211, the mounting base 212, and the guide base 2134; the supporting portion includes the folding guide limit plate 214. The power source 211 is a pneumatic cylinder that, through the arrangement of a transmission rack 2135 and a transmission gear 2136, converts linear motion into rotation of the transmission shaft 2131, thereby driving the folding guide limit plate 214 to rotate or reposition. A bearing is disposed within the through-hole, through which the transmission shaft 2131 is rotatably assembled with the mounting base 212.

[0212] The foregoing description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A carton folding mechanism, characterized in that: include: A fold guide bottom frame and a supporting structure connected to the fold guide bottom frame, wherein the supporting structure comprises a plurality of fold guide wheel components, and the plurality of fold guide wheel components are evenly distributed on a single side, two pairs of sides, three sides or four sides of the fold guide bottom frame.

2. The carton folding mechanism according to claim 1, characterized in that: The folding guide wheel member comprises: a folding guide seat, wherein the upper inner portion of the folding guide seat is provided with a folding guide arc surface; and The bearing roller is rotatably assembled with the folding guide seat, and the outer circumferential surface of the bearing roller is higher than the folding guide arc surface.

3. The carton folding mechanism according to claim 2, characterized in that: The support structure also includes a support device, which includes folding guide limiting plates arranged on both sides of the rear end of the folding guide bottom frame.

4. The carton folding mechanism according to claim 3, characterized in that: The folding guide bottom frame includes: a pair of transverse support rails, a pair of longitudinal support rails and a connecting plate; the connecting plate connects the transverse support rails and the longitudinal support rails, and the transverse support rails and the longitudinal support rails are arranged to form a U-shaped frame structure.

5. The carton folding mechanism according to claim 4, characterized in that: The support structure also includes a box cover pressing assembly arranged at the rear end of the folding guide limit plate, the lower end of the box cover pressing assembly is provided with a hand-tightened adjustment screw that is pressed and limited with the longitudinal support slide rail, and the upper end of the box cover pressing assembly is fixed with a screw and a transverse support slide rail by inserting and pressing.

6. The carton folding mechanism according to claim 5, characterized in that: The connecting plate includes a bottom plate I, and the box cover pressing assembly includes a pressure rod arranged on the bottom plate I. An ear plate seat is provided between the front end of the pressure rod and the bottom plate I and is pin-connected and fixed to the pressure rod.

7. The carton folding mechanism according to claim 6, characterized in that: A support adjustment screw for supporting the height of the pressure rod is provided between the rear end of the pressure rod and the bottom plate I, and a buffer rubber cap sleeved with the support adjustment screw is provided between the upper end of the support adjustment screw and the pressure rod.

8. The carton folding mechanism according to claim 4, characterized in that: A foam support bottom plate which is nested, connected and fixed with the fold guide bottom frame is arranged in the fold guide bottom frame.

9. A carton folding mechanism, characterized in that: include: A folding guide bottom frame and a supporting structure, wherein the supporting structure is connected to the folding guide bottom frame, and a supporting side of the supporting structure extends away from one side of the folding guide bottom frame, and the supporting structure is arranged to form a folding area; The support structure comprises a support device, a fixed part of which is fixedly connected to the folding guide bottom frame, and the support part of which can rotate relative to the fixed part; During the folding process of the paper box, when the paper box is pressed toward the folding area to a preset position, the supporting part of the supporting device is turned toward the outside of the folding area.

10. The carton folding mechanism according to claim 9, characterized in that: The paper box has a swing cover, the supporting device is used to support and assist the swing cover in folding, the fixing part includes a mounting seat, and the supporting part includes a folding guide limit plate; The supporting device also includes: A power source, comprising a main body and a power output part connected to the main body, wherein the main body is fixedly assembled with the folding guide bottom frame, and the mounting seat is arranged on a side of the power output part away from the main body and fixedly assembled with the folding guide bottom frame; and The transmission assembly is rotatably assembled on the mounting seat, one end of the transmission assembly close to the main body is connected to the power output part, the folding guide limit plate is fixedly connected to the end of the transmission assembly away from the power source, and the folding guide limit plate can move synchronously with the transmission assembly.

11. The carton folding mechanism according to claim 10, characterized in that: The supporting device also includes: a sensor and a control box, wherein the sensor is installed on the folding guide bottom frame and connected to the control box via a wire, and the control box is electrically connected to the power source; during the carton folding process, when the sensor detects that there is a carton in the folding area, the control box controls the power source to drive the folding guide limit plate to flip outward.

12. The carton folding mechanism according to claim 10, characterized in that: The transmission assembly comprises: A transmission shaft movably passing through the mounting seat; a connecting member, one end of which is fixedly connected to the power output portion, and the other end of which is fixedly connected to an end of the transmission shaft close to the power source; and The fixing member is sleeved on one end of the transmission shaft away from the connecting member and fixedly connected to the transmission shaft. The transmission shaft is fixedly connected to the folding guide limit plate through the fixing member, so that the folding guide limit plate can rotate synchronously with the transmission shaft.

13. The carton folding mechanism according to claim 10, characterized in that: The transmission assembly comprises: A transmission shaft movably passing through the mounting seat; A guide seat, fixedly mounted on the folding guide bottom frame, and a guide groove is provided on the guide seat; A transmission rack is slidably mounted in the guide groove, and a side of the transmission rack close to the power source is fixedly connected to the power output part; A transmission gear is sleeved and fixed to one end of the transmission shaft close to the transmission rack, and the transmission gear meshes with the transmission rack to convert the linear motion of the transmission rack into the rotation of the transmission shaft; and The fixing member is sleeved on one end of the transmission shaft away from the transmission gear and fixedly connected to the transmission shaft. The transmission shaft is fixedly connected to the folding guide limit plate through the fixing member, so that the folding guide limit plate can rotate synchronously with the transmission shaft.

14. The carton folding mechanism according to claim 12 or 13, characterized in that: The support structure also includes a first support component fixedly assembled with the fold guide bottom frame, the first support component is arranged on the side of the fold guide limit plate away from the power source, the first support component includes a first support seat, and the end of the transmission component away from the power source passes through the fold guide limit plate and is rotatably assembled with the side of the first support seat close to the fold guide bottom frame.

15. The carton folding mechanism according to claim 14, characterized in that: The folding guide bottom frame comprises: two mutually parallel transverse support rails and two mutually parallel longitudinal support rails, the two transverse support rails and the two longitudinal support rails are respectively located in two mutually parallel planes and intersect with each other to form a plurality of intersections; each intersection is provided with a connecting plate, each connecting plate is located between the transverse support rail and the longitudinal support rail, each connecting plate is slidably connected with the corresponding transverse support rail and the longitudinal support rail, and each connecting plate can selectively fix its position on the transverse support rail and the longitudinal support rail; The fixing part of the supporting device is fixedly connected to the connecting plate.

16. The carton folding mechanism according to claim 15, characterized in that: The connecting plate comprises: a bottom plate I and a bottom plate II, the bottom plate I is arranged opposite to the bottom plate II, the fixed part of the supporting device and the first supporting assembly are both fixedly connected to the bottom plate I, and can move synchronously with the bottom plate I; The support structure further comprises a second support assembly mounted on the bottom plate II, wherein the second support assembly comprises: a second support seat, a rotating pressing member and a rotating connecting member; The second support seat is fixedly connected to the bottom plate II, the rotating pressing member is installed on the second support seat and can rotate relative to the second support seat; the rotating connecting member has a first end and a second end, the first end is connected to the second support seat, and the second end is connected to the rotating pressing member; During the folding process of the carton, when the carton is pressed toward the folding area, at least a portion of the carton can drive the rotating pressing member to rotate, so that the rotating pressing member is pressed against the outer wall of the carton and pushes the part of the carton to be folded toward the side close to the bottom plate I.

17. The carton folding mechanism according to claim 16, characterized in that: The rotating pressing member comprises: A driving part, at least a portion of which protrudes from an end surface of the second supporting seat close to the bottom plate I; A pressing part connected to the driving part, the pressing part having a flattening end surface, under the drive of the driving part, the flattening end surface is pressed against the outer wall of the paper box and pushes the part to be folded of the paper box to the side close to the bottom plate I; and, The counterweight part is connected to the side of the pressing part away from the driving part. After the paper box is folded and taken out, the counterweight part resets the rotating pressing part by its own gravity.

18. The carton folding mechanism according to claim 16, characterized in that: A rolling member is arranged on the second support seat, wherein the rolling member partially protrudes from the end face of the second support seat close to the folding area, and the rolling member can roll relative to the second support seat, thereby converting the sliding friction between the paper box and the second support seat during the folding process into rolling friction.

19. A carton folding mechanism, characterized in that: It includes a folding guide bottom frame and a supporting structure connected to the folding guide bottom frame, the supporting structure includes a stop assembly arranged on both sides of the front end of the folding guide bottom frame, the stop assembly includes a stop block, a stop block slide rail connected to the folding guide bottom frame is provided between the stop block and the folding guide bottom frame, the stop block can slide on the stop block slide rail and can be selectively fixed in the sliding position.

20. The carton folding mechanism according to claim 19, characterized in that: The block slide rail comprises a block main slide rail, a telescopic slide rail movably inserted and limited with the block main slide rail is arranged inside the block main slide rail, the block is movably inserted with the telescopic slide rail, the block is movably sleeved with the block main slide rail, and a support column is arranged between the lower end of the telescopic slide rail and the folding guide bottom frame.

21. The carton folding mechanism according to claim 20, characterized in that: The support structure also includes a support device, which includes folding guide limit plates arranged on both sides of the rear end of the folding guide bottom frame, and a folding guide limit plate installation slider is provided between the folding guide limit plate and the folding guide bottom frame and is movably plugged and fixed to the folding guide bottom frame.

22. The carton folding mechanism according to claim 21, characterized in that: The support structure also includes a box cover pressing assembly arranged at the rear end of the fold guide limiting plate, and connecting plates are provided between the box cover pressing assembly and the fold guide bottom frame and between the stop assembly and the fold guide bottom frame.

23. The carton folding mechanism according to claim 22, characterized in that: The rear end of the stopper is provided with a stopper limiting slider which is pressed against the telescopic slide rail, and the stopper limiting slider, the folding guide limiting plate mounting slider and the connecting plate are all provided with hand-tightened adjusting screws for sliding, pressing and limiting.

24. A carton folding mechanism, characterized in that: The invention comprises a folding guide bottom frame and a supporting structure connected to the folding guide bottom frame, wherein the supporting structure comprises two stopper assemblies and two supporting devices, wherein the two stopper assemblies each comprise a fixed baffle plate, wherein the fixed baffle plate is arranged on a first side of the folding guide bottom frame, and the two supporting devices each comprise a folding guide limiting plate, wherein the folding guide limiting plate is arranged on a second side of the folding guide bottom frame; the first side is opposite to the second side, and the two fixed baffle plates and the two folding guide limiting plates are arranged to form a quadrilateral folding area; Among them, the stop assembly includes at least one of the fixed baffles, and the end face on the side opposite to the corresponding supporting device is provided with a guide surface, and the guide surface is an inclined plane or an arc surface transitioning from the upper end to the lower end, so that the lower end of the guide surface is closer to the folding area.

25. The carton folding mechanism according to claim 24, characterized in that: A stopper slide rail is arranged at the upper end of the fixed stopper plate, and an arc-shaped guide surface is arranged on one side of the stopper slide rail close to the folding area, and the arc-shaped guide surface faces the other fixed stopper plate.

26. The carton folding mechanism according to claim 25, characterized in that: A third slide groove is arranged at the top of the fixed baffle plate, and a first limiting portion is arranged at the bottom of the baffle slide rail. The first limiting portion slides in the third slide groove, so that the baffle slide rail is slidably connected to the fixed baffle plate.

27. The carton folding mechanism according to claim 26, characterized in that: The stopper slide rail comprises a stopper main slide rail, the arc-shaped guide surface is arranged on the stopper main slide rail, the first limiting portion is arranged at the bottom of the stopper main slide rail, and a stopper is slidably connected to the stopper main slide rail.

28. The carton folding mechanism according to claim 27, characterized in that: The block slide rail also includes a telescopic slide rail, which is sleeved on the block main slide rail, and the block main slide rail is slidably connected to the telescopic slide rail in a limitable manner via a first bolt; or / and, the block is detachably connected with an additional block.

29. The carton folding mechanism according to claim 24, characterized in that: At least one first folding guide wheel is movably installed between the two fixed baffles; at least one second folding guide wheel is movably installed between the two folding guide limiting plates; and at least one third folding guide wheel is movably installed between the opposite fixed baffles and the folding guide limiting plates.

30. The carton folding mechanism according to claim 29, characterized in that: A first roller is installed on a side of the first folding guide wheel component close to the folding area; and a third roller is installed on a side of the third folding guide wheel component close to the folding area.

31. The carton folding mechanism according to claim 30, characterized in that: The first folding guide wheel component is higher than the third folding guide wheel component; during the folding process of the paper box, the third roller abuts against the paper box before the first roller, so that the side wings of the paper box are folded into place before the front support plate.

32. The carton folding mechanism according to claim 24, characterized in that: At least one ear plate seat is provided between the two folding guide limit plates; A pressure rod is hinged on the ear plate seat, and a stop block is movably connected to the pressure rod; and / or, A rotating assembly is provided at the upper end of the ear plate seat, and an open-ended clearance groove is provided at one end of the rotating assembly. The hinged end of the ear plate seat is placed in the clearance groove and hinged to the rotating assembly; a pressure rod is fixedly installed at the other end of the rotating assembly so that the pressure rod is in a straight line with the center line of the ear plate seat.

33. The carton folding mechanism according to any one of claims 24 to 32, characterized in that: The folding guide bottom frame includes two mutually parallel transverse supporting rails and two mutually parallel longitudinal supporting rails, the two transverse supporting rails and the two longitudinal supporting rails are respectively located in the upper and lower planes and intersect with each other; the transverse supporting rails and the longitudinal supporting rails are provided with connecting plates at each intersection, the connecting plates are respectively slidably connected with the corresponding transverse supporting rails and the longitudinal supporting rails, and the connecting plates can selectively fix their positions on the transverse supporting rails and the longitudinal supporting rails.

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