A paper container bottom forming mechanism

Abstract

The present invention relates to a paper container bottom forming mechanism, which uses a fixed seat as an integral support, a slide plate is provided on the fixed seat, a driving unit between the slide plate and the fixed seat causes the slide plate to linearly reciprocate on the fixed seat, a multi-stage thrust unit is provided on the slide plate, a limiting unit is used to realize its multi-stage thrust, and an expansion unit cooperates with the front end of the multi-stage thrust unit to realize the bottom support forming of the paper container. The present invention adopts horizontal operation, which facilitates the coordination of various mechanisms in the paper container forming equipment on the same horizontal plane and eliminates some lifting mechanisms; through the provision of the expansion unit, the alignment accuracy requirements of the paper container and the forming mechanism are low, and the requirements for the completion degree of the bottom of the paper container itself are low; the bottom of the paper container is gradually expanded during the forming process, with a high yield rate and good finished product appearance; only a single station is required to complete the bottom support forming work of the paper container, which simplifies the equipment structure and reduces the precision requirements for multi-station operation; it is highly efficient and is conducive to large-scale production and processing.

Description

Technical Field

[0001] The present invention relates to the technical field of manufacturing containers made of paper, cardboard or materials processed in a paper-like manner, and in particular to a bottom forming mechanism for a paper container. Background Art

[0002] Paper containers generally refer to paper packaging containers, which are made of paper or cardboard for the purpose of packaging or holding, including but not limited to paper cups and paper bowls.

[0003] In the prior art, the traditional method of forming the bottom of a paper container includes providing a stop block that abuts against the bottom of the paper container, which moves in a vertical direction and falls to match the bottom of the paper container to complete the bottom support and forming work; however, this bottom support and forming method requires, on the one hand, alignment of the stop block with the bottom of the paper container, and has high requirements on the completion degree of the bottom of the paper container itself; on the other hand, once there are defects in the bottom of the paper container itself, the falling of the stop block may cause curling of the upper edge of the bottom of the paper container, and even worse, it may directly cause the bottom of the paper container to be scrapped.

[0004] The existing technology requires two or more workstations to perform bottom support and gluing work at different positions on the bottom of paper cups or paper bowls. The processing operation of supporting the bottom of paper containers has a high scrap rate and high uncertainty, which is not conducive to mass production. Summary of the Invention

[0005] The present invention solves the problems existing in the prior art and provides a paper container bottom forming mechanism with an optimized structure.

[0006] The technical solution adopted by the present invention is a paper container bottom forming mechanism, comprising a fixed seat, a slide plate provided on the fixed seat, and a multi-stage thrust unit provided on the slide plate;

[0007] A driving unit is provided between the slide and the fixing seat for causing the slide to move linearly back and forth on the fixing seat;

[0008] A limiting unit for multi-stage advancement is provided in conjunction with the multi-stage advancement unit;

[0009] A plurality of unfolding units for forming paper containers are provided at the front end of the multi-stage advancing unit.

[0010] Preferably, the fixed seat includes a lower base and an upper plate that cooperates with the top edge of the lower base; the driving unit includes a power input shaft that vertically passes through the lower base, and a cam unit is provided outside the power input shaft in the fixed seat, and a cam follower is provided to cooperate with the cam unit; the top of the cam follower is fixedly connected to the slide and cooperates with the support on the upper plate; the bottom of the power input shaft is provided with an input transmission wheel.

[0011] Preferably, the cam unit includes a cam sleeved on the outside of the power input shaft, an annular groove is provided on the outside of the cam, and the cam follower is provided in the annular groove.

[0012] Preferably, a slider is provided at the bottom of the slide plate, and a linear guide rail is provided on the fixed seat corresponding to the slider.

[0013] Preferably, the multi-stage thrust unit comprises a sliding shaft, the shaft head of the sliding shaft is arranged forward, a fixed disk is fixed outside the shaft head, a limiting unit is provided to cooperate with the fixed disk, and an expansion unit is provided inside the shaft head of the sliding shaft;

[0014] The multi-stage thrust unit further comprises a top shaft, wherein the sliding shaft excluding the shaft head is slidably sleeved on the outside of the top shaft, and a shaft sleeve is slidably fitted on the outside of the sliding shaft, and the rear end of the shaft sleeve is fixedly arranged on the top shaft;

[0015] A protection unit is provided in conjunction with the multi-stage forward unit;

[0016] The shaft sleeve is matched with the slide plate.

[0017] Preferably, the limiting unit includes a screw rod parallel to the sliding shaft and arranged in conjunction with the fixed plate. A fixed plate is provided across the outer side of the rear of the multi-stage advancement unit. The screw rod passes through the fixed plate. Limiting nuts are provided on the outside of the screw rod on the front and rear sides of the fixed plate.

[0018] Preferably, the protection unit includes a base arranged outside the sleeve, and a first compression spring is provided between the base and the fixed disk;

[0019] The protection unit further includes a second compression spring arranged between the rear end portion of the sliding shaft and the rear end portion of the shaft sleeve.

[0020] Preferably, a vertical plate is fixed between the shaft sleeve and the slide plate.

[0021] Preferably, the unfolding unit includes a first end plate, a first pressure plate, a connecting ring plate and a second pressure plate arranged in sequence from front to back at the front end of the shaft head, and the first end plate, the first pressure plate, the connecting ring plate and the second pressure plate are matched with the front end of the top shaft to provide a first through hole; a plurality of springs are radially distributed in the connecting ring plate, and a support block for paper container forming is radially provided corresponding to any spring, and the support block is matched with the front end of the top shaft.

[0022] Preferably, the unfolding unit comprises four bearings arranged in front of the top shaft, the projections of two adjacent bearings on the vertical plane are perpendicular, and a bearing seat is provided corresponding to any bearing;

[0023] A pair of opposing bearing seats are fixedly mounted on the inner rear sides of corresponding first sliding blocks. A first support block for forming a paper container is also fixed to the inner front side of the first sliding block on the bearing seat side. A first sliding seat is provided on the outer rear side of each first sliding block. The first sliding seat is connected to a spring facing the corresponding bearing seat, and the spring abuts against the bearing seat.

[0024] Another set of opposite bearing seats is fixedly arranged on the rear side of the inner end of the corresponding second sliding block, and a second support block for forming a paper container is also fixed on the front side of the inner end of the second sliding block on the bearing seat side. A second slide seat is provided on the rear side of the outer end of each second sliding block; a hinge shaft is provided at the inner end of each second sliding block, and one end of two follower rods is hingedly connected to the outer end of the hinge shaft. The hinge shaft is arranged on the inner side of the second support block, and the two follower rods are arranged on both sides of the corresponding second support block;

[0025] The other ends of the two follower rods are hinged to the front side of the inner end of the third sliding block, the front side of the third sliding block outside any of the follower rods is provided with a third support block, and the rear side of the outer end of the third sliding block is provided with a third slide seat;

[0026] The third support block is arranged in cooperation with the first support block and the second support block;

[0027] The shaft head includes a second end plate and an end shell. The second end plate and the end shell cooperate with the front end of the top shaft to provide a second through hole, and the end shells corresponding to the first slide and the first sliding block, the second slide and the second sliding block, and the third slide and the third sliding block are provided with a third through hole.

[0028] The present invention relates to a paper container bottom forming mechanism with an optimized structure, which uses a fixed seat as an integral support, a slide plate is arranged on the fixed seat, a driving unit between the slide plate and the fixed seat causes the slide plate to move linearly back and forth on the fixed seat, a multi-stage thrust unit is arranged on the slide plate, a limiting unit is used to realize the multi-stage thrust of the multi-stage thrust unit, and an expansion unit is used in conjunction with the front end of the multi-stage thrust unit to realize the bottom support and forming of the paper container.

[0029] The beneficial effects of the present invention are:

[0030] (1) The horizontal operation facilitates the coordination of various mechanisms in the paper container forming equipment on the same horizontal plane, eliminating the need for some lifting mechanisms;

[0031] (2) Through the setting of the unfolding unit, the alignment accuracy requirements between the paper container and the forming mechanism are low, and the completion requirements for the bottom of the paper container itself are low;

[0032] (3) The bottom of the paper container gradually expands during the molding process, resulting in a high yield rate and good finished product appearance;

[0033] (4) Only a single station is needed to complete the bottom support and forming work of the paper container, simplifying the equipment structure and reducing the precision requirements for multi-station operation;

[0034] (5) High efficiency, conducive to large-scale production and processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0036] Figure 2 It is a side view structural schematic diagram of the present invention;

[0037] Figure 3 for Figure 2 AA cross-sectional view structural diagram;

[0038] Figure 4 This is a schematic diagram of the main structure of the present invention;

[0039] Figure 5 for Figure 4 BB cross-sectional view structural diagram;

[0040] Figure 6 for Figure 4 CC cross-sectional view structural diagram;

[0041] Figure 7 for Figure 4 DD cross-sectional view structural diagram;

[0042] Figure 8 This is a side view structural diagram of the cooperation between the shaft head and the top shaft in Example 2 of the present invention;

[0043] Figure 9 for Figure 8 EE cross-sectional view structural diagram;

[0044] Figure 10 This is a schematic diagram of the front view structure of the shaft head and the top shaft in embodiment 2 of the present invention;

[0045] Figure 11 for Figure 10 FF cross-sectional view structural diagram;

[0046] Figure 12 This is a schematic structural diagram of a partial cross-section view in which the second end plate and its connecting members are omitted in Example 2;

[0047] Figure 13 In the figure, (a) is a schematic diagram of the initial state of the expansion unit of Example 1, and (b) is a schematic diagram of the expansion unit of Example 1 in the expanded state;

[0048] Figure 14In the figure, (c) is a schematic diagram of the initial state of the expansion unit of Example 2, and (d) is a schematic diagram of the expansion state of the expansion unit of Example 2. DETAILED DESCRIPTION

[0049] The present invention is further described in detail below with reference to the embodiments, but the protection scope of the present invention is not limited thereto.

[0050] The present invention relates to a paper container bottom forming mechanism, comprising a fixing seat 1, a slide plate 2 provided on the fixing seat 1, and a multi-stage thrust unit provided on the slide plate 2;

[0051] A driving unit is provided between the slide plate 2 and the fixing base 1 for causing the slide plate 2 to move linearly back and forth on the fixing base 1;

[0052] A limiting unit for multi-stage advancement is provided in conjunction with the multi-stage advancement unit;

[0053] A plurality of unfolding units for forming paper containers are provided at the front end of the multi-stage advancing unit.

[0054] In the present invention, the bottom forming of the paper container refers to "bottom support", that is, a mechanism is set at the bottom outside the container, and the inner bottom and the lower part of the outer cup tube are bonded together by extrusion.

[0055] In the present invention, the fixing base 1 is used as the overall support, which can be plugged into the working table of the paper container processing equipment.

[0056] In the present invention, a slide plate 2 is provided on the fixed seat 1. In fact, the linear reciprocating motion of the slide plate 2 on the fixed seat 1 can be realized by many other methods. In order to realize the linkage between the forming mechanism and other mechanisms of the paper container processing equipment, a driving unit between the slide plate 2 and the fixed seat 1 is used to make the slide plate 2 move linearly reciprocatingly on the fixed seat 1. The driving force of the driving unit generally comes from external force.

[0057] In the present invention, a multi-stage advancing unit is provided on the slide plate 2. Specifically, the output end of the forming mechanism is delivered in sections, so the limiting unit is used to realize the "multi-stage" advancing of the multi-stage advancing unit.

[0058] In the present invention, the bottom support molding of the paper container is achieved by cooperating with the output end of the molding mechanism, that is, the output end of the multi-stage thrust unit and the expansion unit.

[0059] The fixed base 1 includes a lower base 12 and an upper plate 11 that cooperates with the top edge of the lower base 12; the driving unit includes a power input shaft 3 that vertically passes through the lower base 12, and a cam unit is provided outside the power input shaft 3 in the fixed base 1, and a cam follower 44 is provided to cooperate with the cam unit; the top of the cam follower 44 is fixedly connected to the slide plate 2 and is arranged to cooperate with the support 13 on the upper plate.

[0060] The cam unit includes a cam 42 sleeved on the outside of the power input shaft 3 . An annular groove 43 is provided on the outside of the cam 42 , and the cam follower 44 is provided in the annular groove 43 .

[0061] An input transmission wheel 31 is provided at the bottom of the power input shaft 3 .

[0062] In the present invention, the fixed seat 1 is set as a hollow structure, which is used to set the cam unit therein, thereby realizing the reciprocating linear motion of the multi-stage thrust unit. The setting form of the fixed seat 1 is not single, but the cavity therein needs to be ensured; obviously, the power input shaft 3 and the bottom plate of the lower base 12 of the fixed seat 1 are matched with a bearing 14.

[0063] In the present invention, the power input shaft 3 starts to rotate after obtaining the driving force, the fixed seat 1 itself does not move, and the cam unit therein cooperates to rotate, and then the output end of the cam follower 44 drives the slide plate 2 to realize linear reciprocating motion; specifically, the cam 42 in the cam unit is driven to rotate by the power input shaft 3, and the shape of the annular groove 43 can be set by those skilled in the art based on actual needs, so that the motion range of the output end of the cam follower 44 is limited to the support 13 on the upper plate 11, that is, in fact, the cam follower 44 is under the action of the cam 42, although there is a relative displacement with the annular groove 43, but in fact its stroke relative to the horizontal plane is only the length limited by the support 13; the support 13 can also play the role of oil blocking.

[0064] In the present invention, generally speaking, the external force input to the power input shaft 3 is realized by the input transmission wheel 31 , and the input transmission wheel 31 includes but is not limited to an input sprocket and an input gear.

[0065] A slider 21 is provided at the bottom of the slide plate 2 , and a linear guide rail 22 is provided on the fixing seat 1 corresponding to the slider 21 .

[0066] In the present invention, in order to ensure the smooth movement of the slide 2, a slider 21 is provided at its bottom, and a linear guide rail 22 is provided on the fixed seat 1. The slider 21 never deviates from the direction defined by the linear guide rail 22, thereby ensuring the safety of the operation.

[0067] The multi-stage thrust unit includes a sliding shaft 5, wherein the shaft head 51 of the sliding shaft 5 is arranged forward, a fixed disk 52 is fixed to the outside of the shaft head 51, a limiting unit is provided to cooperate with the fixed disk 52, and an expansion unit is provided inside the shaft head 51 of the sliding shaft 5;

[0068] The multi-stage thrust unit further includes a top shaft 61. The sliding shaft 5, excluding the shaft head 51, is slidably sleeved on the top shaft 61. A sleeve 62 is slidably fitted on the outside of the sliding shaft 5. The rear end of the sleeve 62 is fixed to the top shaft 61.

[0069] A protection unit is provided in conjunction with the multi-stage forward unit;

[0070] The shaft sleeve 62 is arranged in cooperation with the slide plate 2 .

[0071] The limiting unit includes a screw 53 parallel to the sliding shaft 5 and cooperates with the fixed plate 52. A fixed plate 54 is provided across the outer side of the rear of the multi-stage advancement unit. The screw 53 is provided through the fixed plate 54. Limiting nuts 55 are provided on the outside of the screw 53 on the front and rear sides of the fixed plate 54.

[0072] The protection unit includes a base 63 disposed outside the shaft sleeve 62, and a first compression spring 64 is provided between the base 63 and the fixed plate 52;

[0073] The protection unit further includes a second compression spring 65 provided between the rear end of the sliding shaft 5 and the rear end of the sleeve 62 .

[0074] A vertical plate 66 is fixedly provided between the shaft sleeve 62 and the slide plate 2 .

[0075] In the present invention, the working principle of the multi-stage thrust unit in the stage of thrust support bottom forming is that the sliding shaft 5 and the top shaft 61 (matching the shaft sleeve 62) move together for a distance. When the sliding shaft 5 is limited by the limiting unit, the sliding shaft 5 no longer moves forward, but at this time the top shaft 61 and the shaft sleeve 62 are still driven forward (indirectly) by the driving unit until the front end of the top shaft 61 acts on the expansion unit of the shaft head 51 of the sliding shaft 5.

[0076] In the present invention, the top shaft 61 and the shaft sleeve 62 outside it constitute an inner and outer double-layer structure. In this structure, there is a gap between the inner and outer layers. The sliding shaft 5 (except the shaft head 51) is inserted from this gap to cooperate with the top shaft 61 and the shaft sleeve 62. In order to ensure that the top shaft 61 can achieve a longer distance of travel in the multi-stage forward unit, the top shaft 61 and the shaft sleeve 62 are connected at the rear end, that is, the top shaft 61 can be driven forward by driving the shaft sleeve 62.

[0077] In the present invention, in order to achieve limiting, a fixed disk 52 is fixedly set outside the shaft head 51, and a limiting unit is set in conjunction with the fixed disk 52; specifically, a screw 53 parallel to the sliding shaft 5 is set on the fixed disk 52, generally two, which are arranged on both sides of the sliding shaft 5, and a fixed plate 54 is spanned on the outer side of the rear part of the multi-stage advance unit. Usually, both sides of the fixed plate 54 are set on the fixed seat 1 through a fixing body 56 to ensure stability and firmness. The screw 53 passes through the fixed plate 54 and the screw 53 on the front and rear sides of the fixed plate 54 are matched with a limiting nut 55 for limiting the stroke. When it advances or retreats to a certain position, it cannot continue to move.

[0078] In the present invention, as shown in the accompanying drawings, if necessary, a protective cover 57 can be provided outside the screw 53 of the fixing plate 54 to prevent the pre-setting failure of the screw 53 and the limiting nut 55 due to misoperation.

[0079] In the present invention, the structure of the fixing body 56 can be configured according to the needs of those skilled in the art, such as being configured as an L-shaped body facing both sides.

[0080] In the present invention, after the limiting unit of the multi-stage thrust unit has completed the limiting, the top shaft 61 still needs to continue to move. Therefore, in addition to the shaft sleeve 62 ensuring its movement, a protection unit is also used to protect all components, including:

[0081] A first compression spring 64 is provided between the base 63 outside the sleeve 62 and the fixed plate 52 to ensure that the sleeve 62 does not directly collide with the fixed plate 52 to cause unnecessary losses, while obtaining the initial kinetic energy for retreat;

[0082] A second compression spring 65 is arranged between the rear end of the sliding shaft 5 and the rear end of the sleeve 62. To be precise, the second compression spring 65 is arranged in the gap between the top shaft 61 and the rear end connection position of the sleeve 62. On the one hand, a certain required preload force will be given during assembly to ensure rigidity. When the front end of the top shaft 61 acts on the shaft head 51 and is overloaded, the second compression spring 65 can be further compressed, thereby playing a role of unloading. On the other hand, it ensures that the sliding shaft 5 will not directly collide with the rear end connection position of the top shaft 61 and the sleeve 62, causing unnecessary losses, and at the same time obtain the initial kinetic energy of the relative movement of the two.

[0083] In the present invention, the shaft sleeve 62 cooperates with the slide plate 2. Generally, a vertical plate 66 is fixedly provided between the shaft sleeve 62 and the slide plate 2. In fact, in actual application, the shaft sleeve 62, the base 63 and the vertical plate 66 are integrated.

[0084] For the unfolding unit, the present invention proposes at least two embodiments.

[0085] Example 1

[0086] The unfolding unit includes a first end plate 71, a first pressure plate 72, a connecting ring plate 73 and a second pressure plate 74, which are arranged in sequence from front to back at the front end of the shaft head 51. The first end plate 71, the first pressure plate 72, the connecting ring plate 73 and the second pressure plate 74 are matched with the front end of the top shaft 61 to provide a first through hole 75; a plurality of springs 76 are radially distributed in the connecting ring plate 73, and a support block 77 for paper container forming is radially provided corresponding to any spring 76, and the support block 77 is matched with the front end of the top shaft 61.

[0087] In this embodiment, the shaft head 51 of the sliding shaft 5 is arranged forward, and an expansion unit is provided therein; specifically, the expansion unit includes a first end plate 71, a first pressure plate 72, a connecting ring plate 73 and a second pressure plate 74 which are arranged in sequence from front to back at the front end of the shaft head 51, and the first end plate 71, the first pressure plate 72, the connecting ring plate 73 and the second pressure plate 74 cooperate with the front end of the top shaft 61 to set a first through hole 75, and the first end plate 71 is used to reinforce the end, and the connecting ring plate 73 between the first pressure plate 72 and the second pressure plate 74 is configured into an empty groove, in which a plurality of springs 76 are radially distributed, and the support block 77 is connected with the spring 76, so that the axial limitation and radial concession of the support block 77 are realized by this empty groove.

[0088] In this embodiment, it is obvious that the surface of the support block 77 facing the central axis of the shaft head 51 generally matches the front end of the top shaft 61. If the front end of the top shaft 61 is conical, then the surfaces of these support blocks 77 facing the central axis of the shaft head 51 constitute a conical surface as a whole, thereby ensuring that these support blocks 77 can be pushed away by the front end of the top shaft 61.

[0089] In this embodiment, during actual application, the front end of the support block 77 can correspond to different cup bottom shapes (such as round, square, triangular, oval, etc.) when unfolded, so these shapes can be split into multiple support blocks 77 for production, which can be better retracted when not unfolded and achieve different bottom support molding effects when unfolded.

[0090] In this embodiment, the apertures of the first through holes 75 are actually different. For example, when performing the bottom support forming operation, after each support block 77 is unfolded, its outer circle contour and the first through hole 75 (inner circle contour in this case) of the end plate 71 clamp the curled edge portion of the cup bottom.

[0091] Example 2

[0092] The unfolding unit includes four bearings 80 arranged in front of the top shaft 61. The projections of two adjacent bearings 80 on the vertical plane are perpendicular. A bearing seat 81 is provided corresponding to any bearing 80.

[0093] A pair of opposing bearing seats 81 are fixedly mounted on the inner rear sides of corresponding first sliding blocks 82. A first support block 83 for forming a paper container is also fixed to the inner front side of the first sliding block 82 on the bearing seat 81 side. A first slide seat 84 is provided on the outer rear side of each first sliding block 82. A spring 85 is connected to the first slide seat 84, facing the corresponding bearing seat 81, and the spring 85 abuts against the bearing seat 81.

[0094] Another set of opposing bearing seats 81 is fixed to the rear side of the inner end of the corresponding second sliding block 86. A second support block 87 for forming a paper container is also fixed to the front side of the inner end of the second sliding block 86 on the bearing seat 81. A second slide seat 88 is provided on the rear side of the outer end of each second sliding block 86. A hinge shaft 89 is provided at the inner end of each second sliding block 86. One end of two follower rods 90 are hingedly connected to the hinge shaft 89. The hinge shaft 89 is provided on the inner side of the second support block 87, and the two follower rods 90 are provided on both sides of the corresponding second support block 87.

[0095] The other ends of the two follower rods 90 are hinged to the front side of the inner end of the third sliding block 91. A third support block 92 is provided on the front side of the third sliding block 91 on the outer side of any of the follower rods 90, and a third sliding seat 93 is provided on the rear side of the outer end of the third sliding block 91.

[0096] The third support block 92 is arranged in cooperation with the first support block 83 and the second support block 87;

[0097] The shaft head 51 includes a second end plate 94 and an end shell 95. The second end plate 94 and the end shell 95 cooperate with the front end of the top shaft 61 to provide a second through hole 96, and the end shell 95 corresponding to the first slide 84 and the first sliding block 82, the second slide 88 and the second sliding block 86, and the third slide 93 and the third sliding block 91 is provided with a third through hole 97.

[0098] In this embodiment, the inner end refers to the end of the corresponding sliding block facing the central axis of the shaft head, and the outer end refers to the other end of the corresponding sliding block.

[0099] In this embodiment, two groups of bearings 80 are provided corresponding to the top shaft 61, and the front end of the top shaft 60 is conical or truncated cone-shaped, that is, when the top shaft 61 is pushed in, the bearing 80 is driven by it to move outward, thereby driving the corresponding first sliding block 82 and second sliding block 86 to move outward, and then driving the first support block 83 and second support block 87 thereon to expand outward. During this process, the follower rod 90 also moves outward with the second sliding block 86, and at the same time, the first support block 83 and the second support block 87 respectively press against the third support block 92 outward, so the angle between the two follower rods 90 in each group increases, and the third sliding block 91 moves outward, driving the third support block 92 thereon to expand outward, until the first support block 83, the second support block 87 and the third support block 92 are expanded, and the overall outer edge is a preset shape, generally a square.

[0100] In this embodiment, when the top shaft 61 retreats, under the action of the spring 85, the first slide 84 and the first sliding block 82, the second slide 88 and the second sliding block 86, and the third slide 93 and the third sliding block 91 are retracted due to their mutual cooperation.

[0101] In this embodiment, the assembly of the second end plate 94 and the end shell 95, the second through hole 96 set in the second end plate 94 and the end shell 95 to cooperate with the top shaft 61, and the third through hole 97 set corresponding to each group of slides and sliding blocks are contents that can be easily understood by those skilled in the art, and those skilled in the art can set them according to their needs.

[0102] In this embodiment, the apertures of the second through holes 96 are actually different. For example, when performing the bottom support forming operation, after all the first support blocks 83, the second support blocks 87 and the third support blocks 92 are unfolded, their outer circle contours and the second through holes 96 (inner circle contour at this time) of the second end plate 94 clamp the curled edge portion of the bowl bottom.

[0103] The working principle of the present invention is:

[0104] When the cam 42 is in progress, the vertical plate 66 moves forward. After a certain distance, the limit nut 55 at the rear end of the screw 53 contacts the fixed plate 54, and the fixed plate 52 and the shaft head 51 stop moving forward. The vertical plate 66 continues to move forward with the sleeve 62 and the top shaft 61, and pushes each support block 77, or the first support block 83, the second support block 87 and the third support block 92 to slide radially outward through the wedge surface at the front end of the top shaft 61. When the vertical plate 66 stops moving forward, the outer circle contours of each support block 77, or the first support block 83, the second support block 87 and the third support block 92 just form a complete bottom support shape, as shown in FIG. Figure 13 (b) Figure 14 (d)

[0105] When the cam 42 returns, the vertical plate 66 drives the sleeve 62 and the top shaft 61 to retreat, and each support block 77 or the first support block 83, the second support block 87 and the third support block 92 are reset under the action of the spring 76 (the spring 85 in another embodiment) until the vertical plate 66 retreats to the rear end;

[0106] At this point, the vertical plate 66 moves forward and backward, and the support blocks 77 or the first support block 83, the second support block 87 and the third support block 92 expand and contract, completing a complete bottom support forming action.

[0107] Taking a paper cup as an example, in Example 1, when the bottom of the cup is supported and formed, its curled edge is placed between the outside of all support blocks 77 and the first through hole 75 of the first end plate 71 by the forming mechanism of this embodiment. After each support block 77 is unfolded, its outer circle contour and the first through hole 75 (inner circle contour) of the end plate 71 clamp the curled edge of the cup bottom, completing the bottom support forming.

[0108] Taking a square paper bowl as an example, in the case of Example 2, when the bottom of the bowl is supported and formed, its curled edge is placed between all the first support blocks 83, the second support blocks 87 and the third support blocks 92 and the second through holes 96 of the second end plate 94 of the forming mechanism of this embodiment. After all the first support blocks 83, the second support blocks 87 and the third support blocks 92 are unfolded, their outer circle contours and the second through holes 96 (inner circle contours) of the second end plate 94 clamp the curled edge part of the bowl bottom to complete the bottom support forming.

Claims

1. A paper container bottom forming mechanism, characterized by: It includes a fixed seat, a slide plate is provided on the fixed seat, a multi-stage thrust unit is provided on the slide plate, a sliding shaft is provided, the shaft head of the sliding shaft is arranged forward, a fixed disk is fixed to the outside of the shaft head, and a limiting unit is provided in cooperation with the fixed disk; it also includes a top shaft, the sliding shaft except the shaft head is slidably sleeved on the outside of the top shaft, a shaft sleeve is slidably provided on the outside of the sliding shaft, and the rear end of the shaft sleeve is fixed to the top shaft; the shaft sleeve is provided in cooperation with the slide plate; A driving unit is provided between the slide and the fixing seat for causing the slide to move linearly back and forth on the fixing seat; A limiting unit for multi-stage advancement is provided in conjunction with the multi-stage advancement unit; A protection unit is provided in conjunction with the multi-stage thrust unit; the protection unit includes a base provided outside the shaft sleeve, a first compression spring is provided between the base and the fixed plate; the protection unit also includes a second compression spring provided between the rear end of the sliding shaft and the rear end of the shaft sleeve; A plurality of unfolding units for forming paper containers are provided at the front end of the multi-stage advancing unit; The unfolding unit includes a first end plate, a first pressure plate, a connecting ring plate, and a second pressure plate, which are sequentially arranged at the front end of the shaft head from front to back. The first end plate, the first pressure plate, the connecting ring plate, and the second pressure plate are matched with the front end of the top shaft and are provided with a first through hole; a plurality of springs are radially distributed inside the connecting ring plate, and a support block for forming a paper container is provided radially corresponding to each spring, and the support block is matched with the front end of the top shaft; Or, the unfolding unit includes four bearings cooperatedly arranged in front of the top shaft, the projections of two adjacent bearings on the vertical plane are perpendicular, and a bearing seat is provided corresponding to any bearing; a group of relative bearing seats is fixedly arranged on the rear side of the inner end of the corresponding first sliding block, and the front side of the inner end of the first sliding block on the bearing seat side is also fixed with a first support block for forming a paper container, and a first slide is provided on the rear side of the outer end of any first sliding block; the first slide is connected to a spring facing the corresponding bearing seat, and the spring is in contact with the bearing seat; another group of relative bearing seats is fixedly arranged on the rear side of the inner end of the corresponding second sliding block, and the front side of the inner end of the second sliding block on the bearing seat side is also fixed with a second support block for forming a paper container, and a second slide is provided on the rear side of the outer end of any second sliding block; any The inner end of a second sliding block is provided with a hinge shaft, and one end of two follower rods is hinged to the outside of the hinge shaft, and the hinge shaft is arranged on the inner side of the second support block, and the two follower rods are arranged on both sides of the corresponding second support block; the other ends of the two follower rods are hinged to the front side of the inner end of the third sliding block, and a third support block is provided on the front side of the third sliding block on the outside of any follower rod, and a third slide is provided on the rear side of the outer end of the third sliding block; the third support block is arranged in cooperation with the first support block and the second support block; the shaft head includes a second end plate and an end shell, and the second end plate and the end shell cooperate with the front end of the top shaft to provide a second through hole, and the end shell corresponding to the first slide and the first sliding block, the second slide and the second sliding block, and the third slide and the third sliding block is provided with a third through hole.

2. A paper container bottom forming mechanism according to claim 1, characterized in that: The fixed seat includes a lower base and an upper plate that cooperates with the top edge of the lower base; the driving unit includes a power input shaft that vertically passes through the lower base, and a cam unit is provided outside the power input shaft in the fixed seat, and a cam follower is provided to cooperate with the cam unit; the top of the cam follower is fixedly connected to the slide and is provided to cooperate with the support on the upper plate; the bottom of the power input shaft is provided with an input transmission wheel.

3. A paper container bottom forming mechanism according to claim 2, characterized in that: The cam unit includes a cam sleeved on the outside of the power input shaft, an annular groove is provided on the outside of the cam, and the cam follower is provided in the annular groove.

4. A paper container bottom forming mechanism according to claim 1, characterized in that: A sliding block is provided at the bottom of the slide plate, and a linear guide rail is provided on the fixed seat corresponding to the sliding block.

5. The paper container bottom forming mechanism according to claim 1, characterized in that: The limiting unit includes a screw rod parallel to the sliding shaft and cooperated with the fixed plate. A fixed plate is provided across the outer side of the rear of the multi-stage advancement unit. The screw rod passes through the fixed plate. Limiting nuts are provided on the outside of the screw rod on the front and rear sides of the fixed plate.

6. A paper container bottom forming mechanism according to claim 1, characterized in that: A vertical plate is fixedly provided between the shaft sleeve and the slide plate.

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