Bubble pressing machine preshrinking structure and bubble pressing machine

Abstract

The utility model discloses a preshrinking structure of a bubble pressing machine and the bubble pressing machine. The preshrinking structure of the bubble pressing machine comprises a first preshrinking roller, the second preshrinking roller is arranged on the first preshrinking roller through a swing positioning mechanism; under the limiting effect of the swing positioning mechanism, the second preshrinking roller can swing between a first position at least partially coinciding with the first preshrinking roller on the axial projection of the first preshrinking roller and a second position not coinciding with the first preshrinking roller on the axial projection of the first preshrinking roller and stop at any position. Under the action of the swing positioning mechanism, the second preshrinking roller can stay at the first position, so that stable preshrinking of paper is realized; when paper feeding operation needs to be carried out, only external force needs to be applied to the second preshrinking roller, the gravity of the second preshrinking roller and the force applied to the second preshrinking roller by the swing positioning mechanism need to be overcome, the second preshrinking roller moves and stays at the second position, paper can be fed easily under the condition of no resistance, and the paper feeding efficiency is improved; the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to packaging product processing equipment, in particular to a bubble pressing machine pre-shrinkage structure and a bubble pressing machine. Background Art

[0002] In express logistics, the items in the packaging box may include fragile items, such as ceramics, glass and other products. When transporting such items, cushioning materials are placed in the packaging box, or cushioning materials are wrapped around the items to play a role in cushioning, resisting shocks and vibrations, and reducing the risk of damage to the items.

[0003] The bubble press is a device that converts paper into cushioning material. It processes the paper through a set of forming rollers to produce a three-dimensional cushioning material with an uneven surface.

[0004] However, when the forming roller is processing the paper pad, the uneven surface of the forming roller will force the flat paper pad to deform directly, which may cause the paper to tear due to the deformation and tension, greatly reducing the cushioning effect of the finished paper pad.

[0005] In order to solve the problem that the paper pad is easily torn due to deformation and tension during the processing by the forming roller. At present, two parallel rods are set at the entrance of the bubble press, and multiple pressing wheels are set on the rods. The pressing wheels on the two rods are staggered in the width direction of the bubble press (that is, the feeding direction of the bubble press) (that is, the traditional pre-shrinkage structure), so that when the paper passes between the pressing wheels on the rods, the passage path formed by the paper is deformed by the pressing of the pressing wheels on the two rods, that is, the width of the paper is reduced. When the paper pad that has been deformed by the pressing wheels on the two rods at the entrance enters the forming roller for processing, the probability of tearing during the rolling process of the forming roller is greatly reduced due to the reduction in the width of the paper pad (pre-shrinkage), thereby improving the quality of paper output.

[0006] However, due to the setting of the pressing wheels, when feeding the paper into the entrance of the bubble press, the paper needs to pass between the pressing wheels on the two rods first. Since the pressing wheels are staggered, it is more troublesome to pass through, resulting in resistance in the process of feeding the paper between the pressing wheels on the two rods, which takes a long time and greatly reduces the efficiency of paper feeding. Utility Model Content

[0007] In order to solve the problem that the pressure wheels on the two rods of the traditional bubble press pre-shrinking structure are arranged in an interlaced manner, resulting in a large resistance when the paper passes through, resulting in low paper feeding efficiency, the inventor has modified the bubble press pre-shrinking structure. In the process of modifying the bubble press pre-shrinking structure, the inventor found that when one of the two rods in the pre-shrinking structure is set to be able to swing relative to the other, one of the rods can be swung relative to the other rod so that the projections of the pressure wheels on the two rods along the axial direction of the rod do not overlap, and the paper can easily enter between the pressure wheels on the two rods of the pre-shrinking structure without resistance, greatly improving the paper feeding efficiency. However, the inventor found that if the two rods in the pre-shrinking structure are simply set so that one of them can swing relative to the other, the pressure wheels on the two rods of the pre-shrinking structure will not be able to effectively squeeze the paper between the pressure wheels on the two rods, resulting in failure of paper pre-shrinking. In order to solve the problem of paper preshrinkage failure caused by one of the two rods of the preshrinkage structure being able to swing relative to the other rod, the inventors have come up with the idea of ​​introducing a swing positioning mechanism, so that when one of the two rods in the preshrinkage structure swings relative to the other rod, it can stay at any swing position, mainly to make the second preshrinkage roller under the limiting effect of the swing positioning mechanism, swing and stay at any position between a first position that at least partially overlaps with the first preshrinkage roller on the axial projection of the first preshrinkage roller and a second position that does not overlap with the first preshrinkage roller on the axial projection of the first preshrinkage roller, so that when the second preshrinkage roller is in the first position, the paper can be preshrinked; when the second preshrinkage roller is in the second position, the paper can easily enter between the pressing wheels on the two rods of the preshrinkage structure without resistance. Therefore, according to one aspect of the utility model, a bubble press preshrinkage structure is provided.

[0008] The pre-shrinking structure of the bubble press comprises a first pre-shrinking roller; a second pre-shrinking roller arranged on the first pre-shrinking roller by a swing positioning mechanism; the second pre-shrinking roller can swing between a first position and a second position under the limiting action of the swing positioning mechanism, and can stop the second pre-shrinking roller at any position between the first position and the second position relative to the first pre-shrinking roller; when the second pre-shrinking roller is in the first position, the projections of the first pre-shrinking roller and the second pre-shrinking roller on the axial direction of the first pre-shrinking roller at least partially overlap, so as to realize the pre-shrinking of paper when the first pre-shrinking roller and the second pre-shrinking roller rotate in opposite directions; when the second pre-shrinking roller is in the second position, the projections of the first pre-shrinking roller and the second pre-shrinking roller on the axial direction of the first pre-shrinking roller do not overlap.

[0009] Because the second preshrinking roller can stay in the first position under the action of the swing positioning mechanism, so as to realize the stable preshrinkage of the paper material; when the paper feeding operation is required, it is only necessary to apply an external force to the second preshrinking roller to overcome the gravity of the second preshrinking roller and the force applied to the second preshrinking roller by the swing positioning mechanism, so that the second preshrinking roller moves and stays in the second position, so that the paper material can be easily fed without resistance, and the situation that the paper material is broken due to resistance during the paper feeding process is avoided, thereby improving the paper feeding efficiency and reducing the production cost.

[0010] In some embodiments, the swing positioning mechanism includes a damping member capable of applying a damping force to the second preshrinking roller located at the second position so as to make the second preshrinking roller stay at any position between the first position and the second position relative to the first preshrinking roller. Since the swing positioning mechanism applies a damping force to the second preshrinking roller, the impact force applied by the second preshrinking roller to the paper can be reduced, so that the second preshrinking roller can interact with the first preshrinking roller to compress the paper, and the paper can be prevented from being broken due to excessive impact force applied to the paper.

[0011] In some embodiments, the swing positioning mechanism, in addition to comprising a damping member capable of applying a damping force to the second preshrinking roller located at the second position so that the second preshrinking roller stays at any position between the first position and the second position relative to the first position, further comprises: a fixed plate, a first end of which is rotatably disposed on the first preshrinking roller around the axis of the first preshrinking roller; a rotating plate, a first end of which is rotatably disposed on the second end of the fixed plate around a first rotating shaft parallel to the axis of the first preshrinking roller, and a second end of which is rotatably disposed on the second preshrinking roller around the axis of the second preshrinking roller.

[0012] Thus, the second preshrinking roller can be rotated about its axis relative to the rotating plate, so that the rotating plate rotates about the first rotating shaft relative to the fixed plate, and drives the fixed plate to rotate about the axis of the first preshrinking roller relative to the first preshrinking roller, so that the second preshrinking roller can swing stably relative to the first preshrinking roller.

[0013] In some embodiments, the damping member is an elastic damping member clamped between the fixed plate and the rotating plate, and the elastic damping member is sleeved on the first rotating shaft. Thus, the swing positioning mechanism can be simplified to achieve a concise and compact structure.

[0014] In some embodiments, the pre-shrinking structure of the bubble press further comprises a gasket on the basis of the elastic damping member, wherein the elastic damping member is a spring; the gasket is arranged between the spring and the fixing member, thereby ensuring the elastic force exerted by the spring on the rotating plate while preventing the spring from damaging the surface of the fixing member.

[0015] In some embodiments, a limiting structure is provided that can lock the second preshrinking roller in the second position and unlock the second preshrinking roller from the second position. Thus, the specific position of the second preshrinking roller in the second position can be clearly determined by the limiting structure, saving calibration time and improving operation efficiency; after paper loading is completed, the second preshrinking roller can be unlocked from the second position by the limiting structure, so that the second preshrinking roller can stay when returning to the first position under the action of the swing positioning mechanism to preshrink the paper.

[0016] In some embodiments, the limiting mechanism is a limiting groove provided on the fixed plate and adapted to the second preshrinking roller. Thus, by engaging the second preshrinking roller at the second position in the limiting groove, the second preshrinking roller can be locked at the second position, and when the second preshrinking roller needs to be unlocked from the second position, it is only necessary to remove the second preshrinking roller from the limiting groove, which is simple to operate and has a simple structure.

[0017] In some embodiments, the angle A between the line connecting the axes of the first preshrinking roller and the second preshrinking roller and the horizontal line ranges from 20° to 110°, and the second preshrinking roller is located above the first preshrinking roller; and when the angle A is 20°, the second preshrinking roller is located upstream of the first preshrinking roller.

[0018] Since the paper will gradually return to its original state after pre-shrinkage, the present application arranges the positions of the first pre-shrinkage roller and the second pre-shrinkage roller so that when the pre-shrinkage structure completes the pre-shrinkage of the paper and sends the paper to its downstream, the paper needs to first bypass the first pre-shrinkage roller, so that the first pre-shrinkage roller further shapes the paper, thereby enhancing the forming stability of the pre-shrinkage and reducing the degree of recovery of the paper when it is output to the downstream.

[0019] According to one aspect of the present invention, a bubble press is provided, which comprises: the aforementioned bubble press pre-shrinking structure; a frame; a first pre-shrinking roller in the bubble press pre-shrinking structure is rotatably arranged on the frame around its axis, so as to ensure stable compression of paper materials and improve paper loading efficiency, thereby saving production costs.

[0020] In some embodiments, the bubble press further comprises: a pair of forming rollers arranged downstream of the bubble press pre-shrinking structure, the forming rollers being rotatably arranged on the frame; and the action point of the bubble press pre-shrinking structure is located above the action point of the forming rollers.

[0021] The present application arranges the positions of the first preshrinking roller and the second preshrinking roller together with the position of the forming roller so that when the preshrinking structure completes the preshrinkage of the paper and sends the paper to the downstream forming roller, the paper needs to bypass the first preshrinking roller first, so that the first preshrinking roller further shapes the paper, thereby enhancing the preshrinkage forming stability, reducing the degree of recovery of the paper when it is output to the downstream, and avoiding the paper from breaking during forming due to recovery. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic structural diagram of a pre-shrinking structure of a bubble pressing machine according to an embodiment of the present utility model;

[0023] Figure 2 for Figure 1 A structural schematic diagram of the pre-shrinking structure of the bubble press shown in another perspective;

[0024] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure of the pre-shrinking structure of the bubble press along the MM direction;

[0025] Figure 4 for Figure 1 The schematic diagram of the structure of the bubble press pre-shrinking structure in the disassembled state is shown;

[0026] Figure 5 It is a cross-sectional structural schematic diagram of the second pre-shrinking roller of the pre-shrinking structure of the bubble pressing machine of the utility model being in the second position;

[0027] Figure 6 for Figure 1 An enlarged structural schematic diagram of location I of the pre-shrinking structure of the bubble press shown;

[0028] Figure 7 for Figure 2 The enlarged structural diagram of the II position of the pre-shrinking structure of the bubble press is shown;

[0029] Figure 8 This is a schematic structural diagram of a bubble pressing machine according to one embodiment of the utility model;

[0030] Fig. 9 for Figure 8 A schematic diagram of the cross-sectional structure of the bubble pressing machine along the NN direction;

[0031] Fig.10 for Figure 8 The enlarged structural diagram of the bubble pressing machine at position III is shown;

[0032] Figure numerals: 10, first pre-shrinking roller; 11, first rod body; 12, first pressure wheel; 20, second pre-shrinking roller; 21, second rod body; 22, second pressure wheel; 30, swing positioning mechanism; 31, spring piece; 32, fixed plate; 321, limiting groove; 33, rotating plate; 34, gasket; 35, screw; 36, nut; 100, frame; 40, forming roller. DETAILED DESCRIPTION

[0033] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0034] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include" and "comprise" include not only those elements, but also other elements that are not explicitly listed, or also include elements inherent to such processes, methods, articles or equipment. In the absence of further restrictions, the elements defined by the statement "include..." do not exclude the existence of other identical elements in the process, method, article or equipment that includes the elements. The terms used in this article are generally commonly used terms by those skilled in the art. If they are inconsistent with commonly used terms, the terms in this article shall prevail.

[0035] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] Figures 1 to 7 The figure schematically shows a pre-shrinking structure of a bubble pressing machine according to an embodiment of the utility model.

[0037] like Figure 5 As shown, the pre-shrinking structure of the bubble pressing machine includes a first rod body 11 , a first pressing wheel 12 , a second rod body 21 , a second pressing wheel 22 , a damping member, a fixed plate 32 , and a rotating plate 33 .

[0038] like Figure 1 and Figure 2As shown, the first pressing wheel 12 is coaxially sleeved on the first rod body 11 to form the first preshrinking roller 10. The second pressing wheel 22 is coaxially sleeved on the second rod body 21 to form the second preshrinking roller 20. At least one of the first pressing wheel 12 and the second pressing wheel 22 is provided with more than two, and the first pressing wheel 12 and the second pressing wheel 22 are staggered in the axial direction of the first preshrinking roller 10. In the present application, "the first pressing wheel 12 and the second pressing wheel 22 are staggered in the axial direction of the first preshrinking roller 10" means that when the first pressing wheel 12 and the second pressing wheel 22 are arranged in the axial direction of the first preshrinking roller 10, there is a situation where the second pressing wheel 22 is sandwiched between two first pressing wheels 12, or there is a situation where the first pressing wheel 12 is sandwiched between two second pressing wheels 22, but there is no situation where the first pressing wheel 12 and the second pressing wheel 22 overlap. For example, six first pressing wheels 12 are sleeved on the first rod body 11, and four second pressing wheels 22 are sleeved on the second rod body 21. At this time, a first pressing wheel 12 is sandwiched between two second pressing wheels 22, and a second pressing wheel 22 is not necessarily sandwiched between two first pressing wheels 12.

[0039] like Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, the first end of the fixed plate 32 is provided with a first through hole, so as to be sleeved on the first preshrinking roller 10, so that it can rotate around the axis of the first preshrinking roller 10. The second end of the fixed plate 32 is provided with a second through hole, and the first end of the rotating plate 33 is provided with a third through hole. The screw 35 passes through the second through hole and the third through hole, and the screw 35 (equivalent to the first rotating shaft) is parallel to the axis of the first preshrinking roller 10, so that the rotating plate 33 can be rotatably arranged on the second end of the fixed plate 32 around the first rotating shaft. In order to ensure that the screw 35 is stably installed on the fixed plate 32 and the rotating plate 33, the screw 35 is threadedly connected with the nut 36 after passing through the second through hole and the third through hole. The second end of the rotating plate 33 is provided with a fourth through hole, which is sleeved on the second preshrinking roller 20 so that it can rotate around the axis of the second preshrinking roller 20, and by selecting the positions of the first through hole, the second through hole, the third through hole and the fourth through hole, the second preshrinking roller 20 can swing between a first position at least partially overlapping with the first preshrinking roller 10 in the axial projection of the first preshrinking roller 10 and a second position not overlapping with the first preshrinking roller 10 in the axial projection of the first preshrinking roller 10. Figure 5As shown, a damping member is also sleeved on the screw 35, and the damping member is clamped between the fixed plate 32 and the rotating plate 33, so that the rotating plate 33 is subjected to the damping force applied by the damping member when rotating relative to the fixed plate 32, so that the rotating plate 33 can stay at any position during the rotation relative to the fixed plate 32, and then the second preshrinking roller 20 can stay at any position between the first position and the second position. The damping member can be, for example, an elastic damping member such as a spring 31, a disc spring, a spring, a rubber gasket, or a non-elastic damping member such as a nylon gasket, as long as the damping member can apply friction to the rotating plate 33 when the rotating plate 33 rotates relative to the fixed plate 32 around the first rotating axis, so that the rotating plate 33 can hover at any position when rotating relative to the fixed plate 32 around the first rotating axis. The fixed plate 32, the rotating plate 33, the damping member, and the screw 35 constitute a swing positioning mechanism 30 that can stop the second preshrinking roller 20 at any position between the first position and the second position relative to the first preshrinking roller 10.

[0040] like Figure 3 As shown, when the second preshrinking roller 20 is in the first position, the projections of the first preshrinking roller 10 and the second preshrinking roller 20 in the axial direction of the first preshrinking roller 10 at least partially overlap, so as to achieve preshrinkage of the paper when the first preshrinking roller 10 and the second preshrinking roller 20 rotate in opposite directions.

[0041] Specifically, when the second preshrinking roller 20 is in the first position, the projections of the first pressing wheel 12 and the second pressing wheel 22 in the axial direction of the first preshrinking roller 10 at least partially overlap. In order to achieve this partial overlap, it is only necessary to set the center distance between the first pressing wheel 12 and the second pressing wheel 22 to be smaller than the sum of the radius of the first pressing wheel 12 and the radius of the second pressing wheel 22. Of course, in order to avoid the interference of the first pressing wheel 12 and the second pressing wheel 22 with the first rod body 11 and the second rod body 21, the center distance between the first pressing wheel 12 and the second pressing wheel 22 is also set to be larger than the sum of the radius of the first rod body 11 and the second rod body 21. Of course, in order to achieve the preshrinking function of the preshrinking structure, the preshrinking structure of the present invention also adopts the conventional design of the prior art, and the present application does not make too many restrictions on this structure.

[0042] like Figure 4 As shown, when the second preshrinking roller 20 is in the second position, the projections of the first preshrinking roller 10 and the second preshrinking roller 20 in the axial direction of the first preshrinking roller 10 do not overlap, so that the paper material passes between the first preshrinking roller 10 and the second preshrinking roller 20 to achieve fast paper feeding.

[0043] Since the pre-compression structure of the bubble press of the present application is provided with a swing positioning mechanism 30, under the action of the swing positioning mechanism 30, the second pre-shrinking roller 20 can stay in the first position, and the paper path is restricted by the pressing wheels on the first pre-shrinking roller 10 and the second pre-shrinking roller 20, so that the paper is deformed to achieve stable pre-shrinkage of the paper; when the paper feeding operation is required, it is only necessary to apply an external force to the second pre-shrinking roller 20 to overcome the gravity of the second pre-shrinking roller 20 and the force applied to the second pre-shrinking roller 20 by the swing positioning mechanism 30, so that the second pre-shrinking roller 20 moves and stays in the second position, so that the paper can be easily fed without resistance, avoiding the situation that the paper is broken due to resistance during the paper feeding process, improving the paper feeding efficiency, reducing the production cost, and the equipment is small in size, highly integrated, and compact in structure. When the damping element is a spring sheet 31, since the swing positioning mechanism 30 applies elastic force to the second preshrinking roller 20, the force applied to the paper by the second preshrinking roller 20 on this basis can have a buffering effect, which can not only enable the second preshrinking roller 20 to interact with the first preshrinking roller 10 to compress the paper, but also avoid the paper from being broken due to excessive impact force applied to the paper; moreover, selecting the spring sheet 31 as the damping element can make the structure of the swing positioning mechanism 30 simple and compact while simplifying the swing positioning mechanism 30.

[0044] In some preferred embodiments, Figure 2 , Figure 5 and Figure 7 As shown, the swing positioning mechanism 30 further includes a gasket 34, which is arranged between the damping member and the fixing member. Thus, while ensuring the damping force applied by the damping member on the rotating plate 33, the damping member is prevented from damaging the surface of the fixing member.

[0045] In some preferred embodiments, Figure 1 , Figure 2 and Figure 5 As shown, the pre-shrinking structure of the bubble press is also provided with a limiting structure capable of locking the second pre-shrinking roller 20 in the second position and unlocking the second pre-shrinking roller 20 from the second position. In some embodiments, the limiting structure is a limiting groove 321 provided on the fixed plate 32 and adapted to the second pre-shrinking roller 20. Thus, the specific position of the second pre-shrinking roller 20 when in the second position can be clearly determined by means of the engagement of the limiting groove 321 with the second pre-shrinking roller 20, thereby saving the proofreading time and improving the operation efficiency; after the paper is loaded, the second pre-shrinking roller 20 is removed from the limiting groove 321 to unlock the second pre-shrinking roller 20 from the second position, so that the second pre-shrinking roller 20 can stay when returning to the first position under the action of the swing positioning mechanism 30 to pre-shrink the paper material, which is simple to operate and has a simple structure.

[0046] In some preferred embodiments, Figure 3As shown, the angle A between the line connecting the axes of the first preshrinking roller 10 and the second preshrinking roller 20 and the horizontal line ranges from 20° to 110°, and the second preshrinking roller 20 is located above the first preshrinking roller 10; and when the angle A is 20°, the second preshrinking roller 20 is located upstream of the first preshrinking roller 10. Preferably, the angle A is 40.6°±5°. Further preferably, the angle A is 40.6°. The present application sets the positions of the first preshrinking roller 10 and the second preshrinking roller 20 so that when the preshrinking structure completes the preshrinking of the paper and sends the paper to its downstream along the feeding direction X, the paper needs to bypass the first preshrinking roller 10 first, so that the first preshrinking roller 10 further has a shaping effect on the paper, thereby enhancing the preshrinking forming stability and reducing the degree of recovery of the paper output to the downstream.

[0047] Figures 8 to 10 A bubble pressing machine according to an embodiment of the utility model is schematically shown.

[0048] like Figure 8 and Fig.10 As shown, the bubble press comprises: the aforementioned bubble press pre-shrinking structure; a frame 100; and a first pre-shrinking roller 10 in the bubble press pre-shrinking structure is rotatably arranged on the frame 100 around its axis, so as to ensure stable compression of paper materials and improve paper feeding efficiency, thereby saving production costs.

[0049] In some preferred embodiments, Fig. 9 As shown, the bubble press further includes: a pair of forming rollers 40 arranged downstream of the bubble press pre-shrinking structure, the forming rollers 40 being rotatably arranged on the frame 100; the action point of the bubble press pre-shrinking structure is located above the action point of the forming rollers 40. Preferably, the angle B between the line connecting the action point of the bubble press pre-shrinking structure and the action point of the forming rollers 40 and the horizontal line is in the range of 13° to 60°. Preferably, the angle B between the line connecting the action point of the bubble press pre-shrinking structure and the action point of the forming rollers 40 and the horizontal line is 22°.

[0050] The present application arranges the positions of the first preshrinking roller 10 and the second preshrinking roller 20 with the position of the forming roller 40 so that when the preshrinking structure completes the preshrinkage of the paper and sends the paper to the downstream forming roller 40, the paper needs to bypass the first preshrinking roller 10 first, so that the first preshrinking roller 10 further shapes the paper, thereby enhancing the preshrinkage forming stability, reducing the degree of recovery of the paper output to the downstream, and avoiding the paper from breaking during forming due to recovery.

[0051] In the present invention, connection or installation is a fixed connection unless otherwise specified. Fixed connection can be realized as a detachable connection or a non-detachable connection commonly used in the prior art. The detachable connection can be realized by the prior art, such as threaded connection or key connection. The non-detachable connection can also be realized by the prior art, such as welding or gluing.

[0052] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. The pre-shrinking structure of the bubble pressing machine is characterized by: include: A first pre-shrinking roller; a second preshrinking roller disposed on the first preshrinking roller via a swing positioning mechanism; The second preshrinking roller can swing between the first position and the second position under the limiting action of the swing positioning mechanism, and can stop the second preshrinking roller at any position between the first position and the second position relative to the first preshrinking roller; When the second preshrinking roller is in the first position, the projections of the first preshrinking roller and the second preshrinking roller in the axial direction of the first preshrinking roller at least partially overlap, so as to achieve preshrinkage of the paper when the first preshrinking roller and the second preshrinking roller rotate in opposite directions; when the second preshrinking roller is in the second position, the projections of the first preshrinking roller and the second preshrinking roller in the axial direction of the first preshrinking roller do not overlap.

2. The pre-shrinking structure of the bubble press according to claim 1, characterized in that: The swing positioning mechanism comprises a damping member capable of applying a damping force to the second preshrinking roller so as to make the second preshrinking roller stay at any position between the first position and the second position relative to the first preshrinking roller.

3. The pre-shrinking structure of the bubble press according to claim 2, characterized in that: The swing positioning mechanism also includes: a fixed plate, a first end of which is rotatably disposed on the first preshrinking roller around the axis of the first preshrinking roller; The rotating plate has a first end which is rotatably disposed on the second end of the fixed plate around a first rotating shaft parallel to the axis of the first preshrinking roller, and a second end which is rotatably disposed on the second preshrinking roller around the axis of the second preshrinking roller.

4. The pre-shrinking structure of the bubble pressing machine according to claim 3, characterized in that: The damping member is an elastic damping member clamped between the fixed plate and the rotating plate, and the elastic damping member is sleeved on the first rotating shaft.

5. The pre-shrinking structure of the bubble pressing machine according to claim 4, characterized in that: The elastic damping member is a spring sheet; It also includes a gasket, which is arranged between the elastic sheet and the fixing member.

6. The pre-shrinking structure of the bubble press according to claim 3, characterized in that: A limiting structure is also provided, which can lock the second preshrinking roller at the second position and unlock the second preshrinking roller from the second position.

7. The pre-shrinking structure of the bubble press according to claim 6, characterized in that: The limiting structure is a limiting groove arranged on the fixing plate and adapted to the second preshrinking roller.

8. The pre-shrinking structure of a bubble press according to any one of claims 1 to 7, characterized in that: The value range of the angle A between the line connecting the axes of the first preshrinking roller and the second preshrinking roller and the horizontal line is 20° to 110°, and the second preshrinking roller is located above the first preshrinking roller; and when the angle A is 20°, the second preshrinking roller is located upstream of the first preshrinking roller.

9. Bubble pressing machine, characterized in that, include: The pre-shrinking structure of a bubble press according to any one of claims 1 to 8; The frame; the first pre-shrinking roller in the pre-shrinking structure of the bubble pressing machine is rotatably arranged on the frame around its axis.

10. The bubble pressing machine according to claim 9, characterized in that: Also includes: A pair of forming rollers disposed downstream of the pre-shrinking structure of the bubble press, the forming rollers being rotatably disposed on the frame; The action point of the pre-shrinking structure of the bubble press is located above the action point of the forming roller.

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