Manufacturing device and manufacturing method of double-layer tubular object

Abstract

The invention provides a manufacturing device and a manufacturing method of a double-layer tubular object. The device comprises a first slitting assembly, a second slitting assembly and a third slitting assembly, wherein the first slitting assembly is used for slitting an original strip into at least one wide strip and at least two narrow strips; the gluing assembly is used for coating glue on one strip surface of the wide strip or the narrow strip; the glue coating face of each wide strip and at least two adjacent narrow strips are bonded through the glue coating faces in the mode that the narrow strips are located on the same plane to form a bonding assembly of a double-layer bonding strip; the second slitting assembly is used for slitting the double-layer bonding strip into double-layer strips along gaps between the adjacent narrow strips; and the forming assembly is used for curling and forming the double-layer strip into a continuous double-layer tubular object of which the axial direction is parallel to the conveying direction. According to the device, the roundness and the hardness of the tubular object are effectively improved, the consumption of raw materials is reduced, two layers of materials for producing the double-layer tubular object are completely consistent, the product difference rate can be reduced, the product quality is improved, and meanwhile, the production efficiency can be multiplied through multi-channel parallel forming.

Description

Technical Field

[0001] The present invention relates to the technical field of hollow tubular object manufacturing, and in particular to a manufacturing device and a manufacturing method for a double-layer tubular object. Background Art

[0002] Currently, tubular materials used in the straw industry are generally round, with paper straws typically manufactured using a spiral winding process. In the heat-not-burn (HNB) cigarette market, tubular materials such as hollow paper tubes are often used to manufacture hollow filters or as smoke diffusers. Both types of tubular materials require a certain level of strength, hardness, and good roundness. Both types of tubular materials are mostly manufactured using a spiral winding process and then cut into specified lengths by a cutting assembly.

[0003] The spiral winding processing method and equipment have the following disadvantages: First, the speed of forming tubes is slow: The spiral winding process uses pre-slit and rewound paper discs, adjusting the angle of the coil to the desired tube diameter. This winding process is slower than linear forming. Furthermore, the paper tubes are cut using multiple sets of reciprocating cutters, and the reciprocating time further reduces the processing speed. Furthermore, spiral paper tube machines typically use wide, thick coils for feeding, making it impossible to replace the old and new discs online. Each raw material change requires machine downtime.

[0004] Second, the consumption of raw materials is large: spiral paper tubes are generally made of multiple layers of thickened paper, and glue needs to be applied between each two layers of paper tape, which consumes a large amount of glue. At the same time, the spiral winding method makes spirally wound paper tubes consume more paper than straight-line formed paper tubes of the same length.

[0005] Third, the paper tubes are of poor quality, have a strong odor, and are less safe for food: The thickness of the spiral paper tube machine depends on the thickness of the paper and the number of layers. If the pitch of two adjacent layers of paper coils is different, the seams of the two layers will often overlap during the continuous winding process, affecting the roundness of the paper tube. At the same time, due to the influence of multiple parameters in the winding process and the influence of the spiral structure itself, the small-walled paper tubes that are spirally wound often have an uneven surface and poor roundness and hardness. The large amount of glue used in the winding process also causes glue to leak from the edges of the paper tape, resulting in a large amount of residual glue on the inner and outer surfaces of the paper tube, which is difficult to avoid emitting a glue odor. At the same time, although the glue used is non-toxic, long-term contact may still have an impact on the human body, resulting in poor food safety.

[0006] Fourth, the device is complex: the spiral paper tube machine needs to slit and rewind the wide paper tape, and perform spiral winding and knife cutting. The structure of each functional component is relatively complex, which also leads to a large footprint. Summary of the Invention

[0007] In view of this, an embodiment of the present invention provides a manufacturing device and a manufacturing method for a double-layer tubular object, which are used to solve the problems of slow forming speed, large raw material consumption, and poor quality in the existing spiral winding forming method.

[0008] In a first aspect, an embodiment of the present disclosure provides a device for manufacturing a double-layer tubular object, comprising: a first slitting assembly for slitting an original strip into at least three strips, wherein the at least three strips include at least one wide strip and at least two narrow strips narrower than the wide strip, and the first slitting assembly is further configured to output the slit wide strips along a first plane and output the slit narrow strips along a second plane that does not overlap with the first plane; a gluing assembly, disposed downstream of the first slitting assembly, for applying glue on one surface of the wide strip or the narrow strip; a bonding assembly disposed downstream of the gluing assembly, for bonding each wide strip to at least two adjacent narrow strips via the glue-coated surface so that the narrow strips are in the same plane to form a double-layer bonded strip, with gaps between the bonded adjacent narrow strips; a second slitting assembly, which is arranged downstream of the bonding assembly and is used to slit the double-layer adhesive strip output by the bonding assembly along the gap between adjacent narrow strips to obtain at least two double-layer strips; N Each forming assembly is used to curl a double-layer strip into a continuous double-layer tubular object with its axis parallel to the conveying direction; wherein, N is equal to the total number of narrow strips cut by the first cutting assembly, N is a positive integer greater than 1.

[0009] In combination with the first aspect, in a first implementation manner of the first aspect, the manufacturing device further includes: a first translation assembly and / or a second translation assembly; A first translation assembly is disposed downstream of the first slitting assembly, and is used to translate the plurality of narrow strips along their width direction so that gaps of a predetermined width exist between adjacent narrow strips and the strip surfaces of adjacent narrow strips are output along a third plane; The second translation assembly is arranged downstream of the second slitting assembly, and is used to translate each double-layer strip output by the second slitting assembly along its width direction so that each double-layer strip is translated to the center position of a forming assembly entrance.

[0010] In combination with the first embodiment of the first aspect, in the second embodiment of the first aspect, the first slitting assembly slits the original strip in the width direction into nA group of strips, each group of strips comprising a first strip having a first width, a second strip having a second width, and a third strip having a third width; wherein the second width is greater than the first width and the third width; n is a positive integer, N =2 n ; The first translation component i The first and third strips in the group strips are translated along their width direction and then output; wherein, i =1,2,…, n ; The bonding assembly will i The center line of the gap between the first strip and the third strip in the group of strips translated by the first translation component and the center line of the gap between the first strip and the third strip i The width direction center line of the second strip in the group of strips is aligned perpendicular to the strip surface direction of the second strip, and the first strip is glued to the surface. i The first strip, the second strip and the third strip in the strip group are bonded to form a double-layer bonded strip with a herringbone-like structure in which the first strip and the second strip are on the same layer.

[0011] In combination with the second embodiment of the first aspect, in the third embodiment of the first aspect, the n =1, the first slitting assembly slits the original strip into the first strip, the second strip, and the third strip in sequence in the width direction of the original strip; the first width is equal to the third width, and the second width is equal to L 2 and the first width L 1 satisfies the relationship: L 2=2 L 1± l ,in, l is the preset difference.

[0012] In combination with the third embodiment of the first aspect, in a fourth embodiment of the first aspect, the second slitting assembly slits the double-layer adhesive strip of the quasi-P-shaped structure along the centerline of the gap between the first strip and the third strip to obtain a first double-layer strip consisting of the fourth strip and the first strip, and a second double-layer strip consisting of the fifth strip and the third strip; Wherein, the manufacturing device specifically includes a first molding component and a second molding component; The first forming assembly curls the left and right sides of the first double-layer strip upward / downward along the width direction thereof, so that the front end surface of the first double-layer strip is formed into a circle, the left and right sides of the fourth strip are opposite to each other, and the left and right sides of the first strip are opposite to each other; The second molding component curls the left and right sides of the second double-layer strip upward / downward along its width direction, so that the front end face of the second double-layer strip is formed into a circle, the left and right sides of the fifth strip are opposite, and the left and right sides of the third strip are opposite.

[0013] In combination with any one of the first aspect to the fourth embodiment of the first aspect, in a fifth embodiment of the first aspect, the gap width between adjacent narrow strips output by the first translation assembly is 2 mm to 8 mm.

[0014] In combination with the first aspect, in a sixth implementation of the first aspect, the widths of any two narrow strips are equal or unequal; The bonding components will enter the adjacent k A narrow strip is bonded to a wide strip, the width of which is greater than or equal to the adjacent k The sum of the widths of the narrow strips; where, k is a positive integer greater than or equal to 2.

[0015] In conjunction with the first aspect, in a seventh embodiment of the first aspect, the gluing assembly includes a glue supply component and a nozzle; the glue supply component is connected to the nozzle and supplies glue to the nozzle; the glue outlet of the nozzle has a preset shape, so that when the glue outlet applies glue to the tape surface of the wide strip, at least one glue-free area extending along the length direction of the wide strip is formed on the glue-coated surface of the wide strip; The bonding assembly aligns the center line of the gap between adjacent narrow strips inputted with the center line of the glue-free area on the wide strip inputted in a direction perpendicular to the strip surface of the wide strip, and bonds the narrow strips to the wide strip via the glue-coated surface; The second slitting assembly slits the double-layer adhesive strip along the glue-free area.

[0016] In combination with the first aspect, in an eighth embodiment of the first aspect, the first slitting assembly includes a first knife roller and a first conveying roller that rotate around their own axes; the roller surfaces of the first knife roller and the first conveying roller are arranged opposite to each other, and their axes are parallel to each other and transverse to the conveying direction of the original strip; the first knife roller is provided with a plurality of first rotating circular knives, and the roller surface of the first conveying roller is provided with a first annular cutting groove matching each first rotating circular knife or a first lower blade meshing with each first rotating circular knife in the circumferential direction of the roller surface; and / or The second slitting assembly includes a second knife roller and a second conveying roller that rotate around its own axis; the roller surfaces of the second knife roller and the second conveying roller are arranged opposite to each other, and the axes of the two are parallel to each other and transverse to the conveying direction of the original strip; the second knife roller is provided with a plurality of second rotating circular knives, and the roller surface of the second conveying roller is provided with a second annular cutting groove matching each second rotating circular knife or a second lower blade meshing with each second rotating circular knife in the circumferential direction.

[0017] In combination with the second embodiment of the first aspect, in a ninth embodiment of the first aspect, the first translation assembly includes at least one group of gathering roller assemblies, wherein the gathering roller assembly includes two first guide circular rollers installed at a certain angle and rotating around their own axes, and the axes of the two first guide circular rollers are lower in the middle and higher on both sides in a cross section perpendicular to the input direction of the first and third belts; and / or The second translation assembly includes at least one group of separation roller assemblies, and the separation roller assembly includes two second guide circular rollers installed at a certain angle and rotating around their own axes. The axes of the two second guide circular rollers are high in the middle and low on both sides in a cross section perpendicular to the input direction of the two double-layer strips.

[0018] In combination with the fourth implementation of the first aspect, in a tenth implementation of the first aspect, the belt surfaces of the first double-layer strip and the second double-layer strip are transported in parallel in the same direction along the center line of the length direction in the same fourth plane; The first forming assembly and the second forming assembly are arranged in a mirror image in a horizontal direction transverse to the conveying direction of the double-layer strip; Alternatively, the first forming assembly and the second forming assembly are arranged in a staggered manner front to back or arranged in parallel front to back in the conveying direction of the double-layer strip.

[0019] In combination with the first aspect, in an eleventh implementation of the first aspect, the manufacturing device further comprises: a strip material supply component and / or an auxiliary material strip material supply component and / or a cutting component, and a conveying component; The strip supply assembly is arranged upstream of the first slitting assembly and is used to unwind the coiled strip into raw strips and then continuously supply them to the first slitting assembly; The auxiliary material strip supply assembly is used to provide the forming assembly with auxiliary material strips as the inner lining and / or outer wrapping material of the double-layer tubular object; wherein the forming assembly is further used to introduce the auxiliary material strips and form the inner lining and / or outer wrapping of the double-layer tubular object with the auxiliary material strips in a specific shape or structure; The cutting assembly is arranged downstream of the forming assembly and is used to cut the continuous double-layer tubular product output by the forming assembly into tubular rods of a specified length; The conveying assembly is arranged downstream of the cutting assembly and is used to arrange and output the tubular rods output by the cutting assembly in an orderly manner.

[0020] In a second aspect, an embodiment of the present invention provides a method for manufacturing a double-layer tubular object, the method comprising the following steps: S10: slitting the original strip into at least one wide strip and at least two narrow strips narrower than the wide strip, and outputting the slitting wide strip along a first plane, and outputting the slitting narrow strips along a second plane that does not overlap with the first plane; S20: applying glue on one surface of the wide strip or the narrow strip; S30: bonding the glue-coated surface of each wide strip to at least two adjacent narrow strips via the glue-coated surface so that the narrow strips are in the same plane to form a double-layer bonded strip, with a gap between the bonded adjacent narrow strips; S40: cutting the double-layer adhesive strip along the gap between adjacent narrow strips to obtain at least two double-layer strips; S50: The at least two double-layer strips are simultaneously rolled and formed into continuous double-layer tubular objects whose axes are parallel to the conveying direction.

[0021] In conjunction with the second aspect, in a first implementation of the second aspect, after S10 and before S30, the method further includes the steps of: S21: translating the plurality of narrow strips along their width direction so that there is a gap of a predetermined width between adjacent narrow strips and the strip surfaces of adjacent narrow strips are output along a third plane.

[0022] In combination with the first implementation of the second aspect, in a second implementation of the second aspect, after S40 and before S50, the method further includes the steps of: S41: translating the at least two double-layer strips along their width direction, so that each double-layer strip is translated to the center position of the inlet of the forming assembly for curling and forming the double-layer strip.

[0023] In combination with the first embodiment of the second aspect, in the third embodiment of the second aspect, the slitting of the original strip into at least one wide strip and at least two narrow strips narrower than the wide strip in S10 includes: slitting the original strip into at least one wide strip and at least two narrow strips narrower than the wide strip in the width direction of the original strip. n A group of strips, each group of strips comprising a first strip having a first width, a second strip having a second width, and a third strip having a third width; wherein the second width is greater than the first width and the third width; n is a positive integer; The S21 includes: iThe first and third strips in the strip group are translated along their width direction to a gap with a predetermined width between them, and the translated third strip is i The strip surfaces of the first strip and the third strip in the strip group are output along the third plane; wherein, i =1,2,…, n ; The S30 includes: i The center line of the gap between the first strip and the third strip in the group of strips output by the S21 translation is i The width direction center line of the second strip after the glue coating in the S20 is aligned perpendicular to the strip surface direction of the second strip, and the first strip is glued to the surface of the second strip. i The first strip, the second strip and the third strip in the strip group are bonded to form a double-layer bonded strip with a herringbone-like structure in which the first strip and the second strip are on the same layer.

[0024] In combination with any one of the second aspect to the third embodiment of the second aspect, in a fourth embodiment of the second aspect, before S10, the method further includes the steps of: S00: Uncoiling the coiled strip into the original strip and then continuously conveying it; And / or before S50, the method further includes the steps of: S42: introducing auxiliary material strips as the inner lining and / or outer wrapping material of the tubular object; The S50 further includes: while curling the double-layer strip into a double-layer tubular object, forming an inner lining of the double-layer tubular object and / or wrapping the outer surface of the double-layer tubular object with the auxiliary material strip in a specific shape or structure; And / or after S50, the method further includes the steps of: S60: cutting the continuous double-layer tubular object into tubular rods of a specified length; S70: Arrange the tubular rods in an orderly manner and output them.

[0025] The manufacturing device and method for the double-layer tubular object provided by the present invention cut the original strip into at least one wide strip and at least two narrow strips, then apply glue to the wide strip, bond multiple narrow strips to one wide strip to obtain a double-layer bonded strip, and then cut the double-layer bonded strip into multiple double-layer strips along the gaps between adjacent narrow strips. Finally, each double-layer strip is directly longitudinally formed into a double-layer tubular object. On the one hand, this device avoids the problem of uneven surface of the tubular object caused by the spiral winding free forming process. At the same time, the once-formed tubular object also has a high roundness, effectively improving the appearance and roundness quality of the tubular object. On the other hand, only one side of the strip of the produced double-layer tubular object is coated with glue. Compared with the spiral winding forming method where glue needs to be coated between every two layers of strips, the amount of glue used is reduced, improving food safety while reducing the peculiar smell brought by the glue. On the other hand, by bonding multiple narrow strips from the same original strip to one wide strip and then cutting them into multiple double-layer strips, it can ensure that the two layers of materials used for producing the double-layer tubular object are completely the same at the same time, facilitating the control of the glue and processing technology used, reducing the product difference rate, and improving product quality. In addition, multiple double-layer strips of the same material are simultaneously formed in multiple channels in parallel on the conveyor line through multiple forming components. Compared with the technology where only one paper tube can be produced on a single production line, the production efficiency can be increased several times, the production speed can be greatly increased, continuous industrial production can be achieved, and the production cost can be reduced at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 FIG. 9 is a schematic structural diagram of Embodiment 1 of the manufacturing device for a double-layer tubular object of the present invention; Figure 2 FIG. 12 is a schematic structural diagram of Embodiment 2 of the manufacturing device for a double-layer tubular object of the present invention; Figure 3 FIG. 15 is a schematic structural diagram of the first cutting component provided by the present invention; Figure 4 FIG. 18 is a schematic structural diagram of a double-layer bonded paper tape in a character-like structure output by the bonding component of the present invention; Figure 5 FIG. 21 is a schematic structural diagram of Embodiment 3 of the manufacturing device for a double-layer tubular object of the present invention; Figure 6 FIG. 24 is a schematic diagram of the glue application component of the present invention applying glue to the second strip; Figure 7 is a schematic structural diagram of the first translation assembly of the present invention; Figure 8 It is a structural schematic diagram of the bonding assembly of the present invention; Figure 9 2. It is a schematic structural diagram of the second slitting assembly and the second translation assembly of the present invention; Figure 10 is a schematic cross-sectional view of a first molding assembly of the present invention; Figure 11 is a flow chart of a method for manufacturing a double-layer tubular object of the present invention; Reference numerals: 1. Strip supply assembly; 2. First slitting assembly; 3. Gluing assembly; 4. First translation assembly; 5. Adhesive assembly; 6. Second slitting assembly; 7. Second translation assembly; 8. Tension control assembly; 9. First forming assembly; 10. Second forming assembly; 11. Cutting assembly; 12. Conveying assembly; 13. First auxiliary material strip supply assembly; 14. Second auxiliary material strip supply assembly; 101. Coiled strip; 102. Strip splicing device; 121. Adhesive layer 201, first paper tape stopper; 202, first pressing roller; 203, first conveying roller; 204, first knife roller; 205, first rotating circular knife; 206, second paper tape stopper; 302, plate-type slit nozzle; 401, third paper tape stopper; 402, gathering roller assembly; 403, fourth paper tape stopper; 501, third pressing roller; 502, bonding bottom roller; 503, strip deviation corrector; 601, second pressing roller; 602, second conveying roller; 603, second knife roller; 604, second rotating circular knife; 701, separation roller assembly; 901, base; 903, first side forming block; 904, second side forming block; 905, core rod; P, original strip; P11, first strip; P12, second strip; P13, third strip; P2, double-layer adhesive strip; P21, first double-layer strip; P22, second double-layer strip; G1, first double-layer tubular object; G2, second double-layer tubular object; A. The centerline of the gap between the first strip P12 and the third strip P13; B. The centerline of the width direction of the second strip P12; a , the width of the first strip P11 and the third strip P13; b , the width of the second strip P12; c , the width of the double-layer adhesive strip P2; d, the width of the first double-layer strip P21 and the second double-layer strip P22; J1~J2, the glue area; W, the glue-free area. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0029] Figure 1 FIG. 1 is a schematic structural diagram of a device for manufacturing a double-layer tubular object provided by an embodiment of the present invention. Figure 1 As shown in FIG, the manufacturing device includes: a first slitting assembly 2, a gluing assembly 3, a bonding assembly 5, a second slitting assembly 6 and N A molded component; wherein: The first slitting assembly 2 is used to slit the original strip into at least three strips, among which there is at least one wide strip and at least two narrow strips that are narrower than the wide strip. The first slitting assembly 2 is also used to output the slit wide strips along a first plane and output the slit narrow strips along a second plane that does not overlap with the first plane.

[0030] The gluing assembly 3 is arranged downstream of the first slitting assembly 2 and is used to apply glue on one surface of the wide strip or the narrow strip.

[0031] The bonding component 5 is arranged downstream of the gluing component 3 and is used to bond each wide strip to at least two adjacent narrow strips through the glue coating surface in a manner that the narrow strips are in the same plane to form a double-layer bonding strip, and there is a gap between the bonded adjacent narrow strips. For example, the bonding component 5 can bond two narrow strips to one wide strip to obtain a double-layer bonding strip with a herringbone structure, or, when the width of the original strip is wide enough, the first slitting component can also cut out more narrow strips, and can bond 3 or 4 or more narrow strips to one wide strip, or, when the width of the original strip is wide enough, the first slitting component can also cut out k wide strips and 2k narrow strips, and the narrow strip-wide strip-narrow strip is a combination. According to the above combination, 2k narrow strips can be bonded to k wide strips, which will not be repeated here. When bonding multiple narrow strips to wide strips, the narrow strips do not overlap with each other and there is a gap between them.

[0032] The second slitting assembly 6 is arranged downstream of the bonding assembly 5 and is used to slit the double-layer adhesive strip output by the bonding assembly 5 along the gap between adjacent narrow strips to obtain at least two double-layer strips.

[0033] Each forming assembly is used to curl a double-layer strip into a continuous double-layer tubular object with its axis parallel to the conveying direction; wherein, N Equal to the total number of narrow strips cut by the first cutting component 2, N is a positive integer greater than 1.

[0034] The apparatus for manufacturing double-layer tubular articles provided by the present invention utilizes a first slitting assembly 2 to slit a raw strip into at least one wide strip and at least two narrow strips. A gluing assembly 3 then applies glue to the wide strip. A bonding assembly 5 bonds multiple narrow strips to a wide strip to form a double-layer adhesive strip. A second slitting assembly 6 then cuts the double-layer adhesive strip into multiple double-layer strips along the gaps between adjacent narrow strips. Finally, a forming assembly directly forms each double-layer strip longitudinally into a double-layer tubular article. This apparatus avoids the uneven surface of the tubular article caused by the spiral winding free-form process. Furthermore, the single-step forming process by the forming assembly also ensures a high degree of roundness, effectively improving the appearance and roundness of the tubular article. Furthermore, only one side of the double-layer tubular article is glued. Compared to the spiral winding method, which requires glue to be applied between each two layers of the strip, this method reduces glue usage, improves food safety, and reduces the odor associated with glue.

[0035] On the other hand, because bonding materials of different properties places high demands on the glue properties (viscosity, moisture content, etc.) and processing techniques (such as the conveying speed of the strip during bonding and the control of the glue temperature), it is difficult to ensure that the different layers of paper used in the production of paper tubes at the same time are completely consistent. Therefore, it is difficult to control the glue and processing technology used, and the output product variability is also large. The embodiments of the present invention, by bonding multiple narrow strips from the same raw material to a single wide strip and then slitting them into multiple double-layer strips, can ensure that the two layers of material used in the production of double-layer tubes at the same time are completely consistent, facilitating the control of the glue and processing technology used, reducing product variability, and improving product quality. Furthermore, after the secondary slitting, multiple double-layer strips of the same material are formed simultaneously on a conveyor line through multiple forming assemblies, which can greatly improve production efficiency compared to technologies that can only produce one paper tube on a single production line.

[0036] In some optional embodiments, in order to more accurately control the transverse size (width) of the double-layer adhesive strip output by the adhesive assembly and the diameter of the double-layer tubular object finally produced, as shown in FIG. Figure 2As shown, the apparatus for manufacturing double-layer tubular articles provided by the present invention further includes a first translation assembly 4, disposed downstream of the first slitting assembly 2, for translating the plurality of narrow strips along their widths so that gaps of a predetermined width exist between adjacent narrow strips and the strips are delivered along a third plane. In some embodiments, the first translation assembly 4 adjusts the predetermined width of the gaps between adjacent narrow strips to be between 2 mm and 8 mm, preferably between 4 and 6 mm.

[0037] At the same time, in order to make the double-layer strips output by the second slitting assembly 6 smoothly enter the forming assembly for forming, as shown in FIG. Figure 2 As shown, the apparatus for manufacturing double-layer tubular articles provided by the present invention further includes a second translation assembly 7, disposed downstream of the second slitting assembly 6 and upstream of the forming assembly. The second translation assembly 7 is configured to translate each double-layer strip outputted by the second slitting assembly 6 along its width, so that each double-layer strip is translated to the center of an inlet of a forming assembly. For example, the second translation assembly 7 can translate multiple double-layer strips inputted along their width, thereby staggering the output of the multiple double-layer strips so as to connect to the inlets of multiple forming assemblies that are staggered in the width direction.

[0038] In some optional embodiments, the widths of any two narrow strips obtained by slitting by the first slitting assembly 2 are equal or unequal, thereby meeting the production requirements of double-layer tubular objects with the same or different diameters.

[0039] In some optional embodiments, the bonding component 5 will input adjacent k A narrow strip is bonded to a wide strip, the width of which is greater than or equal to the adjacent k The sum of the widths of the narrow strips; where, k is a positive integer greater than or equal to 2.

[0040] In the preferred embodiment of the present invention, the first slitting assembly 2 slits the original strip into n A group of strips, each group of strips includes a first strip having a first width, a second strip having a second width, and a third strip having a third width; wherein the second width is greater than the first width and the third width; wherein, n is a positive integer, N =2 n In these embodiments, the first translation assembly 4 moves the i The center lines of the first and third strips in the group strips are translated horizontally and then output; i =1,2,…, n ; Adhesive component 5 will be the first i The center line of the gap between the first strip and the third strip in the group of strips translated by the first translation component 4 and the center line of the gap between the first strip and the third strip iThe width direction center line of the second strip in the group of strips is aligned perpendicular to the strip surface direction of the second strip, and the first strip is glued to the surface. i The first strip, the second strip and the third strip in the group of strips are bonded to form a double-layer bonded strip with a similar Chinese-character structure. In the double-layer bonded strip with the similar Chinese-character structure, the first strip and the second strip are in the same layer.

[0041] Preferably, if Figure 3 As shown, the first slitting assembly 2 slits the original strip P into three strips in the width direction, which are respectively L 1= a The first strip P11 has a second width L 2= b The second strip P12 has a third width L 3= a The third strip P13. Among them, the first width L 1 equals the third width L 3. Second width L 2 and the first width L 1 satisfies the relationship: L 2=2 L 1± l ,in, l is a preset difference. Preferably, the second width is 2.01 to 2.3 times the first width. Figure 4 As described above, the bonding component 5 aligns the gap center line A of the first strip P11 and the third strip P13 with the width direction center line B of the second strip P12 in a direction perpendicular to the strip surface of the second strip P12, and brings the aligned second strip P12 coated with the adhesive layer 121 into contact with the opposite strip surfaces of the first strip P11 and the third strip P13, thereby bonding the first strip P11, the second strip P12, and the third strip P13 through the glue coated surface as shown. Figure 4 The double-layer adhesive strip with a similar Chinese-shaped structure shown in FIG.

[0042] In this embodiment of the present invention, the number of wide and narrow strips that can be cut by the first slitting assembly 2 and their respective combinations during bonding in the bonding assembly 5 are predetermined based on the width of the original strip material and the diameter of the desired double-layer tubular article. The various combinations of wide and narrow strips are not detailed here. During the initial design, once the combinations of wide and narrow strips are determined, the number of cutting heads for the first slitting assembly 2 and the second slitting assembly 6 can be designed, the number of forming assemblies can be determined, and the specific structures of the first and second translation assemblies 4 and 7 can be determined.

[0043] In some embodiments, when the first slitting assembly 2 has the function of slitting the original strip P into strips having a first width L 1, having a first strip of a second widthL the second strip of 2 and having a first width L When forming the structure of the third strip of 1, the second slitting component 6 slits the double-layer adhesive strip in a structure similar to a Chinese character 'pin' formed by bonding the first strip, the second strip, and the third strip along the center line of the gap between the first strip and the third strip. The second strip is slit into a fourth strip and a fifth strip, obtaining a first double-layer strip composed of the fourth strip and the first strip and a second double-layer strip composed of the fifth strip and the third strip. In this embodiment, the manufacturing device of the present invention specifically includes a first forming component and a second forming component. Among them, the first forming component curls the left and right side surfaces of the first double-layer strip upward / downward along its conveying direction, forming the front end surface of the first double-layer strip into a circular shape, with the left and right side surfaces of the fourth strip facing each other and the left and right side surfaces of the first strip facing each other. The second forming component curls the left and right side surfaces of the second double-layer strip upward / downward along its conveying direction, forming the front end surface of the second double-layer strip into a circular shape, with the left and right side surfaces of the fifth strip facing each other and the left and right side surfaces of the third strip facing each other. Preferably, during the curling forming, the left and right side surfaces of each layer of the strip face each other but have a certain gap (for example, 0 to 1 mm), which can accommodate the glue extruded between the two layers of the double-layer strip during curling. On the one hand, it avoids the glue overflowing outside, and on the other hand, the glue in this gap can bond the left and right side surfaces of the strip, avoiding warping.

[0044] To facilitate the understanding of the present invention, the following takes the first slitting component 2 slitting the original strip in the width direction into a first strip with a first width, a second strip with a second width, and a third strip with a third width as an example, and specifically describes the manufacturing device of the double-layer tubular object provided by the embodiment of the present invention in combination with the attached drawings.

[0045] Figure 5 is a schematic structural diagram of the third embodiment of the manufacturing device of a double-layer tubular object of the present invention. As Figure 5 shown in the figure, the original strip P is slit by the first slitting component 2 into a first strip P11 with a first width L 1 = a a second strip P12 with a second width L 2 = b and a third strip P13 with a first width L 1. After that, the first strip P11 and the third strip P13 are conveyed to the right along the horizontal second plane, and after being translated and gathered along their width directions by the first translation component 4, they are finally output vertically upward. After the second strip P12 is output vertically upward by the first slitting component 2 and coated with glue on its lower surface by the gluing component 3, it is output to the right. Subsequently, the bonding component 5 bonds the first strip P11 and the third strip P13 on the lower surface of the second strip P12, forming as Figure 4The double-layer adhesive strip P2 of the similar Chinese character structure shown in the figure is outputted obliquely to the right and downward; the second slitting component 6 cuts the double-layer adhesive strip P2 of the similar Chinese character structure into the first double-layer strip P21 and the second double-layer strip P22 for output; the second translation component 7 separates the first double-layer strip P21 and the second double-layer strip P22 by steering the steering roller and the separation component along the width direction; and then enters the tension control component 8 after being turned by the steering roller group to maintain tension balance to prevent the paper tape from being torn due to excessive tension or being stretched. The force is too small and the strip relaxes, and then the first double-layer strip P21 and the second double-layer strip P2 are output horizontally to the left. The first double-layer strip P21 first reaches the center position of the entrance of the first forming component 9, and the second double-layer strip P22 reaches the center position of the entrance of the second forming component 10 downstream. The first double-layer strip P21 and the second double-layer strip P22 are respectively formed into tubular objects in the first forming component 9 and the second forming component 10 to form "infinitely long" first double-layer tubular object G1 and second double-layer tubular object G2 for output.

[0046] In some optional embodiments, such as Figure 5 As shown in the figure, the manufacturing device of the double-layer tubular article provided by the embodiment of the present invention further includes: a strip supply assembly 1, which is arranged upstream of the first slitting assembly 2 and is used to unwind the coiled strip 101 into the original strip P and then continuously supply it to the first slitting assembly 2. Figure 5 As shown in the figure, the strip supply assembly 1 has a rotatable circulation disk and a strip splicing device 102, on which new and old rolls of strip and a number of guide rollers are installed. The old roll of strip in use is guided by the guide rollers and passes through the strip splicing device 102 and then introduced into the first slitting assembly 2 through multiple guide rollers. The head end of the new roll of strip is guided into the strip splicing device 102. The strip splicing device 102 is used to automatically splice the head end of the new strip to the tail end of the old strip when the old roll of strip is about to be used up.

[0047] In some embodiments, the first slitting assembly 2 provided by the present invention includes a first knife roller and a first conveying roller that rotate around their own axis; the roller surfaces of the first knife roller and the first conveying roller are arranged opposite to each other, and the axes of the two are parallel to each other and transverse to the conveying direction of the original strip; the first knife roller includes ( N + M -1) a first rotating circular knife, the roller surface of the first conveying roller is provided with a first annular cutting groove matching each first rotating circular knife or a first blade meshing with each first rotating circular knife in the circumferential direction; wherein, M Equal to the total number of wide strips cut by the first cutting component 2, N is equal to the total number of narrow strips cut by the first cutting assembly, N, M Is a positive integer.

[0048] In the embodiment of the present invention, Figure 3 and Figure 5As shown in , the first slitting assembly 2 includes a first paper tape stopper 201, a first pressure roller 202, a first conveyor roller 203, a first knife roller 204, and a second paper tape stopper 206. Two first rotating circular knives 205 are installed on the first knife roller 204. In the embodiment of the present invention, after passing through the first paper tape stopper 201, the original strip P maintains its horizontal position (in the width direction of the original strip P) and passes between the first conveyor roller 203 and the first knife roller 204. By locking the first pressure roller 202, the original strip P is pressed and pressed against the first conveyor roller 203. After the original strip P forms a certain wrap angle with the first conveyor roller 203, it is cut into strips having a first width along the longitudinal direction of the original strip P by the two first rotating circular knives 205 on the first knife roller 204. a The first strip P11 has a second width b The second strip P12 has a first width a The third strip P13 is used to realize the slitting of the original strip P.

[0049] In some embodiments, the first pressing roller 202 may be driven by a motor or a cylinder, or may even be manually locked, depending on the actual space limitations of the equipment.

[0050] In some embodiments, the first pressure roller 202 in the first slitting assembly 2 may also include a first pressure roller rotating shaft, a first pressure roller surface, a first pressure roller connecting device, and a first locking assembly not shown in the figure. The position of the first pressure roller is adjusted manually or automatically and locked or unlocked to achieve the pressing of the original strip P on the first conveying roller 203.

[0051] In some embodiments, the first conveyor roller 203 may also include a first conveyor roller power assembly, a first conveyor roller rotating shaft, and a first conveyor roller connecting device not shown in the figure. The first conveyor roller 203 is connected to the first conveyor roller power assembly through the first conveyor roller rotating shaft and the first conveyor roller connecting device. The first conveyor roller power assembly synchronously tracks the production speed of the equipment and adaptively drives the first conveyor roller rotating shaft to rotate, cooperating with the first pressure roller 202 to realize the traction and conveying of the original strip P.

[0052] In some embodiments, the first cutter roller 204 may further include a first cutter roller power assembly (not shown), a first circular blade rotating shaft, a first cutter roller eccentric bearing seat, and a first cutter roller connecting device. The first rotating circular blade 205 is mounted on the first circular blade rotating shaft and fixed to the first cutter roller 204 via the first cutter roller connecting device. The first circular blade rotating shaft is connected to the first cutter roller power assembly. The first cutter roller power assembly drives the two first rotating circular blades 205 to rotate rapidly. The first cutter roller eccentric bearing seat rotates manually or by a motor / cylinder, driving the first circular blade rotating shaft mounted within the first cutter roller eccentric bearing seat to move eccentrically, thereby controlling the first rotating circular blade 205 to enter or exit the blade slot of the first conveyor roller 203 during the rotation of the first circular blade rotating shaft. The first rotating circular blade 205 cuts the original strip P into three strips. The first strip P11 and the third strip P13 are restrained in the transverse direction (the width direction of the strips) by the second paper tape stopper 206 to prevent the strips from deviating, thereby achieving a single, precise slitting of the original strip P. Alternatively, the first conveyor roller 203 is equipped with a first lower blade that can rotate without power. After the first knife roller 204 is in contact with the first conveyor roller 203, the two first rotating circular knives 205 on the first knife roller 204 are engaged with the two first lower blades on the first conveyor roller 203 to form a shearing form similar to scissors, thereby completing the cutting of the original strip P.

[0053] In some optional embodiments, the gluing component 3 includes a glue supply component and a nozzle; the glue supply component is connected to the nozzle and supplies glue to the nozzle. When a narrow strip needs to be glued, the nozzle coats one surface of the narrow strip with glue to form a glue-coated surface; or, when a wide strip needs to be glued, the nozzle coats one surface of the wide strip with glue to form a glue-coated surface; or, when a wide strip needs to be glued, the glue outlet of the nozzle has a preset shape so that when the glue outlet coats the surface of the wide strip with glue, at least one glue-free area extending along the length direction of the wide strip is formed on the glue-coated surface of the wide strip (the number of glue-free areas can be equal to the number of narrow strips that the wide strip needs to bond with minus 1). For example Figure 6 As shown in FIG, the nozzle of the gluing assembly 3 is a plate-type slit nozzle 302. After the plate-type slit nozzle 302 applies glue to the second strip P12, the glue-coated surface of the second strip P12 forms glued areas J1 and J2 and a glue-free area W extending along the length of the second strip P12. The glue-free area W is located between the glued areas J1 and J2. In this way, the bonding assembly 5 aligns the centerline of the gap between adjacent narrow strips with the centerline of the glue-free area on the input wide strip, perpendicular to the strip surface. The first and third strips P11 and P13 are bonded to the wide strip via the glue-coated surface. The second slitting assembly 6 then slits the double-layered adhesive strip along the glue-free areas.

[0054] Preferably, the width of the glue-free area is 0.5 mm to 1.0 mm.

[0055] According to an embodiment of the present invention, a plate-type slit nozzle can be installed on a glue roller, and glue enters the glue roller through the glue supply component and finally flows out through the slit nozzle. When gluing is required, the glue roller is rotated so that the glue outlet of the slit nozzle is turned to a position close to the surface of the second strip P12, and the quantitative coating of glue is completed during the transportation of the second strip P12. When gluing needs to be stopped, the glue roller is rotated so that the glue outlet of the slit nozzle is turned to a position away from the second strip P12. In some embodiments, the glue roller may not be cylindrical, but may be irregularly shaped. The nozzle may not use a slit nozzle but an atomizing nozzle or other types of nozzles. When using an atomizing nozzle, the second strip P12 may not be in contact with the nozzle. The specific setting is based on production needs and will not be repeated here.

[0056] In some optional embodiments, such as Figure 7 As shown in , the first translation assembly 4 includes at least one group of gathering roller assemblies 402. The gathering roller assembly 402 includes two first guide rollers installed at a certain angle and rotating around their own axes. The axes of the two first guide rollers are low in the middle and high on both sides in a cross section perpendicular to the input direction of the first strip P11 and the third strip P13. After the first strip P11 and the third strip P13 pass through the two guide rollers on the gathering roller assembly 402, since the axes of the two first guide rollers are not parallel to the conveyed strips, the internal tension of the strips changes under their action, and the first strip P11 and the third strip P13 will be translated and gathered in their width direction. Preferably, when the input first strip P11 and the third strip P13 are relatively far apart in their width direction and a larger translation and gathering distance is required, multiple groups of gathering assemblies 402 can also be arranged in the strip conveying direction to gather the first strip P11 and the third strip P13 in stages, thereby reducing the amount of deformation when the strips are gathered each time.

[0057] Preferably, the first translation component 4 also includes a third paper tape limiter 401 and a fourth paper tape limiter 403. The third paper tape limiter 401 is used to limit the lateral position of the input first tape P11 and the third tape P13 to ensure that the first tape P11 and the third tape P13 are smoothly conveyed to the two first guide circular rollers of the gathering roller assembly 402 respectively; after the first tape P11 and the third tape P13 are translated to the specified position by the gathering roller assembly 402, the first tape P11 and the third tape P13 are kept in a fixed lateral position and output after passing through the fourth paper tape limiter 403 to accurately connect with the narrow strip entrance position of the adhesive component 5.

[0058] In some embodiments, the gathering roller assembly 402 may also Figure 7The two guide circular rollers arranged on the left and right sides are replaced by a guide assembly comprising a concave wheel assembly and a convex wheel assembly, as described in Chinese patent CN 202210957396.3, which will not be repeated here.

[0059] Figure 8 Schematic diagram of the structure of the bonding assembly of the present invention, as shown in Figure 8 As shown in FIG, the bonding assembly 5 includes a third pressure roller 501, a bonding bottom roller 502, a fifth paper tape stopper, and a sixth paper tape stopper; wherein, the roller surfaces of the third pressure roller 501 and the bonding bottom roller 502 are arranged opposite to each other, and their axes are parallel to each other and transverse to the conveying direction of the narrow strips (the first strip P11 and the third strip P13) (along the width direction of the narrow strips); the spacing between the bonding bottom roller and the third pressure roller is set so that when the wide strip and the narrow strip pass through, the tape surfaces of the wide and narrow strips come into contact and are bonded to form a double-layer adhesive strip. For example Figure 8 As shown in the figure, the first strip P11 and the third strip P13 are transported closely to the bonding bottom roller 502, the wide strip (the second strip P12) is located between the third pressure roller and the narrow strip, and the glue-coated surface of the wide strip faces the narrow strip. The second strip P12 is located in the center above the first strip P11 and the third strip P13. The spacing between the bonding bottom roller 502 and the third pressure roller 501 is set so that when the first strip P11, the second strip P12 and the third strip P13 pass through, the upper glue surface of the second strip P12 contacts the first strip P11 and the third strip P13. The pressure roller 501 presses the three strips to complete the double-layer strip bonding, forming as shown in the figure. Figure 4 The width shown in c The fifth and sixth paper tape stoppers are located upstream and downstream of the bonding roller, respectively, along the conveying direction of the narrow strip. The fifth paper tape stopper is used to limit the width of the input narrow strip, thereby limiting the position of the input narrow strip relative to the input wide strip, preventing the relative positions of the three strips from changing during bonding. The sixth paper tape stopper is used to limit the output double-layer adhesive strip P2, ensuring that the double-layer adhesive strip P2 is aligned with the input second slitting assembly 6.

[0060] Preferably, if Figure 5 As shown in the figure, since the conveying path of the double-layer adhesive strip P2 obtained by the adhesive component 5 is long, in order to prevent the strip from deviating during the conveying process, the adhesive component 5 also includes a paper tape corrector 503, which is arranged downstream of the third pressure roller 501 and the adhesive bottom roller 502. The paper tape corrector 503 is used to limit the position of the double-layer adhesive strip P2 to prevent the double-layer adhesive strip P2 from deviating, so as to ensure that the output double-layer adhesive strip P2 can accurately enter the downstream second slitting component 6.

[0061] In some optional embodiments, if the glue of the gluing component 3 is PVA, the bonding component 5 further includes a heating device (not shown) disposed within the third pressure roller 501 and / or the bonding roller 502. By heating the roller surface of the third pressure roller 501 and / or the bonding roller 502, the glue can be rapidly solidified and bonded, thereby preventing the bonding surface of the double-layer adhesive strip P2 from shifting during transport. If the glue of the gluing component 3 is hot melt adhesive, a cooling channel can be further provided within the third pressure roller 501 and / or the bonding roller 502. The bonding component 5 further includes a cooling component connected to the cooling channel. Coolant is passed through the cooling component to the interior of the third pressure roller 501 and / or the bonding roller 502 to cool the roller surface of the third pressure roller 501 and / or the bonding roller 502, thereby cooling the bonding surface, thereby rapidly solidifying the glue, improving the bonding strength, and preventing the bonding surface of the double-layer adhesive strip P2 from shifting during transport.

[0062] Figure 9 Schematic diagram of the structure of the second slitting assembly and the second translation assembly of the present invention, as shown in FIG. Figure 9 As shown in FIG, the second slitting assembly 6 includes a second knife roller 603 rotating around its own axis, a second conveying roller 602 ( Figure 5 As shown in , similar to Figure 3 The first conveyor roller 203 in the figure); wherein the roller surfaces of the second knife roller 603 and the second conveyor roller 602 are arranged opposite to each other, with their axes being parallel to each other and transverse to the conveying direction of the original strip; the second knife roller includes a plurality of second rotating circular knives 604, and the roller surface of the second conveyor roller 602 is provided with a second annular cutting groove matching each second rotating circular knife 604 or a second lower blade meshing with each second rotating circular knife in the circumferential direction. For example, when the total number of wide strips cut by the first slitting assembly 2 at one time is M , the total number of narrow strips is N When the second slitting assembly 6 slits multiple double-layer strips output by the adhesive assembly at one time, the second knife roller includes ( N - M ) The second rotary circular knife 604 can be used for one-time cutting M Double strips were obtained N Obviously, when the second slitting assembly is used Figure 5 When the device shown (i.e. when N =2, M =1), such as Figure 9 As shown in FIG, the second knife roller 603 includes a second rotating circular knife 604 for cutting the input width of c The double-layer adhesive strip P2 is cut longitudinally into strips having a width of d The first double-layer strip P21 and the second double-layer strip P22 are formed to realize equal cutting of the double-layer adhesive strip P2 with a similar Chinese-shaped structure.

[0063] Preferably, similar to the first slitting assembly 2, as Figure 5 As shown in , the second slitting assembly 6 may further include a second pinch roller 601. By locking the second pinch roller 601, the double-layer adhesive strip P2 is pressed against the second conveyor roller 602. After the double-layer adhesive strip P2 forms a certain wrap angle with the second conveyor roller 602, it is slit along the length of the double-layer adhesive strip P2 by the second rotating circular blade 604 on the second blade roller 603. The second pinch roller 601 can be driven by a motor or a cylinder, depending on the actual space limitations of the equipment.

[0064] Similar to the first slitting component 2, the second pressure roller 601 in the second slitting component 6 can also include a second pressure roller rotating shaft, a second pressure roller surface, a second pressure roller connecting device, and a second locking component not shown in the figure. The position of the second pressure roller 601 is adjusted manually or automatically and locked or unlocked to achieve the double-layer adhesive strip P2 being pressed tightly against the second conveying roller 602.

[0065] Similar to the first slitting component 2, the second conveyor roller 602 can also include a second conveyor roller power component, a second conveyor roller rotating shaft, and a second conveyor roller connecting device not shown in the figure. The second conveyor roller is connected to the second conveyor roller power component through the second conveyor roller rotating shaft and the second conveyor roller connecting device. The second conveyor roller power component synchronously tracks the production speed of the equipment and adaptively drives the second conveyor roller rotating shaft to rotate, cooperating with the second pressure roller 601 to realize the traction and conveying of the double-layer adhesive strip P2.

[0066] Similar to the first slitting component 2, the second knife roller 603 can also include a second knife roller power component, a second circular knife rotating shaft, a second knife roller eccentric bearing seat, and a second knife roller connecting device not shown in the figure. The second rotating circular knife 604 is installed on the second circular knife rotating shaft and is fixed to the second knife roller 603 through the second knife roller connecting device. The second circular knife rotating shaft is connected to the second knife roller power component; the second rotating circular knife 604 is driven to rotate rapidly by the second knife roller power component, and the second knife roller eccentric bearing seat is rotated manually or by a motor / cylinder drive, driving the second circular knife rotating shaft installed in the second knife roller eccentric bearing seat to move eccentrically, thereby controlling the second rotating circular knife 604 to enter or leave the knife groove of the second conveying roller 602 during the rotation of the second circular knife rotating shaft, and the second rotating circular knife 604 cuts the double-layer adhesive strip P2 into 2 strips. The second slitting assembly 6 can also include a seventh paper tape limiter and an eighth paper tape limiter respectively arranged on the strip inlet side and outlet side of the second knife roller 603, which are used to limit the input double-layer adhesive strip P2 and the output first double-layer strip P21 and second double-layer strip P22 laterally (in the width direction of the strip), respectively.

[0067] In some embodiments, as Figure 9 As shown in , the second translation assembly 7 includes at least one set of separation roller assemblies 701. The separation roller assembly 701 includes two second guide rollers installed at a certain angle and rotating around their own axes. The axes of the two second guide rollers are in a shape of high in the middle and low on both sides in a cross section perpendicular to the input direction of the two double-layer strips. After the first double-layer strip P21 and the second double-layer strip P22 pass through the two second guide rollers on the separation roller assembly 701 respectively, due to the change in the internal tension of the paper strips, the first double-layer strip P21 and the second double-layer strip P22 will be translated and separated in the width direction. After passing through Figure 5 After being guided by some guide rollers shown in the figure, the first double-layer strip P21 reaches the center position of the entrance of the first forming component 9, and the second double-layer strip P22 reaches the center position of the entrance of the second forming component 10, completing the lateral translation of the center line of the double-layer paper tape.

[0068] In this embodiment of the present invention, the second translation assembly 7 directs the web surfaces of the first and second double-layered strips in parallel and in the same fourth plane along the longitudinal centerline of the double-layered strips. After the tension control assembly 8 adjusts the web tension and other steering rollers direct the web surfaces, the web surfaces of the first and second double-layered strips are ultimately directed in parallel and in the same plane along the longitudinal centerline of the double-layered strips to the first forming assembly 9 and the second forming assembly 10. In this embodiment, the first forming assembly 9 and the second forming assembly 10 can be arranged in mirror images horizontally and transversely to the conveying direction of the first and second double-layered strips; alternatively, the first forming assembly 9 and the second forming assembly 10 can be arranged in a front-to-back staggered arrangement in the conveying direction of the first and second double-layered strips, such that the inlet centerline of the first forming assembly 9 coincides with the longitudinal centerline of the first double-layered strip, and the second forming assembly 10 does not obstruct the conveying of the first double-layered strip / first double-layered tubular object; the inlet centerline of the second forming assembly 10 coincides with the longitudinal centerline of the second double-layered strip, and the first forming assembly 9 does not obstruct the conveying of the second double-layered strip / second double-layered tubular object. For example Figure 5 The first forming assembly 9 and the second forming assembly 10 shown in the figure are sequentially arranged on the conveying path of the double-layer strip downstream of the tension control assembly 8, and are respectively located upstream and downstream in the conveying direction of the double-layer strip, thereby providing space for the first forming assembly 9 and the second forming assembly 10 to be staggered. Figure 5In the top view of the device shown, assuming that the first double-layer strip P21 is located on the right side of the second double-layer strip P22, the first forming assembly 9 can also be set to the right side of the output end of the tension control assembly 8, and the second forming assembly 10 can be set to the left side of the output end of the tension control assembly 8, so that the first forming assembly 9 forms the first double-layer strip P21 on the right side into a first double-layer tubular object G1, and the second forming assembly 10 forms the second double-layer strip P22 on the left side into a second double-layer tubular object G2. Obviously, when there are multiple forming assemblies, the entrance centers of the multiple forming assemblies can be staggered in the strip conveying direction and in the horizontal direction transverse to the strip conveying direction without interfering with each other according to the space and layout requirements of the workshop site. After the second translation assembly 7 translates and separates the multiple double-layer strips, it is only necessary to set various steering rollers to send the multiple double-layer strips into each forming assembly separately, which will not be repeated here.

[0069] Figure 10 is a schematic cross-sectional view of the first molding assembly of the present invention, as shown in Figure 10 As shown in FIG, the first forming assembly 9 may include a base 901, a first side forming block 903, a second side forming block 904, and a core rod 905. The first double-layer paper strip P21 is curled and formed into a tubular object by the working curved surfaces of the base 901, the first side forming block 903, and the second side forming block 904. During the forming process, the inner side of the tubular object is supported by the core rod 905 to prevent the first double-layer paper strip P21 from collapsing inward during the forming process. Finally, the glue is cured by the sealing assembly (not shown) to complete the paper tube shape, thus forming the double-layer tubular object G1.

[0070] In some preferred embodiments, the first molding assembly 9 and the second molding assembly 10 also have a heating or cooling function to heat / cool the sealing edge of the molded double-layer tubular object to achieve rapid solidification of the sealing glue.

[0071] In some embodiments, the double-layer tubular manufacturing apparatus of the present invention may further include: an auxiliary material strip supply assembly for providing auxiliary material strips as tubular lining and / or outer wrapping materials to the forming assembly; wherein the forming assembly is further used to introduce the auxiliary material strips and form the auxiliary material strips into a specific shape or structure to form an inner lining and / or wrap the outer surface of the double-layer tubular. For example Figure 5 As shown in FIG, the first auxiliary material strip supply assembly 13 provides auxiliary material strips for the first molding assembly 9 , and the second auxiliary material strip supply assembly 14 provides auxiliary material strips for the second molding assembly 10 .

[0072] In some embodiments, as Figure 5 As shown in , the manufacturing device of the double-layer tubular object of the present invention may further include: A cutting assembly 11 is provided downstream of the forming assembly and is used to cut the continuous double-layer tubular objects G1 and G2 output by the forming assembly into tubular rods of a specified length; The conveying assembly 12 is disposed downstream of the cutting assembly 11 and is used to arrange and output the tubular rods output by the cutting assembly in an orderly manner.

[0073] Corresponding to the above-mentioned double-layer tubular article manufacturing device provided in the embodiment of the present invention, the embodiment of the present invention also provides a double-layer tubular article manufacturing method, such as Figure 11 As shown in , the method includes the following steps: S10: cutting the original strip into at least one wide strip and at least two narrow strips narrower than the wide strip, and outputting the cut wide strip along a first plane, and outputting the cut narrow strips along a second plane that does not overlap with the first plane; S20: Apply glue on one side of the wide strip or narrow strip; S30: bonding the glue-coated surface of each wide strip to at least two adjacent narrow strips via the glue-coated surface so that the narrow strips are in the same plane to form a double-layer bonded strip, with a gap between the bonded adjacent narrow strips; S40: cutting the double-layer adhesive strip along the gap between adjacent narrow strips to obtain at least two double-layer strips; S50: Curling at least two double-layer strips simultaneously and separately to form a continuous double-layer tubular object whose axis is parallel to the conveying direction.

[0074] Figure 11 The method shown corresponds to Figure 1 The working principle of the device shown will not be described in detail here.

[0075] In some embodiments, after S10 and before S30, the method of the present invention further includes step S21: translating the plurality of narrow strips along their width direction so that there are gaps of predetermined widths between adjacent narrow strips and the strip surfaces of adjacent narrow strips are output along a third plane.

[0076] In some embodiments, after S40 and before S50, the method of the present invention further includes step S41: translating the center line of the double-layer strip output from S40 along its width direction so that each double-layer strip is translated to the center position of the entrance of the forming assembly for curling it.

[0077] In some embodiments, the step of slitting the original strip into at least one wide strip and at least two narrow strips narrower than the wide strip in S10 specifically includes: slitting the original strip into n A group of strips, each group of strips comprising a first strip having a first width, a second strip having a second width, and a third strip having a third width; wherein the second width is greater than the first width and the third width;n is a positive integer; preferably, n= 1. In these embodiments, S21 specifically includes: i The first and third strips in the strip group are translated along their width direction to a gap with a predetermined width between them, and the translated third strip is i The strip surfaces of the first strip and the third strip in the strip group are output along the third plane; wherein, i =1,2,…, n In these embodiments, S30 specifically includes: i The gap center line of the first strip and the third strip in the group of strips output by S21 is the same as the gap center line of the first strip and the third strip. i The width direction center line of the second strip after S20 glue coating in the group of strips is aligned perpendicular to the strip surface direction of the second strip, and the first strip is glued to the surface of the second strip. i The first strip, the second strip and the third strip in the strip group are bonded to form a double-layer bonded strip with a herringbone-like structure in which the first strip and the second strip are on the same layer.

[0078] In some embodiments, before S10, the method of the present invention further includes step S00: uncoiling the coiled strip into original strips and then continuously conveying the original strips.

[0079] In some embodiments, before S50, the method of the present invention also includes step S42: importing auxiliary material strips as the inner lining and / or outer wrapping material of the tubular object; in this embodiment, S50 also includes: while curling the double-layer strip into a double-layer tubular object, forming the auxiliary material strips into an inner lining inside the double-layer tubular object and / or wrapping the outer side of the double-layer tubular object in a specific shape or structure.

[0080] In some embodiments, after S50, the method of the present invention further includes the steps of: S60: cutting the continuous double-layer tubular material into tubular rods of specified length; S70: Arrange the tubular rods in an orderly manner and output them.

[0081] The method for manufacturing a double-layer tubular object provided in an embodiment of the present invention also includes the process flow method for making tubular objects by each component in the double-layer tubular object manufacturing device provided in the above embodiment, all of which are within the scope of protection requested by the method of the present invention, and the specific working method of each component will not be repeated here.

[0082] The manufacturing method for double-layer tubular articles provided in an embodiment of the present invention involves slitting a raw strip into at least one wide strip and at least two narrow strips, applying glue to the wide strip, and bonding multiple narrow strips to a wide strip to form a double-layer bonded strip. The double-layer bonded strip is then cut along the gaps between adjacent narrow strips into multiple double-layer strips, and each double-layer strip is finally directly formed longitudinally into a double-layer tubular article. On one hand, this device avoids the uneven surface of the tubular article caused by the spiral winding free-form process. Simultaneously, the single-step tubular molding also results in a high degree of roundness, effectively improving the appearance and roundness quality of the tubular article. On the other hand, only one side of the double-layer tubular article is coated with glue. Compared to the spiral winding method, which requires glue to be applied between each two layers of the strip, this method reduces the amount of glue used, improving food safety while reducing the odor caused by the glue. On the other hand, by gluing multiple narrow strips from the same original strip onto a wide strip and then cutting them into multiple double-layer strips, it is possible to ensure that the two layers of material used to produce double-layer tubular objects at the same time are completely consistent, making it convenient to control the glue and processing technology used, reduce product variation, and improve product quality; in addition, multiple double-layer strips of the same material are formed simultaneously in parallel on the conveyor line through multiple forming components, which can exponentially increase production efficiency compared to the technology that a single production line can only produce one paper tube.

[0083] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A device for manufacturing a double-layer tubular object, characterized in that: include: a first slitting assembly for slitting an original strip into at least three strips, wherein the at least three strips include at least one wide strip and at least two narrow strips narrower than the wide strip, and the first slitting assembly is further configured to output the slit wide strips along a first plane and output the slit narrow strips along a second plane that does not overlap with the first plane; a gluing assembly, disposed downstream of the first slitting assembly, for applying glue on one surface of the wide strip or the narrow strip; a bonding assembly disposed downstream of the gluing assembly, for bonding each wide strip to at least two adjacent narrow strips via the glue-coated surface so that the narrow strips are in the same plane to form a double-layer bonded strip, with gaps between the bonded adjacent narrow strips; a second slitting assembly, which is arranged downstream of the bonding assembly and is used to slit the double-layer adhesive strip output by the bonding assembly along the gap between adjacent narrow strips to obtain at least two double-layer strips; N Each forming assembly is used to curl a double-layer strip into a continuous double-layer tubular object with its axis parallel to the conveying direction; wherein, N is equal to the total number of narrow strips cut by the first cutting assembly, N is a positive integer greater than 1.

2. The manufacturing device of the double-layer tubular object according to claim 1, characterized in that: The manufacturing device further comprises: a first translation assembly and / or a second translation assembly; A first translation assembly is disposed downstream of the first slitting assembly, and is used to translate the plurality of narrow strips along their width direction so that gaps of a predetermined width exist between adjacent narrow strips and the strip surfaces of adjacent narrow strips are output along a third plane; The second translation assembly is arranged downstream of the second slitting assembly, and is used to translate each double-layer strip output by the second slitting assembly along its width direction so that each double-layer strip is translated to the center position of a forming assembly entrance.

3. The manufacturing device of the double-layer tubular object according to claim 2, characterized in that: The first slitting assembly slits the original strip in the width direction into n A group of strips, each group of strips comprising a first strip having a first width, a second strip having a second width, and a third strip having a third width; wherein the second width is greater than the first width and the third width; n is a positive integer, N =2 n ; The first translation component i The first and third strips in the group strips are translated along their width direction and then output; wherein, i =1,2,…, n ; The bonding assembly will i The center line of the gap between the first strip and the third strip in the group of strips translated by the first translation component and the center line of the gap between the first strip and the third strip i The width direction center line of the second strip in the group of strips is aligned perpendicular to the strip surface direction of the second strip, and the first strip is glued to the surface. i The first strip, the second strip and the third strip in the strip group are bonded to form a double-layer bonded strip with a herringbone-like structure in which the first strip and the second strip are on the same layer.

4. The manufacturing device for a double-layer tubular object according to claim 3, characterized in that: described n =1, the first slitting assembly slits the original strip into the first strip, the second strip, and the third strip in sequence in the width direction of the original strip; the first width is equal to the third width, and the second width is equal to L 2 and the first width L 1 satisfies the relationship: L 2=2 L 1± l ,in, l is the preset difference.

5. The manufacturing device of the double-layer tubular object according to claim 4, characterized in that: The second slitting assembly slits the double-layer adhesive strip of the T-shaped structure along the center line of the gap between the first strip and the third strip to obtain a first double-layer strip consisting of the fourth strip and the first strip and a second double-layer strip consisting of the fifth strip and the third strip; Wherein, the manufacturing device specifically includes a first molding component and a second molding component; The first forming assembly curls the left and right sides of the first double-layer strip upward / downward along the width direction thereof, so that the front end surface of the first double-layer strip is formed into a circle, the left and right sides of the fourth strip are opposite to each other, and the left and right sides of the first strip are opposite to each other; The second molding component curls the left and right sides of the second double-layer strip upward / downward along its width direction, so that the front end face of the second double-layer strip is formed into a circle, the left and right sides of the fifth strip are opposite, and the left and right sides of the third strip are opposite.

6. The manufacturing device for a double-layer tubular object according to any one of claims 1 to 5, characterized in that: The width of the gaps between adjacent narrow strips output by the first translation assembly is 2 mm to 8 mm.

7. The manufacturing device of the double-layer tubular object according to claim 1, characterized in that: The widths of any two narrow strips are equal or unequal; The bonding components will enter the adjacent k A narrow strip is bonded to a wide strip, the width of which is greater than or equal to the adjacent k The sum of the widths of the narrow strips; where, k is a positive integer greater than or equal to 2.

8. The manufacturing device for a double-layer tubular object according to claim 1, characterized in that: The gluing assembly includes a glue supply component and a nozzle; the glue supply component is connected to the nozzle and supplies glue to the nozzle; the glue outlet of the nozzle has a preset shape so that when the glue outlet applies glue to the tape surface of the wide strip, at least one glue-free area extending along the length direction of the wide strip is formed on the glue-coated surface of the wide strip; The bonding assembly aligns the center line of the gap between adjacent narrow strips inputted with the center line of the glue-free area on the wide strip inputted in a direction perpendicular to the strip surface of the wide strip, and bonds the narrow strips to the wide strip via the glue-coated surface; The second slitting assembly slits the double-layer adhesive strip along the glue-free area.

9. The manufacturing device for a double-layer tubular object according to claim 1, characterized in that: The first slitting assembly includes a first knife roller and a first conveying roller that rotate around its own axis; the roller surfaces of the first knife roller and the first conveying roller are arranged opposite to each other, and the axes of the two are parallel to each other and transverse to the conveying direction of the original strip; the first knife roller is provided with a plurality of first rotating circular knives, and the roller surface of the first conveying roller is provided with a first annular cutting groove matching each first rotating circular knife or a first lower blade meshing with each first rotating circular knife in the circumferential direction; and / or The second slitting assembly includes a second knife roller and a second conveying roller that rotate around its own axis; the roller surfaces of the second knife roller and the second conveying roller are arranged opposite to each other, and the axes of the two are parallel to each other and transverse to the conveying direction of the original strip; the second knife roller is provided with a plurality of second rotating circular knives, and the roller surface of the second conveying roller is provided with a second annular cutting groove matching each second rotating circular knife or a second lower blade meshing with each second rotating circular knife in the circumferential direction.

10. A method for manufacturing a double-layer tubular object, characterized in that: The method comprises the following steps: S10: slitting the original strip into at least one wide strip and at least two narrow strips narrower than the wide strip, and outputting the slitting wide strip along a first plane, and outputting the slitting narrow strips along a second plane that does not overlap with the first plane; S20: applying glue on one surface of the wide strip or the narrow strip; S30: bonding the glue-coated surface of each wide strip to at least two adjacent narrow strips via the glue-coated surface so that the narrow strips are in the same plane to form a double-layer bonded strip, with a gap between the bonded adjacent narrow strips; S40: cutting the double-layer adhesive strip along the gap between adjacent narrow strips to obtain at least two double-layer strips; S50: The at least two double-layer strips are simultaneously rolled and formed into continuous double-layer tubular objects whose axes are parallel to the conveying direction.

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