A central tube forming machine

Abstract

The present invention discloses a central tube forming machine, comprising two cutting knives for cutting the central tube in radial direction, an outer ring knife disc coaxially arranged with the central tube and capable of pushing the two cutting knives to progressively advance toward the center of the central tube, and a driving mechanism connected with the outer ring knife disc and driving the outer ring knife disc to move along the axial direction of the central tube. The central tube forming machine can realize the precise advancement of the cutting knives, and the arrangement of the two cutting knives can realize uniform force cutting of the central tube during the cutting process, thereby improving the forming quality and cutting efficiency of the central tube.

Description

Technical Field

[0001] The invention relates to the technical field of pipe processing, in particular to a central pipe forming machine. Background Art

[0002] The existing center tube forming machine usually folds the two ends of the iron sheet first, curls and rounds them according to the folded edges, and buckles the folded edges, and finally cuts the center according to the required length to achieve the center tube processing and forming. However, the cutting of the existing center tube forming machine is driven by a single cutting knife driven by a gear transmission, so that it is progressively advanced to the cutting position to achieve cutting. Since the gear drives the cutting knife to progress and is affected by the tooth pitch, the progressive accuracy of the cutting knife is low. At the same time, since the center tube is subjected to unidirectional force, the center tube is easy to deform, which affects the center tube forming accuracy. In addition, a single cutting knife needs to perform multiple cycles of cutting, which is inefficient.

[0003] Therefore, how to avoid affecting the forming accuracy of the central tube due to the gear driving the single cutting knife to achieve cutting is a technical problem that technical personnel in this field need to solve at present. Summary of the invention

[0004] The object of the present invention is to provide a central tube forming machine, which can realize the precise advancement of the cutting knife and realize uniform force cutting of the central tube during the cutting process, thereby improving the forming quality and cutting efficiency of the central tube.

[0005] To achieve the above-mentioned purpose, the present invention provides a center tube forming machine, comprising two cutting knives for radially cutting the center tube, an outer ring cutter disc coaxially arranged with the center tube and capable of pushing the two cutting knives progressively toward the center of the center tube, and a driving mechanism connected to the outer ring cutter disc for driving the outer ring cutter disc to move axially along the center tube.

[0006] Optionally, it also includes two connecting shafts which are parallel to each other and arranged in a horizontal direction and perpendicular to the central tube, and any of the cutting knives is connected to a knife body connecting member which is sleeved on the two connecting shafts and is used to drive the cutting knife to move in a horizontal direction.

[0007] Optionally, any of the connecting shafts is provided with an elastic connecting member located between the two knife body connecting members for allowing the cutting knife to retract when the cutting knife completes cutting.

[0008] Optionally, it also includes a vertically arranged fixing plate for fixing the connecting shaft, and a bearing connecting member is provided on the side of the outer ring cutter disc away from the fixing plate for contacting the outer ring cutter disc when the outer ring cutter disc moves axially outward along the center tube, and a rotating connecting member is fixed to the bearing connecting member and is used to push the cutter body connecting member to move axially along the connecting shaft when the outer ring cutter disc contacts the bearing connecting member and continues to move axially outward along the center tube.

[0009] Optionally, it further comprises a U-shaped bracket fixedly connected to the fixing plate and rotatably connected to the rotating connecting member, wherein a rotating shaft for the rotating connecting member to rotate around an axis in a vertical direction is arranged in a notch of the U-shaped bracket.

[0010] Optionally, it also includes a driving motor that is connected to the cutting knife and is used to drive the cutting knife to rotate and achieve cutting when the cutting knife advances to a preset cutting position.

[0011] Optionally, it also includes a guide track arranged on the outer periphery of the outer ring cutter disc for guiding when the outer ring cutter disc moves.

[0012] Optionally, the guide rail includes a plurality of arc-shaped limit blocks distributed along the circumference of the outer ring cutter disc for limiting the outer ring cutter disc, and any of the arc-shaped limit blocks is provided with a limit hole passing through along its thickness direction for allowing the outer ring cutter disc to move axially outward along the center tube, and a connecting screw provided in the limit hole for sliding along the limit hole.

[0013] Optionally, the driving mechanism includes a cylinder seat and a telescopic rod cooperatively connected to the cylinder seat for telescopic movement along the cylinder seat, and also includes a connecting rod arranged at the top of the outer ring cutter disc and radially arranged along the outer ring cutter disc, and a universal bearing arranged at the end of the telescopic rod for connecting the connecting rod and the telescopic rod.

[0014] Optionally, it also includes a machine cover, the interior of which is provided with a feed port for conveying sheet material, a folding mechanism connected to the feed port and used for folding the sheet material, and a curling and rounding mechanism connected to the folding mechanism and used for curling the sheet material to form a center tube, the curling and rounding mechanism including a curling roller coaxially arranged with the outer ring cutter disc and used for conveying the center tube to the cutting station.

[0015] Compared with the above-mentioned background technology, the present invention designs a center tube forming machine according to the different requirements of center tube forming. Since traditional cutting equipment uses gears to drive the cutting knife to advance, the advancement accuracy of the cutting knife is low due to the influence of the tooth pitch. At the same time, since the center tube is subjected to unidirectional force, the center tube is easy to deform, which affects the center tube forming accuracy. Moreover, a single cutting knife needs to perform multiple cycles of cutting, and the cutting efficiency is low. Therefore, it is necessary to use a center tube forming machine that can improve the forming quality and cutting efficiency of the center tube.

[0016] Specifically, the central tube forming machine includes a cutting knife, an outer ring knife disc and a driving mechanism; wherein the two cutting knives are used to cut the central tube along the radial direction of the central tube; the outer ring knife disc is coaxially arranged with the central tube, and the outer ring knife disc is used to push the two cutting knives to the center of the central tube to achieve cutting; the driving mechanism is connected to the outer ring knife disc, and the driving mechanism is used to drive the outer ring knife disc to move along the axial direction of the central tube, thereby achieving the function of pushing the two cutting knives to the center of the central tube. The above arrangement can achieve the precise advancement of the cutting knives, and at the same time, the arrangement of the two cutting knives can achieve uniform force cutting of the central tube during the cutting process, thereby improving the forming quality and cutting efficiency of the central tube. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0018] Figure 1 A schematic structural diagram of a cutting mechanism of a central tube forming machine disclosed in an embodiment of the present invention;

[0019] Figure 2 It is a schematic diagram of the overall structure of a central tube forming machine disclosed in an embodiment of the present invention;

[0020] Figure 3 for Figure 2 Schematic diagram of the structure inside the middle cover;

[0021] Figure 4 for Figure 2 Structural diagram of the middle folding mechanism;

[0022] Figure 5 for Figure 4 Schematic diagram of the folding effect of the folding mechanism.

[0023] in:

[0024] 01-machine cover, 02-machine frame, 03-sheet material, 1-feed port, 2-folding mechanism, 21-upper cover plate, 22-lower groove plate, 23-retaining ring mechanism, 3-curling and embracing mechanism, 31-curling roller, 4-cutting mechanism, 41-fixed plate, 42-driving mechanism, 43-universal bearing, 44-connecting rod, 45-outer ring cutter disc, 46-guide rail, 47-limiting hole, 48-bearing connector, 49-rotating connector, 50-knife body connector, 51-connecting shaft, 52-elastic connector, 53-cutting knife, 54-driving motor. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The core of the present invention is to provide a central tube forming machine, which can realize the precise advancement of the cutting knife and realize uniform force cutting of the central tube during the cutting process, thereby improving the forming quality and cutting efficiency of the central tube.

[0027] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] It should be noted that the directional words such as "above, below, left side, right side" described below are all defined based on the drawings in the specification.

[0029] Please refer to Figures 1 to 5 , Figure 1 A schematic structural diagram of a cutting mechanism of a central tube forming machine disclosed in an embodiment of the present invention; Figure 2 It is a schematic diagram of the overall structure of a central tube forming machine disclosed in an embodiment of the present invention; Figure 3 for Figure 2 Schematic diagram of the structure inside the middle cover; Figure 4 for Figure 2 Structural schematic diagram of the middle folding mechanism; Figure 5 for Figure 4 Schematic diagram of the folding effect of the folding mechanism.

[0030] The central tube forming machine provided in the embodiment of the present invention is mainly used for feeding, folding, curling and cutting of the central tube, so that central tubes of different lengths can be obtained according to actual needs. The central tube forming machine includes a feeding mechanism, a folding mechanism 2, a curling and rounding mechanism 3 and a cutting mechanism 4, and also includes a machine cover 01 and a frame 02, wherein the frame 02 is used to carry the feeding mechanism, the folding mechanism 2, the curling and rounding mechanism 3 and the cutting mechanism 4, and the machine cover 01 is arranged above the frame 02 and is used to protect the above mechanisms.

[0031] Furthermore, the feeding mechanism is used to feed the sheet material 03 to the folding mechanism 2, and the feeding mechanism includes a feeding roller and a feed port 1, wherein the feeding roller is used to wind the sheet material 03, that is, the sheet material 03 can be wound around the feeding roller in circles, and the sheet material 03 can be transported from the feeding roller to the feed port 1 through the rotation of the feeding roller, and guided into the folding mechanism 2 through the feed port 1. In addition, the feeding mechanism can also include two feed clamping wheels that are relatively arranged with a preset gap, and the feed clamping wheel arranged at the top can rotate counterclockwise around its axis, and the feed clamping wheel arranged at the bottom can rotate clockwise around its axis, and the two feed clamping wheels can clamp the sheet material 03, so that the sheet material 03 can be transported to the folding mechanism 2 under the action of friction.

[0032] The folding mechanism 2 is used to supply the sheet material 03 to form folding edges at the lower left and upper right. Since the material width of the sheet material 03 is fixed, and the final product is a central tube of unequal length, in order to facilitate the buckling and extrusion molding of the two sheets 03 at the interface in the curling and embracing mechanism 3, folding edges at the lower left and upper right can be formed; the folding mechanism 2 includes an upper cover plate 21 and a lower groove plate 22, and a retaining ring mechanism 23 is arranged on the left and right sides of the middle position of the folding mechanism 2; wherein, the upper cover plate 21 and the lower groove plate 22 are used to supply the sheet material 03 to form folding edges at the lower left and upper right, the retaining ring mechanism 23 on the left side is provided with a large retaining ring located at the top and a small retaining ring located below the large retaining ring, and the retaining ring mechanism 23 on the right side is provided with a small retaining ring located at the top and a large retaining ring located below the small retaining ring, so that the large retaining ring on the top can achieve the effect of folding downward, and the small retaining ring on the top can achieve the effect of flipping upward. Of course, according to actual needs, the bending slope of the sheet 03 can be adjusted by adjusting the positions of the large retaining ring and the small retaining ring, for example, different bending slopes such as 45° or 50° can be formed.

[0033] The curling and embracing mechanism 3 is used to curl and embracing the folded sheet material 03, and realizes the extrusion and buckling of the folding position through the extrusion wheel, so as to form a center tube; the curling and embracing mechanism 3 includes a curling roller 31 and a servo motor driving the curling roller 31 to rotate, and also includes an extrusion wheel arranged below the curling roller 31, so that the folded sheet material 03 conveyed by the folding mechanism 2 can be spirally wound on the curling roller 31 under the action of the extrusion wheel and the curling roller 31, and the upward folded edge and the downward folded edge are buckled and squeezed by the extrusion wheel, so as to form a center tube on the curling roller 31. Of course, according to actual needs, a guide component can be set at the curling and embracing position, so that the folded sheet material 03 that just enters the curling and embracing mechanism 3 does not need to be manually curled, but is directly curled onto the curling roller 31 through the guide component, and the subsequent guide component makes the curling of the center tube smoother. The setting of the guide component can refer to the relevant technical requirements of the prior art, which will not be expanded here one by one.

[0034] Furthermore, the center tube forming machine also includes a cutting mechanism 4, which includes a cutting knife 53, an outer ring knife disc 45 and a driving mechanism 42; wherein, the two cutting knives 53 are used to cut the center tube along the radial direction of the center tube, and the two cutting knives 53 can be connected to each other and respectively arranged on both sides of the center tube to achieve uniform cutting of the center tube along the radial direction of the center tube; the outer ring knife disc 45 is coaxially arranged with the center tube, and can push the two cutting knives 53 to the center of the center tube to achieve cutting; the driving mechanism 42 is connected to the outer ring knife disc 45, and the driving mechanism 42 is used to drive the outer ring knife disc 45 to rotate, and then move along the axial direction of the center tube, thereby achieving the function of pushing the two cutting knives 53 to the center of the center tube.

[0035] Compared with the traditional gear-driven advancement of the cutting knife 53, the above-mentioned center tube forming machine can achieve precise advancement of the cutting knife 53. At the same time, the setting of the two cutting knives 53 can achieve uniform force cutting of the center tube during the cutting process, thereby improving the forming quality and cutting efficiency of the center tube.

[0036] In an embodiment of the present invention, the center tube forming machine also includes two connecting shafts 51 parallel to each other, and the two connecting shafts 51 are arranged horizontally and perpendicular to the direction of the center tube, that is, the two connecting shafts 51 can be respectively arranged above and below the center tube. Any cutting knife 53 is connected to a knife body connecting part 50, and the knife body connecting part 50 is sleeved on the two connecting shafts 51 and can move along the axial direction of the connecting shaft 51, so that the function of driving the cutting knife 53 to move in the horizontal direction can be realized.

[0037] According to actual needs, the cutting knife 53 can be fixed to the middle position of the knife body connecting member 50, and the upper end of the knife body connecting member 50 is provided with a first connecting hole coaxially arranged with the connecting shaft 51 located above the central tube, and the lower end of the knife body connecting member 50 is provided with a second connecting hole coaxially arranged with the connecting shaft 51 located below the central tube, so that the purpose of driving the cutting knife 53 to progress toward the center of the central tube through the axial movement of the knife body connecting member 50 along the connecting shaft 51 can be achieved. Of course, for the above-mentioned setting, as long as the setting mode that can achieve the cutting knife 53 being driven to progress toward the center of the central tube through the knife body connecting member 50 is within the protection scope of this application, and this article is not limited to the above-mentioned setting mode.

[0038] After the cutting is completed, in order to facilitate the retraction of the cutting knife 53, any connecting shaft 51 can be provided with an elastic connecting member 52, and the elastic connecting member 52 is sleeved on the connecting shaft 51, and the elastic connecting member 52 is located between the two knife body connecting members 50. For example, the elastic connecting member 52 can be set as a spring component, that is, when the knife body connecting members 50 located on both sides of the central tube move toward the center of the central tube, the spring component is in a compressed state, and when the cutting knife 53 reaches the cutting position, the compression amount of the spring component is the maximum, and when the driving force that drives the knife body connecting member 50 to advance is withdrawn, the cutting knife 53 can automatically retract under the elastic force of the spring component.

[0039] Furthermore, the central tube forming machine further comprises a fixing plate 41 which is vertically arranged and used for fixing and installing the connecting shaft 51. A bearing connector 48 and a rotating connector 49 are arranged on the side of the outer ring cutter disc 45 away from the fixing plate 41. When the outer ring cutter disc 45 moves along the axial direction of the central tube to the side away from the fixing plate 41, the bearing connector 48 can contact and abut against the outer ring cutter disc 45. The rotating connector 49 is fixedly connected to the bearing connector 48. When the outer ring cutter disc 45 contacts the bearing connector 48 and continues to move along the axial direction of the central tube to the side away from the fixing plate 41, the rotating connector 49 can be driven to rotate. The rotation of the rotating connector 49 can further promote the axial movement of the cutter body connector 50 along the connecting shaft 51. Of course, the contact surface between the bearing connector 48 and the outer ring cutter disc 45 is a smooth and wear-resistant contact surface.

[0040] That is to say, when the outer ring cutter disc 45 is in its original position, the outer ring cutter disc 45 is not in contact with the bearing connector 48; in the process of the driving mechanism 42 driving the outer ring cutter disc 45 to move along the central tube axis toward the side away from the fixed plate 41, the outer ring cutter disc 45 first contacts the bearing connector 48, and further pushes the bearing connector 48 to cause the rotating connector 49 to rotate, so as to realize the movement of the cutter body connector 50.

[0041] In addition, the center tube forming machine also includes a U-shaped bracket fixedly connected to the fixed plate 41 and used to be rotatably connected to the rotating connection member 49. A rotating shaft is arranged in the groove of the U-shaped bracket, and the rotating shaft is used for the rotating connection member 49 to rotate around the vertical axis. In this way, when the outer ring cutter disc 45 comes into contact with the bearing connection member 48 and continues to move, the rotating connection member 49 can be driven to rotate around the axial direction of the rotating shaft, thereby achieving the purpose of pushing the knife body connection member 50 to move.

[0042] Of course, the connection between the outer ring cutter disc 45 and the cutting knife 53 can also be set in other different ways, and this article does not make any specific restrictions on this; in addition, the center tube forming machine also includes a drive motor 54 connected to the cutting knife 53. When the cutting knife 53 advances to the preset cutting station, the drive motor 54 is used to drive the cutting knife 53 to rotate, thereby realizing the cutting of the center tube.

[0043] In order to optimize the above embodiment, the center tube forming machine also includes a guide track 46, which is arranged on the outer periphery of the outer ring cutter disc 45. When the driving mechanism 42 drives the outer ring cutter disc 45 to rotate, the guide track 46 can achieve guidance, thereby ensuring the movement accuracy of the outer ring cutter disc 45.

[0044] Here, the guide track 46 includes a plurality of arc-shaped limit blocks distributed along the circumference of the outer ring cutter disc 45. The arc-shaped limit blocks are used to limit the outer ring cutter disc 45. Any arc-shaped limit block is provided with a limit hole 47 that passes through along its thickness direction. When the outer ring cutter disc 45 rotates, the limit hole 47 enables the outer ring cutter disc 45 to move outward along the axial direction of the center tube. Of course, the connection between the outer ring cutter disc 45 and the limit hole 47 can be in a variety of different ways. For example, a connection can be provided in the limit hole 47. Screws, on the one hand, the connecting screws are used to connect the outer ring cutter disc 45 and the arc-shaped limit block; on the other hand, the movement of the outer ring cutter disc 45 can be achieved by sliding the connecting screws in the limit hole 47, and the hole length of the limit hole 47 determines the movement range of the outer ring cutter disc 45, that is, when the connecting screw is located on one side of the limit hole 47, the outer ring cutter disc 45 is in its original position, and when the connecting screw moves to the other side of the limit hole 47, the outer ring cutter disc 45 is at the farthest position from the fixed plate 41.

[0045] On the basis of the above, the driving mechanism 42 that drives the outer ring cutter disc 45 to move can be specifically set as a cylinder, which includes a cylinder seat and a telescopic rod. The telescopic rod is connected to the cylinder seat and is used for telescopic movement along the cylinder seat. The outer ring cutter disc 45 and the telescopic rod can be connected through a connecting rod 44 and a universal bearing 43. For example, a connecting rod 44 can be set on the top of the outer ring cutter disc 45, and the connecting rod 44 is set along the radial direction of the outer ring cutter disc 45. The universal bearing 43 is set at the end of the telescopic rod. The universal bearing 43 is used to connect the connecting rod 44 and the telescopic rod, so that the universal rotation of the connecting rod 44 relative to the telescopic rod can be realized.

[0046] In this way, when the telescopic rod is extended, the outer ring cutter disc 45 can rotate, and when the connecting rod 44 touches the guide track 46, under the action of the universal bearing 43, the outer ring cutter disc 45 can move along the axial direction of the center tube to the side away from the fixed plate 41.

[0047] The execution process of the above-mentioned center tube forming machine mainly includes: the sheet material 03 enters from the feed port 1 of the feeding mechanism, the sheet material 03 passes through two embossing rollers and embosses the required pattern before entering the folding mechanism 2, the sheet material 03 entering the folding mechanism 2 forms a fold with the left side facing downward and the right side facing upward at the folding position, the sheet material 03 that has passed the folding is spirally wound around the curling roller 31 on the curling and embracing mechanism 3 and the folded sheet material is buckled and extruded to form, thereby further forming a center tube, and then the center tube enters the cutting position, when the extended center tube length reaches a certain length (determined by demand), the driving mechanism 42 is started, driving the outer ring knife disc 45 to rotate in the guide track 46, and further making the cutting knife 53 progress toward the center direction of the center tube, and then, the driving motor 54 rotates and makes the two cutting knives 53 cut the center tube radially; finally, when the cutting is completed, the driving mechanism 42 is closed, the outer ring knife disc 45 is separated from the bearing connector 48, and the cutting knife 53 retreats under the elastic force of the elastic connector 52.

[0048] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0049] The central tube forming machine provided by the present invention is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A center tube forming machine, characterized in that: It comprises two cutting knives (53) for cutting a central tube in a radial direction, an outer ring cutter disc (45) coaxially arranged with the central tube and capable of pushing the two cutting knives (53) to progressively advance toward the center of the central tube, and a driving mechanism (42) connected to the outer ring cutter disc (45) and for driving the outer ring cutter disc (45) to move axially along the central tube; It also includes a guide track (46) disposed on the outer periphery of the outer ring cutter disc (45) and used to guide the outer ring cutter disc (45) when it moves; The guide track (46) comprises a plurality of arc-shaped limit blocks distributed along the circumference of the outer ring cutter disc (45) for limiting the outer ring cutter disc (45), and any of the arc-shaped limit blocks is provided with a limit hole (47) penetrating along the thickness direction thereof for allowing the outer ring cutter disc (45) to move outward along the axial direction of the center tube, and a connecting screw provided in the limit hole (47) for sliding along the limit hole (47); It also comprises two connecting shafts (51) which are parallel to each other and arranged in a horizontal direction and perpendicular to the central tube, the two connecting shafts (51) being arranged respectively at the upper and lower positions of the central tube, any one of the cutting knives (53) being connected to a knife body connecting member (50) which is sleeved on the two connecting shafts (51) and is used to drive the cutting knives (53) to move in a horizontal direction, the cutting knives (53) being fixed to a middle position of the knife body connecting member (50), the upper end of the knife body connecting member (50) being provided with a first connecting hole which is coaxially arranged with the connecting shaft (51) located above the central tube, and the lower end of the knife body connecting member (50) being provided with a second connecting hole which is coaxially arranged with the connecting shaft (51) located below the central tube; It also includes a vertically arranged fixing plate (41) for fixing the connecting shaft (51), and a bearing connecting member (48) for contacting the outer ring cutter disc (45) when the outer ring cutter disc (45) moves axially outward along the center tube, and a rotating connecting member (49) fixedly connected to the bearing connecting member (48) for pushing the cutter body connecting member (50) to move axially along the connecting shaft (51) when the outer ring cutter disc (45) contacts the bearing connecting member (48) and continues to move axially outward along the center tube.

2. The center tube forming machine according to claim 1, characterized in that: It also includes a driving motor (54) which is connected to the cutting knife (53) and is used to drive the cutting knife (53) to rotate and achieve cutting when the cutting knife (53) is advanced to a preset cutting position.

3. The center tube forming machine according to claim 1, characterized in that: The driving mechanism (42) includes a cylinder seat and a telescopic rod connected to the cylinder seat for telescopic movement along the cylinder seat, and also includes a connecting rod (44) arranged at the top of the outer ring cutter disc (45) and arranged along the radial direction of the outer ring cutter disc (45), and a universal bearing (43) arranged at the end of the telescopic rod for connecting the connecting rod (44) and the telescopic rod.

4. The center tube forming machine according to claim 3, characterized in that: The machine also includes a machine cover (01), wherein the interior of the machine cover (01) is provided with a feed port (1) for conveying a sheet material (03), a folding mechanism (2) connected to the feed port (1) and used for folding the sheet material (03), and a curling and rounding mechanism (3) connected to the folding mechanism (2) and used for curling the sheet material (03) to form a center tube, wherein the curling and rounding mechanism (3) includes a curling roller (31) coaxially arranged with the outer ring cutter disc (45) and used for conveying the center tube to the cutting station.

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