A paper bowl forming device

Abstract

This invention discloses a forming device for paper bowls. The clamping mechanism is located on the outer periphery of the paper sheet and includes two wrapping clamping arms that rotate and either clamp together or separate. The two wrapping clamping arms, when clamped together, form a cylindrical structure and cover the outer periphery of the paper tube. The two ends of the paper sheet along its circumferential direction are splicing parts and converge with the clamping action of the wrapping clamping arms. The bottom support is a horizontally extending plate-like structure located between the paper sheet clamp and the wrapping clamping arms and supported on the bottom wall of the paper sheet. Both ends of the bottom support extend along the circumferential direction of the paper sheet and extend beyond the two sides of the circumferential direction of the paper sheet. The interval between the wrapping clamping arms and the paper sheet clamp is adapted to the width of the bottom support. After the paper sheet is clamped to the clamping station by the paper sheet clamp, the paper sheet is directly laid on the bottom support to ensure that the paper sheet is in a horizontally unfolded state, avoiding unevenness of the paper sheet. When the wrapping clamping arms clamp the paper sheet, the deviation error is large, making it easy to lose grip or clamp crookedly, which affects the forming accuracy of the paper tube.

Description

Technical Field

[0001] This invention relates to the field of paper bowl manufacturing technology, and in particular to a paper bowl forming device. Background Technology

[0002] Paper cups, paper bowls, and paper lunch boxes are among the most vibrant green tableware of the 21st century. Since their introduction, paper tableware has been widely promoted and used in developed countries and regions such as Europe, America, Japan, Singapore, South Korea, and Hong Kong. Paper products are uniquely beautiful, environmentally friendly, hygienic, oil-resistant, and heat-resistant, and are also non-toxic, odorless, aesthetically pleasing, pleasant to the touch, biodegradable, and pollution-free. Paper tableware quickly gained acceptance upon entering the market due to its unique appeal. Paper cups (bowls) are paper containers made from chemically processed wood pulp paper (white cardboard) through mechanical processing and bonding. They are mainly divided into single-sided PE coated and double-sided PE coated types. Paper cup sizes are measured in ounces (OZ). In terms of shape and paper quality, the development has progressed from conical paper cups to waxed paper cups, then to straight-walled double-layered cups, and finally to polyethylene-coated paper cups. Currently, polyethylene-coated paper cups are the most commonly used, capable of holding both hot and cold beverages. Currently, cup body forming and cup bottom forming are generally performed in separate processes. Cup body forming takes place on the paper feeding platform, while cup bottom forming takes place on the indexing turntable. This results in a long production line with a large footprint, affecting the manufacturing cost and efficiency of paper cups. As market demand for paper cups continues to increase, the above production method can no longer meet market requirements in terms of price, efficiency, and other aspects. There is an urgent need to improve and upgrade the existing forming equipment.

[0003] The patent document with authorization publication number CN106696345B, entitled "Paper Cup and Bowl Forming Device and Method," describes a cup body forming mechanism including a cup body forming punch and cup body forming wrapping molds located on both sides of the cup body forming punch's axial direction. The cup body forming punch and the cup bottom traction punch are combined to form a cup body forming punch assembly. A paper sheet translation component is located in the area below the paper taking component and the cup body forming component, and moves the paper sheet to the bottom of the cup body forming component for forming along the radial direction of the cup body formed by the paper sheet. To avoid the two ends of the paper sheet drooping, which would cause the whole body to bend and make the cup body inaccurate during forming, the cup body forming wrapping mold must be able to abut against the bottom wall of the paper sheet after the paper sheet is delivered to the position, so that it remains in an extended state. However, it is not only necessary to ensure that the cup body forming wrapping mold is exactly aligned with the position of the paper sheet each time it is unfolded, but there are also requirements for the width of the cup body forming wrapping mold after it is unfolded, which increases the difficulty of setting up the cup body forming wrapping mold. Summary of the Invention

[0004] The purpose of this invention is to provide a paper bowl forming device to solve the problems existing in the prior art. After the paper sheet is clamped to the clamping station by the paper sheet clamp, the paper sheet is directly spread on the bottom to ensure that the paper sheet is in a horizontal state and avoids uneven paper sheets. When the wrapping clamp arm picks up the paper sheet, the deviation error is large, and it is easy to lose the grip or grab it crookedly, which affects the forming accuracy of the paper tube.

[0005] To achieve the above objectives, the present invention provides the following solution: The present invention provides a paper bowl forming device, including a clamping station for forming paper sheets into paper tubes. The clamping station is provided with a paper sheet clamp, a bottom support, and a clamping mechanism. The paper sheet clamp holds the paper sheet at its inner peripheral edge, and the clamping mechanism is located on the outer peripheral edge of the paper sheet. It includes two wrapping clamping arms that rotate to clamp or separate. The two wrapping clamping arms, when clamped, have a cylindrical structure and cover the outer peripheral side of the paper tube. The wrapping clamping arms are located along the paper... The paper sheet is arranged radially and spaced apart from the paper sheet clamp. The two ends of the paper sheet along its circumferential direction are splicing parts, and they come together with the closing action of the wrapping clamp arm and are stacked and glued together. The bottom support is a horizontally extending plate-like structure, which is located between the paper sheet clamp and the wrapping clamp arm and is supported on the bottom wall of the paper sheet. Both ends of the bottom support extend along the circumferential direction of the paper sheet and extend beyond the two sides of the circumferential direction of the paper sheet respectively. The interval between the wrapping clamp arm and the paper sheet clamp is adapted to the width of the bottom support.

[0006] Preferably, the clamping mechanism further includes a clamping body, one end of the page clamping arm is hinged to the clamping body, and the other end is connected to a telescopic mechanism that drives its rotation. A connecting rod is hinged between the telescopic mechanism and the page clamping arm.

[0007] Preferably, the paper sheet is equipped with an arc-shaped tray that supports it and transmits it circumferentially. The arc-shaped tray is provided with a receiving station and an edge heating station in sequence along the circumference. The receiving station is provided with a feeding mechanism that spreads the paper sheet on it. The edge heating station is provided with a pair of splicing part heating mechanisms that heat the two splicing parts respectively. The two splicing part heating mechanisms are respectively distributed for each splicing part. The clamping station is located on the discharge side of the end of the arc-shaped tray. The inner circle of the arc-shaped tray is provided with an intermittently rotating paper material turret mechanism. The paper material turret mechanism is provided with a plurality of paper sheet clamps that rotate with it and intermittently stop the paper sheet on the receiving station, the edge heating station and the clamping station.

[0008] Preferably, the clamping station has an intermittently rotating conical turret mechanism on one side along the horizontal direction. The conical turret mechanism has several conical dies arranged at equal intervals along the circumference. Each conical die rotates with the conical turret mechanism and stops intermittently at the clamping station. The paper sheet is clamped onto the conical die by the wrapping clamp arm. Each conical die has a pressing block at intervals on its outer periphery for pressing the splicing part. The pressing block is aligned with the two splicing parts after stacking and is movable along the radial direction of the paper tube.

[0009] Preferably, the outer periphery of the conical die turret mechanism is provided with a punching station, a bottom paper heating station, a clamping station, a cylinder bottom heating station, a recessed bottom station, a knurling station, and a cylinder exiting station in sequence along the direction of conical die movement. The conical die rotates with the conical die turret mechanism and moves sequentially to the punching station, the bottom paper heating station, the clamping station, the cylinder bottom heating station, the recessed bottom station, the knurling station, and the cylinder exiting station.

[0010] Preferably, the bottom punching station is equipped with a bottom punching mechanism, which includes a bottom paper conveyor belt and a limiting plate located at its output end. A bottom paper strip is conveyed on the bottom paper conveyor belt, extending beyond the output end of the bottom paper conveyor belt and slidably attached to the limiting plate. The limiting plate has a limiting hole coaxial with the conical die. A punch for punching the bottom paper strip to produce a bottom paper sheet is fitted into the limiting hole. The punch is located on the side of the limiting hole away from the conical die, and has a structure coaxial with the limiting hole. A ring cutter larger than the limiting hole is provided. The inner circumference of the ring cutter is provided with a push plate coaxial with the limiting hole. The push plate structure is smaller than the limiting hole and is coaxial with it. The punch reciprocates along the axial direction of the limiting hole. The end of the conical die near the limiting hole is provided with a bottom paper groove. The bottom paper sheet passes through the limiting hole with the push plate and is fitted into the bottom paper groove. The axis of the punch corresponds to the center line of the bottom paper strip, and the diameter of the punch is 1mm to 6mm larger than the width of the bottom paper strip.

[0011] Preferably, both the bottom paper heating station and the bottom tube heating station are provided with heating heads coaxial with the bottom paper groove. The heating heads are movable along the axis of the bottom paper groove, have a hollow structure and are connected to a hot air supply mechanism, and each of the two heating heads has a plurality of hot air outlet holes respectively aligned with the bottom paper sheet and the outer peripheral edge of the bottom end of the paper tube.

[0012] Preferably, the bottom-bending station is provided with a bottom-bending mechanism for bending the paper tube and the bottom paper sheet toward their inner periphery. The bottom-bending mechanism includes a bottom-bending frame, a bottom-bending moving part movably provided on the bottom-bending frame along the axis of the bottom paper groove, a bottom-bending forming part rotatably provided on the bottom-bending moving part, the rotating shaft of the bottom-bending forming part being coaxially arranged with the axis of the bottom paper groove, and a bottom-bending forming groove for nesting at the bottom end of the paper tube is provided on the side of the bottom paper groove, and a bottom-bending annular groove abutting against the edge of the bottom end of the paper tube is formed at the outer periphery of the bottom of the bottom-bending forming groove.

[0013] Preferably, the knurling station is provided with a knurling mechanism for pressing and knurling the bottom edge of the paper tube and the outer peripheral edge of the bottom paper sheet. The knurling mechanism includes a knurling frame, on which a knurling moving part is movably provided along the axis of the bottom paper groove. The knurling moving part is provided with a knurling forming part. On the side of the knurling forming part near the bottom paper groove, a knurling forming groove for nesting at the bottom of the paper tube is provided. An eccentric gear is rotatably provided at the bottom axis of the knurling forming groove. The rotation axis of the eccentric gear is coaxial with the bottom paper groove, and its outer tooth ring abuts against the bottom edge of the paper tube and the outer peripheral edge of the bottom paper sheet.

[0014] Preferably, one side of the conical mold turret mechanism is provided with a curling turret mechanism, and the curling turret mechanism is provided with a plurality of conical cylinders for fitting the paper tube. The conical cylinders are evenly distributed around the circumference of the curling turret mechanism. The outer periphery of the curling turret mechanism is provided with a tube receiving station and a cup-out station in sequence along the moving direction of the conical cylinder. When the conical mold and the conical cylinder are respectively located at the tube-out station and the tube-receiving station, they are coaxially connected. The bottom of the bottom paper groove is provided with an air blowing port for blowing out the paper tube. The bottom of the conical cylinder is provided with an air suction port for negative pressure to attract the paper tube. The cup-out station is provided with a negative pressure suction mechanism for negative pressure to attract out the paper cup.

[0015] The present invention achieves the following technical effects compared to the prior art:

[0016] First, after the paper sheet is clamped to the clamping station using the paper sheet clamp, the paper sheet is directly laid on the bottom to ensure that the paper sheet is in a horizontal state and avoids uneven paper sheets. When the wrapping clamp arm picks up the paper sheet, the deviation error is large, and it is easy to lose the grip or grab it crookedly, which affects the forming accuracy of the paper tube.

[0017] Secondly, after the paper sheet moves to the clamping station, the telescopic mechanism pushes the connecting rod, which moves and drives the arc-shaped clamping arm to rotate around its hinge point, so that the two arc-shaped clamping arms hug together and clamp the paper sheet, holding it around the outer peripheral wall of the cone mold, which is simple and effective.

[0018] Third, by setting up an arc-shaped tray, during the circumferential transmission of the paper sheet by the paper sheet clamping fixture in the paper turret mechanism, the paper sheet can be transferred along the arc-shaped tray to support it and keep it in an unfolded state. This facilitates precise heating of the paper sheet at the edge heating station and ensures the effectiveness of heating and subsequent bonding of the paper sheet at the receiving station.

[0019] Fourth, by setting up a conical mold turret mechanism and setting up several conical molds on the conical mold turret mechanism, the conical mold turret mechanism can be used to sequentially transport each conical mold to the clamping station, and the clamped paper tube can be transported to other stations for subsequent processing. Another conical mold can then be transported to the clamping station for the forming of the next paper tube, which effectively improves the processing efficiency of the entire paper tube. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a top view of the clamping station of the present invention;

[0022] Figure 2 This is a side view of the clamping station of the present invention;

[0023] Figure 3 This is a schematic diagram of the recessed bottom mechanism of the present invention;

[0024] Figure 4 This is a schematic diagram of the oiling mechanism of the present invention;

[0025] Figure 5 This is a schematic diagram of the bottom-punching mechanism of the present invention;

[0026] Figure 6 This is a schematic diagram of the heating mechanism of the present invention;

[0027] Figure 7 This is a schematic diagram of the knurling mechanism of the present invention;

[0028] Figure 8 This is a schematic diagram of the edge-rolling mechanism of the present invention;

[0029] Figure 9 This is a schematic diagram of the overall device structure of the present invention;

[0030] Figure 10 This is a schematic diagram of the paper-tapping mechanism of the present invention;

[0031] Figure 11 This is an isometric view of the clamping station of the present invention;

[0032] Among them, 1-conical die, 2-page clamping arm, 3-bottom support, 4-connecting rod, 5-pressure block, 6-bottom paper groove, 7-conical die turret mechanism, 8-bottom forming part, 9-bottom forming groove, 10-oiling positioning part, 11-oiling baffle, 12-cloth strip, 13-edge rolling turret mechanism, 14-conical cylinder, 15-bottom paper strip, 16-limiting plate, 17-ring cutter, 18-push plate, 19-limiting hole, 20-bottom punching mechanism, 21-hot air supply mechanism, 22-heating head, 23-hot air outlet, 24-knurling mechanism, 25-eccentric gear, 26-knurling forming groove, 27-rolling Flower forming section, 28-edge rolling plate, 29-edge rolling positioning section, 30-edge rolling mechanism, 31-bottom paper heating station, 32-bottom tube heating station, 33-paper material turret mechanism, 34-material receiving station, 35-extended paper feeder, 36-rotary paper suction mechanism, 37-clamping station, 38-bottom folding station, 39-knurling station, 40-bottom punching station, 41-oiling station, 42-first edge rolling station, 43-second edge rolling station, 44-bowl ejection station, 45-material conveying pipe, 46-bottom paper conveyor belt, 47-paper tapping mechanism, 48-cylinder, 49-paper sheet clamp, 50-arc tray. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] The purpose of this invention is to provide a paper bowl forming device to solve the problems existing in the prior art. After the paper sheet is clamped to the clamping station by the paper sheet clamp, the paper sheet is directly spread on the bottom to ensure that the paper sheet is in a horizontal state and avoids uneven paper sheets. When the wrapping clamp arm picks up the paper sheet, the deviation error is large, and it is easy to lose the grip or grab it crookedly, which affects the forming accuracy of the paper tube.

[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figures 1 to 11As shown, this embodiment provides a paper bowl forming device, wherein the paper bowl is a paper noodle container or paper cup, etc., including a clamping station 37 for forming paper sheets into paper tubes, wherein the paper sheets have a fan-shaped structure so that they can form a conical cylindrical structure after clamping. The clamping station 37 is provided with a paper sheet clamp 49, a bottom support 3, and a clamping mechanism. The paper sheet clamp 49 clamps the inner peripheral edge of the paper sheet, and the clamping mechanism is located on the outer peripheral edge side of the paper sheet. It includes two wrapping clamp arms 2 that rotate and clamp or separate. The two wrapping clamp arms 2 after clamping have a cylindrical structure and cover the outer peripheral side of the paper tube. Specifically, the paper bowl or paper cup produced is generally a conical cylindrical structure, so the clamping mechanism is used to form the paper tube. The combined wrapping arm 2 has a conical cylindrical structure adapted to the paper sheet, and is spaced apart from the paper sheet clamp 49 along the radial direction of the paper sheet. The two ends of the paper sheet along its circumferential direction are splicing parts, which come together with the wrapping arm 2 as it closes, and are stacked and glued together. The base 3 has a horizontally extending plate-like structure, which is located between the paper sheet clamp 49 and the wrapping arm 2, and is supported on the bottom wall of the paper sheet. Both ends of the base 3 extend along the circumferential direction of the paper sheet, and extend beyond the two sides of the circumferential direction of the paper sheet to ensure the length of the base 3. The interval between the wrapping arm 2 and the paper sheet clamp 49 is adapted to the width of the base 3 to fully guarantee the width of the base 3. Specifically, the base 3 is installed on the frame of the entire paper bowl forming equipment and kept in a fixed position. After the paper sheet is clamped to the clamping station 37 using the paper sheet clamp 49, the paper sheet is directly laid out on the base 3 to ensure that the paper sheet is in a horizontal and unfolded state. This avoids uneven paper sheets, which could lead to a large deviation error when the wrapping arm 2 picks up the paper sheet, making it easy to lose grip or grip it crookedly, thus affecting the forming accuracy of the paper tube. Alternatively, preferably, an air blowing auxiliary device can be set at the clamping station 37. After the paper sheet is clamped to the clamping station 37 by the paper sheet clamp 49, the air blowing auxiliary device can be used to blow the paper sheet up, keeping it in a horizontal and unfolded state. Then, the clamping mechanism wraps the paper sheet onto the conical mold 1 with the bottom paper sheet.

[0037] The clamping mechanism also includes a clamping body. One end of the wrapping clamp arm 2 is hinged to the clamping body, and the other end is connected to a telescopic mechanism that drives its rotation. A connecting rod 4 is hinged between the telescopic mechanism and the wrapping clamp arm 2. After the paper moves to the clamping station 37, the telescopic mechanism pushes the connecting rod 4. The connecting rod 4 moves and drives the arc-shaped clamping arm to rotate around its hinge point, so that the two arc-shaped clamping arms hug together and clamp the paper, holding it around the outer peripheral wall of the cone mold 1. This is simple and effective.

[0038] Furthermore, the paper sheet is equipped with an arc-shaped tray 50 that supports it and transfers it circumferentially. The arc-shaped tray 50 has a receiving station 34 and an edge heating station arranged sequentially along its circumference. The receiving station 34 has a feeding mechanism for spreading the paper sheet on it. The edge heating station has paired heating mechanisms for heating the two splicing sections, respectively. These two heating mechanisms are distributed corresponding to each splicing section to heat the splicing section of the paper sheet. The splicing section includes the splicing edge of the paper sheet along its circumference and the areas near both ends of the splicing edge. After the paper sheet is transferred to the clamping station 37, the two splicing sections of the paper sheet overlap and bond together through clamping. It should be noted that during the coating process of the base paper before forming, a coating is formed on its surface. Heating ensures that the PE coating on the paper sheet softens, and the two splicing sections are bonded together through the softened PE coating. The clamping station 37 is located on the discharge side at the end of the arc-shaped pallet 50. After the paper sheet rotates to the clamping station 37, it is no longer restricted by the arc-shaped pallet 50 and moves onto the base 3, thus avoiding the restriction of the clamping mechanism by the arc-shaped pallet 50. An intermittently rotating paper turret mechanism 33 is provided on the inner circle of the arc-shaped pallet 50. The paper turret mechanism 33 has several paper sheet clamps 49 that rotate with it and intermittently stop the paper sheet at the receiving station 34, the edge heating station, and the clamping station 37. Preferably, the paper sheet is stored on the extended paper feeder 35 and vacuum-adsorbed and rotated by the suction rod of the rotating paper suction mechanism 36 to the fan-shaped paper sheet pushing mechanism. The pushing plate of the paper sheet pushing mechanism reciprocates, pushing the suctioned paper sheet onto the arc-shaped pallet 50 that matches the paper turret mechanism 33. Preferably, the extended paper feeder 35 is equipped with a paper-tapping mechanism 47 for neatly tapping stacked paper sheets. The paper-tapping mechanism 47 has a cylinder 48 telescopic rod, the end of which is connected to a pressure plate. The pressure plate presses against the side of the stacked paper sheets. This ensures that the paper sheets are flat and aligned after being placed on the extended paper feeder 35, facilitating subsequent clamping by the paper sheet clamp 49.

[0039] The inner peripheral edge structure of the preferred support 3 is adapted to the paper turret mechanism 33, preferably an arc-shaped structure, so that the support 3 extends circumferentially along the paper turret mechanism 33, so as to reduce the impact on the rotation of the paper turret mechanism 33 while fully supporting the paper.

[0040] Furthermore, the clamping station 37 has an intermittently rotating conical turret mechanism 7 on one side along the horizontal direction. The conical turret mechanism 7 has several conical dies 1 spaced evenly along the circumference. Each conical die 1 rotates with the conical turret mechanism 7 and intermittently stops at the clamping station 37. The paper sheet is clamped onto the conical die 1 by the wrapping clamp arm 2. Each conical die 1 has pressure blocks 5 spaced apart on its outer periphery for pressing the spliced ​​parts. The pressure blocks 5 are aligned with the two stacked spliced ​​parts and are movable along the radial direction of the paper tube. By pressing the stacked spliced ​​parts together with the pressure blocks 5, and because the spliced ​​parts are heated, they are tightly bonded together after pressing.

[0041] Furthermore, the outer periphery of the conical die turret mechanism 7, along the direction of movement of the conical die 1, is sequentially equipped with a punching station 40, a bottom paper heating station 31, a clamping station 37, a tube bottom heating station 32, a recessed bottom station 38, a knurling station 39, and a tube exit station. The conical die 1 rotates with the conical die turret mechanism 7 and moves sequentially to the punching station 40, the bottom paper heating station 31, the clamping station 37, the tube bottom heating station 32, the recessed bottom station 38, the knurling station 39, and the tube exit station. The intermittent rotation of the paper material turret mechanism 33 and the conical die turret mechanism 7 ensures the processing and transmission of the paper tube.

[0042] In a preferred embodiment of the present invention, a bottom-punching mechanism 20 is provided at the bottom-punching station 40. The bottom-punching mechanism 20 includes a bottom paper conveyor belt 46 and a limiting plate 16 located at its output end. A bottom paper strip 15 is conveyed on the bottom paper conveyor belt 46. The bottom paper strip 15 extends out of the output end of the bottom paper conveyor belt 46 and slides onto the limiting plate 16. A limiting hole 19 coaxial with the cone die 1 is provided on the limiting hole 19. A punch for punching the bottom paper strip 15 to produce a bottom paper sheet is provided in the limiting hole 19. Located on the side of the limiting hole 19 away from the cone die 1, there is an annular cutter 17 that is coaxial with the limiting hole 19 and has a structure larger than the limiting hole 19. The inner circumference of the annular cutter 17 is provided with a push plate 18 that is coaxial with the limiting hole 19. The push plate 18 has a structure smaller than the limiting hole 19 and is coaxial with it. The punch moves back and forth along the axial direction of the limiting hole 19. The end of the cone die 1 near the limiting hole 19 is provided with a bottom paper groove 6. The bottom paper passes through the limiting hole 19 with the push plate 18 and is fitted into the bottom paper groove 6. The punching mechanism 20 is equipped with a bottom paper holder. The bottom paper strip 15 is placed on the bottom paper holder and sent to the punching mechanism 20 by the rollers of the bottom paper feeding mechanism. The bottom paper strip 15 is cut into a circular bottom paper piece by the cooperation of the annular cutter 17 and the limiting plate 16. Then, it is moved to the limiting hole 19 by the push plate 18. The limiting hole 19 blocks the outer edge of the bottom paper piece, so that the bottom paper piece forms a bowl-shaped structure and is sent into the bottom paper groove 6 by the push plate 18.

[0043] In a preferred embodiment of the present invention, the axis of the punch corresponds to the center line of the bottom paper strip 15, and the diameter of the punch is 1mm to 6mm larger than the width of the bottom paper strip 15. It should be noted that in the prior art, the punch structure is generally smaller than the width of the bottom paper strip 15 when punching the bottom paper strip 15. Therefore, the circular hole left after punching the bottom paper strip 15 has two edges on each side. In the present invention, by adjusting the diameter of the punch to be smaller than the bottom paper strip 15, even if notches are formed on both sides of the punched bottom paper sheet, it does not affect the bottoming formation between the bottom paper sheet and the paper tube. For example, in the prior art... The bottom paper strip 15 is 128mm wide. After punching, it forms a circular bottom paper sheet with a diameter of 126mm, leaving a 2mm edge. When folding the bottom, the outer 6mm edge of the circular bottom paper sheet with a diameter of 126mm is folded. In one embodiment, the width of the bottom paper strip 15 is set to 122mm, forming a circular bottom paper sheet with a diameter of 126mm with 2mm gaps on both sides. However, when folding the edge, the outer 6mm edge of the circular bottom paper sheet is folded, leaving at least 4mm of width, which is sufficient to ensure the area for folding and bonding, reducing waste and lowering costs.

[0044] Furthermore, both the bottom paper heating station 31 and the bottom paper heating station 32 are equipped with heating heads 22 coaxial with the bottom paper groove 6. The heating heads 22 are movable along the axial direction of the bottom paper groove 6, and have a hollow structure connected to a hot air supply mechanism 21. Each of the two heating heads 22 has several hot air outlets 23 that are respectively aligned with the bottom paper sheet and the outer peripheral edge of the bottom end of the paper tube. The hot air outlets 23 are evenly spaced around the side wall of the heating head 22 in the circumferential direction. The conical mold turret mechanism 7 rotates the conical mold 1 and the bottom paper sheet to the bottom paper heating station 31. The heating heads 22 extend into the bottom paper groove 6 along the axial direction of the bottom paper groove 6. After preheating the inner peripheral edge of the bottom paper sheet, the conical mold turret mechanism 7 continues to rotate to the clamping station 37. Subsequently, the conical turret mechanism 7 continues to rotate the conical mold 1 and the bottom paper sheet to the bottom heating station 32, where the inner circumference of the bottom of the paper tube and the bottom paper sheet are heated a second time to fully soften the PE film on the bottom paper sheet and the paper tube. After heating, it is rotated and conveyed to the bottom mechanism to ensure the effectiveness of the bonding between the two.

[0045] Furthermore, at the bottom-bending station 38, a bottom-bending mechanism is provided to bend the paper tube and bottom paper sheet towards their inner periphery. The bottom-bending mechanism includes a bottom-bending frame, a bottom-bending moving part movably mounted on the bottom-bending frame along the axis of the bottom paper groove 6, and a drive mechanism for driving the bottom-bending mechanism to rotate and translate. A bottom-bending forming part 8 is rotatably mounted on the bottom-bending moving part. The rotating shaft of the bottom-bending forming part 8 is coaxially arranged with the axis of the bottom paper groove 6, and a bottom-bending forming groove 9 for nesting at the bottom end of the paper tube is provided on the side of the bottom paper groove 6. A bottom-bending annular groove is formed at the outer periphery of the bottom of the bottom-bending forming groove 9, which abuts against the bottom edge of the paper tube. The bottom-bending forming groove 9 is engaged with the bottom end of the paper tube, and the bottom edge of the paper tube is fitted into the bottom-bending annular groove. As the bottom-bending forming groove 9 rotates and translates, the bottom end of the paper tube is gradually bent towards its inner periphery, and the outer periphery of the bottom paper sheet is fitted into the annular gap between the bent edge and the inner wall of the paper tube.

[0046] Furthermore, a knurling mechanism 24 is provided at knurling station 39 for pressing and knurling the bottom edge of the paper tube and the outer peripheral edge of the bottom paper sheet. The knurling mechanism 24 includes a knurling frame, on which a knurling moving part is movably provided along the axis of the bottom paper groove 6. A knurling forming part 27 is provided on the knurling moving part. On the side of the knurling forming part 27 near the bottom paper groove 6, a knurling forming groove 26 for nesting at the bottom of the paper tube is provided. An eccentric gear 25 is rotatably provided at the bottom axis of the knurling forming groove 26. The rotation axis of the eccentric gear 25 is coaxial with the bottom paper groove 6, and its outer tooth ring abuts against the bottom edge of the paper tube and the outer peripheral edge of the bottom paper sheet. The knurling forming groove 26 of the knurling mechanism 24 covers the outer peripheral wall of the bottom of the paper tube. Then, by rotating the eccentric gear 25, it rolls the edge of the paper tube and the outer peripheral edge of the bottom paper sheet circumferentially during the rotation process, thereby achieving the purpose of bonding the paper tube and the bottom paper sheet.

[0047] Furthermore, a curling turret mechanism 13 is provided on one side of the conical turret mechanism 7. The curling turret mechanism 13 is provided with several conical cylinders 14 for connecting paper tubes. The conical cylinders 14 are evenly distributed around the circumference of the curling turret mechanism 13. The outer periphery of the curling turret mechanism 13 is provided with a tube receiving station and a cup-out station 44 in sequence along the moving direction of the conical cylinders 14. When the conical mold 1 and the conical cylinder 14 are located at the tube-out station and the tube receiving station respectively, they are coaxially connected. The bottom of the bottom paper groove 6 is provided with an air blowing port for blowing out paper tubes. The bottom of the conical cylinder 14 is provided with an air suction port for negative pressure to attract paper tubes. The cup-out station 44 is provided with a negative pressure attraction mechanism for negative pressure to attract paper cups. The negative pressure attraction mechanism is used to attract the paper cups on the conical cylinder 14 and suck them into the material conveying pipe 45 connected to the negative pressure attraction mechanism for the next process. After the knurling is completed, at the tube receiving station, the cone die 1 and the cone tube 14 are coaxially connected. Air is blown onto the paper tube through the air blowing port to make it detach from the cone die 1. The cone tube 14 is equipped with a negative pressure suction mechanism to attract the paper tube and make it embed into the cone tube 14, thus completing the transfer of the paper tube.

[0048] Specifically, an oiling station 41 and an edge-rolling station are provided between the receiving station and the unloading station 44. An oiling mechanism is provided at the oiling station 41. The oiling mechanism has an oiling positioning part 10, which is a conical cylindrical structure and embedded in the paper tube. An oiling baffle 11 is connected to the side of the oiling positioning part 10 away from the paper tube. The oiling baffle 11 restricts the position of the paper tube. An annular cloth strip 12 is provided at the edge of the paper tube opening corresponding to the oiling positioning part 10. Specifically, the cloth strip 12 is provided at the angle between the oiling positioning part 10 and the oiling baffle 11. An oil supply mechanism is provided inside the oiling positioning part 10. An oil supply pipe is connected between the oil supply mechanism and the cloth strip 12. Lubricating oil is soaked on the cloth strip 12 through the oil supply mechanism and the oil supply pipe. The oiling mechanism also has a drive mechanism to drive the oiling positioning part 10 to rotate. The cloth strip 12 rotates with the oiling positioning part 10 and slides in contact with the edge of the paper tube opening to apply lubricating oil to the edge of the paper tube opening.

[0049] Furthermore, the edge-rolling station is divided into a first edge-rolling position 42 and a second edge-rolling position 43, each equipped with an edge-rolling mechanism 30. Each edge-rolling mechanism 30 has an edge-rolling positioning part 29 and an edge-rolling plate 28 located away from the paper tube. The edge-rolling positioning part 29 extends into the paper tube for positioning. The edge-rolling plate 28 has an annular groove that abuts against the edge of the paper tube opening. The edge-rolling mechanism 30 is equipped with a drive mechanism that drives the edge-rolling positioning part 29 and the edge-rolling plate 28 to rotate. The annular groove rotates with the drive mechanism and gradually presses against the edge of the paper tube opening, causing it to roll outwards. By providing two edge-rolling mechanisms 30, the edge of the paper tube opening can be rolled to the appropriate degree.

[0050] Any adaptive changes made according to actual needs are within the scope of protection of this invention.

[0051] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0052] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A paper bowl forming device, characterized in that, The device includes a clamping station for forming paper sheets into paper tubes. The clamping station is equipped with a paper sheet clamp, a base, and a clamping mechanism. The paper sheet clamp is held at the inner peripheral edge of the paper sheet. The clamping mechanism is located at the outer peripheral edge of the paper sheet and includes two wrapping arms that can rotate and then clamp or separate. The two wrapping arms, when clamped, have a cylindrical structure and cover the outer peripheral side of the paper tube. The wrapping arms are spaced apart from the paper sheet clamp along the radial direction of the paper sheet. The two ends of the paper sheet along its circumferential direction are splicing parts, which converge and are stacked and glued together as the wrapping arms clamp. The base is a horizontally extending plate-like structure located between the paper sheet clamp and the wrapping arms and supported on the bottom wall of the paper sheet. Both ends of the base extend along the circumferential direction of the paper sheet and extend beyond the two circumferential edges of the paper sheet. The gap between the wrapping arms and the paper sheet clamp is adapted to the width of the base. The clamping station has an intermittently rotating conical turret mechanism on one side along the horizontal direction. The conical turret mechanism has several conical dies that are equally spaced along the circumference. Each conical die rotates with the conical turret mechanism and stops intermittently at the clamping station. The paper sheet is clamped onto the conical die by the wrapping clamp arm. Each conical die has a pressing block at intervals on its outer periphery for pressing the splicing part. The pressing block is aligned with the two splicing parts after stacking and is movable along the radial direction of the paper tube. The outer periphery of the conical die turret mechanism is provided with a punching station, a bottom paper heating station, a clamping station, a cylinder bottom heating station, a recessed bottom station, a knurling station, and a cylinder exit station in sequence along the direction of conical die movement. The conical die rotates with the conical die turret mechanism and moves sequentially to the punching station, the bottom paper heating station, the clamping station, the cylinder bottom heating station, the recessed bottom station, the knurling station, and the cylinder exit station. The bottom punching station is equipped with a bottom punching mechanism, which includes a bottom paper conveyor belt and a limiting plate located at its output end. A bottom paper strip is conveyed on the bottom paper conveyor belt, extending beyond the output end of the bottom paper conveyor belt and slidably attached to the limiting plate. The limiting plate has a limiting hole coaxial with the conical die. A punch for punching the bottom paper strip to produce a bottom paper sheet is fitted into the limiting hole. The punch is located on the side of the limiting hole away from the conical die, and has a structure coaxial with the limiting hole and larger than... The annular cutter of the limiting hole has a push plate coaxial with the limiting hole on its inner circumference. The push plate is smaller than the limiting hole and is coaxial with it. The punch reciprocates along the axial direction of the limiting hole. The end of the conical die near the limiting hole has a bottom paper groove. The bottom paper sheet passes through the limiting hole with the push plate and is fitted into the bottom paper groove. The axis of the punch corresponds to the center line of the bottom paper strip, and the diameter of the punch is 1mm to 6mm larger than the width of the bottom paper strip.

2. The paper bowl forming equipment according to claim 1, characterized in that, The clamping mechanism also includes a clamping body. One end of the page clamping arm is hinged to the clamping body, and the other end is connected to a telescopic mechanism that drives its rotation. A connecting rod is hinged between the telescopic mechanism and the page clamping arm.

3. The paper bowl forming equipment according to claim 2, characterized in that, The paper sheet is equipped with an arc-shaped tray that supports it and transmits it circumferentially. The arc-shaped tray is provided with a receiving station and a joint heating station in sequence along the circumference. The receiving station is provided with a feeding mechanism that spreads the paper sheet on it. The joint heating station is provided with a pair of joint heating mechanisms that heat the two joint parts respectively. The two joint heating mechanisms are respectively distributed for each joint part. The clamping station is located on the discharge side of the end of the arc-shaped tray. The inner circle of the arc-shaped tray is provided with an intermittently rotating paper turret mechanism. The paper turret mechanism is provided with a number of paper sheet clamps that rotate with it and intermittently stop the paper sheet at the receiving station, the joint heating station and the clamping station.

4. The paper bowl forming equipment according to claim 3, characterized in that, Both the bottom paper heating station and the bottom tube heating station are equipped with heating heads coaxial with the bottom paper groove. The heating heads are movable along the axis of the bottom paper groove, have a hollow structure and are connected to a hot air supply mechanism, and each of the two heating heads has a number of hot air outlet holes that are respectively aligned with the bottom paper sheet and the outer peripheral edge of the bottom end of the paper tube.

5. The paper bowl forming equipment according to claim 4, characterized in that, The bottom-bending station is equipped with a bottom-bending mechanism for bending the paper tube and the bottom paper sheet toward their inner periphery. The bottom-bending mechanism includes a bottom-bending frame, a bottom-bending moving part that is movably provided on the bottom-bending frame along the axis of the bottom paper groove, a bottom-bending forming part that is rotatably provided on the bottom-bending moving part, the rotating shaft of the bottom-bending forming part being coaxially arranged with the axis of the bottom paper groove, and a bottom-bending forming groove for nesting at the bottom end of the paper tube is provided on the side of the bottom paper groove. A bottom-bending annular groove that abuts against the edge of the bottom end of the paper tube is opened at the outer periphery of the bottom of the bottom-bending forming groove.

6. The paper bowl forming equipment according to claim 5, characterized in that, The knurling station is equipped with a knurling mechanism for pressing and knurling the bottom edge of the paper tube and the outer peripheral edge of the bottom paper sheet. The knurling mechanism includes a knurling frame, on which a knurling moving part is movably provided along the axis of the bottom paper groove. The knurling moving part is provided with a knurling forming part. On the side of the knurling forming part near the bottom paper groove, there is a knurling forming groove for nesting at the bottom of the paper tube. An eccentric gear is rotatably provided at the bottom axis of the knurling forming groove. The rotation axis of the eccentric gear is coaxial with the bottom paper groove, and its outer tooth ring abuts against the bottom edge of the paper tube and the outer peripheral edge of the bottom paper sheet.

7. The paper bowl forming equipment according to claim 6, characterized in that, One side of the conical mold turret mechanism is provided with a curling turret mechanism. The curling turret mechanism is provided with a plurality of conical cylinders for fitting the paper tube. The conical cylinders are evenly distributed around the circumference of the curling turret mechanism. The outer circumference of the curling turret mechanism is provided with a tube receiving station and a bowl exiting station in sequence along the moving direction of the conical cylinder. When the conical mold and the conical cylinder are respectively located at the tube exiting station and the tube receiving station, they are coaxially connected. The bottom of the bottom paper groove is provided with an air blowing port for blowing out the paper tube. The bottom of the conical cylinder is provided with an air suction port for negative pressure to attract the paper tube. The bowl exiting station is provided with a negative pressure suction mechanism for negative pressure to attract out the paper bowl.

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