A paper cup bottoming mechanism and a paper cup processing system

Abstract

The application discloses a paper cup nest bottom mechanism and a paper cup processing system, and belongs to the technical field of paper cup processing. The paper cup nest bottom mechanism comprises a nest bottom die base capable of rotating, a plurality of nest bottom blades are arranged on the nest bottom die base, a slope surface for guiding the inward bending of a cup barrel sidewall and a limiting surface for limiting the bent cup barrel sidewall are arranged on the nest bottom blade, the slope surface is inclined from high to low in the same direction as the rotating direction of the nest bottom die base, the limiting surface is connected with the slope surface in a smooth transition mode, the limiting surface is located on one side of the bending direction of the cup barrel sidewall, the distance between the limiting surface and the cup barrel inner wall gradually decreases in the reverse direction of the rotating direction of the nest bottom die base. The nest bottom mechanism can not only form a small hook structure which is bent inward, but also can exert extrusion force on the small hook structure, reduce the distance between the small hook structure and the cup barrel, improve the nest bottom effect, and reduce the risk of water leakage of the formed paper cup. In addition, the nest bottom mechanism can be used to adapt to paper cups of different specifications without replacing the nest bottom die, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of paper cup processing technology, and in particular to a paper cup bottom-gathering mechanism and a paper cup processing system. Background Technology

[0002] During the paper cup forming process, the bottom of the cup tube needs to be recessed to eliminate the gap between the cup tube and the bottom of the cup and prevent the paper cup from leaking. Existing technology, such as the utility model patent with application number 201920284925.1, has an annular groove on the recessing mold base for recessing the bottom of the paper lid side wall. The recessing of the paper lid is achieved by driving the annular groove to move upward. This recessing method has the following problems: 1) The annular groove is fixedly set on the recessing mold base. When different sizes of paper cups need to be recessed, it is necessary to replace the recessing mold base with a recessing groove of different sizes. This is not only costly, but also cumbersome to operate; 2) This structure can only recess an inwardly bent flange. There is a large distance between the flange and the cup tube. If the subsequent knurling pressure is too small, it may cause the paper cup to leak.

[0003] The utility model with application number 202221078675.4 has a bottom wheel assembly on the bottom wheel seat. The bottom wheel assembly has a bottom wheel assembly with outward bottom wheels and a bottom wheel assembly with inward bottom wheels. In use, different bottom wheel assemblies are selected according to the bottom diameter of the paper cup, which solves the problem of needing to change different bottom mold seats according to the specifications of the paper cups produced. However, there is still a large distance between the inwardly bent edge and the cup cylinder, and there is still a risk of water leakage from the paper cup.

[0004] In summary, there is an urgent need to design a paper cup bottom-feeding mechanism and paper cup processing system that can apply extrusion force to the inwardly bent flange during the bottom-feeding process, reduce the distance between the flange and the cup cylinder, improve the bottom-feeding effect, and reduce the risk of paper cup leakage. Summary of the Invention

[0005] The purpose of this invention is to address the defects and shortcomings of the prior art by providing a paper cup concave bottom mechanism and a paper cup processing system. This system can not only form a small inwardly bent hook structure, but also apply extrusion pressure to the small hook structure to reduce the distance between the small hook structure and the cup cylinder, thereby improving the concave bottom effect and reducing the risk of water leakage after the paper cup is formed.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] This invention provides a paper cup concave bottom mechanism, including a rotatable concave bottom mold base. The concave bottom mold base is provided with a plurality of concave bottom blades. The concave bottom blades are provided with a slope for guiding the cup cylinder sidewall to bend inward and a limiting surface for limiting the bent cup cylinder sidewall. The slope from high to low is inclined in the same direction as the rotation direction of the concave bottom mold base. The limiting surface is smoothly connected to the slope. The limiting surface is located on one side of the cup cylinder sidewall bending direction and in the opposite direction of the rotation direction of the concave bottom mold base. The distance between the limiting surface and the inner wall of the cup cylinder gradually decreases.

[0008] Preferably, the radial position of the bottom-mounted blade on the bottom-mounted mold base is adjustable, and the relative position of the adjusted bottom-mounted blades with the side wall of the cup remains consistent.

[0009] Preferably, the mold base is provided with a groove adapted to the mold blade, the mold blade is disposed in the groove, the length direction of the groove is along the radial direction of the mold base, and the side of the mold base is provided with a through hole for fasteners to pass through to press the mold blade, the axial direction of the through hole is perpendicular to or intersects the side of the mold blade.

[0010] Preferably, the through hole is a round hole with a diameter adapted to the fastener or an elongated hole with a width adapted to the fastener;

[0011] Preferably, both the slope and the limiting surface are smoothly transitioned arc surfaces;

[0012] The present invention also provides a paper cup processing system including the aforementioned paper cup bottom-feeding mechanism, comprising a cup tube forming mechanism for rolling a fan-shaped paper sheet into a cup tube, a cup bottom forming mechanism for forming a cup bottom, and an assembly mechanism for assembling the cup tube and the cup bottom. The assembly mechanism includes an intermittently rotating main turret, on which a conical mold adapted to the paper cup is provided. The conical mold is provided with adsorption holes for adsorbing the cup tube and the cup bottom. A heating station, a bottom-feeding station, and a knurling station are sequentially provided along the rotation direction of the main turret. An intermittently rotating secondary turret is provided at the end of the knurling station. The secondary turret is sequentially provided with a rim forming station, a detection station, and a cup dispensing station. The secondary turret is located at the bottom of the main turret and is provided with a plurality of conical holes for holding paper cups. The conical holes near the knurling station can be located directly below the conical mold.

[0013] Preferably, the heating station is provided with a liftable first heating seat and a second heating seat. The side wall of the first heating seat is provided with a first heating hole for heating the bottom wall of the cup, and the side wall of the second heating seat is provided with a second heating hole for heating the bottom of the cup. The axial height of the first heating hole is lower than the axial height of the second heating hole.

[0014] Preferably, the main turret is provided with a flipping mechanism near the end of the cup forming mechanism. The flipping mechanism has a cup receiving station for receiving the formed cup and a cup suction station for adsorbing the formed cup onto the conical mold. The cup receiving station and the cup suction station are perpendicular to each other or intersect each other. The flipping mechanism includes a rotating part that can switch between the cup receiving station and the cup suction station. The rotating part flips intermittently, and the flipping frequency of the rotating part is adapted to the rotation frequency of the conical mold.

[0015] Preferably, the cup dispensing station is provided with a finished product channel for conveying qualified paper cups and a defective product channel for conveying unqualified paper cups. The finished product channel and the defective product channel are respectively covered above two of the conical holes. The lower part of the finished product channel and the defective product channel is respectively provided with a pushing mechanism for feeding paper cups into the finished product channel or the defective product channel. The pushing mechanism has a telescopic rod that can extend or shorten according to the signal of the control device. The control device is connected to the detection device set at the detection station. The control device extends or shortens the telescopic rod according to the signal fed back by the detection device.

[0016] Preferably, the paper cup processing system further includes a cup-supporting mechanism to prevent the paper cup from tilting. The cup-supporting mechanism has at least one roller that can abut against the side wall of the cup cylinder, and the contact surface between the roller and the side wall of the cup cylinder is a smooth arc surface.

[0017] The present invention achieves the following technical effects compared to the prior art:

[0018] 1. The recessed bottom mechanism of this invention can not only form a small hook structure that bends inward, but also apply extrusion pressure to the small hook structure, reduce the distance between the small hook structure and the cup cylinder, improve the recessed bottom effect, and reduce the risk of water leakage in the paper cup after forming.

[0019] 2. The bottom-feeding mechanism of this invention can also adjust the radial position of the bottom-feeding blade as needed to adapt to paper cups of different specifications. Compared with the prior art of changing different bottom-feeding molds or bottom-feeding wheel sets, it not only reduces the process of changing bottom-feeding molds or bottom-feeding wheel sets and improves production efficiency, but also saves the space for placing bottom-feeding molds or bottom-feeding wheel sets of different specifications and the production and manufacturing of bottom-feeding molds or bottom-feeding wheel sets of different specifications. That is, by using the bottom-feeding mechanism of this application, production and manufacturing costs can be greatly reduced.

[0020] 3. The present invention heats the bottom of the cup at the first heating station and the cup cylinder at the second heating station, which reduces the number of heating times for the cup cylinder and the bottom of the cup. Compared with the heating method of heating the bottom and the cup cylinder twice each, it can avoid the problem of the bottom being scalded and producing defective products due to excessive heating heat.

[0021] 4. This invention sets up finished product channels and defective product channels respectively, and connects the blower mechanisms of the finished product channels and defective product channels to the control device. The control device is connected to the detection device, so that the control device can control the start and stop of different blower mechanisms according to the detection results, so as to realize the purpose of transporting qualified products and defective products to different storage stations. Compared with the existing technology where visually unqualified products need to be manually picked, this invention greatly improves production efficiency. Attached Figure Description

[0022] 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.

[0023] Figure 1 A schematic diagram showing the fit between the cup holder and the recessed mold.

[0024] Figure 2 A schematic diagram showing the fit between the cup base ring and the recessed mold.

[0025] Figure 3 This is a schematic diagram of the structure of the blade at the bottom of the hole;

[0026] Figure 4 This is a schematic diagram of the fit between the cup barrel and the cup bottom when the bottom is not recessed.

[0027] Figure 5 This is a schematic diagram of the fit between the cup cylinder and the cup bottom after the cup is recessed.

[0028] Figure 6 This is a side view of the bottom mold structure.

[0029] Figure 7 This is a schematic diagram of the overall structure of the paper cup processing system;

[0030] Figure 8 This is a partial structural diagram of a paper cup processing system.

[0031] Figure 9 This is a partial structural diagram of the paper cup processing system from another angle;

[0032] Figure 10 This is a top view of the structure of the first heating base and the second heating base;

[0033] Figure 11 This is a schematic diagram of the cross-sectional structure at point AA;

[0034] Figure 12 This is a schematic diagram of the flipping mechanism when it is in the cup-suction station.

[0035] Figure 13 A schematic diagram of the flipping mechanism when it is located at the cup receiving station.

[0036] The components include: 1. Die base; 2. Die blade; 3. Cup cylinder; 4. Slope; 5. Limiting surface; 6. Small hook structure; 7. Slide groove; 8. Through hole; 9. Cup cylinder forming mechanism; 10. Cup bottom; 11. Cup bottom forming mechanism; 12. Assembly mechanism; 13. Main turret; 14. Conical die; 15. Heating station; 16. Die base station; 17. Knurling station; 18. Secondary turret; 19. Roll forming station; 20. Inspection station; 21. Cup ejection station; 22. Conical hole; 23. First heating seat; 24. Second heating seat; 25. First heating hole; 26. Second heating hole; 27. Roller; 28. Tilting mechanism; 29. ​​Receiving block; 30. Annular groove; 31. Connecting plate; 32. Rotating shaft; 33. Finished product channel; 34. Defective product channel. Detailed Implementation

[0037] 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.

[0038] 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.

[0039] like Figures 1 to 6As shown, the present invention provides a paper cup concave bottom mechanism, including a rotatable concave bottom mold base 1. The concave bottom mold base 1 is provided with a plurality of concave bottom blades 2. Each concave bottom blade 2 has a slope 4 for guiding the sidewall of the cup cylinder 3 to bend inwards and a limiting surface 5 for limiting the sidewall of the cup cylinder 3 after bending. The slope 4 has an inclination direction from high to low that is in the same direction as the rotation direction of the concave bottom mold base 1. The limiting surface 5 is smoothly connected to the slope 4. The limiting surface 5 is located on one side of the bending direction of the sidewall of the cup cylinder 3, opposite to the rotation direction of the concave bottom mold base 1. The limiting surface 5 is connected to the cup cylinder 3... The distance between the inner walls gradually decreases; during operation, the bottom mold base 1 rotates and moves upward, and the bottom edge of the cup cylinder 3 bends inward along the inclined slope 4. Under the action of the limiting surface 5, the inwardly bent edge moves upward along the limiting surface 5 to form a small hook structure 6. As the bottom mold base 1 rotates, the distance between the limiting surface 5 and the inner wall of the cup cylinder 3 gradually decreases, and the squeezing force applied by the limiting surface 5 to the small hook structure 6 gradually increases. Under the action of the gradually increasing squeezing force, the distance between the small hook structure 6 and the inner wall of the cup cylinder 3 gradually decreases. Along the rotation direction of the bottom mold base 1, the limiting surface 5 is a smoothly transitioned arc surface. Along the height direction, when the lateral position remains unchanged, the radius of curvature of the limiting surface 5 at different heights remains consistent. The height of the limiting surface 5 is not lower than the height of the formed small hook structure 6. The limiting surface 5 can uniformly apply extrusion force to the small hook structure 6 in the height direction, thereby improving the forming consistency of the small hook structure 6 in the height direction. In order to improve the smoothness of the inward bending of the bottom edge of the cup cylinder 3, the slope surface 4 is set as a smoothly transitioned arc surface.

[0040] The radial position of the bottom-dip blade 2 on the bottom-dip mold base 1 is adjustable. After adjustment, the relative positions of the bottom-dip blades 2 and the side wall of the cup cylinder 3 are consistent. By adjusting the radial position of the bottom-dip blades 2 on the bottom-dip mold base 1, the bottom-dip mechanism can adapt to different sizes of paper cups without changing the bottom-dip molds of different specifications. This not only saves the process of changing the bottom-dip molds and is easy to operate, but also eliminates the need to prepare multiple sizes of bottom-dip molds, greatly saving production costs.

[0041] In a preferred embodiment of the present invention, the bottom mold base 1 is provided with a groove 7 adapted to the bottom blade 2. The bottom blade 2 is disposed in the groove 7. The length direction of the groove 7 is along the radial direction of the bottom mold base 1. The side of the bottom mold base 1 is provided with a through hole 8 for fasteners to pass through to press the bottom blade 2. The axial direction of the through hole 8 is perpendicular to or intersects the side of the bottom blade 2. When adapting to different sizes of paper cups, the fastener is first loosened, and the bottom blade 2 is pushed to slide in the groove 7. When it slides to a suitable position, the fastener is tightened again, and the position of the bottom blade 2 is fixed by the compressive force applied by the fastener. The through hole 8 can be a round hole with a diameter adapted to the fastener, or it can be an elongated hole with a width adapted to the fastener. If the through hole 8 is a round hole, multiple through holes 8 need to be provided on the side of the bottom mold base 1 to adapt to different sizes of paper cups. Preferably, the axial direction of the through hole 8 is perpendicular to the side of the bottom blade 2 to increase the compressive force applied by the fastener to the bottom blade 2 and ensure the fixing effect of the bottom blade 2. Of course, when the axial direction of the through hole 8 intersects with the side of the bottom blade 2, the fastener can also apply compressive force to the bottom blade 2 to fix the bottom blade 2. However, the compressive force applied in this form is less than the compressive force applied by the fastener to the bottom blade 2 when the axial direction of the through hole 8 is perpendicular to the side of the bottom blade 2.

[0042] like Figures 7 to 13 The present invention also provides a paper cup processing system including a paper cup bottom mechanism, comprising a cup cylinder forming mechanism 9 for rolling a fan-shaped paper sheet into a cup cylinder 3, a cup bottom forming mechanism 11 for forming a cup bottom 10, and an assembly mechanism 12 for assembling the cup cylinder 3 and the cup bottom 10. The assembly mechanism 12 includes a main turret 13 that rotates intermittently. The main turret 13 is provided with a conical die 14 adapted to the paper cup. The conical die 14 is provided with adsorption holes for adsorbing the cup cylinder 3 and the cup bottom 10. The main tower 13 has a heating station 15, a bottom-feeding station 16, and a knurling station 17 arranged sequentially in the direction of rotation. At the end of the knurling station 17 is a secondary tower 18 that rotates intermittently. The secondary tower 18 has a rolling forming station 19, an inspection station 20, and a cup dispensing station 21 arranged sequentially. The secondary tower 18 is located at the bottom of the main tower 13. The secondary tower 18 has several conical holes 22 for holding paper cups. The conical holes 22 near the knurling station 17 can be located directly below the conical mold 14.

[0043] During operation, the fan-shaped paper sheet is conveyed by the paper feeding mechanism and passes through the edge heating device. The edge heating device heats the edge of the fan-shaped paper sheet. After edge heating, the fan-shaped paper sheet is clamped at the die head by the clamping mechanism to form a cup shape. Then, the edge of the fan-shaped paper sheet is pressed down by the ultrasonic die head to make the edge of the fan-shaped paper sheet tightly bonded to form the cup 3. The formed cup 3 is then adsorbed onto the side of the conical die 14. The bottom paper is fed to the punching mechanism by the rollers of the bottom paper feeding mechanism. The punching mechanism cuts the bottom paper into a circular paper sheet. The circular paper sheet is formed into a cup bottom 10 by the punch and the bottom paper forming die. The formed cup bottom 10 is adsorbed onto the bottom surface of the conical die 14. The cup 3 and the cup bottom 10 are sequentially rotated with the conical die 14 to the heating station 15, the bottom-feeding station 16, and the knurling station 17. At the heating station 15, the bottom edge of the cup 3 and the cup bottom 10 are heated respectively. At the bottom-feeding station 16, the heated bottom edge of the cup 3 and the cup bottom 10 are heated respectively. The cup cylinder 3 has an inwardly curved hook structure 6 at the bottom. The eccentric knurling wheel rotates at the knurling station 17 to roll the hook structure 6, thereby achieving the bonding between the cup cylinder 3 and the cup bottom 10. After the cup cylinder 3 and the cup bottom 10 are bonded, the paper cup is rotated to the crimping station 19 by the cone die 14. The suction force of the cone die 14 is paused, allowing the paper cup to fall into the corresponding conical hole 22 at the crimping station 19. The paper cup that falls into the conical hole 22 is first rotated to the cup mouth lubrication station to apply silicone oil to the cup mouth. Then, under the action of the crimping die, the cup mouth is crimped. When the crimped paper cup is rotated to the inspection station 20, the inspection head is inserted into the paper cup to inspect it. The inspected paper cup is transferred to the cup receiving station 21 through the cup exit station. The cup receiving station has an automatic counting function. When the paper cups are stacked according to the set number, they are sent out and manually collected, bagged, and boxed to complete the processing of the paper cups.

[0044] In a preferred embodiment of the present invention, the heating station 15 is provided with a liftable first heating seat 23 and a second heating seat 24. The side wall of the first heating seat 23 is provided with a first heating hole 25 for heating the bottom wall of the cup cylinder 3, and the side wall of the second heating seat 24 is provided with a second heating hole 26 for heating the bottom of the cup 10. The axial height of the first heating hole 25 is lower than the axial height of the second heating hole 26. By setting the second heating hole 26 on the side wall of the second heating seat 24, compared with setting the second heating hole 26 on the top surface of the second heating seat 24, the problem of the cup bottom 10 being deviated due to hot air blowing directly onto the bottom of the cup 10, which affects the quality of the bottom of the paper cup, can be avoided.

[0045] The paper cup processing system of the present invention is further provided with a cup-supporting mechanism to prevent the paper cup from tilting. The cup-supporting mechanism has at least one roller 27 that can abut against the side wall of the cup cylinder 3. The contact surface between the roller 27 and the side wall of the cup cylinder 3 is a smooth arc surface. As the first heating seat 23 and the second heating seat 24 move up and down, the cup cylinder 3 may tilt, affecting the heating effect on the bottom edge of the cup cylinder 3. Therefore, the present application provides a cup-supporting mechanism to support the cup cylinder 3 with the roller 27, so as to avoid the cup cylinder 3 from tilting and improve the heating effect on the bottom edge of the cup cylinder 3.

[0046] Cup-supporting mechanisms can be installed at the bottom-forming station 16, the knurling station 17, and the roll forming station 19. These mechanisms can be installed on the main turret 13 and the secondary turret 18, or at any of the aforementioned stations requiring cup support. Regardless of their location, the cup-supporting mechanisms must not obstruct the rotation of the conical die 14 or the conical hole 22. In a preferred embodiment, the cup-supporting mechanisms are located on the left and right sides of the rotation path of the conical die 14 and the conical hole 22. If the cup-supporting mechanisms are installed on the main turret 13 and the secondary turret 18, a foldable connecting mechanism is provided on the bottom surface of the main turret 13 and the secondary turret 18. This connecting mechanism can be a linkage structure or other feasible structures. Rollers 27 are installed on the connecting... In terms of the connecting mechanism, when rotating to a station requiring cup support, the connecting mechanism extends so that the roller 27 can support the cup 3. When rotating to a station where cup support is not required, the connecting mechanism folds to the top of the main turret 13 and the secondary turret 18 to prevent interference between the cup support mechanism and the equipment at the station where cup support is not required, thus avoiding disruption to the normal operation of other stations. If the cup support mechanism is installed at each station requiring cup support, a connecting rod is installed on the worktable, the roller 27 is mounted on the connecting rod, and the position of the connecting rod is adjusted so that when the cup 3 rotates to the station requiring cup support, the cup 3 can abut against the roller 27. At this time, guide arc surfaces can be provided at both the front and rear ends of the roller 278 along the rotation direction of the cup 3 to facilitate the cup 3 rotating in or out. One roller 27 can be installed, or multiple rollers can be installed as needed.

[0047] The main turret 13 is provided with a flipping mechanism 28 near the end of the cup forming mechanism 9. The flipping mechanism 28 has a cup receiving station for receiving the formed cup and a cup suction station for adsorbing the formed cup onto the conical mold 14. The cup receiving station and the cup suction station are perpendicular to each other or intersect each other. The flipping mechanism 28 includes a rotating part that can switch between the cup receiving station and the cup suction station. The rotating part flips intermittently, and the flipping frequency of the rotating part is adapted to the rotation frequency of the conical mold 14. The rotating part includes a receiving block 29 for receiving the cup 3. The receiving block 29 is provided with an annular groove 30 adapted to the bottom of the cup 3. The receiving block 29 is fixedly mounted on the rotating shaft 32 through a connecting plate 31. The rotating shaft 32 is connected to a drive motor. The drive motor is connected to a control device. The control device controls the drive motor to rotate forward and backward, so that the receiving block 29 rotates to the cup receiving station or the cup suction station.

[0048] The cup dispensing station 21 is equipped with a finished product channel 33 for conveying qualified paper cups and a defective product channel 34 for conveying unqualified paper cups. The finished product channel 33 and the defective product channel 34 are respectively covered above two conical holes 22. The lower part of the finished product channel 33 and the defective product channel 34 are respectively equipped with a pushing mechanism for feeding paper cups into the finished product channel 33 or the defective product channel 34. The pushing mechanism has a telescopic rod that can extend or shorten according to the signal of the control device. The control device is connected to the detection device set in the detection station 20. The control device extends or shortens the telescopic rod according to the signal fed back by the detection device. The pushing mechanism can be any structure with a telescopic rod that can extend or shorten according to the signal of the control device. As a preferred embodiment of the present invention, the pushing mechanism is a cylinder. Specifically, when the detection device detects that a certain paper cup is qualified, the control device controls the pushing mechanism to feed the qualified paper cup into the cylinder. When a paper cup is transferred to the finished product channel 33, the telescopic rod at the finished product channel 33 is extended to push the qualified paper cup into the finished product channel 33. Under the negative pressure adsorption in the finished product channel 33, it is transported to the cup receiving station. At this time, the telescopic rod at the defective product channel 34 is in a retracted state, which does not affect the normal operation of other stations in the secondary turret 18. When the detection device detects that a paper cup is unqualified, the control device controls the pushing mechanism to extend the telescopic rod at the defective product channel 34 when the unqualified paper cup is transferred to the defective product channel 34. The unqualified paper cup is pushed into the defective product channel 34. Under the negative pressure adsorption in the defective product channel 34, it is transported to the defective product area for centralized manual processing. At this time, the telescopic rod at the finished product channel 33 is in a retracted state, which does not affect the normal operation of other stations in the secondary turret 18. Specifically, the end of the telescopic rod in the retracted state does not protrude from the upper end face of the conical hole 22.

[0049] 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 above exemplary embodiments, and that the present 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 exemplary 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, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A paper cup bottom indentation mechanism, characterized in that: The device includes a rotatable mold base with several mold blades. Each mold blade has a slope for guiding the cup sidewall to bend inward and a limiting surface for limiting the bent cup sidewall. The slope has an inclination direction from high to low that is in the same direction as the rotation direction of the mold base. The limiting surface is smoothly connected to the slope. The limiting surface is located on one side of the cup sidewall bending direction and gradually decreases the distance between the limiting surface and the inner wall of the cup along the opposite side of the rotation direction of the mold base. Both the slope and the limiting surface are smoothly transitioned arc surfaces.

2. The paper cup indentation mechanism according to claim 1, characterized in that: The radial position of the bottom-mounted blade on the bottom-mounted mold base is adjustable, and the relative position of the several bottom-mounted blades with the side wall of the cup remains consistent after adjustment.

3. The paper cup indentation mechanism according to claim 2, characterized in that: The mold base is provided with a groove that matches the blade. The blade is disposed in the groove. The length of the groove is along the radial direction of the mold base. The side of the mold base is provided with a through hole for fasteners to pass through to press the blade. The axial direction of the through hole is perpendicular to or intersects with the side of the blade.

4. The paper cup indentation mechanism according to claim 3, characterized in that: The through hole is a round hole with a diameter that matches the fastener or an elongated hole with a width that matches the fastener.

5. A paper cup processing system comprising the paper cup indentation mechanism as described in any one of claims 1 to 4, characterized in that: The device includes a cup forming mechanism for rolling fan-shaped paper sheets into cup tubes, a cup bottom forming mechanism for forming cup bottoms, and an assembly mechanism for assembling the cup tubes and cup bottoms. The assembly mechanism includes an intermittently rotating main turret with a conical die adapted to the paper cup. The conical die has adsorption holes for adsorbing the cup tube and cup bottom. A heating station, a bottom-feeding station, and a knurling station are sequentially arranged along the rotation direction of the main turret. At the end of the knurling station is an intermittently rotating secondary turret with a rolling mouth forming station, an inspection station, and a cup dispensing station sequentially arranged. The secondary turret is located at the bottom of the main turret and has several conical holes for holding paper cups. The conical holes near the knurling station are located directly below the conical die.

6. The paper cup processing system according to claim 5, characterized in that: The heating station is provided with a first heating seat and a second heating seat that can be raised and lowered. The side wall of the first heating seat is provided with a first heating hole for heating the bottom wall of the cup, and the side wall of the second heating seat is provided with a second heating hole for heating the bottom of the cup. The axial height of the first heating hole is lower than the axial height of the second heating hole.

7. The paper cup processing system according to claim 5, characterized in that: The main turret is provided with a flipping mechanism near the end of the cup forming mechanism. The flipping mechanism has a cup receiving station for catching the formed cup and a cup suction station for adsorbing the formed cup onto the conical mold. The cup receiving station and the cup suction station are perpendicular to each other or intersect each other. The flipping mechanism includes a rotating part that can switch between the cup receiving station and the cup suction station. The rotating part flips intermittently, and the flipping frequency of the rotating part is adapted to the rotation frequency of the conical mold.

8. The paper cup processing system according to claim 5, characterized in that: The cup dispensing station is equipped with a finished product channel for conveying qualified paper cups and a defective product channel for conveying unqualified paper cups. The finished product channel and the defective product channel are respectively covered above two of the conical holes. The lower part of the finished product channel and the defective product channel is respectively equipped with a pushing mechanism for feeding paper cups into the finished product channel or the defective product channel. The pushing mechanism has a telescopic rod that can extend or shorten according to the signal of the control device. The control device is connected to the detection device set at the detection station. The control device extends or shortens the telescopic rod according to the signal fed back by the detection device.

9. The paper cup processing system according to claim 5, characterized in that: The paper cup processing system also includes a cup-supporting mechanism to prevent the paper cup from tilting. The cup-supporting mechanism has at least one roller that can abut against the side wall of the cup cylinder, and the contact surface between the roller and the side wall of the cup cylinder is a smooth arc surface.

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