Composite die structure for hot-press sealing of bottom of paper cup

Abstract

The invention provides a composite die structure for hot-press sealing of the bottom of a paper cup, and belongs to the technical field of paper cup manufacturing equipment.The composite die structure comprises a machining table, a lifting plate, an upper die module and a driving module are arranged in the machining table, the lifting plate is connected with a rotating column and a motor, and a movable frame is arranged on one side of the lifting plate; the lower die module comprises a preheating station, a bottom rolling station, a heat sealing station assembly and an edge rolling station. The heat sealing station assembly is connected with a sleeve and a supporting frame. The sealing device has the beneficial effects that the whole lap joint circumference of the cup body and the cup bottom is evenly covered with the sealing wheel in a revolution and rotation combined motion mode, local virtual sealing, dislocation or uneven pressure is avoided, it is ensured that the sealing face is compact and free of leakage, the abrasion state of the sealing wheel is monitored in real time through the sealing wheel, the ball, the reset block and the pressure sensor, timely replacement is reminded, and the service life of the sealing wheel is prolonged. Sealing failure caused by excessive abrasion of the sealing wheel is avoided, and unqualified products are reduced.

Description

Technical Field

[0001] This invention relates to the field of paper cup manufacturing equipment technology, and more specifically, to a composite mold structure for hot-press sealing of the bottom of a paper cup. Background Technology

[0002] China's Packaging Industry Development Plan points out that the packaging industry should further promote the integration of informatization and industrialization, enhance digital empowerment, and further focus on key core technologies in areas such as green development, advanced processes, system integration, and intelligent manufacturing to carry out independent and collaborative innovation. In existing disposable paper cup production, the paper cup forming process mainly includes steps such as coating, slitting, printing, die-cutting, forming, and packaging.

[0003] In the current disposable paper cup production process, the bottom heat-sealing process generally uses an eccentric wheel for single-sided extrusion. This method has many technical drawbacks. For example, the single-sided driving characteristic of the eccentric wheel means that the sealing force may not be able to evenly cover the entire overlapping circumference of the cup body and bottom. This can easily lead to excessive local pressure that crushes the paper base, or insufficient local pressure that results in a false seal. At the same time, the lateral force generated by extrusion can cause relative misalignment between the cup body and bottom, resulting in seal line deviation and uneven width, which in turn leads to poor sealing surface density and a high risk of leakage. In addition, the existing technology does not facilitate real-time monitoring of the wear condition of the eccentric wheel. Problems can only be detected by manually sampling defective products, which can easily lead to the production of batches of defective products. Furthermore, the eccentricity needs to be recalibrated after wear, making the operation and maintenance process complex and costly. How to invent a composite mold structure for heat-sealing the bottom of paper cups to solve these problems has become an urgent problem for those skilled in the art. Summary of the Invention

[0004] To overcome the above shortcomings, this invention provides a composite mold structure for hot-press sealing of the bottom of a paper cup, aiming to solve the problems of excessive local pressure crushing the paper base and insufficient local pressure causing a false seal when the eccentric wheel seal is used. At the same time, the lateral force generated by extrusion will cause the cup body and the bottom of the cup to be misaligned, resulting in poor sealing surface density.

[0005] This invention is implemented as follows: This invention provides a processing table, the interior of which is provided a lifting plate, an upper mold module, and a drive module. The lifting plate is connected to a rotating column and a motor, and a movable frame is provided on one side of the lifting plate. It also includes: The lower mold module is located inside the processing table. The lower mold module includes a preheating station, a bottom rolling station, a heat sealing station assembly, and an edge rolling station. The heat sealing station assembly is connected to a sleeve and a support frame. The heat sealing station assembly is used to seal the bottom of the paper cup.

[0006] Preferably, the lifting plate is fixedly connected to the lower die module, the lower die module is located between the upper die module and the lifting plate, the lifting plate is respectively in transmission connection with the rotating column and the motor, and the lower end of the lifting plate is rotatably connected to one end of the movable frame.

[0007] Preferably, the heat-sealing station component includes an upper cover, a receiving ring and a bearing seat. The receiving ring is located between the upper cover and the bearing seat, and the receiving ring is respectively detachably connected to the upper cover and the bearing seat. A plurality of tooth teeth distributed in a circumferential array are fixedly connected to the inner wall of the upper cover, and a fixing ring is sleeved on the outer wall of the bearing seat. The fixing ring is detachably connected to the lifting plate.

[0008] Preferably, an inner cylinder seat is provided inside the bearing seat. The bearing seat and the inner cylinder seat are rotatably connected through a bearing. The outer wall of the inner cylinder seat is fixedly connected to a sleeve, and a piston column is slidably connected inside the inner cylinder seat.

[0009] Preferably, the piston column is connected with a limiting rod. The limiting rod is slidably limited on the inner wall of the inner cylinder seat. One end of the piston column located outside the inner cylinder seat is fixedly connected to a fixing seat. The fixing seat is fixedly connected to the movable frame. A buffer spring is sleeved on the outer wall of the inner cylinder seat. Two ends of the buffer spring respectively abut against the fixing seat and the side wall of the inner cylinder seat.

[0010] Preferably, the heat-sealing station component further includes a top rod. The top rod is slidably limited with the inner cylinder seat. One end of the top rod contacts the piston column. The other end of the top rod is fixedly connected to a convex block. A plurality of limiting slot holes distributed in a circumferential array are formed on the side wall of the convex block, and an extrusion block is installed on the inner wall of the limiting slot hole.

[0011] Preferably, the support frame is sleeved on the outside of the top rod, and one end of the support frame is fixedly connected to the inner cylinder seat.

[0012] Preferably, the heat-sealing station component further includes a moving frame. The moving frame is arranged in a "C" shape. A rotating rod is rotatably connected to the side wall of the moving frame. One end of the rotating rod is fixedly connected to a gear disk meshed with the tooth teeth, and a sealing wheel is fixedly connected to the outer wall of the rotating rod.

[0013] Preferably, one end of the moving frame is fixedly connected to a sliding rod. One end of the sliding rod is respectively slidably connected to the limiting slot hole, the extrusion block and the support frame. A telescopic spring is sleeved on the outer wall of the sliding rod. Two ends of the telescopic spring are respectively fixedly connected to the flank of the moving frame and the outer wall of the support frame.

[0014] Preferably, the side wall of the movable frame is provided with a mounting groove, and a pressure sensor is fixedly connected to the inner wall of the mounting groove away from the opening. A reset block and a reset spring are provided inside the mounting groove. The reset block is slidably connected to the inner wall of the mounting groove. The reset spring is sleeved on the outside of the reset block. The two ends of the reset spring are fixedly connected to the inner wall of the mounting groove and the side wall of the reset block, respectively. The reset block is T-shaped, and a ball bearing is rotatably connected to the end of the reset block away from the pressure sensor.

[0015] The beneficial effects of this invention are: 1. In this invention, the heat sealing station assembly uses a force transmission structure consisting of a piston rod, a push rod, and a slide rod to convert the axial driving force into the radial clamping force of the sealing wheel. Combined with a compound motion mode of revolution and rotation, the gear disk meshes with the teeth of the upper cover to achieve rotation, while the inner cylinder seat drives the moving frame to achieve revolution. This ensures that the sealing wheel evenly covers the entire overlapping circumference of the cup body and the cup bottom, avoiding localized incomplete sealing, misalignment, or uneven pressure, and ensuring a dense and leak-free sealing surface.

[0016] 2. This invention uses a feedback mechanism involving a sealing wheel, ball bearings, a reset block, and a pressure sensor to monitor the wear status of the sealing wheel in real time. When the wear reaches a critical value, the background system automatically issues an alarm to remind the user to replace the sealing wheel in time, thus preventing sealing failure due to excessive wear and reducing the production of defective products. After replacing the sealing wheel, the reset spring automatically pushes the reset block to reset, and the pressure sensor detection value returns to the normal threshold. No manual recalibration is required, which reduces the difficulty of equipment debugging and maintenance and improves operation and maintenance efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of a composite mold structure for hot-press sealing of the bottom of a paper cup, provided by an embodiment of the present invention. Figure 2 This is a schematic diagram of the internal structure of a processing table for a composite mold structure for hot-press sealing the bottom of a paper cup, provided in an embodiment of the present invention. Figure 3 This is a schematic diagram of the upper and lower mold module structures of a composite mold structure for hot-press sealing of the bottom of a paper cup provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of the rear structure of the drive module of a composite mold structure for hot-press sealing of the bottom of a paper cup, provided in an embodiment of the present invention. Figure 5 This is a schematic diagram of the bottom structure of the lower mold module of a composite mold structure for hot-press sealing of the bottom of a paper cup, provided in an embodiment of the present invention. Figure 6 This is a schematic diagram of the front structure of the drive module of a composite mold structure for hot-press sealing of the bottom of a paper cup, provided in an embodiment of the present invention. Figure 7 This is a schematic diagram of a lifting plate structure for a composite mold structure for hot-press sealing of the bottom of a paper cup, provided by an embodiment of the present invention. Figure 8 This is a schematic diagram of the heat-sealing station component structure of a composite mold structure for hot-press sealing of the bottom of a paper cup, provided by an embodiment of the present invention. Figure 9 This is a schematic diagram of the bottom structure of a heat-sealing station component of a composite mold structure for hot-press sealing of the bottom of a paper cup, provided by an embodiment of the present invention. Figure 10 This is a half-sectional view of the heat-sealing station component of a composite mold structure for hot-pressing and sealing the bottom of a paper cup, provided by an embodiment of the present invention. Figure 11 This invention provides a composite mold structure for heat-sealing the bottom of a paper cup. Figure 10 Enlarged schematic diagram of the structure at point A in the middle; Figure 12 This invention provides a composite mold structure for heat-sealing the bottom of a paper cup. Figure 10 Enlarged schematic diagram of the structure at point B; Figure 13 This is a schematic diagram of the top rod structure of a composite mold structure for hot-press sealing of the bottom of a paper cup, provided by an embodiment of the present invention; Figure 14 This is a schematic diagram of the support frame structure of a composite mold structure for hot-press sealing of the bottom of a paper cup, provided by an embodiment of the present invention; Figure 15 This is a schematic diagram of the movable frame half-section structure of a composite mold structure for hot-press sealing of the bottom of a paper cup, provided by an embodiment of the present invention.

[0019] In the diagram: 1. Processing table; 2. Lifting plate; 3. Lower mold module; 31. Preheating station; 32. Bottom rolling station; 33. Heat sealing station assembly; 331. Top cover; 332. Receiving ring; 333. Bearing seat; 334. Fixing ring; 335. Fixing seat; 336. Buffer spring; 337. Piston column; 338. Limiting rod; 339. Push rod; 3391. Protrusion; 3392. Limiting slot; 3393. Extrusion block; 3310. Inner cylinder seat; 33 11. Moving frame; 3312. Slide rod; 3313. Telescopic spring; 3314. Gear disk; 3315. Tooth; 3316. Sealing wheel; 3317. Rotating rod; 3318. Ball bearing; 3319. Pressure sensor; 3320. Mounting slot; 3321. Return spring; 3322. Return block; 34. Hemming station; 4. Upper mold module; 5. Rotating column; 6. Motor; 7. Drive module; 8. Movable frame; 9. Sleeve; 10. Support frame. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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, 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. Example

[0021] Reference Figures 1-15 The system includes a processing table 1, which contains a lifting plate 2, an upper mold module 4, and a drive module 7. The lifting plate 2 is connected to a rotating column 5 and a motor 6. A movable frame 8 is provided on one side of the lifting plate 2. The system also includes: The lower mold module 3 is located inside the processing table 1. The lower mold module 3 includes a preheating station 31, a bottom rolling station 32, a heat sealing station assembly 33, and an edge rolling station 34. The heat sealing station assembly 33 is connected to a sleeve 9 and a support frame 10. The heat sealing station assembly 33 is used to seal the bottom of the paper cup.

[0022] Furthermore; the lifting plate 2 is fixedly connected to the lower mold module 3, the lower mold module 3 is located between the upper mold module 4 and the lifting plate 2, the lifting plate 2 is connected to the rotating column 5 and the motor 6 respectively, and the lower end of the lifting plate 2 is rotatably connected to one end of the movable frame 8; the heat sealing station assembly 33 includes an upper cover 331, a receiving ring 332 and a bearing seat 333, the receiving ring 332 is located between the upper cover 331 and the bearing seat 333, the receiving ring 332 is detachably connected to the upper cover 331 and the bearing seat 333 respectively, the inner wall of the upper cover 331 is fixedly connected with a number of teeth 3315 distributed in a circular array, the outer wall of the bearing seat 333 is fitted with a fixing ring 334, and the fixing ring 334 is detachably connected to the lifting plate 2.

[0023] It should be noted that: The fixing ring 334 adopts a ring structure and is tightly fitted on the outer wall of the support seat 333 of the heat sealing station component 33. It is detachably fixed to the lifting plate 2 by bolts and other fasteners, forming a rigid connection system. This connection method can completely restrict the radial movement and circumferential rotation of the heat sealing station component 33 in the horizontal direction, and prevent it from shifting or shaking due to structural loosening during movement. The lifting plate 2 serves as the support base of the lower mold module 3, and the rotating column 5 and the motor 6 are connected by gears and gear chains. This is existing technology and therefore not described in detail. Its lifting and rotation actions need to be accurately transmitted to the heat sealing station component 33. The fixing ring 334 fully fits the connection surface between the support seat 333 and the lifting plate 2, constructing an efficient force transmission path. The rigid connection between the fixing ring 334 and the lifting plate 2 forms a reliable limiting constraint, which can effectively resist the external interference force on the heat sealing station component 33 during operation.

[0024] The heat-sealing station component 33 does not work independently. It needs to work in coordination with the preheating station 31, bottom rolling station 32, and edge rolling station 34 of the lower mold module 3. The internal sub-components (such as piston column 337, push rod 339, and moving frame 3311) need to be precisely linked. The connection between the fixing ring 334 and the lifting plate 2 makes the heat-sealing station component 33 and the lower mold module 3 form a unified motion whole. When the lifting plate 2 drives the lower mold module 3 to rise and fall as a whole, the heat-sealing station component 33 can maintain a fixed distance from other stations to avoid the relative positional displacement between stations affecting the paper cup flow accuracy. At the same time, this fixing method provides a stable reference platform for the force transmission inside the component (such as piston column 337 driving push rod 339, gear disk 3314 and teeth 3315 meshing transmission), ensuring that the linkage action of each sub-component is precise and controllable, and ultimately ensuring the consistency and reliability of heat sealing. The up and down lifting process of the lifting plate 2 is existing technology and will not be described in detail.

[0025] Reference Figures 8-13, Further, an inner cylinder seat 3310 is provided inside the carrier seat 333. The carrier seat 333 and the inner cylinder seat 3310 are rotationally connected by a bearing. The outer wall of the inner cylinder seat 3310 is fixedly connected to the sleeve 9. A piston rod 337 is slidably connected inside the inner cylinder seat 3310. The piston rod 337 is connected to a limiting rod 338. The limiting rod 338 is slidably limited to the inner wall of the inner cylinder seat 3310. One end of the piston rod 337 outside the inner cylinder seat 3310 is fixedly connected to a fixed seat 335. The fixed seat 335 is fixedly connected to the movable frame 8. A buffer spring 336 is sleeved on the outer wall of the inner cylinder seat 3310. Both ends of the buffer spring 336 are respectively abutted against the fixed seat 335 and the side wall of the inner cylinder seat 3310. The heat-sealing station assembly 33 further includes a top rod 339. The top rod 339 is slidably limited to the inner cylinder seat 3310. One end of the top rod 339 is in contact with the piston rod 337. The other end of the top rod 339 is fixedly connected to a convex block 3391. A plurality of limiting slot holes 3392 distributed in a circumferential array are provided on the side wall of the convex block 3391. An extrusion block 3393 is installed on the inner wall of the limiting slot hole 3392. The support frame 10 is sleeved on the outside of the top rod 339. One end of the support frame 10 is fixedly connected to the inner cylinder seat 3310. The heat-sealing station assembly 33 further includes a moving frame 3311. The moving frame 3311 is arranged in a "C" shape. A rotating rod 3317 is rotatably connected to the side wall of the moving frame 3311. One end of the rotating rod 3317 is fixedly connected to a gear disk 3314 meshed with the tooth 3315. A sealing wheel 3316 is fixedly connected to the outer wall of the rotating rod 3317. One end of the moving frame 3311 is fixedly connected to a sliding rod 3312. One end of the sliding rod 3312 is respectively slidably connected to the limiting slot hole 3392, the extrusion block 3393 and the support frame 10. A telescopic spring 3313 is sleeved on the outer wall of the sliding rod 3312. Both ends of the telescopic spring 3313 are respectively fixedly connected to the flank of the moving frame 3311 and the outer wall of the support frame 10.

[0026] It should be noted that when the sealing action of the heat-sealing station assembly 33 is started, first, the movable frame 8 drives the fixed seat 335 to move upward. The movement of the movable frame 8 is driven by the driving module 7. This process is prior art and will not be described in detail here. The piston rod 337 fixedly connected to the fixed seat 335 slides upward along the inner wall of the inner cylinder seat 3310 synchronously (the limiting rod 338 cooperates with the limiting chute on the inner wall of the inner cylinder seat 3310 to limit the circumferential rotation of the piston rod 337 and ensure that it only makes an axial linear motion). When the piston rod 337 rises to a preset stroke, its top precisely contacts the lower end surface of the top rod 339 and continuously applies an upward pushing force, causing the top rod 339 to rise synchronously along the limiting structure of the inner cylinder seat 3310 against the initial resistance, thereby driving the convex block 3391 fixedly connected to the top of the top rod 339 to move upward coaxially. And after the stroke is completed, it can be reset by extrusion and the self-weight of the top rod 339.

[0027] The side wall of the protrusion 3391 has several circumferentially arranged limiting slots 3392, and the inner wall of the slots is fitted with an inclined pressing block 3393. The slide rod 3312, which is fixed at one end of the moving frame 3311, passes through the guide hole of the support frame 10 and is embedded in the limiting slot 3392, forming an inclined contact with the pressing block 3393. When the protrusion 3391 moves upward, the pressing block 3393 rises synchronously with the protrusion 3391. Its inclined surface slides relative to the end of the slide rod 3312 and generates a radial force. This force pushes the slide rod 3312 to slide radially away from the axis of the protrusion 3391 along the guide hole of the support frame 10, while stretching the telescopic spring sleeved on the outer wall of the slide rod 3312. At this time, the telescopic spring 3313 stores elastic potential energy to prepare for subsequent reset. Since the slide rod 3312 is rigidly connected to the moving frame 3311, the radial movement of the slide rod 3312 directly drives the moving frame 3311 to move as a whole towards the paper cup side. Finally, the sealing wheel 3316 fixed on the rotating rod 3317 on the side wall of the moving frame 3311 accurately fits the overlap between the cup body and the bottom of the cup, realizing multi-point positioning contact and applying a stable clamping force. The magnitude of the clamping force can be adjusted by the pushing stroke of the piston column 337 and the elastic coefficient of the telescopic spring 3313 to ensure that the pressure requirements of PE film melting and bonding are met, while avoiding crushing the paper base. It can also drive the gear disk 3314 to mesh with the corresponding teeth 3315.

[0028] While the sealing wheel 3316 presses against the overlapping joint, the rotating column 5 is connected to the gear transmission on the outer wall of the inner cylinder seat 3310 through a toothed chain. This allows the motor 6 to drive the inner cylinder seat 3310 to rotate via the rotating column 5 during operation. The bearing seat 333 and the inner cylinder seat 3310 are rotatably connected through a bearing, allowing the inner cylinder seat 3310 to rotate circumferentially while the piston column 337 is rotated while remaining axially fixed (the buffer spring 336 is in a compressed state at this time, and its elastic force offsets part of the vibration, ensuring rotational stability). The rotation of the inner cylinder seat 3310 is transmitted to the moving frame 3311 through the support frame 10. At the same time, the circumferential array teeth 3315 fixed on the inner wall of the upper cover 331 mesh with the gear disk 3314 at one end of the rotating rod 3317. When the moving frame 3311 rotates circumferentially with the inner cylinder seat 3310, the gear disk 3314 rolls along the teeth 3315 and drives the rotating rod 3317 to rotate, thereby causing the sealing wheel 3316 to rotate while revolving around the axis of the paper cup. This compound motion mode of revolution and rotation allows the sealing wheel 3316 to evenly cover the entire overlapping circumference of the cup body and the cup bottom through rolling friction. Revolution ensures that the sealing wheel 3316 squeezes all sealing areas, while rotation reduces the relative sliding friction between the sealing wheel 3316 and the PE coating, avoiding scratches or adhesion of the coating layer. At the same time, the heating function of the upper cover 331 (in conjunction with the overall temperature control system of the mold) transfers heat to the overlapping area, causing the PE coating of the cup body and the cup bottom to melt quickly and fully bond under the action of the clamping force.

[0029] Throughout the sealing process, the limiting rod 338 and the top rod 339 ensure axial movement accuracy through the limiting structure of the inner cylinder seat 3310, the meshing of the gear disk 3314 and the teeth 3315 ensures rotational synchronization, and the inclined surface cooperation between the squeezing block 3393 and the slide rod 3312 ensures the stability of radial clamping force. The three work together to ensure that the sealing wheel 3316 can accurately fit the sealing surface and achieve uniform heat pressing around the entire circumference, ultimately achieving a dense, non-false, and non-misaligned complete seal at the connection between the cup body and the cup bottom. After heat sealing is completed, the piston column 337 returns to its original position downwards, the radial thrust of the squeezing block 3393 on the slide rod 3312 disappears, the telescopic spring 3313 releases elastic potential energy to pull the slide rod 3312 radially back to its original position, and the moving frame 3311 and the sealing wheel 3316 disengage from the paper cup, completing one sealing cycle. Example

[0030] Reference Figure 14 and Figure 15 Furthermore, the side wall of the movable frame 3311 is provided with a mounting groove 3320. A pressure sensor 3319 is fixedly connected to the inner wall of the mounting groove 3320 away from the opening. The mounting groove 3320 is provided with a reset block 3322 and a reset spring 3321. The reset block 3322 is slidably connected to the inner wall of the mounting groove 3320. The reset spring 3321 is sleeved on the outside of the reset block 3322. The two ends of the reset spring 3321 are fixedly connected to the inner wall of the mounting groove 3320 and the side wall of the reset block 3322, respectively. The reset block 3322 is T-shaped. A ball bearing 3318 is rotatably connected to the end of the reset block 3322 away from the pressure sensor 3319.

[0031] It should be noted that: The initial force balance is established when the sealing wheel 3316 is unworn or the wear is within the allowable range. After the heat sealing station assembly 33 initiates the sealing action, the moving frame 3311 drives the sealing wheel 3316 to move towards the paper cup and maintain a stable pressing state. At this time, the wheel surface of the sealing wheel 3316 forms a tight line contact with the ball 3318 at the end of the reset block 3322. The ball 3318 can roll synchronously with the rotation of the sealing wheel 3316 through the rotational connection structure, which reduces frictional loss between the two and ensures stable transmission of contact pressure. In the initial state, the sealing wheel 3316 applies continuous pressure to the ball 3318. Radial pressure is transmitted to the "T"-shaped reset block 3322 through the ball bearing 3318, causing the reset block 3322 to apply pressure to the pressure sensor 3319 along the inner wall of the mounting groove 3320 and stretch the reset spring 3321 sleeved on the outside of the reset block 3322. When the clamping force of the sealing wheel 3316 and the elastic restoring force of the reset spring 3321 reach a balance, the reset block 3322 applies a stable preload pressure to the pressure sensor 3319. This pressure value is collected in real time by the pressure sensor 3319 and transmitted to the background monitoring system. The pressure value in this state is the "normal working pressure threshold".

[0032] As the number of production cycles increases, the force transmission of the sealing wheel 3316 changes due to wear. The sealing wheel 3316 experiences high-temperature rolling friction with the PE coating layer of the paper cup over a long period, causing its surface to gradually wear down (manifested as a reduction in wheel diameter). When the sealing wheel 3316 wears down, in the same heat-sealing stroke, the effective pressing stroke towards the paper cup is shortened due to the reduced wheel diameter, resulting in a simultaneous weakening of its radial pressing force on the ball bearing 3318. At this time, the return spring 3321, which was originally in a stretched state, loses some external pressure constraint, begins to release elastic potential energy, and generates a restoring force towards the sealing wheel 3316. Because the return block 3322 and the inner wall of the mounting groove 3320 use a high-precision sliding fit, the restoring force of the return spring 3321 will smoothly push the return block 3316. 22 moves along the mounting groove 3320 towards the sealing wheel 3316 to ensure the linearity of the movement trajectory. As the pressure signal changes and the threshold trigger reset block 3322 moves towards the sealing wheel 3316, the contact distance between the end away from the ball 3318 and the pressure sensor 3319 gradually increases, and the squeezing force between the two weakens synchronously. The real-time pressure value collected by the pressure sensor 3319 will be continuously lower than the initially set "normal working pressure threshold". The background monitoring system compares the collected pressure value with the preset threshold range in real time. When the pressure value is detected to be lower than the lower limit of the threshold for three to five working cycles, and interference factors such as temperature fluctuation of the sealing wheel 3316 and thickness deviation of the paper cup material are eliminated, the system determines that the sealing wheel 3316 has reached the critical wear state.

[0033] The early warning mechanism and its protective effect: When the monitoring system confirms that the sealing wheel 3316 is worn beyond the standard, it will immediately activate a multi-layer early warning mechanism. On the one hand, it will provide on-site reminders through flashing indicator lights and buzzer alarms on the equipment operation panel; on the other hand, it will notify relevant management personnel through SMS and system messages sent by the back-end management system. The core function of this early warning mechanism is to avoid sealing defects caused by excessive wear of the sealing wheel 3316. If the sealing wheel 3316 is not replaced in time after wear, its wheel surface cannot form an effective compression with the paper cup, which will lead to insufficient heat sealing pressure and insufficient PE film melting and bonding, resulting in problems such as poor sealing and leakage. At the same time, the increased roughness of the worn wheel surface may scratch the film layer or cause PE material to stick to the wheel surface, affecting the product appearance and sealing consistency. By providing real-time early warning and timely replacement of the sealing wheel 3316, it can be ensured that the sealing wheel 3316 can provide stable compression force and uniform heat conduction in every heat sealing operation, ensuring that the sealing quality at the connection between the cup body and the cup bottom is always within the qualified range.

[0034] In addition, the design of this structure also has adaptive adjustment characteristics. When a new sealing wheel 3316 is replaced, the diameter of the new wheel returns to the standard size, and its clamping force on the ball 3318 increases again. This pushes the reset block 3322 to stretch the reset spring 3321 and move it towards the pressure sensor 3319 until the force balance is reached again. The detection value of the pressure sensor 3319 returns to the normal threshold range, and the warning state is automatically released without manual recalibration, which significantly improves the operation and maintenance efficiency of the equipment.

[0035] It should be noted that the specific model and specifications of the motor need to be selected and determined based on the actual specifications of the device. The specific selection and calculation method adopts the existing technology in this field, so it will not be described in detail here.

[0036] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A composite mold structure for heat-sealing the bottom of a paper cup, comprising a processing table (1), wherein the processing table (1) is provided with a lifting plate (2), an upper mold module (4) and a drive module (7) inside, the lifting plate (2) is connected to a rotating column (5) and a motor (6), and a movable frame (8) is provided on one side of the lifting plate (2), characterized in that, Also includes: The lower mold module (3) is located inside the processing table (1). The lower mold module (3) includes a preheating station (31), a bottom rolling station (32), a heat sealing station assembly (33), and an edge rolling station (34). The heat sealing station assembly (33) is connected to a sleeve (9) and a support frame (10). The heat sealing station assembly (33) is used for sealing the bottom of the paper cup.

2. The composite mold structure for heat-sealing the bottom of a paper cup according to claim 1, characterized in that, The lifting plate (2) is fixedly connected to the lower mold module (3). The lower mold module (3) is located between the upper mold module (4) and the lifting plate (2). The lifting plate (2) is connected to the rotating column (5) and the motor (6) respectively. The lower end of the lifting plate (2) is rotatably connected to one end of the movable frame (8).

3. The composite mold structure for heat-sealing the bottom of a paper cup according to claim 2, characterized in that, The heat sealing station assembly (33) includes an upper cover (331), a receiving ring (332), and a support seat (333). The receiving ring (332) is located between the upper cover (331) and the support seat (333). The receiving ring (332) is detachably connected to the upper cover (331) and the support seat (333) respectively. The inner wall of the upper cover (331) is fixedly connected with a number of teeth (3315) arranged in a circular array. The outer wall of the support seat (333) is fitted with a fixing ring (334). The fixing ring (334) is detachably connected to the lifting plate (2).

4. The composite mold structure for heat-sealing the bottom of a paper cup according to claim 3, characterized in that, The bearing seat (333) is provided with an inner cylinder seat (3310) inside. The bearing seat (333) and the inner cylinder seat (3310) are rotatably connected by a bearing. The outer wall of the inner cylinder seat (3310) is fixedly connected to the sleeve (9). The piston column (337) is slidably connected inside the inner cylinder seat (3310).

5. The composite mold structure for heat-sealing the bottom of a paper cup according to claim 4, characterized in that, The piston rod (337) is connected to a limiting rod (338), which slides against the inner wall of the inner cylinder seat (3310). A fixed seat (335) is fixedly connected to one end of the piston rod (337) outside the inner cylinder seat (3310). The fixed seat (335) is fixedly connected to the movable frame (8). A buffer spring (336) is sleeved on the outer wall of the inner cylinder seat (3310). The two ends of the buffer spring (336) abut against the fixed seat (335) and the side wall of the inner cylinder seat (3310), respectively.

6. The composite mold structure for heat-sealing the bottom of a paper cup according to claim 5, characterized in that, The heat sealing station assembly (33) also includes a push rod (339), which slides between the push rod (339) and the inner cylinder seat (3310). One end of the push rod (339) is in contact with the piston column (337), and the other end of the push rod (339) is fixedly connected to a protrusion (3391). The side wall of the protrusion (3391) is provided with a plurality of circumferentially distributed limiting slots (3392), and the inner wall of the limiting slots (3392) is equipped with an extrusion block (3393).

7. The composite mold structure for heat-sealing the bottom of a paper cup according to claim 6, characterized in that, The support frame (10) is sleeved on the outside of the top rod (339), and one end of the support frame (10) is fixedly connected to the inner cylinder seat (3310).

8. The composite mold structure for heat-sealing the bottom of a paper cup according to claim 7, characterized in that, The heat-sealing station component (33) further includes a moving frame (3311). The moving frame (3311) is arranged in a "U" shape. A rotating rod (3317) is rotatably connected to the side wall of the moving frame (3311). One end of the rotating rod (3317) is fixedly connected to a gear disk (3314) that meshes with the teeth (3315). A sealing wheel (3316) is fixedly connected to the outer wall of the rotating rod (3317).

9. The composite mold structure for heat-sealing the bottom of a paper cup according to claim 8, characterized in that, One end of the moving frame (3311) is fixedly connected to a sliding rod (3312). One end of the sliding rod (3312) is respectively slidably connected to a limiting slot hole (3392), a pressing block (3393), and a support frame (10). A telescopic spring (3313) is sleeved on the outer wall of the sliding rod (3312). The two ends of the telescopic spring (3313) are respectively fixedly connected to the side wing of the moving frame (3311) and the outer wall of the support frame (10).

10. The composite mold structure for heat-sealing the bottom of a paper cup according to claim 9, characterized in that, An installation groove (3320) is formed in the side wall of the moving frame (3311). A pressure sensor (3319) is fixedly connected to the inner wall of the installation groove (3320) far away from the opening. A reset block (3322) and a reset spring (3321) are arranged inside the installation groove (3320). The reset block (3322) is slidably connected to the inner wall of the installation groove (3320). The reset spring (3321) is sleeved on the outside of the reset block (3322). The two ends of the reset spring (3321) are respectively fixedly connected to the inner wall of the installation groove (3320) and the side wall of the reset block (3322). The reset block (3322) is arranged in a "T" shape. A ball (3318) is rotatably connected to one end of the reset block (3322) far away from the pressure sensor (3319).

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