Uniform baking molding equipment and baking method for acrylic bathtub

Abstract

This invention discloses a uniform baking and forming device and method for acrylic bathtubs. The baking and forming device includes a placement platform, a positioning mechanism, a baking mechanism, an outer frame, a flexible curtain, and a locking structure. The baking mechanism includes a heating chamber disposed above the placement platform. The heating chamber contains a matrix of independently controlled heating tubes. The outer frame is located around the periphery of the heating chamber. Mounting plates are located at both ends of the heating chamber along the moving direction. Each mounting plate is connected to the outer frame by an elastic connector. The flexible curtain is mounted on the outer frame, with its upper end fixedly connected to the lower end of the outer frame. The locking structure is located on the placement platform. This invention achieves uniform baking across the entire area by moving the heating chamber in conjunction with the matrix of independently controlled heating tubes. After the outer frame is locked, the flexible curtain maintains a stable downward posture, effectively preventing heat loss and ensuring uniform softening of the acrylic sheet.

Description

Technical Field

[0001] This invention relates to the field of acrylic sheet baking equipment technology, specifically to an acrylic bathtub uniform baking and molding equipment and baking method. Background Technology

[0002] Before thermoforming, acrylic bathtubs require uniform preheating of the sheet material to ensure consistent softening and defect-free molding in the mold. Existing acrylic bathtub baking equipment often lacks an effective seal between the heating chamber and the edge of the acrylic sheet during the heating process, causing significant heat loss from the sides and ends of the sheet, resulting in a significantly lower temperature at the edges compared to the center.

[0003] Current equipment often relies on the downward pressing and closing of baffles to achieve sealing, and most adopt a lifting baffle structure. However, when the acrylic sheet is in a softened state at high temperatures, the mechanical pressing of the baffle can easily cause local deformation, indentation, or stress concentration in the sheet, affecting the appearance and dimensional accuracy of the finished product. This restricts the high-quality and high-efficiency production requirements of acrylic bathtubs.

[0004] Therefore, there is a need for a uniform baking and molding equipment for acrylic bathtubs to solve the problems of heat loss and uneven heating of the sheet material caused by poor sealing of the heating chamber edge in the existing technology, so as to ensure the quality and production efficiency of subsequent thermoforming. Summary of the Invention

[0005] To address the problems existing in the prior art, a uniform baking and molding device for acrylic bathtubs is provided. The device achieves uniform baking across the entire area by using a moving heating chamber in conjunction with a matrix of independently temperature-controlled heating tubes. After the outer frame is locked, the flexible curtain maintains a stable hanging posture, effectively preventing heat loss, ensuring uniform softening of the acrylic sheet, and reducing molding defects.

[0006] To address the problems of existing technologies, this invention provides a uniform baking and molding device for acrylic bathtubs, comprising a placement platform with a positioning mechanism for fixing an acrylic sheet, and a baking mechanism. The baking mechanism includes a heating chamber located above the placement platform, capable of moving along the placement platform to cover the acrylic sheet. The heating chamber contains matrix-arranged and independently controlled heating tubes. An outer frame is located around the periphery of the heating chamber. Mounting plates are located at both ends of the heating chamber along the moving direction, with a gap between the mounting plates and the outer frame. Each mounting plate is connected to the outer frame with an elastic connector. A flexible curtain, in a ring structure, is mounted on the outer frame, with its upper end fixedly connected to the lower end of the outer frame. The lower end of the flexible curtain hangs down to the surface of the placement platform, forming a sealing ring around the edge of the acrylic sheet. A locking structure is located on the placement platform to lock the outer frame when the heating chamber adjusts its baking position.

[0007] Preferably, the locking structure includes a fixed baffle and a movable baffle, which are symmetrically arranged on both sides of the placement platform along the moving direction of the heating chamber, and a locking space is formed between the fixed baffle and the movable baffle.

[0008] Preferably, the placement platform is provided with a vertical guide rail at the position of the movable baffle, the movable baffle is slidably disposed in the vertical guide rail, the lower end of the vertical guide rail is provided with a lifting cylinder, and the output shaft of the lifting cylinder is fixedly connected to the bottom of the movable baffle.

[0009] Preferably, the front end of the outer frame is provided with a front stop block that cooperates with the fixed baffle, and the rear end of the outer frame is provided with a rear stop block that cooperates with the movable baffle. Both the front stop block and the rear stop block are wedge-shaped blocks, and the fixed baffle and the movable baffle are respectively provided with matching wedge-shaped surfaces.

[0010] Preferably, the outer frame is provided with a sealing edge that slides in contact with the heating chamber and the mounting plate.

[0011] Preferably, the elastic connector includes a guide rod and a spring. One end of the guide rod is fixedly connected to the mounting plate, and the other end extends outward perpendicularly through the outer frame. The spring is sleeved on the guide rod, with one end fixedly connected to the guide rod and the other end fixedly connected to the inner wall of the outer frame.

[0012] Preferably, the mounting plate is provided with a plurality of airflow nozzles, which are distributed circumferentially along the inner side of the flexible curtain and are used to blow downward airflow into the inner side of the flexible curtain.

[0013] Preferably, the mounting plate has an airflow guide groove extending vertically along the inner side of the flexible curtain, and the air outlet of the airflow nozzle is connected to the airflow guide groove to guide the airflow to adhere to the inner surface of the flexible curtain and flow downward.

[0014] Preferably, the mounting plate is provided with a distance sensor arranged along the moving direction of the heating chamber, and the outer frame is provided with a sensing point at a corresponding position that cooperates with the distance sensor, for real-time monitoring of the position of the heating chamber relative to the outer frame.

[0015] The present invention also provides a method for uniformly baking acrylic bathtubs, comprising the following steps: S1. Place the acrylic sheet on the placement platform and press and fix the edges of the acrylic sheet by the positioning mechanism; S2. Activate the locking structure to lock the outer frame in a stationary position on the placement platform, causing the lower end of the flexible curtain to hang down and adhere to the surface of the placement platform, forming a sealing ring around the edge of the acrylic sheet; S3. Start the baking mechanism. The heating chamber moves back and forth in the horizontal direction and sweeps the acrylic plate through the heating tubes arranged in a matrix and with independent temperature control inside the heating chamber.

[0016] The advantages of this application compared to the prior art are: 1. This invention adjusts the baking position by moving the heating chamber, and, in conjunction with a matrix of independently temperature-controlled heating tubes, achieves uniform heating of the entire acrylic sheet.

[0017] Simultaneously, a locking structure is used to fix the outer frame, allowing the annular flexible curtain to hang stably and form an edge sealing ring, effectively preventing heat loss. The combination of pressurized bubbling and negative pressure molding processes ensures a consistent softening state of the acrylic sheet, reducing defects such as uneven wall thickness, tensile cracking, or springback. This improves the molding precision and surface quality of the acrylic bathtub and solves the problem of uneven baking caused by edge heat loss in existing technologies.

[0018] 2. This invention uses a fixed baffle and a liftable movable baffle to form a locking space after the outer frame is in place, thereby achieving stable clamping of the outer frame.

[0019] After the baking preparation stage is completed, the locking mechanism reliably fixes the outer frame in a stationary state, so that the outer frame does not shift or shake during the baking position adjustment in the heating chamber. This ensures that the flexible curtain always hangs precisely and fits the placement platform, maintains the continuity and reliability of the edge seal, and effectively prevents heat from escaping from the periphery of the acrylic plate.

[0020] 3. This invention guides compressed air to form a stable downward-blowing air film adhering to the curtain surface by setting circumferentially distributed airflow nozzles and airflow guide grooves extending vertically along the inner side of the flexible curtain on the mounting plate. This airflow utilizes the wall adhesion effect and downward traction force to effectively overcome the effects of thermal buoyancy, static electricity, or mechanical interference, ensuring that the flexible curtain always maintains a smooth and tight downward hanging posture.

[0021] Even if the heating chamber moves through the positioning mechanism area, the flexible curtain will not lift or snag, thus ensuring that the flexible curtain remains in contact with the surface of the placement platform to form a complete sealing ring, preventing heat from escaping from the edge gaps and ensuring the uniformity of the temperature field and the reliability of the seal during the acrylic sheet baking process. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the heating chamber of an acrylic bathtub uniform baking and molding device of the present invention, when the heating chamber is not covered with an acrylic plate, from a first perspective.

[0023] Figure 2 This is a three-dimensional structural diagram of the heating chamber of an acrylic bathtub uniform baking and molding device of the present invention, when the heating chamber is not covered with an acrylic plate, from a second perspective.

[0024] Figure 3 This is a three-dimensional structural diagram of the heating chamber of an acrylic bathtub uniform baking and molding device of the present invention, when the chamber is covered with an acrylic plate, from a first perspective.

[0025] Figure 4 This is a three-dimensional structural diagram of the heating chamber of an acrylic bathtub uniform baking and molding device of the present invention, when the chamber is covered with an acrylic plate, from a second perspective.

[0026] Figure 5 This is a partial three-dimensional structural cross-sectional view of an acrylic bathtub uniform baking and molding device according to the present invention.

[0027] Figure 6 yes Figure 5 Enlarged diagram of point A in the middle.

[0028] Figure 7 This is a three-dimensional structural cross-sectional view of the fixed baffle and outer frame of an acrylic bathtub uniform baking molding device according to the present invention.

[0029] Figure 8 This is a planar sectional view of the fixed baffle and outer frame of an acrylic bathtub uniform baking and molding device according to the present invention.

[0030] Figure 9 This is a three-dimensional structural cross-sectional view of the movable baffle and outer frame of an acrylic bathtub uniform baking molding device according to the present invention.

[0031] Figure 10 This is a planar sectional view of the movable baffle and outer frame of an acrylic bathtub uniform baking and molding device according to the present invention.

[0032] Figure 11 This is a three-dimensional structural diagram of the placement platform and positioning mechanism of an acrylic bathtub uniform baking and molding equipment according to the present invention.

[0033] The diagram is labeled as follows: 1. Placement platform; 11. Sealing chamber; 12. Molding mold; 13. Vertical guide rail; 14. Lifting cylinder; 2. Acrylic plate; 3. Positioning mechanism; 31. Limiting plate; 32. Pressing foot cylinder; 321. Pressing plate; 4. Baking mechanism; 41. Heating chamber; 411. Heating tube; 42. Outer frame; 421. Mounting plate; 4211. Airflow nozzle; 4212. Airflow guide channel; 4213. Distance sensor; 4214. Sensing point; 422. Elastic connector; 4221. Guide rod; 4222. Spring; 4223. Anti-detachment ring; 423. Front stop block; 424. Rear stop block; 43. Flexible curtain; 44. Locking structure; 441. Fixed baffle; 442. Movable baffle; 5. Slide rail; 51. Slider. Detailed Implementation

[0034] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0035] See Figures 1 to 6 As shown, an acrylic bathtub uniform baking and molding device includes a placement platform 1, on which a positioning mechanism 3 for fixing an acrylic sheet 2 is provided. It also includes a baking mechanism 4, which includes a heating chamber 41 disposed above the placement platform 1 and movable along the direction of the placement platform 1 to cover the acrylic sheet 2. The heating chamber 41 contains a matrix of independently controlled heating tubes 411. An outer frame 42 is disposed around the outer periphery of the heating chamber 41. Mounting plates 421 are provided at both ends of the heating chamber 41 along the moving direction, with a gap between the mounting plates 421 and the outer frame 42. Each mounting plate 421 is connected to the outer frame 42 by an elastic connector 422. A flexible curtain 43, in a ring structure, is installed on the outer frame 42. The upper end of the flexible curtain 43 is fixedly connected to the lower end of the outer frame 42, and the lower end of the flexible curtain 43 hangs down to the surface of the placement platform 1, forming a sealing ring around the edge of the acrylic sheet 2. A locking structure 44 is provided on the placement platform 1 for locking the outer frame 42 when the heating chamber 41 is adjusted to the baking position.

[0036] The placement platform 1 has an opening in the middle, and a sealing chamber 11 is provided below the opening. The sealing chamber 11 is provided with a molding mold 12, and the sealing chamber 11 is also equipped with a pressurization system and a negative pressure system.

[0037] The positioning mechanism 3 includes a limiting plate 31 arranged around the edge of the acrylic plate 2 and multiple presser cylinders 32. The output end of the presser cylinder 32 is connected to a pressure plate 321, which is used to press and fix the acrylic plate 2 during the baking process.

[0038] The placement platform 1 is provided with slide rails 5 on both sides along the moving direction of the heating chamber 41, and the heating chamber 41 is slidably connected to the slide rails 5 via a slider 51.

[0039] Working process: First, the acrylic sheet 2 to be processed is placed stably on the placement platform 1. At this time, the limiting plate 31 arranged around the edge of the acrylic sheet 2 first constrains its position. Then, multiple presser foot cylinders 32 act synchronously, driving the pressure plate 321 connected to its output end to move downward, firmly pressing the four edges of the acrylic sheet 2 onto the placement platform 1, ensuring that it will not shift or warp during subsequent heating and molding processes.

[0040] After positioning is completed, the baking mechanism 4 begins operation. Guided by the slide rails 5 on both sides, the heating chamber 41 moves horizontally along the length of the placement platform 1 via the slider 51, gradually covering the entire area of ​​the acrylic plate 2. The heating chamber 41 is equipped with a matrix arrangement of heating tubes 411, each of which can independently adjust its power. Combined with the reciprocating sweeping motion of the heating chamber 41, uniform heat radiation is achieved over the entire surface of the acrylic plate 2, avoiding the local underheating problem caused by traditional fixed heating.

[0041] When the heating chamber 41 moves above the acrylic plate 2, the locking structure 44 is activated, locking the outer frame 42 located around the heating chamber 41 in a fixed position on the placement platform 1. The outer frame 42 is connected to the mounting plates 421 at both ends of the heating chamber 41 via elastic connectors 422, with a clearance between them along the direction of movement, allowing the outer frame 42 to remain stationary during the reciprocating movement of the heating chamber 41. At the same time, the annular flexible curtain 43 installed at the lower end of the outer frame 42 hangs down naturally due to its own weight, with its lower end adhering to the surface of the placement platform 1, forming a continuous, closed sealing ring around the edge of the acrylic plate 2, effectively preventing hot air from escaping from the periphery.

[0042] Subsequently, throughout the entire heating process, the outer frame 42 remains fixed in place by the locking structure 44, and the flexible curtain 43 maintains a stable vertical sealing state. Even if the heating chamber 41 moves repeatedly, the sealing interface will not be disturbed.

[0043] Once the acrylic sheet 2 is uniformly heated to its softening temperature, the heating chamber 41 stops moving and returns to its initial position. Subsequently, the pressurization system within the sealed chamber 11 activates, introducing compressed air into the sealed cavity beneath the acrylic sheet 2. This creates positive pressure on the lower surface of the sheet, causing the softened acrylic sheet 2 to bulge upwards, forming uniform air bubbles. In this state, the molding mold 12, located below the opening in the center of the placement platform 1, begins to rise until it reaches the preset molding height, approaching the bulging acrylic sheet 2.

[0044] Immediately afterwards, the pressurization system shuts down, and the negative pressure system quickly activates, creating a negative pressure environment within the sealed chamber 11. This allows the bulging acrylic sheet 2 to rapidly and evenly adhere to the curved contour of the molding mold 12 under the influence of the internal and external pressure difference, completing precise thermoforming. The entire process benefits from the uniform heating and efficient edge sealing achieved during the initial baking stage. The softening state of each area of ​​the acrylic sheet 2 is highly consistent, effectively avoiding defects such as uneven wall thickness, tensile cracking, collapse, or springback caused by localized overheating or underheating. This improves the dimensional accuracy of the finished product and solves the problem of uneven baking caused by edge heat loss in existing technologies.

[0045] See Figures 3 to 5 and Figures 7 to 11As shown, the locking structure 44 includes a fixed baffle 441 and a movable baffle 442. The fixed baffle 441 and the movable baffle 442 are symmetrically arranged on both sides of the placement platform 1 along the moving direction of the heating chamber 41, and a locking space is formed between the fixed baffle 441 and the movable baffle 442.

[0046] When the heating chamber 41 moves the outer frame 42 along the placement platform 1 to the preset baking position, the outer frame 42 enters the area defined by the fixed baffle 441 and the movable baffle 442. The fixed baffle 441 is fixedly installed on one side of the placement platform 1, while the movable baffle 442 is initially in a low position, leaving a passage for the outer frame 42 to pass through.

[0047] After the front end of the outer frame 42 abuts against the fixed baffle 441, the movable baffle 442 rises vertically, approaches and contacts the rear end of the outer frame 42 from the other side, and finally clamps the outer frame 42 together with the fixed baffle 441, forming a stable locking space between them. This locking space firmly confines the outer frame 42 to a stationary state, preventing it from shifting or shaking during the subsequent reciprocating movement of the heating chamber 41 and high-temperature baking, thereby ensuring that the flexible curtain 43 surrounding the edge of the acrylic plate 2 always hangs down and fits snugly, maintaining the integrity of the seal.

[0048] See Figure 4 , Figure 9 and Figure 10 As shown, the placement platform 1 is provided with a vertical guide rail 13 at the position of the movable baffle 442. The movable baffle 442 is slidably disposed in the vertical guide rail 13. A lifting cylinder 14 is provided at the lower end of the vertical guide rail 13. The output shaft of the lifting cylinder 14 is fixedly connected to the bottom of the movable baffle 442.

[0049] When the outer frame 42 moves with the heating chamber 41 to the target baking position and its front end abuts against the fixed baffle 441, the control system triggers the lifting cylinder 14 to move. The output axis of the lifting cylinder 14 extends upward, pushing the movable baffle 442, which is fixedly connected to its bottom, to rise smoothly along the vertical guide rail 13. The vertical guide rail 13 precisely guides the movement trajectory of the movable baffle 442, ensuring that it does not deviate or get stuck during its vertical upward movement.

[0050] The movable baffle 442 eventually rises to contact the rear end of the outer frame 42 and applies clamping force, forming a stable locking space in conjunction with the fixed baffle 441, thereby reliably locking the outer frame 42 in a stationary position and providing a stable sealing foundation for the flexible curtain 43.

[0051] See Figures 7 to 10As shown, the front end of the outer frame 42 is provided with a front stop block 423 that cooperates with the fixed baffle 441, and the rear end of the outer frame 42 is provided with a rear stop block 424 that cooperates with the movable baffle 442. Both the front stop block 423 and the rear stop block 424 are wedge-shaped blocks, and the fixed baffle 441 and the movable baffle 442 are respectively provided with matching wedge-shaped surfaces.

[0052] When the outer frame 42 moves to the baking station with the heating chamber 41, the wedge-shaped front stop 423 at its front end first contacts the corresponding wedge-shaped surface on the fixed baffle 441. Subsequently, the movable baffle 442 rises along the vertical guide rail 13 under the drive of the lifting cylinder 14, and the wedge-shaped surface at its top gradually approaches and presses against the wedge-shaped rear stop 424 at the rear end of the outer frame 42.

[0053] During clamping, the two sets of wedge-shaped mating surfaces interlock, utilizing the self-centering characteristic of the wedge structure to automatically center and position the outer frame 42 in the horizontal direction. Simultaneously, the clamping force is converted into a pressing force perpendicular to the contact surface, enhancing locking stability. This ensures that the flexible curtain 43 remains in a precise vertical sealing position, thereby maintaining the continuity and reliability of the edge seal.

[0054] See Figure 5 and Figure 6 As shown, the outer frame 42 is provided with a sealing edge that slides in contact with the heating chamber 41 and the mounting plate 421.

[0055] During the reciprocating horizontal movement of the heating chamber 41 to adjust its baking position, the outer frame 42 remains relatively stationary via the elastic connector 422, while the heating chamber 41 and its mounting plates 421 at both ends slide relative to the outer frame 42. At this time, the sealing edge continuously forms sliding contact with the moving parts. During the movement, the sealing edge remains pressed against the corresponding surfaces of the heating chamber 41 and the mounting plates 421, dynamically sealing the annular gap between them and the outer frame 42, effectively preventing hot air inside the heating chamber 41 from leaking to the external environment through the gap.

[0056] While allowing the heating chamber 41 to move freely, the sealing integrity of the edge of the hot cavity is maintained to prevent heat loss from the edge due to the expansion of the gap, thereby ensuring the uniform heating of the acrylic plate 2.

[0057] See Figure 5 and Figure 6 As shown, the elastic connector 422 includes a guide rod 4221 and a spring 4222. One end of the guide rod 4221 is fixedly connected to the mounting plate 421, and the other end extends outward perpendicularly through the outer frame 42. The spring 4222 is sleeved on the guide rod 4221. One end of the spring 4222 is fixedly connected to the guide rod 4221, and the other end is fixedly connected to the inner wall of the outer frame 42.

[0058] The end of the guide rod 4221 that extends outward through the outer frame 42 is provided with an anti-detachment ring 4223, which is used to prevent the guide rod 4221 from completely detaching from the guide hole of the outer frame 42 during movement.

[0059] During the movement of the heating chamber 41, the mounting plates 421 at both ends move synchronously, while the outer frame 42 must remain stationary to maintain the stable closure of the flexible curtain 43. At this time, the elastic connector 422 connecting the mounting plates 421 and the outer frame 42 comes into play. When the mounting plates 421 drive the guide rods 4221 to slide relative to the outer frame 42, the springs 4222 are compressed or stretched, providing buffering and restoring forces, allowing the heating chamber 41 to move freely back and forth while maintaining the flexible connection between the heating chamber 41 and the outer frame 42.

[0060] After the outer frame 42 is unlocked by the locking structure 44, the spring 4222 can automatically reset the outer frame 42 to the centered position relative to the heating chamber 41, which is beneficial for the next round of work.

[0061] See Figure 5 and Figure 6 As shown, the mounting plate 421 is provided with a plurality of airflow nozzles 4211, which are distributed circumferentially along the inner side of the flexible curtain 43 and are used to blow downward airflow into the inner side of the flexible curtain 43.

[0062] During the moving baking process of the heating chamber 41, multiple airflow nozzles 4211 distributed circumferentially along the inner side of the flexible curtain 43 on the mounting plate 421 continuously supply clean compressed air, directionally blowing vertically downward airflow onto the inner surface of the flexible curtain 43. This downward airflow forms a stable air curtain inside the flexible curtain 43. Utilizing the wall-attaching effect and downward traction of the airflow, the flexible curtain 43 remains in a natural drooping state and tightly adheres to the surface of the placement platform 1. Even when the heating chamber 41 passes the positioning mechanism 3, the flexible curtain 43 will not tilt due to snagging, thus ensuring the continuous integrity of the sealing ring around the edge of the acrylic plate 2, preventing heat loss from gaps, and ensuring the uniformity of the baking temperature field.

[0063] See Figure 6 As shown, the mounting plate 421 has an airflow guide groove 4212 extending vertically along the inner side of the flexible curtain 43. The air outlet of the airflow nozzle 4211 is connected to the airflow guide groove 4212 to guide the airflow to adhere to the inner surface of the flexible curtain 43 and flow downward.

[0064] During operation, compressed air flows from the outlet of the airflow nozzle 4211 into the airflow guide groove 4212. This airflow guide groove 4212 is positioned close to the inner surface of the flexible curtain 43, constraining and guiding the airflow. This forces the airflow to adhere to the inner wall of the flexible curtain 43 and flow downwards, forming a stable and concentrated downward-blowing air film. This enhances the adhesion and traction effect of the airflow on the flexible curtain 43, ensuring that the flexible curtain 43 maintains a smooth and tight downward drooping posture, preserving the integrity of the edge seal and the uniformity of the baking heat field.

[0065] See Figures 7 to 10 As shown, the mounting plate 421 is provided with a distance sensor 4213 arranged along the moving direction of the heating chamber 41, and the outer frame 42 is provided with a sensing point 4214 at the corresponding position to cooperate with the distance sensor 4213, for real-time monitoring of the position of the heating chamber 41 relative to the outer frame 42.

[0066] During the reciprocating movement of the heating chamber 41 in the horizontal direction, the distance sensor 4213, which is set on the mounting plate 421 and arranged along the movement direction, continuously emits detection signals to sense the distance change of the corresponding sensing point 4214 on the outer frame 42 in real time.

[0067] Once the outer frame 42 is fixed by the locking structure 44, the distance sensor 4213 accurately determines the current position of the heating chamber 41 relative to the stationary outer frame 42 by monitoring the relative displacement between itself and the sensing point 4214. The control system dynamically adjusts the movement stroke and stopping point of the heating chamber 41 based on this feedback signal, ensuring that it accurately covers the entire area of ​​the acrylic plate 2 in each baking cycle and avoiding uneven heating due to overtravel or undertravel.

[0068] A method for uniformly baking acrylic bathtubs, applied to the aforementioned acrylic bathtub uniform baking and molding equipment, includes the following steps: S1. Place the acrylic sheet 2 on the placement platform 1 and press and fix the edge of the acrylic sheet 2 by the positioning mechanism 3; S2. Activate the locking structure 44 to lock the outer frame 42 in a stationary position on the placement platform 1, so that the lower end of the flexible curtain 43 hangs down and fits against the surface of the placement platform 1, forming a sealing ring around the edge of the acrylic plate 2. S3. Start the baking mechanism 4. The heating chamber 41 moves back and forth in the horizontal direction and performs sweeping full-area heating on the acrylic plate 2 through the heating tubes 411 arranged in a matrix and independently controlled inside the heating chamber 41.

[0069] This invention achieves uniform sweeping heating of the entire acrylic sheet 2 by horizontally moving the heating chamber 41 in conjunction with the matrix-type independent temperature-controlled heating tubes 411. At the same time, the locking structure 44 reliably fixes the outer frame 42 in a stationary position, allowing the annular flexible curtain 43 to hang stably and form a sealing ring around the edge of the sheet, effectively preventing heat loss.

[0070] Furthermore, the circumferential airflow nozzles 4211 and vertical airflow guide channels 4212 on the mounting plate 421 form a stable downward-blowing film adhering to the inner wall of the flexible curtain 43. Utilizing the wall-attaching effect and downward traction, this prevents the flexible curtain 43 from tilting or snagging on the positioning mechanism 3 during the movement of the heating chamber 41, ensuring it remains tightly fitted to the placement platform 1. This guarantees a highly uniform baking temperature field and improves the dimensional accuracy and surface quality of the acrylic bathtub.

[0071] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A uniform baking molding apparatus for an acrylic bathtub, comprising a placing platform, wherein a positioning mechanism for fixing an acrylic plate is provided on the placing platform, characterized in that, It also includes a baking mechanism, which comprises: A heating chamber is located above the placement platform and can move along the direction of the placement platform to cover the acrylic plate. The heating chamber is equipped with heating tubes arranged in a matrix and controlled independently. An outer frame is provided on the outer periphery of the heating chamber. The heating chamber is provided with mounting plates at both ends along the moving direction. An movable gap is left between the mounting plates and the outer frame. Each mounting plate is provided with an elastic connector to the outer frame. A flexible curtain, in the form of a ring, is installed on the outer frame. The upper end of the flexible curtain is fixedly connected to the lower end of the outer frame, and the lower end of the flexible curtain hangs down to the surface of the placement platform, forming a sealing ring around the edge of the acrylic plate. A locking structure is provided on the placement platform for locking the outer frame when the heating chamber is adjusted to bake.

2. The uniform baking molding apparatus for an acrylic bathtub according to claim 1, wherein The locking structure includes a fixed baffle and a movable baffle, which are symmetrically arranged on both sides of the placement platform along the moving direction of the heating chamber, and a locking space is formed between the fixed baffle and the movable baffle.

3. The uniform baking molding apparatus for an acrylic bathtub according to claim 2, wherein The placement platform is provided with a vertical guide rail at the position of the movable baffle. The movable baffle is slidably disposed in the vertical guide rail. A lifting cylinder is provided at the lower end of the vertical guide rail. The output shaft of the lifting cylinder is fixedly connected to the bottom of the movable baffle.

4. The acrylic bathtub uniform baking and molding equipment according to claim 3, characterized in that, The front end of the outer frame is provided with a front stop block that cooperates with the fixed baffle, and the rear end of the outer frame is provided with a rear stop block that cooperates with the movable baffle. Both the front stop block and the rear stop block are wedge-shaped blocks, and the fixed baffle and the movable baffle are respectively provided with matching wedge-shaped surfaces.

5. The acrylic bathtub uniform baking and molding equipment according to claim 1, characterized in that, The outer frame is provided with a sealing edge that slides in contact with the heating chamber and the mounting plate.

6. The acrylic bathtub uniform baking and molding equipment according to claim 1, characterized in that, The elastic connector includes a guide rod and a spring. One end of the guide rod is fixedly connected to the mounting plate, and the other end extends outward perpendicularly through the outer frame. The spring is sleeved on the guide rod, with one end fixedly connected to the guide rod and the other end fixedly connected to the inner wall of the outer frame.

7. The acrylic bathtub uniform baking and molding equipment according to claim 1, characterized in that, The mounting plate is provided with a number of airflow nozzles, which are distributed circumferentially along the inner side of the flexible curtain and are used to blow downward airflow into the inner side of the flexible curtain.

8. The acrylic bathtub uniform baking and molding equipment according to claim 7, characterized in that, The mounting plate has an airflow guide groove extending vertically along the inner side of the flexible curtain. The air outlet of the airflow nozzle is connected to the airflow guide groove to guide the airflow to adhere to the inner surface of the flexible curtain and flow downward.

9. The acrylic bathtub uniform baking and molding equipment according to claim 1, characterized in that, The mounting plate is equipped with a distance sensor arranged along the moving direction of the heating chamber, and the outer frame is equipped with sensing points at corresponding positions that cooperate with the distance sensor to monitor the position of the heating chamber relative to the outer frame in real time.

10. A method for uniformly baking acrylic bathtubs, applied to the uniform baking and molding equipment for acrylic bathtubs as described in any one of claims 1-9, characterized in that, Includes the following steps: S1. Place the acrylic sheet on the placement platform and press and fix the edges of the acrylic sheet by the positioning mechanism; S2. Activate the locking structure to lock the outer frame in a stationary position on the placement platform, causing the lower end of the flexible curtain to hang down and adhere to the surface of the placement platform, forming a sealing ring around the edge of the acrylic sheet; S3. Start the baking mechanism. The heating chamber moves back and forth in the horizontal direction and sweeps the acrylic plate through the heating tubes arranged in a matrix and with independent temperature control inside the heating chamber.

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