A high-efficiency production acrylic bathtub forming device

Abstract

This invention relates to the field of bathtub production equipment technology, specifically to a high-efficiency acrylic bathtub molding equipment, comprising a fixed platform, a mold, a clamp, and a composite heating and limiting mechanism. The composite heating and limiting mechanism includes a mounting frame, a mounting plate, a heating tube, at least two adjusting plates, and a posture adjustment driver. By setting a liftable composite heating and limiting mechanism above the fixed platform, when the adjusting plate is flipped to a vertical position, the heating tube radiates heat downwards to heat the acrylic sheet; when the adjusting plate is flipped to a horizontal position, the adjusting plates are joined together to form a flat limiting plane, limiting the blow-molded acrylic sheet. Thus, the heating and limiting functions are integrated into the same mechanism, solving the technical problems of existing equipment where the heater and limiting device are set separately, resulting in cumbersome processes, serious heat loss, poor positioning accuracy, and the need for separate heating of the limiting device.

Description

Technical Field

[0001] This invention relates to the field of bathtub production equipment technology, specifically to a high-efficiency acrylic bathtub molding equipment. Background Technology

[0002] In the manufacturing process of acrylic bathtubs, hot blow molding is usually used. The basic process is as follows: the cut acrylic sheet is fixed above the mold, the acrylic sheet is heated to a softened state by a heater, and then compressed air is introduced from below to make the softened acrylic sheet arch upward and fit into the upper mold or limiting device. After cooling and solidification, the bathtub shape is formed.

[0003] Currently, existing acrylic bathtub molding equipment typically employs a step-by-step process: First, a heater is moved above the acrylic sheet for heating; once the sheet softens, the heater is removed. Next, a limiting device is moved to a set height to prevent the acrylic sheet from excessively arching and becoming too thin. Then, a lower mold rises and enters the arched acrylic sheet, and a vacuum is applied to adhere the acrylic sheet to the mold surface. Finally, cooling and demolding are performed. During this process, because the limiting device directly contacts the high-temperature softened acrylic sheet, additional heating is required to prevent internal stress or surface defects caused by localized rapid cooling.

[0004] However, the existing equipment has significant technical drawbacks. First, the heater and the limiting device are two separate mechanisms, requiring the heater to be removed after heating and then the limiting device to be moved in. This process is cumbersome, the equipment occupies a large area, and heat loss is significant after the heater is removed, resulting in high energy consumption. Second, the alternating entry and exit of the heater and the limiting device makes it difficult to accurately and repeatedly position them, easily leading to uneven heating of the acrylic sheet or inconsistent limiting heights, affecting the molding quality. Third, the limiting device requires a separate heating system, further increasing the complexity of the equipment and manufacturing costs.

[0005] Therefore, how to simplify the equipment structure, reduce the number of process steps, and improve the synergistic efficiency of heating and limiting has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] To address the problems existing in the prior art, a high-efficiency acrylic bathtub molding equipment is provided. This equipment utilizes a liftable composite heating and limiting mechanism installed above a fixed platform. This mechanism integrates a mounting plate, heating elements, and at least two flip-up adjusting plates. When the adjusting plates are flipped to a vertical position, the heating elements radiate heat downwards to heat the acrylic sheet. When the adjusting plates are flipped to a horizontal position, the adjusting plates together form a flat limiting plane to limit the blow-molded acrylic sheet. This integrates heating and limiting functions into a single mechanism, solving the technical problems of existing equipment where the heater and limiting device are separate, leading to cumbersome processes, significant heat loss, poor positioning accuracy, and the need for separate heating of the limiting device.

[0007] To address the problems of existing technologies, this invention provides a high-efficiency acrylic bathtub molding equipment, comprising: a fixed platform with an opening, wherein a mold capable of being raised and lowered is disposed within the opening; a clamp disposed on the fixed platform and located at the edge of the opening for fixing an acrylic sheet to be molded; a composite heating and limiting mechanism disposed above the fixed platform in a raised and lowerable manner, comprising: a mounting frame; a mounting plate horizontally disposed on the mounting frame; a heating tube disposed on the mounting plate for generating heating heat; at least two adjusting plates rotatably disposed at the bottom of the mounting plate, each adjusting plate capable of rotating around one side between a vertical and a horizontal posture; and a posture adjustment driver disposed on the mounting frame and drively connected to the adjusting plates; wherein, when the adjusting plate rotates to a vertical posture, the heat generated by the heating tube radiates downwards to heat the acrylic sheet; when the adjusting plate rotates to a horizontal posture, the adjusting plates together form a flat limiting plane for limiting the acrylic sheet during blow molding.

[0008] Preferably, the composite heating limiting mechanism further includes a circulating metal strip; the circulating metal strip is horizontally disposed at the bottom of the mounting plate and close to the adjusting plate in a horizontal position; the circulating metal strip has a window for the adjusting plate in a vertical position to pass through; the two ends of the circulating metal strip respectively form a winding end and an unwinding end, used to realize winding and unwinding movements at the bottom of the mounting plate; wherein, when the window of the circulating metal strip moves to directly below the mounting plate, the heat of the heating tube radiates downward through the window of the circulating metal strip; when the solid surface of the circulating metal strip moves to directly below the mounting plate, the solid surface of the circulating metal strip adheres to the bottom surface of the adjusting plate which has been flipped to a horizontal position, and together with the adjusting plate, forms a limiting pressure surface.

[0009] Preferably, the composite heating limiting mechanism further includes: a take-up roller and an unwind roller, which are rotatably arranged on the top of the mounting frame, the take-up end of the circulating metal strip is wound around the take-up roller, and the unwind end of the circulating metal strip is wound around the unwind roller; a take-up motor and an unwind motor are both arranged on the mounting frame, the output shaft of the take-up motor is drivenly connected to the take-up roller, and the output shaft of the unwind motor is drivenly connected to the unwind roller.

[0010] Preferably, the composite heating limiting mechanism further includes two tension rollers rotatably disposed at both ends of the mounting frame, and the circulating metal belt is laid parallel to the bottom of the mounting plate after being bridging the tension rollers.

[0011] Preferably, the bottom end of the mounting plate is provided with reflective grooves at equal intervals along its length direction, the reflective grooves extend along the width direction of the mounting plate, the inner wall of the reflective grooves forms a reflective surface, and the heating tube is disposed in the reflective grooves.

[0012] Preferably, the two ends of the adjustment plate form pivots extending along its length, the pivots passing through and rotatably connected to the sidewalls of the mounting frame, and the attitude adjustment driver is synchronously connected to all the pivots.

[0013] Preferably, the attitude adjustment driver includes: a rack slidably disposed on the side of the mounting frame; a linear push rod disposed on the mounting frame, with its output rod being drively connected to the rack; and a gear coaxially fixedly disposed on each of the pivots, the gear meshing with the rack.

[0014] Preferably, the composite heating limiting mechanism further includes a lifting seat, the mounting frame is horizontally slidably disposed at the bottom of the lifting seat, and a reciprocating motion driver is provided between the lifting seat and the mounting frame for driving the mounting frame to reciprocate relative to the lifting seat in the horizontal direction.

[0015] Preferably, a drive groove is provided at the top of the mounting frame, the drive groove extends in a direction perpendicular to the sliding direction of the mounting frame, and the reciprocating motion drive includes: a reciprocating drive motor, which is mounted on the lifting seat; a rotating disk, which is coaxially fixedly mounted on the output shaft of the reciprocating drive motor, and an eccentric shaft is provided at the bottom of the rotating disk that is offset from the axis of the rotating disk, the eccentric shaft extending into the drive groove and slidingly engaging with it.

[0016] Preferably, the rotating disk is provided with a mounting groove extending radially therein, a sliding block is provided in the mounting groove, the eccentric shaft is provided at the bottom end of the sliding block, and the rotating disk is also provided with an adjusting screw threadedly connected thereto, one end of the adjusting screw extending into the mounting groove and rotatably connected to the sliding block.

[0017] The advantages of this application compared to the prior art are: This application integrates heating and limiting functions into a single composite heating and limiting mechanism. After heating, the limiting operation can be performed directly without removing the heater, reducing process steps and equipment footprint, avoiding heat loss during heater removal, and lowering energy consumption. Heating and limiting are completed by the same mechanism at the same station, eliminating positioning errors caused by the alternating entry and exit of the heater and limiting device, ensuring consistency between the heating and limiting areas, and improving molding accuracy.

[0018] When in a horizontal position, the adjustment plate directly serves as a limiting plane, located on the same mounting plate as the heating element. During limiting, the residual heat from the mounting plate and heating element provides insulation for the adjustment plate, eliminating the need for a separate limiting device and heating system. This simplifies the equipment structure and reduces manufacturing costs. The adjustment plate employs a flip-type structure, allowing the heating channel to be cleared when in a vertical position, and forming a limiting plane when in a horizontal position. The switching between these two positions is rapid and precise, adapting to the process sequence requirements of acrylic sheet heating and softening, and blow molding limiting.

[0019] The solid surface of the circulating metal strip in this application serves as a seamless covering layer, completely covering the joint gaps between the adjustment panels. This eliminates the problem of indentations on the acrylic panel surface caused by the gaps, improving the surface quality of the bathtub product. The solid surface is a continuous and complete plane, ensuring uniform pressure distribution when in contact with the acrylic panel, avoiding uneven thickness caused by localized pressure concentration. During the heating phase, the solid surface of the circulating metal strip absorbs some radiant heat and retains its own temperature during bonding, providing auxiliary insulation for the acrylic panel and preventing sudden cooling and deformation due to contact with a cold surface during the positioning process. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the molding process of an efficient acrylic bathtub molding equipment according to the present invention.

[0021] Figure 2 This is a perspective cross-sectional view of a composite heating and limiting mechanism in an acrylic bathtub molding equipment of the present invention.

[0022] Figure 3 yes Figure 2 A magnified view of part A.

[0023] Figure 4 This is a perspective view of a composite heating and limiting mechanism in an acrylic bathtub molding equipment of the present invention, which is used for high-efficiency production.

[0024] Figure 5 yes Figure 4 A magnified view of section B.

[0025] Figure 6 This is a schematic diagram showing the window of the circulating metal belt of the composite heating and limiting mechanism in a high-efficiency acrylic bathtub molding equipment of the present invention located at the bottom of the mounting plate.

[0026] Figure 7 yes Figure 6 A magnified view of a portion of point C.

[0027] Figure 8 This is a schematic diagram showing the solid surface of the circulating metal belt of the composite heating and limiting mechanism in a high-efficiency acrylic bathtub molding equipment of the present invention located at the bottom of the mounting plate.

[0028] Figure 9 This is an exploded perspective view of the reciprocating motion drive in a high-efficiency acrylic bathtub molding equipment according to the present invention.

[0029] Figure 10 yes Figure 9 A magnified view of a portion of point D.

[0030] Figure 11 This is a cross-sectional view of a composite heating and limiting mechanism in an acrylic bathtub molding equipment of the present invention, which is used for high-efficiency production.

[0031] Figure 12 yes Figure 11 A magnified view of a portion at point E.

[0032] Figure 13 This is a schematic diagram of the adjusting plate of the composite heating limiting mechanism in a high-efficiency acrylic bathtub molding equipment of the present invention when it is in a horizontal position.

[0033] Figure 14 This is an exploded perspective view of the circulating metal belt of the composite heating and limiting mechanism in a high-efficiency acrylic bathtub molding equipment of the present invention, with the window located at the bottom of the mounting plate.

[0034] Figure 15 This is an exploded perspective view of the solid surface of the circulating metal belt of the composite heating and limiting mechanism in a high-efficiency acrylic bathtub molding equipment of the present invention, when it is located at the bottom of the mounting plate.

[0035] The following are the labels in the diagram: 1. Fixed platform; 11. Mold; 12. Interface; 2. Fixture; 3. Composite heating and limiting mechanism; 31. Mounting frame; 311. Drive groove; 32. Mounting plate; 321. Reflection groove; 33. Heating tube; 34. Adjusting plate; 341. Pivot; 35. Attitude adjustment driver; 351. Rack; 352. Linear push rod; 353. Gear; 354. Positioning bolt; 361. Circulating metal belt; 3611. Window; 362. Take-up roller; 363. Unwind roller; 364. Take-up motor; 365. Unwind motor; 366. Tension roller; 367. Mounting block; 368. Tension spring; 38. Lifting seat; 391. Reciprocating drive motor; 392. Rotary disk; 393. Eccentric shaft; 394. Sliding block; 395. Adjusting screw. Detailed Implementation

[0036] 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.

[0037] like Figures 1 to 8 As shown, when the acrylic sheet is placed over the opening on the fixed platform 1, its interior is closed, and the bottom of the fixed platform 1 is provided with an interface 12 for inflating or deflating the fixed platform 1.

[0038] The equipment includes a fixed platform 1, a clamp 2, and a composite heating and limiting mechanism 3. The fixed platform 1 has an opening, within which a liftable mold 11 is installed for blow molding an acrylic sheet into a bathtub shape. The clamp 2 is mounted on the fixed platform 1 at the edge of the opening, used to clamp and fix the acrylic sheet to be molded above the fixed platform 1, forming a relatively closed chamber between the acrylic sheet and the fixed platform 1. An interface 12 is provided at the bottom of the fixed platform 1 for filling the fixed platform 1 with compressed air or drawing a vacuum. The composite heating and limiting mechanism 3 is mounted above the fixed platform 1 in a liftable manner, and includes a mounting frame 31, a mounting plate 32, a heating tube 33, at least two adjusting plates 34, and a posture adjustment driver 35. The mounting frame 31 is located above the fixed platform 1, providing support for all components.

[0039] Mounting plate 32 is horizontally mounted on mounting frame 31, serving as the support base for heating tube 33. Heating tube 33 is mounted on mounting plate 32 and generates heating heat. At least two adjusting plates 34 are rotatably mounted on the bottom of mounting plate 32, each capable of rotating between a vertical and horizontal orientation around one side. An orientation adjustment driver 35 is mounted on mounting frame 31 and connected to the adjusting plates 34, driving the adjusting plates 34 to switch between vertical and horizontal orientations. When the adjusting plates 34 are rotated to a vertical orientation, the heat generated by the heating tube 33 radiates downwards, heating the acrylic sheet; when the adjusting plates 34 are rotated to a horizontal orientation, the adjusting plates 34 together form a flat limiting plane, used to limit the acrylic sheet during blow molding.

[0040] During operation, the acrylic sheet to be formed is first placed on the fixed platform 1, and its edges are clamped and fixed by the clamp 2, forming a closed chamber between the acrylic sheet and the fixed platform 1. The composite heating limiting mechanism 3 descends to a position close to the acrylic sheet, and the attitude adjustment driver 35 drives the adjustment plate 34 to flip to a vertical position. The heating tube 33 is energized to generate heat, which radiates downwards to uniformly heat the acrylic sheet and soften it. After heating, compressed air is injected into the closed chamber through the interface 12 at the bottom of the fixed platform 1. The air pressure pushes the softened acrylic sheet to arch upwards. At the same time, the attitude adjustment driver 35 drives the adjustment plate 34 to flip from a vertical position to a horizontal position. The adjustment plates 34 are spliced ​​together to form a flat limiting plane. The composite heating limiting mechanism 3 descends to a set height, so that the acrylic sheet abuts against the limiting plane during the upward arching process, thereby limiting the arching height of the acrylic sheet and preventing it from being overstretched and becoming too thin. Subsequently, the mold 11 rises into the interior of the arched acrylic sheet, and a vacuum is drawn through the interface 12 to make the acrylic sheet fit tightly against the surface of the mold 11. After cooling and shaping, the finished product is demolded and taken out.

[0041] like Figure 6 , Figure 7 , Figure 8 , Figures 11 to 15As shown, the composite heating limiting mechanism 3 further includes a circulating metal strip 361; the circulating metal strip 361 is horizontally disposed at the bottom of the mounting plate 32 and close to the adjusting plate 34 which is in a horizontal position; the circulating metal strip 361 has a window 3611 for the adjusting plate 34 which is in a vertical position to pass through; the two ends of the circulating metal strip 361 respectively form a winding end and an unwinding end, used to realize winding and unwinding movements at the bottom of the mounting plate 32; wherein, when the window 3611 of the circulating metal strip 361 moves to directly below the mounting plate 32, the heat of the heating tube 33 is radiated downward through the window 3611 of the circulating metal strip 361; when the solid surface of the circulating metal strip 361 moves to directly below the mounting plate 32, the solid surface of the circulating metal strip 361 is in contact with the bottom surface of the adjusting plate 34 which has been flipped to a horizontal position, and together with the adjusting plate 34, forms a limiting pressure surface.

[0042] During the heating phase, the circulating metal belt 361 moves so that its window 3611 is directly below the mounting plate 32. The adjusting plate 34 flips to a vertical position, with its bottom end passing through the window 3611. The heat generated by the heating tube 33 radiates downwards to the acrylic plate through the window 3611, achieving uniform heating. In the switching phase after heating, the adjusting plate 34 flips from a vertical to a horizontal position. Multiple adjusting plates 34 are joined together to form a limiting plane, but there are gaps between adjacent adjusting plates 34. Subsequently, the circulating metal belt 361 moves its solid surface to directly below the mounting plate 32, with the solid surface adhering to the bottom surface of the now horizontal adjusting plate 34. Because the solid surface is a continuous and complete plane, it completely covers the gaps between adjacent adjusting plates 34, forming a seamless limiting pressure surface. Then, the composite heating limiting mechanism 3 descends to a set height, and the seamless limiting pressure surface limits the upward-arching acrylic plate. Because the limiting surface is continuous and flat, no indentations are produced on the acrylic plate surface.

[0043] The solid surface of the circulating metal strip 361 serves as a seamless covering layer, completely covering the splicing gaps between the adjustment plates 34. This eliminates the problem of indentations on the acrylic sheet surface caused by the gaps, improving the surface quality of the bathtub product. The solid surface is a continuous and complete plane, ensuring uniform pressure distribution when in contact with the acrylic sheet, avoiding uneven thickness caused by localized pressure concentration. During the heating phase, the solid surface of the circulating metal strip 361 absorbs some radiant heat and retains its own temperature during bonding, providing auxiliary insulation for the acrylic sheet and preventing sudden cooling and deformation due to contact with a cold surface during the positioning process.

[0044] like Figure 11 , Figure 14 and Figure 15As shown, the composite heating limiting mechanism 3 further includes: a take-up roller 362 and an unwind roller 363, which are rotatably arranged on the top of the mounting frame 31. The take-up end of the circulating metal strip 361 is wound around the take-up roller 362, and the unwind end of the circulating metal strip 361 is wound around the unwind roller 363. A take-up motor 364 and an unwind motor 365 are both arranged on the mounting frame 31. The output shaft of the take-up motor 364 is drivenly connected to the take-up roller 362, and the output shaft of the unwind motor 365 is drivenly connected to the unwind roller 363.

[0045] When the window 3611 of the circulating metal strip 361 needs to be moved directly below the mounting plate 32, the take-up motor 364 and the unwind motor 365 work together. The unwind motor 365 drives the unwind roller 363 to release the metal strip, and the take-up motor 364 drives the take-up roller 362 to wind up the metal strip. The speeds of the two motors are matched, allowing the circulating metal strip 361 to move smoothly. When the solid surface of the circulating metal strip 361 needs to be moved directly below the mounting plate 32, the take-up motor 364 and the unwind motor 365 work in opposite directions, again maintaining speed matching. Through the independent control of the take-up motor 364 and the unwind motor 365, the forward movement, reverse movement, and fixed-point stopping of the circulating metal strip 361 can be realized, precisely controlling the stopping position of the window 3611 or the solid surface below the mounting plate 32.

[0046] like Figure 14 and Figure 15 As shown, the composite heating limiting mechanism 3 also includes two tension rollers 366 rotatably disposed at both ends of the mounting frame 31, and the circulating metal belt 361 is laid parallel to the bottom of the mounting plate 32 after being straddled on the tension rollers 366.

[0047] The mounting frame 31 has sliding grooves at both ends, and mounting blocks 367 are provided in the sliding grooves. The end shaft of the tension roller 366 is rotatably mounted in the mounting block 367. A tension spring 368 is provided between the mounting block 367 and the end of the mounting frame 31 so that the two ends of the tension roller 366 have continuous tension, thereby tensioning the circulating metal strip 361.

[0048] The tension spring 368 continuously pulls the mounting block 367 along the sliding groove towards the end of the mounting frame 31, causing the mounting block 367 to move synchronously with the tension roller 366. Under the action of the tension spring 368, the tension roller 366 applies a continuous radial tension force to the circulating metal strip 361, ensuring that the circulating metal strip 361 remains straight and taut. When the circulating metal strip 361 undergoes slight elongation due to long-term use, the tension roller 366 automatically moves outward under the tension of the tension spring 368 to compensate for the elongation of the metal strip and maintain a constant tension force. The sliding groove guides the movement of the mounting block 367, ensuring that the movement distances at both ends of the tension roller 366 are consistent and preventing the tension roller 366 from becoming skewed.

[0049] like Figure 11 , Figure 12 and Figure 13 As shown, the bottom end of the mounting plate 32 is provided with reflective grooves 321 at equal intervals along its length direction. The reflective grooves 321 extend along the width direction of the mounting plate 32, and the inner wall of the reflective grooves 321 forms a reflective surface. The heating tube 33 is disposed in the reflective grooves 321.

[0050] When the heating element 33 is powered on, it generates heat. Some of this heat radiates directly downwards to the acrylic plate, while the rest radiates to the inner wall of the reflective groove 321. After being reflected by the reflective surface, the heat changes direction and scatters downwards or to the sides. Because the reflective grooves 321 are evenly distributed along the length of the mounting plate 32, the combined effect of multiple reflective grooves 321 transforms the point or linear heat source emitted by the heating element 33 into a planar heat source covering the entire bottom surface of the mounting plate 32. The reflective surface of the reflective groove 321 evenly disperses the heat, preventing overheating in the area directly below the heating element 33 while adjacent areas remain cold.

[0051] The reflective surface of the reflective groove 321 can be coated with a high-reflectivity coating (such as gold, aluminum, or chromium) to improve heat reflection efficiency, reduce upward heat loss, and direct more heat to the acrylic sheet, thus reducing energy consumption. The heating element 33 is embedded within the reflective groove 321, which also protects it from external impacts, reducing the risk of damage. The reflective groove 321 extends along its width, ensuring uniform heat diffusion throughout the acrylic sheet and maintaining consistent temperature across the entire heated area. The reflective groove 321 can be designed with an arc, V-shape, or trapezoidal cross-section, allowing for flexible design based on the shape of the heating element 33 and heat distribution requirements to optimize reflection efficiency.

[0052] like Figure 4 and Figure 5 As shown, the two ends of the adjustment plate 34 form pivots 341 extending along its length direction. The pivots 341 pass through the side wall of the mounting frame 31 and are rotatably connected to it. The attitude adjustment driver 35 is synchronously connected to all the pivots 341.

[0053] The attitude adjustment driver 35 outputs power, which simultaneously drives all pivots 341 to rotate synchronously via the transmission mechanism. Each pivot 341 drives the corresponding adjustment plate 34 to rotate synchronously, so that multiple adjustment plates 34 switch from a vertical attitude to a horizontal attitude, or from a horizontal attitude to a vertical attitude, at the same time and at the same speed and angle. Because all adjustment plates 34 move synchronously, after each adjustment plate 34 rotates to a horizontal attitude, the splicing gap between adjacent adjustment plates 34 is uniform and consistent, forming a flat limiting plane.

[0054] The attitude adjustment actuator 35 is synchronously connected to all pivots 341, ensuring that multiple adjustment plates 34 rotate simultaneously, at the same speed, and at the same angle, avoiding unevenness of the limiting plane or excessive gaps in the splicing due to asynchronous movements. The pivot 341 passes through the side wall of the mounting frame 31, setting the rotation fulcrum of the adjustment plate 34 outside the mounting frame 31, making full use of the space on both sides of the mounting frame 31, so that there is no extra protrusion at the bottom of the mounting plate 32, which facilitates the flatness and tensioning of the circulating metal strip 361.

[0055] like Figure 4 and Figure 5 As shown, the attitude adjustment driver 35 includes: a rack 351, which is slidably disposed on the side of the mounting frame 31; a linear push rod 352, which is disposed on the mounting frame 31 and whose output rod is connected to the rack 351 in a transmission manner; and a gear 353, which is coaxially fixedly disposed on each of the pivots 341 and meshes with the rack 351.

[0056] The rack 351 is provided with a positioning groove extending along its length. The mounting frame 31 is provided with a positioning bolt 354 on its side. The positioning bolt 354 passes through the positioning groove and is threadedly connected to the mounting frame 31. The bolt head of the positioning bolt 354 is slidably engaged with the outer edge of the positioning groove of the rack 351.

[0057] The linear push rod 352 extends or retracts, pushing the rack 351 to move linearly along the side of the mounting frame 31. As the rack 351 moves, it simultaneously drives all the gears 353 meshing with it to rotate synchronously. Each gear 353 drives the corresponding pivot 341 and adjusting plate 34 to rotate synchronously, allowing multiple adjusting plates 34 to switch between vertical and horizontal orientations simultaneously, at the same speed, and at the same angle. The engagement of the positioning groove and the positioning bolt 354 limits the maximum travel of the rack 351, thereby limiting the rotation angle range of the adjusting plates 34. The bolt cap of the positioning bolt 354 slides against the outer edge of the positioning groove, ensuring smooth movement of the rack 351 while preventing it from wobbling or disengaging during movement.

[0058] like Figure 9 and Figure 10 As shown, the composite heating limiting mechanism 3 also includes a lifting seat 38, and the mounting frame 31 is horizontally slidably disposed at the bottom of the lifting seat 38. A reciprocating motion driver is provided between the lifting seat 38 and the mounting frame 31 to drive the mounting frame 31 to reciprocate relative to the lifting seat 38 in the horizontal direction.

[0059] The lifting seat 38 drives the entire composite heating limiting mechanism 3 to rise or fall, adjusting the distance between it and the acrylic plate during heating or limiting. During heating, the reciprocating drive drives the mounting frame 31 to move horizontally relative to the lifting seat 38. The mounting frame 31 drives the mounting plate 32, heating tube 33, and adjusting plate 34 to move synchronously. As the heating tube 33 moves with the mounting frame 31, its heat radiation area continuously shifts across the acrylic plate surface, expanding the originally concentrated linear or point heat source into uniform heating covering the entire plate surface, avoiding localized overheating or uneven heating caused by the fixed arrangement of the heating tube 33.

[0060] This reciprocating moving structure allows the heating process to cover the entire acrylic panel area, making it particularly suitable for uniform heating of large bathtub panels and solving the problem that fixed heating tubes 33 cannot cover wide panels. After heating is complete, the mounting frame 31 can automatically return to its initial position, facilitating repeated positioning for the next heating cycle and ensuring consistency in batch production.

[0061] like Figure 9 and Figure 10 As shown, the top of the mounting frame 31 is provided with a drive groove 311, which extends in a direction perpendicular to the sliding direction of the mounting frame 31. The reciprocating motion drive includes: a reciprocating drive motor 391, which is disposed on the lifting seat 38; and a rotating disk 392, which is coaxially fixedly disposed on the output shaft of the reciprocating drive motor 391. The bottom end of the rotating disk 392 is provided with an eccentric shaft 393 that deviates from the axis of the rotating disk 392. The eccentric shaft 393 extends into the drive groove 311 and slides therewith.

[0062] The reciprocating drive motor 391 starts, driving the rotating disk 392 to rotate. The rotating disk 392 drives the eccentric shaft 393 to move in a circular motion around its axis. The eccentric shaft 393 slides within the drive groove 311. Since the drive groove 311 extends perpendicular to the sliding direction of the mounting frame 31, the circular motion of the eccentric shaft 393 is constrained to be the linear reciprocating motion of the drive groove 311, thereby driving the mounting frame 31 to reciprocate horizontally relative to the lifting seat 38. The eccentricity of the eccentric shaft 393 determines the reciprocating stroke of the mounting frame 31, and the rotational speed of the rotating disk 392 determines the moving speed.

[0063] like Figure 9 and Figure 10 As shown, the rotating disk 392 is provided with a mounting groove extending radially therein, and a sliding block 394 is provided in the mounting groove. The eccentric shaft 393 is provided at the bottom end of the sliding block 394. The rotating disk 392 is also provided with an adjusting screw 395 threadedly connected thereto. One end of the adjusting screw 395 extends into the mounting groove and is rotatably connected to the sliding block 394.

[0064] Rotating the adjusting screw 395 causes it to move axially relative to the rotating disk 392, pushing the sliding block 394 to slide along the mounting groove, thus changing the radial position of the sliding block 394 on the rotating disk 392. The sliding block 394 drives the eccentric shaft 393 to move, thereby changing the distance between the eccentric shaft 393 and the rotation axis of the rotating disk 392, i.e., changing the eccentricity. After the eccentricity adjustment is completed, the reciprocating drive motor 391 starts, driving the rotating disk 392 to rotate. The eccentric shaft 393 drives the mounting frame 31 to reciprocate through the drive groove 311, and its travel distance is proportional to the eccentricity. When it is necessary to replace acrylic sheets of different sizes, only rotating the adjusting screw 395 to adjust the eccentricity is needed to change the heating stroke, without replacing the rotating disk 392 or the eccentric shaft 393.

[0065] 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 high-efficiency acrylic bathtub molding equipment, characterized in that, include: A fixed platform with an opening thereon, and a mold that can be raised and lowered is installed in the opening; A clamp is provided on the fixing platform and located at the edge of the opening for fixing the acrylic sheet to be formed; A composite heating limiting mechanism, which is vertically movable and positioned above the fixed platform, includes: Mounting framework; The mounting plate is horizontally positioned on the mounting frame; A heating element, mounted on the mounting plate, is used to generate heating heat; At least two adjustment plates are rotatably mounted on the bottom of the mounting plate, and each adjustment plate can be flipped between a vertical and a horizontal position around one side of it. An attitude adjustment driver is mounted on the mounting frame and is connected to the adjustment plate in a driving manner. When the adjustment plate is flipped to a vertical position, the heat generated by the heating tube radiates downwards to heat the acrylic sheet; when the adjustment plate is flipped to a horizontal position, all the adjustment plates are spliced ​​together to form a flat limiting plane, which is used to limit the acrylic sheet during blow molding.

2. The high-efficiency acrylic bathtub molding equipment according to claim 1, characterized in that, The composite heating limiting mechanism also includes a circulating metal strip; the circulating metal strip is horizontally disposed at the bottom of the mounting plate and close to the adjusting plate in a horizontal position; the circulating metal strip has a window for the adjusting plate in a vertical position to pass through; the two ends of the circulating metal strip are respectively formed as a winding end and an unwinding end, for realizing winding and unwinding movements at the bottom of the mounting plate; Specifically, when the window of the circulating metal strip moves to directly below the mounting plate, the heat from the heating tube radiates downward through the window of the circulating metal strip; when the solid surface of the circulating metal strip moves to directly below the mounting plate, the solid surface of the circulating metal strip adheres to the bottom surface of the adjustment plate, which has been flipped to a horizontal position, and together with the adjustment plate, forms a limiting pressure surface.

3. The high-efficiency acrylic bathtub molding equipment according to claim 2, characterized in that, The composite heating limiting mechanism also includes: A take-up roller and an unwind roller are arranged in parallel rotation on the top of the mounting frame. The take-up end of the circulating metal strip is wound around the take-up roller, and the unwind end of the circulating metal strip is wound around the unwind roller. Both the winding motor and the unwinding motor are mounted on the mounting frame. The output shaft of the winding motor is drivenly connected to the winding roller, and the output shaft of the unwinding motor is drivenly connected to the unwinding roller.

4. The high-efficiency acrylic bathtub molding equipment according to claim 3, characterized in that, The composite heating limiting mechanism also includes two tension rollers rotatably disposed at both ends of the mounting frame, and the circulating metal belt is laid parallel to the bottom of the mounting plate after being straddled on the tension rollers.

5. A high-efficiency acrylic bathtub molding equipment according to any one of claims 1-4, characterized in that, The bottom end of the mounting plate is provided with reflective grooves at equal intervals along its length direction. The reflective grooves extend along the width direction of the mounting plate, and the inner wall of the reflective grooves forms a reflective surface. The heating tube is disposed in the reflective groove.

6. A high-efficiency acrylic bathtub molding equipment according to any one of claims 1-4, characterized in that, The two ends of the adjustment plate form pivots extending along its length, the pivots passing through and rotatably connected to the sidewalls of the mounting frame, and the attitude adjustment driver is synchronously connected to all the pivots.

7. The high-efficiency acrylic bathtub molding equipment according to claim 6, characterized in that, The attitude adjustment driver includes: The rack is slidably mounted on the side of the mounting frame; A linear push rod is mounted on the mounting frame, and the output rod is connected to the rack and pinion drive. Gears are coaxially fixed on each of the pivots, and the gears mesh with the rack.

8. A high-efficiency acrylic bathtub molding equipment according to any one of claims 1-4, characterized in that, The composite heating limiting mechanism also includes a lifting seat, and the mounting frame is horizontally slidably disposed at the bottom of the lifting seat. A reciprocating motion driver is provided between the lifting seat and the mounting frame to drive the mounting frame to reciprocate relative to the lifting seat in the horizontal direction.

9. The high-efficiency acrylic bathtub molding equipment according to claim 8, characterized in that, A drive groove is provided at the top of the mounting frame, the drive groove extending in a direction perpendicular to the sliding direction of the mounting frame, and the reciprocating motion driver includes: A reciprocating drive motor is mounted on the lifting base; A rotating disk is coaxially fixed on the output shaft of the reciprocating drive motor. An eccentric shaft offset from the axis of the rotating disk is provided at the bottom end of the rotating disk. The eccentric shaft extends into the drive groove and slides therewith.

10. The high-efficiency acrylic bathtub molding equipment according to claim 9, characterized in that, The rotating disk is provided with a mounting groove extending radially therein, and a sliding block is provided in the mounting groove. The eccentric shaft is provided at the bottom end of the sliding block. The rotating disk is also provided with an adjusting screw threadedly connected thereto. One end of the adjusting screw extends into the mounting groove and is rotatably connected to the sliding block.

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