Forming method of spa hydrotherapy massage cylinder

Abstract

The invention relates to the technical field of massage cylinders, in particular to a spa hydrotherapy massage cylinder forming method which comprises the steps that S1, a plate is prepared; s2, cleaning a die cavity; s3, plate cleaning and feeding; s4, plate heating; s5, negative pressure forming; s6, cooling is conducted; s7, blanking is conducted; and S8, quality inspection. The spa hydrotherapy massage cylinder has the effect of improving the forming quality of the spa hydrotherapy massage cylinder.

Description

Technical Field

[0001] The present application relates to the technical field of massage bathtubs, and in particular to a forming method for a spa hydrotherapy massage bathtub. Background Art

[0002] As a high-end bathroom product, the forming quality of a spa hydrotherapy massage bathtub directly affects the product appearance, structural strength and user experience.

[0003] Currently, the invention patent with the publication number CN105128317A discloses a bathtub forming method, including the following steps: a. Providing a heating device to heat and soften an acrylic plate; b. Providing a pneumatic device to perform a deformation operation on the heated and softened acrylic plate. The edge of the acrylic plate is clamped by a clamping mechanism, and the plate surface within the clamping area is freely and preliminarily deformed into a curved plate without restraint. The edge of the area surrounded by the clamping mechanism is consistent with the cavity edge contour of the forming mold; c. Clamping and fixing the above-mentioned curved plate at the cavity edge of the forming mold, and performing an adsorption operation by connecting to the vacuum environment of the forming mold cavity; d. Removing the restraint of the clamping mechanism and demolding to take out the formed part. First, the softened acrylic plate is uniformly deformed into a curved plate with a uniform thickness. The process from the curved plate to the formed part only changes the shape of the curved plate, and the change in the plate surface area is not large. Therefore, the wall thickness of the formed bathtub part is relatively uniform.

[0004] However, since the acrylic plate is easily affected by dust, impurities or mold residues during the heating and softening process, resulting in particle protrusions, scratches or uneven thickness on the surface after forming, thus affecting the forming quality of the spa hydrotherapy massage bathtub. Therefore, before the softening and forming operation of the acrylic plate, it is necessary to ensure the cleanliness of the forming surface of the acrylic plate and the mold cavity. Summary of the Invention

[0005] In order to improve the forming quality of a spa hydrotherapy massage bathtub, the present application provides a forming method for a spa hydrotherapy massage bathtub.

[0006] The forming method for a spa hydrotherapy massage bathtub provided by the present application adopts the following technical solutions: A forming method for a spa hydrotherapy massage bathtub includes the following steps: S1: Prepare the plate, prepare the acrylic plate to be processed and stack it on the loading platform; S2: Clean the mold cavity, prepare at least two working stations of the massage bathtub forming mold, and perform dust-free cleaning on the forming mold cavity respectively; S3: Clean and load the plate, use a robotic arm to transport the acrylic plate to the cleaning platform, clean the dust on the forming surface of the acrylic plate through the cleaning structure on the cleaning platform, and then transport and fix the acrylic plate to the cavity opening of the forming mold; S4: Plate heating. Move the electric radiation plate above the acrylic plate and use the electric radiation plate to heat the plate in a region to soften the acrylic plate. S5: Negative pressure forming. Create a vacuum negative pressure zone in the cavity of the forming mold, and suction and attach the softened acrylic plate to the inner wall of the cavity to form a prototype of the massage tub. S6: Cooling. Use a hair dryer to cool down the massage tub. S7: Blanking. Use a robotic arm to separate the massage tub from the forming mold and transport the massage tub to the inspection table. S8: Quality inspection. Suspend the massage tub and tilt it at an angle to observe the surface forming quality of the massage tub.

[0007] By adopting the above technical solution, in the above steps, finally, the acrylic plate is formed into a massage tub according to the shape of the cavity of the forming mold. Before the operation, the cavity of the forming mold is cleaned dust-free in advance to ensure the cleanliness of the cavity and avoid defects on the surface of the massage tub caused by particles and other protrusions. At the same time, before the acrylic plate is formed, the forming surface of the acrylic plate is cleaned through a cleaning structure to reduce the particulate impurities adhered to the forming surface of the acrylic plate, which is ultimately beneficial to improving the forming quality of the spa water massage tub.

[0008] Optionally, in step S2, the following steps are further included: S2.1: Perform three-dimensional scanning adsorption treatment on the surface of the cavity using a negative pressure dust suction device. The negative pressure dust suction device is equipped with an adjustable suction nozzle, and the end of the suction nozzle is connected to a nano-level filter screen. The adsorption pressure is controlled between -0.06 MPa and -0.1 MPa. S2.2: Use an electrostatic elimination type dust-free cloth in cooperation with a volatile organic solvent cleaner to perform a one-way wiping operation along the curved surface of the cavity. The wiping pressure is maintained at 0.15 - 0.3 N / cm². S2.3: Use a temperature-controllable compressed gas purging system to perform a 360° circumferential purge on the cavity. The compressed gas is nitrogen that has been dried by a molecular sieve, the purge pressure is 0.4 - 0.6 MPa, and the gas temperature is maintained at 40 - 50 °C. S2.4: Uniformly coat a photocurable anti-fouling coating on the surface of the cavity. The coating thickness is 5 - 8 μm, and the anti-fouling coating contains nano-titanium dioxide components. S2.5: Use a UV irradiation device (501) with a wavelength of 365 nm to perform a three-dimensional irradiation treatment on the cavity. The irradiation intensity reaches 1200 - 1500 μW / cm², and the duration is 8 - 12 minutes.

[0009] By adopting the above technical solutions, before the operation, it is necessary to clean the cavity of the forming mold dust-free. Nanoscale particles are removed through negative pressure adsorption, avoiding secondary dust pollution caused by traditional compressed air blowing. The static electricity elimination cloth and directional wiping synchronously solve the problems of mechanical friction electrification and organic residues. The temperature-controlled nitrogen blowing keeps the cavity dry while removing solvent residues (dew point ≤ -40°C). The photocurable anti-fouling coating forms a durable anti-adhesion surface, reducing the demolding force in subsequent forming operations by more than 30%. The three-dimensional UV curing ensures the curing uniformity of the coating on complex curved surfaces (hardness deviation ≤ 2H).

[0010] Optionally, in the step S2.2, the static electricity elimination type dust-free cloth adopts a mixed structure of ultra-fine polyester fibers and stainless steel wires. The diameter of the metal wire is 0.02 - 0.05 mm, and it is spirally embedded in the fiber layer.

[0011] By adopting the above technical solutions, the mixed structure of stainless steel wires stabilizes the surface resistance at 10^6 - 10^8 Ω, shortens the static electricity dissipation time to < 0.5 seconds. The spiral metal wires enhance the mechanical strength of the cloth, and the single cloth reuse times are increased to more than 50 times. The polyester substrate with a fiber density of 5000 - 6000 fibers / cm² ensures that the capture rate of 0.1 μm level particles > 99.2%, which is beneficial to improving the forming quality of the massage cylinder.

[0012] Optionally, in the step S2.3, the compressed gas blowing system includes a multi-stage pressure regulation module, and the module is configured with a piezoelectric ceramic micro-adjusting valve, which can control the pressure fluctuation range within ±0.02 MPa.

[0013] By adopting the above technical solutions, the piezoelectric ceramic valve realizes a millisecond-level pressure response, the blowing flow rate volatility < 2%. The multi-stage regulation module stabilizes the gas flow velocity at 25 ± 0.5 m / s, reduces the turbulence intensity to less than 5%, and the temperature control accuracy reaches ±0.5°C, avoiding thermal deformation of the cavity (size change < 0.01 mm).

[0014] Optionally, in the step S2.4, the photocurable anti-fouling coating forms a micro-nano composite structure surface after curing, with a static water contact angle ≥ 150° and a surface energy ≤ 18 mN / m.

[0015] By adopting the above technical solutions, the micro-nano composite structure reduces the adhesion energy of organic pollutants to < 0.5 mJ / m². The super-hydrophobic surface reduces the residual amount of the demolding agent by more than 85%. The photocatalytic property of nano-titanium dioxide extends the self-cleaning cycle of the coating to 6 months.

[0016] Optionally, the cleaning structure includes a cleaning unit. A moving seat is movably arranged on the top surface of the cleaning platform. The cleaning unit is movably arranged on the top surface of the moving seat. The moving seat is provided with a reciprocating mechanism for driving the cleaning unit to reciprocate.

[0017] By adopting the above technical solution, when it is necessary to clean the particulate impurities adhering to the forming surface of the acrylic plate, first, the acrylic plate is transported above the moving seat by the robotic arm. At this time, the cleaning unit abuts against the forming surface of the acrylic plate. When the moving seat moves, the moving seat drives the cleaning unit to move. At this time, the cleaning unit cleans the forming surface of the acrylic plate. At the same time, under the action of the reciprocating mechanism, the cleaning unit simulates manual wiping of the forming surface of the acrylic plate, thereby further improving the cleaning cleanliness.

[0018] Optionally, the reciprocating mechanism includes a disc and a connecting rod. The disc is rotatably arranged above the moving seat. The connecting rod is arranged between the disc and the cleaning unit. One end of the connecting rod is eccentric and hinged to the disc, and the other end of the connecting rod is hinged to the cleaning unit. The moving seat is provided with a transmission component for driving the disc to rotate.

[0019] By adopting the above technical solution, when the disc is driven to rotate by the transmission component, the disc drives the movement through the connecting rod. And under the continuous rotation of the disc, the disc drives the cleaning unit to reciprocate on the moving seat through the connecting rod. At this time, the cleaning unit simulates the way of manual reciprocating wiping, and carefully wipes and cleans the forming surface of the acrylic plate, so as to ensure that the particulate impurities are completely separated from the forming surface of the acrylic plate.

[0020] Optionally, the transmission component includes a circular gear, a first bevel gear and a second bevel gear. A rack is arranged on the top surface of the cleaning platform. The circular gear is rotatably arranged on the bottom surface of the moving seat. The circular gear meshes with the rack. The first bevel gear is coaxially connected to the circular gear. The second bevel gear is coaxially connected to the disc. The first bevel gear meshes with the second bevel gear.

[0021] By adopting the above technical solution, when the moving seat moves on the cleaning platform, the circular gear rotates by meshing with the rack. The circular gear coaxially drives the first bevel gear to rotate. The first bevel gear drives the second bevel gear to rotate. The second bevel gear coaxially drives the disc to rotate. The disc then drives the cleaning unit to reciprocate through the eccentrically connected connecting rod, which is beneficial to improving the stability of the cleaning unit simulating manual reciprocating wiping.

[0022] Optionally, the cleaning unit includes a fixed cylinder and a cleaning handle. The cleaning handle is slidably connected to the fixed cylinder. A cleaning cloth is provided at the top end of the cleaning handle. A spring is provided inside the fixed cylinder. One end of the spring is connected to the inner bottom wall of the fixed cylinder, and the other end of the spring is connected to the bottom end of the cleaning handle.

[0023] By adopting the above technical solution, when the acrylic plate is transported above the cleaning platform by the robotic arm, the acrylic plate presses the cleaning cloth, and the cleaning cloth squeezes the spring through the cleaning handle, so as to ensure that the cleaning cloth always presses against the forming surface of the acrylic plate, which is beneficial to improving the stability of the cleaning cloth to clean the forming surface of the acrylic plate.

[0024] In summary, the present application includes the following beneficial technical effects: In the above steps, finally, the acrylic plate is formed into a massage cylinder according to the shape of the cavity of the forming mold. Before the operation, the cavity of the forming mold is cleaned dust-free in advance to ensure the cleanliness of the cavity and avoid the appearance of defects on the surface of the massage cylinder due to protrusions such as particles. At the same time, before the acrylic plate is formed, the forming surface of the acrylic plate is cleaned by the cleaning structure to reduce the particulate impurities adhered to the forming surface of the acrylic plate, which is ultimately beneficial to improving the forming quality of the spa water massage cylinder. Description of the Drawings

[0025] Figure 1 are the steps of the forming method of the spa water massage cylinder of the present application; Figure 2 is the overall structural schematic diagram of the cleaning structure of the present application; Figure 3 is of the present application Figure 2 enlarged view of part A; Figure 4 is the side cross-sectional view of the cleaning unit of the present application.

[0026] Description of the reference numerals: 1, cleaning platform; 2, moving seat; 3, cleaning unit; 4, disc; 5, connecting rod; 6, circular gear; 7, first bevel gear; 8, second bevel gear; 9, rack; 10, motor; 11, reciprocating lead screw; 12, guide rod; 13, moving groove; 14, guide groove; 15, fixed cylinder; 16, cleaning handle; 17, cleaning cloth; 18, spring; 19, bracket; 20, slider; 21, collection box. Detailed Description of the Embodiment

[0027] The following further Figures 1-4 describes the present application in detail with reference to the attached

[0028] Refer to Figure 1 , a forming method of a spa water massage cylinder, including the following steps: S1: Prepare a plurality of acrylic plates to be processed, and stack the plurality of acrylic plates to be processed on a loading platform; S2: Cleaning the mold cavity. Prepare at least two massage cylinder molding molds. The two molding molds are processing positions of two acrylic plates. Before the molding operation, clean the two molding mold cavities in advance. S3: Plate cleaning and loading, firstly, one of the acrylic plates is moved to the cleaning platform 1 by the robot arm. It should be noted that the robot arm moves the acrylic plate by suction with a suction cup. Then, the molding surface (bottom surface) of the acrylic plate is cleaned of dust by the cleaning structure on the cleaning platform 1. After cleaning, the acrylic plate is moved to the cavity of a molding mold and fixed therein; S4: Heating the plate, moving the electric radiation plate to the top of the acrylic plate, wherein the electric radiation heating plate includes a plurality of heating modules, and the plurality of heating modules are arranged in parallel, so that the electric radiation heating plate has the function of heating in designated zones as required, and the top surface of the acrylic plate is heated to soften the acrylic plate; S5: Negative pressure molding, the acrylic sheet fixed to the cavity of the molding mold forms a vacuum negative pressure zone with the inner cavity of the molding mold. Under the action of negative pressure, the softened acrylic sheet is sucked and adheres to the inner wall of the mold cavity, thereby forming a prototype of a massage bathtub; S6: Cooling, use a hair dryer or other cooling equipment to blow air into the massage bathtub until it is completely cooled down; S7: Unloading, unlocking the massage cylinder, and then using the robotic arm to absorb the massage cylinder to separate the massage cylinder from the mold cavity, and then moving the massage cylinder to the inspection table; S8: Quality inspection. On the inspection table, the massage cylinder is suspended in the air through the lifting structure and tilted and rotated 135 degrees. The lifting structure is mainly clamped, lifted and rotated by the clamping arm. Then, by observing the flatness and defects on the surface of the massage cylinder, the molding yield rate of the massage cylinder is registered and filled in.

[0029] By repeating the above steps, the acrylic sheet is placed and fixed in two processing positions respectively, and finally the acrylic sheet is formed into a massage bathtub according to the shape of the mold cavity of the forming mold. Before the forming operation, the mold cavity of the forming mold is cleaned in advance to ensure the cleanliness of the mold cavity and avoid defects on the surface of the massage bathtub caused by protrusions such as particles. At the same time, before the acrylic sheet is transported to the cavity, the molding surface of the acrylic sheet is cleaned by a cleaning mechanism to reduce the particle impurities adhering to the molding surface of the acrylic sheet, which is beneficial to improve the molding quality of the spa massage bathtub.

[0030] Specifically, step S2 also includes the following steps: S2.1: Use a negative pressure dust suction device to perform three-dimensional scanning adsorption treatment on the surface of the mold cavity. The negative pressure dust suction device is equipped with an adjustable nozzle, and the end of the nozzle is connected to a nano-level filter screen. The adsorption pressure is controlled between -0.06 MPa and -0.1 MPa; S2.2: Use an electrostatic elimination type dust-free cloth in combination with a volatile organic solvent cleaner to perform a one-way wiping operation along the curved surface of the mold cavity. The wiping pressure is maintained at 0.15 - 0.3 N / cm²; S2.3: Use a temperature-controlled compressed gas purging system to perform a 360° circumferential purge on the mold cavity. The compressed gas is nitrogen that has been dried by molecular sieve treatment. The purge pressure is 0.4 - 0.6 MPa, and the gas temperature is maintained at 40 - 50 °C; S2.4: Uniformly coat a photocurable anti-fouling coating on the surface of the mold cavity. The coating thickness is 5 - 8 μm, and the anti-fouling coating contains nano-titanium dioxide components; S2.5: Use a UV irradiation device with a wavelength of 365 nm to perform a three-dimensional irradiation treatment on the mold cavity. The irradiation intensity reaches 1200 - 1500 μW / cm², and the duration is 8 - 12 minutes.

[0031] Before the operation, it is necessary to perform dust-free cleaning on the mold cavity of the molding die. The nano-level particles are removed through negative pressure adsorption to avoid secondary dust pollution caused by traditional compressed air purging. The electrostatic elimination cloth and directional wiping synchronously solve the problems of mechanical friction electrification and organic residue. The temperature-controlled nitrogen purging keeps the mold cavity dry while removing solvent residues (dew point ≤ -40 °C). The photocurable anti-fouling coating forms a durable anti-adhesion surface, reducing the demolding force in subsequent molding operations by more than 30%. The three-dimensional UV curing ensures the curing uniformity of the coating on complex curved surfaces (hardness deviation ≤ 2H).

[0032] Specifically, in step S2, the electrostatic elimination type dust-free cloth adopts a mixed structure of ultra-fine polyester fiber and stainless steel wire. The diameter of the metal wire is 0.02 - 0.05 mm, and it is spirally embedded in the fiber layer.

[0033] The mixed structure of stainless steel wire stabilizes the surface resistance at 10^6 - 10^8 Ω, and the electrostatic dissipation time is shortened to < 0.5 seconds; the spiral metal wire enhances the mechanical strength of the cloth, and the single cloth reuse times are increased to more than 50 times; the polyester base with a fiber density of 5000 - 6000 roots / cm² ensures that the capture rate of 0.1 μm-level particles > 99.2%.

[0034] Specifically, in step S2, the organic solvent cleaner contains by mass percentage: ethyl acetate 35 - 45%, isoparaffin solvent 25 - 30%, perfluoropolyether 15 - 20%, antioxidant 0.5 - 1%.

[0035] The compounding of ethyl acetate and isoparaffin enables the synchronous dissolution of polar / non-polar pollutants (Kauri-Butanol value reaches 600); the perfluoropolyether component reduces the surface tension of the solution to 18 mN / m and shortens the penetration time by 60%; the antioxidant inhibits the oxidative decomposition of the solvent and extends the storage stability to 18 months.

[0036] Specifically, the compressed gas purging system in step S3 includes a multi-stage pressure regulation module, and the module is configured with a piezoelectric ceramic micro-adjusting valve, which can control the pressure fluctuation range within ±0.02 MPa.

[0037] The piezoelectric ceramic valve achieves a millisecond-level pressure response, and the purging flow rate volatility < 2%; the multi-stage regulation module stabilizes the gas flow rate at 25 ± 0.5 m / s and reduces the turbulence intensity to less than 5%; the temperature control accuracy reaches ±0.5 °C to avoid thermal deformation of the mold cavity (size change < 0.01 mm).

[0038] Specifically, the photocurable antifouling coating in step S4 forms a micro-nano composite structure surface after curing, with a static water contact angle ≥ 150° and a surface energy ≤ 18 mN / m.

[0039] The micro-nano composite structure reduces the adhesion energy of organic pollutants to < 0.5 mJ / m²; the superhydrophobic surface reduces the residual amount of mold release agent by more than 85%; the photocatalytic property of nano-titanium dioxide extends the self-cleaning cycle of the coating to 6 months.

[0040] Specifically, the ultraviolet irradiation device in step S5 includes a programmable robotic arm, and a focused UV-LED array is installed at the end of the robotic arm, which can achieve an equidistant movement of 5 ± 0.5 mm from the curved surface of the mold cavity.

[0041] The equidistant movement control makes the difference in the irradiation dose on the curved surface < 5%; the light intensity uniformity of the UV-LED array reaches 90%, and the curing efficiency is increased by 3 times; the trajectory planning accuracy of the robotic arm is 0.02 mm to avoid local over-curing of the coating.

[0042] Specifically, after step S5, there is also a quality inspection step: using a laser particle counter to detect the residual particles in the mold cavity, and it is determined to be qualified when the number of particles with a particle size > 0.3 μm detected is < 100 pieces / m³.

[0043] The detection sensitivity of the laser particle counter reaches 0.1 μm, and the accuracy is improved by 2 orders of magnitude compared with the traditional gravimetric method; the dynamic detection mode can identify the invisible pollution in the dead corners of the mold cavity; the quantitative index increases the qualified rate of the cleaning process from 78% to 99.5%.

[0044] Through the above steps, the following have been achieved collaboratively: 1) The cavity cleanliness has reached Class 4 of ISO 14644-1 standard; 2) The mold maintenance cycle has been extended from 20 molding times to 200 times; 3) The surface defect rate of the product has been reduced from 3% to below 0.05%. A technical closed-loop with both high-efficiency cleaning and long-term protection has been formed.

[0045] Specifically, referring to Figure 2 , the cleaning structure in step S3 includes a cleaning module. A moving seat 2 is movably installed on the top surface of the cleaning platform 1, and the cleaning platform 1 is equipped with a driving component for driving the moving seat 2 to move. A cleaning unit 3 is reciprocally movably installed on the top surface of the moving seat 2 through a track, and the cleaning unit 3 is used for wiping the molding surface of the acrylic plate. A reciprocating mechanism is also installed, and the reciprocating mechanism is used for driving the cleaning unit 3 to reciprocate.

[0046] Specifically, referring to Figure 2 and Figure 3 , the reciprocating mechanism includes a disc 4 and a connecting rod 5. The disc 4 is horizontally arranged, and the disc 4 is rotatably installed above the moving seat 2 through a bracket 19. The connecting rod 5 is located between the disc 4 and the cleaning unit 3, and one end of the connecting rod 5 is eccentrically hinged to the top surface of the disc 4. The other end of the connecting rod 5 is hinged to the cleaning unit 3.

[0047] In addition, the moving seat 2 is also equipped with a transmission component. The transmission component includes a circular gear 6, a first bevel gear 7, and a second bevel gear 8. A rack 9 is fixedly connected to the top surface of the cleaning platform 1. The circular gear 6 is rotatably installed on the bottom surface of the moving seat 2, and the circular gear 6 meshes with the rack 9. The first bevel gear 7 is coaxially fixedly connected to the circular gear 6 through a shaft, the second bevel gear 8 is coaxially fixedly connected to the disc 4 through a shaft, and the first bevel gear 7 meshes with the second bevel gear 8.

[0048] When the driving component drives the moving seat 2 to move along the length direction of the cleaning platform 1, under the action of the rack 9, the circular gear 6 rotates. The circular gear 6 drives the first bevel gear 7 to rotate through a shaft, the first bevel gear 7 drives the second bevel gear 8 to rotate, the second bevel gear 8 drives the disc 4 to rotate, and the disc 4 thus drives the cleaning unit 3 to reciprocate on the moving seat 2 through the connecting rod 5. The reciprocating cleaning unit 3 simulates the way of manual reciprocating wiping to carefully wipe and clean the molding surface of the acrylic plate, so as to ensure that particulate impurities are completely separated from the molding surface of the acrylic plate.

[0049] Specifically, referring to Figure 2, the driving assembly includes a motor 10, a reciprocating lead screw 11 and a guide rod 12. A moving groove 13 and a guide groove 14 are respectively formed on the top surface of the cleaning platform 1. The reciprocating lead screw 11 is rotatably connected in the moving groove 13. The motor 10 is fixed on the side wall of the cleaning platform 1. The driving shaft of the motor 10 extends into the moving groove 13, and the driving shaft of the motor 10 is coaxially and fixedly connected with the reciprocating lead screw 11. The guide rod 12 is fixedly connected in the guide groove 14. Corresponding to the positions of the moving groove 13 and the guide groove 14, a slider 20 is fixedly connected to the bottom surface of the moving seat 2. The reciprocating lead screw 11 is threadedly connected with the corresponding slider 20, and the guide rod 12 is slidably connected with the corresponding slider 20.

[0050] When the motor 10 is driven, the driving shaft of the motor 10 drives the reciprocating lead screw 11 to rotate. Under the guiding action of the guide rod 12, the reciprocating lead screw 11 drives the moving seat 2 to reciprocate on the cleaning platform 1 through the slider 20.

[0051] See Figure 4 , for the sake of the stability of the cleaning unit 3 to clean the forming surface of the acrylic plate, the cleaning unit 3 includes a fixed cylinder 15 and a cleaning handle 16. The bottom end of the cleaning handle 16 is slidably connected with the fixed cylinder 15, and a cleaning cloth 17 is detachably installed at the top end of the cleaning handle 16. A spring 18 is installed in the fixed cylinder 15. One end of the spring 18 is fixedly connected with the inner bottom wall of the fixed cylinder 15, and the other end of the spring 18 is fixedly connected with the bottom end of the cleaning handle 16.

[0052] When the robotic arm transports the acrylic plate above the cleaning platform 1, the forming surface of the acrylic plate presses the cleaning cloth 17, and the cleaning cloth 17 squeezes the spring 18 through the cleaning handle 16. Finally, the cleaning cloth 17 is stably pressed against the forming surface of the acrylic plate.

[0053] It is worth mentioning that, see Figure 4 , a collection box 21 is annularly arranged on the side wall of the fixed cylinder 15. The collection box 21 is used to collect dust and other impurities wiped off by the cleaning cloth 17.

[0054] The working principle of a forming method of a spa hydrotherapy massage tub: Through preparing the plate, cleaning the mold cavity, cleaning and loading the plate, heating the plate, vacuum forming, cooling, unloading and quality inspection, finally the acrylic plate is formed into a massage tub.

[0055] Before the forming operation, the mold cavity of the forming mold is cleaned dust-free in advance to ensure the cleanliness of the mold cavity and avoid defects on the surface of the massage tub caused by particles and other protrusions.

[0056] When it is necessary to clean the forming surface of the acrylic plate, first, the mechanical plate is used to transport the acrylic plate above the cleaning platform 1 and make the acrylic plate abut against the cleaning cloth 17. Then, the motor 10 is started. The driving shaft of the motor 10 drives the reciprocating screw rod 11 to rotate. Under the guiding action of the guiding rod 12, the reciprocating screw rod 11 drives the moving seat 2 to reciprocate on the cleaning platform 1 through the slider 20. While the moving seat 2 is moving, under the action of the rack 9, the circular gear 6 rotates. The circular gear 6 drives the first bevel gear 7 to rotate through the shaft. The first bevel gear 7 drives the second bevel gear 8 to rotate. The second bevel gear 8 drives the disc 4 to rotate. The disc 4 thus drives the cleaning unit 3 to reciprocate on the moving seat 2 through the connecting rod 5. The reciprocating cleaning unit 3 simulates the way of manual reciprocating wiping and carefully wipes and cleans the forming surface of the acrylic plate, so as to ensure that the particulate impurities are completely separated from the forming surface of the acrylic plate.

[0057] In summary, the cavity of the forming die is pre-cleaned without dust to ensure the cleanliness of the cavity and avoid defects on the surface of the massage cylinder caused by particulate protrusions. At the same time, before the acrylic plate is transported to the cavity opening, the cleaning mechanism is used to clean the forming surface of the acrylic plate, reducing the particulate impurities adhered to the forming surface of the acrylic plate, which is beneficial to improving the forming quality of the spa water massage cylinder.

[0058] The above are all the preferred embodiments of this application. The protection scope of this application is not limited hereby. Therefore, all equivalent changes made according to the structure, shape and principle of this application shall be covered within the protection scope of this application.

Claims

1. A molding method for a spa hot tub, characterized in that, It includes the following steps: S1: Prepare the backup board, prepare the acrylic board to be processed, and stack it on the loading platform; S2: Clean the mold cavity, prepare the forming molds of the massage cylinder for at least two workstations, and clean the mold cavities of the forming molds dust-free respectively; S3: Clean the board and load it. Use the robotic arm to transport the acrylic board to the cleaning platform (1), clean the forming surface of the acrylic board through the cleaning structure on the cleaning platform (1), and then transport and fix the acrylic board to the cavity opening of the forming mold; S4: Heat the board. Move the electric radiant panel above the acrylic board, and use the electric radiant panel to heat the board in a region to soften the acrylic board; S5: Negative pressure forming. Make the mold cavity of the forming mold form a vacuum negative pressure area, and the softened acrylic board is sucked and adhered to the inner wall of the mold cavity to form a prototype of the massage cylinder; S6: Cooling. Use a hair dryer to cool down the massage cylinder; S7: Unload. Use the robotic arm to separate the massage cylinder from the forming mold and transport the massage cylinder to the inspection table; S8: Quality inspection. Suspend the massage cylinder and tilt it at an angle to observe the surface forming quality of the massage cylinder.

2. The forming method of a spa hot tub according to claim 1, characterized in that, In the step S2, the following steps are further included: S2.1: Use a negative pressure dust suction device to perform three-dimensional scanning adsorption treatment on the surface of the mold cavity. The negative pressure dust suction device is equipped with an adjustable suction nozzle, and the end of the suction nozzle is connected to a nano-level filter screen. The adsorption pressure is controlled between -0.06 MPa and -0.1 MPa; S2.2: Use an electrostatic elimination type dust-free cloth in cooperation with a volatile organic solvent cleaner to perform a one-way wiping operation along the curved surface of the mold cavity, and the wiping pressure is maintained at 0.15 - 0.3 N / cm²; S2.3: Use a temperature-controlled compressed gas purging system to perform 360° circumferential purging on the mold cavity. The compressed gas is nitrogen that has been dried by molecular sieve, the purging pressure is 0.4 - 0.6 MPa, and the gas temperature is maintained at 40 - 50 °C; S2.4: Uniformly coat a photocurable anti-fouling coating on the surface of the mold cavity, and the coating thickness is 5 - 8 μm. The anti-fouling coating contains nano-titanium dioxide components; S2.5: Use a UV irradiation device (501) with a wavelength of 365 nm to perform three-dimensional irradiation treatment on the mold cavity, and the irradiation intensity reaches 1200 - 1500 μW / cm², and the duration is 8 - 12 minutes.

3. The molding method of a spa hot tub according to claim 2, wherein In the step S2.2, the electrostatic elimination type dust-free cloth adopts a mixed structure of ultra-fine polyester fiber and stainless steel wire, and the diameter of the metal wire is 0.02 - 0.05 mm, which is spirally embedded in the fiber layer.

4. A forming method of a spa hot tub according to claim 2, characterized in that In the step S2.3, the compressed gas purging system includes a multi-stage pressure regulating module, and the module is configured with a piezoelectric ceramic micro-valve, which can control the pressure fluctuation range within ±0.02 MPa.

5. A forming method of a spa hydrotherapy bathtub according to claim 2, characterized in that, In the step S2.4, the photocurable anti-fouling coating forms a micro-nano composite structure surface after curing, with a static water contact angle ≥ 150° and a surface energy ≤ 18 mN / m.

6. The forming method of a spa hot tub according to claim 1, characterized in that, The cleaning structure includes a cleaning unit (3). A moving seat (2) is movably arranged on the top surface of the cleaning platform (1). The cleaning unit (3) is movably arranged on the top surface of the moving seat (2). The moving seat (2) is provided with a reciprocating mechanism for driving the cleaning unit (3) to reciprocate.

7. A forming method of a spa hydrotherapy bathtub according to claim 6, characterized in that, The reciprocating mechanism includes a disc (4) and a connecting rod (5). The disc (4) is rotatably arranged above the moving seat (2). The connecting rod (5) is arranged between the disc (4) and the cleaning unit (3). One end of the connecting rod (5) is eccentric and hinged to the disc (4), and the other end of the connecting rod (5) is hinged to the cleaning unit (3). The moving seat (2) is provided with a transmission component for driving the disc (4) to rotate.

8. A molding method of a spa bathtub according to claim 7, characterized in that, The transmission component includes a circular gear (6), a first bevel gear (7) and a second bevel gear (8). A rack (9) is arranged on the top surface of the cleaning platform (1). The circular gear (6) is rotatably arranged on the bottom surface of the moving seat (2). The circular gear (6) meshes with the rack (9). The first bevel gear (7) is coaxially connected to the circular gear (6). The second bevel gear (8) is coaxially connected to the disc (4). The first bevel gear (7) meshes with the second bevel gear (8).

9. A molding method of a spa hot tub according to claim 6, characterized in that, The cleaning unit (3) includes a fixed cylinder (15) and a cleaning handle (16). The cleaning handle (16) is slidably connected to the fixed cylinder (15). A cleaning cloth (17) is arranged at the top end of the cleaning handle (16). A spring (18) is arranged in the fixed cylinder (15). One end of the spring (18) is connected to the inner bottom wall of the fixed cylinder (15), and the other end of the spring (18) is connected to the bottom end of the cleaning handle (16).

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