A fully enclosed rotational molding machine and method for molding and processing polymer materials

Abstract

The present invention discloses a fully enclosed roto-molding machine and method for polymer material molding, which relates to the technical field of roto-molding machines, including a transmission mechanism, a rotating rod is arranged inside the transmission mechanism, a driving mechanism is arranged at one end of the rotating rod, a heat collecting mechanism for focusing heat energy is arranged at both upper and lower ends of the driving mechanism, a mold shell is arranged inside the heat collecting mechanism, and a pressurizing mechanism extending to the inside of the mold shell and increasing the internal air pressure is arranged on the outer surface of the heat collecting mechanism. The high-pressure gas discharged by the pressurizing mechanism provided in the present invention can effectively reduce bubbles in the plastic solution, improve the density and surface quality of the product, and the reduction of bubbles means that the structure of the product is more uniform, reducing potential defects, and the high-pressure gas can evenly squeeze the plastic solution onto the inner wall of the mold shell, especially in some corners and parts with complex shapes, ensuring that the shape of the product is clear and without defects.

Description

Technical Field

[0001] The invention relates to the technical field of roto-molding machines, and in particular to a fully enclosed roto-molding machine and method for polymer material molding. Background Art

[0002] For example, the invention patent with the publication number CN115026983B, the invention name is a roto-molding machine, including an oven and a rotating frame for fixing the mold, the rotating frame includes an outer frame and an inner frame rotatably connected to the outer frame, the outer frame is erected on the ground through a first bracket, and the inner frame is used to fix the mold; the outer wall of the outer frame is fixed with a first rotating shaft, the outer frame is rotatably connected to the first bracket through the first rotating shaft; the outer wall of the inner frame is fixedly connected with a second rotating shaft, the inner frame is rotatably connected to the outer frame through the second rotating shaft, and the central axis of the first rotating shaft is vertically arranged with the central axis of the second rotating shaft; the first bracket is connected with a first driving component for driving the first rotating shaft to rotate, and a synchronization component for driving the first rotating shaft and the second rotating shaft to rotate synchronously is arranged between the first rotating shaft and the second rotating shaft. A roto-molding machine in this application can improve the coating uniformity of plastic raw materials in the mold cavity and improve the quality of roto-molding.

[0003] Roto-molding machines are mainly used to produce products with irregular surfaces. The molten plastic is kept close to the mold cavity by rotation. However, bubbles are easily generated inside the plastic during melting. In addition, the speed of rotating the mold is different from the temperature rise of the plastic, which results in the plastic solution not being evenly squeezed onto the inner wall of the mold shell, especially at corners and complex shapes. It is also easy to cause the surface of the product to be rough and uneven, and the plastic product may be too thin or too thick in some areas. Summary of the invention

[0004] The purpose of the present application is to provide a fully enclosed rotational molding machine and method for polymer material molding processing, which can effectively solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a fully enclosed rotational molding machine for polymer material molding processing, comprising a transmission mechanism, a rotating rod is arranged inside the transmission mechanism, one end of the rotating rod is arranged with a driving mechanism, both upper and lower ends of the driving mechanism are arranged with heat collecting mechanisms for focusing thermal energy, a mold shell is arranged inside the heat collecting mechanism, a pressurizing mechanism extending into the mold shell and increasing the internal air pressure thereof is arranged on the outer surface of the heat collecting mechanism, and a supporting mechanism for supporting the mold shell and performing defoaming treatment is arranged inside the heat collecting mechanism;

[0006] The heat collection mechanism comprises a mounting frame, which is fixedly mounted on the rotating shaft of the driving mechanism, and the inner wall of the mounting frame is provided with a plurality of radiant heat ring plates with decreasing diameters for reflecting heat energy;

[0007] The pressurizing mechanism includes two air boxes, both of which are fixedly mounted on the outer surface of the mounting frame, a ventilation valve being provided at the upper end of the two air boxes, a connecting pipe being provided at the lower part of the outer surface of the two air boxes, a ventilation pipe being connected between the two connecting pipes, an air pipe being provided inside the ventilation pipe, and one end of the air pipe passing through the ventilation pipe and extending to the outside thereof.

[0008] Preferably, a mounting bracket is provided on the inner wall of the mounting frame, the mold shell is fixedly mounted on the upper end of the mounting bracket, and a mounting hole is opened in the middle of the upper end of the mounting bracket.

[0009] Preferably, the vent pipe is installed inside the mounting hole, a mounting ring block is provided on the outer surface of the vent pipe, and the mounting ring block is located at the upper part of the mounting frame, a bimetallic spring is provided on the outer surface of the mounting ring block, a demolding rib is provided on the bottom of the inner wall of the mold shell, and the mold shell is clamped on the bottom of the outer surface of the mounting ring block.

[0010] Preferably, an anti-blocking head is provided on the upper part of the outer surface of the vent pipe, and a plurality of exhaust holes distributed at equal intervals are opened on the outer surface of the anti-blocking head. A sealing tube is sleeved on the outer surface of the anti-blocking head, and the sealing tube covers the exhaust holes.

[0011] Preferably, a through-hole pipe head is provided at the upper end of the air pipe, and a spiral blade is provided on the upper portion of the outer surface of the air pipe. The through-hole pipe head and the spiral blade are both located inside the anti-blocking head to guide the airflow to be discharged through the exhaust hole.

[0012] Preferably, the anti-blocking head is located in the middle of the inner cavity of the mold shell, and one end of the ventilation pipe and the air pipe are both provided with a valve body.

[0013] Preferably, the supporting mechanism comprises a plurality of mounting blocks distributed in a circular array, a plurality of the mounting blocks are provided with a supporting rod at the bottom, and the supporting rod is fixedly mounted on the upper end of the mounting frame, a plurality of the mounting blocks are provided with a mounting cylinder rotatably mounted inside, a plurality of the mounting cylinders are provided with a supporting top block at one end, and a plurality of the mounting cylinders are provided with a hammer ball inside.

[0014] Preferably, a groove is formed inside each of the plurality of supporting top blocks, and a hoop is provided inside the groove, and each of the plurality of supporting top blocks abuts against the outer surface of the mold shell.

[0015] A method based on a fully enclosed rotational molding machine for polymer material molding processing, the method of using the fully enclosed rotational molding machine is as follows:

[0016] S1. Pour plastic particles into a mold shell composed of two half molds, then install the mold shell inside the heat collection mechanism, push the mold shell into the heating chamber by moving the transmission mechanism, and then the transmission mechanism drives the rotating rod to rotate, and the driving mechanism drives the heat collection mechanism to rotate, so that the mold shell installed inside the heat collection mechanism can rotate 360 ​​degrees in all directions in the heating chamber;

[0017] S2. When the plastic particles inside the mold shell melt, the pressurizing mechanism will increase the pressure inside the mold shell, so that the atmospheric pressure inside the mold shell is higher than the atmospheric pressure outside;

[0018] S3. When the heat collecting mechanism rotates, the supporting mechanism applies force to knock the surface of the mold shell, so that the molten plastic solution can be closely attached to the gap of the mold and less bubbles are generated.

[0019] The present invention includes at least one of the following beneficial technical effects:

[0020] 1. The high-pressure gas discharged by the pressurizing mechanism provided in the present invention can effectively reduce the bubbles in the plastic solution, improve the density and surface quality of the product. The reduction of bubbles means that the structure of the product is more uniform, reducing potential defects, and the high-pressure gas can evenly squeeze the plastic solution onto the inner wall of the mold shell, especially at some corners and parts with complex shapes, ensuring that the shape of the product is clear and without defects; the high-pressure gas discharged by the pressurizing mechanism can tightly fit the plastic solution on the inner wall of the mold shell, making the surface of the product smoother, reducing the roughness and unevenness of the surface, and can also squeeze the plastic solution into every detail of the mold shell, ensuring the details of the product It is clearly visible that the extrusion effect of the high-pressure gas makes the plastic solution form a denser structure on the inner wall of the mold shell, which enhances the mechanical properties of the product, improves the impact resistance and pressure resistance of the product, and can reduce internal defects caused by bubbles and uneven distribution, thereby improving the overall strength and durability of the product. The high-pressure gas inside the mold shell can squeeze the plastic solution into every corner of the mold shell, especially for products with irregular shapes and complex structures, ensuring the consistency of the shape and size of the product. The high-pressure gas inside the mold shell can ensure the uniform distribution of the plastic solution on the inner wall of the mold shell, making the wall thickness of the product more uniform and avoiding the problem of local excessive thinness or thickness.

[0021] 2. The hemispherical stacked radiant heat ring plates of the present invention can radiate heat to the mold shell in a concentrated manner, so that the plastic inside the mold shell quickly reaches the melting temperature, shortening the heating time. The design of the radiant heat ring plates ensures uniform distribution of heat, avoids local overheating or uneven heating, and makes the plastic particles melt evenly in the entire mold shell. The uniform heating process reduces the thermal stress caused by local overheating of the plastic inside the mold shell, improves the structural stability of the product, and rapid and uniform heating helps to reduce bubbles generated during the melting process of the plastic and improve the surface quality and internal density of the product.

[0022] 3. In the present invention, cold air is blown into the mold shell through the air pipe to directly cool the plastic solution inside the mold shell, thereby accelerating the solidification process of the plastic solution. The external cooling device cooperates with the internal cooling to further accelerate the overall cooling speed of the mold shell and shorten the cooling time. Moreover, blowing cold air into the mold shell ensures uniform cooling of the plastic solution inside the mold shell, thereby avoiding deformation and stress concentration caused by uneven cooling. Rapid cooling reduces the formation of bubbles in the plastic solution, thereby improving the surface quality and internal density of the product. Uniform cooling ensures that the product has a clear shape, particularly for products with irregular shapes, thereby reducing shape distortion caused by uneven cooling. The cooled plastic product shrinks, thereby making it easier to remove the product from the mold shell, thereby reducing the difficulty and time of demolding. Rapid cooling and uniform shrinkage reduce damage to the product during demolding, thereby improving the integrity and qualified rate of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of a fully enclosed rotational molding machine from the first perspective;

[0025] Figure 2 It is a schematic diagram of the three-dimensional structure of a fully enclosed rotational molding machine from a second perspective;

[0026] Figure 3 It is a schematic diagram of the three-dimensional structure of a fully enclosed rotational molding machine from a third perspective;

[0027] Figure 4 It is a schematic diagram of the partial three-dimensional connection structure of a fully enclosed rotational molding machine;

[0028] Figure 5 A schematic diagram of a three-dimensional connection structure of a heat collection mechanism, a pressurizing mechanism and a supporting mechanism from a first-person perspective;

[0029] Figure 6 A second perspective schematic diagram of a three-dimensional connection structure of the heat collecting mechanism, the pressurizing mechanism and the supporting mechanism;

[0030] Figure 7 It is a schematic diagram of the three-dimensional connection structure of the heat collection mechanism;

[0031] Figure 8 It is a schematic diagram of the three-dimensional connection structure of the radiant heat ring plate and the mounting frame;

[0032] Fig. 9 It is a schematic diagram of the three-dimensional connection structure of the heat collection mechanism and the pressurizing mechanism;

[0033] Fig.10 It is a schematic diagram of the three-dimensional connection structure of the pressurizing mechanism;

[0034] Fig.11 It is a schematic diagram of the three-dimensional connection structure of the mold shell and the bimetallic reed;

[0035] Fig.12 A sectional view of the three-dimensional connection structure of the pressurizing mechanism from a first perspective;

[0036] Fig.13 A schematic diagram of a three-dimensional connection structure of a pressurizing mechanism from a second viewing angle;

[0037] Fig.14 It is a schematic diagram of the three-dimensional connection structure of the spiral blade and the through-hole pipe head;

[0038] Fig.15 It is a schematic diagram of the three-dimensional connection structure of the anti-blocking head and the spiral blade;

[0039] Fig.16 It is a schematic diagram of the three-dimensional connection structure of the supporting mechanism;

[0040] Fig.17 It is a partial cross-sectional view of the three-dimensional connection structure of the support mechanism.

[0041] In the figure: 1. transmission mechanism; 2. rotating rod; 3. driving mechanism; 4. heat collecting mechanism; 41. mounting frame; 42. radiant heat ring plate; 43. mounting frame; 44. mounting hole; 5. pressurizing mechanism; 51. air box; 52. vent valve; 53. connecting pipe; 54. air pipe; 55. vent pipe; 56. bimetallic reed; 57. mounting ring block; 58. blocking pipe; 59. anti-blocking head; 511. spiral blade; 512. through-hole pipe head; 513. exhaust hole; 6. mold shell; 7. supporting mechanism; 71. supporting rod; 72. mounting block; 73. hoop; 74. supporting top block; 75. mounting cylinder; 76. hammer ball; 9. demoulding rib. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Example 1, Reference Figures 1 to 17 A fully enclosed rotational molding machine for polymer material molding processing shown in the figure comprises a transmission mechanism 1, a rotating rod 2 is arranged inside the transmission mechanism 1, a driving mechanism 3 is arranged at one end of the rotating rod 2, a heat collecting mechanism 4 for focusing heat energy is arranged at both upper and lower ends of the driving mechanism 3, a mold shell 6 is arranged inside the heat collecting mechanism 4, a pressurizing mechanism 5 extending into the mold shell 6 and increasing the internal air pressure thereof is arranged on the outer surface of the heat collecting mechanism 4, and a supporting mechanism 7 for supporting the mold shell 6 and performing defoaming treatment is arranged inside the heat collecting mechanism 4;

[0044] It is worth noting that the plastic particles are poured into the mold shell 6 which is spliced ​​by two half molds, and then the mold shell 6 is installed inside the heat collection mechanism 4, and the mold shell 6 is pushed into the heating chamber by the movement of the transmission mechanism 1, and then the transmission mechanism 1 drives the rotating rod 2 to rotate, and the driving mechanism 3 drives the heat collection mechanism 4 to rotate, so that the mold shell 6 installed inside the heat collection mechanism 4 can rotate 360 ​​degrees in the heating chamber, and the heat collection mechanism 4 is designed in the shape of a hemispherical shell. When the temperature in the heating chamber rises, the heat collection mechanism 4 can radiate heat energy so that the heat accumulates on the mold shell 6, and the mold shell 6 is located in the middle of the heat collection mechanism 4, which can make full use of the heat to accelerate the heating of the mold shell 6;

[0045] When the plastic particles inside the mold shell 6 melt, the heat collecting mechanism 4 will also turn over with the rotation of the rotating rod 2 and the driving mechanism 3. The melted plastic particles are sticky and will be adsorbed on the inner wall of the mold shell 6. When the plastic particles inside the mold shell 6 gradually melt, the pressurizing mechanism 5 will fill the inside of the mold shell 6 with gas. After the gas is pressurized by thermal collision, the atmospheric pressure inside the mold shell 6 is higher than the atmospheric pressure outside, and the plastic solution inside the mold shell 6 will be squeezed by the pressurized gas, so that the plastic solution can be tightly attached to the inner wall of the mold shell 6, and the plastic solution can be squeezed into some corners, ensuring that the irregular shapes produced are clear and no bubbles are generated;

[0046] The high-pressure gas discharged by the pressurizing mechanism 5 can effectively reduce the bubbles in the plastic solution and improve the density and surface quality of the product. The reduction of bubbles means that the structure of the product is more uniform, reducing potential defects. In addition, the high-pressure gas can evenly squeeze the plastic solution onto the inner wall of the mold shell, especially at some corners and parts with complex shapes, ensuring that the shape of the product is clear and without defects.

[0047] The pressurizing mechanism 5 discharges high-pressure gas to fit the plastic solution tightly onto the inner wall of the mold shell 6, making the surface of the product smoother and reducing the roughness and unevenness of the surface. The plastic solution can also be squeezed into every detail of the mold shell 6 to ensure that the details of the product are clearly visible. The squeezing effect of the high-pressure gas enables the plastic solution to form a denser structure on the inner wall of the mold shell 6, thereby enhancing the mechanical properties of the product, improving the impact resistance and pressure resistance of the product, and reducing internal defects caused by bubbles and uneven distribution, thereby improving the overall strength and durability of the product.

[0048] The high-pressure gas inside the mold shell 6 can squeeze the plastic solution into every corner of the mold shell, especially for products with irregular shapes and complex structures, ensuring the consistency of the shape and size of the products. The high-pressure gas inside the mold shell 6 can ensure the uniform distribution of the plastic solution on the inner wall of the mold shell 6, making the wall thickness of the product more uniform and avoiding the problem of local excessive thinness or thickness.

[0049] When the heat collecting mechanism 4 rotates, the supporting mechanism 7 exerts force to knock the surface of the mold shell 6, so that the molten plastic solution can be closely attached to the gap of the mold and less bubbles are generated.

[0050] Embodiment 2: Based on the heat collection mechanism 4 and the pressurizing mechanism 5 described in Embodiment 1, this embodiment provides a further technical solution for the heat collection mechanism 4 and the pressurizing mechanism 5.

[0051] The heat collecting mechanism 4 comprises a mounting frame 41 , which is fixedly mounted on the rotating shaft of the driving mechanism 3 , and the inner wall of the mounting frame 41 is provided with a plurality of heat radiating ring plates 42 with decreasing diameters for reflecting heat energy.

[0052] The inner wall of the mounting frame 41 is provided with a mounting frame 43, the mold shell 6 is fixedly mounted on the upper end of the mounting frame 43, and a mounting hole 44 is opened in the middle of the upper end of the mounting frame 43.

[0053] It is worth mentioning that when in use, the mold shell 6 is fixedly installed on the upper end of the mounting frame 43, and the mold shell 6 is sent into the heating chamber. After the mold shell 6 is heated, the plastic inside begins to melt, and the radiant heat ring plate 42 is stacked in a hemispherical shape to radiate the heat in the heating chamber onto the mold shell 6, so that the plastic inside the mold shell 6 melts quickly.

[0054] Among them, the hemispherical stacked radiant heat ring plates 42 can concentrate and radiate heat to the mold shell 6, better utilize the radiant heat energy in the heating chamber, and the hemispherical stacked radiant heat ring plates 42 design can better utilize the reflection and scattering effects, so that the heat is more evenly distributed in various parts of the mold shell 6, so that the plastic inside the mold shell can quickly reach the melting temperature, shortening the heating time, and the design of the radiant heat ring plates 42 ensures the uniform distribution of heat, avoids the problem of local overheating or uneven heating, and makes the plastic particles melt evenly in the entire mold shell. The uniform heating process reduces the thermal stress caused by local overheating of the plastic inside the mold shell 6, improves the structural stability of the product, and the rapid and uniform heating helps to reduce bubbles generated during the melting process of the plastic and improve the surface quality and internal density of the product.

[0055] The pressurizing mechanism 5 includes two air boxes 51, and the two air boxes 51 are fixedly mounted on the outer surface of the mounting frame 41. A ventilation valve 52 is provided at the upper end of the two air boxes 51, and a connecting pipe 53 is provided at the lower part of the outer surface of the two air boxes 51. A ventilation pipe 55 is connected between the two connecting pipes 53, and an air pipe 54 is provided inside the ventilation pipe 55, and one end of the air pipe 54 passes through the ventilation pipe 55 and extends to the outside thereof.

[0056] An anti-blocking head 59 is provided on the upper part of the outer surface of the vent pipe 55 . A plurality of exhaust holes 513 distributed at equal intervals are opened on the outer surface of the anti-blocking head 59 . A sealing tube 58 is sleeved on the outer surface of the anti-blocking head 59 , and the sealing tube 58 covers the exhaust holes 513 .

[0057] It is worth mentioning that when the plastic particles inside the mold shell 6 melt, the sealing tube 58 mounted on the surface of the anti-blocking head 59 will also begin to melt. When the sealing tube 58 slowly melts to expose the exhaust hole 513, the high-pressure gas inside the air box 51 will enter the vent pipe 55 through the connecting pipe 53, and then be discharged through the airflow guidance of the spiral blade 511. After the gas enters the interior of the anti-blocking head 59, it is discharged into the interior of the mold shell 6 through the exhaust hole 513. The spiral blades 511 and the exhaust hole 513 prevent the melted sealing tube 58 from flowing into the air pipe 54. The spiral blades 511 guide the airflow to prevent the plastic solution from blocking the exhaust hole 513.

[0058] A valve body is provided at one end of the air pipe 54. At this time, the air pipe 54 is closed by the valve body and is in a non-ventilated state. Before installing the mold shell 6, it is necessary to fill the interior of the air box 51 with high-pressure gas through the vent valve 52. During the process of filling the interior of the air box 51 with gas, the valve body at one end of the vent pipe 55 is in a closed state. When the air pressure value inside the air box 51 reaches a specified value, the blocking pipe 58 is installed on the anti-blocking head 59, and then the valve body at one end of the vent pipe 55 is opened.

[0059] The sealing tube 58 is made of plastic. When the plastic particles melt in the sealing tube 58, the gas inside the air box 51 is discharged into the interior of the mold shell 6 through the exhaust hole 513. The gas in the mold shell 6 will also expand in the rising chamber, so that the air pressure inside the mold shell 6 gradually increases. The increased extrusion inside the mold shell 6 will extrude the plastic solution tightly against the inner wall of the mold shell 6, so that irregularly shaped hollow plastic products can be produced clearly without bubble defects.

[0060] Among them, the plugging tube 58 is made of plastic material. As the plastic particles inside the mold shell 6 melt, the plugging tube 58 will gradually melt, and finally the exhaust hole 513 is exposed, ensuring that the gas enters the mold shell 6 only after the plastic particles melt, avoiding bubbles and uneven distribution caused by premature entry. The design of the anti-blocking head 59 prevents the melted plugging tube 58 from flowing into the air pipe 54, ensuring that the air path is unobstructed. After the high-pressure gas enters the mold shell 6, it is discharged through the exhaust hole 513, so that the air pressure inside the mold shell 6 increases, thereby squeezing the plastic solution close to the inner wall of the mold shell 6, reducing the generation of bubbles, and improving the density and surface quality of the product;

[0061] The squeezing effect of the high-pressure gas ensures that the plastic solution is evenly distributed on the inner wall of the mold shell 6, especially for products with irregular shapes, ensuring that the shape of the product is clear and without defects. The high-pressure gas fits the plastic solution tightly to the inner wall of the mold shell, making the surface of the product smoother and reducing the roughness and unevenness of the surface. The high-pressure gas can squeeze the plastic solution into every detail of the mold shell 6, ensuring that the details of the product are clearly visible, thereby improving the appearance quality of the product.

[0062] In addition, the extrusion effect of the high-pressure gas causes the plastic solution to form a more compact structure on the inner wall of the mold shell 6, thereby enhancing the mechanical properties of the product, improving the impact resistance and pressure resistance of the product, reducing internal defects caused by bubbles and uneven distribution, and improving the overall strength and durability of the product.

[0063] The plastic solution can be squeezed into every corner of the mold shell 6 by high-pressure gas, especially for products with irregular shapes and complex structures, ensuring the consistency of the shape and size of the products. The high-pressure gas can ensure the uniform distribution of the plastic solution on the inner wall of the mold shell 6, making the wall thickness of the product more uniform and avoiding the problem of local excessive thinness or thickness.

[0064] A through hole pipe head 512 is provided at the upper end of the air pipe 54, and a spiral blade 511 is provided on the upper outer surface of the air pipe 54. The through hole pipe head 512 and the spiral blade 511 are both located inside the anti-blocking head 59 to guide the airflow to be discharged through the exhaust hole 513. The setting of the through hole pipe head 512 and the spiral blade 511 can guide the airflow to slowly enter the interior of the mold shell 6. The anti-blocking head 59 is located in the middle of the inner cavity of the mold shell 6, which can ensure that the melted plastic will not be adsorbed on the anti-blocking head 59.

[0065] Among them, when the mold shell 6 is moved out of the heating chamber for cooling and demoulding, the valve bodies at one end of the air pipe 54 and the vent pipe 55 are opened, and the vent valve 52 is opened, and the high-temperature gas inside the mold shell 6 will enter the interior of the air box 51 through the vent pipe 55 and the connecting pipe 53, and the high-temperature gas entering the interior of the air box 51 will be discharged through the vent valve 52, and part of the gas will be discharged through the air pipe 54. When the internal air pressure of the mold shell 6 is connected to the external air pressure, the air pipe is connected to one end of the air pipe 54, and cold air is blown into the interior of the air pipe 54 through the air compressor. Cold air is blown into the interior of the mold shell 6 through the air pipe 54 to cool the interior of the mold shell 6, and the high-temperature gas inside the mold shell 6 will also be discharged through the vent pipe 55 and the connecting pipe 53. The cooperation between the vent pipe 55 and the air pipe 54 allows the gas inside the mold shell 6 to be quickly exchanged for cooling;

[0066] Blowing cold air into the mold shell 6 through the air pipe 54 can accelerate the cooling inside the mold shell 6. After the mold shell 6 is moved to the storage room, an external cooling device will also cool it. The demoulding cooling time is reduced by combining internal circulation cooling with external cooling, and the plastic product shrinks after cooling, making it easier to demould.

[0067] Among them, cold air is blown into the mold shell 6 through the air pipe 54 to directly cool the plastic solution inside the mold shell, thereby accelerating the solidification process of the plastic solution. The external cooling device cooperates with the internal cooling to further accelerate the overall cooling speed of the mold shell 6 and shorten the cooling time.

[0068] Moreover, blowing cold air into the mold shell 6 ensures uniform cooling of the plastic solution inside the mold shell 6, avoiding deformation and stress concentration caused by uneven cooling. Rapid cooling reduces bubble formation in the plastic solution, improves the surface quality and internal density of the product, and uniform cooling ensures a clear shape of the product, especially for irregularly shaped products, reducing shape distortion caused by uneven cooling.

[0069] The cooled plastic product will shrink, making it easier to remove the product from the mold shell 6, reducing the demoulding difficulty and time. Rapid cooling and uniform shrinkage reduce damage to the product during the demoulding process, improving the integrity and pass rate of the product.

[0070] The vent pipe 55 is installed inside the mounting hole 44, and a mounting ring block 57 is provided on the outer surface of the vent pipe 55, and the mounting ring block 57 is located on the upper part of the mounting frame 43. A bimetallic spring 56 is provided on the outer surface of the mounting ring block 57, and a demoulding rib 9 is provided on the bottom of the inner wall of the mold shell 6, and the mold shell 6 is clamped on the bottom of the outer surface of the mounting ring block 57.

[0071] It is worth noting that when the temperature inside the mold shell 6 rises, the bimetallic spring 56 also extends due to the increase in temperature, and the anti-blocking head 59 is designed in the shape of a coil spring. When the plastic particles melt, they will cling to the inner wall of the mold shell 6. In order to prevent more plastic solution from being adsorbed on the surface of the mounting ring block 57, the bimetallic spring 56 will extend to push away the plastic particle solution, and the demoulding rib 9 is set to limit the extension range of the bimetallic spring 56. The extension of the bimetallic spring 56 can ensure that less plastic solution is adsorbed on the surface of the mounting ring block 57, and some of the solution will enter the gap between the bimetallic springs 56;

[0072] When the mold shell 6 is cooled, the bimetallic spring 56 will also shrink due to the decrease in temperature, making it easier for the plastic to be demolded from the bimetallic spring 56 and the mounting ring block 57. Since the plastic solution is also a slow cooling and molding process, the mounting ring block 57 shrinks and cools during the cooling of the plastic solution to ensure that there is a smaller contact area between the mounting ring block 57 and the molded plastic, thereby facilitating the demolding of the plastic product. Even if plastic is mixed in the internal gap of the bimetallic spring 56, it will not affect the next use.

[0073] Among them, when the temperature inside the mold shell 6 rises, the bimetallic spring 56 expands due to the temperature increase, pushing away the plastic particle solution, reducing the possibility of the plastic solution being adsorbed on the surface of the mounting ring block 57. The demolding rib 9 limits the extension range of the bimetallic spring 56, ensuring that the bimetallic spring 56 can quickly return to its original state after cooling.

[0074] Embodiment 3: Based on the support mechanism 7 described in Embodiment 1, this embodiment provides a further technical solution for the support mechanism 7.

[0075] The supporting mechanism 7 includes a plurality of mounting blocks 72 distributed in a circular array, a support rod 71 is provided at the bottom of each of the mounting blocks 72, and the support rod 71 is fixedly installed on the upper end of the mounting frame 43, a mounting cylinder 75 is rotatably installed inside each of the mounting blocks 72, a supporting top block 74 is provided at one end of each of the mounting cylinders 75, and a hammer ball 76 is provided inside each of the mounting cylinders 75.

[0076] A groove is formed inside each of the supporting top blocks 74 , and a hoop 73 is disposed inside the groove. The supporting top blocks 74 abut against the outer surface of the mold shell 6 .

[0077] It is worth noting that, after the mold shell 6 is installed on the heat collecting mechanism 4, the installation cylinder 75 inside the installation block 72 is rotated so that the support top block 74 abuts against the surface of the mold shell 6, and then the hoop 73 is installed on the support top block 74 for fixing. When the heat collecting mechanism 4 rotates, the hammer ball 76 inside the installation cylinder 75 will also roll inside the installation cylinder 75. When the hammer ball 76 rolls back and forth inside the installation cylinder 75 and hits the support top block 74 and the installation cylinder 75 as the heat collecting mechanism 4 rotates, the force generated by the impact of the hammer ball 76 is transmitted to the mold shell 6;

[0078] When the plastic solution inside the mold shell 6 flows along the inner wall of the mold shell 6 , the plastic solution can be knocked into the gap of the mold shape through vibration.

[0079] Among them, the vibration of the mold shell 6 makes the internal plastic solution more evenly distributed on the inner wall of the mold shell 6, especially for products with irregular shapes and complex structures, ensuring that the plastic solution can enter every detail, and the vibration makes the plastic solution fit more closely on the inner wall of the mold shell, reducing the roughness and unevenness of the surface, and improving the surface finish of the product; the vibration helps the plastic solution to enter every detail of the mold shell 6, ensuring that the details of the product are clearly visible, and improving the appearance quality of the product; the vibration makes the plastic solution form a denser structure on the inner wall of the mold shell 6, enhancing the mechanical properties of the product, and improving the impact resistance and pressure resistance of the product. The vibration helps to reduce internal defects caused by bubbles and uneven distribution, and improves the overall strength and durability of the product.

[0080] The present invention also provides a method based on a fully enclosed rotational molding machine for polymer material molding processing. The method of using the fully enclosed rotational molding machine is as follows:

[0081] S1. Pour plastic particles into the mold shell 6 which is spliced ​​by two half molds, and then install the mold shell 6 inside the heat collection mechanism 4. The mold shell 6 is pushed into the heating chamber by the movement of the transmission mechanism 1. Then the transmission mechanism 1 drives the rotating rod 2 to rotate, and the driving mechanism 3 drives the heat collection mechanism 4 to rotate, so that the mold shell 6 installed inside the heat collection mechanism 4 can rotate 360 ​​degrees in all directions in the heating chamber. The heat collection mechanism 4 is designed in the shape of a hemispherical shell. When the temperature in the heating chamber rises, the heat collection mechanism 4 can radiate heat energy so that the heat accumulates on the mold shell 6. The mold shell 6 is located in the middle of the heat collection mechanism 4, which can make full use of the heat to accelerate the heating of the mold shell 6.

[0082] The heat collecting mechanism 4 is designed in the shape of a hemispherical shell, so that the heat can be radiated to the mold shell 6 more concentratedly, ensuring that the plastic particles inside the mold shell 6 can be evenly heated and melted. Through the coordinated action of the transmission mechanism 1 and the driving mechanism 3, the mold shell 6 can rotate 360 ​​degrees in all directions in the heating chamber, further ensuring the uniform distribution of the plastic particles on the inner wall of the mold shell 6.

[0083] S2. When the plastic particles inside the mold shell 6 melt, the heat collecting mechanism 4 will also turn over with the rotation of the rotating rod 2 and the driving mechanism 3. The melted plastic particles are sticky and will be adsorbed on the inner wall of the mold shell 6. When the plastic particles inside the mold shell 6 gradually melt, the pressurizing mechanism 5 will fill the inside of the mold shell 6 with gas. After the gas is pressurized by thermal collision, the atmospheric pressure inside the mold shell 6 is higher than the atmospheric pressure outside, and the plastic solution inside the mold shell 6 will be squeezed by the pressurized gas, so that the plastic solution can be tightly attached to the inner wall of the mold shell 6, and the plastic solution can be squeezed into some corners, ensuring that the irregular shapes produced are clear and no bubbles are generated;

[0084] The pressurizing mechanism 5 fills gas into the mold shell 6, so that the atmospheric pressure inside the mold shell is higher than that outside. The plastic solution is squeezed tightly against the inner wall of the mold shell under high pressure, reducing the generation of bubbles. The high-pressure gas of the pressurizing mechanism 5 can squeeze the plastic solution into every detail of the mold shell, ensuring the clarity and integrity of the irregular shape.

[0085] S3, when the heat collecting mechanism 4 rotates, the supporting mechanism 7 applies force to knock the surface of the mold shell 6, so that the melted plastic solution can be closely attached to the gap of the mold and less bubbles are generated;

[0086] The support mechanism 7 applies force to knock the surface of the mold shell 6, further ensuring that the molten plastic solution can be closely attached to the gap of the mold, reducing the generation of bubbles and improving the surface quality and structural strength of the product.

[0087] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fully enclosed rotational molding machine for polymer material molding, comprising a transmission mechanism (1), a rotating rod (2) being arranged inside the transmission mechanism (1), and a driving mechanism (3) being arranged at one end of the rotating rod (2), characterized in that: The upper and lower ends of the driving mechanism (3) are both provided with heat collecting mechanisms (4) for focusing heat energy, a mold shell (6) is provided inside the heat collecting mechanism (4), a pressurizing mechanism (5) is provided on the outer surface of the heat collecting mechanism (4) and extends into the mold shell (6) and increases the internal air pressure, and a supporting mechanism (7) is provided inside the heat collecting mechanism (4) for supporting the mold shell (6) and performing a defoaming treatment; The heat collecting mechanism (4) comprises a mounting frame (41), the mounting frame (41) being fixedly mounted on a rotating shaft of the driving mechanism (3), and the inner wall of the mounting frame (41) being provided with a plurality of heat radiating ring plates (42) with decreasing diameters and used for reflecting heat energy; The pressurizing mechanism (5) comprises two air boxes (51), the two air boxes (51) are fixedly mounted on the outer surface of the mounting frame (41), a ventilation valve (52) is arranged at the upper end of the two air boxes (51), a connecting pipe (53) is arranged at the lower part of the outer surface of the two air boxes (51), a ventilation pipe (55) is connected between the two connecting pipes (53), an air pipe (54) is arranged inside the ventilation pipe (55), and one end of the air pipe (54) passes through the ventilation pipe (55) and extends to the outside thereof.

2. A fully enclosed rotational molding machine for polymer material molding according to claim 1, characterized in that: The inner wall of the installation frame (41) is provided with a mounting frame (43), the mold shell (6) is fixedly mounted on the upper end of the mounting frame (43), and a mounting hole (44) is provided in the middle of the upper end of the mounting frame (43).

3. A fully enclosed rotational molding machine for polymer material molding according to claim 2, characterized in that: The vent pipe (55) is installed inside the mounting hole (44); a mounting ring block (57) is provided on the outer surface of the vent pipe (55); and the mounting ring block (57) is located on the upper part of the mounting frame (43); a bimetallic spring (56) is provided on the outer surface of the mounting ring block (57); a demoulding rib (9) is provided on the bottom of the inner wall of the mold shell (6); and the mold shell (6) is clamped on the bottom of the outer surface of the mounting ring block (57).

4. A fully enclosed rotational molding machine for polymer material molding according to claim 3, characterized in that: An anti-blocking head (59) is provided on the upper portion of the outer surface of the vent pipe (55); a plurality of exhaust holes (513) distributed at equal intervals are provided on the outer surface of the anti-blocking head (59); a sealing tube (58) is sleeved on the outer surface of the anti-blocking head (59); and the sealing tube (58) covers the exhaust holes (513).

5. A fully enclosed rotational molding machine for polymer material molding according to claim 4, characterized in that: A through-hole pipe head (512) is provided at the upper end of the air pipe (54), and a spiral blade (511) is provided on the upper portion of the outer surface of the air pipe (54); the through-hole pipe head (512) and the spiral blade (511) are both located inside the anti-blocking head (59) and are used to guide the airflow to be discharged through the exhaust hole (513).

6. A fully enclosed rotational molding machine for polymer material molding according to claim 5, characterized in that: The anti-blocking head (59) is located in the middle of the inner cavity of the mold shell (6), and one end of the ventilation pipe (55) and the air pipe (54) are both provided with a valve body.

7. A fully enclosed rotational molding machine for polymer material molding according to claim 2, characterized in that: The support mechanism (7) comprises a plurality of mounting blocks (72) distributed in a ring array, a support rod (71) is provided at the bottom of each of the mounting blocks (72), and the support rod (71) is fixedly mounted on the upper end of the mounting frame (43), a mounting cylinder (75) is rotatably mounted inside each of the mounting blocks (72), a support top block (74) is provided at one end of each of the mounting cylinders (75), and a hammer ball (76) is provided inside each of the mounting cylinders (75).

8. A fully enclosed rotational molding machine for polymer material molding according to claim 7, characterized in that: A groove is formed inside each of the plurality of support top blocks (74), and a hoop (73) is provided inside the groove. The plurality of support top blocks (74) abut against the outer surface of the mold shell (6).

9. A method based on the fully enclosed rotational molding machine for polymer material molding processing according to any one of claims 1 to 8, characterized in that: The use of the fully enclosed rotational molding machine is as follows: S1. Pour plastic particles into a mold shell (6) formed by joining two half molds, then install the mold shell (6) inside the heat collection mechanism (4), push the mold shell (6) into the heating chamber by moving the transmission mechanism (1), then the transmission mechanism (1) drives the rotating rod (2) to rotate, and the driving mechanism (3) drives the heat collection mechanism (4) to rotate, so that the mold shell (6) installed inside the heat collection mechanism (4) can rotate 360 ​​degrees in all directions in the heating chamber; S2, when the plastic particles inside the mold shell (6) melt, the pressurizing mechanism (5) increases the pressure inside the mold shell (6), so that the atmospheric pressure inside the mold shell (6) is higher than the atmospheric pressure outside; S3. When the heat collecting mechanism (4) rotates, the supporting mechanism (7) applies force to knock the surface of the mold shell (6), so that the molten plastic solution can be closely attached to the gap of the mold and less bubbles are generated.

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