A beach chair and a curved one-piece forming apparatus and forming method thereof
Patent Information
- Application Number
- CN202611025857.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-07-10
- Publication Date
- 2026-09-15
Smart Images
Figure CN122744598A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of beach products technology, and in particular to a beach chair, its curved surface integral molding equipment, and its molding method. Background Technology
[0002] To meet the demands for portability and lightweight design, existing beach chairs are mostly constructed from lightweight aluminum alloy or plastic tubing, resulting in a relatively light overall weight.
[0003] When used in a beach environment, the sea breeze can easily blow over or move these lightweight beach chairs, affecting normal use. Some beach chairs are fixed by adding extra sandbags to the chair legs or by inserting ground stakes into the sand, but these methods require users to carry extra accessories or perform complicated installation operations, which is inconvenient to use, and the sandbags or ground stakes are easy to lose. In the hot summer, when users sit on beach chairs for a long time, the contact surfaces between their bodies and the seat and backrest generate a lot of heat and moisture, causing stuffiness and discomfort. Existing beach chair materials have poor thermal conductivity and lack effective passive heat dissipation structures, making it difficult to dissipate heat from the contact surfaces in a timely manner.
[0004] In terms of manufacturing process, plastic chairs with pre-embedded fiberglass frames are made using injection molding. After mold closing and before injection, the pre-embedded frame needs to be fixed in the middle of the mold cavity to prevent it from shifting during high-pressure injection. The traditional method of fixing is to lift the frame with ejector pins inside the mold. However, after injection, the ejector pins will leave obvious ejector pin marks on the surface of the finished product, affecting the appearance of the product. Moreover, when the ejector pins retract, the space they occupy cannot be filled by the subsequent molten plastic, which can easily cause stress concentration or microburrs at the marks. At the same time, the recycled plastic raw materials used for injection molding often contain impurities such as sea sand and metal shavings. These impurities can clog the gating system or deposit on the product surface, reducing product quality. Summary of the Invention
[0005] This invention addresses several issues with existing beach chairs, including susceptibility to being blown over by sea breezes, stuffiness on the contact surface during prolonged sitting in summer, easy loss of external counterweight components, ejector pin marks during injection molding of fiberglass-embedded plastic beach chairs, sand impurities in recycled raw materials, and high failure rates in the mold's electrical control structure. Targeted research and development was conducted to address these problems. During the research and development process, it was discovered that existing technologies cannot simultaneously meet the multiple demands of beach comfort, windproof stability, and low-cost mass production.
[0006] Based on existing conventional designs, this invention proposes an integrated technical solution encompassing self-filling sand counterweight, passive negative pressure heat dissipation, temperature-sensitive sequential seamless injection molding, and centrifugal eddy current impurity removal. The beach chair body relies on a purely mechanical channel structure to achieve automatic sand storage and counterweight upon pressing and automatic sand unloading upon tilting, requiring no additional counterweight components. A passive heat dissipation duct is constructed using the chimney effect, automatically removing hot and humid air between the user and the chair surface without power consumption. The molding equipment utilizes the residual heat of the injection molding material to trigger a temperature-sensitive paraffin phase change, achieving sequential retraction of the ejector pins and simultaneous closure of the pouring channel. Combined with a tangential centrifugal separator, this efficiently removes sand particles and impurities from the raw material. This invention provides a beach chair, its integrated curved surface molding equipment, and its molding method.
[0007] To achieve the above objectives, the present invention adopts the following technical solution: A beach chair includes a seat cushion, a backrest, a rear support plate, and two front support legs. The backrest is fixed to the top side of the seat cushion, the rear support plate is fixed to the bottom of the seat cushion and located below the backrest, and the two front support legs are fixed to the bottom of the seat cushion and located on the side of the seat cushion away from the rear support plate. It also includes two support rods, one end of which is fixedly connected to the rear support plate, and the other end of which is fixedly connected to the two front support legs. Each support rod has a counterweight mechanism, which includes a channel within the support rod, a trapezoidal groove at the bottom of the front support legs, and multiple baffles fixed to the inner wall of the top of the channel. One end of the channel extends into the trapezoidal groove, and the other end of the channel passes through the rear support plate. In this process, by pressing the front support leg and the rear support plate into the sand, the sand enters the channel through the trapezoidal groove and flows towards the rear support plate. It is blocked by the barrier plate and retained in the support rod to form a counterweight.
[0008] In one possible design, a heat dissipation mechanism is also included, which includes multiple bosses, multiple first through holes, and multiple second through holes. The multiple bosses are fixed in an array to the top of the seat cushion and one side of the backrest. The multiple first through holes are arranged in an array inside the seat cushion, and the multiple second through holes are arranged in an array inside the backrest. Each boss has a first vent hole. The first vent holes in the multiple bosses on the seat cushion and the backrest are respectively connected to the corresponding first through holes and second through holes. The backrest has a ventilation groove, and the bottom of the ventilation groove has an air inlet. The second through holes are connected to the ventilation groove. The air in the ventilation slot expands and rises when heated, creating a negative pressure suction effect in the first vent and the second through hole to remove heat.
[0009] In one possible design, the support rod is inclined, with the height of the end of the support rod near the front support leg being greater than the height of the end near the rear support plate, and the heights of the plurality of barrier plates increasing sequentially from the front support leg toward the rear support plate.
[0010] In one possible design, the boss has multiple second ventilation holes, and the backrest has multiple strip-shaped holes.
[0011] A curved surface integral molding equipment is used for integral molding of a beach chair as described above. It includes a lower mold, an upper mold, a push mechanism, a drive mechanism, and a casting component. The upper mold and the lower mold are arranged opposite each other to perform mold closing. The push mechanism is disposed in the lower mold and includes multiple ejector pins. The gating assembly includes a gating channel disposed on the top of the upper mold and an L-shaped gating pipe, wherein the L-shaped gating pipe cooperates with the gating channel and is used to connect to the injection molding machine; The driving mechanism is disposed in the upper mold and includes a circular groove, a guide channel and an L-shaped gating pipe. The circular groove and the guide channel are connected, and the L-shaped gating pipe cooperates with the gating channel and is used to connect to the injection molding machine. The push mechanism is used to lift the pre-embedded fiberglass skeleton, and the drive mechanism is used to drive the push pin to move downward when the raw material is about to overflow, so that the raw material that has not been fully cured can fill the gap left by the removal of the push pin.
[0012] In one possible design, the ejector mechanism further includes a rectangular groove, multiple vertical rods, a push plate, multiple springs, a connecting lug, and a first vertical plate disposed within the lower mold. The rectangular groove is located below the inner cavity of the lower mold. The multiple vertical rods are vertically fixed within the rectangular groove. The push plate is slidably sleeved on the outer wall of the multiple vertical rods. The multiple springs are fixed between the bottom of the push plate and the bottom inner wall of the rectangular groove to push the push plate upward. The bottom ends of the multiple ejector pins are fixed to the top of the push plate, and the top ends of the multiple ejector pins extend slidably into the cavity of the lower mold. A sliding groove communicating with the rectangular groove is provided on one side of the lower mold. The connecting lug is slidably connected within the sliding groove and fixedly connected to the push plate. The first vertical plate is slidably connected to one side of the lower mold and fixedly connected to the top of the connecting lug.
[0013] In one possible design, the drive mechanism further includes a copper ring, a temperature-sensitive paraffin wax, a piston rod, a second vertical plate, a pin, a connecting rod, and a U-shaped closing plate. The copper ring is fixed in the circular groove and its inner hole is aligned with the pouring channel. The temperature-sensitive paraffin wax is disposed in the circular groove and the guide channel. The piston rod is slidably connected in the guide channel and one end extends to one side of the upper mold. The second vertical plate is slidably connected to one side of the upper mold via a slide rail and its bottom end abuts against the top end of the first vertical plate. The second vertical plate has a hollow groove, and both sides of the hollow groove have inclined grooves. The pin is fixedly inserted through one end of the piston rod, and both ends of the pin extend into the two inclined grooves and slide in cooperation with them. The U-shaped closing plate is slidably connected to the top of the upper mold via a slide rail and is used to close the pouring channel. One end of the connecting rod is rotatably connected to the top side of the U-shaped closing plate, and the other end of the connecting rod is rotatably connected to one side of the second vertical plate. The copper ring conducts heat to the temperature-sensitive paraffin, causing it to expand and push the piston rod to move. The second vertical plate is driven to move downward through the cooperation of the pin rod and the inclined groove. The second vertical plate pushes the first vertical plate and the push plate downward. At the same time, the connecting rod pushes the U-shaped sealing plate to move to close the casting channel.
[0014] In one possible design, a separation cylinder is provided on one side of the upper mold. The outer wall of the separation cylinder is fixedly connected to an injection hole. The injection hole is tangentially fitted to the inner wall of the separation cylinder and is used to connect to an injection molding machine. The separation cylinder is composed of a cylindrical cylinder and a conical ring from top to bottom. The top diameter of the conical ring is larger than the bottom diameter. A collecting cylinder is threadedly connected to the bottom outer wall of the conical ring. A conical cylinder is fixed to the top inner wall of the cylindrical cylinder. The bottom diameter of the conical cylinder is larger than the top diameter. The bottom of the conical cylinder extends into the conical ring. An L-shaped tube connected to the conical cylinder is fixedly passed through the separation cylinder. One end of the L-shaped tube is fixedly connected to the L-shaped casting pipe. In this process, molten raw material is injected tangentially from the injection hole to form a rotating vortex inside the separation cylinder. Impurities with higher density are thrown against the cavity wall and fall into the collection cylinder, while pure raw material enters the conical cylinder and is squeezed upward.
[0015] In one possible design, the inner wall of the conical ring is fixed with multiple spiral guide plates.
[0016] The molding method of the curved surface integral molding equipment includes the following steps: S1. Before mold closing, the spring pushes the push plate to move up along the vertical rod. The push plate drives the ejector pin to lift the pre-embedded glass fiber skeleton in the mold cavity of the lower mold and suspend it in the air. After the upper mold and the lower mold are closed, the injection molding machine injects the raw material to wrap the skeleton through the L-shaped gating pipe and the gating channel. When the raw material liquid level is close to the top of the gating channel, the injection stops and the mold is removed. S2. The heat of the residual raw material in the pouring channel is conducted to the temperature-sensitive paraffin in the circular groove through the copper ring. The paraffin expands and pushes the piston rod to move outward. The piston rod, through the pin and the inclined groove, forces the second vertical plate to move down. The second vertical plate pushes the first vertical plate and the push plate to move down against the spring force. The ejector pin retracts to be flush with the bottom inner wall of the lower mold cavity. The uncured raw material fills the gap left by the ejector pin. The skeleton is completely wrapped and there are no ejector pin marks on the surface. S3. When the second vertical plate moves down, it pushes the U-shaped sealing plate to move horizontally through the connecting rod, sealing the inlet of the pouring channel and preventing leakage of uncured raw materials; S4. Molten raw material is injected into the separation cylinder through the tangential injection hole, forming a high-speed vortex inside the cylindrical cylinder. High-density impurities are thrown to the inner wall and fall into the collection cylinder along the spiral guide plate. Pure raw material is concentrated in the central area and enters the conical cylinder upwards. It then enters the mold cavity through the L-shaped pipe and L-shaped casting pipe. Operators periodically unscrew the collection cylinder to clean impurities.
[0017] Beneficial effects: In this invention, by setting a channel inside the support rod and setting a trapezoidal groove at the bottom of the front support leg, combined with the inclined arrangement of the support rod and the baffle plate inside the channel, the function of using on-site sand as a counterweight is realized. The user only needs to press the chair into the sand, and the sand will automatically enter and be stored in the support rod, increasing the overall weight of the chair and resisting the sea wind. When it needs to be moved, the sand can be quickly discharged by tilting and bumping, making the operation convenient. In this invention, by providing protrusions, a first through hole, a second through hole, a ventilation groove, and an air inlet on the seat cushion and backrest, the protrusions reduce the heat conduction contact area between the human body and the seat surface, while the negative pressure generated by the chimney effect can actively draw in the humid and hot air between the human body and the seat surface, thus improving the comfort of long-term use. In this invention, in the curved surface integral molding equipment, by setting a spring-driven push mechanism and a drive mechanism driven by temperature-sensitive paraffin, the pre-embedded fiberglass skeleton is suspended and supported during the injection molding process, and the ejector pins are automatically retracted in the later stage of injection molding. This allows the pre-embedded fiberglass skeleton to be completely wrapped by the raw material, and no ejector pin marks are left on the surface of the finished product, eliminating stress concentration points and improving the appearance quality and structural strength of the product. In this invention, by setting a U-shaped sealing plate, a connecting rod, and a second vertical plate that cooperate with the gating channel, the gating channel is automatically closed when the ejector pin retracts. This avoids leakage of molten material during mold movement, saves material, and ensures a clean production environment. In this invention, a physical impurity separation device based on the principle of centrifugal force is constructed by setting a separation cylinder with tangential injection holes, a conical ring, a spiral guide plate, a conical cylinder and a collection cylinder. This device can separate and collect impurities such as sand and metal shavings mixed in by utilizing the flow kinetic energy of the raw materials themselves without the need for any filter screen, thus avoiding the problem of filter screen clogging, ensuring the purity of the raw materials entering the mold and reducing the product defect rate.
[0018] In this invention, regarding the beach chair, the support rod counterweight mechanism achieves sand locking upon pressing and sand discharge upon lifting, purely physical to prevent tipping; the heat dissipation mechanism generates negative pressure suction through point contact and air circulation, achieving passive air cooling without power; regarding the curved surface one-piece molding equipment, the push and drive mechanism work together to move the ejector pin downwards after the raw material wraps the frame, avoiding marks on the product surface and achieving a completely suspended, seamless one-piece wrapping of the frame; the separation cylinder uses physical rotating eddy currents to separate impurities from the raw material, eliminating the risk of clogging without a filter screen, improving production efficiency and product quality, and reducing maintenance costs. Attached Figure Description
[0019] Figure 1 A three-dimensional structural diagram of a beach chair provided by the present invention; Figure 2 This is a three-dimensional cross-sectional structural diagram of a support rod for a beach chair provided by the present invention. Figure 3 A three-dimensional exploded structural diagram of the boss and seat cushion of a beach chair provided by the present invention; Figure 4 A three-dimensional cross-sectional structural diagram of the backrest of a beach chair provided by the present invention; Figure 5 A three-dimensional structural diagram of a boss in a beach chair provided by the present invention; Figure 6 A three-dimensional structural schematic diagram of the integral molding equipment for curved surfaces provided by the present invention; Figure 7 This is a three-dimensional cross-sectional view of the lower mold of the curved surface integral molding equipment provided by the present invention; Figure 8 A three-dimensional exploded view of the push plate and spring of the curved surface integral molding device provided by the present invention; Figure 9 This is a partial cross-sectional view of the upper mold of the curved surface integral molding equipment provided by the present invention. Figure 10 This is a partial three-dimensional cross-sectional view of the second vertical plate of the curved surface integral molding device provided by the present invention. Figure 11 A three-dimensional exploded view of the separation cylinder, spiral guide plate, and collection cylinder of the curved surface integral molding equipment provided by the present invention; Figure 12 This is a three-dimensional cross-sectional view of the separation cylinder and the conical cylinder of the integral curved surface molding equipment provided by the present invention.
[0020] In the diagram: 1. Seat cushion; 2. Backrest; 3. Front support leg; 4. Rear support plate; 5. Support rod; 6. Trapezoidal groove; 7. Barrier plate; 8. Boss; 9. First through hole; 10. Second through hole; 11. First vent hole; 12. Second vent hole; 13. Strip hole; 14. Ventilation groove; 15. Air inlet; 16. Lower mold; 17. Upper mold; 18. Rectangular groove; 19. Vertical rod; 20. Push plate; 21. Spring; 22. Top 23. Needle; 24. Connecting ear; 25. First vertical plate; 26. L-shaped casting pipe; 27. Casting channel; 28. Circular groove; 29. Copper ring; 30. Guide channel; 31. Piston rod; 32. Second vertical plate; 33. Empty groove; 34. Inclined groove; 35. Pin rod; 36. Connecting rod; 37. U-shaped sealing plate; 38. Separation cylinder; 39. Injection hole; 40. Spiral guide plate; 41. Collection cylinder; 42. Conical cylinder; 43. L-shaped tube; 44. Sliding groove. Detailed Implementation
[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.
[0022] In one embodiment: Refer to Figure 1 A beach chair, relating to the field of beach product technology, mainly includes a seat cushion 1, a backrest 2, a rear support plate 4, and two front support legs 3. The backrest 2 is fixed to the top side of the seat cushion 1, the rear support plate 4 is fixed to the bottom of the seat cushion 1 and is located below the backrest 2, and the two front support legs 3 are both fixed to the bottom of the seat cushion 1 and are located on the side of the seat cushion 1 away from the rear support plate 4. The beach chair also includes two support rods 5, one end of each support rod 5 is fixedly connected to the rear support plate 4 by bolts, and the other end of each support rod 5 is fixedly connected to the two front support legs 3 by bolts. The support rods 5 are used to connect the rear support plate 4 and the front support legs 3 to enhance the overall structural strength of the beach chair.
[0023] Reference Figure 1 and Figure 2To prevent the chair from being blown over by the sea breeze, a counterweight mechanism is installed inside the support rod 5. The counterweight mechanism is used to allow sand from the beach to enter the support rod 5. The counterweight mechanism includes a channel set inside the support rod 5. The bottom of the front support leg 3 has a trapezoidal groove 6. One end of the channel extends into the trapezoidal groove 6, and the other end of the channel passes through the rear support plate 4. Multiple baffles 7 are fixed to the top inner wall of the channel. The lower end of the baffles 7 extends to the bottom inner wall of the channel, forming a narrow gap with the bottom inner wall of the channel. Sand enters the channel through the trapezoidal groove 6 and flows towards the rear support plate 4. The baffles 7 are used to increase the resistance to the flow of sand, so that the sand is retained in the support rod 5 to form a counterweight.
[0024] Specifically, when a user needs to secure the chair, the user places the chair on the beach and presses the front support leg 3 and rear support plate 4 into the sand. The sand is physically squeezed into the trapezoidal groove 6 at the bottom of the front support leg 3, and then enters the channel inside the support rod 5. The support rod 5 is set at an angle, with the end of the support rod 5 near the front support leg 3 being higher than the end near the rear support plate 4. The sand flows towards the rear support plate 4 in the channel. Multiple baffles 7 increase the resistance to the sand flow, preventing the sand from flowing out of the channel. The sand remains inside the support rod 5, forming a natural counterweight. When the user needs to move the chair, the user lifts the chair and tilts it towards the rear support plate 4. The user gently taps the chair on a hard surface, and the sand in the channel pours out from the trapezoidal groove 6.
[0025] Reference Figure 2 The support rod 5 is tilted, and the height of the end of the support rod 5 near the front support leg 3 is greater than the height of the end of the support rod 5 near the rear support plate 4. This arrangement allows sand to flow in the channel inside the support rod 5 towards the rear support plate 4. The sand flows downwards, allowing the support rod 5 to hold more sand. The height of the multiple baffles 7 increases sequentially from the front support leg 3 to the rear support plate 4. When the sand flows in the channel, the multiple baffles 7 gradually block the sand. The increasing height of the baffles 7 increases the blocking effect on the sand, keeping the sand inside the support rod 5. When the chair tilts later, the sand can still be smoothly discharged from the trapezoidal groove 6.
[0026] Reference Figures 3-5The heat dissipation mechanism is used to dissipate heat for the user when using the chair. The heat dissipation mechanism includes multiple first through holes 9 and second through holes 10. The heat dissipation mechanism also includes multiple protrusions 8 arranged in an array on the top of the seat cushion 1 and one side of the backrest 2. The multiple first through holes 9 are arranged in an array in the seat cushion 1, and the multiple second through holes 10 are arranged in an array in the backrest 2. The protrusions 8 are provided with first vent holes 11. The first vent holes 11 in the multiple protrusions 8 on the seat cushion 1 are connected to the corresponding first through holes 9. The first vent holes 11 in the multiple protrusions 8 on the backrest 2 are connected to the corresponding second through holes 10. The backrest 2 is provided with a ventilation groove 14. The bottom of the ventilation groove 14 is provided with an air inlet 15. The second through holes 10 are connected to the ventilation groove 14.
[0027] Specifically, when a person sits on the seat cushion 1 and leans against the backrest 2, the person only makes point contact with the top of the protrusion 8. The first ventilation hole 11 in each protrusion 8 is connected to the corresponding first through hole 9 or second through hole 10. When under the scorching sun, the ventilation groove 14 is heated, and the air expands and rises. The rising air generates a chimney effect in the ventilation groove 14. The chimney effect generates a physical negative pressure suction effect in the first ventilation hole 11 and the corresponding second through hole 10. The negative pressure suction effect draws the stuffy and humid air and heat generated between the person and the seat surface to the back of the chair through the first ventilation hole 11, the first through hole 9, and the second through hole 10.
[0028] Reference Figure 4 and Figure 5 The boss 8 is provided with multiple second ventilation holes 12. When negative pressure is generated in the first ventilation hole 11, the second ventilation hole 12 can draw in outside air. After the outside air is drawn in, the heat generated in the gap between the user and the backrest 2 is drawn away. The backrest 2 is provided with multiple strip holes 13. The strip holes 13 can increase the ventilation area of the backrest 2 and reduce the overall weight of the backrest 2.
[0029] In the use of a beach chair, when the user presses the front support leg 3 and the rear support plate 4 into the sand, the sand is forced into the trapezoidal groove 6 at the bottom of the front support leg 3. The sand enters the channel inside the support rod 5 from the trapezoidal groove 6. The support rod 5 is inclined, and the height of the end of the support rod 5 near the front support leg 3 is greater than the height of the end near the rear support plate 4. The sand flows from the higher end to the lower end due to its own gravity. The sand moves along the channel towards the rear support plate 4. Multiple baffles 7 fixed to the inner wall of the top of the channel increase the resistance to the flow of sand. The height of the baffles 7 increases sequentially from the front support leg 3 to the rear support plate 4, gradually blocking the backflow of sand. The sand remains in the channel, increasing the weight of the entire beach chair and making the chair less likely to be blown over by the sea breeze. When the user needs to move the chair, the user lifts the chair and tilts it towards the rear support plate 4. In the tilted state, the sand in the channel flows under the action of gravity and is discharged from the rear support plate 4. The chair returns to a lighter weight, making it easier to move. The beach chair's heat dissipation mechanism utilizes the chimney effect and the principle of hot air rising. The backrest 2 has an internal ventilation channel 14 with an air inlet 15 at its bottom. Under sunlight, the air temperature inside the ventilation channel 14 rises, its density decreases, and the hot air rises and exits from the top of the channel 14. After the hot air exits, a low-pressure area is formed inside the channel 14, drawing in outside air through the air inlet 15, creating a continuous airflow circulation. The second through hole 10 is connected to the ventilation channel 14, and the first vent within the boss 8... The hole 11 is connected to the second through hole 10. The low pressure in the ventilation groove 14 is transferred to the surface of the backrest 2. The hot and humid air between the human body and the backrest 2 is drawn into the first ventilation hole 11, enters the ventilation groove 14 through the second through hole 10, and is finally discharged to the back of the chair. The boss 8 makes the human body and the seat surface make point contact, reducing the heat conduction area and providing a channel for air flow. The second ventilation hole 12 in the boss 8 draws in hot air between the human body and the backrest 2 under negative pressure, promoting the dissipation of heat from the human body surface.
[0030] Reference Figure 6 The curved surface integral molding equipment is used to integrally mold the above-mentioned beach chair, including a lower mold 16 and an upper mold 17. The upper mold 17 and the lower mold 16 are placed one above the other for mold closing. The lower mold 16 is provided with a push mechanism, which is used to lift the pre-embedded fiberglass skeleton placed in the lower mold 16 and the upper mold 17. The push mechanism includes multiple ejector pins 22.
[0031] Reference Figure 7 and Figure 8The ejector mechanism also includes a rectangular groove 18 disposed within the lower mold 16. The rectangular groove 18 is located below the inner cavity of the lower mold 16. Multiple vertical rods 19 are vertically fixed within the rectangular groove 18. A single push plate 20 is slidably fitted onto the outer wall of each of the vertical rods 19. The push plate 20 can move up and down along the axis of the vertical rods 19. Multiple springs 21 are fixed between the bottom of the push plate 20 and the bottom inner wall of the rectangular groove 18 via spring seats. The springs 21 are used to push the push plate 20 upwards. The bottom ends of the multiple ejector pins 22 are all... Fixed to the top of the push plate 20, the tops of multiple ejector pins 22 extend slidably into the cavity of the lower mold 16. The ejector pins 22 are used to lift the pre-embedded fiberglass skeleton in the cavity. One side of the lower mold 16 is provided with a sliding groove 43 that communicates with a rectangular groove 18. A connecting ear 23 that is fixedly connected to the push plate 20 is slidably connected in the sliding groove 43. A first vertical plate 24 that is fixedly connected to the top of the connecting ear 23 is slidably connected in one side of the lower mold 16. The first vertical plate 24 can drive the connecting ear 23 and the push plate 20 to move up and down. To ensure the accuracy and reliability of the ejector pin 22's reset, a sensor for detecting the position of the push plate 20 can also be provided in the rectangular groove 18. In addition, the spring 21 is preferably a high-temperature resistant rectangular spring, and its initial preload is greater than the total weight of the push plate 20 and the ejector pins 22 to ensure that the pre-embedded fiberglass skeleton can be stably lifted when there is no external force.
[0032] Specifically, during operation, the operator places the pre-embedded fiberglass skeleton in the cavity of the lower mold 16. At this time, the push plate 20 and the ejector pin 22 move upward under the elastic force of the spring 21. The top of the ejector pin 22 lifts the pre-embedded fiberglass skeleton, and the pre-embedded fiberglass skeleton does not contact the bottom inner wall of the lower mold 16. Then, the operator places the upper mold 17 on top of the lower mold 16. The top of the pre-embedded fiberglass skeleton extends into the cavity of the upper mold 17. Later, the raw material is injected into the cavities of the lower mold 16 and the upper mold 17 through the gating channel 26. The raw material wraps around the pre-embedded fiberglass skeleton and solidifies.
[0033] Reference Figures 6-9 The top of the upper mold 17 is provided with a gating channel 26, which is used to pour molten raw materials into the mold cavities of the lower mold 16 and the upper mold 17. The upper mold 17 is provided with a driving mechanism, which is used to drive the ejector pin 22 to move down when the raw material is about to overflow through the gating channel 26. After the ejector pin 22 moves down, it releases the lifting of the pre-embedded glass fiber skeleton, so that the top of the ejector pin 22 is flush with the bottom inner wall of the mold cavity of the lower mold 16. The driving mechanism includes a circular groove 27 and a guide channel 29, which are connected.
[0034] Reference Figures 6-10The driving mechanism also includes a copper ring 28 fixed in the circular groove 27. The inner hole of the copper ring 28 is aligned with the pouring channel 26 to facilitate the flow of raw materials. The copper ring 28 is made of copper, which has excellent thermal conductivity. The circular groove 27 and the guide channel 29 are filled with thermosensitive paraffin wax. The thermosensitive paraffin wax expands in volume after being heated. The copper ring 28 is used to conduct the temperature contained in the raw materials in the pouring channel 26 to the thermosensitive paraffin wax in the circular groove 27. A piston rod 30 is slidably connected in a sealed manner in the guide channel 29. One end of the piston rod 30 extends to one side of the upper mold 17. The thermosensitive paraffin wax expands after being heated, pushing the piston rod 30 to move away from the circular groove 27. A second vertical plate 31 is slidably connected to one side of the upper mold 17 via a slide rail. The bottom of the second vertical plate 31... The end of the second vertical plate 31 abuts against the top of the first vertical plate 24. When the second vertical plate 31 moves downward, the second vertical plate 31 pushes the first vertical plate 24 downward. The first vertical plate 24 drives the push plate 20 and the ejector pin 22 to move downward. The second vertical plate 31 is provided with a hollow groove 32. The inner walls of the two sides of the hollow groove 32 that are far apart from each other are provided with inclined grooves 33. One end of the piston rod 30 extends into the hollow groove 32 and is fixedly inserted through a pin 34. The two ends of the pin 34 extend into the two inclined grooves 33 respectively. The pin 34 slides in the inclined grooves 33. When the piston rod 30 extends outward, the piston rod 30 drives the pin 34 to move. The pin 34 slides in the inclined grooves 33. Since the inclined grooves 33 are inclined relative to the horizontal direction, the movement of the pin 34 drives the second vertical plate 31 to move downward.
[0035] Reference Figure 9 and Figure 10 The top of the upper mold 17 is slidably connected to a U-shaped sealing plate 36 for sealing the pouring channel 26 via a slide rail. A connecting rod 35 is rotatably connected to one side of the top of the U-shaped sealing plate 36. The top end of the connecting rod 35 is rotatably connected to one side of the second vertical plate 31. When the second vertical plate 31 moves downward, the second vertical plate 31 pushes the U-shaped sealing plate 36 to move away from the second vertical plate 31 via the connecting rod 35. After the U-shaped sealing plate 36 moves, the closed end of the U-shaped sealing plate 36 seals the pouring channel 26 to prevent the raw material from leaking from the pouring channel 26.
[0036] Specifically, ejector pin 22, under the elastic force of spring 21, lifts the pre-embedded fiberglass skeleton, which is positioned at the center of the cavities of the lower mold 16 and the upper mold 17. An external injection molding machine injects raw material into the cavities of the lower mold 16 and the upper mold 17 through the L-shaped gating pipe 25 and the gating channel 26. The raw material begins to encapsulate the skeleton. When the raw material is about to overflow through the gating channel 26, the operator stops the injection and moves the lower mold 16 and the upper mold 17 out from under the L-shaped gating pipe 25. At this time, copper ring 28 conducts heat from the raw material to the thermosensitive paraffin wax in the circular groove 27. The thermosensitive paraffin wax absorbs heat and expands, pushing the piston rod 30 outward. Pin 34 and inclined groove 3... The second vertical plate 31 moves downward in coordination with the first vertical plate 24, the push plate 20 and the ejector pin 22. The ejector pin 22 retracts to a position flush with the bottom inner wall of the inner cavity of the lower mold 16. At this time, the material that has not yet fully solidified instantly fills the tiny gap left after the ejector pin 22 is removed under the action of gravity and fluidity. The pre-embedded fiberglass skeleton achieves complete suspension and seamless integrated coverage in the raw material. At the same time, when the second vertical plate 31 moves downward, it pushes the U-shaped closing plate 36 to move away from the second vertical plate 31 through the connecting rod 35. The U-shaped closing plate 36 just seals the pouring channel 26, preventing the unsolidified raw material from leaking from the pouring channel 26 during the later movement of the lower mold 16 and the upper mold 17.
[0037] An L-shaped gating pipe 25 is provided above the upper mold 17 to cooperate with the gating channel 26. The end of the L-shaped gating pipe 25 away from the upper mold 17 is connected to an external injection molding machine. The L-shaped gating pipe 25 is used to inject molten raw materials into the gating channel 26.
[0038] In another embodiment: Refer to Figure 6 , Figure 11 and Figure 12A separation cylinder 37 is provided on one side of the upper mold 17. A liquid injection hole 38 is fixedly connected to the outer wall of the separation cylinder 37. The liquid injection hole 38 is tangentially fitted to the inner wall of the separation cylinder 37. The end of the liquid injection hole 38 away from the separation cylinder 37 is connected to the external injection molding machine. The liquid injection hole 38 is used to inject molten raw material into the separation cylinder 37. The separation cylinder 37 is composed of a cylindrical cylinder and a conical ring from top to bottom. The outer walls of the separation cylinder 37, the L-shaped tube 42 and the collecting cylinder 40 are all covered with heating belts and insulation layers. The heating belts are electrically connected to the temperature control module of the injection molding machine. They are used to preheat the separation cylinder 37 before and during injection molding and maintain it at a preset temperature (such as the same as or slightly lower than the temperature of the molten raw material) to prevent the molten raw material from solidifying due to cooling when it flows through. Heating elements are also provided at the connection between the collecting cylinder 40 and the conical ring. The top diameter of the conical ring is larger than the bottom diameter. Multiple spiral guide plates 39 are fixed on the inner wall of the conical ring. The spiral guide plates 39 are used to guide the raw material to flow along the spiral path. The collecting cylinder 40 is threadedly connected to the bottom outer wall of the conical ring. The collecting cylinder 40 is used to collect the separated impurities. A conical cylinder 41 is fixed on the top inner wall of the cylindrical cylinder. The bottom diameter of the conical cylinder 41 is larger than the top diameter. The bottom of the conical cylinder 41 extends into the conical ring. An L-shaped tube 42 connected to the conical cylinder 41 is fixedly inserted through the separating cylinder 37. One end of the L-shaped tube 42 is fixedly connected to the L-shaped casting pipe 25.
[0039] When the molten material is injected from the injection molding machine, it is propelled by the injection pressure and enters the separator cylinder 37 through the injection hole 38. Since the injection hole 38 is tangential to the inner wall of the separator cylinder 37, the material is forced to form a high-speed physical rotating vortex within the separator cylinder 37. Based on the principle of centrifugal force, denser impurities such as sea sand and metal shavings are thrown towards the outer wall of the chamber. The material spirals downwards along the inner wall of the separator cylinder 37, and multiple spiral guide plates 39 guide the material to spiral flow within the conical ring. Impurities slide down the inner wall of the conical ring. In the bottom collection cylinder 40, the lighter and purer raw material is concentrated in the center of the vortex. The pure raw material enters the conical cylinder 41, which has a large bottom opening to facilitate the collection of the pure raw material. The pure raw material is pushed upward by the subsequent raw material and then enters the L-shaped casting pipe 25 through the L-shaped pipe 42. Finally, the pure raw material enters the mold cavity of the lower mold 16 and the upper mold 17. The entire separation process does not rely on any filter screen and achieves solid-liquid separation entirely by forcibly changing the fluid movement trajectory through geometric channels.
[0040] The curved surface one-piece molding equipment also includes a controller, which is a programmable logic controller (PLC) or a microcontroller. The controller is electrically connected to the main control system of the injection molding machine and the heating belt. The controller is used to activate the heating belt to preheat the separation cylinder 37 to the set temperature before the injection begins, and to maintain the temperature stability inside the separation cylinder 37 during the injection process according to the preset program or temperature sensor feedback, so as to ensure the fluidity of the molten material.
[0041] The molding method of the curved surface integral molding equipment includes the following steps: S1. Before mold closing, the spring 21 below the push plate 20 is in a free-length state. The elastic force of the spring 21 pushes the push plate 20 upward along the vertical rod 19. The push plate 20 drives multiple ejector pins 22 to move upward simultaneously. The top of the ejector pin 22 passes through the bottom inner wall of the lower mold cavity 16, lifting the pre-embedded fiberglass skeleton placed in the lower mold cavity 16. After being lifted, the pre-embedded fiberglass skeleton is suspended in the middle of the mold cavity, without contacting the bottom inner wall and side wall of the lower mold 16. The operator will... The upper mold 17 is placed on top of the lower mold 16 for mold closing. The top of the pre-embedded glass fiber skeleton extends into the mold cavity of the upper mold 17. The external injection molding machine injects molten raw material into the mold cavities of the lower mold 16 and the upper mold 17 through the L-shaped gating pipe 25 and the gating channel 26. The raw material gradually fills the mold cavity and wraps the pre-embedded glass fiber skeleton. When the raw material liquid level is close to the top of the gating channel 26, the operator stops the injection and removes the mold after mold closing from under the L-shaped gating pipe 25. S2. The residual raw material in the pouring channel 26 contains heat. This heat is conducted through the copper ring 28 to the thermosensitive paraffin in the circular groove 27. After absorbing the heat, the thermosensitive paraffin's temperature rises and its volume expands. The expanded thermosensitive paraffin fills the circular groove 27 and extends into the guide channel 29, pushing the piston rod 30, which is sealed and slidably connected in the guide channel 29, to move outward. The piston rod 30 drives the fixed through pin 34 to move. The two ends of the pin 34 slide in two inclined grooves 33 respectively. Since the inclined grooves 33 are inclined relative to the horizontal direction, the linear movement of the pin 34 forces the second vertical plate 31 to move downward along the slide rail. The bottom end of the second vertical plate 31 abuts against the top end of the first vertical plate 24. The second vertical plate 31 pushes the first vertical plate 24 downward. The first vertical plate 24 drives the connecting ear 23 and the push plate 20 to move downward against the elastic force of the spring 21. The push plate 20 drives multiple ejector pins 22 to move downward synchronously. The top of the ejector pin 22 retracts from the mold cavity until it is flush with the bottom inner wall of the mold cavity of the lower mold 16. At this time, since the mold cavity is filled with raw material with a certain viscosity and fluidity, and the density of the skeleton is similar to that of the raw material or the viscosity of the raw material is sufficient to provide support, the skeleton is suspended in the raw material and will not be significantly displaced due to the withdrawal of the ejector pin 22. The raw material that has not been completely cured instantly fills the tiny gap left after the ejector pin 22 is withdrawn under the action of gravity and fluidity. The pre-embedded glass fiber skeleton is completely wrapped by the raw material, and no ejector pin 22 imprint is left on the surface of the finished product. S3. As the second vertical plate 31 moves downward, the second vertical plate 31 drives the connecting rod 35, which is rotatably connected to it, to move. The connecting rod 35 pushes the U-shaped closing plate 36 to move horizontally along the slide rail at the top of the upper mold 17. The closed end of the U-shaped closing plate 36 moves to the top of the gating channel 26, sealing the entrance of the gating channel 26. The sealed gating channel 26 prevents uncured raw materials in the mold cavity from leaking during the mold movement. S4. Before entering the gating system, the molten material passes through the separator 37 for impurity separation. The external injection molding machine injects the molten material into the separator 37 through the injection hole 38. The injection hole 38 is tangential to the inner wall of the separator 37. The material enters the cylindrical part of the separator 37 tangentially. Under the pressure of injection, the material forms a high-speed rotating vortex inside the cylinder. High-density impurities such as sea sand and metal shavings are thrown towards the inner wall of the separator 37 under centrifugal force. The material flows spirally downward along the inner wall and enters the conical ring part. The diameter of the conical ring gradually decreases from top to bottom, increasing the rotation speed of the material. Multiple spiral guide plates 39 fixed on the inner wall of the conical ring guide the material to continue downward along the spiral path. As the material flows, impurities slide down the inner wall of the conical ring to the bottom collection cylinder 40. The less dense and purer raw material is concentrated in the central area of the vortex. The pure raw material in the central area enters the conical cylinder 41 upward. The bottom diameter of the conical cylinder 41 is larger than the top diameter. The pure raw material in the central area is pushed into the conical cylinder 41 by the subsequent raw material and flows upward through the L-shaped pipe 42. The pure raw material enters the L-shaped casting pipe 25 from the L-shaped pipe 42 and finally enters the mold cavity of the lower mold 16 and the upper mold 17. The entire separation process of the separation cylinder 37 does not rely on the filter screen. Solid-liquid separation is achieved only by the rotational flow of the raw material itself. The operator periodically unscrews the collection cylinder 40 from the bottom of the conical ring to clean the impurities accumulated in the collection cylinder 40.
[0042] To ensure the long-term stable operation of the equipment, operators should perform regular maintenance. Maintenance includes: unscrewing the collection cylinder 40 to clean the separated impurities; cleaning the inner wall of the separation cylinder 37, the spiral guide plate 39, and the L-shaped tube 42 to prevent impurity accumulation; applying high-temperature resistant grease to the sliding mating surfaces of the ejector pin 22 and the lower mold 16, and cleaning any scale buildup that may have accumulated over time, ensuring smooth operation and good sealing of the ejector pin 22.
[0043] The accompanying drawings in this application are for illustrative purposes only. The dimensions and shapes of the components shown are not actual limitations but are merely schematic representations. In actual implementation, the components can be reasonably configured and adjusted according to specific needs and actual conditions.
[0044] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.
Claims
1. A beach chair, comprising a seat cushion (1), a backrest (2), a rear support plate (4), and two front support legs (3), wherein the backrest (2) is fixed to the top side of the seat cushion (1), the rear support plate (4) is fixed to the bottom of the seat cushion (1) and located below the backrest (2), and both front support legs (3) are fixed to the bottom of the seat cushion (1) and located on the side of the seat cushion (1) away from the rear support plate (4), characterized in that, It also includes two support rods (5), one end of each of the two support rods (5) is fixedly connected to the rear support plate (4), and the other end of each of the two support rods (5) is fixedly connected to the two front support legs (3). The support rods (5) are provided with a counterweight mechanism, which includes a channel in the support rods (5), a trapezoidal groove (6) at the bottom of the front support legs (3), and a plurality of baffles (7) fixed to the inner wall of the top of the channel. One end of the channel extends into the trapezoidal groove (6), and the other end of the channel passes through the rear support plate (4). In this process, by pressing the front support leg (3) and the rear support plate (4) into the sand, the sand enters the channel through the trapezoidal groove (6) and flows towards the rear support plate (4), and is blocked by the barrier plate (7) and retained in the support rod (5) to form a counterweight.
2. A beach chair according to claim 1, characterized in that, It also includes a heat dissipation mechanism, which includes multiple bosses (8), multiple first through holes (9) and multiple second through holes (10). The multiple bosses (8) are arranged in an array and fixed on the top of the seat cushion (1) and one side of the backrest (2). The multiple first through holes (9) are arranged in an array in the seat cushion (1), and the multiple second through holes (10) are arranged in an array in the backrest (2). The bosses (8) are provided with first ventilation holes (11). The first ventilation holes (11) in the multiple bosses (8) on the seat cushion (1) and the backrest (2) are respectively connected to the corresponding first through holes (9) and second through holes (10). The backrest (2) is provided with a ventilation groove (14). The bottom of the ventilation groove (14) is provided with an air inlet (15). The second through holes (10) are connected to the ventilation groove (14). The air in the ventilation groove (14) expands and rises when heated, generating a negative pressure suction effect in the first vent (11) and the second through hole (10) to remove heat.
3. A beach chair according to claim 2, characterized in that, The support rod (5) is inclined, and the height of the end of the support rod (5) near the front support leg (3) is greater than the height of the end near the rear support plate (4). The height of the multiple barrier plates (7) increases sequentially from the front support leg (3) to the rear support plate (4).
4. A beach chair according to claim 3, characterized in that, The boss (8) has multiple second ventilation holes (12), and the backrest (2) has multiple strip holes (13).
5. A curved surface integral molding equipment, used for integral molding of a beach chair as described in claim 4, characterized in that, It includes a lower mold (16), an upper mold (17), a push mechanism, a drive mechanism, and a gating assembly; the upper mold (17) and the lower mold (16) are arranged opposite each other to perform mold closing; the push mechanism is located in the lower mold (16) and includes multiple ejector pins (22); The gating assembly includes a gating channel (26) disposed on the top of the upper mold (17) and an L-shaped gating pipe (25), the L-shaped gating pipe (25) cooperating with the gating channel (26) and used to connect to the injection molding machine; The driving mechanism is located in the upper mold (17) and includes a circular groove (27), a guide channel (29) and an L-shaped gating pipe (25). The circular groove (27) and the guide channel (29) are connected. The L-shaped gating pipe (25) cooperates with the gating channel (26) and is used to connect to the injection molding machine. The push mechanism is used to lift the pre-embedded fiberglass skeleton, and the drive mechanism is used to drive the push pin (22) to move down when the raw material is about to overflow, so that the raw material that has not been fully cured fills the gap left by the removal of the push pin (22).
6. The curved surface integral molding equipment according to claim 5, characterized in that, The push mechanism further includes a rectangular groove (18) disposed in the lower mold (16), multiple vertical rods (19), a push plate (20), multiple springs (21), a connecting lug (23), and a first vertical plate (24). The rectangular groove (18) is located below the inner cavity of the lower mold (16). The multiple vertical rods (19) are vertically fixed in the rectangular groove (18). The push plate (20) is slidably sleeved on the outer wall of the multiple vertical rods (19). The multiple springs (21) are fixed between the bottom of the push plate (20) and the bottom inner wall of the rectangular groove (18). Push the push plate (20) upward, the bottom ends of the plurality of ejector pins (22) are fixed to the top of the push plate (20), and the top ends of the plurality of ejector pins (22) are sealed and slidably extended into the cavity of the lower mold (16). The lower mold (16) has a sliding groove (43) on one side that communicates with the rectangular groove (18). The connecting ear (23) is slidably connected in the sliding groove (43) and fixedly connected to the push plate (20). The first vertical plate (24) is slidably connected to one side of the lower mold (16) and fixedly connected to the top of the connecting ear (23).
7. The curved surface integral molding equipment according to claim 6, characterized in that, The driving mechanism also includes a copper ring (28), a thermosensitive paraffin wax, a piston rod (30), a second vertical plate (31), a pin (34), a connecting rod (35), and a U-shaped sealing plate (36). The copper ring (28) is fixed in the circular groove (27) and its inner hole is aligned with the pouring channel (26). The thermosensitive paraffin wax is disposed in the circular groove (27) and the guide channel (29). The piston rod (30) is slidably connected in the guide channel (29) and one end extends to one side of the upper mold (17). The second vertical plate (31) is slidably connected to one side of the upper mold (17) via a slide rail and its bottom end is aligned with the first vertical plate (24). The top of the plate is in contact with the bottom. The second vertical plate (31) is provided with a slot (32). The inner walls of both sides of the slot (32) are provided with inclined slots (33). The pin (34) is fixedly inserted through one end of the piston rod (30). The two ends of the pin (34) extend into the two inclined slots (33) and slide with them. The U-shaped closing plate (36) is slidably connected to the top of the upper mold (17) through a slide rail and is used to close the pouring channel (26). One end of the connecting rod (35) is rotatably connected to the top side of the U-shaped closing plate (36), and the other end of the connecting rod (35) is rotatably connected to one side of the second vertical plate (31). The copper ring (28) conducts heat to the thermosensitive paraffin, causing it to expand and push the piston rod (30) to move. The second vertical plate (31) is driven to move down through the cooperation of the pin (34) and the inclined groove (33). The second vertical plate (31) pushes the first vertical plate (24) and the push plate (20) to move down. At the same time, the connecting rod (35) pushes the U-shaped sealing plate (36) to move to close the casting channel (26).
8. The curved surface integral forming equipment according to claim 7, characterized in that, The upper mold (17) has a separation cylinder (37) on one side. The outer wall of the separation cylinder (37) is fixedly connected to an injection hole (38). The injection hole (38) is tangentially fitted to the inner wall of the separation cylinder (37) and is used to connect to an injection molding machine. The separation cylinder (37) is composed of a cylindrical cylinder and a conical ring from top to bottom. The top diameter of the conical ring is larger than the bottom diameter. The bottom outer wall of the conical ring is threadedly connected to a collection cylinder (40). The top inner wall of the cylindrical cylinder is fixedly connected to a conical cylinder (41). The bottom diameter of the conical cylinder (41) is larger than the top diameter. The bottom of the conical cylinder (41) extends into the conical ring. An L-shaped tube (42) connected to the conical cylinder (41) is fixedly passed through the separation cylinder (37). One end of the L-shaped tube (42) is fixedly connected to the L-shaped casting pipe (25). The molten raw material is injected tangentially from the injection hole (38) to form a rotating vortex in the separation cylinder (37). The denser impurities are thrown against the cavity wall and fall into the collection cylinder (40), while the pure raw material enters the conical cylinder (41) and is squeezed upward.
9. The curved surface integral molding equipment according to claim 8, characterized in that, The inner wall of the conical ring is fixed with multiple spiral guide plates (39).
10. A molding method using a curved surface integral molding equipment, applied to a beach chair as described in claim 9, characterized in that, Includes the following steps: S1. Before mold closing, spring (21) pushes push plate (20) to move up along vertical rod (19). Push plate (20) drives ejector pin (22) to lift the pre-embedded glass fiber skeleton in the mold cavity of lower mold (16) and suspend it in the air. After upper mold (17) and lower mold (16) are closed, the injection molding machine injects raw material to wrap the skeleton through L-shaped gating pipe (25) and gating channel (26). When the raw material liquid level is close to the top of gating channel (26), the injection stops and the mold is removed. S2. The heat of the residual raw material in the pouring channel (26) is conducted to the temperature-sensitive paraffin in the circular groove (27) through the copper ring (28). The paraffin expands and pushes the piston rod (30) to move outward. The piston rod (30) cooperates with the inclined groove (33) through the pin (34) to force the second vertical plate (31) to move down. The second vertical plate (31) pushes the first vertical plate (24) and the push plate (20) to overcome the elastic force of the spring (21) and move down. The ejector pin (22) retracts to be flush with the bottom inner wall of the mold cavity of the lower mold (16). The uncured raw material fills the gap left by the ejector pin (22). The skeleton is completely wrapped and there is no ejector pin (22) mark on the surface. S3. When the second vertical plate (31) moves down, it pushes the U-shaped closing plate (36) to move horizontally through the connecting rod (35), thereby closing the entrance of the pouring channel (26) and preventing the leakage of uncured raw materials. S4. The molten raw material is injected into the separation cylinder (37) through the tangential injection hole (38), forming a high-speed vortex in the cylindrical cylinder. The dense impurities are thrown to the inner wall and fall into the collection cylinder (40) along the spiral guide plate (39). The pure raw material is concentrated in the central area and enters the conical cylinder (41) upwards. It enters the mold cavity through the L-shaped pipe (42) and the L-shaped casting pipe (25). The operator regularly unscrews the collection cylinder (40) to clean the impurities.