Natural rubber forming mold capable of reducing overflow and forming process

Abstract

The application discloses a natural latex forming die capable of reducing overflow and a forming process, relates to the latex forming technical field, and aims to solve the overflow generated in the forming process of the current latex product and various disadvantages in the forming process.The technical scheme is as follows: the forming die comprises an upper die and a lower die, the upper die and the lower die form a die cavity, a pouring port and a plurality of overflow holes are formed in the upper die, the upper part of the pouring port is connected with a pouring pipe, and the upper part of the overflow hole is connected with an overflow pipe; a buffer tank with a buffer cavity is further arranged, the buffer tank is provided with a connecting pipe and a plurality of buffer pipes, the buffer pipes extend into the buffer cavity from the lower part of the buffer tank, and the buffer pipes correspond to the overflow pipes one by one.The application reduces the overflow waste of the latex forming, maintains the surface integrity of the product in the flow channel, and improves the surface quality of the latex product forming.

Description

Technical Field

[0001] This invention relates to the field of latex technology, and more specifically, to a natural latex molding mold that reduces overflow, and to a natural latex molding process. Background Technology

[0002] Natural latex is obtained from the latex flowing from rubber trees. The natural latex is processed using latex processing techniques, such as centrifugation or evaporation, to obtain concentrated latex with a solid content of over 60%. Then, through a latex molding process, the latex is foamed and molded to obtain a sponge-like product. The finished product retains the advantages of natural latex and can be made into latex mattresses, latex pillows, latex bras, and other products.

[0003] During the production of latex products, a foaming process is required to create a foamed structure filled with tiny air bubbles. In the molding process, this foamed latex is injected into a mold and cured using a molding technique. However, to ensure the latex completely fills the mold and removes all internal air, an amount of foamed latex larger than the mold cavity volume needs to be injected. Excessive latex will overflow from the mold, resulting in significant waste of latex raw materials. Furthermore, the overflowing latex scattered outside the mold will pollute the latex production environment.

[0004] Especially for small latex products, such as latex bra cup pads, the amount of latex overflowing each time is relatively fixed due to the small size of the product. This results in a much larger proportion of overflowing latex relative to the actual amount needed for the latex product, meaning a greater proportion of latex is wasted.

[0005] Therefore, a new solution is needed to address this problem. Summary of the Invention

[0006] The purpose of this invention is to solve the above-mentioned problems by providing a natural latex molding mold that can reduce overflow, buffer the latex that overflows during the latex molding process, reduce the waste of overflowed latex, and optimize the latex delivery channel.

[0007] The above-mentioned technical objective of the present invention is achieved through the following technical solution: a natural latex molding mold that can reduce overflow, comprising an upper mold and a lower mold, the upper mold and the lower mold together forming a mold cavity, the upper mold having an injection port and a plurality of overflow holes, the upper part of the injection port being connected to an injection pipe, and the upper part of the overflow holes being connected to an overflow pipe; further comprising a buffer box with an internal buffer cavity, the buffer box having a connecting pipe and a plurality of buffer pipes, the buffer pipes extending from the lower part of the buffer box into the buffer cavity and corresponding one-to-one with the overflow pipes, the lower end of the buffer pipe being used to communicate with the overflow pipe, and the upper end being used to communicate with the buffer cavity, for guiding the latex overflowing from the overflow pipe into the buffer cavity; the connecting pipe penetrating the buffer box vertically, the upper end being used for latex injection, and the lower end being used to connect with the injection pipe of the upper mold, the connecting pipe having a through hole at the side wall position where it extends into the buffer cavity, the through hole being used to guide the latex in the buffer cavity into the connecting pipe.

[0008] The present invention is further configured such that the upper outer periphery of the overflow pipe is a second conical surface, and the lower inner periphery of the buffer pipe is provided with a sealing sleeve, the lower inner periphery of the sealing sleeve being a first conical surface, and the sealing sleeve can be fitted onto the upper end of the overflow pipe, with the first and second conical surfaces mutually adapted to achieve sealing.

[0009] The invention is further configured such that an annular limiting groove for accommodating a sealing sleeve is formed on the inner circumference of the buffer tube, the sealing sleeve piston is connected to the limiting groove and can be adjusted up and down, and a spring is elastically pressed between the upper end face of the sealing sleeve and the upper end face of the limiting groove, the spring being used to elastically press down and limit the sealing sleeve.

[0010] The present invention is further configured such that the upper end of the buffer tube extends into the buffer cavity, and a plurality of through holes are formed at one end extending into the buffer cavity, through which the inner cavity of the buffer tube and the buffer cavity are connected.

[0011] The invention is further configured such that the connecting pipe is located in the middle of the buffer box, the bottom of the buffer cavity inside the buffer box is a slope, and the slope slopes downward toward one side of the connecting pipe, so that the latex overflowing into the buffer cavity can be guided toward the connecting pipe through the slope.

[0012] The present invention is further configured such that an inwardly protruding convex ring is provided on the lower inner circumference of the connecting pipe, both the upper and lower sides of the convex ring are tapered, and a constriction opening is formed at the convex ring, which is larger at the upper and lower ends and gradually narrows in the middle; a through hole is provided at the outer circumference of the constriction opening, and the through hole connects the inner circumference of the connecting pipe and the buffer cavity.

[0013] The invention is further configured such that the lower side of the constriction is a conical surface three, and the upper outer periphery of the injection tube is a conical surface four. Conical surfaces three and four are mutually adapted to achieve a fitted seal. Rubber sealing rings can be installed at the four conical surfaces of the injection tube to achieve a seal when conical surfaces three and four are fitted together.

[0014] The present invention is further configured such that a manifold is sleeved inside the buffer cavity corresponding to the outer periphery of the connecting pipe, the upper end of the manifold is fixedly connected to the upper wall of the buffer cavity, and a gap is formed between the lower end of the manifold and the lower wall of the buffer cavity; the lower end of the manifold extends to the lower side of the through hole one; a plurality of air guide holes are opened in the buffer cavity corresponding to the upper position of the manifold, and the air guide holes are used to connect the manifold.

[0015] The invention is further configured such that a floating ring is provided inside the manifold, the floating ring is sleeved between the connecting pipe and the manifold, and can be adjusted up and down; a venting cover is provided on the top of the buffer box, the venting cover covers each venting hole inside, and a venting pipe is connected to the outside of the venting cover. A solenoid valve is installed on the venting pipe.

[0016] The invention is further configured such that the floating ring is sleeved between the connecting pipe and the manifold, and is sealed and piston-connected to the outer circumference of the connecting pipe and the inner circumference of the manifold; the upper part of the buffer box has several air outlets, and solenoid valves are installed at the air outlets.

[0017] The invention is further configured such that the floating ring has several vertically penetrating balance holes, and a sealing sheet is elastically covered on the upper surface of the floating ring. The sealing sheet is used to elastically cover the upper side of the balance holes, so as to realize the opening and closing of the balance holes. A retaining ring is fixedly connected to the upper outer periphery of the balance holes, and the outer periphery of the sealing sheet is connected to the retaining ring. The inner periphery of the retaining ring can elastically swing up and down to realize the opening and closing switching of the balance holes.

[0018] The invention is further configured such that the through hole is inclined downwards towards the inner circumference of the constriction, and a one-way valve structure for unidirectional flow in the inner circumference of the constriction is provided inside the through hole; the one-way valve structure includes a connecting block, a stop block, and an elastic baffle; the connecting block is fixedly connected to the upper side of the through hole, the stop block is fixedly connected to the lower side of the through hole, the upper edge of the elastic baffle is fixedly connected to the connecting block, and the lower edge of the elastic baffle is used to press against the stop block to achieve a seal; the elastic baffle can elastically swing in the inner circumference of the constriction within the through hole to open the through hole.

[0019] This invention also discloses a natural latex molding process that reduces overflow. The process involves using the aforementioned natural latex molding mold. During molding, the lower mold is placed on a support platform, and the upper and lower molds are fitted together. A buffer box is installed on the upper part of the upper mold. The connecting pipe between the buffer box and the upper mold is connected to the injection pipe, and the buffer pipe is connected to the overflow pipe. A pressure rod is used to press the buffer box firmly on its upper part, thus assembling the buffer box and the mold. Latex is injected from the upper part of the connecting pipe, passing through the connecting pipe and the injection pipe into the mold cavity until the cavity is full. During the filling process, some latex overflows upwards from the overflow pipe at the upper part of the upper mold. The overflowing latex flows through the buffer pipe into the buffer cavity, where it collects. The collected latex can be reused and then flows unidirectionally from a through-hole in the connecting pipe back into the connecting pipe, achieving latex recycling.

[0020] In summary, the present invention has the following beneficial effects:

[0021] By setting up a buffer box, the buffer tubes and overflow tubes within the buffer box correspond one-to-one. During installation, the lower end of the buffer tube can be nested with the overflow tube to achieve communication, while the upper end can connect to the buffer chamber. Latex overflowing from the overflow tube can be guided into the buffer chamber through the overflow tube and the buffer tube, achieving the collection of overflowing latex in the buffer chamber, thereby reducing latex overflow waste and improving the utilization rate of latex raw materials. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of a natural latex molding mold that can reduce overflow according to the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of a natural latex molding die system that can reduce overflow according to the present invention;

[0024] Figure 3 This is an enlarged structural schematic diagram of the buffer tube of the buffer box of the present invention;

[0025] Figure 4 This is an enlarged structural schematic diagram of the connecting pipe of the buffer box of the present invention;

[0026] Figure 5 This is an enlarged structural schematic diagram of the floating ring of the present invention;

[0027] Figure 6 This is a schematic diagram of the one-way valve structure of the through hole one of the present invention.

[0028] Reference numerals: 1. Lower mold; 2. Upper mold; 3. Mold cavity; 4. Inlet; 5. Inlet tube; 6. Overflow hole; 7. Overflow pipe; 8. Buffer box; 9. Buffer chamber; 10. Buffer tube; 11. Connecting pipe; 12. Air outlet; 14. Inclined surface; 15. Support platform; 16. Pressure rod; 17. Limiting groove one; 18. Sealing sleeve; 19. Conical surface one; 20. Conical surface two; 21. Spring one; 22. Through hole two; 23. Convex ring; 24. Narrowing; 25. Conical surface three; 26. Conical surface four; 27. Through hole one; 28. Manifold; 29. ​​Gap; 30. Air guide hole; 31. Air guide cover; 32. Air guide pipe; 33. Floating ring; 34. Balance hole; 35. Sealing plate; 36. Retaining ring; 37. Elastic pad; 38. Connecting block; 39. Stop block; 40. Elastic baffle. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0030] This embodiment discloses a natural latex molding mold that can reduce overflow, such as... Figure 1 As shown, it includes an upper mold 2, a lower mold 1, and a buffer box 8. The upper mold 2 and the lower mold 1 are compatible with each other. The upper mold 2 can be installed on the lower mold 1. The upper mold 2 and the lower mold 1 together form a mold cavity 3. The shape inside the mold cavity 3 is the shape of the product to be produced. During the molding process, latex is injected into the mold cavity 3 to obtain the product of the required shape. Through subsequent processes, the corresponding product can be obtained.

[0031] A sprue 4 is provided on the upper part of the upper mold 2, and an overflow hole 6 is provided on the outer side of the sprue 4 to ensure that the latex completely fills the mold cavity 3 during injection, facilitating the discharge of other gases within the mold cavity 3. A sprue tube 5 is connected to the upper part of the sprue 4, allowing latex to be easily injected into the mold cavity 3 from the upper end of the sprue tube 5. An overflow pipe 7 is connected to the upper part of the overflow hole 6, which cooperates with the buffer box 8 to allow air to flow out of the mold cavity 3 and to collect overflowing latex. Both the sprue tube 5 and the overflow pipe 7 have an upwardly protruding structure, forming a mutually fitting and interlocking structure with the buffer box 8.

[0032] The buffer box 8 is adapted to the upper part of the upper mold 2. The inner cavity of the buffer box 8 is hollow, forming a buffer cavity 9 structure. A connecting pipe 11 and several buffer pipes 10 are installed at the lower part of the buffer box 8. The connecting pipe 11 is adapted to the injection pipe 5, and each buffer pipe 10 is adapted to each overflow pipe 7, so that the buffer box 8 and the upper mold 2 can be assembled.

[0033] The connecting pipe 11 extends through the buffer box 8 from top to bottom. Its upper end can be connected to the latex injection line to introduce the latex. The lower end of the connecting pipe 11 extends through to the lower side of the buffer box 8. The connecting pipe 11 can be sleeved with the upper end of the injection pipe 5 to achieve a sealed connection between the injection pipe 5 and the connecting pipe 11.

[0034] The buffer tube 10 extends from the lower part of the buffer box 8 into the buffer cavity 9, penetrating the lower side wall of the buffer cavity 9 vertically. The buffer tube 10 corresponds one-to-one with the overflow tube 7. During installation, the lower end of the buffer tube 10 can be interlocked with the overflow tube 7 to achieve communication, while the upper end can connect to the buffer cavity 9. Latex overflowing from the overflow tube 7 can be guided into the buffer cavity 9 through the overflow tube 7 and the buffer tube 10, achieving the collection of overflowing latex in the buffer cavity 9, thereby reducing latex overflow waste and improving the utilization rate of latex raw materials.

[0035] Furthermore, a through hole 27 can be made at the position where the connecting tube 11 extends into the side wall of the buffer cavity 9. The through hole 27 can guide the latex in the buffer cavity 9 into the connecting tube 11 and allow the overflowing latex stored in the buffer cavity 9 to be channeled into the connecting tube 11, thereby making the latex in the buffer cavity 9 usable.

[0036] When using this molding die, such as Figure 2 As shown, the lower mold 1 is placed on the support platform 15, and the upper mold 2 and the lower mold 1 are fitted together. The buffer box 8 is installed on the upper part of the upper mold 2. The connecting pipe 11 between the buffer box 8 and the upper mold 2 is connected to the injection pipe 5, and the buffer pipe 10 is connected to the overflow pipe 7. The buffer box 8 is pressed down on the upper part by the pressure rod 16, thereby realizing the assembly between the buffer box 8 and the mold. The pressure rod 16 can be a telescopic pneumatic rod 16 or a hydraulic rod 16.

[0037] Latex is injected into the upper part of the connecting pipe 11, and then injected into the mold cavity 3 through the connecting pipe 11 and the injection pipe 5 until the mold cavity 3 is filled with latex. During the process of filling the mold cavity 3, some latex overflows upward from the overflow pipe 7 at the upper part of the upper mold 2. The overflowing latex flows into the buffer cavity 9 through the buffer pipe 10, forming a pool of overflowing latex in the buffer cavity 9. As the latex continues to accumulate in the buffer cavity 9, it can form a pool of latex that can be reused. The pooled latex can then flow unidirectionally from the through hole 27 of the connecting pipe 11 back into the interior of the connecting pipe 11, realizing the recycling of latex and reducing latex waste.

[0038] To facilitate the connection and adaptation between the overflow pipe 7 and the buffer pipe 10 and improve the stability after assembly, several elastic pads 37 can be installed at the bottom of the buffer box 8. The elastic pads 37 play an elastic buffering role; thereby, the support stability between the buffer box 8 and the upper mold 2 is improved when the buffer box 8 is installed.

[0039] like Figure 3 As shown, the upper outer circumference of the overflow pipe 7 is a conical surface 20, and the lower inner circumference of the buffer pipe 10 is fitted with a sealing sleeve 18. The lower inner circumference of the sealing sleeve 18 is a conical surface 19, and the conical surface 19 and the conical surface 20 are mutually sealingly fitted. The sealing sleeve 18 can be fitted onto the upper end of the overflow pipe 7, so the conical surface 19 and the conical surface 20 are mutually fitted, achieving a fitted seal and maintaining the sealing effect after the two are fitted together. The sealing sleeve 18 can be made of elastic sealing material. After fitting together, the sealing sleeve 18 and the upper end of the overflow pipe 7 can be pressed against each other, and the pressure maintains the mutual seal between the two.

[0040] Furthermore, the sealing sleeve 18 can adopt a floating structure. An annular limiting groove 17 is formed on the inner circumference of the buffer tube 10. The sealing sleeve 18 can be accommodated through the limiting groove 17, and the sealing sleeve 18 can float elastically up and down within the limiting groove 17. This ensures that a stable sealing state is maintained between the buffer tube 10 and the overflow tube 7 when each overflow tube 7 is in a different position.

[0041] The outer periphery of the sealing sleeve 18 and the inner wall of the limiting groove 17 form a piston connection, allowing for upper and lower piston adjustment. A spring 21 is installed between the upper end face of the sealing sleeve 18 and the upper end face of the limiting groove 17. The spring 21 can elastically press the sealing sleeve 18 downward and push it downward. When the overflow pipe 7 is inserted into the buffer pipe 10, a stable sealing state can be maintained between the overflow pipe 7 and the buffer pipe 10.

[0042] The upper end of the buffer tube 10 extends into the buffer cavity 9, and several through holes 22 are formed at the end extending into the buffer cavity 9. The through holes 22 connect the inner cavity of the buffer tube 10 and the buffer cavity 9, allowing the latex overflowing from the buffer tube 10 to flow into the buffer cavity 9, thus enabling the latex to accumulate in the buffer cavity 9. The upper end of the buffer tube 10 can press against and connect with the upper side wall of the buffer cavity 9, thereby forming a support structure between the upper and lower side walls of the buffer cavity 9 to increase the overall strength of the buffer box 8.

[0043] Several air vents 12 can be opened at the upper part of the buffer box 8. The air vents 12 can maintain the air pressure balance of the buffer chamber 9, thereby allowing the latex to flow smoothly in the mold cavity 3 and overflow smoothly in the buffer chamber 9. Furthermore, a solenoid valve can be installed at the air vents 12 to control the opening and closing of the air vents 12, thereby actively controlling the flow of latex.

[0044] like Figure 4As shown, an inwardly protruding ring 23 is formed on the inner circumference of the connecting tube 11 near the lower side. Both the upper and lower sides of the ring 23 are tapered. A constriction 24, which is larger at the upper and lower ends and gradually narrows in the middle, is formed at the ring 23, forming a funnel-shaped structure. A through hole 27 is opened on the outer circumference of the constriction 24, connecting the inner circumference of the connecting tube 11 and the buffer cavity 9. Through the through hole 27, the latex overflowing from the buffer cavity 9 can be drawn back into the connecting tube 11, thereby realizing the reuse of the overflowing latex.

[0045] Because the constriction 24 has a structure that expands at both ends and narrows in the middle, the latex will exhibit a Venturi adsorption structure at the constriction 24 during the transport process within the connecting tube 11. This allows for relatively high-speed flow through the flow channels within the connecting tube 11, reducing the pressure at the constriction 24 and generating an adsorption force towards the tube at the through-hole 27. This allows the overflow latex accumulated in the buffer chamber 9 to be reused. Through the effect of negative pressure adsorption, the overflow latex in the buffer chamber 9 can be recycled, improving the utilization rate of the latex and offering excellent convenience.

[0046] Furthermore, the structure of the through-hole 27 can be further optimized to allow the latex in the buffer cavity 9 to flow more smoothly into the connecting pipe 11. For example... Figure 6 As shown, the through hole 27 is inclined downward in the direction of the inner circumference of the constriction 24, and a one-way valve structure is provided in the through hole 27 to unidirectionally guide the flow in the direction of the inner circumference of the constriction 24; through the one-way valve structure, the latex can flow unidirectionally from the buffer chamber 9 to the constriction 24 of the connecting pipe 11, and prevent the latex in the connecting pipe 11 from being squeezed into the buffer chamber 9 in the opposite direction.

[0047] like Figure 6 As shown, the one-way valve structure includes a connecting block 38, a stop block 39, and an elastic baffle 40. The connecting block 38 is fixedly connected to the upper side of the through hole 27, the stop block 39 is fixedly connected to the lower side of the through hole 27, and the upper edge of the elastic baffle 40 is fixedly connected to the connecting block 38. The lower edge of the elastic baffle 40 is used to press against the stop block 39 to achieve a seal. The elastic baffle 40 is connected at the upper connecting block and is movable at the lower stop block 39. Under the elasticity of the elastic baffle 40, it can automatically and elastically press against the stop block to close the through hole 27. When an adsorption force is generated at the through hole 27 towards the constriction 24, the elastic baffle 40 can elastically swing towards the constriction 24 to open the through hole 27, allowing the latex to flow smoothly into the constriction 24, thus achieving smooth latex flow.

[0048] Furthermore, the lower part of the constriction 24 is a conical surface 25, and the upper outer periphery of the injection tube 5 is a conical surface 26. Conical surfaces 25 and 26 are mutually compatible to achieve a fitted seal. To maintain the stability of the two during assembly, a rubber sealing ring can be installed at the conical surface 26 of the injection tube 5 to achieve a seal when conical surfaces 25 and 26 are fitted together.

[0049] like Figure 1 As shown, in order to allow the latex to smoothly converge in the buffer chamber 9, the connecting pipe 11 can be positioned in the middle of the buffer box 8, and the bottom of the buffer chamber 9 in the buffer box 8 can be sloped 14. The slope 14 slopes downward towards the connecting pipe 11, and the latex overflowing into the buffer chamber 9 can be guided towards the connecting pipe 11 through the slope 14, so that the latex can converge in the buffer chamber 9 and converge at the outer periphery of the connecting pipe 11, which facilitates the smooth return of the converged latex through the through hole 27, and facilitates the reuse of the overflowing latex.

[0050] Furthermore, the latex reflux structure within the buffer chamber 9 can be further optimized, such as... Figure 1 , 4 As shown, a manifold 28 can be fitted inside the buffer chamber 9 corresponding to the outer periphery of the connecting pipe 11. The upper end of the manifold 28 is fixedly connected to the upper wall of the buffer chamber 9, and a gap 29 is formed between the lower end of the manifold 28 and the lower wall of the buffer chamber 9. An annular chamber flow-gathering structure is formed on the outer periphery of the connecting pipe 11 through the manifold 28. The lower end of the manifold 28 extends to the lower side of the through hole 27. The latex collected in the manifold 28 can accumulate in the manifold 28 and rise upward in the flow-gathering process to form a high liquid level.

[0051] Several air guide holes 30 are opened in the upper part of the buffer chamber 9 corresponding to the manifold 28. The air guide holes 30 are connected to the manifold 28. Through the negative pressure adsorption in the air guide holes 30, the latex at the bottom of the buffer chamber 9 can be drawn into the manifold 28, which facilitates the return of the foamed latex from the through hole 27 to the connecting pipe 11, realizing the recycling of latex. An air guide cover 31 is provided on the top of the buffer box 8. The air guide cover 31 covers each air guide hole 30. An air guide pipe 32 is connected to the outside of the air guide cover 31. The air guide pipe 32 can more smoothly draw out the gas in the manifold 28, which is convenient for maintaining pressure.

[0052] A floating ring 33 is installed inside the manifold 28. The floating ring 33 is sleeved between the connecting pipe 11 and the manifold 28 and can be adjusted up and down. The floating ring 33 is sleeved between the connecting pipe 11 and the manifold 28 and is connected to the outer circumference of the connecting pipe 11 and the inner circumference of the manifold 28 in a sealing piston-like connection. When air is drawn from the air guide hole 30 at the upper end of the manifold 28, the floating ring 33 moves up and down. The piston-like structure can more smoothly draw the latex at the bottom of the manifold 28 upward, which is conducive to the accumulation of latex and makes the latex recycling flow more smoothly.

[0053] Furthermore, further design can be carried out based on the above, and the structure of the floating ring 33 can be adjusted, such as... Figure 5 As shown, several vertically penetrating balance holes 34 are formed on the floating ring 33, and a sealing sheet 35 is elastically covered on the upper surface of the floating ring 33. Under the automatic elastic action of the sealing sheet 35, the sealing sheet 35 will elastically cover the upper side of the balance hole 34 downward, which can realize the opening and closing of the balance hole 34.

[0054] When the sealing sheet 35 is subjected to downward adsorption, it will adhere tightly to the balance hole 34, keeping the balance hole 34 closed. When the sealing sheet 35 is subjected to upward force exceeding a certain limit, it will elastically swing up and down, opening the balance hole 34. The opening and closing of the balance hole 34 can then be switched by adjustment.

[0055] The retaining ring 36 protrudes upward relative to the sealing plate 35, so that when the floating ring 33 is adjusted to the uppermost position, the retaining ring 36 and the upper side wall of the buffer chamber 9 press against each other, so that the sealing plate 35 has a certain space to swing upward, and the balance hole 34 can still be opened; that is, when the piston floats up to the uppermost position, it can still be adsorbed by increasing the negative pressure of the air guide tube 32, and then the sealing plate 35 can continue to be opened, so that more latex can be adsorbed in the manifold 28, thereby further improving the latex aggregation in the manifold 28, which is conducive to latex aggregation and utilization.

[0056] This embodiment also discloses a natural latex molding die system that can reduce overflow. The die system includes the aforementioned natural latex molding die, a support platform 15, and several pressure rods 16. The support platform 15 is used to support the natural latex molding die. The pressure rods 16 can press the buffer box 8 onto the upper die 2, and the latex is injected into the mold cavity 3 through the buffer box 8, thereby realizing the molding of latex products.

[0057] This embodiment also discloses a natural latex molding process that reduces overflow, using the aforementioned natural latex molding mold for molding production. When using this molding mold, as... Figure 2As shown, the lower mold 1 is placed on the support platform 15, and the upper mold 2 and the lower mold 1 are fitted together. The buffer box 8 is installed on the upper part of the upper mold 2. The connecting pipe 11 between the buffer box 8 and the upper mold 2 is connected to the injection pipe 5, and the buffer pipe 10 is connected to the overflow pipe 7. The buffer box 8 is pressed down on the upper part by the pressure rod 16, thereby realizing the assembly between the buffer box 8 and the mold. The pressure rod 16 can be a telescopic pneumatic rod 16 or a hydraulic rod 16.

[0058] Latex is injected into the upper part of the connecting pipe 11, and then injected into the mold cavity 3 through the connecting pipe 11 and the injection pipe 5 until the mold cavity 3 is filled with latex. During the process of filling the mold cavity 3, some latex overflows upward from the overflow pipe 7 at the upper part of the upper mold 2. The overflowing latex flows into the buffer cavity 9 through the buffer pipe 10, forming a pool of overflowing latex in the buffer cavity 9. As the latex continues to accumulate in the buffer cavity 9, it can form a pool of latex that can be reused. The pooled latex can then flow unidirectionally from the through hole 27 of the connecting pipe 11 back into the interior of the connecting pipe 11, realizing the recycling of latex and reducing latex waste.

[0059] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A natural rubber forming mold capable of reducing overflow, characterized by comprising: It includes upper die (2) and lower die (1), the upper die (2) and lower die (1) enclose the die cavity (3), the upper die (2) is provided with gate (4) and several overflow holes (6), the upper part of the gate (4) is connected with injection tube (5), the upper part of overflow hole (6) is connected with overflow pipe (7); It also includes buffer tank (8) with buffer cavity (9) inside, the buffer tank (8) has connecting pipe (11) and several buffer pipes (10), the buffer pipe (10) extends into the buffer cavity (9) from the lower part of the buffer tank (8), and corresponds to the overflow pipe (7), the lower end of the buffer pipe (10) is used for communication with the overflow pipe (7), the upper end communicates with the buffer cavity (9), and the latex overflowing from the overflow pipe (7) is introduced into the buffer cavity (9); the connecting pipe (11) penetrates the buffer tank (8) from top to bottom, the upper end is used for latex injection, and the lower end is connected with the injection tube (5) of the upper die (2), the connecting pipe (11) is provided with through hole one (27) at the position of the side wall extending into the buffer cavity (9), and the through hole one (27) is used for guiding the latex in the buffer cavity (9) into the connecting pipe (11). The upper end of the buffer pipe (10) extends into the buffer cavity (9), and a plurality of through hole two (22) are formed at the end extending into the buffer cavity (9), so as to communicate the inner cavity of the buffer pipe (10) and the buffer cavity (9); The inner periphery of the connecting pipe (11) is provided with inwardly protruding convex ring (23) on the lower side, the upper and lower sides of the convex ring (23) are tapered, the convex ring (23) forms the necking (24) with the upper and lower ends gradually narrowing in the middle, and the through hole one (27) is formed at the outer periphery position of the necking (24), so as to communicate the inner periphery of the connecting pipe (11) and the buffer cavity (9). The through hole one (27) is inclined downward to the inner periphery of the necking (24), and a one-way valve structure is arranged in the through hole one (27) to guide the latex in the buffer cavity (9) to the inner periphery of the necking (24) in one direction.

2. The natural rubber forming mold capable of reducing overflow according to claim 1, wherein The upper end of the overflow pipe (7) is provided with tapered surface two (20), the lower end of the buffer pipe (10) is provided with sealing sleeve (18), the lower end of the sealing sleeve (18) is provided with tapered surface one (19), the sealing sleeve (18) can be sleeved on the upper end of the overflow pipe (7), the tapered surface one (19) and the tapered surface two (20) are matched to realize sealing.

3. The natural rubber forming mold capable of reducing overflow according to claim 2, wherein The inner periphery of the buffer pipe (10) is provided with annular limiting groove one (17) for accommodating the sealing sleeve (18), the sealing sleeve (18) is connected to the limiting groove one (17) and can be adjusted up and down, the upper end surface of the sealing sleeve (18) is elastically pressed against the upper end surface of the limiting groove one (17) by spring one (21), and the spring one (21) is used to elastically press the limiting sealing sleeve (18) downward.

4. The natural rubber forming mold capable of reducing overflow according to claim 1, wherein The connecting pipe (11) is located at the middle position of the buffer tank (8), the bottom of the buffer cavity (9) in the buffer tank (8) is inclined surface (14), the side of the inclined surface (14) inclined downward to the connecting pipe (11), and the latex overflowing into the buffer cavity (9) can be guided to the connecting pipe (11) through the inclined surface (14).

5. The natural rubber forming mold capable of reducing overflow according to claim 4, wherein The lower side of the necking (24) is a tapered surface three (25), the upper end of the injection tube (5) is a tapered surface four (26), the tapered surface three (25) and the tapered surface four (26) are matched with each other, and the sleeve sealing can be realized.

6. The natural rubber forming mold capable of reducing overflow according to claim 1, wherein The buffer cavity (9) is provided with a flow collecting barrel (28) corresponding to the outer periphery of the connecting pipe (11), the upper end of the flow collecting barrel (28) is fixedly connected with the upper wall of the buffer cavity (9), and the lower end of the flow collecting barrel (28) is spaced apart from the lower wall of the buffer cavity (9) to form a gap (29); the lower end of the flow collecting barrel (28) extends to the lower side of the through hole one (27); the buffer cavity (9) is provided with a plurality of air guide holes (30) corresponding to the upper position of the flow collecting barrel (28), and the air guide holes (30) are used for communicating the flow collecting barrel (28).

7. The natural rubber forming mold capable of reducing overflow according to claim 6, wherein The flow collecting barrel (28) is provided with a floating ring (33), the floating ring (33) is sleeved between the connecting pipe (11) and the flow collecting barrel (28) and can be adjusted up and down; the cover of the buffer box (8) is provided with an air guide cover (31), the air guide cover (31) covers the air guide holes (30) inside, and the outer side of the air guide cover (31) is connected with an air guide pipe (32); the floating ring (33) is sleeved between the connecting pipe (11) and the flow collecting barrel (28) and is in sealed piston connection with the outer periphery of the connecting pipe (11) and the inner periphery of the flow collecting barrel (28).

8. A natural rubber latex molding process characterized by, The natural latex forming mold is processed by adopting any one of claims 1-7, in the forming process, the lower mold (1) is placed on the support table (15), the upper mold (2) and the lower mold (1) are covered with each other, the buffer box (8) is installed on the upper part of the upper mold (2), and the connecting pipe (11) between the buffer box (8) and the upper mold (2) is connected with the injection pipe (5), the buffer pipe (10) and the overflow pipe (7); the buffer box (8) is compressed by the compression rod (16) at the upper part of the buffer box (8), so as to realize the assembly between the buffer box (8) and the mold; The latex is injected from the upper part of the connecting pipe (11), injected into the mold cavity (3) through the connecting pipe (11) and the injection pipe (5), and filled in the mold cavity (3); in the process of filling the latex, part of the latex overflows upward from the overflow pipe (7) at the upper part of the upper mold (2), the overflowed latex flows into the buffer cavity (9) through the buffer pipe (10), and the overflowed latex is collected in the buffer cavity (9); the collected latex can be reused and unidirectionally flows to the inside of the connecting pipe (11) from the through hole one (27) of the connecting pipe (11), so as to realize the recycling of the latex.

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