CN115742150A - Natural latex forming die capable of reducing overflow and forming process - Google Patents

Abstract

The invention discloses a natural latex molding die and molding process capable of reducing overflow, relates to the technical field of latex molding, and aims to solve the overflow and various defects in the molding process of current latex products, and its technical solution The main points are: including an upper mold and a lower mold, the upper mold and the lower mold are enclosed to form a mold cavity, the upper mold is provided with a sprue and a number of overflow holes, the upper part of the sprue is connected to the injection pipe, and the overflow hole The upper part is connected to the overflow pipe; it also includes a buffer box with a buffer chamber inside. The buffer box has a connecting pipe and several buffer pipes. One-to-one correspondence, the invention reduces the overflow waste of latex molding, maintains the integrity of the product surface in the flow channel, and improves the surface quality of latex product molding.

Description

A natural latex molding die and molding process capable of reducing overflow

technical field

The invention relates to the technical field of latex, more specifically, it relates to a natural latex forming mold capable of reducing overflow, and also relates to a natural latex forming process.

Background technique

Natural latex is tapped from rubber trees to obtain latex raw materials. The natural latex collagen solution is processed through latex processing technology, and concentrated latex with a solid content of more than 60% is obtained by centrifugation or evaporation. Then through the latex molding process, the latex is foamed to form a sponge-like product. The processed product has the advantages of natural latex and can be made into latex latex mattresses, latex pillows, latex bras and other products. .

In the production process of latex products, foaming treatment is required to form a foamed structure filled with tiny bubbles inside. During the molding process, the foamed latex is injected into the mold and solidified through the molding process. However, in the process of injecting latex into the mold, in order to fill the mold with latex and completely discharge the internal air, it is necessary to inject foamed latex larger than the volume of the cavity into the mold. Excessive latex will form a large amount of overflow on the mold, resulting in A large amount of waste of latex raw materials; and the spilled latex is scattered outside the mold, which will also cause pollution to the latex production environment.

Especially for small pieces of latex products, such as coasters for latex bras, due to the small size of the product, the amount of overflow in each production is basically fixed, resulting in the proportion of the amount of latex spilled relative to the actual amount of latex products required. Greatly increased, that is, the proportion of waste of latex will be greater.

Therefore, a new solution needs to be proposed to solve this problem.

Contents of the invention

The object of the present invention is to solve the above problems and provide a natural latex forming mold that can reduce overflow, which can buffer the latex overflowed during the latex forming process, reduce the waste of overflowing latex, and optimize the latex delivery flow path.

The above-mentioned technical purpose of the present invention is achieved by the following technical scheme: a kind of natural latex forming mold that can reduce overflow, comprises upper mold and lower mold, and described upper mold and lower mold encircle and form mold cavity, and described upper mold A sprue and a number of overflow holes are set on the top, the upper part of the sprue is connected to the injection pipe, and the upper part of the overflow hole is connected to the overflow pipe; it also includes a buffer box with a buffer chamber inside, and the buffer tank has a connecting pipe and several buffers. The buffer tube extends into the buffer chamber from the lower part of the buffer tank, and corresponds to the overflow pipe one by one. The latex overflowed from the tube is introduced into the buffer chamber; the connecting pipe runs through the buffer box up and down, the upper end is used for latex injection, and the lower end is used to connect with the injection pipe of the upper mold, and the connecting pipe extends into the side wall of the buffer chamber to open a through hole One, said through hole one is used to guide the latex in the buffer chamber into the connecting pipe.

The present invention is further provided that the outer circumference of the upper end of the overflow pipe is the second cone, the inner circumference of the lower end of the buffer tube is provided with a sealing sleeve, the inner circumference of the lower end of the sealing sleeve is the first cone, and the sealing sleeve can be sleeved on the overflow At the upper end of the tube, the first cone surface and the second cone surface are adapted to each other to achieve sealing.

The present invention is further provided that the inner circumference of the buffer tube is provided with an annular limiting groove 1 for accommodating the sealing sleeve, and the piston of the sealing sleeve is connected in the limiting groove 1 and can be adjusted up and down. The sealing sleeve Spring 1 is elastically pressed between the upper end surface of the upper end surface of the locating groove 1 and the upper end surface of the limiting groove 1, and the spring 1 is used to elastically press down and limit the sealing sleeve.

The present invention is further provided that the upper end of the buffer tube extends into the buffer cavity, and one end extending into the buffer cavity is provided with a plurality of through holes 2, through which the inner cavity of the buffer tube and the buffer cavity are connected.

The present invention is further provided that the connecting pipe is located in the middle of the buffer box, the bottom of the buffer chamber in the buffer box is an inclined plane, and the inclined plane slopes down towards one side of the connecting pipe, and the latex overflowing into the buffer chamber can be passed through the inclined plane Direct the flow in the direction of the connecting pipe.

The present invention is further configured as follows: a protruding ring protruding inward is provided on the lower side of the inner circumference of the connecting pipe, the upper and lower sides of the protruding ring are both tapered, and the protruding ring forms a constriction at the upper and lower ends that gradually shrinks in the middle. Mouth; the outer peripheral position of the necking opening is provided with a through hole one, and the through hole one communicates with the inner circumference of the connecting pipe and the buffer chamber.

The present invention is further provided that the position of the lower side of the constriction is the third cone, the outer peripheral position of the upper end of the injection tube is the fourth cone, and the third and fourth cones are matched with each other to realize the sealing of the sleeve. Rubber sealing rings can be installed at four places of the conical surface of the injection pipe to realize the sealing performance when the three conical surfaces and the four conical surfaces are mutually fitted.

The present invention is further provided that a confluence cylinder is provided in the buffer chamber corresponding to the outer circumference of the connecting pipe, the upper end of the confluence cylinder is fixedly connected to the upper wall of the buffer chamber, and a gap is formed between the lower end of the confluence cylinder and the lower wall of the buffer chamber; The lower end of the manifold extends to the lower side of the first through hole; the buffer cavity is provided with a number of air guide holes corresponding to the upper position of the manifold, and the air guide holes are used to communicate with the manifold.

The present invention is further configured as follows: a floating ring is set inside the confluence cylinder, and the floating ring is sleeved between the connecting pipe and the confluence cylinder, and can realize floating adjustment up and down; The air cover sets each air guide hole cover inside, and the outside of the air guide cover is connected with an air guide tube. And a solenoid valve is installed on the air guide tube.

The present invention is further provided that the floating ring is sleeved between the connecting pipe and the confluence cylinder, and is connected with the outer circumference of the connection pipe and the inner circumference of the confluence cylinder with sealed pistons; Install the solenoid valve.

The present invention is further provided that the floating ring is provided with several balance holes penetrating up and down, and the upper end surface of the floating ring is elastically covered with a sealing sheet, and the sealing sheet is used to elastically cover the upper side of the balance hole, so that the balance hole can be realized. Opening and closing: the outer periphery of the upper end of the balance hole is fixedly connected with a retaining ring, the outer periphery of the sealing sheet is connected to the retaining ring, and the inner periphery of the retaining ring can elastically swing up and down to realize the opening and closing switch of the balance hole.

The present invention is further provided that the first through hole is inclined downward toward the inner circumference of the neck, and the first through hole is provided with a one-way valve structure for unidirectional conduction toward the inner circumference of the neck; the one-way valve structure includes A connecting block, a stopper and an elastic retaining piece, the connecting block is fixedly connected to the upper side of the through hole one, the stopper is fixedly connected to the lower side of the through hole one, and the upper edge of the elastic retaining piece is fixedly connected to the The connecting block and the lower edge of the elastic blocking piece are used to press against the blocking block to realize sealing; the elastic blocking piece can elastically swing in the direction of the inner circumference of the shrinkage in the first through hole, so as to realize the opening of the through hole one.

The invention also discloses a natural latex forming process capable of reducing overflow, which is characterized in that the above-mentioned natural latex forming mold is used for processing. and install the buffer box on the upper part of the upper mold, connect the connection pipe between the buffer box and the upper mold with the injection pipe, the buffer pipe and the overflow pipe; Realize the assembly between the buffer box and the mold; inject latex from the upper part of the connecting pipe, and inject it into the mold cavity through the connecting pipe and injection pipe until the mold cavity is filled with latex; during the process of latex filling, part of the latex overflows from the upper part of the upper mold The flow tube overflows upwards, and the overflowed latex flows into the buffer chamber through the buffer tube, where the overflowed latex is collected; the collected latex can be reused, and then flows unidirectionally from the through hole of the connecting pipe to the inside of the connecting pipe , Realize the recycling of latex.

In summary, the present invention has the following beneficial effects:

By setting the buffer box, there is a one-to-one correspondence between the buffer pipe and the overflow pipe in the buffer box. During installation, the lower end of the buffer tube can be nested with the overflow tube to achieve communication, and the upper end can be connected to the buffer cavity. The latex overflowing from the overflow tube can be guided by the overflow tube and the buffer tube into the buffer cavity. Among them, the convergence of overflow latex in the buffer chamber is realized, thereby reducing the waste of latex overflow and improving the utilization rate of latex raw materials.

Description of drawings

Fig. 1 is a kind of structural representation of the natural latex molding die that can reduce overflow of the present invention;

Fig. 2 is the structural representation of a kind of natural latex forming mold system that can reduce overflow of the present invention;

Fig. 3 is the schematic diagram of the enlarged structure of the buffer pipe of the buffer tank of the present invention;

Fig. 4 is the enlarged structural representation of the connecting pipe of the buffer tank of the present invention;

Fig. 5 is the schematic diagram of the enlarged structure of the floating ring of the present invention;

Fig. 6 is a structural schematic diagram of the one-way valve structure of the through hole 1 of the present invention.

Reference signs: 1, lower mold; 2, upper mold; 3, mold cavity; 4, sprue; 5, injection pipe; 6, overflow hole; 7, overflow pipe; 8, buffer box; 9, buffer chamber ; 10, buffer pipe; 11, connecting pipe; 12, air outlet; 14, inclined plane; 15, support platform; 16, pressure rod; 17, limit groove one; Cone two; 21, spring one; 22, through hole two; 23, protruding ring; 24, necking; 25, cone three; 26, cone four; 27, through hole one; Gap; 30, air guide hole; 31, air guide cover; 32, air guide pipe; 33, floating ring; 34, balance hole; 35, sealing sheet; 36, retaining ring; 37, elastic pad; 38, connection block; 39, Stopper; 40, elastic stopper.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

This embodiment discloses a natural latex forming mold capable of reducing overflow, as shown in FIG. 1 , including 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 are surrounded to form a mold cavity 3, and the shape in the mold cavity 3 is the shape of the product to be produced , during the molding process, the latex is injected into the mold cavity 3 to obtain a product of the desired shape, and the corresponding product can be obtained through subsequent molding.

A sprue 4 is set on the upper part of the upper mold 2, and an overflow hole 6 is set on the outer side of the sprue 4, so that the latex can completely fill the mold cavity 3 during the process of injecting the latex into the mold cavity 3, so as to facilitate other gases in the mold cavity 3 discharge. The injection pipe 5 is connected on the top of the injection port 4, and latex can be conveniently injected into the mold cavity 3 from the upper end of the injection pipe 5. An overflow pipe 7 is connected to the top of the overflow hole 6, and the overflow pipe 7 can cooperate with the buffer box 8 so that the air in the mold cavity 3 can flow out and collect the overflowing latex. Both the injection pipe 5 and the overflow pipe 7 are in the structure of protruding upwards, and can form a state of mutual cooperation with the buffer tank 8 .

The buffer box 8 and the upper part of the upper mold 2 are adapted to each other, and the inner cavity of the buffer box 8 is hollow to form a structure of the buffer chamber 9; a connecting pipe 11 and several buffer pipes 10 are installed at the lower position of the buffer box 8, wherein the connecting pipe 11 and The injection pipes 5 are adapted to each other, and each buffer pipe 10 and each overflow pipe 7 are adapted one by one, so that the assembly between the buffer box 8 and the upper mold 2 can be realized.

This connecting pipe 11 runs through the buffer tank 8 up and down, and the upper end can be connected with the injection pipeline of latex, and latex can be introduced; Socketed with each other to realize the mutual connection and sealing between the injection pipe 5 and the connecting pipe 11 .

The buffer pipe 10 extends into the buffer chamber 9 from the bottom of the buffer tank 8 , can penetrate the lower side wall of the buffer chamber 9 up and down, and the buffer pipe 10 corresponds to the overflow pipe 7 one by one. When the buffer box 8 is installed, the lower end of the buffer pipe 10 can be nested with the overflow pipe 7 to realize communication, and the upper end can be connected to the buffer chamber 9 . The latex overflowing from the overflow pipe 7 can pass through the guide of the overflow pipe 7 and the buffer pipe 10 into the buffer chamber 9, so as to realize the convergence of the overflow latex in the buffer chamber 9, thereby reducing the overflow of latex and improving the quality of the latex. Raw material utilization.

Further, a through-hole 27 can be set at the side wall position where the connecting pipe 11 extends into the buffer chamber 9, and the through-hole 127 can introduce the latex in the buffer chamber 9 into the connecting pipe 11, and the overflow of the remaining in the buffer chamber 9 The latex in the buffer cavity 9 can be utilized in the connecting pipe 11 .

When the molding die is in use, as shown in Figure 2, the lower mold 1 is placed on the support platform 15, the upper mold 2 and the lower mold 1 are mutually covered, and the buffer box 8 is installed on the top of the upper mold 2, and the buffer The connection pipe 11 between the box 8 and the upper mold 2 is connected with the injection pipe 5, the buffer pipe 10 and the overflow pipe 7; the upper part of the buffer box 8 is pressed by the pressure rod 16, and then the buffer box 8 and the mold are connected. room assembly. Depression bar 16 can adopt telescopic air pressure bar 16 or hydraulic bar 16.

The upper part of the connecting pipe 11 is injected with latex, and 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 latex, part of the latex flows upward from the overflow pipe 7 on the upper part of the upper mold 2 Overflow, the overflowing latex flows into the buffer chamber 9 through the buffer tube 10, and forms a pool of overflowing latex in the buffer chamber 9. Along with the continuous accumulation of latex in the buffer chamber 9, a collection of latex can be formed in the buffer chamber 9, and the collected latex can be reused, and then flow unidirectionally from the through hole-27 of the connecting pipe 11 to the inside of the connecting pipe 11, Realize the recycling of latex and reduce the waste of latex.

In order to facilitate the connection and adaptation between the overflow pipe 7 and the buffer pipe 10 and improve the stable state after assembly, several elastic pads 37 can be installed at the bottom of the buffer box 8, and the elastic pads 37 can play the role of elastic buffering; furthermore, When the buffer box 8 is installed, the support stability between the buffer box 8 and the upper mold 2 is improved.

As shown in Figure 3, the outer periphery of the upper end of the overflow pipe 7 is a conical surface 2 20, and the inner periphery of the lower end of the buffer pipe 10 is equipped with a sealing sleeve 18, and the inner circumference of the lower end of the sealing sleeve 18 is a conical surface 19, and the conical surface 19 and The two cones 20 are hermetically adapted to each other. The sealing sleeve 18 can be sleeved on the upper end of the overflow pipe 7, and the first cone surface 19 and the second cone surface 20 are compatible with each other, so that the sealing of the sleeve can be realized, and the sealing effect after the two sleeves can be maintained. The sealing sleeve 18 can be made of an elastic sealing material. After being assembled, the upper end of the sealing sleeve 18 and the overflow pipe 7 can be pressed against each other, and the mutual sealing between the two can be maintained by pressure.

Further, the sealing sleeve 18 can adopt a structure that floats up and down, and an annular limiting groove 17 is provided on the inner periphery of the buffer tube 10, and the sealing sleeve 18 can be accommodated through the limiting groove 17, and the sealing sleeve 18 is placed in the limiting groove. A state that can elastically float up and down is formed within 17. Furthermore, when each overflow pipe 7 is in a position with different heights, it is possible to maintain a stable sealing state between the buffer pipe 10 and the overflow pipe 7 .

A piston connection state is formed between the outer circumference of the sealing sleeve 18 and the inner wall of the limiting groove 17, which can realize the adjustment of the upper and lower pistons. A spring 21 is installed between the upper end surface of the sealing sleeve 18 and the upper end surface of the limiting groove 17, the sealing sleeve 18 can be elastically pressed downward by the spring 21, and the sealing sleeve 18 can be elastically pushed downward by the spring 21 ; When the overflow tube 7 is inserted into the buffer tube 10, the stable sealing state between the overflow tube 7 and the buffer tube 10 can be maintained.

The upper end of the buffer tube 10 stretches into the buffer chamber 9, and a number of through holes 22 are provided at the end position extending into the buffer chamber 9, through which the inner chamber of the buffer pipe 10 and the buffer chamber 9 can be communicated, and then the The latex overflowing from the buffer tube 10 flows into the buffer chamber 9 to realize the convergence of the latex in the buffer chamber 9 . The upper end of the buffer tube 10 can be pressed against and connected to the upper side wall of the buffer chamber 9 , thereby forming a support structure between the upper and lower side walls of the buffer chamber 9 to increase the strength of the entire buffer box 8 .

A number of air outlets 12 can be provided on the upper part of the buffer box 8, and the air pressure balance of the buffer chamber 9 can be maintained through the air outlets 12, so that the latex can flow smoothly in the mold cavity 3 and overflow smoothly in the buffer chamber 9 . Further, a solenoid valve can be installed at the gas outlet 12 at the gas outlet 12, and the on-off of the gas outlet 12 can be controlled by the solenoid valve, so that the latex circulation can be actively controlled.

As shown in Figure 4, an inwardly protruding convex ring 23 is formed on the inner periphery of the connecting pipe 11 near the lower side. The shrinkage 24 gradually shrinks, and the shrinkage 24 has a funnel-shaped structure. A through hole 27 is provided on the outer periphery of the constriction 24, and the through hole 27 communicates with the inner circumference of the connecting pipe 11 and the buffer chamber 9. Through the through hole 127, the latex overflowing from the buffer chamber 9 can be sucked into the connecting pipe 11 again. , and then realize the reuse of spilled latex.

Because the constriction 24 is a structure in which both ends are enlarged and the middle is narrowed, the latex will exhibit a Venturi adsorption structure at the constriction 24 during the transportation process in the connecting pipe 11, and it can flow through the flow channel in the connecting pipe 11 at a relatively high speed. The pressure at the port 24 will decrease, and an adsorption force will be generated at the first through hole 27, so that the overflow latex accumulated in the buffer chamber 9 can be reused. Through the effect of negative pressure adsorption, the latex overflowing in the buffer chamber 9 can be recycled, which improves the utilization rate of the latex and has good convenience.

Further, the structure of the first through hole 27 can be further optimized, so that the latex in the buffer chamber 9 can flow into the connecting pipe 11 more smoothly. As shown in Figure 6, the through hole one 27 is inclined downward toward the inner circumference of the necking mouth 24, and a one-way valve structure is provided in the through hole one 27 to the inner circumference of the necking mouth 24; The one-way valve structure enables the latex to flow in one direction from the buffer chamber 9 to the constriction 24 of the connecting pipe 11, preventing the latex in the connecting pipe 11 from being squeezed into the buffer chamber 9 in reverse.

As shown in Figure 6, the one-way valve structure includes a connecting block 38, a stopper 39 and an elastic retainer 40, wherein the connecting block 38 is fixedly connected to the upper side of the through hole 27, and the stopper 39 is fixedly connected to the through hole one. 27, the upper edge of the elastic retainer 40 is fixedly connected to the connection block 38, and the lower edge of the elastic retainer 40 is used to press against the block 39 to achieve sealing; the elastic retainer 40 is on the upper side The connecting piece of the connecting piece is connected, and the stopper 39 on the lower side realizes the activity. Under the self-elasticity of the elastic catch 40, it can automatically elastically press against the stopper direction to realize the closing of the through hole 27; when the through hole 27 When the suction force toward the necking 24 is generated, the elastic retainer 40 can elastically swing toward the necking 24 to realize the opening of the through hole 27, and the latex can flow smoothly to the necking 24, thereby realizing the smooth flow of latex.

Further, the lower side of the constriction 24 is located at the third cone 25, and the outer peripheral position of the upper end of the injection tube 5 is located at the fourth cone 26, and the third cone 25 and the fourth cone 26 are compatible with each other to achieve a packaged seal. In order to keep the stable state of the two when assembling, a rubber sealing ring can be installed at the cone surface 26 of the injection pipe 5, so as to realize the sealing performance when the cone surface 3 25 and the cone surface 4 26 are mutually fitted.

As shown in FIG. 1 , in order for the latex to converge smoothly in the buffer chamber 9 , the connecting pipe 11 can be located in the middle of the buffer tank 8 , and the bottom of the buffer chamber 9 in the buffer tank 8 is an inclined plane 14 . The inclined surface 14 slopes down towards one side of the connecting pipe 11, and the latex overflowing into the buffer chamber 9 can be directed toward the connecting pipe 11 through the inclined surface 14, so that the latex can accumulate in the buffer chamber 9 and gather in the connecting pipe 11 The outer peripheral position is convenient for the converged latex to flow back smoothly from the through hole 27, and is convenient for reusing the overflow latex.

Further, the latex return structure in the buffer chamber 9 can be further optimized. As shown in Figures 1 and 4, a confluence sleeve 28 can be provided in the buffer chamber 9 corresponding to the outer circumference of the connecting pipe 11, and the upper end of the confluence sleeve 28 is fixed Connecting the upper wall of the buffer chamber 9 , a gap 29 is formed between the lower end of the manifold 28 and the lower wall of the buffer chamber 9 . A ring-shaped cavity confluence structure is formed at the outer peripheral position of the connecting pipe 11 by the confluence cylinder 28. The lower end of the confluence cylinder 28 extends to the lower side of the through hole one 27, and the latex gathered in the confluence cylinder 28 can be gathered in the confluence cylinder 28, And gather upward in the confluence to form a higher liquid level.

A number of air guide holes 30 are provided at the upper position 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 sucked into the manifold 28. Furthermore, it is beneficial for the foamed latex to flow back into the connecting pipe 11 from the first through hole 27, so as to realize latex recycling. The cover on the buffer box 8 is provided with an air guide cover 31, and the air guide cover 31 covers each air guide hole 30 inside, and the outside of the air guide cover 31 is connected with an air guide tube 32, by which the air guide tube 32 can be more smoothly. The gas in the manifold 28 is sucked out to facilitate pressure maintenance.

A floating ring 33 is installed in the manifold 28, and the floating ring 33 is sheathed 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 with the outer circumference of the connecting pipe 11 and the inner circumference of the manifold 28 with a sealing piston. The lifting and floating of 33 is reflected, and the piston-like structure can more smoothly suck the latex at the bottom of the confluence tube 28 upwards, which is beneficial to the accumulation of latex and makes the latex recovery and circulation smoother.

Further, further design can be carried out on the basis of the above, and the structure of the floating ring 33 is adjusted, as shown in Figure 5; on the floating ring 33, a number of balance holes 34 penetrating up and down are opened, and on the upper end surface of the floating ring 33 The elastic is covered with a sealing sheet 35 . Under the automatic elastic effect of the sealing sheet 35 , the sealing sheet 35 will elastically cover the upper side of the balance hole 34 downward, so that the opening and closing of the balance hole 34 can be realized.

When the sealing sheet 35 is subjected to downward adsorption, the sealing sheet 35 will be closely attached to the balance hole 34 to keep the balance hole 34 closed. When the sealing sheet 35 is subjected to an upward force and the strength exceeds a certain limit, the sealing sheet 35 will elastically swing up and down to realize the opening of the balance hole 34, and then the opening and closing switching of the balance hole 34 can be realized through adjustment.

The baffle ring 36 forms a certain upward protrusion relative to the sealing sheet 35, so that when the floating ring 33 is adjusted to the uppermost position, the baffle ring 36 and the upper side wall of the buffer chamber 9 press against each other, so that the sealing sheet 35 has a certain upward swing. space, so that the balance hole 34 can still be opened; that is, when the piston floats up to the uppermost position, it can still continue to open the sealing sheet 35 by increasing the negative pressure adsorption of the air duct 32, and can be in the middle of the manifold 28. More latex is absorbed, thereby further increasing the convergence of latex in the confluence barrel 28, which is beneficial to the convergence and utilization of latex.

Present embodiment also discloses a kind of natural latex forming mold system that can reduce overflow, and this mold system comprises above-mentioned natural latex forming mold and supporting platform 15, some pressure bars 16, and above-mentioned supporting platform 15 is used for supporting natural latex forming mold, by The pressure rod 16 can press-fit the buffer box 8 on the upper mold 2, and inject the latex into the mold cavity 3 through the buffer box 8, so that latex product molding can be realized.

This embodiment also discloses a natural latex molding process that can reduce overflow. The above-mentioned natural latex molding mold is used for molding production. When the molding mold is in use, as shown in Figure 2, the lower mold 1 is placed on the supporting platform 15, Cover the upper mold 2 and the lower mold 1 with each other, install the buffer box 8 on the upper part of the upper mold 2, connect the connecting pipe 11 between the buffer box 8 and the upper mold 2 with the injection pipe 5, the buffer pipe 10 and the overflow The pipes 7 are connected; the upper part of the buffer box 8 is pressed by the pressure rod 16, and then the assembly between the buffer box 8 and the mold is realized. Depression bar 16 can adopt telescopic air pressure bar 16 or hydraulic bar 16.

The upper part of the connecting pipe 11 is injected with latex, and 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 latex, part of the latex flows upward from the overflow pipe 7 on the upper part of the upper mold 2 Overflow, the overflowing latex flows into the buffer chamber 9 through the buffer tube 10, and forms a pool of overflowing latex in the buffer chamber 9. Along with the continuous accumulation of latex in the buffer chamber 9, a collection of latex can be formed in the buffer chamber 9, and the collected latex can be reused, and then flow unidirectionally from the through hole-27 of the connecting pipe 11 to the inside of the connecting pipe 11, Realize the recycling of latex and reduce the waste of latex.

The above descriptions are only preferred implementations of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions under the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those skilled in the art, some improvements and modifications without departing from the principles of the present invention should also be regarded as the protection scope of the present invention.

Claims (10)

1. The natural latex forming die capable of reducing overflow is characterized by comprising an upper die (2) and a lower die (1), wherein the upper die (2) and the lower die (1) surround to form a die cavity (3), the upper die (2) is provided with a sprue gate (4) and a plurality of overflow holes (6), the upper part of the sprue gate (4) is connected with a sprue pipe (5), and the upper parts of the overflow holes (6) are connected with overflow pipes (7);

the buffer box is characterized by further comprising a buffer box (8) internally provided with a buffer cavity (9), wherein the buffer box (8) is provided with a connecting pipe (11) and a plurality of buffer pipes (10), the buffer pipes (10) extend into the buffer cavity (9) from the lower part of the buffer box (8) and correspond to the overflow pipes (7) one by one, the lower ends of the buffer pipes (10) are communicated with the overflow pipes (7), and the upper ends of the buffer pipes are communicated with the buffer cavity (9) and used for guiding latex overflowing from the overflow pipes (7) into the buffer cavity (9); run through baffle-box (8) from top to bottom in connecting pipe (11), the upper end is used for the latex to inject into, and the lower extreme is used for being connected with notes pipe (5) of last mould (2), through-hole (27) are seted up to the lateral wall position that connecting pipe (11) stretched into cushion chamber (9), through-hole (27) are used for leading-in connecting pipe (11) with the latex in cushion chamber (9) in.

2. The natural rubber latex forming die capable of reducing overflow according to claim 1, wherein the outer periphery of the upper end of the overflow pipe (7) is a second conical surface (20), the inner periphery of the lower end of the buffer pipe (10) is provided with a sealing sleeve (18), the inner periphery of the lower end of the sealing sleeve (18) is a first conical surface (19), the sealing sleeve (18) can be sleeved on the upper end of the overflow pipe (7), and the first conical surface (19) and the second conical surface (20) are mutually matched to realize sealing.

3. The natural rubber latex forming die capable of reducing overflow according to claim 2, wherein an annular first limiting groove (17) for accommodating a sealing sleeve (18) is formed in the inner periphery of the buffer tube (10), the sealing sleeve (18) is connected in the first limiting groove (17) in a piston mode and can be adjusted up and down, a first spring (21) is elastically pressed between the upper end face of the sealing sleeve (18) and the upper end face of the first limiting groove (17), and the first spring (21) is used for elastically pressing and limiting the sealing sleeve (18) downwards.

4. The latex foam molding die capable of reducing the overflow as claimed in claim 2, wherein the upper end of the buffer tube (10) extends into the buffer chamber (9), and one end of the buffer tube extending into the buffer chamber (9) is provided with a plurality of second through holes (22), and the inner cavity of the buffer tube (10) and the buffer chamber (9) are communicated through the second through holes (22).

5. The latex forming die capable of reducing overflow according to claim 1, wherein the connecting pipe (11) is located at a middle position of the buffer tank (8), a bottom of the buffer chamber (9) in the buffer tank (8) is an inclined surface (14), the inclined surface (14) is inclined and descends towards one side of the connecting pipe (11), and the latex overflowing into the buffer chamber (9) can be guided towards the connecting pipe (11) by the inclined surface (14).

6. The natural rubber latex forming die capable of reducing the overflow according to claim 5, wherein a convex ring (23) protruding inwards is arranged on the lower side of the inner periphery of the connecting pipe (11), the upper side and the lower side of the convex ring (23) are both conical, and a necking (24) with large upper end and large lower end and gradually reduced middle is formed at the convex ring (23); a first through hole (27) is formed in the outer periphery of the necking opening (24), and the first through hole (27) is communicated with the inner periphery of the connecting pipe (11) and the buffer cavity (9).

7. The natural rubber latex forming die capable of reducing the overflow according to claim 5, wherein the lower side of the throat (24) is a tapered surface three (25), the outer peripheral position of the upper end of the injection tube (5) is a tapered surface four (26), and the tapered surface three (25) and the tapered surface four (26) are mutually matched to realize the nested sealing.

8. The natural rubber latex forming die capable of reducing overflow according to claim 1, wherein a confluence cylinder (28) is sleeved on the periphery of the buffer cavity (9) corresponding to the connecting pipe (11), the upper end of the confluence cylinder (28) is fixedly connected with the upper wall of the buffer cavity (9), and a gap (29) is formed between the lower end of the confluence cylinder (28) and the lower wall of the buffer cavity (9); the lower end of the confluence cylinder (28) extends to the lower side of the first through hole (27); the buffer cavity (9) is provided with a plurality of air guide holes (30) corresponding to the upper part of the confluence cylinder (28), and the air guide holes (30) are used for communicating the confluence cylinder (28).

9. The natural rubber latex forming die capable of reducing the overflow according to claim 8, wherein a floating ring (33) is arranged in the collecting cylinder (28), the floating ring (33) is sleeved between the connecting pipe (11) and the collecting cylinder (28), and the up-and-down floating adjustment can be realized; the buffer box (8) is covered with an air guide cover (31), each air guide hole (30) is covered by the air guide cover (31), 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 collecting cylinder (28) and is connected with the outer periphery of the connecting pipe (11) and the inner periphery of the collecting cylinder (28) in a sealing mode.

10. A natural latex forming process, characterized in that the natural latex forming mold according to any one of claims 1 to 9 is used for processing, when forming, the lower mold (1) is placed on the support table (15), the upper mold (2) and the lower mold (1) are mutually covered, the buffer tank (8) is arranged at the upper part of the upper mold (2), the connecting pipe (11) between the buffer tank (8) and the upper mold (2) is connected with the injection pipe (5), and the buffer pipe (10) is connected with the overflow pipe (7); the upper part of the buffer box (8) is tightly pressed through a pressure lever (16), so that the buffer box (8) is assembled with the die; injecting latex from the upper part of the connecting pipe (11), injecting the latex into the die cavity (3) through the connecting pipe (11) and the injection pipe (5) until the die cavity (3) is filled with the latex; in the process of latex filling, part of latex overflows upwards from an overflow pipe (7) at the upper part of the upper die (2), the overflowing latex flows into a buffer cavity (9) through a buffer pipe (10), and the overflowing latex is gathered in the buffer cavity (9); the collected latex can be recycled and flows to the inside of the connecting pipe (11) from the first through hole (27) of the connecting pipe (11) in a one-way mode, and recycling of the latex is achieved.

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