Lost foam mold

Abstract

The evanescent mode mold comprises an upper mold body and a lower mold body which form a closed cavity after being buckled, and an exhaust pipe communicated with the upper mold body is arranged on the inner wall of the upper mold body; a communicated feeding pipe is arranged on the inner wall of the upper die; the spherical cavity is communicated with the feeding pipe, a communicated steam pipe is arranged on the side wall of the spherical cavity, and the steam pipe coincides with the axis of the feeding pipe; the container is communicated with the spherical cavity through a pipeline, a second valve is arranged on the container, a first valve is arranged on the pipeline, the feeding pipe and the steam pipe both extend into the spherical cavity, the extending end of the steam pipe is sleeved with the feeding pipe, and a gap is formed between the outer side wall of the steam pipe and the inner side wall of the feeding pipe. According to the device, foam plastic particles can be mixed with steam when the steam is fed into the cavity, so that the foam plastic particles fed into the cavity can be randomly dispersed in the cavity, part of the foam plastic particles are attached to the inner wall of the cavity, accumulation of the foam plastic particles at the bottom of the cavity is reduced, and the foam plastic particles are heated and expanded more effectively by utilizing the steam; the forming speed of the evanescent mode is accelerated.

Description

Technical Field

[0001] The invention relates to the technical field of molds, and in particular to a lost foam mold. Background Art

[0002] The lost foam, also known as the foam white mold, is prepared by feeding the foam particles into the mold cavity through a switchable feed pipe, heating the cavity to expand the foam particles, and then cooling the cavity and demolding; The cavity is generally formed by the buckling of the upper die and the lower die, the lower die is a convex structure, and the upper die is a groove structure, such as Figure 1 As shown, a plurality of air holes 9 are generally provided on the top of the upper mold 1. When in use, the foam particles are first fed into the cavity, and steam is introduced into the box of the upper mold. The steam spreads into the cavity through the air holes 9 to heat the foam particles until the expanded foam particles fill the cavity to form a lost mold. The cavity is then cooled, and finally the lost mold is removed by demolding.

[0003] Since the foam particles are first fed into the cavity and accumulated at the bottom of the cavity, when the steam enters through the pores 9 and spreads downward, the foam particles located above will be heated and expanded in layers first, and the steam needs to continue to spread downward from the gaps between these expanded foam particles before it can heat the foam particles in the lower layer. Therefore, this type of lost foam mold requires a longer heating time when in use to allow the foam particles to fully expand. Summary of the invention

[0004] In order to solve the problems existing in the above technology, the present invention provides a lost foam mold, comprising an upper mold and a lower mold that can be buckled with each other, and the upper mold and the lower mold are buckled to form a closed cavity, including A connected exhaust pipe is arranged on the inner wall of the upper mold; A connected feeding pipe is arranged on the inner wall of the upper die; A spherical cavity connected to the feed pipe, a steam pipe connected to the spherical cavity is arranged on the side wall of the spherical cavity, and the steam pipe coincides with the axis of the feed pipe; A container, wherein the container is connected to the spherical cavity through a pipeline, a second valve is arranged on the container, a first valve is arranged on the pipeline, the feed pipe and the steam pipe both extend into the spherical cavity, the extending end of the steam pipe is sleeved in the feed pipe, and there is a gap between the outer wall of the steam pipe and the inner wall of the feed pipe.

[0005] Wherein, a part of the inner wall of the upper mold is formed by a slatted plate, and the slatted plate covers the inner end of the exhaust pipe.

[0006] Wherein, a cooling pipe is arranged in the slatted plate.

[0007] Wherein, the inner wall of the upper mold has an inclined surface, the top of the inclined surface is inclined toward the center of the upper mold, and the slatted plate is located on the inclined surface.

[0008] Wherein, the feed pipe is located below the slatted plate.

[0009] Wherein, a plurality of blowing nozzles are arranged in the exhaust pipe, the plurality of blowing nozzles are directly facing the slatted plate, and a pressure sensor is arranged on the inner wall of the upper mold.

[0010] The beneficial effects of the present invention are as follows: the present application can mix the foam particles with the steam when the steam is fed into the cavity through the feed pipe, the spherical cavity, the container, the steam pipe and the two valves, so that the foam particles fed into the cavity can be randomly dispersed in the cavity, and some of the foam particles are attached to the inner wall of the cavity, thereby reducing the accumulation of foam particles at the bottom of the cavity, more effectively utilizing the steam to heat and expand the foam particles, and accelerating the forming speed of the lost foam. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0012] Figure 1 It is a schematic diagram of the prior art of the present invention; Figure 2 It is a schematic diagram of the internal structure of the upper mold of the present invention; Figure 3 The present invention Figure 2 A magnified view of part A; Figure 4 It is a schematic diagram of the connection relationship between the steam pipe, the container, the feed pipe and the spherical cavity of the present invention.

[0013] Description of Reference Numerals 1. upper mold, 11. exhaust pipe, 12. slit plate, 13. gap, 14. prism, 2. lower mold, 3. blowing nozzle, 4. feeding pipe, 41. spherical cavity, 42. steam pipe, 5. container, 51. first valve, 52. second valve, 9. air hole. DETAILED DESCRIPTION

[0014] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0015] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0016] Specifically, Figures 2 to 4 As shown, a lost foam mold provided by an embodiment includes an upper mold 1 and a lower mold 2 that can be buckled with each other, and the upper mold 1 and the lower mold 2 are buckled to form a closed cavity, and a connected exhaust pipe 11 is provided on the inner wall of the upper mold 1; A connected feeding pipe 4 is provided on the inner wall of the upper mold 1; A spherical cavity 41 is connected to the feed pipe 4, and a steam pipe 42 is arranged on the side wall of the spherical cavity 41. The steam pipe 42 coincides with the axis of the feed pipe 4. It also includes a container 5 for containing foam particles. The container 5 is connected to the upper mold spherical cavity 41 through a pipeline. A second valve 52 is arranged on the upper mold container 5, and a first valve 51 is arranged on the upper mold pipeline. The upper mold feed pipe 4 and the upper mold steam pipe 42 both extend into the upper mold spherical cavity 41. The extending end of the upper mold steam pipe 42 is sleeved in the upper mold feed pipe 4, and there is a gap between the outer wall of the upper mold steam pipe 42 and the inner wall of the upper mold feed pipe 4.

[0017] When in use, first fill the container 5 with a certain amount of foam particles, close the first valve 51, and open the second valve 52. Figure 4 As shown, steam is fed into the feed pipe 4 through the steam pipe 42, and the steam is sprayed into the feed pipe 4 at a high speed. Figure 4Negative pressure is formed at point B in the middle, and a small amount of steam enters the cavity through the feed pipe 4 to preheat the cavity. Due to the low temperature of the inner wall of the cavity, a water film is attached. Then the first valve 51 is opened, and the foam particles in the container 5 are sucked into the feed pipe 4 through the negative pressure at point B to be mixed with the steam and preliminarily heated. Then the steam mixed with the foam particles enters the cavity. Since the steam is ejected at a certain speed, the foam particles are randomly dispersed in the cavity when sprayed, and due to the existence of the water film, the foam particles that first contact the inner wall of the cavity will adhere to it, reducing the accumulation of foam particles at the bottom of the cavity, and since the foam particles gradually enter the cavity with the steam, compared with the prior art, the foam particles falling on the bottom of the cavity can also better contact the steam, and the excess steam is discharged from the exhaust pipe 11. After all the foam particles are discharged from the container 5, the second valve 52 can be closed, and then a certain amount of steam continues to be introduced into the cavity, and then the steam input is closed, and the lost mold is formed.

[0018] Even though the foam particles have moisture attached to their surface when sprayed into the cavity and have a greater weight, some of the foam particles may still be discharged by the exhaust pipe 11 due to the high speed of steam spraying into the cavity. In order to solve this problem, a part of the inner wall of the upper mold 1 can be formed by a slit plate 12, and the upper mold slit plate 12 covers the inner end of the upper mold exhaust pipe 11. The gap 13 of the slit plate 12 should be smaller than the original size of the foam particles before they are heated and expanded. Specifically, the inner wall of the upper mold 1 has an inclined surface, and the top of the upper mold inclined surface is inclined toward the center of the upper mold 1, that is, Figure 2 The connecting portion between the side wall and the top wall of the middle upper mold 1, the slat plate 12 is located on the inclined surface.

[0019] Although the slit plate 12 can block the foam particles, if too many foam particles block the gap 13, the pressure in the cavity will be too high. Therefore, in order to solve this problem, a cooling pipe is provided in the upper mold slit plate 13, such as Figure 3 As shown, the cooling pipe passes through the prism 14, and cooling water circulates in the cooling pipe. When the foam particles mixed with steam enter the cavity, the prism 14 is cooled by the cooling pipe, and a small amount of condensed water continues to form on the side facing the inside of the cavity. The foam particles attached to the cooling pipe will fall with the condensed water to prevent the slit plate 12 from being blocked.

[0020] Since the steam delivered into the cavity is only at a faster speed but in a smaller amount, the pressure inside the cavity toward the gap 13 is not very high, and the slit plate 12 has an inclination angle of approximately 45 degrees. At the same time, the expanded foam particles have a larger volume and their surface can carry more water. Therefore, a small amount of condensed water from the slit plate 13 toward the inside of the cavity can bring down the attached foam particles.

[0021] When using the slit plate 12 with condensation function, intermittent air supply can also be used. When a certain amount of steam is introduced, some foam particles enter the mold cavity with the steam, and then the air supply is stopped. At this time, the gap 13 no longer has outward pressure. Wait for tens of seconds to allow the condensed water on the inside of the slit plate 13 to take away the attached foam particles, and then air can be supplied again. The first valve 51 should be closed before the air supply is interrupted.

[0022] In addition, preferably, the upper mold feed pipe 4 is located below the upper mold slit plate 13, and the steam ejection direction into the cavity should not be facing the slit plate 13. The steam ejection direction can be opposite to or perpendicular to the gas discharge direction from the exhaust pipe 11 and tilted downward.

[0023] As an additional measure, multiple blowing nozzles 3 can be arranged in the upper mold exhaust pipe 11. The multiple upper mold blowing nozzles 3 are opposite to the upper mold slit plate 12. A pressure sensor is arranged on the inner wall of the upper mold 1. If the gap 13 on the slit plate 12 is mostly blocked, the pressure in the cavity rises. When the pressure exceeds the threshold, the first valve 51 should be closed and the steam supply should be stopped. After the pressure in the cavity is slowly released, the nozzle 3 is started to spray compressed air to clear the gap 13.

[0024] Those skilled in the art will appreciate that the modules in the device can be adaptively split or merged. Such splitting or merging of specific modules will not cause the technical solution to deviate from the principle of the present invention, and therefore, the technical solutions after splitting or merging will fall within the protection scope of the present invention.

[0025] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A lost foam mold, comprising an upper mold and a lower mold that can be buckled with each other, wherein the upper mold and the lower mold are buckled to form a closed cavity, characterized in that: include A connected exhaust pipe is arranged on the inner wall of the upper mold; A connected feeding pipe is arranged on the inner wall of the upper die; A spherical cavity connected to the feed pipe, a steam pipe connected to the spherical cavity is arranged on the side wall of the spherical cavity, and the steam pipe coincides with the axis of the feed pipe; A container, wherein the container is connected to the spherical cavity through a pipeline, a second valve is arranged on the container, a first valve is arranged on the pipeline, the feed pipe and the steam pipe both extend into the spherical cavity, the extending end of the steam pipe is sleeved in the feed pipe, and there is a gap between the outer wall of the steam pipe and the inner wall of the feed pipe.

2. A lost foam mold according to claim 1, characterized in that: A portion of the inner wall of the upper mold is formed by a slatted plate, and the slatted plate covers the inner end of the exhaust pipe.

3. A lost foam mold according to claim 2, characterized in that: A cooling pipe is arranged in the slatted plate.

4. The lost foam mold according to claim 3, characterized in that: The inner wall of the upper mold has an inclined surface, the top of the inclined surface is inclined toward the center of the upper mold, and the slatted plate is located on the inclined surface.

5. A lost foam mold according to any one of claims 2 to 4, characterized in that: The feed pipe is located below the slatted plate.

6. A lost foam mold according to any one of claims 2 to 4, characterized in that: A plurality of blowing nozzles are arranged in the exhaust pipe, and the plurality of blowing nozzles are directly facing the slatted plate, and a pressure sensor is arranged on the inner wall of the upper mold.

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