Precious metal plaster mold assembly

Abstract

According to the precious metal gypsum mold assembly, in the using process, when a tank body filled with gypsum slurry is placed on a centrifugal device to rotate at a high speed, the slurry moves towards the periphery of the tank body under the action of centrifugal force. As the slurry contains microbubbles and part of water, the water and gas gradually migrate towards the direction of the air holes along with the centrifugal process. Part of water can penetrate through the one-way air-permeable and water-permeable membrane to enter a deformation cavity in the composite membrane, and extrusion force towards the axis direction of the tank body is generated on the one-way air-permeable and water-permeable membrane under the action of centrifugal force. The deformation cavity effectively buffers the instantaneous extrusion force generated by the slurry on the one-way air-permeable and water-permeable membrane under high-speed rotation, so that the one-way air-permeable and water-permeable membrane is prevented from being broken or broken by the slurry due to excessive deformation; and on the other hand, the deformation direction of the one-way air-permeable and water-permeable film due to water extrusion is limited to be close to the axis, so that the one-way air-permeable and water-permeable film is prevented from sinking into the air hole, gypsum slurry is prevented from sinking into the hole to form a bulge, and the problem that the mold is difficult to smoothly separate after molding is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gypsum mold manufacturing, in particular to a precious metal gypsum mold assembly. BACKGROUND

[0002] In the process of gold and precious metal processing, the lost wax casting process is adopted, and gypsum is used as a mold for subsequent gold jewelry forming.

[0003] In the process of manufacturing the gypsum mold, the gypsum mold can be formed only after the gypsum slurry is solidified. During the solidification process, the water and gypsum powder need to be mixed in a certain proportion during the manufacturing process of the gypsum slurry. Air enters the gypsum slurry during the mixing process. During the gypsum forming process, if the air cannot be discharged, pores will be formed on the surface of the gypsum mold, resulting in pits on the surface of the gypsum mold, which will cause large surface defects of the subsequent gold jewelry.

[0004] The existing method is to place the gypsum slurry in a tank, open a plurality of air permeable holes on the outside of the tank, set a one-way air film at the air permeable hole, and place the tank containing the gypsum slurry on a centrifugal device. The air in the gypsum slurry is discharged by high-speed rotation. During high-speed rotation, a negative pressure environment is formed around the gypsum slurry, which further improves the discharge of air in the gypsum slurry.

[0005] However, the above method will cause the gypsum slurry to move outward under the action of centrifugal force, and an extrusion force will be generated on the one-way air film. Due to the existence of the extrusion force, the one-way air film is easily damaged, and the gypsum slurry is further ejected. Secondly, under the action of the extrusion force, the one-way air film is concave to the inside of the air permeable hole. At this time, the gypsum slurry will be partially sunk into the air permeable hole, forming a surface protrusion. When the solidified gypsum is taken out, the protrusion will be stuck in the air permeable hole, making it difficult to take out the solidified gypsum. SUMMARY

[0006] Therefore, it is necessary to provide a precious metal gypsum mold assembly to solve the above problems.

[0007] Embodiments of the present application provide a precious metal gypsum mold assembly, comprising:

[0008] The tank has an accommodating cavity formed therein, and the tank is provided with an air permeable hole;

[0009] The composite film comprises a one-way air and water permeable film, an air permeable supporting film, and a connecting assembly between the one-way air and water permeable film and the air permeable supporting film, a deformation cavity is formed between the one-way air and water permeable film, the air permeable supporting film, and the connecting assembly, the air permeable supporting film is arranged around the one-way air and water permeable film, the composite film is accommodated in the accommodation cavity and shields the air hole.

[0010] When centrifuged, part of the water in the gypsum slurry in the accommodation cavity enters the deformation cavity to generate a pressing force of the one-way air and water permeable film towards the axis of the accommodation cavity.

[0011] In at least one embodiment of the present application, the connecting assembly comprises:

[0012] A fixing ring is arranged between the one-way air and water permeable film and the air permeable supporting film, and the fixing ring, the one-way air and water permeable film, and the air permeable supporting film form the deformation cavity.

[0013] In at least one embodiment of the present application, the connecting assembly further comprises:

[0014] An elastic film is arranged in the deformation cavity, and the elastic film is fixedly connected with the fixing ring, and the elastic film is arranged close to the one-way air and water permeable film.

[0015] In at least one embodiment of the present application, the connecting assembly further comprises:

[0016] A hydrogel layer is arranged between the elastic film and the one-way air and water permeable film.

[0017] In at least one embodiment of the present application, the distance between the elastic film and the one-way air and water permeable film is denoted as a, the thickness of the hydrogel layer is denoted as b, and the relationship a > b ≥ 2 / 3a is satisfied.

[0018] In at least one embodiment of the present application, the projection area of the one-way air and water permeable film completely shields the air hole in the radial direction.

[0019] In at least one embodiment of the present application, the air hole is arranged on the peripheral wall of the tank body.

[0020] In at least one embodiment of the present application, the hydrogel layer is annular.

[0021] In at least one embodiment of the present application, the fixing ring is two, and the two fixing rings are arranged at the two ends of the outer circumferential surface of the one-way air and water permeable film.

[0022] In at least one embodiment of the present application, the noble metal gypsum mold assembly further comprises:

[0023] A cover body is combined on the tank body.

[0024] The precious metal gypsum mold assembly of the embodiment has at least the following beneficial effects:

[0025] The provided precious metal gypsum mold assembly has at least the following beneficial effects:

[0026] The deformation cavity effectively buffers the instantaneous extrusion force of the slurry on the one-way air and water permeable membrane under high-speed rotation, prevents the one-way air and water permeable membrane from being broken or being broken by the slurry due to excessive deformation, and on the other hand, the deformation direction of the one-way air and water permeable membrane is limited to the direction of approaching the axis, avoiding the concave of the one-way air and water permeable membrane to the inside of the air hole, and further preventing the gypsum slurry from sinking into the hole to form a protrusion, solving the problem of difficult mold stripping after forming. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 Figure 1 is a structural diagram of the precious metal gypsum mold assembly;

[0028] Figure 2 Figure 1 is a structural diagram of the precious metal gypsum mold assembly;

[0029] Figure 3 Figure 1 is a structural diagram of the precious metal gypsum mold assembly;

[0030] Figure 4 Figure 1 is a structural diagram of the precious metal gypsum mold assembly; Figure 3

[0031] Figure 1 is a structural diagram of the precious metal gypsum mold assembly; Figure 5 Figure 4 Figure 1 is a structural diagram of the precious metal gypsum mold assembly;

[0032] Figure 6 Figure 1 is a structural diagram of the precious metal gypsum mold assembly;

[0033] Figure 1 is a structural diagram of the precious metal gypsum mold assembly; Figure 7 Figure 6 Figure 1 is a structural diagram of the precious metal gypsum mold assembly;

[0034] Figure 1 is a structural diagram of the precious metal gypsum mold assembly; Figure 8 Figure 7 Figure 1 is a structural diagram of the precious metal gypsum mold assembly.

[0035] MAIN ELEMENT SYMBOL EXPLANATION

[0036] 100, precious metal gypsum mold assembly;

[0037] ​110, tank body; 110a, accommodating cavity; 110b, air vent hole;

[0038] 120, composite film; 121, one-way air and water permeable film; 122, air permeable supporting film; 123, connecting assembly; 124, deformation cavity; 1231, fixing ring; 1232, elastic film; 1233, hydrogel layer;

[0039] 130, cover body. DETAILED DESCRIPTION

[0040] The embodiments of the present application will be described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments.

[0041] It should be noted that when one component is considered to be "connected" to another component, it can be directly connected to the other component or can exist with a middle component. When one component is considered to be "provided on" another component, it can be directly provided on the other component or can exist with a middle component. The terms "top", "bottom", "upper", "lower", "left", "right", "front", "back", and the like used herein are for illustrative purposes only.

[0042] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0043] The embodiments of the present application provide a precious metal gypsum mold assembly 100, comprising:

[0044] A tank body 110, an accommodating cavity 110a is formed inside, and the tank body 110 is provided with an air vent hole 110b;

[0045] A composite film 120, comprising a one-way air and water permeable film 121, an air permeable supporting film 122, and a connecting assembly 123, the connecting assembly 123 is located between the one-way air and water permeable film 121 and the air permeable supporting film 122, a deformation cavity 124 is formed between the one-way air and water permeable film 121, the air permeable supporting film 122 and the connecting assembly 123, the air permeable supporting film 122 is arranged around the one-way air and water permeable film 121, the composite film 120 is accommodated in the accommodating cavity 110a and covers the air vent hole 110b;

[0046] Wherein, during centrifugation, part of the water in the gypsum slurry in the accommodating cavity 110a enters the deformation cavity 124 to generate a pressing force on the one-way air and water permeable film 121 towards the axis of the accommodating cavity 110a.

[0047] Please refer to Figures 1-8In the present embodiment, when the tank 110 containing the gypsum slurry is placed on the centrifugal device and rotated at high speed, the slurry moves outward along the outer periphery of the tank 110 under the action of centrifugal force. Since the slurry contains micro-bubbles and part of the water, the water and gas gradually migrate to the air permeable hole 110b as the centrifugation process proceeds. Part of the water can pass through the one-way air and water permeable membrane 121 into the deformation cavity 124 inside the composite membrane 120, and under the action of centrifugal force, an extrusion force is generated on the one-way air and water permeable membrane 121 towards the axis of the tank 110.

[0048] The deformation cavity 124 effectively buffers the instantaneous extrusion force generated by the slurry on the one-way air and water permeable membrane 121 at high speed, preventing the one-way air and water permeable membrane 121 from being broken or being broken by the slurry due to excessive deformation; on the other hand, the deformation direction of the one-way air and water permeable membrane 121 due to water extrusion is limited to approaching the axis, avoiding its inward indentation into the air permeable hole 110b, and further preventing the gypsum slurry from sinking into the hole to form a protrusion, solving the problem of difficult mold stripping after forming.

[0049] Since the air permeable support membrane 122 plays an external limiting support role on the one-way air permeable membrane, it further enhances the overall deformation resistance of the membrane. While ensuring the smooth discharge of micro-bubbles, it effectively prevents slurry leakage or splashing, improving the stability and safety of the defoaming process. This structure takes into account the air permeability, pressure resistance and structural reliability.

[0050] By setting the composite membrane 120 structure with a deformation cavity 124, the impact resistance and structural stability of the membrane are significantly improved under the premise of ensuring defoaming efficiency, solving the problems of easy damage of the one-way air and water permeable membrane 121, slurry leakage and mold sticking in the prior art.

[0051] It should be noted that the tank 110 is roughly a cylindrical shape with an open receiving cavity 110a formed by inwardly recessing one end, and the air permeable hole 110b is a circular through hole.

[0052] The one-way air and water permeable membrane 121 is roughly a tubular membrane in the shape of a ring and is made of a flexible material with high water and air permeability. For example: hydrophilic non-woven fabric (such as PET or PP hot-rolled non-woven fabric), cellulose membrane (such as hydroxypropyl cellulose membrane), polypropylene microporous membrane (loose structure type), nanofiber membrane (PAN, PVDF fiber layer), etc.

[0053] The air permeable support membrane 122 is roughly a tubular membrane in the shape of a ring and is made of a hard material with high air permeability and no water permeability. For example: sintered metal material (such as stainless steel sintered mesh, copper powder sintered sheet), ceramic air permeable sheet (such as alumina ceramic, porous silicon), microporous silicon carbide (SiC) plate, etc.

[0054] In at least one embodiment of the present application, the connecting assembly 123 comprises:

[0055] The fixing ring 1231 is arranged between the one-way air and water permeable membrane 121 and the air permeable supporting membrane 122, and the fixing ring 1231, the one-way air and water permeable membrane 121 and the air permeable supporting membrane 122 form the deformation cavity 124.

[0056] Please refer to Figures 1-8 In this embodiment, during assembly, the fixing ring 1231 is arranged at an intermediate position between the one-way air and water permeable membrane 121 and the air permeable supporting membrane 122, and the two are tightly connected with the fixing ring 1231. In this way, the three together form a closed annular or locally closed cavity, i.e. the deformation cavity 124.

[0057] When the tank 110 is filled with gypsum slurry and starts to centrifuge, the slurry moves outward under the action of centrifugal force and forms a pressing force on the composite membrane 120. At the same time, part of the water in the slurry will penetrate into the deformation cavity 124 through the one-way air and water permeable membrane 121.

[0058] After the water enters the deformation cavity 124, the pressure in the deformation cavity 124 rises, which will exert a reaction force on the one-way air and water permeable membrane 121 towards the axis direction of the tank 110, thereby limiting the excessive bulging of the membrane, playing a buffering and regulating role.

[0059] During the entire centrifugation process, the fixing ring 1231 ensures the structural integrity of the deformation cavity 124, so that the functional cavity maintains sealing and stable deformation, avoids leakage of the gypsum slurry through the membrane, and at the same time maintains the micro-deformation state of the membrane, which is beneficial to the discharge of micro-bubbles without material damage.

[0060] The fixing ring 1231 partitions and fixes the structure of the one-way air and water permeable membrane 121, so that the pressure borne by the one-way air permeable membrane under the centrifugal state is evenly distributed in the entire deformation cavity 124, preventing the membrane from being torn or failed due to local stress concentration.

[0061] The fixing ring 1231 fixes the edges of the two membrane materials, and structurally defines the range and spatial shape of the deformation cavity 124, so that the cavity can deform controllably when water is extruded, and has good reusability and mechanical stability.

[0062] By limiting the stress direction and deformation amplitude of the one-way air and water permeable membrane 121, it is ensured that water and air can be smoothly discharged while the slurry cannot be discharged, achieving the purpose of efficient defoaming and avoiding the formation of pores on the surface of the mold or leakage of the slurry.

[0063] It should be noted that the fixing ring 1231 is generally annular.

[0064] In at least one embodiment of the present application, the connecting assembly 123 further comprises:

[0065] An elastic film 1232 is arranged in the deformation cavity 124 and fixedly connected with the fixed ring 1231, and the elastic film 1232 is arranged close to the one-way air and water permeable film 121.

[0066] Please refer to Figures 1-8 In this embodiment, the elastic film 1232 is arranged inside the deformation cavity 124 surrounded by the fixed ring 1231, between the one-way air and water permeable film 121 and the air permeable supporting film 122, more specifically, arranged close to and towards the one-way air and water permeable film 121, and stably connected with the fixed ring 1231 through the edge or clamping groove of the fixed ring 1231.

[0067] When the gypsum slurry is injected into the tank 110 and centrifuged, the slurry moves radially outward along the tank 110 under high-speed rotation, generating a large centrifugal extrusion pressure, and especially the mixed micro-bubbles and part of the water in the slurry will migrate outward along the air permeable hole 110b.

[0068] Part of the water penetrates through the one-way air and water permeable film 121 into the deformation cavity 124, and the pressure in the cavity increases. In this process, the elastic film 1232 is elastically deformed due to the pressure and deviates to the inside (i.e. axial) direction, thereby forming a reverse adjusting force to inhibit the one-way air and water permeable film 121 from being excessively bulged or structurally unstable due to external pressure.

[0069] The elastic film 1232 provides a dynamically variable buffer layer that can adapt to the changing pressure of the gypsum slurry under different centrifugal speeds and different liquid level heights, and improves the tolerance range of the film structure to external force.

[0070] The elastic film 1232 is arranged close to the one-way air and water permeable film 121 and provides positive support after the water is extruded into the deformation cavity 124, thereby preventing the one-way air permeable film from being bulged outward due to the increased cavity pressure, prolonging the service life of the one-way air and water permeable film 121, and preventing tearing or fatigue damage.

[0071] A multi-layer protection structure is formed in the deformation cavity 124, and the elastic film 1232 acts as an intermediate buffer that can absorb energy and delay transmission to the one-way air and water permeable film 121 in the case of sudden increase in slurry pressure, thereby effectively avoiding mold sticking or protrusion caused by slurry extrusion into the air permeable hole 110b.

[0072] It should be noted that the elastic film 1232 is generally a ring-shaped tubular film made of a highly air-permeable and water-impermeable elastic material. For example, a hydrophobic coated silica gel film.

[0073] In at least one embodiment of the present application, the connecting assembly 123 further comprises:

[0074] A hydrogel layer 1233 is arranged between the elastic film 1232 and the one-way gas and water permeable film 121.

[0075] Please refer to Figures 1-8 In this embodiment, during use, the gypsum slurry is injected into the tank 110 provided with the composite film 120, and is subjected to high-speed defoaming treatment in a centrifugal device. Under the action of centrifugal force, the bubbles and part of the water remaining in the slurry are squeezed to the circumferential side wall of the tank 110 and discharged through the gas permeable hole 110b.

[0076] When the water in the gypsum slurry permeates through the one-way gas and water permeable film 121 to the back side of the film, the part of the water is first absorbed by the hydrogel layer 1233. The hydrogel layer 1233 has good water absorption and expandability, and rapidly expands in volume after absorbing water, thereby forming a soft and elastic support structure between the elastic film 1232 and the one-way gas and water permeable film 121.

[0077] Firstly, the hydrogel layer 1233 effectively shares the hydraulic pressure applied to the one-way gas permeable film during the centrifugation process by swelling through water absorption, and actively buffers to prevent the film from being locally bulged or structurally fatigued under high pressure.

[0078] Secondly, the hydrogel layer 1233 is attached to the back of the one-way gas permeable film, and its flexible support performance helps to limit the deformation direction and degree of the film surface, thereby avoiding the problem of gypsum slurry being squeezed into the gas permeable hole 110b due to the bulging of the film surface, and ensuring the surface flatness and integrity of the mold after defoaming.

[0079] During the exhaust process, the hydrogel layer 1233 itself does not hinder the escape of gas through the film, and the adsorption of water in its interior can reduce the accumulation of free liquid in the deformation cavity 124, prevent local water accumulation from interfering with the gas permeable channel, and further improve the defoaming efficiency and stability of the film function.

[0080] In addition, the hydrogel, as a mild responsive material, not only has good environmental adaptability, but also has recoverability and certain self-repairing ability, which can effectively prolong the service life of the composite film 120 assembly.

[0081] In summary, the hydrogel layer 1233, as a buffer functional material arranged between the one-way gas permeable film and the elastic film 1232, can synergistically act with the film structure during the centrifugal defoaming process, realize flexible control of the film surface deformation, dynamic response to pressure fluctuations, and absorption regulation of water infiltration, further optimize the performance of the film in high-strength centrifugal environment, and improve the surface quality of the gypsum mold forming and the smoothness of the mold demolding.

[0082] It should be noted that the water gel layer 1233 can be a whole piece, or can be segmented, and multiple air holes can be provided on the water gel layer 1233.

[0083] In at least one embodiment of the present application, the distance between the elastic film 1232 and the one-way air and water permeable film 121 is denoted as a, and the thickness of the water gel layer 1233 is denoted as b, and the relationship a > b ≥ 2 / 3a is satisfied.

[0084] Please refer to Figures 1-8 In the present embodiment, the elastic film 1232 is arranged in the deformation cavity 124, close to the one-way air and water permeable film 121, and a certain distance a is formed between the two, and a water gel layer 1233 is arranged in the space. The thickness of the water gel layer 1233 is denoted as b. In order to ensure that the water gel can fully play a buffering and supporting role in the water absorption and swelling state, and not to cause excessive extrusion or hinder the air permeability of the film surface, the applicant limits the thickness b of the water gel layer 1233, and sets the relationship between the film distance a as follows: a > b ≥ 2 / 3a.

[0085] In the initial state, the water gel layer 1233 is between the elastic film 1232 and the one-way air and water permeable film 121, and the thickness is slightly less than the distance a, so that the water gel layer 1233 does not adhere to the surface of the one-way air and water permeable film 121 before swelling, avoiding excessive stress on the one-way air and water permeable film 121 in the initial stage, and ensuring the normal breathing and air permeability of the one-way air and water permeable film 121.

[0086] When the centrifugal defoaming starts, part of the water in the gypsum slurry penetrates into the composite film 120 through the one-way air and water permeable film 121 and is absorbed by the water gel layer 1233.

[0087] The water gel absorbs water and swells, and the thickness b increases accordingly. However, since the initial thickness is set to be not greater than a, and the maximum can approach a, the volume after swelling is just filled or close to filled with the space between the elastic film 1232 and the one-way air and water permeable film 121, realizing precise film surface support and hydraulic buffering.

[0088] After the whole centrifugal process is completed, the water in the water gel is gradually released or evaporated, and the volume is restored accordingly, and the system can return to the initial structure state, which is beneficial to reuse and structural durability.

[0089] By setting b to be less than a, it is ensured that the water gel does not adhere to or press the one-way air permeable film in advance in the dry state, avoiding affecting the initial air permeability of the film surface, and facilitating the normal exhaust of the film surface in the starting stage.

[0090] The water-absorbing hydrogel expands, and if the thickness exceeds a, the unidirectional air-permeable film can be reversely pressed, causing the film to bulge or locally collapse. In this embodiment, b is set to be no more than a, so as to controllably limit the expansion range of the gel, provide support and buffering, and avoid excessive deformation, thereby improving the structural reliability.

[0091] By limiting b to be at least 2 / 3a, it can be ensured that the water-absorbing hydrogel layer 1233 has sufficient volume change space after absorbing water, so as to have obvious buffering function and stress absorption capacity, and improve the responsiveness and pressure regulating capacity of the deformation cavity 124.

[0092] Reasonable control of the ratio of b to a can make the film body deform stably and uniformly during the exhaust process, avoid local film bulging, and further ensure that the surface of the plaster mold is smooth and complete without bulging or collapse, thereby improving the surface quality of the castings.

[0093] In at least one embodiment of the present application, the projection area of the unidirectional air-permeable and water-permeable film 121 completely blocks the air-permeable hole 110b in the radial direction.

[0094] Please refer to Figures 1-8 In this embodiment, the composite film 120 is installed inside the tank body 110, and the unidirectional air-permeable and water-permeable film 121 is located on the inner side of the composite film 120, i.e. close to the plaster slurry side. The air-permeable hole 110b is opened on the circumferential wall of the tank body 110, and the radial projection area of the unidirectional air-permeable and water-permeable film 121 is designed to be greater than or equal to the opening size of the air-permeable hole 110b, and the position is accurately covered with the air-permeable hole 110b, so that the air-permeable hole 110b is completely covered in the radial projection direction.

[0095] After the centrifugal operation is started, the plaster slurry moves to the circumferential outer wall under the action of centrifugal force, and the micro-bubbles and part of the water in the slurry migrate to the inner wall of the tank body 110, and try to be discharged through the air-permeable hole 110b.

[0096] Before the gas or water contacts the air-permeable hole 110b, it must first pass through the unidirectional air-permeable and water-permeable film 121. Since the film has a unidirectional permeability, it allows liquid or gas to flow from the slurry side to the outside of the film, but cannot pass in the opposite direction.

[0097] Because the unidirectional air-permeable and water-permeable film 121 completely blocks the radial projection of the air-permeable hole 110b, even if the plaster slurry is directly pressed in the radial direction in the centrifugal state, it cannot contact the body of the air-permeable hole 110b, thereby avoiding the slurry from entering the hole or splashing.

[0098] By setting the unidirectional air-permeable and water-permeable film 121 to completely cover the radial direction of the air-permeable hole 110b, it is ensured that the slurry is always blocked by the film body during the centrifugal pressing process, thereby eliminating the risk of the slurry entering the air-permeable hole 110b or being stuck in the hole from the source, and solving the problem of bulging on the surface of the plaster mold and difficult demolding.

[0099] The gas and moisture must pass through the one-way gas and moisture permeable membrane 121 before being discharged, thereby avoiding air flow bypassing the membrane body and being directly discharged, improving the use efficiency and filtering effect of the membrane, and helping to achieve controllable exhaust and directional defoaming.

[0100] Since the arrangement range of the one-way gas and moisture permeable membrane 121 exceeds the boundary of the gas permeable hole 110b, the overall stress is more uniform, and the membrane surface will not be torn due to local suspension or edge pressure, which helps to prolong the service life of the membrane body and improve the structural integrity under centrifugal working conditions.

[0101] The gas permeable hole 110b is completely covered by the membrane body, ensuring that the slurry does not form a hole in the centrifugal state and that abnormal structures such as material accumulation are avoided, which is beneficial to obtaining a gypsum mold product with a dense surface and consistent profile.

[0102] In at least one embodiment of the present application, the gas permeable hole 110b is arranged on the peripheral wall of the tank body 110.

[0103] Please refer to Figures 1-8 In this embodiment, the gas permeable hole 110b is arranged on the peripheral wall of the tank body 110, i.e. the gas permeable hole 110b is arranged along the radial outer wall region of the cylindrical structure of the tank body 110. The gypsum slurry is injected into the accommodating cavity 110a of the tank body 110 during the pouring stage, and the slurry covers the peripheral position where the gas permeable hole 110b is located. In the static state, the slurry is uniformly distributed as a whole.

[0104] The tank body 110 rotates at high speed on the centrifugal device, and the gypsum slurry moves in the radial direction towards the peripheral wall of the tank body 110 under the action of centrifugal force. At this time, the micro-bubbles and moisture in the slurry also move towards the peripheral wall and concentrate in the area close to the gas permeable hole 110b.

[0105] The gas permeable hole 110b arranged on the peripheral wall is located in the main direction of the slurry centrifugal migration, so the bubbles and part of the moisture in the slurry first concentrate here. The gas permeable hole 110b guides the one-way exhaust of gas and blocks the leakage of the slurry through the composite membrane 120 (including a one-way gas permeable membrane and other structures) covered thereby, and completes the efficient defoaming process.

[0106] The gypsum slurry moves outward in the radial direction during centrifugation, and if the gas permeable hole 110b is arranged at the top or bottom, the exhaust path deviates from the main movement direction, resulting in low defoaming efficiency. Arranged on the peripheral wall (radial direction), the gas permeable hole 110b is arranged in the area where bubbles and moisture concentrate, which can shorten the migration path of bubbles and accelerate the release speed of gas, significantly improving the defoaming effect.

[0107] Since the centrifugal force direction is consistent with the membrane stress direction, the composite membrane 120 arranged outside the peripheral wall gas permeable hole 110b can more fully play the deformation, support, buffering and one-way exhaust functions, the hydraulic pressure on the membrane surface is more controllable and uniform, and the overall structural stability is improved.

[0108] In at least one embodiment of the present application, the hydrogel layer 1233 is annular.

[0109] Please refer to Figures 1-8 In this embodiment, during the assembly of the composite film 120 assembly, the hydrogel material is placed in an annular manner between the elastic film 1232 and the one-way gas and water permeable film 121. The annular distribution can be arranged symmetrically around the gas permeable hole 110b or the center area of the film surface, together with the fixed ring 1231 and the edge of the elastic film 1232 to define the expansion area of the gel.

[0110] When the tank 110 filled with gypsum slurry is subjected to high-speed centrifugation, the slurry moves outward radially under the action of centrifugal force, and the water and gas in the slurry migrate towards the direction close to the peripheral wall of the tank 110.

[0111] The water that penetrates through the one-way gas and water permeable film 121 is first absorbed by the annular hydrogel layer 1233. Due to its closed annular shape, it can produce uniform and annular support and buffering effect in the radial and circumferential range after swelling, stabilize the film surface shape, and limit excessive deformation or local bulging.

[0112] The annular gel layer does not completely cover the center of the film surface, avoiding blocking the gas flow path, thereby ensuring that the bubbles can be quickly discharged after passing through the one-way gas and water permeable film 121. At the same time, the annular structure helps to form a local cavity, which is beneficial to maintaining the gas permeability while adjusting the pressure in the cavity.

[0113] The annular structure can form a stable edge support ring in the stress area of the film body by arranging the gel material along the boundary or local area, limiting the deformation of the film body to a certain range, and helping the film surface to maintain structural integrity and not to bulge excessively during exhaust.

[0114] Due to the fact that the middle part is not covered by the gel, the effective gas discharge path above the gas permeable hole 110b is still retained, improving the efficiency and continuity of bubble discharge, avoiding the blockage of the exhaust path due to the swelling of the gel, and maintaining the defoaming ability of the film assembly.

[0115] The annular hydrogel structure reduces the total amount and overall thickness of the gel while maintaining the supporting function, improves the water absorption and swelling response speed, and reduces the material cost and structure weight, which is beneficial to industrial scale application.

[0116] The annular structure helps to form a hollow area, leaving part of the compressible space when absorbing water and swelling, so that the deformation cavity 124 can realize a smoother buffering adjustment process under different pressure states, improving the overall pressure resistance and self-adjusting ability of the film assembly.

[0117] The annular gel is more easily subjected to annularly symmetrical stress and deformation control, avoids structural distortion or local failure caused by uneven deformation, and is conducive to multiple use of the membrane body and prolonging the product life.

[0118] In at least one embodiment of the present application, the two fixing rings 1231 are respectively arranged at the two end portions of the outer circumferential surface of the one-way air and water permeable membrane 121.

[0119] Please refer to Figures 1-8 In the present embodiment, the two fixing rings 1231 are respectively arranged at the edge portions of the one-way air and water permeable membrane 121, so that the membrane body is clamped by the two annular support members in front and back, and cooperates with the peripheral air permeable support membrane 122 to form a closed deformation cavity 124, thereby providing space and limiting basis for the functional components such as the hydrogel layer 1233 and the elastic membrane 1232.

[0120] When the tank body 110 rotates, the slurry moves outward under the action of centrifugal force, and the water in the slurry permeates the one-way air and water permeable membrane 121 into the deformation cavity 124, and a certain extrusion pressure is formed inside. In this process, the two fixing rings 1231 uniformly constrain the membrane edges, ensuring that the deformation of the membrane after being pressed is limited to the middle region, forming a stable and controllable membrane drum area, and preventing the membrane edges from rolling or dislocating.

[0121] Since the fixing rings 1231 firmly lock the membrane boundaries, the one-way air permeable membrane only deforms within a limited range during the defoaming process, ensuring that the gas can be orderly discharged, while the overall structure integrity is not damaged.

[0122] The double fixing rings 1231 seal the edges of the one-way membrane from both ends, effectively preventing the edges of the membrane body from warping, bulging or displacing due to hydraulic or centrifugal force, and ensuring that the membrane body is stably stressed throughout the use cycle.

[0123] The double-ring fixing can form a higher quality circumferential sealing structure, which helps to prevent the slurry from penetrating into the edges or gaps of the membrane body, while ensuring that the gas can only be discharged through the membrane body before being discharged, thereby improving the exhaust efficiency and reliability.

[0124] In at least one embodiment of the present application, the noble metal gypsum mold assembly 100 further comprises:

[0125] The cover body 130 is covered on the tank body 110.

[0126] Please refer to Figures 1-8 In the present embodiment, after the gypsum slurry is injected, the operator covers the cover body 130 on the opening of the tank body 110 to form a top closed state, and in combination with the air permeable hole 110b of the tank body 110 and the composite membrane 120 structure covered thereby, a defoaming cavity with good sealing performance is formed, which allows gas to be discharged in a specific direction only.

[0127] The tank body 110 rotates at high speed on the centrifugal device, and the slurry is moved outward to the peripheral wall under the centrifugal force. At this time, the cover body 130 can effectively prevent the slurry from splashing or the airflow from being turbulent, maintain the stability of the internal air pressure of the containing cavity 110a, and help the slurry to uniformly settle and the bubbles to concentrate and float to the membrane surface direction.

[0128] Since the top has been closed, the bubbles and moisture generated by the gypsum slurry during the centrifugation process can only be discharged through the composite membrane 120 at the peripheral wall, further strengthening the controllability of the one-way air permeation path, and improving the overall defoaming efficiency and directionality of the exhaust.

[0129] It should be noted that the cover body 130 is generally a round cover.

[0130] The above only describes the embodiments of the present application, and it should be noted that those skilled in the art can make improvements without departing from the creative concept of the present application, but these all belong to the protection scope of the present application.

Claims

1. A precious metal gypsum mold assembly, characterized by, The application relates to a gypsum mold assembly. The gypsum mold assembly comprises a tank body and a composite film. The tank body is internally formed with a containing cavity, and is provided with a gas-permeable hole. The composite film comprises a one-way gas-permeable and water-permeable film, a gas-permeable supporting film and a connecting assembly.

2. The precious metal gypsum mold assembly of claim 1, wherein, The connecting assembly is located between the one-way gas-permeable and water-permeable film and the gas-permeable supporting film. The one-way gas-permeable and water-permeable film, the gas-permeable supporting film and the connecting assembly are surrounded to form a deformation cavity.

3. The precious metal gypsum mold assembly of claim 2, wherein, The gas-permeable supporting film is arranged around the one-way gas-permeable and water-permeable film. The composite film is accommodated in the containing cavity and covers the gas-permeable hole.

4. The precious metal gypsum mold assembly of claim 3, wherein, When centrifuged, part of water in gypsum slurry in the containing cavity enters the deformation cavity to generate extrusion force of the one-way gas-permeable and water-permeable film towards the axis of the containing cavity. The connecting assembly comprises a fixing ring.

5. The precious metal gypsum mold assembly of claim 4, wherein, The fixing ring is arranged between the one-way gas-permeable and water-permeable film and the gas-permeable supporting film.

6. The precious metal gypsum mold assembly of claim 2, wherein, The fixing ring and the one-way gas-permeable and water-permeable film and the gas-permeable supporting film surround to form the deformation cavity.

7. The precious metal gypsum mold assembly of claim 1, wherein, The connecting assembly further comprises an elastic film.

8. The precious metal gypsum mold assembly of claim 4, wherein, The elastic film is arranged in the deformation cavity and is fixedly connected with the fixing ring.

9. The precious metal gypsum mold assembly of claim 2, wherein, The elastic film is arranged close to the one-way gas-permeable and water-permeable film.

10. The precious metal gypsum mold assembly of claim 1, wherein, The connecting assembly further comprises a hydrogel layer. The hydrogel layer is arranged between the elastic film and the one-way gas-permeable and water-permeable film. The distance between the elastic film and the one-way gas-permeable and water-permeable film is marked as a, and the thickness of the hydrogel layer is marked as b. The relationship a > b >= 2 / 3a is satisfied. In the radial direction, the projection area of the one-way gas-permeable and water-permeable film completely covers the gas-permeable hole. The gas-permeable hole is arranged on the peripheral wall of the tank body. The hydrogel layer is annular. The fixing ring is two, and the two fixing rings are respectively arranged at the two ends of the outer circumferential surface of the one-way gas-permeable and water-permeable film. The noble metal gypsum mold assembly further comprises a cover body. The cover body covers the tank body.

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