Negative pressure pumping mechanism of gold mold

Abstract

This application provides a negative pressure extraction mechanism for a gold mold. The mechanism involves a tank containing foamed plaster with vent holes. An eccentric device drives the tank to rotate eccentrically. Under centrifugal force, the slurry moves towards the first accumulation zone, while air bubbles are forced to the second accumulation zone due to density differences and are discharged into the negative pressure chamber through the vent holes. By combining centrifugal force for active separation with negative pressure to extract air bubbles from the plaster slurry, the mechanism achieves a transformation from "dispersed distribution" to "concentrated aggregation". The aggregated air bubbles are quickly connected to the negative pressure chamber through dedicated vent holes and discharged using dual power, thus solving the problem of quickly extracting air bubbles from the plaster slurry.

Description

Technical Field

[0001] This application relates to the field of plaster molds, and more particularly to a negative pressure extraction mechanism for a gold mold. Background Technology

[0002] Gold molds are widely used in precision casting, especially in the manufacture of high-precision products such as jewelry and dental products. The core of the process is molding by injecting plaster slurry into the mold cavity. During injection molding, the plaster slurry must be thoroughly purged of internal gases before curing to ensure uniform and dense filling inside the mold, thus preventing defects such as porosity and shrinkage in the finished product. However, the high value of gold places stringent requirements on the precision of the mold forming process; even the slightest gas residue can lead to the scrapping of the casting. Therefore, the efficiency of gas purging directly determines the production yield and cost.

[0003] To address the issue of air bubbles within gypsum slurry, existing technologies employ vacuum extraction. This involves placing the mold within a sealed chamber and using an external vacuum pump to remove the gas. However, this method is energy-intensive and time-consuming. Furthermore, the gas distribution within the gypsum slurry is relatively dispersed, and some gas is trapped within the slurry, making it difficult to extract quickly and effectively, thus resulting in a lengthy evacuation process.

[0004] Therefore, there is a need for a negative pressure extraction mechanism for gold molds that can quickly extract air bubbles from plaster slurry. Summary of the Invention

[0005] In view of this, it is necessary to provide a negative pressure extraction mechanism for gold molds that can quickly extract air bubbles from plaster slurry in order to solve the above problems.

[0006] Embodiments of this application provide a negative pressure extraction mechanism for a gold mold, comprising:

[0007] The tank is filled with foamed gypsum, and air vents are provided on the outer circumferential surface of the tank.

[0008] An eccentric device includes a rotating shaft and a mounting bracket that rotates about the rotating shaft. The mounting bracket has at least one negative pressure tank, and a negative pressure cavity is formed inside the negative pressure tank. The tank body is disposed inside the negative pressure cavity.

[0009] The tank body has a first accumulation zone and a second accumulation zone that are sequentially close to the rotating axis.

[0010] When the tank rotates around the rotating axis, the gypsum slurry in the foamed gypsum moves towards the first accumulation zone under the action of centrifugal force, and the gypsum slurry pushes the air bubbles towards the second accumulation zone, so that the air bubbles in the second accumulation zone are discharged into the negative pressure chamber through the air guide hole.

[0011] In at least one embodiment of this application, the negative pressure tank further comprises:

[0012] A flow guiding component is provided with a gap between it and the circumferential inner wall of the negative pressure tank to form the negative pressure cavity;

[0013] The flow guiding assembly includes multiple partition plates arranged at equal angles along the circumference of the tank body, with the side of the partition plates closest to the tank body attached to the outer circumferential surface of the tank body.

[0014] The adjacent partition plates are spaced apart to form an airflow channel, which connects the air guide hole and the negative pressure chamber, so that the partition plates can separate the bubbles and allow them to flow through the airflow channel into the negative pressure chamber.

[0015] In at least one embodiment of this application, the tank further includes:

[0016] A one-way breathable membrane is attached to the outer circumferential surface of the tank and contacts the abutting end of the partition plate. The one-way breathable membrane allows air bubbles to escape into the airflow channel and prevents gypsum slurry from seeping into the airflow channel.

[0017] In at least one embodiment of this application, the airflow channel has a first end and a second end connected to the first end, the first end being located at the end of the airflow channel close to the tank body, and the second end being located at the end of the airflow channel away from the tank body;

[0018] Wherein, along the radial extension direction of the airflow channel, the cross-sectional area of ​​the first end is smaller than the cross-sectional area of ​​the second end.

[0019] In at least one embodiment of this application, the flow guiding component has an annular hoop;

[0020] Multiple partition plates are arranged in a circle on the side away from the outer periphery of the tank, forming an annular flow guide boundary. The annular hoop is coaxially arranged with the annular flow guide boundary and is fitted around the outer periphery of the annular flow guide boundary to bind and fix the multiple partition plates as they move closer to the tank.

[0021] In at least one embodiment of this application, the eccentric device further includes:

[0022] An evacuation device is connected to the rotating shaft along the axial extension direction of the rotating shaft and rotates coaxially with the rotating shaft;

[0023] The evacuation device includes an evacuation tank and at least one suction pipe. One end of the suction pipe is connected to the evacuation tank, and the other end is connected to the negative pressure tank, so that the suction air flows through the negative pressure chamber into the evacuation tank.

[0024] In at least one embodiment of this application, the negative pressure extraction mechanism further includes:

[0025] A driving device, disposed adjacent to the eccentric device, is used to drive the rotating shaft to rotate;

[0026] The driving device includes:

[0027] Drive components;

[0028] An output shaft, the axis of which is parallel to the axis of the rotating shaft and is drivenly connected to the driving component;

[0029] The drive belt is fitted onto the output shaft at one end and onto the mounting bracket at the other end.

[0030] In at least one embodiment of this application, the mounting bracket has a first mounting position and at least one second mounting position. The first mounting position is located on the central axis of the mounting bracket, and the second mounting position is circumferentially arranged around the first mounting position. The negative pressure tank is embedded in the second mounting position, and the evacuation tank is embedded in the first mounting position.

[0031] In at least one embodiment of this application, the outer peripheral surface of the output shaft is provided with a first synchronous tooth that meshes with the drive belt, and the outer peripheral surface of the mounting bracket is provided with a second synchronous tooth that meshes with the drive belt, wherein the tooth pitch of the first synchronous tooth and the second synchronous tooth is equal.

[0032] In at least one embodiment of this application, the flow guiding component is provided with an arc-shaped locking block on the side facing the top of the negative pressure tank, and an annular groove adapted to the arc-shaped locking block is opened on the inner wall of the top of the negative pressure tank, and the arc-shaped locking block is embedded in the annular groove.

[0033] The negative pressure extraction mechanism of the gold mold described above contains foamed gypsum in a tank with air vents. An eccentric device drives the tank to rotate eccentrically. Under the action of centrifugal force, the slurry moves towards the first accumulation zone, and the air bubbles are forced to the second accumulation zone due to the density difference. They are then discharged into the negative pressure chamber through the air vents. By combining centrifugal force to actively separate the air bubbles with negative pressure to extract the air bubbles in the gypsum slurry, the transformation from "dispersed distribution" to "concentrated aggregation" is achieved. The aggregated air bubbles are quickly connected to the negative pressure chamber through a dedicated air vent and are discharged more quickly using dual power, thus solving the problem of quickly extracting air bubbles from the gypsum slurry. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the negative pressure extraction mechanism of a gold mold in an embodiment of this application.

[0035] Figure 2 This is a schematic diagram of the negative pressure tank.

[0036] Figure 3 This is a top-down structural diagram of the negative pressure tank.

[0037] Figure 4 This is a schematic diagram of the tank's structure.

[0038] Figure 5 This is a schematic diagram of the structure of the first and second accumulation zones inside the tank.

[0039] Explanation of key component symbols:

[0040] 100. A negative pressure extraction mechanism for a gold mold; 10. Tank body; 10a. Air guide hole; 11. Flow guide assembly; 111. Divider plate; 112. Airflow channel; 1121. First end; 1122. Second end; 113. Annular hoop; 12. One-way breathable membrane; 13. First accumulation zone; 14. Second accumulation zone; 20. Eccentric device; 30. Rotating shaft; 31. Second synchronous gear; 40. Mounting bracket; 41. Negative pressure tank; 42. First mounting position; 43. Second mounting position; 411. Negative pressure chamber; 50. Vacuuming device; 51. Air extraction pipe; 52. Vacuuming tank; 60. Drive device; 61. Drive component; 62. Output shaft; 63. Drive belt; 621. First synchronous gear. Detailed Implementation

[0041] The embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0042] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have an intervening component. When a component is considered to be "placed" on another component, it can be directly placed on the other component or may also have an intervening component. The terms "top," "bottom," "upper," "lower," "left," "right," "front," "back," and similar expressions used in this article are for illustrative purposes only.

[0043] Embodiments of this application provide a negative pressure extraction mechanism for a gold mold, comprising:

[0044] The tank is filled with foamed gypsum, and air vents are provided on the outer circumferential surface of the tank.

[0045] An eccentric device includes a rotating shaft and a mounting bracket that rotates about the rotating shaft. The mounting bracket has at least one negative pressure tank, and a negative pressure cavity is formed inside the negative pressure tank. The tank body is disposed inside the negative pressure cavity.

[0046] The tank body has a first accumulation zone and a second accumulation zone that are sequentially close to the rotating axis.

[0047] When the tank rotates around the rotating axis, the gypsum slurry in the foamed gypsum moves towards the first accumulation zone under the action of centrifugal force, and the gypsum slurry pushes the air bubbles towards the second accumulation zone, so that the air bubbles in the second accumulation zone are discharged into the negative pressure chamber through the air guide hole.

[0048] The negative pressure extraction mechanism of the gold mold described above contains foamed gypsum in a tank with air vents. An eccentric device drives the tank to rotate eccentrically. Under the action of centrifugal force, the slurry moves towards the first accumulation zone, and the air bubbles are forced to the second accumulation zone due to the density difference. They are then discharged into the negative pressure chamber through the air vents. By combining centrifugal force to actively separate the air bubbles with negative pressure to extract the air bubbles in the gypsum slurry, the transformation from "dispersed distribution" to "concentrated aggregation" is achieved. The aggregated air bubbles are quickly connected to the negative pressure chamber through a dedicated air vent and are discharged more quickly using dual power, thus solving the problem of quickly extracting air bubbles from the gypsum slurry.

[0049] The following detailed description of some embodiments of this application is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0050] according to Figures 1-5 This application provides a negative pressure extraction mechanism 100 for a gold mold, including: a tank 10 and an eccentric device 20.

[0051] The tank 10 is filled with foamed gypsum, and a vent hole 10a is provided on the outer circumferential surface of the tank 10. The eccentric device 20 includes a rotating shaft 30 and a mounting frame 40 that rotates around the rotating shaft 30. The mounting frame 40 has at least one negative pressure tank 41, and a negative pressure chamber 411 is formed inside the negative pressure chamber 411. A first accumulation zone 13 and a second accumulation zone 14 are formed within the tank 10, sequentially adjacent to the rotating shaft 30. When the tank 10 rotates around the rotating shaft 30, the gypsum slurry in the foamed gypsum moves towards the first accumulation zone 13 under centrifugal force, and the gypsum slurry pushes air bubbles towards the second accumulation zone 14, so that the air bubbles in the second accumulation zone 14 are discharged into the negative pressure chamber 411 through the vent hole 10a.

[0052] It should be noted that the foamed gypsum is a gypsum slurry in a fluid or semi-fluid state. The mounting frame 40 provides an installation site for the negative pressure tank 41, and a rotating shaft 30 is installed at its central origin, causing the mounting frame 40 to rotate around the central point of the rotating shaft 30. At least one negative pressure tank 41 mounted on the mounting frame 40 moves synchronously around the rotating shaft 30 as the mounting frame 40 rotates, thus forming a motion trajectory around the rotating shaft 30. In the embodiment of the application, the mounting frame 40 is a ring-shaped structure.

[0053] Specifically, the tank 10 serves as a container for the foamed gypsum, providing a closed space for the gypsum slurry and ensuring that the gypsum slurry can move directionally towards the first accumulation zone 13 under centrifugal force. The air guide hole 10a on the outer circumference of the tank 10 is a channel for air bubbles to escape, allowing the air bubbles accumulated in the second accumulation zone 14 to move from inside the tank 10 to the negative pressure chamber 411 outside the tank 10 through the air guide hole 10a, thus solving the problem of air bubble discharge.

[0054] Furthermore, the rotating shaft 30 provides rotational power to the eccentric device 20, and the mounting bracket 40 is used to fix the negative pressure tank 41 and drive the negative pressure tank 41 and the internal tank body 10 to rotate synchronously around the rotating shaft 30, thereby generating centrifugal force, which in turn generates centrifugal force within the tank body 10. Since the density of the gypsum slurry is greater than that of the air bubbles, under the action of centrifugal force, the gypsum slurry will move away from the rotating shaft 30, i.e., towards the first accumulation zone 13, while the air bubbles, due to their lower density, are pushed by the gypsum slurry to a region relatively closer to the rotating shaft 30, i.e., the second accumulation zone 14. This achieves the separation of air bubbles from the gypsum slurry, solving the problems of gas dispersion and encapsulation in the prior art, and accelerating bubble aggregation through active separation by centrifugal force.

[0055] Furthermore, the negative pressure tank 41 forms a closed cavity structure, with the internal negative pressure chamber 411 providing a pressure environment lower than that inside the tank body 10. The negative pressure effect of the negative pressure chamber 411 generates an outward suction force on the bubbles inside the tank body 10, which, combined with centrifugal force, pushes the bubbles towards the second accumulation zone 14 and out through the air guide hole 10a, enhancing the exhaust power. At the same time, the negative pressure tank 41 accommodates the tank body 10, ensuring the stability of the negative pressure environment and avoiding interference from external air pressure.

[0056] It should be noted that the outer circumferential surface of the tank body 10 is provided with a plurality of evenly arranged air guide holes 10a, and the diameter of each air guide hole 10a is equal.

[0057] Furthermore, under centrifugal force, the compression and relative motion between slurry particles generate shear force, which can break the slurry coating around the bubbles. As the shear force increases, the viscosity decreases, making it easier for the bubbles to detach from the slurry. At the same time, the collision and compression between slurry particles generate local high-pressure zones. This dynamic pressure fluctuation disrupts the surface tension of the bubbles. Under centrifugal force, a density gradient field is formed inside the tank 10 containing gypsum slurry. The slurry density is high and the pressure is high in the first accumulation zone 13, which is far from the rotation axis 30, while the slurry density is low and the pressure is low in the second accumulation zone 14. This pressure difference creates a directional migration force, pushing the extruded bubbles from the high-pressure zone to the low-pressure zone, that is, from the first accumulation zone 13 to the second accumulation zone 14, preventing the bubbles from being encapsulated by the slurry again. Simultaneously, the negative pressure environment in the negative pressure chamber 411 generates an outward suction force on the bubbles, forming an internal and external pressure difference with the thrust of the slurry. This accelerates the bubbles from detaching from the slurry and entering the negative pressure chamber 411 through the air guide hole 10a, completely preventing the bubbles from remaining in the tank 10.

[0058] Under the combined action of the thrust of the slurry and the suction of the negative pressure chamber 411, the air bubbles in the second accumulation zone 14 rapidly enter the negative pressure chamber 411 through the air guide hole 10a on the outer periphery of the tank 10, ultimately achieving degassing of the gypsum slurry inside the tank 10. The negative pressure environment and centrifugal force work together to accelerate the discharge of air bubbles from the air guide hole 10a.

[0059] In one specific embodiment, the negative pressure tank 41 also includes a flow guiding component 11.

[0060] The flow guiding component 11 is spaced apart from the inner wall of the negative pressure tank 41 to form a negative pressure chamber 411. The flow guiding component 11 includes a plurality of partition plates 111 arranged at equal angles along the circumference of the tank body 10. The side of the partition plate 111 closest to the tank body 10 is attached to the outer circumferential surface of the tank body 10. Adjacent partition plates 111 are spaced apart to form an airflow channel 112. The airflow channel 112 connects the air guide hole 10a and the negative pressure chamber 411 so that the partition plate 111 divides the air bubbles and allows them to flow through the airflow channel 112 into the negative pressure chamber 411.

[0061] Specifically, the flow guiding component 11 is used to guide the discharge path of the bubbles, thereby increasing the flow velocity of the bubbles into the negative pressure chamber 411 through directional flow guidance. The gap space ensures the sealing of the negative pressure tank 41 to maintain the negative pressure environment, and also provides installation space for the flow guiding component 11.

[0062] Furthermore, the equal-angle arrangement ensures that the partition plates 111 are evenly distributed around the circumference of the tank 10, covering the air guide holes 10a on the entire outer circumference of the tank 10. This ensures that the air bubbles in the tank 10 can be discharged from the air guide holes 10a in different directions, and that the extension direction of the partition plates 111 and the air bubbles discharged from the air guide holes 10a flow with the negative pressure chamber 411, reducing airflow resistance.

[0063] Furthermore, while the partition plate 111 abuts against the outer peripheral surface of the tank body 10, it also abuts against the air guide hole 10a, thereby dividing the air guide hole 10a. The thickness of each partition plate 111 pressing against the tank body 10 is less than the diameter of the air guide hole 10a, and each air guide hole 10a is abutted and divided by at least one partition plate 111. After the bubbles are discharged from the air guide hole 10a, the larger bubbles discharged from the air guide hole 10a are divided into smaller bubbles. The smaller bubbles are more easily adsorbed by negative pressure in the airflow channel 112, and the flow resistance is smaller.

[0064] In one specific embodiment, the tank 10 further includes a one-way breathable membrane 12, which is attached to the outer peripheral surface of the tank 10 and contacts the abutting end of the partition plate 111. The one-way breathable membrane 12 allows air bubbles to be discharged into the airflow channel 112 and prevents gypsum slurry from seeping into the airflow channel 112.

[0065] Specifically, the one-way breathable membrane 12 acts as an interface barrier between the tank 10 and the external airflow channel 112, directly covering the air guide hole 10a area on the outer peripheral surface of the tank 10, forming a selective permeable layer for gas discharge. The fit between the one-way breathable membrane 12 and the tank 10 ensures close contact between the one-way breathable membrane 12 and the surface of the tank 10, preventing air bubbles from leaking from the gap between the membrane and the tank 10, while also preventing gypsum slurry from seeping out from the edge of the air guide hole 10a under centrifugal force.

[0066] Furthermore, the abutting end of the partition plate 111 is the side of the partition plate 111 closest to the outer peripheral surface of the tank body 10, and abuts against the outer peripheral surface of the tank body 10. The one-way breathable membrane 12 contacts the abutting end of the partition plate 111 to form a secondary seal. The pressure of the partition plate 111 presses the membrane tightly against the surface of the tank body 10, enhancing the adhesion between the one-way breathable membrane 12 and the outer peripheral surface of the tank body 10; at the same time, it prevents the gypsum slurry inside the tank body 10 from being eroded and worn by the slurry under centrifugal force and the thrust of gypsum particles, thereby protecting the tank body 10.

[0067] Furthermore, under the influence of pushing force and negative pressure suction, the bubbles move towards the vent 10a and come into contact with the one-way breathable membrane 12 adhered to the surface of the tank 10. Since the membrane only allows gas to pass through, the bubbles can penetrate the membrane and enter the area between the membrane and the partition plate 111; while the gypsum slurry is blocked by the liquid-repellent properties of the one-way breathable membrane 12 and cannot seep out from the vent 10a. The bubbles that have passed through the one-way breathable membrane 12 are broken up by the partition plate 111 pressed against the vent 10a, and flow along the partition plate 111 from the airflow channel 112 to the negative pressure chamber 411 under the action of negative pressure, and are finally discharged.

[0068] In one specific embodiment, the airflow channel 112 has a first end 1121 and a second end 1122 connected to the first end 1121. The first end 1121 is located at one end of the airflow channel 112 near the tank 10, and the second end 1122 is located at one end of the airflow channel 112 away from the tank 10. In the radial extension direction of the airflow channel 112, the cross-sectional area of ​​the first end 1121 is smaller than the cross-sectional area of ​​the second end 1122.

[0069] Specifically, the first end 1121 is the inlet end of the bubble entering the channel, and the second end 1122 is the outlet end of the bubble leaving the channel, so that the flow path of the bubble forms a directional trajectory from near the tank 10 to far from the tank 10.

[0070] Each partition plate 111 forms an equal-angle airflow channel 112, and along the radial extension direction of the airflow channel 112, when the bubbles are just discharged from the air guide hole 10a, they are in a relatively concentrated state in the first end 1121. The small cross-sectional area of ​​the inlet can form an initial constraint on the bubbles. In the same sealed cavity, under the same flow rate, the smaller the cross-sectional area, the higher the gas velocity, so that the bubbles in the tank 10 can be quickly discharged to the negative pressure chamber 411.

[0071] The bubble moves radially away from the tank 10, transitioning from the first end 1121 to the second end 1122 into a gradually expanding region with a gradually increasing cross-sectional area. At this time, the pressure in the airflow channel 112 decreases as the cross-sectional area increases, forming a pressure gradient from the inlet to the outlet. Under the action of this gradient, the bubble is continuously pulled towards the second end 1122.

[0072] In one specific embodiment, the flow guiding assembly 11 has an annular hoop 113; the sides of the multiple partition plates 111 away from the outer peripheral surface of the tank body 10 are cocircular and form an annular flow guiding boundary, the annular hoop 113 is coaxially arranged with the annular flow guiding boundary, and the annular hoop 113 is sleeved on the outer periphery of the annular flow guiding boundary to bind and fix the multiple partition plates 111 as they move close to the tank body 10.

[0073] Specifically, the annular hoop 113 is an annular structural component that serves to fix and limit the multiple partition plates 111 surrounding the tank body 10.

[0074] Furthermore, when the partition plate 111 rotates at high speed with the tank body 10, the end away from the rotation axis 30 will expand outward due to the centrifugal force and the squeezing force between the gypsum slurry particles. The expansion of the partition plate 111 is counteracted by the binding force of the annular hoop 113, ensuring the structural stability of the flow guiding assembly 11 and avoiding changes in the size of the airflow channel 112 due to the deformation of the partition plate 111.

[0075] The center of the annular hoop 113 coincides with the center of the annular guide boundary, so that the binding force of the hoop on the partition plate 111 is evenly distributed along the circumference. The radial constraint force on each partition plate 111 is consistent, avoiding the tilting or deformation of the partition plate 111 due to uneven force, thereby enhancing the fit between the partition plate 111 and the one-way breathable membrane 12 on the side of the partition plate 111 that abuts against the outer circumferential surface of the tank body 10.

[0076] In one specific embodiment, the eccentric device 20 further includes: a vacuum device 50, which extends along the axial direction of the rotating shaft 30, is connected to the rotating shaft 30, and rotates coaxially with the rotating shaft 30; the vacuum device 50 includes a vacuum tank 52 and at least one suction pipe 51, one end of the suction pipe 51 is connected to the vacuum tank 52, and the other end is connected to the negative pressure tank 41, so that the suction air bubbles flow into the vacuum tank 52 through the negative pressure chamber 411.

[0077] Specifically, the evacuation tank 52 is used to collect airflow from the negative pressure tank 41, and a vacuum environment lower than that of the negative pressure chamber 411 can be formed inside the evacuation tank 52. Through the pressure difference, the active suction force draws in the air bubbles in the negative pressure chamber 411 and stores them temporarily. The suction pipe 51 is a transport channel for drawing airflow from the negative pressure tank 41 to the evacuation tank 52, and its diameter is designed according to the volume of the negative pressure chamber 411 and the expected suction rate.

[0078] It should be noted that the number of suction pipes 51 corresponds to the number of negative pressure tanks 41, ensuring that the negative pressure chamber 411 of each negative pressure tank 41 can obtain independent and balanced suction force.

[0079] In one specific embodiment, the negative pressure extraction mechanism further includes a driving device 60, which is disposed adjacent to the eccentric device 20 and is used to drive the rotating shaft 30 to rotate.

[0080] The drive device 60 includes a drive member 61, an output shaft 62 and a drive belt 63. The axis of the output shaft 62 is parallel to the axis of the rotating shaft 30 and is drivenly connected to the drive member 61. One end of the drive belt 63 is sleeved on the output shaft 62 and the other end is sleeved on the mounting bracket 40.

[0081] Specifically, the drive component 61 provides driving force, which can be any type of motor, such as a servo motor or stepper motor, and drives the output shaft 62 to rotate through the output torque. The output shaft 62 transmits the rotational motion output by the drive component 61 to the drive belt 63, thereby causing the rotating shaft 30 connected to the drive belt 63 to rotate. At the same time, the axis parallel to the rotating shaft 30 ensures that the direction of power transmission is consistent with the rotation direction of the eccentric device 20. The drive belt 63 drives the mounting frame 40 and the negative pressure tank 41 and tank body 10 it supports to rotate together.

[0082] It should be noted that the driving belt 63 and the output shaft 62, as well as the side that is sleeved on the mounting bracket 40, can increase the friction through meshing, so that the output shaft 62 can synchronously transmit the rotational motion to the rotating shaft 30 through the driving belt 63, and also ensure that the rotational speed of each tank 10 is consistent.

[0083] In one specific embodiment, the mounting bracket 40 has a first mounting position 42 and at least one second mounting position 43. The first mounting position 42 is located on the central axis of the mounting bracket 40, and the second mounting position 43 is arranged circumferentially around the first mounting position 42. The negative pressure tank 41 is embedded in the second mounting position 43, and the vacuum tank 52 is embedded in the first mounting position 42.

[0084] Specifically, the first mounting position 42 and the second mounting position 43 are mounting holes opened on the mounting bracket 40. In this embodiment, the first mounting position 42 is the center point on the mounting bracket 40, and the diameter of the hole in the first mounting position 42 matches that of the evacuation tank 52. The evacuation tank 52 can be fixed on the mounting bracket 40 by welding between the first mounting position 42 and the evacuation tank 52.

[0085] It should be noted that the number of at least one negative pressure tank 41 can be set as needed. When the rotating shaft 30 rotates, multiple negative pressure tanks 41 mounted on the mounting frame 40 are arranged circumferentially around the rotating shaft 30. The second mounting position 43 is arranged circumferentially around the first mounting position 42, so that the distance from all negative pressure tanks 41 to the rotating shaft 30 is equal, thereby ensuring that the negative pressure tanks 41 mounted on the mounting frame 40 are subjected to the same rotational speed when the rotating shaft 30 rotates. Furthermore, the centrifugal force on the gypsum slurry in the tank body 10 of each negative pressure tank 41 is completely consistent, ensuring the uniformity of the bubble separation effect when multiple tanks are processed simultaneously, and avoiding incomplete venting of some tanks 10 due to positional deviations.

[0086] In one specific embodiment, the outer peripheral surface of the output shaft 62 is provided with a first synchronous tooth 621 that meshes with the drive belt 63, and the outer peripheral surface of the mounting bracket 40 is provided with a second synchronous tooth 31 that meshes with the drive belt 63. The tooth pitch of the first synchronous tooth 621 and the second synchronous tooth 31 is equal.

[0087] Specifically, the output shaft 62 and the drive belt 63 are connected by a toothed structure to form a meshing connection, which transmits the rotational motion of the output shaft 62 to the drive belt 63 in a mechanical meshing manner. The drive belt 63 receives power through meshing with the rotating shaft 30, and converts the motion of the drive belt 63 into the rotational motion of the mounting bracket 40. The tooth pitch of the first synchronous tooth 621 and the second synchronous tooth 31 is equal, which ensures that the tooth profiles of the first synchronous tooth 621, the drive belt 63, and the second synchronous tooth 31 are matched, forming a backlash-free meshing transmission pair, ensuring that there is no tooth interference or idle stroke during power transmission.

[0088] In one specific embodiment, the flow guiding component 11 is provided with an arc-shaped locking block on the side facing the top of the negative pressure tank 41, and an annular groove adapted to the arc-shaped locking block is opened on the inner wall of the top of the negative pressure tank 41, and the arc-shaped locking block is embedded in the annular groove.

[0089] Specifically, the arc-shaped locking block serves as the connection and positioning structure between the flow guiding component 11 and the top of the negative pressure tank 41. The curved shape of the arc-shaped locking block is adapted to the annular locking groove, and the top of the flow guiding component 11 is fixed by embedding, limiting the radial and circumferential displacement of the flow guiding component 11. This prevents it from moving due to centrifugal force during high-speed rotation, ensures the fit between the partition plate 111 and the outer circumferential surface of the tank body 10, guarantees the sealing of the airflow channel 112, and prevents air bubbles from leaking from the gaps.

[0090] Therefore, the negative pressure extraction mechanism 100 of the gold mold provided above contains foamed gypsum in a tank 10 and has an air vent 10a. The eccentric device 20 drives the tank 10 to rotate eccentrically. Under the action of centrifugal force, the slurry moves to the first accumulation zone 13. Due to the density difference, the air bubbles are forced to the second accumulation zone 14 and discharged into the negative pressure chamber 411 through the air vent 10a. By combining the active separation of centrifugal force with the synergistic extraction of air bubbles in the gypsum slurry, the transformation from "dispersed distribution" to "concentrated aggregation" is achieved. The aggregated air bubbles are quickly connected to the negative pressure chamber 411 through the dedicated air vent 10a and discharged by dual power, thereby solving the problem of quickly extracting air bubbles from the gypsum slurry.

[0091] The above description is merely an embodiment of this application. It should be noted that those skilled in the art can make improvements without departing from the inventive concept of this application, but these improvements all fall within the protection scope of this application.

Claims

1. A negative pressure extraction mechanism for a gold mold, characterized in that, include: The tank is filled with foamed gypsum, and air vents are provided on the outer circumferential surface of the tank. An eccentric device includes a rotating shaft and a mounting bracket that rotates about the rotating shaft. The mounting bracket has at least one negative pressure tank, and a negative pressure cavity is formed inside the negative pressure tank. The tank body is disposed inside the negative pressure cavity. The negative pressure tank also contains: A flow guiding component is provided with a gap between it and the circumferential inner wall of the negative pressure tank to form the negative pressure cavity; The flow guiding assembly includes multiple partition plates arranged at equal angles along the circumference of the tank body, with the side of the partition plates closest to the tank body attached to the outer circumferential surface of the tank body. The adjacent partition plates are spaced apart to form an airflow channel, which connects the air guide hole and the negative pressure chamber, so that the partition plates can separate the air bubbles and allow them to flow through the airflow channel into the negative pressure chamber. The tank also includes: A one-way breathable membrane is attached to the outer circumferential surface of the tank and contacts the abutting end of the partition plate. The one-way breathable membrane allows air bubbles to escape into the airflow channel and prevents gypsum slurry from seeping into the airflow channel. The tank body has a first accumulation zone and a second accumulation zone that are sequentially close to the rotating axis. When the tank rotates around the rotating axis, the gypsum slurry in the foamed gypsum moves towards the first accumulation zone under the action of centrifugal force, and the gypsum slurry pushes the air bubbles towards the second accumulation zone, so that the air bubbles in the second accumulation zone are discharged into the negative pressure chamber through the air guide hole.

2. The negative pressure extraction mechanism for a gold mold according to claim 1, characterized in that, The airflow channel has a first end and a second end connected to the first end, the first end being located at the end of the airflow channel close to the tank body, and the second end being located at the end of the airflow channel away from the tank body; Wherein, along the radial extension direction of the airflow channel, the cross-sectional area of ​​the first end is smaller than the cross-sectional area of ​​the second end.

3. The negative pressure extraction mechanism for a gold mold according to claim 1, characterized in that, The flow guiding component has an annular hoop; Multiple partition plates are arranged in a circle on the side away from the outer periphery of the tank, forming an annular flow guide boundary. The annular hoop is coaxially arranged with the annular flow guide boundary and is fitted around the outer periphery of the annular flow guide boundary to bind and fix the multiple partition plates as they move closer to the tank.

4. The negative pressure extraction mechanism of a gold mold according to claim 1, wherein The eccentric device further includes: An evacuation device is connected to the rotating shaft along the axial extension direction of the rotating shaft and rotates coaxially with the rotating shaft; The evacuation device includes an evacuation tank and at least one suction pipe. One end of the suction pipe is connected to the evacuation tank, and the other end is connected to the negative pressure tank, so that the suction air flows through the negative pressure chamber into the evacuation tank.

5. The negative pressure extraction mechanism of a gold mold according to claim 1, wherein The negative pressure extraction mechanism also includes: A driving device, disposed adjacent to the eccentric device, is used to drive the rotating shaft to rotate; The driving device includes: Drive components; An output shaft, the axis of which is parallel to the axis of the rotating shaft and is drivenly connected to the driving component; The drive belt is fitted onto the output shaft at one end and onto the mounting bracket at the other end.

6. A negative pressure extraction mechanism for a gold mold according to claim 4, wherein The mounting bracket has a first mounting position and at least one second mounting position. The first mounting position is located on the central axis of the mounting bracket, and the second mounting position is arranged circumferentially around the first mounting position. The negative pressure tank is embedded in the second mounting position, and the vacuum tank is embedded in the first mounting position.

7. A negative pressure extraction mechanism for a gold mold according to claim 5, wherein The outer peripheral surface of the output shaft is provided with a first synchronous tooth that meshes with the drive belt, and the outer peripheral surface of the mounting bracket is provided with a second synchronous tooth that meshes with the drive belt. The tooth pitch of the first synchronous tooth and the second synchronous tooth is equal.

8. The negative pressure extraction mechanism of a gold mold according to claim 1, wherein, The flow guiding component has an arc-shaped locking block on the side facing the top of the negative pressure tank. The inner wall of the top of the negative pressure tank has an annular groove that matches the arc-shaped locking block, and the arc-shaped locking block is embedded in the annular groove.

Images