Negative pressure pumping and discharging mechanism of gold mold

Abstract

According to the negative-pressure pumping and discharging mechanism of the gold mold, the tank body is used for containing foam coagulation gypsum and is provided with the air guide hole, the eccentric device drives the tank body to eccentrically rotate, under the action of centrifugal force, slurry moves towards the first accumulation area, bubbles are forcibly pushed to the second accumulation area due to the density difference and are discharged into the negative-pressure cavity through the air guide hole, and the negative-pressure pumping and discharging effect is achieved. By combining active separation of centrifugal force and cooperative suction of bubbles in gypsum slurry with negative pressure, the conversion from'dispersed distribution 'to'concentrated gathering' is realized, the gathered bubbles are quickly communicated with a negative pressure cavity through an exclusive air guide hole, and the bubbles are quickly discharged by utilizing dual power in an accelerated manner, so that the purpose of quickly extracting the bubbles in the gypsum slurry can be realized.

Description

Technical Field

[0001] The present application relates to the field of gypsum molds, and in particular to a negative pressure exhaust mechanism for gold molds. Background Art

[0002] Gold molds are widely used in the precision casting field (especially in the manufacture of high-precision products such as jewelry and dentistry). The core of this process is to inject gypsum slurry into the mold cavity to form the product. During the injection molding process, the gypsum slurry must be fully degassed before solidification to ensure uniform and dense filling within the mold, thereby avoiding defects such as porosity and shrinkage in the finished product. However, the high value of gold places strict demands on mold forming accuracy. Even the slightest residual gas can render the casting scrapped. Therefore, the efficiency of gas removal directly determines production yield and cost.

[0003] To address the issue of bubbles within the gypsum slurry, existing technologies rely on vacuuming. This involves placing the mold in a sealed chamber and extracting the gas using an external vacuum pump. However, this method consumes a lot of energy and requires a long vacuuming cycle. The gas is dispersed within the gypsum slurry, and some gas is trapped within the gypsum slurry, making it difficult to extract quickly and effectively. This results in a time-consuming vacuuming process.

[0004] Therefore, it is necessary to provide a negative pressure exhaust mechanism for a gold mold that can quickly extract bubbles from the gypsum slurry. Summary of the Invention

[0005] In view of this, it is necessary to provide a negative pressure exhaust mechanism for a gold mold that can quickly extract bubbles from the gypsum slurry to solve the above problems.

[0006] An embodiment of the present application provides a negative pressure exhaust mechanism for a gold mold, comprising:

[0007] The tank body is filled with foamed gypsum, and the outer peripheral surface of the tank body is provided with air guide holes;

[0008] The eccentric device includes a rotating shaft and a mounting frame rotating about the rotating shaft, the mounting frame is provided with at least one negative pressure tank, the negative pressure tank has a negative pressure cavity defined therein, and the tank body is disposed in the negative pressure cavity;

[0009] A first accumulation area and a second accumulation area are formed in the tank body, which are sequentially away from the rotating axis;

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

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

[0012] a flow guide assembly, arranged with a gap between the circumferential inner wall of the negative pressure tank to form the negative pressure cavity;

[0013] The guide assembly includes a plurality of partition plates arranged at equal angles and diverging along the circumference of the tank body. The side of the partition plate close to the tank body is attached to the outer peripheral surface of the tank body.

[0014] Adjacent partition plates are spaced apart to form an airflow channel, and the airflow channel connects the air guide hole and the negative pressure chamber, so that the partition plates divide the bubbles and the bubbles flow into the negative pressure chamber along the airflow channel.

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

[0016] A one-way breathable membrane is attached to the outer peripheral surface of the tank body and contacts the abutting end of the partition plate. The one-way breathable membrane allows bubbles to be discharged into the air flow channel and blocks gypsum slurry from seeping into the air flow channel.

[0017] In at least one embodiment of the present application, the air flow channel has a first end and a second end connected to the first end, the first end is provided at an end of the air flow channel close to the tank body, and the second end is provided at an end of the air flow 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 the present application, the diversion assembly has an annular hoop;

[0020] The multiple partition plates are cocircular on one side away from the outer peripheral surface of the tank body and form an annular guide boundary. The annular hoop is coaxially arranged with the annular guide boundary, and the annular hoop is sleeved on the outer periphery of the annular guide boundary to bundle and fix the multiple partition plates so that they move close to the tank body.

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

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

[0023] The vacuum device includes a vacuum tank and at least one vacuum pipe, one end of the vacuum pipe is connected to the vacuum tank, and the other end is connected to the negative pressure tank, so that the suction bubbles flow into the vacuum tank through the negative pressure cavity.

[0024] In at least one embodiment of the present application, the negative pressure exhaust mechanism further comprises:

[0025] a driving device, disposed adjacent to the eccentric device and configured to drive the rotating shaft to rotate;

[0026] The driving device comprises:

[0027] driving parts;

[0028] an output shaft, the axis of the output shaft being parallel to the axis of the rotating shaft and being drivingly connected to the driving member;

[0029] One end of the driving belt is sleeved on the output shaft, and the other end is sleeved on the mounting frame.

[0030] In at least one embodiment of the present application, the mounting frame has a first mounting position and at least one second mounting position, the first mounting position is arranged on the central axis of the mounting frame, 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 vacuum tank is embedded in the first mounting position.

[0031] In at least one embodiment of the present application, the outer circumference of the output shaft is provided with a first synchronous tooth engaged with the drive belt, and the outer circumference of the mounting frame is provided with a second synchronous tooth engaged with the drive belt, and the tooth pitch of the first synchronous tooth is equal to that of the second synchronous tooth.

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

[0033] The above-mentioned negative pressure extraction mechanism for the gold mold contains the foamed gypsum in a tank body and opens an air guide hole. The eccentric device drives the tank body to rotate eccentrically. Under the action of centrifugal force, the slurry moves toward the first accumulation area. The bubbles are forced to be pushed to the second accumulation area due to the density difference and discharged into the negative pressure cavity through the air guide hole. By combining the active separation of centrifugal force and the coordinated extraction of bubbles in the gypsum slurry with negative pressure, the transition from "dispersed distribution" to "concentrated aggregation" is realized. The gathered bubbles are quickly connected to the negative pressure cavity through the exclusive air guide hole, and are accelerated to be discharged by using dual power, thereby realizing the problem of quickly extracting the bubbles in the gypsum slurry. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a structural schematic diagram of a negative pressure exhaust mechanism for a gold mold in an embodiment of the present application.

[0035] Figure 2 It is a structural diagram of the negative pressure tank.

[0036] Figure 3 It is a schematic diagram of the structure of the negative pressure tank from above.

[0037] Figure 4 Schematic diagram of the tank structure.

[0038] Figure 5 It is a schematic diagram of the structure of the first stacking area and the second stacking area in the tank body.

[0039] Description of main component symbols:

[0040] 100. A negative pressure exhaust mechanism for a gold mold; 10. A tank body; 10a. An air guide hole; 11. A flow guide assembly; 111. A partition plate; 112. An air flow channel; 1121. A first end; 1122. A second end; 113. An annular hoop; 12. A one-way breathable membrane; 13. A first stacking area; 14. A second stacking area; 20. An eccentric device; 30. A rotating shaft; 31. A second synchronous tooth; 40. A mounting bracket; 41. A negative pressure tank; 42. A first mounting position; 43. A second mounting position; 411. A negative pressure chamber; 50. An evacuation device; 51. An exhaust pipe; 52. An evacuation tank; 60. A driving device; 61. A driving member; 62. An output shaft; 63. A driving belt; 621. A first synchronous tooth. DETAILED DESCRIPTION

[0041] The embodiments of the present application will be 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, rather than all the 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 there may be an intermediate component. When a component is considered to be "disposed on" another component, it can be directly disposed on the other component or there may be an intermediate component. The terms "top", "bottom", "upper", "lower", "left", "right", "front", "back", and similar expressions used herein are for illustrative purposes only.

[0043] An embodiment of the present application provides a negative pressure exhaust mechanism for a gold mold, comprising:

[0044] The tank body is filled with foamed gypsum, and the outer peripheral surface of the tank body is provided with air guide holes;

[0045] The eccentric device includes a rotating shaft and a mounting frame rotating about the rotating shaft, the mounting frame is provided with at least one negative pressure tank, the negative pressure tank has a negative pressure cavity defined therein, and the tank body is disposed in the negative pressure cavity;

[0046] A first accumulation area and a second accumulation area are formed in the tank body, which are sequentially away from the rotating axis;

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

[0048] The above-mentioned negative pressure extraction mechanism for the gold mold contains the foamed gypsum in a tank body and opens an air guide hole. The eccentric device drives the tank body to rotate eccentrically. Under the action of centrifugal force, the slurry moves toward the first accumulation area. The bubbles are forced to be pushed to the second accumulation area due to the density difference and discharged into the negative pressure cavity through the air guide hole. By combining the active separation of centrifugal force and the coordinated extraction of bubbles in the gypsum slurry with negative pressure, the transition from "dispersed distribution" to "concentrated aggregation" is realized. The gathered bubbles are quickly connected to the negative pressure cavity through the exclusive air guide hole, and are accelerated to be discharged by using dual power, thereby realizing the problem of quickly extracting the bubbles in the gypsum slurry.

[0049] The following embodiments of the present application are described in detail with reference to the accompanying drawings. In the absence of conflict, the following embodiments and features therein may be combined with each other.

[0050] according to Figure 1-Figure 5 In an embodiment of the present application, a negative pressure exhaust mechanism 100 for a gold mold is provided, comprising: a tank body 10 and an eccentric device 20.

[0051] The tank body 10 is filled with foamed gypsum, and an air guide hole 10a is formed on the outer circumference of the tank body 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 the negative pressure tank 41 has a negative pressure chamber 411. The tank body 10 is disposed in the negative pressure chamber 411. A first accumulation area 13 and a second accumulation area 14 are formed in the tank body 10, which are respectively distal to the rotating shaft 30. When the tank body 10 rotates around the rotating shaft 30, the gypsum slurry in the foamed gypsum moves toward the first accumulation area 13 under the action of centrifugal force, and the gypsum slurry pushes the bubbles toward the second accumulation area 14, so that the bubbles in the second accumulation area 14 are discharged into the negative pressure chamber 411 through the air guide hole 10a.

[0052] It should be noted that foamed gypsum is a gypsum slurry in a fluid or semi-fluid state. The mounting frame 40 provides a mounting location for the negative pressure tank 41. The rotation axis 30 is mounted at its center, allowing the mounting frame 40 to rotate around the center of the rotation axis 30. When the mounting frame 40 rotates, at least one negative pressure tank 41 mounted on the mounting frame 40 simultaneously moves around the rotation axis 30, thereby forming a motion trajectory around the rotation axis 30. In the embodiment of the application, the mounting frame 40 is a circular ring structure.

[0053] Specifically, the tank body 10 serves as a container for the foamed gypsum, providing a closed space for the gypsum slurry and ensuring that the gypsum slurry can be directed toward the first accumulation area 13 under the action of centrifugal force. The air guide holes 10a on the outer surface of the tank body 10 serve as channels for the discharge of bubbles. These holes allow bubbles accumulated in the second accumulation area 14 to move from the tank body 10 into the negative pressure chamber 411 outside the tank body 10 through the air guide holes 10a, thus solving the problem of bubble discharge.

[0054] Furthermore, the rotating shaft 30 provides rotational power for the eccentric device 20, and the mounting bracket 40 is used to secure the negative pressure tank 41 and drive the negative pressure tank 41 and the internal tank body 10 to rotate synchronously about the rotating shaft 30, thereby generating centrifugal force, which in turn generates centrifugal force within the tank body 10. The density of the gypsum slurry is greater than that of the bubbles. Under the action of centrifugal force, the gypsum slurry moves away from the rotating shaft 30, that is, toward the first accumulation area 13. However, due to their lower density, the bubbles are pushed by the gypsum slurry to an area relatively close to the rotating shaft 30, that is, the second accumulation area 14. This achieves the separation of bubbles from the gypsum slurry, solving the problem of gas dispersion and encapsulation in the prior art. Active separation through centrifugal force accelerates bubble aggregation.

[0055] Furthermore, the negative pressure tank 41 forms a closed cavity structure, with the internal negative pressure chamber 411 providing a lower pressure environment than that within the tank body 10. The negative pressure in the negative pressure chamber 411 creates an outward suction force on the bubbles within the tank body 10. This, combined with centrifugal force, pushes the bubbles toward the second accumulation area 14 and out through the air guide holes 10a, enhancing the exhaust dynamics. Furthermore, the negative pressure tank 41 accommodates the tank body 10, ensuring the stability of the negative pressure environment and preventing external air pressure interference.

[0056] It should be noted that a plurality of evenly arranged air guide holes 10 a are formed on the outer circumference of the tank body 10 , and each of the air guide holes 10 a has a uniform aperture.

[0057] Furthermore, under centrifugal force, the extrusion and relative movement between the slurry particles generate shear force, which can break the slurry coating around the bubbles. When 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 extrusion between the slurry particles will produce a local high-pressure area. This dynamic pressure fluctuation will destroy the surface tension of the bubbles. Under centrifugal force, a density gradient field is formed in the tank body 10 containing gypsum slurry. The slurry in the first accumulation area 13 away from the rotating axis 30 has a high density and high pressure, while the slurry in the second accumulation area 14 has a low density and low pressure. This pressure difference will form a directional migration force, pushing the extruded bubbles from the high-pressure area to the low-pressure area, that is, the bubbles move from the first accumulation area 13 to the second accumulation area 14, preventing the bubbles from being wrapped by the slurry again. At the same time, the negative pressure environment in the negative pressure chamber 411 will generate an outward suction force on the bubbles, forming an internal and external pressure difference with the thrust of the slurry, accelerating the bubbles to detach from the slurry and enter the negative pressure chamber 411 through the air guide hole 10a, completely preventing the bubbles from being retained in the tank body 10.

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

[0059] In a specific embodiment, the negative pressure tank 41 further includes a flow guide component 11 .

[0060] Among them, a gap is set between the guide component 11 and the circumferential inner wall of the negative pressure tank 41 to form a negative pressure chamber 411; the guide component 11 includes a plurality of partition plates 111 arranged at equal angles and diverging along the circumference of the tank body 10, and the partition plates 111 are attached to the outer circumferential surface of the tank body 10 on the side close to the tank body 10, and adjacent partition plates 111 are spaced to form an airflow channel 112, and the airflow channel 112 connects the air guide hole 10a and the negative pressure chamber 411, so that the partition plate 111 divides the bubbles and flows through the airflow channel 112 into the negative pressure chamber 411.

[0061] Specifically, the flow guide assembly 11 is used to guide the exhaust path of the bubbles and increase the flow speed of the bubbles into the negative pressure chamber 411 through directional flow guidance. The gap space not only ensures the sealing of the negative pressure tank 41 to maintain the negative pressure environment, but also provides installation space for the flow guide assembly 11.

[0062] Furthermore, the partition plates 111 are arranged at equal angles so as to be evenly distributed around the tank body 10, covering the air guide holes 10a on the entire outer circumference of the tank body 10, ensuring that the bubbles in the tank body 10 can be discharged from the air guide holes 10a in different directions, so that the extension direction of the partition plates 111 is consistent with the bubbles flowing through the negative pressure chamber 411 after being discharged from the air guide holes 10a, thereby reducing airflow resistance.

[0063] Furthermore, while the partition plates 111 abut the outer circumference of the can body 10, they also abut against the air holes 10a, thereby dividing the air holes 10a. The thickness of each partition plate 111 pressed against the can body 10 is less than the diameter of the air holes 10a, and each air hole 10a abuts and divides at least one partition plate 111. After the bubbles are discharged from the air holes 10a, the larger bubbles discharged from the air holes 10a are divided into smaller bubbles. The smaller bubbles are more easily attracted by the negative pressure in the airflow channel 112, and have less flow resistance.

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

[0065] Specifically, the one-way breathable membrane 12 serves as an interface barrier between the tank body 10 and the external airflow channel 112, directly covering the air guide holes 10a on the outer circumference of the tank body 10 and forming a selectively permeable layer for gas discharge. The adhesion of the one-way breathable membrane 12 to the tank body 10 ensures close contact between the one-way breathable membrane 12 and the surface of the tank body 10, preventing air bubbles from leaking through the gap between the membrane and the tank body 10 and preventing centrifugal force from causing gypsum slurry to seep out of the edges of the air guide holes 10a.

[0066] Furthermore, the abutting end of the partition plate 111 is the side of the partition plate 111 closest to the outer circumference of the tank body 10 and abuts against the outer circumference 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 fit between the one-way breathable membrane 12 and the outer circumference of the tank body 10. At the same time, it prevents the gypsum slurry in the tank body 10 from being eroded and worn by the gypsum slurry due to centrifugal force and the thrust of the gypsum particles, thereby protecting the tank body 10.

[0067] Furthermore, bubbles, driven by the pushing force and negative pressure, move toward the air guide hole 10a, contacting the one-way breathable membrane 12 attached to the surface of the tank body 10. Because the membrane only allows the passage of gas, bubbles can penetrate the membrane and enter the area between the membrane and the partition 111. However, the gypsum slurry is blocked by the liquid repellency of the one-way breathable membrane 12 and cannot escape from the air guide hole 10a. However, bubbles that pass through the one-way breathable membrane 12 are pressed against the partition 111 of the air guide hole 10a, dividing the bubbles. They then flow along the divided partition 111, through the air flow channel 112, under the action of negative pressure, toward the negative pressure chamber 411, and are ultimately discharged.

[0068] In a specific embodiment, the air flow channel 112 has a first end 1121 and a second end 1122 connected to the first end 1121, the first end 1121 is arranged at an end of the air flow channel 112 close to the tank body 10, and the second end 1122 is arranged at an end of the air flow channel 112 away from the tank body 10; wherein, along the radial extension direction of the air flow 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 for the bubbles to enter the channel, and the second end 1122 is the outlet end for the bubbles to leave the channel, so that the flow path of the bubbles forms a directional track from the near tank body 10 to the far tank body 10.

[0070] An air flow channel 112 with equal angles is formed between each partition plate 111, and along the radial extension direction of the air flow 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 inlet with a small cross-sectional area can form an initial constraint on the bubbles. In the same closed cavity, under the same flow rate, the smaller the cross-sectional area, the higher the gas flow rate, so that the bubbles in the tank body 10 can be quickly discharged to the negative pressure cavity 411.

[0071] The bubbles move radially away from the tank body 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 point, the pressure within the airflow channel 112 decreases as the cross-sectional area increases, forming a pressure gradient from the inlet to the outlet. This gradient continuously pulls the bubbles toward the second end 1122.

[0072] In a specific embodiment, the guide assembly 11 has an annular hoop 113; multiple partition plates 111 are cocircular on the side away from the outer peripheral surface of the tank body 10 and form an annular guide boundary, the annular hoop 113 is coaxially arranged with the annular guide boundary, and the annular hoop 113 is sleeved on the outer periphery of the annular guide boundary to bundle and fix the multiple partition plates 111 to move along the tank body 10.

[0073] Specifically, the annular hoop 113 is an annular structural member that fixes and limits the plurality of partition plates 111 surrounding the circumference of the tank body 10 .

[0074] Furthermore, when the partition plate 111 rotates at high speed along with the tank body 10, the end away from the rotating shaft 30 will expand outward due to the centrifugal force and the squeezing force between the particles of the gypsum slurry. The expansion of the partition plate 111 is offset by the binding force of the annular hoop 113, thereby ensuring the structural stability of the guide assembly 11 and avoiding changes in the size of the air flow channel 112 due to 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 restraining force of the hoop on the partition plate 111 is evenly distributed along the circumference, and each partition plate 111 is subjected to the same radial restraining force, thereby avoiding the partition plate 111 from tilting or deforming due to uneven force, thereby enhancing the fit between the side of the partition plate 111 that abuts against the outer peripheral surface of the tank body 10 and the one-way breathable membrane 12.

[0076] In a specific embodiment, the eccentric device 20 also includes: a vacuum device 50, which is connected to the rotating shaft 30 along the axial extension direction of 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 vacuum pipe 51, one end of the vacuum 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 bubbles can 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. The interior of the evacuation tank 52 creates a vacuum environment lower than that of the negative pressure chamber 411. Through the pressure differential, active suction draws in and temporarily stores bubbles within the negative pressure chamber 411. The exhaust pipe 51 is a channel for extracting airflow from the negative pressure tank 41 to the evacuation tank 52. Its diameter is designed based on the volume of the negative pressure chamber 411 and the expected exhaust rate.

[0078] It should be noted that the number of the exhaust pipes 51 corresponds to the number of the 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 a specific embodiment, the negative pressure pumping 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] Among them, the driving device 60 includes: a driving member 61, an output shaft 62 and a driving belt 63. The axis of the output shaft 62 is parallel to the axis of the rotating shaft 30 and is drivingly connected to the driving member 61; one end of the driving belt 63 is sleeved on the output shaft 62, and the other end is sleeved on the mounting bracket 40.

[0081] Specifically, the driving member 61 provides the driving force and can be a motor, such as a servo motor or stepper motor. The output torque drives the output shaft 62 to rotate. The output shaft 62 transmits the rotational motion output by the driving member 61 to the drive belt 63, thereby rotating the rotating shaft 30 connected to the drive belt 63. 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, the negative pressure tank 41 supported thereon, and the tank body 10 to rotate together.

[0082] It should be noted that the driving belt 63 and the output shaft 62 and the contact surface 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 can also ensure that the rotation speed of each tank body 10 is consistent.

[0083] In a specific embodiment, the mounting frame 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 frame 40, and the second mounting position 43 is circumferentially arranged 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 formed on the mounting frame 40. In the embodiment of the present application, the first mounting position 42 is the center point of the mounting frame 40, and the aperture of the first mounting position 42 matches the evacuation tank 52. The first mounting position 42 and the evacuation tank 52 can be fixed to the mounting frame 40 by welding.

[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, the multiple negative pressure tanks 41 installed on the mounting frame 40 are all 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 between all negative pressure tanks 41 and the rotating shaft 30 is equal, so that under the rotation of the rotating shaft 30, the negative pressure tanks 41 installed on the mounting frame 40 are all subjected to the same rotation speed. The centrifugal force exerted on the gypsum slurry in the tank body 10 in 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 exhaust of some tank bodies 10 due to position deviation.

[0086] In a specific embodiment, the outer circumference of the output shaft 62 is provided with a first synchronous tooth 621 engaged with the drive belt 63, and the outer circumference of the mounting frame 40 is provided with a second synchronous tooth 31 engaged with the drive belt 63, and the tooth pitch of the first synchronous tooth 621 is equal to that of the second synchronous tooth 31.

[0087] Specifically, the output shaft 62 and the drive belt 63 are meshed with each other through a toothed structure, and the rotational motion of the output shaft 62 is transmitted to the drive belt 63 in a mechanical meshing manner. The drive belt 63 receives power through the meshing with the drive belt 63 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 is equal to that of the second synchronous tooth 31, ensuring that the tooth profiles of the first synchronous tooth 621, the drive belt 63, and the second synchronous tooth 31 match, forming a gapless meshing transmission pair, and ensuring that there is no interference or backlash between teeth during power transmission.

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

[0089] Specifically, the arc-shaped block serves as the connecting and positioning structure between the guide assembly 11 and the top of the negative pressure tank 41. Its curved surface mates with the annular groove, and by being embedded in it, it secures the top of the guide assembly 11 and limits radial and circumferential displacement of the guide assembly 11. This prevents movement due to centrifugal force during high-speed rotation, ensures the proper fit between the partition plate 111 and the outer circumference of the tank body 10, and ensures the tightness of the airflow channel 112, preventing bubbles from leaking through the gap.

[0090] By this means, the negative pressure extraction mechanism 100 of the gold mold provided above contains the foamed gypsum through the tank body 10 and opens the air guide hole 10a. The eccentric device 20 drives the tank body 10 to rotate eccentrically. Under the action of centrifugal force, the slurry moves toward the first accumulation area 13. The bubbles are forced to be pushed to the second accumulation area 14 due to the density difference and discharged into the negative pressure chamber 411 through the air guide hole 10a. By combining the active separation of centrifugal force and the coordinated extraction of bubbles in the gypsum slurry by negative pressure, the transition from "dispersed distribution" to "concentrated aggregation" is realized. The gathered bubbles are quickly connected to the negative pressure chamber 411 through the exclusive air guide hole 10a, and are accelerated to be discharged by using dual power, thereby realizing the problem of quickly extracting the bubbles in the gypsum slurry.

[0091] The above is only an implementation method of the present application. It should be pointed out that for ordinary technicians in this field, improvements can be made without departing from the creative concept of the present application, but these all fall within the scope of protection of the present application.

Claims

1. A negative pressure exhaust mechanism for a gold mold, characterized in that: include: The tank body is filled with foamed gypsum, and the outer peripheral surface of the tank body is provided with air guide holes; The eccentric device includes a rotating shaft and a mounting frame rotating about the rotating shaft, the mounting frame is provided with at least one negative pressure tank, the negative pressure tank has a negative pressure cavity defined therein, and the tank body is disposed in the negative pressure cavity; A first accumulation area and a second accumulation area are formed in the tank body, which are sequentially away from the rotating axis; When the tank body rotates around the rotating axis, the gypsum slurry in the foamed gypsum moves toward the first accumulation area under the action of centrifugal force, and the gypsum slurry pushes the bubbles to move toward the second accumulation area, so that the bubbles in the second accumulation area are discharged into the negative pressure chamber through the air guide hole.

2. The negative pressure exhaust mechanism for a gold mold according to claim 1, characterized in that: The negative pressure tank also has: a flow guide assembly, arranged with a gap between the circumferential inner wall of the negative pressure tank to form the negative pressure cavity; The guide assembly includes a plurality of partition plates arranged at equal angles and diverging along the circumference of the tank body. The side of the partition plate close to the tank body is attached to the outer peripheral surface of the tank body. Adjacent partition plates are spaced apart to form an airflow channel, and the airflow channel connects the air guide hole and the negative pressure chamber, so that the partition plates divide the bubbles and the bubbles flow into the negative pressure chamber along the airflow channel.

3. The negative pressure exhaust mechanism for a gold mold according to claim 2, characterized in that: The tank also includes: A one-way breathable membrane is attached to the outer peripheral surface of the tank body and contacts the abutting end of the partition plate. The one-way breathable membrane allows bubbles to be discharged into the air flow channel and blocks gypsum slurry from seeping into the air flow channel.

4. The negative pressure exhaust mechanism for a gold mold according to claim 2, characterized in that: The air flow channel has a first end and a second end connected to the first end, the first end is provided at an end of the air flow channel close to the tank body, and the second end is provided at an end of the air flow 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.

5. The negative pressure exhaust mechanism for a gold mold according to claim 2, characterized in that: The diversion assembly has an annular hoop; The multiple partition plates are cocircular on one side away from the outer peripheral surface of the tank body and form an annular guide boundary. The annular hoop is coaxially arranged with the annular guide boundary, and the annular hoop is sleeved on the outer periphery of the annular guide boundary to bundle and fix the multiple partition plates so that they move close to the tank body.

6. The negative pressure exhaust mechanism for a gold mold according to claim 1, characterized in that: The eccentric device also includes: an evacuation device connected to the rotating shaft along the axial extension direction of the rotating shaft and rotating coaxially with the rotating shaft; The vacuum device includes a vacuum tank and at least one vacuum pipe, one end of the vacuum pipe is connected to the vacuum tank, and the other end is connected to the negative pressure tank, so that the suction bubbles flow into the vacuum tank through the negative pressure cavity.

7. The negative pressure exhaust mechanism for a gold mold according to claim 1, characterized in that: The negative pressure exhaust mechanism also includes: a driving device, disposed adjacent to the eccentric device and configured to drive the rotating shaft to rotate; The driving device comprises: driving parts; an output shaft, the axis of the output shaft being parallel to the axis of the rotating shaft and being drivingly connected to the driving member; A driving belt has one end sleeved on the output shaft and the other end sleeved on the mounting bracket.

8. The negative pressure exhaust mechanism for a gold mold according to claim 6, characterized in that: The mounting frame 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 frame, 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 vacuum tank is embedded in the first mounting position.

9. The negative pressure exhaust mechanism for a gold mold according to claim 7, characterized in that: The outer circumference of the output shaft is provided with first synchronous teeth engaged with the drive belt, and the outer circumference of the mounting frame is provided with second synchronous teeth engaged with the drive belt. The tooth pitches of the first synchronous teeth and the second synchronous teeth are equal.

10. The negative pressure exhaust mechanism for a gold mold according to claim 2, characterized in that: The guide component is provided with an arc-shaped block on one side facing the top of the negative pressure tank, and the top inner wall of the negative pressure tank is provided with an annular groove adapted to the arc-shaped block, and the arc-shaped block is embedded in the annular groove.

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