Metal mold for manufacturing crucible

Abstract

The utility model relates to the technical field of high-temperature smelting molds, and discloses a metal mold for manufacturing a crucible, which comprises a mold body, a top plate is fixedly mounted at the top of the mold body, a graphite electrode is arranged at the bottom of the top plate, a connecting table is arranged at the top of the top plate, and a feeding hole is formed in the middle of the connecting table. A sealing cover is connected to the outer side of the connecting table, a containing groove is formed in the bottom of the sealing cover, and a sealing block is arranged at the top of the containing groove. The metal mold for manufacturing the crucible is made of nodular cast iron, the nodular cast iron is high in melting point and resistant to high temperature, has high tensile strength, yield strength, plasticity, impact toughness and other comprehensive mechanical properties, can keep certain strength at the high temperature of crucible smelting, does not deform and is not oxidized, and compared with a graphite mold, the manufacturing quality of the crucible is obviously improved; the adverse effect of impurities generated by graphite melting on the crucible is avoided; and the service life of the mold for the crucible is greatly prolonged.

Description

Technical Field

[0001] This utility model relates to the field of high-temperature melting mold technology, specifically a metal mold for making crucibles. Background Technology

[0002] A crucible is a cup-shaped vessel used in laboratories to heat solids at high temperatures. Quartz crucibles, made primarily of quartz sand, are characterized by their high purity, strong temperature resistance, large size and high precision, good heat retention, energy saving, and stable quality, leading to their increasingly widespread use.

[0003] Currently, graphite crucible molds are commonly used in the production of quartz crucibles. However, these molds are prone to slag shedding under high-temperature melting conditions, which affects the vacuuming speed and directly impacts the purity and product quality of the quartz crucible. Furthermore, graphite crucible molds are easily damaged at high temperatures, resulting in a short service life. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] In view of the shortcomings of the prior art, the present invention provides a metal mold for manufacturing crucibles to solve the problems mentioned in the background art.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, this utility model provides the following technical solution: a metal mold for making crucibles, comprising a mold body, a top plate fixedly installed on the top of the mold body, a graphite electrode provided at the bottom of the top plate, a connecting platform provided on the top of the top plate, a feed inlet in the middle of the connecting platform, a sealing cover connected to the outside of the connecting platform, a placement groove provided at the bottom of the sealing cover, a sealing block provided at the top of the placement groove, an inner cavity provided in the middle of the mold body, through holes provided on the inner surface and bottom of the inner cavity, a venting and sand-proof block fixedly installed inside the through holes, a venting chamber provided on the outer side of the inner cavity, an installation hole provided at the bottom of the venting chamber, an exhaust pipe fixedly installed inside the installation hole, a vacuum pump fixedly connected to the end of the exhaust pipe away from the installation hole, and an outlet pipe provided at the end of the vacuum pump away from the exhaust pipe.

[0008] Preferably, the through holes are evenly distributed circumferentially on the inner surface of the inner cavity.

[0009] Preferably, the ventilation cavity communicates with the inner chamber through a through hole.

[0010] Preferably, a heat insulation plate is provided at the bottom of the graphite electrode.

[0011] Preferably, the outer side of the connecting platform is provided with an external thread, the inner side of the placement groove is provided with an internal thread, and the connecting platform and the placement groove are threadedly connected.

[0012] Preferably, the inner top of the feed inlet is provided with an internal thread, the outer side of the sealing block is provided with an external thread, and the feed inlet and the sealing block are threadedly connected.

[0013] Compared with the prior art, the present invention provides a metal mold for manufacturing crucibles, which has the following beneficial effects:

[0014] The metal mold for making crucibles is made of ductile iron. Ductile iron has a high melting point, can withstand high temperatures, and has high comprehensive mechanical properties such as tensile strength, yield strength, plasticity, and impact toughness. It can maintain a certain strength at the high temperature of crucible melting without deformation or oxidation. Compared with graphite molds, the manufacturing quality of crucibles is significantly improved, avoiding the adverse effects of impurities produced by graphite melting on the crucible; and greatly improving the service life of crucible molds. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a cross-sectional view of the mold structure of this utility model;

[0017] Figure 3 This is a schematic cross-sectional view of the top plate structure of this utility model;

[0018] Figure 4 This is a three-dimensional structural diagram of the sealing cap of this utility model.

[0019] In the diagram: 1. Mold body; 2. Ventilation and sand-proof block; 3. Top plate; 4. Sealing cover; 5. Vacuum pump; 101. Inner chamber; 102. Through hole; 103. Ventilation chamber; 104. Mounting hole; 301. Graphite electrode; 302. Connecting platform; 303. Feed inlet; 401. Placement groove; 402. Sealing block; 501. Exhaust pipe; 502. Air outlet pipe. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] like Figure 1-4As shown, this utility model provides a technical solution: a metal mold for making crucibles, including a mold body 1, a top plate 3 fixedly installed on the top of the mold body 1, a graphite electrode 301 provided at the bottom of the top plate 3, a connecting platform 302 provided on the top of the top plate 3, a feed inlet 303 opened in the middle of the connecting platform 302, a sealing cover 4 connected to the outside of the connecting platform 302, a placement groove 401 opened at the bottom of the sealing cover 4, a sealing block 402 provided at the top of the placement groove 401, an inner cavity 101 opened in the middle of the mold body 1, through holes 102 opened on the inner surface and bottom of the inner cavity 101, a ventilation and sand-proof block 2 fixedly installed inside the through holes 102, a ventilation chamber 103 opened on the outside of the inner cavity 101, an installation hole 104 opened at the bottom of the ventilation chamber 103, an exhaust pipe 501 fixedly installed inside the installation hole 104, a vacuum pump 5 fixedly connected to the end of the exhaust pipe 501 away from the installation hole 104, and an outlet pipe 502 provided at the end of the vacuum pump 5 away from the exhaust pipe 501.

[0022] Furthermore, the through holes 102 are evenly distributed circumferentially on the inner surface of the inner cavity 101.

[0023] The above technical solutions ensure the stability and uniformity of the vacuum level in the inner chamber 101, resulting in a more uniform wall thickness and a smoother surface for the quartz crucible.

[0024] Furthermore, the ventilation chamber 103 is connected to the inner chamber 101 through the through hole 102.

[0025] The above technical solution ensures that when the vacuum pump 5 evacuates the ventilation chamber 103, the vacuum level in the sealed inner chamber 101 is increased, which facilitates the uniform adhesion of quartz sand to the inner wall of the inner chamber 101.

[0026] Furthermore, a heat insulation plate is provided at the bottom of the graphite electrode 301.

[0027] The above technical solution prevents graphite from falling onto the quartz during heating, thus avoiding affecting the purity of the quartz crucible and the quality of the product.

[0028] Furthermore, the outer side of the connecting platform 302 is provided with external threads, the inner side of the placement groove 401 is provided with internal threads, and the connecting platform 302 and the placement groove 401 are threadedly connected.

[0029] The above technical solution enhances the sealing performance of the sealing cap 4 through the connection of internal and external threads, preventing impurities from entering the inner cavity 101 and affecting the purity of the quartz crucible and product quality.

[0030] Furthermore, the top inner side of the feed inlet 303 is provided with an internal thread, the outer side of the sealing block 402 is provided with an external thread, and the feed inlet 303 and the sealing block 402 are threadedly connected.

[0031] The above technical solution further enhances the sealing performance of the sealing cap 4, preventing impurities from entering the inner chamber 101 and affecting the purity of the quartz crucible and product quality.

[0032] Working principle: First, the vacuum pump 5 is started to evacuate the inner chamber 101 through multiple through holes 102 at the bottom and sides of the inner chamber 101. At the same time, quartz sand is added into the inner chamber 101 through the feed port 303. Due to the centrifugal force, the quartz sand begins to form a quartz sand accumulation layer along the inner wall of the inner chamber 101. When a certain amount of quartz sand is added, the quartz sand accumulation layer is completely formed. Then, the sealing cover 4 is connected to the top of the top plate 3 through the connecting platform 302. At the same time, the vacuum pump 5 continues to evacuate the vacuum. When the pressure in the inner chamber 101 reaches the predetermined value, the evacuation is stopped. Then, the graphite electrode 301 is energized to generate an electric arc to melt the quartz sand in the inner chamber 101.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A metal mold for making a crucible, comprising a mold body (1), characterized by: The top of the mold body (1) is fixedly provided with a top plate (3), the bottom of the top plate (3) is provided with a graphite electrode (301), the top of the top plate (3) is provided with a connecting table (302), the middle of the connecting table (302) is provided with an inlet (303), the outer side of the connecting table (302) is connected with a sealing cover (4), the bottom of the sealing cover (4) is provided with a placing groove (401), the top of the placing groove (401) is provided with a sealing block (402), the middle of the mold body (1) is provided with an inner chamber (101), the inner side surface and the bottom of the inner chamber (101) are provided with a through hole (102), the inside of the through hole (102) is fixedly provided with a sandproof ventilation block (2), the outer side of the inner chamber (101) is provided with a ventilation cavity (103), the bottom of the ventilation cavity (103) is provided with a mounting hole (104), the inside of the mounting hole (104) is fixedly provided with an exhaust pipe (501), the end of the exhaust pipe (501) away from the mounting hole (104) is fixedly connected with a vacuum pump (5), the end of the vacuum pump (5) away from the exhaust pipe (501) is provided with an air outlet pipe (502).

2. A metal mold for producing a crucible according to claim 1, characterized in that: The through hole (102) is uniformly distributed on the inner side surface of the inner chamber (101).

3. A metal mold for making a crucible according to claim 1, characterized by: The ventilation cavity (103) is communicated with the through hole (102) and the inner chamber (101).

4. A metal mold for producing a crucible according to claim 1, characterized in that: The bottom of the graphite electrode (301) is provided with a heat insulation plate.

5. The metal mold for producing a crucible according to claim 1, wherein: The outer side of the connecting table (302) is provided with an external thread, the inner side of the placing groove (401) is provided with an internal thread, and the connecting table (302) and the placing groove (401) are screw connected.

6. A metal mold for making a crucible according to claim 1, characterized by: The inner side top of the inlet (303) is provided with an internal thread, the outer side of the sealing block (402) is provided with an external thread, and the inlet (303) and the sealing block (402) are screw connected.

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