Furnace cover of holding furnace of low-pressure casting machine

Abstract

The utility model belongs to the technical field of low-pressure casting machine corollary equipment, and particularly relates to a low-pressure casting machine heat preservation furnace cover which comprises a cover body, a sealing groove and a heat dissipation groove are formed in the lower side of the cover body, and a sealing ring is installed in an inner cavity of the sealing groove. The heat dissipation groove is located in the side, close to the circle center, in the sealing groove and is arranged to be in a spiral shape. At least two circles of heat dissipation grooves are arranged; an air inlet pipe is installed on the outer side of the cover body and communicates with the outermost ring of an inner cavity of the heat dissipation groove, and an air inlet hole communicating with an inner cavity of the heat preservation furnace is formed in the lower side of the innermost ring of the heat dissipation groove. The heat dissipation groove is formed near the sealing ring of the cover body, airflow is guided into the heat preservation furnace through the heat dissipation groove according to the principle that the low-pressure casting machine heat preservation furnace needs to be aerated and pressurized, heat near the sealing ring is taken away through normal-temperature airflow, and therefore the temperature of the sealing ring is prevented from being too high.

Description

Technical Field

[0001] This utility model relates to the technical field of supporting equipment for low-pressure casting machines, specifically a furnace cover for a low-pressure casting machine's heat preservation furnace. Background Technology

[0002] Low-pressure casting machines are general-purpose equipment for low-pressure casting of aluminum alloys, widely used in the production of aluminum alloy castings in the automotive, motorcycle, instrument, textile machinery, and aerospace industries. The holding furnace of a low-pressure casting machine is mainly used for melting metallic aluminum. Subsequently, inert gas is introduced into the holding furnace for pressurization, which forces the molten aluminum into the mold through pipes.

[0003] The holding furnace and furnace cover of the low-pressure casting machine are equipped with a sealing ring, which serves to seal and keep the furnace warm. However, when the holding furnace is working, the crucible inside needs to be heated to melt the aluminum metal. At this time, the holding furnace and furnace cover will quickly rise to a high temperature. After the furnace cover is opened, it moves away from the holding furnace, and the temperature of the furnace cover will drop rapidly back to room temperature. The rapid alternation between room temperature and high temperature will accelerate the aging of the sealing ring on the furnace cover, resulting in poor sealing between the holding furnace and the furnace cover, and the service life of the sealing ring will also be reduced. Utility Model Content

[0004] The purpose of this utility model is to provide a furnace cover for a low-pressure casting machine's heat preservation furnace, in order to solve the problem mentioned in the background art of the high working environment temperature of the sealing ring on the existing heat preservation furnace cover.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a furnace cover for a low-pressure casting machine heat preservation furnace, comprising a cover body, wherein a sealing groove and a heat dissipation groove are provided on the lower side of the cover body, and a sealing ring is installed in the inner cavity of the sealing groove; the heat dissipation groove is located on the side of the sealing groove near the center, and the heat dissipation groove is arranged in a vortex shape; the heat dissipation groove is provided in at least two circles.

[0006] An air inlet pipe is installed on the outside of the cover, and the air inlet pipe is connected to the outermost ring of the heat dissipation groove cavity. An air inlet hole connected to the inner cavity of the heat dissipation groove cavity is provided on the lower side of the innermost ring of the heat dissipation groove cavity.

[0007] A liquid inlet pipe is provided through the upper side of the cover, and an adapter is also provided on the upper side of the cover. There are two adapters, which are arranged symmetrically.

[0008] Preferably, the cover includes an outer cover, with a connecting plate and a heat insulation plate disposed on the inner side of the outer cover, and the connecting plate being located on the upper side of the heat insulation plate; a reinforcing plate is sleeved on the outer side of the liquid inlet pipe, and the reinforcing plate is welded to the connecting plate.

[0009] Preferably, the heat insulation board includes an upper heat insulation layer, a filling layer and a lower heat insulation layer, with the filling layer located between the upper heat insulation layer and the lower heat insulation layer.

[0010] Preferably, the lower end face of the lower insulation layer is located below the sealing ring, and an inner retaining ring aligned with the lower insulation layer is provided on the inner side of the outer cover, with the inner retaining ring aligned with the inner wall of the heat preservation furnace.

[0011] Preferably, the lower side of the outer cover is provided with an annular groove that communicates with the heat dissipation groove, and an annular baffle is installed in the inner cavity of the annular groove, with the air inlet opening on the annular baffle.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1) This device has a heat dissipation groove near the sealing ring of the cover. Utilizing the principle that the holding furnace of the low-pressure casting machine needs to be pressurized by adding gas, the airflow is introduced into the holding furnace through the heat dissipation groove. The heat near the sealing ring is carried away by the room temperature airflow, thereby avoiding the sealing ring from getting too hot. Reducing the maximum temperature of the sealing ring environment can slow down the aging rate of the sealing ring and thus extend the service life of the sealing ring.

[0014] 2) The device has a vortex-shaped heat dissipation groove on the cover, so that when the airflow flows, it will circle the heat dissipation groove at least once, carrying away the heat around the sealing ring and avoiding excessive local temperature of the sealing ring.

[0015] 3) The airflow entering the holding furnace is heated in the heat dissipation tank, so that its temperature is raised before it comes into contact with the molten aluminum, thus avoiding the low temperature airflow entering the temperature surrounding the molten aluminum and thus avoiding uneven temperature of the molten aluminum. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of this utility model;

[0017] Figure 2 This is a schematic cross-sectional view of the cover of this utility model;

[0018] Figure 3 This is a schematic diagram of the outer cover structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the annular baffle structure of this utility model;

[0020] Figure 5 This is a schematic diagram showing the shape of the heat dissipation groove and the position of the air inlet of this utility model.

[0021] In the diagram: 10 Outer cover, 20 Adapter frame, 30 Air inlet pipe, 40 Connecting plate, 50 Liquid inlet pipe, 61 Lower insulation layer, 62 Filling layer, 63 Upper insulation layer, 71 Heat dissipation groove, 72 Annular baffle, 721 Air inlet hole, 80 Sealing ring. Detailed Implementation

[0022] 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.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Example:

[0025] Please see Figure 1-5 This utility model provides a technical solution: a furnace cover for a low-pressure casting machine's holding furnace, comprising a cover body, a sealing ring 80, a liquid inlet pipe 50, and a transfer frame 20. The sealing ring 80 is installed on the lower side of the cover body. When the cover body moves down and the sealing ring 80 is tightly fitted with the holding furnace, the cover body and the holding furnace form a closed space. The lower end of the liquid inlet pipe 50 penetrates the cover body and is inserted into the molten aluminum in the holding furnace. The upper end of the liquid inlet pipe 50 communicates with the inner cavity of the mold. After sufficient inert gas is injected into the holding furnace, the molten aluminum in the holding furnace crucible enters the inner cavity of the mold along the liquid inlet pipe 50 under the action of gas pressure. A transfer frame 20 is provided on the upper side of the cover body, which is connected to the opening and closing mechanism of the low-pressure casting machine to facilitate the opening or closing of the cover body by the opening and closing mechanism. There are two transfer frames 20, which are symmetrically arranged.

[0026] The lower side of the cover will contact the insulation furnace, and both the sealing groove and the heat dissipation groove 71 are located on the lower side of the cover. A sealing ring 80 is installed inside the sealing groove, with its lower side slightly protruding from the sealing groove. The heat dissipation groove 71 is located inside the sealing groove. Compared to the sealing groove, the heat dissipation groove 71 is closer to the center of the cover, so even if there is air leakage in the heat dissipation groove 71, the inert gas leaking out of the heat dissipation groove 71 will still be inside the sealing ring 80 (i.e., the inert gas remains inside the insulation furnace), preventing waste of inert gas. The heat dissipation groove 71 is designed in a vortex shape, which facilitates gas flow and helps the gas carry away heat.

[0027] An air inlet pipe 30 is installed on the outer side of the cover, and an air inlet hole 721 communicating with the inner cavity of the heat dissipation groove 71 is provided on the lower side of the heat dissipation groove 71. The air inlet hole 721 has an inclination angle, so that the airflow enters the heat dissipation groove 71 and forms a vortex. The pipe of the low-pressure casting machine pressurization system is connected to the air inlet pipe 30, and the air inlet pipe 30 is connected to the inner cavity of the heat dissipation groove 71. The pressurization system can send inert gas from the air inlet pipe 30 into the heat dissipation groove 71, and then the inert gas is discharged from the air inlet hole 721 after passing through the heat dissipation groove 71. The heat dissipation groove 71 is vortex-shaped with at least two rings. The air inlet pipe 30 is connected to the outermost ring of the inner cavity of the heat dissipation groove 71, and the air inlet hole 721 is located on the lower side of the innermost ring of the heat dissipation groove 71. After the airflow enters the heat dissipation groove 71, it will first go around in the heat dissipation groove 71, and then be discharged into the heat dissipation groove 71 from the air inlet hole 721. The airflow goes around in one ring first, which makes it easier to remove the heat near the sealing ring 80.

[0028] The cover includes an outer cover 10, with a connecting plate 40 and a heat insulation plate on the inner side of the outer cover 10. Heat in the furnace is transferred from the molten aluminum in the crucible to the surrounding area, and the heat insulation plate slows down the rate at which heat is transferred to the sealing ring 80. The connecting plate 40 is located above the heat insulation plate, and a reinforcing plate is fitted around the outside of the liquid inlet pipe 50. The reinforcing plate is welded to the connecting plate 40, and the connecting plate 40 is fixedly connected to the outer cover 10. The two can be bolted together. Since the connecting plate 40 and the outer cover 10 do not need to be opened or closed, a metal sealing ring can be used between them to delay aging.

[0029] The heat insulation board includes an upper heat insulation layer 63, a filling layer 62, and a lower heat insulation layer 61, with the filling layer 62 located between the upper heat insulation layer 63 and the lower heat insulation layer 61. The upper heat insulation layer 63 and the lower heat insulation layer 61 can be made of aluminum silicate fiberboard, and the filling layer 62 is made of aluminum silicate fiber cotton. The upper heat insulation layer 63 and the lower heat insulation layer 61 can be perforated and then fixed together with bolts. A protruding ring is provided on the inner side of the outer cover 10, and the upper heat insulation layer 63 and the lower heat insulation layer 61 are clamped on both sides of the protruding ring, achieving a seal through the clamping of the heat insulation layer and the protruding ring.

[0030] The lower end face of the lower insulation layer 61 is located below the sealing ring 80, and an inner baffle ring aligned with the lower insulation layer 61 is provided on the inner side of the outer cover 10. After the cover and the heat preservation furnace are closed, the inner baffle ring extends into the inner cavity of the heat preservation furnace, and a small gap is left between the outer side of the inner baffle ring and the inner wall of the heat preservation furnace. An annular groove communicating with the heat dissipation groove 71 is provided on the lower side of the outer cover 10. An annular baffle 72 is installed in the inner cavity of the annular groove, and an air inlet 721 is opened on the annular baffle 72. The annular baffle 72 is connected to the outer cover 10 by bolts. The two do not need to be completely sealed, as long as they fit together. A small portion of the airflow in the heat dissipation groove 71 will flow out from the gap between the annular baffle 72 and the outer cover 10, and then some of the gas will flow into the heat preservation furnace along the gap between the inner baffle ring and the heat preservation furnace. The gas flow carries away heat, thereby reducing the heat transferred into the heat preservation furnace.

[0031] Working principle: When heating is carried out in the holding furnace, gas is slowly added to the holding furnace through the pressurization system. The gas flow enters the heat dissipation tank 71 through the air inlet pipe 30, and then enters the holding furnace through the air inlet 721. Since the heat dissipation tank 71 is close to the sealing ring 80 and the temperature of the added inert gas is low, the gas flow will carry away heat, thereby reducing the temperature near the sealing ring 80 and slowing down the heating rate of the sealing ring 80. When the aluminum in the holding furnace is completely melted, the gas supply speed is increased, the gas pressure in the holding furnace increases, and the aluminum liquid is pushed into the mold along the liquid inlet pipe 50. The increased air flow speed accelerates the cooling rate, and the temperature of the sealing ring 80 begins to decrease to avoid the sealing ring 80 from overheating.

[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model, and no reference numerals in the claims should be considered as limiting the scope of the claims.

[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 low pressure casting machine holding furnace cover comprising a cover body, characterised in that: The lower side of the cover is provided with a sealing groove and a heat dissipation groove (71). A sealing ring (80) is installed in the inner cavity of the sealing groove. The heat dissipation groove (71) is located on the side of the sealing groove near the center, and the heat dissipation groove (71) is set in a vortex shape. The heat dissipation groove (71) is provided with at least two rings. An air inlet pipe (30) is installed on the outside of the cover. The air inlet pipe (30) is connected to the outermost ring of the inner cavity of the heat dissipation groove (71). An air inlet hole (721) connected to the inner cavity of the heat dissipation groove (71) is provided on the lower side of the innermost ring of the heat dissipation groove (71). An inlet pipe (50) is provided through the upper side of the cover, and an adapter (20) is also provided on the upper side of the cover. There are two adapters (20), which are arranged symmetrically.

2. An insulated ladle cover for a low pressure casting machine according to claim 1, characterized in that: The cover includes an outer cover (10), and a connecting plate (40) and a heat insulation plate are provided on the inner side of the outer cover (10), with the connecting plate (40) located on the upper side of the heat insulation plate; a reinforcing plate is sleeved on the outer side of the liquid inlet pipe (50), and the reinforcing plate is welded to the connecting plate (40).

3. An insulated low pressure casting machine furnace cover according to claim 2, characterized in that: The heat insulation board includes an upper heat insulation layer (63), a filling layer (62) and a lower heat insulation layer (61), with the filling layer (62) located between the upper heat insulation layer (63) and the lower heat insulation layer (61).

4. An insulated ladle cover for a low pressure casting machine according to claim 3, wherein: The lower end face of the lower insulation layer (61) is located below the sealing ring (80), and the inner side of the outer cover (10) is provided with an inner retaining ring aligned with the lower insulation layer (61), and the inner retaining ring is aligned with the inner wall of the heat preservation furnace.

5. An insulated low pressure casting machine furnace cover according to claim 2, characterized in that: The lower side of the outer cover (10) is provided with an annular groove that communicates with the heat dissipation groove (71). An annular baffle (72) is installed in the inner cavity of the annular groove, and an air inlet (721) is opened on the annular baffle (72).

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