A casting exhaust safety valve and its installation method

Abstract

The present invention belongs to the field of casting technology, specifically a casting exhaust safety valve and an installation method thereof, comprising an upper valve body, a lower valve body, a support assembly, a pressure reducing assembly, a storage chamber, a valve core, an adjusting bolt, and a support assembly. The support assembly is made of a fusible material, and the melting point of the support assembly is higher than the gas temperature in the casting chamber and slightly lower than the temperature of the high-temperature metal liquid. When metal liquid overflows from the exhaust valve and enters the casting exhaust safety valve, the molten high-temperature metal liquid can melt the support assembly, causing the valve core to lose its supporting function. Under the action of a spring, the valve core closes the opening, so that the casting exhaust safety valve is closed. The casting exhaust safety valve of the present invention is triggered directly from the high-temperature molten metal liquid, and its closing trigger is more reliable and stable, thereby improving the safety of the casting process and the quality of the casting.

Description

Technical Field

[0001] The invention relates to the technical field of casting, and in particular to a casting exhaust safety valve and an installation method thereof. Background Art

[0002] Casting is one of the earliest metal heat processing technologies mastered by humans, with a history of about 6,000 years. Casting is a method of pouring liquid metal into a mold cavity that is adapted to the shape of the part, and then cooling and solidifying it to obtain a part or blank. The cast material is mostly a metal that was originally solid but heated to a liquid state (for example: copper, iron, aluminum, tin, lead, etc.), and the material of the mold can be sand, metal or even ceramic.

[0003] During the casting process, when the molten metal fills the die-casting mold cavity, there are other gases such as ordinary air and gas generated by the volatilization of the release agent in the mold cavity. If these gases cannot be discharged from the cavity, it will affect the quality of the finished product. The prior art usually connects an exhaust valve for exhaust at the end of the mold overflow groove, such as the existing patents CN214888876U and US9657846B2. The exhaust valve in the above patents is actuated by gas or molten metal liquid. When air flows through the exhaust valve, the valve core is in an open state. When liquid metal enters the exhaust valve, the valve core is driven to close, thereby exhausting air and preventing metal liquid from overflowing.

[0004] However, in the actual casting process, since the speed at which liquid metal is poured into the mold cavity may be relatively fast, the flow state of liquid metal and air is disordered, and there is a mixed flow section of liquid metal and air in the flow channel. In the exhaust valve of the above-mentioned patent, the exhaust valve core is driven by liquid metal, and the valve core cannot clearly distinguish whether the fluid flowing through is a mixed section of air and liquid metal or liquid metal. If the closing force of the valve core is large, the valve core may not be closed when the mixed section of liquid metal flows through, which will cause the molten metal liquid to flow directly out of the exhaust valve, resulting in a safety accident; if the closing force of the valve core is small, the gas may not be discharged completely, resulting in poor quality of the finished casting. Therefore, the exhaust valves in the above two patents may have the risk of overflow of the mixed section of air and liquid metal, and the overflow of liquid metal under high pressure may cause serious accidents. Summary of the invention

[0005] The purpose of the present invention is to solve the risk of liquid metal overflow in the cast exhaust valve in the prior art, and to propose a cast exhaust safety valve and an installation method thereof.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The camming element is an airtight member which is adapted to engage the camming element and to engage with the valve core, and the camming element is an airtight member which is adapted to engage the camming element. Through hole, the support plate is arranged on the step hole; the pressure reducing assembly is T-shaped, which includes an integrally formed support shaft and a baffle plate, the baffle plate is abutted against the support rod, and the upper end of the support shaft is detachably fixedly connected with the lower end of the valve core by a thread; the first annular pad, the first partition plate, the second annular pad, the second partition plate, the third annular pad, the third partition plate, and the locking nut are sequentially sleeved on the support shaft, and the locking nut is threadedly matched with the support shaft; there is a flow gap between the baffle plate, the second partition plate and the opening, and a plurality of connecting holes are evenly arranged on the first partition plate and the third partition plate; the support assembly is made of fusible material, and when the support assembly is not melted, it can support the valve core away from the valve seat to keep the safety valve in an open state; when the poured metal liquid contacts the support assembly, it can melt the support assembly, causing the support assembly to lose its supporting function, and the valve core contacts the valve seat under the action of the spring to close the safety valve.

[0008] Preferably, a porous asbestos fiber member is provided at the air outlet.

[0009] Preferably, the upper valve body is fixedly provided with a shielding member on the outer side of the air outlet.

[0010] Preferably, the storage cavity is arranged around the support rod.

[0011] Preferably, the melting point of the meltable material is lower than the temperature of the metal liquid.

[0012] Preferably, the melting point of the meltable material is 2-100° C. lower than the temperature of the metal liquid.

[0013] Preferably, the upper portion of the storage chamber is adjacent to the lower end of the upper valve body, and the cross-section of the storage chamber is basin-shaped.

[0014] Preferably, the lower end of the lower valve body is threadedly connected to the air outlet of the exhaust valve of the casting machine.

[0015] A method for installing a cast exhaust safety valve comprises the following steps:

[0016] S1: sequentially sleeve the first annular gasket, the first baffle, the second annular gasket, the second baffle, the third annular gasket, the third baffle, and the locking nut of the decompression assembly on the support shaft, and lock each component with the locking nut;

[0017] S2: Install the thread on the upper end of the support shaft to the lower end of the valve core;

[0018] S3: Install the support plate of the support assembly in the step hole so that the support rod extends upward;

[0019] S4: Install the upper valve body and the lower valve body by threading;

[0020] S5: Install the assembly of the pressure reducing assembly and the valve core into the installation cavity of the upper valve body;

[0021] S6: Install the spring above the valve core, install the adjusting bolt on the upper end of the spring, and compress the spring.

[0022] Preferably, after step S6, the asbestos fiber porous member is installed at the air outlet, and then the shielding member is installed outside the air outlet of the upper valve body.

[0023] The invention provides a cast exhaust safety valve, which has the following beneficial effects:

[0024] 1. In the casting machine, due to the timeliness of air temperature transmission, there is a certain temperature difference between the high-temperature metal liquid and the gas in the casting cavity. The farther away from the molten metal liquid, the lower the temperature of the gas. The melting point of the support component is higher than the gas temperature in the casting cavity, and slightly lower than the temperature of the high-temperature metal liquid. The casting exhaust safety valve can be directly used as the exhaust valve of the casting machine to directly discharge the gas in the mold during the casting process; the casting exhaust safety valve can also be installed at the outlet of the exhaust valve of the casting machine. When metal liquid overflows from the exhaust valve, it enters the casting exhaust safety valve. The molten high-temperature metal liquid can melt the support component and make the valve core lose its supporting function. Under the action of the spring, the valve core closes the opening, so that the casting exhaust safety valve is closed; the casting exhaust safety valve of the present invention is triggered directly from the high-temperature molten metal liquid, and its closing trigger is more reliable and stable, which improves the safety of the casting process and the quality of the casting.

[0025] 2. A storage cavity is set around the support rod, which can temporarily store the molten metal liquid entering the exhaust safety valve, so that the support rod and the support plate can be fully heated and melted in time, so that the valve core can be closed more quickly and sensitively.

[0026] 3. A pressure reducing assembly is provided at the opening of the upper valve body, which can reduce the speed and pressure of gas discharge and prevent the molten metal liquid from gushing out and causing safety accidents.

[0027] 4. A porous asbestos fiber part is provided at the gas outlet, which does not affect the discharge of gas but can prevent the discharge of metal liquid; a shielding part is provided on the outside of the gas outlet, which can change the outflow direction of the high-temperature gas so that it will not affect the surrounding equipment and personnel.

[0028] 5. The casting exhaust safety valve greatly improves the safety of casting machine exhaust by setting up a fusible support component, a pressure reducing component, a storage chamber, an asbestos fiber porous component, and a shielding component. It can not only fully discharge the gas, but also reliably prevent the leakage of metal liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The drawings described herein are used to provide further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute improper limitations on the present application.

[0030] Figure 1 It is a structural schematic diagram of the casting exhaust safety valve of the present invention in an open state;

[0031] Figure 2 It is a structural schematic diagram of the closed state of the casting exhaust safety valve of the present invention;

[0032] Figure 3 , 4 It is a structural schematic diagram of a support assembly of a cast exhaust safety valve of the present invention;

[0033] Figure 5 , 6 It is a structural schematic diagram of a pressure reducing assembly of a cast exhaust safety valve of the present invention;

[0034] In the figure: upper valve body 1, lower valve body 2, support assembly 3, support rod 301, support plate 302, through hole 303, step hole 304, pressure reducing assembly 4, support shaft 401, baffle plate 402, first baffle plate 403, second baffle plate 404, third baffle plate 405, first annular pad 406, second annular pad 407, third annular pad 408, locking nut 409, air inlet 5, storage chamber 6, asbestos fiber porous part 7, air outlet 8, shielding part 9, valve core 10, spring 11, adjusting bolt 12, opening 13. DETAILED DESCRIPTION

[0035] The following will describe the implementation methods of the present application in detail with the help of accompanying drawings and examples, so that the implementation process of how the present application uses technical means to solve technical problems and achieve technical effects can be fully understood and implemented accordingly.

[0036] First embodiment: Refer to Figure 1-6A cast exhaust safety valve, characterized in that: it comprises an upper valve body 1 and a lower valve body 2, which are connected by threads; a mounting cavity is provided in the upper valve body 1, a valve core 10 and a spring 11 are provided in the mounting cavity, one end of the spring 11 abuts on the valve core 10, and the other end of the spring 11 abuts on the adjusting bolt 12, and the adjusting bolt 12 is threadedly connected to the upper valve body 1; an air outlet channel is horizontally provided in the upper valve body 1, one end of the air outlet channel is an air outlet 8, and the other end is connected to the mounting cavity; an air inlet channel is vertically provided in the lower valve body 2, and the air inlet One end of the air channel is an air inlet 5, and the other end is provided with a stepped hole 304; a storage chamber 6 is also provided on the upper part of the lower valve body 2; the lower end of the valve core 10 is threadedly connected to the pressure reducing assembly 4, and the lower end of the pressure reducing assembly 4 abuts against the support assembly 3, and the pressure reducing assembly 4 is located at the opening 13 at the lower end of the upper valve body 1, and a valve seat is provided at the upper end of the opening 13, and the valve core 10 can contact and close with the valve seat; the support assembly 3 is T-shaped, and includes an integrally formed support rod 301 and a support plate 302, and a plurality of through holes 303 are evenly provided on the support plate 302 in the circumferential direction, and the support plate 30 2 is arranged on the step hole 304; the decompression assembly 4 is T-shaped, and includes an integrally formed support shaft 401 and a baffle plate 402, the baffle plate 402 is in contact with the support rod 301, and the upper end of the support shaft 401 is detachably fixedly connected to the lower end of the valve core 10 through a thread; the support shaft 401 is sequentially sleeved with a first annular pad 406, a first baffle plate 403, a second annular pad 407, a second baffle plate 404, a third annular pad 408, a third baffle plate 405, and a locking nut 409, and the locking nut 409 is screwed to the support shaft 401 The pattern is matched; there is a flow gap between the baffle plate 402, the second baffle plate 404 and the opening 13, and a plurality of connecting holes are evenly arranged on the first baffle plate 403 and the third baffle plate 405; the support component 3 is made of a fusible material, and when the support component 3 is not melted, it can support the valve core 10 away from the valve seat, so that the safety valve is in an open state; when the poured metal liquid contacts the support component 3, it can melt the support component 3, so that the support component 3 loses its supporting function, and the valve core 10 contacts the valve seat under the action of the spring 11, closing the safety valve. In the casting machine, due to the timeliness of air temperature transmission, there is a certain temperature difference between the high-temperature metal liquid and the gas in the casting cavity. The farther away from the molten metal liquid, the lower the temperature of the gas. The melting point of the support component is higher than the gas temperature in the casting cavity, and slightly lower than the temperature of the high-temperature metal liquid. The casting exhaust safety valve can be directly used as the exhaust valve of the casting machine to directly discharge the gas in the mold during the casting process; the casting exhaust safety valve can also be installed at the outlet of the exhaust valve of the casting machine. When metal liquid overflows from the exhaust valve and enters the casting exhaust safety valve, the molten high-temperature metal liquid can melt the supporting component, causing the valve core to lose its supporting function. Under the action of the spring, the valve core closes the opening, so that the casting exhaust safety valve is closed; the casting exhaust safety valve of the present invention is triggered directly from the high-temperature molten metal liquid, and its closing trigger is more reliable and stable, thereby improving the safety of the casting process and the quality of the casting.

[0037] The gas outlet 8 is provided with an asbestos fiber porous member 7 , which does not affect the discharge of gas but can prevent the discharge of metal liquid.

[0038] The upper valve body 1 is fixedly provided with a shielding member 9 on the outer side of the gas outlet 8, and the shielding member can change the outflow direction of the high-temperature gas so that it will not affect the surrounding equipment and personnel.

[0039] The storage chamber 6 is arranged around the support rod 301, and the storage chamber can temporarily store the molten metal liquid entering the exhaust safety valve, so that the support rod and the support plate can be fully heated and melted in time, so that the valve core can be closed more quickly and sensitively.

[0040] The melting point of the meltable material is lower than the temperature of the molten metal. The purpose of setting the melting point of the meltable material lower than the temperature of the molten metal is to enable the support component to melt in time when the molten metal flows into the exhaust safety valve. At the same time, it should be noted that the support component should be ensured not to melt before it contacts the molten metal, which requires the melting point of the support component to be higher than the gas temperature in the casting cavity.

[0041] The melting point of the fusible material is 2-100°C lower than the temperature of the metal liquid. The support component is replaceable and is made of a fusible material. Specifically, an alloy of iron, aluminum, copper, tin or other metals can be used. By adjusting the ratio of different components (for example, in the alloy of aluminum and tin, the ratio of the first group of aluminum and tin is 1:1, and the ratio of the second group of aluminum and tin is 2:1, then the melting point of the first group of alloys should be lower than that of the second group of alloys), alloys with different melting points can be obtained, that is, a support component with a specific melting point can be obtained as needed. The above content is only a simple description. The specific operation is not limited to the alloy of two metals, and non-metallic elements such as carbon can also be included. This is what the prior art can do, and this article will not repeat it. The overall melting point range of the support component is set at 500-2000°C, and a group of support components is set every 50°C, that is, the melting points of the support components that can be selected include 500°C, 550°C, 600°C...1950°C, 2000°C, and then in the casting process, the support component with the corresponding melting point is selected according to the temperature of the material to be cast. For example, when the casting material is steel, since the melting point of steel is about 1500°C, the melting point of the support component can be selected to be 1400°C or 1450°C.

[0042] The upper portion of the storage chamber 6 is adjacent to the lower end of the upper valve body 1 , and the cross-section of the storage chamber 6 is basin-shaped. Such a structure facilitates the cleaning of metal materials remaining in the storage chamber after the upper valve body and the lower valve body are disassembled.

[0043] The lower end of the lower valve body 2 is threadedly connected to the air outlet of the exhaust valve of the casting machine.

[0044] Second embodiment: A method for installing a cast exhaust safety valve, comprising the following steps:

[0045] S1: The first annular gasket 406, the first baffle 403, the second annular gasket 407, the second baffle 404, the third annular gasket 408, the third baffle 405, and the locking nut 409 of the decompression assembly 4 are sequentially sleeved on the support shaft 401, and the locking nut 409 is used to lock each component;

[0046] S2: Thread the upper end of the support shaft 401 onto the lower end of the valve core 10;

[0047] S3: Install the support plate 302 of the support assembly 3 in the step hole 304 so that the support rod 301 extends upward; S4: Install the upper valve body 1 and the lower valve body 2 by threading;

[0048] S5: Install the assembly of the pressure reducing assembly 4 and the valve core 10 into the installation cavity of the upper valve body 1;

[0049] S6: Install the spring 11 above the valve core 10, install the adjusting bolt 12 on the upper end of the spring 11, and compress the spring 11.

[0050] After step S6 , the asbestos fiber porous member 7 is installed at the air outlet 8 , and then the shielding member 9 is installed outside the air outlet 8 of the upper valve body 1 .

[0051] For example, certain words are used in the specification and claims to refer to specific components. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. As mentioned throughout the specification and claims, "including" is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problem within a certain error range and basically achieve the technical effect. The subsequent description of the specification is a preferred embodiment of implementing the present application, but the description is for the purpose of illustrating the general principles of the present application, and is not used to limit the scope of the present application. The scope of protection of the present application shall be determined by the definition of the attached claims.

[0052] It should be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a product or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such product or system. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the product or system including the elements.

[0053] The above description shows and describes several preferred embodiments of the present invention, but as mentioned above, it should be understood that the present invention is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the invention concept described herein through the above teachings or the technology or knowledge of the relevant field. Changes and variations made by those skilled in the art do not depart from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A cast exhaust safety valve, characterized in that: It comprises an upper valve body (1) and a lower valve body (2), wherein the upper valve body (1) and the lower valve body (2) are connected via threads; The upper valve body (1) is provided with an installation cavity, in which a valve core (10) and a spring (11) are provided, one end of the spring (11) abuts against the valve core (10), and the other end of the spring (11) abuts against an adjusting bolt (12), and the adjusting bolt (12) is threadedly connected to the upper valve body (1); an air outlet channel is horizontally provided in the upper valve body (1), one end of the air outlet channel is an air outlet (8), and the other end is communicated with the installation cavity; An air intake passage is vertically arranged in the lower valve body (2), one end of the air intake passage is an air intake port (5), and the other end is provided with a stepped hole (304); a storage chamber (6) is also arranged on the upper part of the lower valve body (2); The lower end of the valve core (10) is threadedly connected to the pressure reducing assembly (4), the lower end of the pressure reducing assembly (4) abuts against the support assembly (3), the pressure reducing assembly (4) is located at the lower end opening (13) of the upper valve body (1), a valve seat is provided at the upper end of the opening (13), and the valve core (10) can contact and close with the valve seat; The support assembly (3) is T-shaped, and comprises an integrally formed support rod (301) and a support plate (302); a plurality of through holes (303) are evenly arranged circumferentially on the support plate (302); and the support plate (302) is arranged on the step hole (304); The pressure reducing assembly (4) is T-shaped, and comprises an integrally formed support shaft (401) and a baffle plate (402); the baffle plate (402) is in contact with the support rod (301); the upper end of the support shaft (401) is detachably fixedly connected to the lower end of the valve core (10) by means of a thread; a first annular pad (406), a first baffle plate (403), a second annular pad (407), a second baffle plate (404), a third annular pad (408), a third baffle plate (405), and a locking nut (409) are sequentially sleeved on the support shaft (401); the locking nut (409) is threadedly matched with the support shaft (401); a flow gap exists between the baffle plate (402), the second baffle plate (404) and the opening (13); a plurality of connecting holes are evenly arranged on the first baffle plate (403) and the third baffle plate (405); The support component (3) is made of a fusible material. When the support component (3) is not melted, it can support the valve core (10) away from the valve seat, so that the safety valve is in an open state; when the poured metal liquid contacts the support component (3), it can melt the support component (3), so that the support component (3) loses its supporting function, and the valve core (10) contacts the valve seat under the action of the spring (11), closing the safety valve.

2. The cast exhaust safety valve according to claim 1, characterized in that: The air outlet (8) is provided with an asbestos fiber porous member 7.

3. The cast exhaust safety valve according to claim 1, characterized in that: The upper valve body (1) is fixedly provided with a shielding member (9) on the outer side of the air outlet (8).

4. The cast exhaust safety valve according to claim 1, characterized in that: The storage cavity (6) is arranged around the support rod (301).

5. The cast exhaust safety valve according to claim 1, characterized in that: The melting point of the meltable material is lower than the temperature of the metal liquid.

6. The cast exhaust safety valve according to claim 5, characterized in that: The melting point of the meltable material is 2-100° C. lower than the temperature of the metal liquid.

7. The cast exhaust safety valve according to claim 1, characterized in that: The upper portion of the storage chamber (6) is adjacent to the lower end of the upper valve body (1), and the cross-section of the storage chamber (6) is basin-shaped.

8. The cast exhaust safety valve according to claim 1, characterized in that: The lower end of the lower valve body (2) is threadedly connected to the air outlet of the exhaust valve of the casting machine.

9. A method for installing a cast exhaust safety valve according to any one of claims 1 to 8, comprising the following steps: S1: The first annular gasket (406), the first baffle (403), the second annular gasket (407), the second baffle (404), the third annular gasket (408), the third baffle (405), and the locking nut (409) of the decompression assembly (4) are sequentially sleeved on the support shaft (401), and the locking nut (409) is used to lock each component; S2: Thread the upper end of the support shaft (401) onto the lower end of the valve core (10); S3: Install the support plate (302) of the support assembly (3) in the stepped hole (304) so ​​that the support rod (301) extends upward; S4: Install the upper valve body (1) and the lower valve body (2) by threading; S5: Installing the assembly of the pressure reducing assembly (4) and the valve core (10) into the installation cavity of the upper valve body (1); S6: Install the spring (11) above the valve core (10), install the adjusting bolt (12) on the upper end of the spring (11), and compress the spring (11).

10. The method for installing a cast exhaust safety valve according to claim 9, characterized in that: After step S6, the asbestos fiber porous member (7) is installed at the air outlet (8), and then the shielding member (9) is installed outside the air outlet (8) of the upper valve body (1).

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