Casting mold exhaust device for alloy smelting

Abstract

The casting mold exhaust device for alloy smelting comprises an upper exhaust block, a lower exhaust block and an exhaust pin assembly, an inlet, an overflow groove, first to fourth flow blocking channels, an air outlet channel and an exhaust port are sequentially arranged between the upper exhaust block and the lower exhaust block in a communicating mode, and the second flow blocking channel and the fourth flow blocking channel are each provided with a porous ceramic plate; the exhaust pin assembly is arranged at the exhaust port. The overflow groove serves as a buffer area of molten metal and can collect cold materials, gas and redundant molten metal. The multi-stage flow blocking channel can block molten metal from flowing upwards and promote bubbles to float upwards and gather through the gravity and fluid dynamics principle, meanwhile, gas is guided to be separated naturally and flow directionally, gas retention is avoided, and the exhaust efficiency is improved. And the porous ceramic plate can optimize the exhaust efficiency and the metal liquid blocking capacity. By means of the casting mold exhaust device, the defects of casting air holes, shrinkage porosity and the like can be remarkably reduced, and the casting density and mechanical property are improved. The exhaust pin assembly facilitates the control of the installation depth of the exhaust pin and improves the use flexibility.

Description

Technical Field

[0001] The invention relates to the technical field of alloy smelting and casting, and in particular to a casting mold exhaust device for alloy smelting. Background Art

[0002] Casting is a method of pouring liquid metal into a casting 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 liquid, such as copper, iron, aluminum, tin, lead, etc., and the mold material can be sand, metal or even ceramics.

[0003] During the casting process, if the gas (such as air, water vapor, reaction gas, etc.) in the mold cannot be discharged in time, it will cause defects such as pores and shrinkage holes inside the casting, affecting the mechanical properties and surface quality of the casting. The current exhaust method usually uses simple exhaust holes or exhaust grooves, but these methods have problems such as low exhaust efficiency, easy gas backflow, and molten metal infiltration into the exhaust channel, which need to be improved.

[0004] In addition, in current molds, the gas in the mold cavity is generally discharged through an exhaust pin. However, the existing exhaust pin structure is relatively simple, and it is not easy to control and adjust the depth of the exhaust pin inserted into the gas exhaust port. Therefore, it cannot be applied to different types of die-casting molds and has poor flexibility in use. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a casting mold exhaust device for alloy smelting, which can improve the exhaust efficiency and prevent gas reflux and metal liquid infiltration; at the same time, it is easy to control and adjust the installation depth of the exhaust pin and enhance the flexibility of use.

[0006] To achieve the above object, the present invention adopts the following technical solutions: The present invention provides a casting mold exhaust device for alloy smelting, which comprises an upper exhaust block, a lower exhaust block and an exhaust pin assembly. The upper exhaust block is arranged opposite to the lower exhaust block, and the upper exhaust block and the lower exhaust block are sequentially connected to each other and are provided with an inlet, an overflow groove, a first flow blocking channel, a second flow blocking channel, a third flow blocking channel, a fourth flow blocking channel, an air outlet channel and a discharge port. The first flow blocking channel extends obliquely upward from the overflow groove and gradually narrows, the second flow blocking channel is provided with a first porous ceramic plate, the third flow blocking channel extends obliquely upward from the second flow blocking channel and gradually narrows, and the fourth flow blocking channel is provided with a second porous ceramic plate; the exhaust pin assembly is arranged at the discharge port.

[0007] Preferably, the air outlet channel is divided into two branches from the fourth flow blocking channel, and each branch is bent, the end of each branch corresponds to an exhaust port, and a group of the exhaust pin assemblies is arranged at each exhaust port.

[0008] Preferably, the porosity of the first porous ceramic plate and the second porous ceramic plate are respectively 30% to 50%, the pore size of the first porous ceramic plate is not greater than 0.1 mm, and the pore size of the second porous ceramic plate is not greater than 0.08 mm.

[0009] Preferably, the exhaust pin assembly includes a fixed seat and an exhaust pin, a limiting plate is provided on one side of the fixed seat, and the limiting plate is installed on the outer end of the exhaust port; a through hole is provided in the fixed seat, and the through hole passes through the fixed seat and the limiting plate, and the exhaust pin is passed through the through hole and inserted into the exhaust port; a limiting groove is provided on the hole wall of the through hole, and a plurality of positioning grooves are correspondingly provided on the outer wall of the exhaust pin, and the plurality of positioning grooves are arranged at intervals along the length direction of the exhaust pin; a limiting frame is provided inside the fixed seat, and a limiting part is provided on the limiting frame, and the limiting part passes through the limiting groove and is inserted into the corresponding positioning groove, so that the fixed seat and the exhaust pin are limited and fixed.

[0010] Preferably, the limiting grooves are respectively provided on both sides of the hole wall of the through hole, and two rows of positioning grooves are correspondingly provided on both sides of the outer wall of the exhaust pin.

[0011] A U-shaped installation cavity is provided in the fixing seat, and the through hole corresponds to the inner side of the installation cavity; the installation cavity includes a first cavity and two second cavities located on both sides of the first cavity, and the two second cavities are respectively connected to the limiting grooves on both sides.

[0012] The limiting frame is U-shaped, and includes a first frame body and two second frames located on both sides of the first frame body, the length direction of the first frame body is perpendicular to the central axis direction of the through hole, and the length direction of the second frame body is perpendicular to the length direction of the first frame body and the central axis direction of the through hole; the first frame body is arranged in the first cavity, and the two second frames are respectively arranged in the two second cavities; the limiting part is arranged at one end of the second frame body away from the first frame body, and the structure of the limiting part matches the structure of the limiting groove and the positioning groove respectively.

[0013] Preferably, the width of the first cavity is greater than the width of the first frame, and the length of the second cavity is greater than the length of the second frame; a first spring is provided on the side of the first frame close to the through hole, one end of the first spring is connected to the first frame, and the other end is connected to the inner wall of the first cavity; a button is provided on the side of the first frame away from the through hole, and the button passes through the fixing seat.

[0014] Preferably, the limiting portion is formed by a corresponding portion of the second frame body protruding toward the inner side of the limiting frame, and a limiting surface is provided on a side of the limiting portion close to the first frame body, and the structure of the limiting surface matches the structure of the positioning groove.

[0015] Preferably, the exhaust pin has a first end and a second end opposite to each other, an exhaust port and an exhaust channel are provided inside the exhaust pin, the exhaust port is located inside the first end of the exhaust pin, and the exhaust channel is communicated with the exhaust port; a pin core is inserted at the exhaust port, and a plurality of air guide grooves are provided on the pin core; one end of the pin core is exposed at the first end of the exhaust pin, and the other end of the pin core is inserted into the exhaust channel and is provided with a fixing plate, and a second spring is provided between the fixing plate and the inner wall of the exhaust pin.

[0016] Preferably, a sealing flange is provided at one end of the pin core away from the fixing plate, and a sealing surface is provided at one end of the exhaust port away from the exhaust channel, and the structure of the sealing flange matches the structure of the sealing surface.

[0017] Preferably, the second end of the exhaust pin is inserted into the exhaust port, and a sealing ring is provided on the outer wall of the second end of the exhaust pin.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: in the casting mold exhaust device of the present invention, the overflow trough serves as a buffer zone for the molten metal, which can collect cold materials, gas and excess molten metal; the multi-stage flow blocking channel utilizes the principles of gravity and fluid dynamics to block the upward flow of the molten metal, promote the floating and aggregation of bubbles, and guide the natural separation and directional flow of the gas to avoid gas retention and improve the exhaust efficiency; the porous ceramic plate allows gas to pass through, but prevents the molten metal from passing through, thereby optimizing the exhaust efficiency and the molten metal barrier capacity. The use of the casting mold exhaust device can significantly reduce defects such as porosity and shrinkage in the casting, and improve the density and mechanical properties of the casting. In addition, the casting mold exhaust device has a compact structure and strong applicability. It is compatible with alloys of different viscosities and casting pressure conditions, and can broaden the application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of the structure of the exhaust device of the casting mold according to some embodiments of the present invention.

[0020] Figure 2 Schematic diagram of the structure of the lower exhaust block in some embodiments of the present invention.

[0021] Figure 3 Schematic diagram of the structure of the exhaust pin assembly in some embodiments of the present invention.

[0022] Figure 4 Schematic diagram of the structure of the fixing seat in some embodiments of the present invention.

[0023] Figure 5 It is a cross-sectional view of a fixing seat and a limiting frame in some embodiments of the present invention.

[0024] Figure 6 2 is a cross-sectional view of a fixing seat in some embodiments of the present invention.

[0025] Figure 7 2 is a cross-sectional view of a limiting frame in some embodiments of the present invention.

[0026] Figure 8 Schematic diagram of the structure of the exhaust pin and the pin core in some embodiments of the present invention.

[0027] Fig. 9 Schematic diagram of the structure of the exhaust pin and the pin core in other embodiments of the present invention.

[0028] Fig.10 Schematic diagram of the disassembled structure of the exhaust pin assembly according to some other embodiments of the present invention.

[0029] In the figure, 1-fixed seat, 101-limiting plate, 1011-fixing hole, 102-through hole, 103-limiting groove, 104-installation cavity, 1041-first cavity, 1042-second cavity, 105-upper cover, 106-lower cover, 107-first guide structure; 2-exhaust pin, 201-positioning groove, 202-second guide structure, 203-exhaust port, 204-exhaust channel, 204-sealing surface, 206-sealing ring; 3-limiting frame, 301-first frame, 302-second frame, 303-limiting part, 3 031-limiting surface, 304-first spring, 305-button; 4-pin core, 401-air guide groove, 402-fixing plate, 403-second spring, 404-sealing flange; 5-upper exhaust block; 6-lower exhaust block, 601-inlet, 602-overflow groove, 603-first flow blocking channel, 604-second flow blocking channel, 605-third flow blocking channel, 606-fourth flow blocking channel, 607-air outlet channel, 608-discharge port, 609-first porous ceramic plate, 610-second porous ceramic plate; 7-exhaust pin assembly. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the embodiment of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, not all of the embodiments. Based on the described embodiment of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention. It can be understood that some technical means of the various embodiments described herein can be replaced or combined with each other without conflict.

[0031] In the description of the present invention, if there are terms such as "first", "second", etc., they are only used to distinguish the objects described, and do not have any order or technical meaning. Therefore, the objects defined as "first", "second", etc. may explicitly or implicitly include one or more of the objects. In addition, "one" or "a" and similar words do not indicate a quantity limitation, but indicate the existence of at least one, and "multiple" means not less than two.

[0032] In the description of the present specification, reference to "one embodiment" or "some embodiments" etc. means that one or more embodiments of the present invention include a specific feature, structure or characteristic described in conjunction with the embodiment. Therefore, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in this specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0033] The invention provides a casting mold exhaust device for alloy smelting, which is used to improve exhaust efficiency and prevent gas backflow and metal liquid infiltration; at the same time, it is easy to control and adjust the installation depth of the exhaust pin and enhance the flexibility of use.

[0034] Reference Figure 1 and Figure 2 As shown, in some embodiments, the exhaust device of the casting mold for alloy smelting includes an upper exhaust block 5, a lower exhaust block 6 and an exhaust pin assembly 7. The upper exhaust block 5 and the lower exhaust block 6 are arranged opposite to each other, and the upper exhaust block 5 and the lower exhaust block 6 are connected in sequence with an inlet 601, an overflow groove 602, a first flow blocking channel 603, a second flow blocking channel 604, a third flow blocking channel 605, a fourth flow blocking channel 606, an outlet channel 607 and a discharge port 608. The first flow blocking channel 603 extends obliquely upward from the overflow groove 602 and gradually narrows. The second flow blocking channel 604 is provided with a first porous ceramic plate 609. The third flow blocking channel 605 extends obliquely upward from the second flow blocking channel 604 and gradually narrows. The fourth flow blocking channel 606 is provided with a second porous ceramic plate 610; the exhaust pin assembly 7 is provided at the discharge port 608.

[0035] In the above-mentioned casting mold exhaust device, the overflow groove 302 serves as a buffer zone for the molten metal, which can collect cold materials, gases and excess molten metal. At the first baffle channel 603, through the channel design that extends obliquely upward and gradually narrows, it is possible to use the principles of gravity and fluid dynamics to slow down the flow rate of the molten metal, promote the floating and aggregation of bubbles, and guide the gas to separate naturally and flow in a directional manner to avoid gas retention. At the second baffle channel 604, the first porous ceramic plate 609 is combined to allow gas to pass through, but prevent the molten metal from passing through, thereby optimizing the exhaust efficiency and the molten metal barrier capacity. At the third baffle channel 605, through the channel design that extends obliquely upward and gradually narrows, it is possible to use the principles of gravity and fluid dynamics to promote the floating and aggregation of bubbles, and guide the gas to separate naturally and flow in a directional manner to avoid gas retention. At the fourth baffle channel 606, the second porous ceramic plate 610 is combined to form a second filter, forming a graded barrier, which can allow gas to pass through, but prevent the molten metal from passing through, further optimizing the exhaust efficiency and the molten metal barrier capacity. The above-mentioned mold exhaust device can significantly reduce defects such as pores and shrinkage in castings, and improve the density and mechanical properties of castings. In addition, the mold exhaust device has a compact structure and strong applicability, and can be compatible with different viscosity alloys and casting pressure conditions, thus broadening the application scenarios.

[0036] In some embodiments, the ratio of the depth of the overflow groove 302, the extension length of the first flow blocking channel 603, the extension length of the second flow blocking channel 604, the extension length of the third flow blocking channel 605, and the extension length of the fourth flow blocking channel 606 is 1: (5-12): (5-8): (3-6), so that better exhaust efficiency and effective isolation of molten metal can be achieved. Of course, the present invention is not limited to this. In other embodiments, the dimensions of each part can also be reasonably set according to actual conditions.

[0037] Reference Figure 2 In some embodiments, the gas outlet channel 607 is divided into two branches from the fourth flow blocking channel 606, and each branch is bent, and the end of each branch corresponds to a discharge port 608, and a set of exhaust pin assemblies 7 is provided at each discharge port 608. The design of the bent double-branch gas outlet channel can extend the gas flow path and form a turbulent effect to further discharge the gas, and the diversion design can avoid single point failure, improve the system fault tolerance, and ensure the continuity of exhaust during the casting process, which is particularly suitable for large or complex castings.

[0038] In some embodiments, the porosity of the first porous ceramic plate and the second porous ceramic plate is 30% to 50% respectively. Under the premise of ensuring sufficient air permeability, the structural strength of the ceramic plate is maintained to avoid the risk of cracking under high-pressure casting conditions. The pore size of the first porous ceramic plate 609 is not greater than 0.1 mm, and the pore size of the second porous ceramic plate 610 is not greater than 0.08 mm. The first porous ceramic plate 609 and the second porous ceramic plate 610 form a graded barrier, which can ensure the effective discharge of tiny bubbles and strictly prevent the leakage of molten metal.

[0039] Combined with reference Figure 1 and Figure 3 In some embodiments, the exhaust pin assembly 7 includes a fixing seat 1 and an exhaust pin 2, and a limiting plate 101 is provided on one side of the fixing seat 1, and the limiting plate 101 is installed at the outer end of the exhaust port 608. The limiting plate 101 and the fixing seat 1 can be integrally connected or welded. Furthermore, a plurality of fixing holes 1011 are provided on the limiting plate 101, and the fixing holes 1011 are used to fix the limiting plate 101 at the exhaust port 608. The number of the fixing holes 1011 can be reasonably set according to actual needs.

[0040] Reference Figure 1 , Figures 2 to 8 The fixing seat 1 is provided with a through hole 102, which passes through the fixing seat 1 and the limiting plate 101, and the exhaust pin 2 is penetrated in the through hole 102 and inserted into the exhaust port 608. A limiting groove 103 is provided on the hole wall of the through hole 102. A plurality of positioning grooves 201 are correspondingly provided on the outer wall of the exhaust pin 2, and the plurality of positioning grooves 201 are arranged at intervals along the length direction of the exhaust pin 2. A limiting frame 3 is provided inside the fixing seat 1, and a limiting portion 303 is provided on the limiting frame 3. The limiting portion 303 passes through the limiting groove 103 and is inserted into the corresponding positioning groove 201, so that the fixing seat 1 and the exhaust pin 2 are fixed in a limited manner.

[0041] During application, the limiting plate 101 is used to install the exhaust pin assembly 7 at the exhaust port 608, and the exhaust pin 2 is correspondingly inserted into the exhaust port 608. The fixed seat 1, the limiting frame 3 and the structure of the exhaust pin 2 cooperate with each other, and the exhaust pin 2 is fixed in the fixed seat 1 at different positions by engaging the limiting portion 303 on the limiting frame 3 with the corresponding positioning groove 201 on the exhaust pin 2, so that the exhaust pin 2 is inserted into the exhaust port 608 with a suitable installation depth, which is convenient for adjusting the installation depth of the exhaust pin 2 according to the length of different exhaust ports 608; the exhaust pin assembly 7 is easy to install and simple to operate, can be applied to molds of different structures and meet the casting process requirements of different products, thereby improving the flexibility of use.

[0042] Reference Figure 3 , Figure 5 and Figure 6In some preferred embodiments, limiting grooves 103 are respectively provided on both sides of the hole wall of the through hole 102, and two rows of positioning grooves 201 are correspondingly provided on both sides of the outer wall of the exhaust pin 2, and multiple positioning grooves 201 in each row are evenly arranged along the length direction of the exhaust pin 2.

[0043] Furthermore, a U-shaped installation cavity 104 is provided in the fixing seat 1, and the through hole 102 corresponds to the inner side of the installation cavity 104; the installation cavity 104 includes a first cavity 1041 and two second cavities 1042 located on both sides of the first cavity 1041, the length direction of the first cavity 1041 is perpendicular to the central axis direction of the through hole 102, the length direction of the second cavity 1042 is perpendicular to the length direction of the first cavity 1041 and the central axis direction of the through hole 102, and the two second cavities 1042 are respectively connected to the limiting grooves 103 on both sides.

[0044] Reference Figures 5 to 7 The limiting frame 3 is U-shaped, and includes a first frame 301 and two second frames 302 located on both sides of the first frame 301. The length direction of the first frame 301 is perpendicular to the central axis direction of the through hole 102, and the length direction of the second frame 302 is perpendicular to the length direction of the first frame 301 and the central axis direction of the through hole 102. The first frame 301 is arranged in the first cavity 1041, and the two second frames 302 are respectively arranged in the two second cavities 1042. The limiting portion 303 is arranged at one end of the second frame 302 away from the first frame 301, and the structure of the limiting portion 303 matches the structures of the limiting groove 103 and the positioning groove 201 respectively.

[0045] Further, in the length direction of the second cavity 1042, the width of the first cavity 1041 is greater than the width of the first frame 301, and the length of the second cavity 1042 is greater than the length of the second frame 302. A first spring 304 is provided on the side of the first frame 301 close to the through hole 102, one end of the first spring 304 is connected to the first frame 301, and the other end is connected to the inner wall of the first cavity 1041. The first spring 304 is located in the middle of the first frame 301, and the central axis of the first spring 304 is parallel to the length direction of the second frame 302. A button 305 is provided on the side of the first frame 301 away from the through hole 102, and the button 305 passes through the fixing seat 1.

[0046] Reference Figure 7 The limiting portion 303 is formed by the corresponding part of the second frame 302 protruding toward the inner side of the limiting frame 3 (the inner side here refers to the inner side of the U-shaped structure of the limiting frame 303), and a limiting surface 3031 is provided on the side of the limiting portion 303 close to the first frame 301, and the structure of the limiting surface 3031 matches the structure of the positioning groove 201.

[0047] When the exhaust pin assembly 7 is in use, the exhaust pin assembly 7 is installed at the exhaust port 608 by using the limiting plate 101. Figure 5 The left side direction shown in the figure), the limit frame 3 faces Figure 5 The first spring 304 is compressed, and the two limiting parts 303 respectively disengage from the corresponding limiting grooves 103 and enter the corresponding second cavity 1042 at the end away from the first cavity 1041. At this time, the limiting part 303 has no limiting and fixing effect on the exhaust pin 2, and the exhaust pin 2 can be moved axially, so as to adjust and control the axial position of the exhaust pin 2 in the fixing seat 1; after adjusting to the appropriate position to ensure that the limiting groove 103 is aligned with the corresponding positioning groove 201, the button 305 can be released, and the second spring 304 is reset, thereby driving the limiting frame 3 toward Figure 5 As shown in the right direction, the limiting portion 303 re-enters the corresponding limiting groove 103 and engages in the corresponding positioning groove 201 to limit and fix the exhaust pin 2.

[0048] Reference Figure 4 In some embodiments, the fixing base 1 has an upper cover 105 and a lower cover 106, the upper cover 105 is detachably connected to the lower cover 106, the above-mentioned installation cavity 104 and the limiting groove 103 are formed between the upper cover 105 and the lower cover 106, and the limiting plate 101 is connected to the lower cover 106. Furthermore, the upper cover 105 and the lower cover 106 can be detachably connected by partially hinged and bolted fixing, by snap-fitting, etc. After the upper cover 105 and the lower cover 106 are disassembled, it is convenient to install or remove the limiting frame 3.

[0049] Reference Fig.10 In some other embodiments, the hole wall of the through hole 102 is provided with a first guide structure 107, and the extension direction of the first guide structure 107 is parallel to the central axis direction of the through hole 102. The side wall of the exhaust pin 2 is provided with a second guide structure 202 that matches the first guide structure 107, and the extension direction of the second guide structure 202 is parallel to the central axis direction of the exhaust pin 2. Furthermore, the first guide structure 107 and the second guide structure 202 can be designed as mutually matching bump and groove structures. When adjusting the axial position of the exhaust pin 2 in the fixed seat 1, the cooperation between the first guide structure 107 and the second guide structure 202 is utilized to enable the exhaust pin 2 to move along its axial direction, ensuring that the limiting groove 103 is axially aligned with the positioning groove 201, thereby improving the positioning accuracy and adjustment efficiency.

[0050] Reference Figure 8In some embodiments, the exhaust pin 2 has a first end and a second end opposite to each other, and an exhaust port 203 and an exhaust channel 204 are provided inside the exhaust pin 2. The exhaust port 203 is located inside the first end of the exhaust pin 2, and the exhaust channel 204 is connected to the exhaust port 203. A pin core 4 is inserted at the exhaust port 203, and a plurality of air guide grooves 401 are provided on the pin core 4; one end of the pin core 4 is exposed at the first end of the exhaust pin 2, and the other end of the pin core 4 is inserted into the exhaust channel 204 and provided with a fixing plate 402, and a second spring 403 is provided between the fixing plate 402 and the inner wall of the exhaust pin 2.

[0051] In application, the second end of the exhaust pin 2 is inserted into the exhaust port 608, and the gas passes through the inlet 601, the overflow groove 602, the first flow blocking channel 603, the second flow blocking channel 604, the third flow blocking channel 605, the fourth flow blocking channel 606, the gas outlet channel 607 and the exhaust port 608 in sequence and then enters the exhaust channel 204. The pressure of the gas is applied to the fixed plate 402. When the pressure of the gas is greater than the elastic force of the second spring 403, the second spring 403 will be compressed and the pin core 4 will be pushed outward; when the pin core 4 is pushed outward to a certain position, the exhaust channel 204, the air guide groove 401, the exhaust port 203 and the outside world are connected, and the gas can be discharged. When the gas is exhausted, the fixed plate 402 is no longer subjected to the pressure of the gas, and the second spring 403 returns to its original length, thereby driving the pin core 4 to reset. In this way, the automatic exhaust and pin core reset functions can be realized, which is convenient to use. In addition, in other embodiments, the first end of the exhaust pin 2 can also be connected to a vacuum pumping device. During the exhaust process of the mold, the vacuum pumping device draws air outward, so that the second spring 403 is compressed and the pin core 4 moves outward, thereby exhausting the gas.

[0052] Furthermore, a sealing ring 206 is provided on the outer wall of the second end of the exhaust pin 2 . The sealing ring 206 can be made of rubber or other materials to ensure the sealing performance of the exhaust pin 2 when it is installed in the exhaust port 608 .

[0053] Reference Fig. 9 In other embodiments, a sealing flange 404 is provided at one end of the pin core 4 away from the fixing plate 402, and a sealing surface 205 is provided at one end of the exhaust port 103 away from the exhaust passage 204, and the structure of the sealing flange 404 matches the structure of the sealing surface 205. Further, the sealing flange 404 is in a frustum shape, and the sealing surface 205 is a matching conical structure. When the pin core 4 is installed in the exhaust port 203, the side wall of the sealing flange 404 fits with the sealing surface 205, thereby ensuring the sealing performance.

[0054] In the casting mold exhaust device of the present invention, the overflow trough serves as a buffer zone for the molten metal, which can collect cold materials, gas and excess molten metal; the multi-stage flow blocking channel utilizes the principles of gravity and fluid dynamics to block the upward flow of the molten metal, promote the floating and aggregation of bubbles, and guide the gas to separate naturally and flow in a directional manner, thereby avoiding gas retention and improving exhaust efficiency; the porous ceramic plate allows gas to pass through, but prevents the molten metal from passing through, thereby optimizing the exhaust efficiency and the molten metal barrier capacity. The use of the casting mold exhaust device can significantly reduce defects such as pores and shrinkage in the casting, and improve the density and mechanical properties of the casting. At the same time, the casting mold exhaust device has a compact structure and strong applicability. It is compatible with alloys of different viscosities and casting pressure conditions, and can broaden the application scenarios. In addition, in the exhaust pin assembly, the structures of the fixed seat, the limit frame and the exhaust pin are matched with each other, and the exhaust pin is fixed in the fixed seat at different positions by engaging the limit part on the limit frame with the corresponding positioning groove on the exhaust pin, so that the exhaust pin can be inserted into the exhaust port at a suitable installation depth, which is convenient for controlling and adjusting the installation depth of the exhaust pin, can be adapted to different casting process requirements, and improves flexibility of use.

[0055] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, changes and modifications made without departing from the spirit and scope of the present invention are all within the scope of patent protection of the present invention.

Claims

1. A mold exhaust device for alloy smelting, characterized in that: The casting mold exhaust device for alloy smelting includes an upper exhaust block, a lower exhaust block and an exhaust pin assembly, the upper exhaust block is arranged opposite to the lower exhaust block, and the upper exhaust block and the lower exhaust block are connected in sequence with an inlet, an overflow groove, a first flow blocking channel, a second flow blocking channel, a third flow blocking channel, a fourth flow blocking channel, an air outlet channel and a discharge port, the first flow blocking channel extends obliquely upward from the overflow groove and gradually narrows, the second flow blocking channel is provided with a first porous ceramic plate, the third flow blocking channel extends obliquely upward from the second flow blocking channel and gradually narrows, and the fourth flow blocking channel is provided with a second porous ceramic plate; the exhaust pin assembly is arranged at the discharge port.

2. The exhaust device for alloy smelting casting mold according to claim 1, characterized in that: The air outlet channel is divided into two branches from the fourth flow blocking channel, and each branch is bent. The end of each branch corresponds to an exhaust port, and a group of exhaust pin assemblies is arranged at each exhaust port.

3. The exhaust device for alloy smelting casting mold according to claim 1, characterized in that: The porosity of the first porous ceramic plate and the second porous ceramic plate are respectively 30% to 50%, the pore size of the first porous ceramic plate is not greater than 0.1 mm, and the pore size of the second porous ceramic plate is not greater than 0.08 mm.

4. The exhaust device for alloy smelting casting mold according to claim 1, characterized in that: The exhaust pin assembly includes a fixed seat and an exhaust pin, a limiting plate is provided on one side of the fixed seat, and the limiting plate is installed on the outer end of the exhaust port; a through hole is provided in the fixed seat, and the through hole passes through the fixed seat and the limiting plate, and the exhaust pin is passed through the through hole and inserted into the exhaust port; a limiting groove is provided on the hole wall of the through hole, and a plurality of positioning grooves are correspondingly provided on the outer wall of the exhaust pin, and the plurality of positioning grooves are arranged at intervals along the length direction of the exhaust pin; a limiting frame is provided inside the fixed seat, and a limiting part is provided on the limiting frame, and the limiting part passes through the limiting groove and is inserted into the corresponding positioning groove, so that the fixed seat and the exhaust pin are limited and fixed.

5. The exhaust device for alloy smelting casting mold according to claim 4, characterized in that: The limiting grooves are respectively arranged on both sides of the hole wall of the through hole, and two rows of positioning grooves are correspondingly arranged on both sides of the outer wall of the exhaust pin; The fixing seat is provided with a U-shaped installation cavity, and the through hole corresponds to the inner side of the installation cavity; the installation cavity includes a first cavity and two second cavities located on both sides of the first cavity, and the two second cavities are respectively connected to the limiting grooves on both sides; The limiting frame is U-shaped, and includes a first frame body and two second frames located on both sides of the first frame body, the length direction of the first frame body is perpendicular to the central axis direction of the through hole, and the length direction of the second frame body is perpendicular to the length direction of the first frame body and the central axis direction of the through hole; the first frame body is arranged in the first cavity, and the two second frames are respectively arranged in the two second cavities; the limiting part is arranged at one end of the second frame body away from the first frame body, and the structure of the limiting part matches the structure of the limiting groove and the positioning groove respectively.

6. The exhaust device for alloy smelting casting mold according to claim 5, characterized in that: The width of the first cavity is greater than the width of the first frame, and the length of the second cavity is greater than the length of the second frame; a first spring is provided on the side of the first frame close to the through hole, one end of the first spring is connected to the first frame, and the other end is connected to the inner wall of the first cavity; a button is provided on the side of the first frame away from the through hole, and the button passes through the fixing seat.

7. The exhaust device for alloy smelting casting mold according to claim 6, characterized in that: The limiting portion is formed by the corresponding portion of the second frame protruding toward the inner side of the limiting frame, and a limiting surface is provided on a side of the limiting portion close to the first frame, and the structure of the limiting surface matches the structure of the positioning groove.

8. The exhaust device for alloy smelting casting mold according to any one of claims 4 to 6, characterized in that: The exhaust pin has a first end and a second end opposite to each other, an exhaust port and an exhaust channel are provided inside the exhaust pin, the exhaust port is located inside the first end of the exhaust pin, and the exhaust channel is communicated with the exhaust port; a pin core is inserted at the exhaust port, and a plurality of air guide grooves are provided on the pin core; one end of the pin core is exposed at the first end of the exhaust pin, and the other end of the pin core is inserted into the exhaust channel and is provided with a fixing plate, and a second spring is provided between the fixing plate and the inner wall of the exhaust pin.

9. The exhaust device for alloy smelting casting mold according to claim 8, characterized in that: A sealing flange is provided at one end of the pin core away from the fixing plate, and a sealing surface is provided at one end of the exhaust port away from the exhaust channel. The structure of the sealing flange matches the structure of the sealing surface.

10. The exhaust device for alloy smelting casting mold according to claim 8, characterized in that: The second end of the exhaust pin is inserted into the exhaust port, and a sealing ring is provided on the outer wall of the second end of the exhaust pin.

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