Vacuum exhaust device of evanescent mode casting

Abstract

The utility model relates to the technical field of processing equipment, in particular to a vacuum exhaust device of an evanescent mode casting, which comprises a fixed base for placing a plurality of groups of evanescent mode casting sand boxes, and a liftable vacuum exhaust hood and a vacuum exhauster which are arranged above the fixed base. According to the utility model, the liftable vacuum exhaust hood mounted above the fixed base is matched with the two groups of lifting hydraulic cylinders which work synchronously and the top seat for fixing the lifting hydraulic cylinders, so that the vacuum exhaust hood can be lifted flexibly; meanwhile, a pouring pipe is mounted on one side of the liftable vacuum exhaust hood, and a replaceable transverse pipe and a branch pipe which are connected with the pouring pipe ensure that liquid casting raw materials can be accurately conveyed into each evanescent mode casting sand box; in addition, the exhaust pipe is arranged and matched with the vacuum exhauster and the stretchable metal corrugated pipe, the vacuum exhaust function is effectively achieved, gas in the casting production process is exhausted in time, and the casting quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of processing equipment technology, specifically to a vacuum exhaust device for lost foam castings. Background Technology

[0002] Lost foam casting, as an advanced casting process, offers advantages such as material savings, simplified procedures, improved production efficiency, and enhanced casting quality. However, in actual production, lost foam castings often exhibit defects such as porosity, severely impacting their performance and service life. To overcome this challenge, vacuum venting technology is widely used in lost foam casting to effectively remove gases and residues from the casting, thereby improving casting quality. Traditionally, lost foam casting venting devices are often simply designed with limited venting channels, resulting in poor gas removal and low venting efficiency, failing to meet the production demands for high-quality castings. Furthermore, traditional venting devices require frequent adjustments and manual intervention during operation, increasing operational complexity and production costs. Utility Model Content

[0003] The purpose of this invention is to provide a vacuum exhaust device for lost foam castings, so as to solve the problems mentioned in the background art, such as the inconvenience of operation and poor exhaust effect of existing lost foam casting exhaust devices.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] The vacuum exhaust device for lost foam castings includes a fixed base for placing several sets of lost foam casting sand boxes, a liftable vacuum exhaust hood installed on the fixed base, and a vacuum exhaust machine. It also includes two sets of synchronously operating lifting hydraulic cylinders for adjusting the liftable vacuum exhaust hood and a top seat for fixing the lifting hydraulic cylinders.

[0006] A pouring pipe for conveying liquid casting raw materials is installed on one side of the liftable vacuum exhaust hood. A replaceable horizontal pipe is connected to the end of the pouring pipe. A branch pipe with the same number and corresponding position as the lost foam casting sand box is installed on the bottom of the outer wall of the replaceable horizontal pipe. An exhaust pipe is installed on the top of the side of the liftable vacuum exhaust hood away from the pouring pipe.

[0007] The fixed base has side frames vertically installed at the middle of both ends, and the top base is connected to the top of the two sets of side frames at both ends respectively.

[0008] The air inlet of the vacuum exhaust machine is connected to the exhaust pipe via a stretchable metal bellows.

[0009] Preferably, the top of the outer wall of the replaceable horizontal tube is fitted with a connecting sleeve that is compatible with the size of the end of the casting pipe and is plugged in.

[0010] Preferably, the height of the side frame is more than twice the height of the liftable vacuum exhaust hood.

[0011] Preferably, the width of the liftable vacuum exhaust hood is the same as the distance between the two sets of side frames, and the side wall of the liftable vacuum exhaust hood slides in conjunction with the outer wall of the side frame.

[0012] Preferably, the bottom area of ​​the fixed base is larger than the bottom area of ​​the liftable vacuum exhaust hood.

[0013] Preferably, the piston rod of the lifting hydraulic cylinder is coaxially connected to a connecting plate at its bottom.

[0014] Preferably, the connecting plate is connected to the top surface of the liftable vacuum exhaust hood by at least two sets of fixing bolts.

[0015] Compared with existing technologies, the beneficial effects of this utility model are:

[0016] In this lost foam casting vacuum exhaust device, a fixed base is used to stably place several sets of lost foam casting sand boxes. A liftable vacuum exhaust hood, installed above the fixed base, works in conjunction with two sets of synchronously operating lifting hydraulic cylinders and a fixed top seat to achieve flexible raising and lowering of the vacuum exhaust hood. Simultaneously, a pouring pipe installed on one side of the liftable vacuum exhaust hood, along with its connected replaceable horizontal pipe and branch pipe, ensures that liquid casting raw materials are accurately delivered to each lost foam casting sand box. Furthermore, the exhaust pipe, in conjunction with the vacuum exhaust machine and a stretchable metal corrugated pipe, effectively achieves the vacuum exhaust function, promptly removing gases generated during the casting process, improving casting quality. The entire device has a compact structure, is easy to operate, and greatly enhances the production efficiency and product quality of lost foam castings.

[0017] In the vacuum exhaust device of this lost foam casting, a connecting sleeve that is compatible with the end size of the pouring pipe and fits into the top of the replaceable horizontal tube is installed on the outer wall. This makes the connection between the pouring pipe and the replaceable horizontal tube more stable and easier to disassemble and replace, thus improving the flexibility and practicality of the device.

[0018] In the vacuum exhaust device of this lost foam casting, the connecting plate is connected to the top surface of the liftable vacuum exhaust hood by at least two sets of fixing bolts, which facilitates installation and disassembly, and also provides convenience for the maintenance and upkeep of the device. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are explained in detail together with the embodiments of the present invention, but do not constitute a limitation thereof.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the structure of the liftable vacuum exhaust hood of this utility model after it has been raised.

[0022] Figure 3 This is a schematic diagram of the cross-sectional structure of the liftable vacuum exhaust hood of this utility model;

[0023] Figure 4 This is an exploded structural diagram of the replaceable horizontal pipe and casting pipe of this utility model.

[0024] 10. Adjustable vacuum exhaust hood; 11. Casting pipe; 12. Replaceable horizontal pipe; 13. Exhaust pipe; 14. Corrugated metal pipe; 15. Branch pipe; 16. Connecting sleeve;

[0025] 20. Fixed base; 21. Side frame;

[0026] 30. Top seat;

[0027] 40. Lifting hydraulic cylinder; 41. Piston rod; 42. Connecting plate;

[0028] 50. Vacuum exhaust fan;

[0029] 60. Lost foam casting sand box. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments and accompanying drawings. 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.

[0031] In the description of this utility model, it should be understood that the terms "center", "vertical", "horizontal", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of this utility model and to simplify the description, and do not indicate or imply that the device or component 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.

[0032] Vacuum exhaust devices for lost foam castings, such as Figures 1-4As shown, the system includes a fixed base 20 for placing several sets of lost foam casting sand boxes 60, a liftable vacuum exhaust hood 10 installed above the fixed base 20, and a vacuum exhaust machine 50. It also includes two sets of synchronously operating lifting hydraulic cylinders 40 for adjusting the liftable vacuum exhaust hood 10, and a top seat 30 for fixing the lifting hydraulic cylinders 40. A pouring pipe 11 for conveying liquid casting raw materials is installed on one side of the liftable vacuum exhaust hood 10. A replaceable horizontal pipe 12 is connected to the end of the pouring pipe 11. Branch pipes 15, the same number and corresponding in position as the lost foam casting sand boxes 60, are installed on the bottom of the outer wall of the replaceable horizontal pipe 12. An exhaust pipe 13 is installed on the top of the side of the liftable vacuum exhaust hood 10 away from the pouring pipe 11. Side frames 21 are vertically installed at the middle of both ends of the fixed base 20, and both ends of the top seat 30 are respectively connected to the tops of the two sets of side frames 21. The air inlet of the vacuum exhaust machine 50 is connected to... The exhaust pipes 13 are connected by stretchable corrugated metal pipes 14. A fixed base 20 is provided to securely hold several sets of lost foam casting sand boxes 60. A liftable vacuum exhaust hood 10, installed above the fixed base 20, works in conjunction with two sets of synchronously operating lifting hydraulic cylinders 40 and a fixed top seat 30 to achieve flexible lifting and lowering of the vacuum exhaust hood 10. Simultaneously, a pouring pipe 11 installed on one side of the liftable vacuum exhaust hood 10, along with its connected replaceable horizontal pipe 12 and branch pipe 15, ensures that liquid casting raw materials are accurately delivered to each lost foam casting sand box 60. Furthermore, the exhaust pipes 13, in conjunction with the vacuum exhaust machine 50 and the stretchable corrugated metal pipes 14, effectively achieve vacuum exhaust, promptly removing gases generated during the casting process and improving casting quality. The entire device is compact, easy to operate, and significantly improves the production efficiency and product quality of lost foam castings.

[0033] Furthermore, a connecting sleeve 16, which is adapted to the end size of the casting pipe 11 and is plugged into the top of the outer wall of the replaceable horizontal pipe 12, is installed, making the connection between the casting pipe 11 and the replaceable horizontal pipe 12 more stable and easier to disassemble and replace, thereby improving the flexibility and practicality of the device.

[0034] It is worth noting that the height of the side frame 21 is more than twice the height of the liftable vacuum exhaust hood 10, the width of the liftable vacuum exhaust hood 10 is the same as the distance between the two sets of side frames 21, and the side wall of the liftable vacuum exhaust hood 10 slides in conjunction with the outer wall of the side frame 21 to ensure the stability and accuracy of the exhaust hood during the lifting process.

[0035] It is worth noting that the bottom area of ​​the fixed base 20 is larger than the bottom area of ​​the liftable vacuum exhaust hood 10, which increases the stability of the device, prevents possible shaking or tilting during operation, and ensures the safety and quality of casting production.

[0036] The piston rod 41 of the lifting hydraulic cylinder 40 is coaxially connected to the bottom of the connecting plate 42, which enables the piston rod 41 to be stably and firmly connected to the liftable vacuum exhaust hood 10, thereby improving the reliability and stability of the lifting action.

[0037] In addition, the connecting plate 42 is connected to the top surface of the liftable vacuum exhaust hood 10 by at least two sets of fixing bolts, which facilitates installation and disassembly, and also provides convenience for the maintenance and upkeep of the device.

[0038] The working principle of the vacuum exhaust device for this lost foam casting:

[0039] First, several sets of lost foam casting sand boxes 60 are placed on the fixed base 20, which provides stable support for the sand boxes. Then, two sets of lifting hydraulic cylinders 40 are activated. The piston rod 41 of the lifting hydraulic cylinder 40 pushes the connecting plate 42 under hydraulic action. The connecting plate 42 drives the liftable vacuum exhaust hood 10 to slide down along the outer wall of the side frame 21 through the fixing bolts until the liftable vacuum exhaust hood 10 is in close contact with the fixed base 20.

[0040] Then, the pouring pipe 11 is inserted and matched with the connecting sleeve 16 on the replaceable horizontal pipe 12. The liquid casting raw material is accurately injected into the lost foam casting sand box 60 through the pouring pipe 11, the replaceable horizontal pipe 12 and the branch pipe 15.

[0041] During the casting process, the vacuum exhaust fan 50 is connected to the exhaust pipe 13 through the stretchable metal bellows 14, which extracts the gas in the liftable vacuum exhaust hood 10 to form a vacuum environment, which is conducive to the liquid casting raw material filling the model in the sand box better.

[0042] After the casting is completed, the lifting hydraulic cylinder 40 is activated to raise the liftable vacuum exhaust hood 10, and the cast lost foam casting sand box 60 is taken out, thus completing the entire operation process.

[0043] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A vacuum exhaust device for lost foam castings, characterized in that: It includes a fixed base (20) for placing several sets of lost foam casting sand boxes (60), a liftable vacuum exhaust hood (10) installed above the fixed base (20), and a vacuum exhaust machine (50), as well as two sets of synchronously working lifting hydraulic cylinders (40) for adjusting the liftable vacuum exhaust hood (10) and a top seat (30) for fixing the lifting hydraulic cylinders (40). A pouring pipe (11) for conveying liquid casting raw materials is installed on one side of the liftable vacuum exhaust hood (10). A replaceable horizontal pipe (12) is connected to the end of the pouring pipe (11). A branch pipe (15) with the same number and corresponding position as the lost foam casting sand box (60) is installed on the bottom of the outer wall of the replaceable horizontal pipe (12). An exhaust pipe (13) is installed on the top of the side of the liftable vacuum exhaust hood (10) away from the pouring pipe (11). The fixed base (20) has side frames (21) vertically installed at the middle of both ends, and the top seat (30) is connected to the top of the two sets of side frames (21) at both ends respectively; The air inlet of the vacuum exhaust machine (50) is connected to the exhaust pipe (13) by a stretchable metal bellows (14).

2. The vacuum exhaust device for lost foam castings according to claim 1, characterized in that: The top of the outer wall of the replaceable horizontal tube (12) is fitted with a connecting sleeve (16) that is compatible with the end size of the casting pipe (11) and is plugged in.

3. The vacuum exhaust device for lost foam castings according to claim 1, characterized in that: The height of the side frame (21) is more than twice the height of the liftable vacuum exhaust hood (10).

4. The vacuum exhaust device for lost foam castings according to claim 1, characterized in that: The width of the liftable vacuum exhaust hood (10) is the same as the distance between the two sets of side frames (21), and the side wall of the liftable vacuum exhaust hood (10) slides with the outer wall of the side frame (21).

5. The vacuum exhaust device for lost foam castings according to claim 1, characterized in that: The bottom area of ​​the fixed base (20) is larger than the bottom area of ​​the liftable vacuum exhaust hood (10).

6. The vacuum exhaust device for lost foam castings according to claim 1, characterized in that: The piston rod (41) of the lifting hydraulic cylinder (40) is coaxially connected to a connecting plate (42) at the bottom.

7. The vacuum exhaust device for lost foam castings according to claim 6, characterized in that: The connecting plate (42) is connected to the top surface of the liftable vacuum exhaust hood (10) by at least two sets of fixing bolts.

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