Exhaust device for casting small diesel engine body

Abstract

The exhaust device for casting the small diesel engine body comprises a sand mold cavity exhaust structure and a plurality of air outlet pipes which are evenly distributed on the periphery of a forming cavity of an engine body casting and arranged in an outer skin sand core, and pipe openings in the lower ends of the air outlet pipes are located in the outer skin sand core and communicate with the forming cavity. And the upper port of the air outlet pipe extends out of the outer skin sand core and is communicated with an air outlet rod I positioned on the upper end surface of the outer skin sand core. On the basis of the exhaust structure of the sand mold cavity, the exhaust structure of the outer sand core is additionally arranged, so that the problem that the local shape of a casting is incomplete due to the fact that gas generated by the resin self-hardening sand machine body sand core occupies the position of the casting and cannot be exhausted is solved, the product percent of pass is improved, and the cost is saved; and the casting quality can be fundamentally improved, the structure is simple, the design is novel, the product quality is guaranteed, the casting rejection rate is reduced, and the production cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to foundry technology field, concretely relates to a kind of exhaust device for small diesel engine body casting. BACKGROUND

[0002] At present, the exhaust process of casting industry in the production of diesel engine body is to discharge the gas generated in the pouring process of inner cavity sand mold and the gas in the mold cavity, and when the above exhaust process is not thorough, it will cause the local incompleteness of casting body shape or some size deviation, some gas generated by mold cavity and sand core at high temperature iron liquid pouring or gas entrained by iron liquid during pouring, because the mold or sand core is in dead angle or corner, the gas cannot be completely excluded by using dark exhaust method, which affects the quality of product, and seriously causes casting scrap, waste and high production cost, therefore, the above problems are improved. INVENTION CONTENTS

[0003] The utility model solves the technical problem: provide a kind of exhaust device for small diesel engine body casting, on the basis of sand mold cavity exhaust structure, increase the exhaust structure to outer skin sand core, solve the problem that the gas generated by resin self-hardening sand body sand core occupies casting position and causes the incompleteness of casting local shape, improve product pass rate, save cost, and can fundamentally improve the quality of casting, simple structure, novel design, ensure product quality, reduce casting scrap rate, reduce production cost.

[0004] The utility model adopts the technical scheme: exhaust device for small diesel engine body casting, including sand mold cavity exhaust structure and multiple evenly distributed in the outer periphery of the forming cavity of body casting and located in the inside of outer skin sand core Multiple air pipes, the lower end of the air pipe is located in the outer skin sand core and is communicated with the forming cavity, the upper port of the air pipe extends out of the outer skin sand core, and is communicated with the air rod located on the upper end surface of the outer skin sand core.

[0005] Among them, the outer skin sand core is evenly distributed with multiple air positioning pipes one from bottom to top, and the end of the air pipe is inserted with the air positioning pipe one, and the lower port of the air pipe is positioned by the air positioning pipe one, the upper port of the air pipe is positioned and communicated with the air rod located outside the outer skin sand core by the air positioning pipe two, and the air rod one guides the gas in the forming cavity and body sand core during pouring to the top surface of body sand mold and exhausts.

[0006] Further, the air pipe adopts metal spiral pipe.

[0007] Further, the molten iron temperature of the in-mold cavity pouring is greater than or equal to 1375 DEG C, and the gas is rapidly discharged by rotating the metal spiral pipe by 90 degrees in less than 10s of pouring time.

[0008] Further, the sand mold cavity exhaust structure comprises a gas outlet riser and a gas outlet rod arranged on the top surface of the body sand mold.

[0009] Compared with the prior art, the utility model has the advantages of:

[0010] 1. The technical scheme increases the exhaust structure of the outer skin sand core on the basis of the sand mold cavity exhaust structure, solves the problem that the gas generated by the resin self-hardening sand body sand core occupies the position of the casting, and causes the gas to be unable to be discharged, thereby causing the local shape of the casting to be incomplete;

[0011] 2. The technical scheme adopts the metal spiral pipe which is positioned in the outer skin sand core and has an upper port communicated with the gas outlet rod, and the metal spiral pipe is rotated by 90 degrees to rapidly discharge the gas generated by the body sand core from the mold cavity in less than 10s of pouring time, thereby avoiding the gas from being rolled into the molten iron;

[0012] 3. The technical scheme has simple structure, novel design, ensures product quality, improves product qualification rate and saves cost, and can fundamentally improve the quality of the casting and reduce the production cost. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 The utility model structure schematic diagram. DETAILED DESCRIPTION

[0014] The technical scheme in the embodiments of the utility model will be clearly and completely described below. Figure 1 It is obvious that the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0015] It should be noted that, in this article, without the opposite description, it is understood that: the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" and the like are only for description purposes, and cannot be understood as indicating or implying relative importance.

[0016] In this document, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0017] Exhaust system for small diesel engine block casting, such as Figure 1 As shown, the structure includes a sand mold cavity venting structure 5 and multiple vent pipes 3 evenly distributed around the outer periphery of the molding cavity of the casting 1 and located inside the outer skin sand core 2. The lower end of the vent pipe 3 is positioned inside the outer skin sand core 2 and communicates with the molding cavity. The upper end of the vent pipe 3 extends out of the outer skin sand core 2 and communicates with the vent rod 4 positioned on the upper end face of the outer skin sand core 2. In the above structure, by adding a venting structure for the outer skin sand core 2 on the basis of the sand mold cavity venting structure, the problem of gas generated by the resin self-hardening sand casting machine core occupying the casting position and causing gas to be unable to be discharged, resulting in incomplete local shape of the casting, is solved.

[0018] The specific structure of the vent pipe 3 within the outer sand core 2 is as follows: Multiple vent positioning pipes 7, with ends flush with the inner wall of the corresponding side of the molding cavity, are evenly distributed from bottom to top within the outer sand core 2. The inner end of the vent pipe 3 is inserted into the vent positioning pipe 7, and the vent positioning pipe 7 positions the lower port of the vent pipe 3. The upper port of the vent pipe 3 is connected to the vent rod 4 located outside the outer sand core 2 via a second vent positioning pipe 6. The vent rod 4 guides the gas from the molding cavity and the machine sand core during the casting process to the machine sand core. The top surface of the mold is exposed; specifically, the vent pipe 3 is a metal spiral pipe, and specifically, the temperature of the molten iron poured into the molding cavity is greater than or equal to 1375℃, and the gas is quickly discharged through the metal spiral pipe by rotating 90 degrees within a pouring time of less than 10 seconds; in the above structure, a metal spiral pipe with its upper end connected to the vent rod is positioned inside the outer sand core 2, so that the gas generated by the machine sand core is quickly discharged from the mold cavity by rotating 90 degrees within a pouring time of less than 10 seconds, thus avoiding the gas from being drawn into the molten iron;

[0019] The existing sand mold cavity exhaust structure 5 is as follows: The sand mold cavity exhaust structure 5 includes an exhaust riser 5-1 and an exhaust rod 5-2 located on the top surface of the sand mold of the machine body.

[0020] The gas exhaust structure is added to the exhaust process of the inner cavity sand core and the mold cavity, the gas in the molten iron before the formation of the casting, the gas of the outer shape sand core and the mixed gas in the cavity are exhausted, the gas produced by the evaporation of the moisture of the phenolic resin sand core of the machine body, the combustion of the organic matter and the like is rapidly exhausted through the metal spiral pipe rotating 90 degrees within 10 seconds after the casting of the machine body, the gas defects produced during the casting of the machine body casting 1 are solved, the product qualified rate is improved, the cost is saved, and the quality of the casting is fundamentally improved.

[0021] The technical scheme has simple structure, novel design, ensures product quality, improves product qualified rate, saves cost, fundamentally improves the quality of the casting, reduces production cost, and is suitable for the exhaust of the sand core gas in the production process of other similar structure castings.

[0022] It is obvious for those skilled in the art that the utility model is not limited to the details of the above exemplary embodiments, and the utility model can be realized in other specific forms without departing from the spirit or basic characteristics of the utility model. Therefore, the embodiments should be regarded as exemplary and non-limiting from any point of view, the scope of the utility model is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the utility model. Any reference signs in the claims should not be regarded as limiting the involved claims.

[0023] In addition, it should be understood that although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical scheme, and the description manner of the specification is only for the sake of clarity, and those skilled in the art should regard the specification as a whole, and the technical schemes in each embodiment can be combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An exhaust system for casting the body of a small diesel engine, characterized in that: It includes a sand mold cavity venting structure (5) and multiple air outlet pipes (3) evenly distributed around the outer periphery of the molding cavity of the machine body casting (1) and located inside the outer skin sand core (2). The lower end of the air outlet pipe (3) is positioned inside the outer skin sand core (2) and communicates with the molding cavity. The upper end of the air outlet pipe (3) extends out of the outer skin sand core (2) and communicates with the air outlet rod (4) positioned on the upper end face of the outer skin sand core (2).

2. The exhaust device for casting a small diesel engine block according to claim 1, characterized in that: The outer sand core (2) has multiple air outlet positioning pipes (7) with their ends flush with the inner wall of the molded cavity from bottom to top. The inner end of the air outlet pipe (3) is inserted into the air outlet positioning pipe (7), and the lower port of the air outlet pipe (3) is positioned by the air outlet positioning pipe (7). The upper port of the air outlet pipe (3) is connected to the air outlet rod (4) located outside the outer sand core (2) through the air outlet positioning pipe (6). The air outlet rod (4) guides the gas in the molded cavity and the machine body sand core during the casting process to the top surface of the machine body sand mold and discharges it.

3. The exhaust device for casting a small diesel engine block according to claim 2, characterized in that: The exhaust pipe (3) is made of metal spiral tube.

4. The exhaust device for casting a small diesel engine block according to claim 3, characterized in that: The molten iron poured into the molding cavity has a temperature of 1375°C or higher, and the gas is rapidly discharged through a metal spiral tube rotated 90 degrees within a pouring time of less than 10 seconds.

5. The exhaust device for casting a small diesel engine block according to any one of claims 1-4, characterized in that: The sand mold cavity exhaust structure (5) includes an exhaust riser (5-1) and an exhaust rod (5-2) located on the top surface of the sand mold of the machine body.

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