Transition pipe for low-pressure casting

Abstract

The utility model discloses a transition pipe for low-pressure casting, which belongs to the technical field of low-pressure casting and comprises an outer cylinder, a connecting seat and an inner cylinder, the connecting seat is fixed on the outer wall of the lower half part of the outer cylinder, the inner cylinder is movably connected in the outer cylinder, a plurality of radiating fins are fixed on the outer wall of the inner cylinder, a plurality of heating rings are mounted on the outer wall of the outer cylinder, and the heating rings are fixed on the connecting seat. The multiple heating rings are evenly distributed among the multiple heat dissipation fins, inner threaded grooves are formed in the inner walls of the upper end and the lower end of the outer cylinder, heat insulation pads are connected to the inner threaded grooves in the upper end and the lower end of the outer cylinder in an external threaded mode, mounting grooves are formed in the outer walls of the heat insulation pads, and sealing rings are fixed into the mounting grooves of the heat insulation pads. The transition pipe for low-pressure casting solves the problems that an existing transition pipe is inconvenient to clean frozen aluminum, unstable in molten aluminum temperature, poor in sealing performance, large in influence on casting mold pressure and the like, the cleaning cost is reduced, and the product quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to low pressure casting technical field, and specifically relates to a transition pipe for low pressure casting. BACKGROUND

[0002] In common low pressure casting production, the liquid lifting pipe is located in the furnace. When the casting mold is simple, the casting mold can be directly aligned with the furnace mouth. However, when the casting mold is complex or has special treatment requirements for the filled aluminum liquid, a transition section is needed to be added to the liquid lifting pipe outside the pouring furnace to extend to the casting mold. The traditional transition structure is sequentially connected with the casting mold through the liquid lifting pipe, the intermediate pipe, the heat preservation cup and the pouring bushing, and the pouring is completed after reaching the required height.

[0003] The existing transition pipe structure has many deficiencies in actual application. For example, when the traditional transition structure is imperfect in heat preservation measures, the furnace outside part is prone to form the "frozen aluminum" phenomenon. In the continuous pouring operation process, the aluminum skin attached to the inner wall of the transition structure can be brought into the casting mold, leading to uneven melt composition and affecting the product performance. Moreover, the unstable aluminum liquid temperature and poor sealing effect also have adverse effects on the product quality and production safety. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a transition pipe for low pressure casting to solve the problems of inconvenient frozen aluminum cleaning, unstable aluminum liquid temperature and poor sealing effect in the prior art.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a transition pipe for low pressure casting, comprising an outer cylinder, a connecting seat and an inner cylinder, the connecting seat is fixed to the lower half outer wall of the outer cylinder, the inner cylinder is movably connected in the outer cylinder, the outer wall of the inner cylinder is fixed with a plurality of heat dissipation fins, and the outer wall of the outer cylinder is provided with a plurality of heating rings, the plurality of heating rings are evenly distributed between the plurality of heat dissipation fins, the inner threads grooves are formed in the inner walls of the upper and lower ends of the outer cylinder, the heat insulation pads are connected with the inner threads grooves of the upper and lower ends of the outer cylinder through external threads, the mounting grooves are formed in the outer walls of the heat insulation pads, and the sealing rings are fixed in the mounting grooves of the heat insulation pads.

[0006] In further embodiments, the inner cylinder is made of a new type of composite ceramic material, and the inner wall of the inner cylinder is coated with a nano-level high-temperature-resistant and anti-sticking aluminum coating.

[0007] In further embodiments, the heat insulation pad adopts a multi-layer composite structure with a ceramic fiber felt inner layer and a flexible graphite material outer layer, and the sealing ring is made of fluorine rubber material.

[0008] In a further embodiment, a wiring hole is formed in the top of the heat insulation pad, and a heat insulation tube is fixed in the wiring hole of the top of the heat insulation pad.

[0009] In a further embodiment, a plurality of connecting holes are uniformly distributed on the connecting seat, and the axis of the connecting hole is parallel to the axis of the barrel body.

[0010] The technical effects and advantages of the present application are as follows:

[0011] The transition pipe for low-pressure casting has the following advantages: the inner barrel is detachable, and the inner barrel is made of a new type of composite ceramic material; when cleaning frozen aluminum, the inner barrel can be taken out from the outer barrel; for stubborn frozen aluminum, the characteristics of the composite ceramic material can be used to clean the frozen aluminum easily by local heating or mechanical vibration; the entire transition pipe does not need to be replaced, which greatly reduces the cleaning cost and operation difficulty;

[0012] The heating ring can accurately control the temperature of the aluminum liquid in the inner barrel, avoid product quality problems caused by temperature fluctuations, improve the consistency and performance stability of the product, and the heat dissipation fins on the outer wall of the inner barrel enhance the heat exchange efficiency, which is helpful for quickly adjusting the temperature of the aluminum liquid;

[0013] The multi-layer composite structure design of the heat insulation pad significantly improves the sealing effect, effectively prevents aluminum liquid leakage, reduces safety hazards and material waste in the production process, and the use of the sealing ring further enhances the reliability of the sealing; the transition pipe for low-pressure casting solves the problems of inconvenient cleaning of frozen aluminum, unstable aluminum liquid temperature, poor sealing, and large influence on the casting pressure of the existing transition pipe, reduces the cleaning cost, and improves the product quality. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0015] Figure 1 The figure is a structural schematic view of the present application;

[0016] Figure 2 The figure is a structural schematic view of the outer barrel of the present application;

[0017] Figure 3 The figure is a structural schematic view of the inner barrel of the present application;

[0018] Figure 4 The figure is a structural schematic view of the heat insulation pad of the present application.

[0019] In the figure: 1, outer cylinder; 2, connecting seat; 3, inner cylinder; 4, heat dissipation fin; 5, heating ring; 6, heat insulation pad; 7, sealing ring; 8, heat insulation tube. DETAILED DESCRIPTION

[0020] In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, it will be apparent to one skilled in the art that the present application can be practiced without one or more of these specific details. In other instances, well-known features have not been described in detail in order to avoid unnecessarily complicating the present application.

[0021] Unless the context clearly requires otherwise, throughout the description, the words "comprise," "comprising," "include," "including," and the like are to be construed in an inclusive sense, as opposed to an exclusive or exhaustive sense; that is to say, in the sense of "including, but not limited to." As used herein, the terms "coupled" and "coupling" refer to an electrical connection, physical attachment, or functional cooperation between or among the elements, components, or devices being referred to, whether direct or indirect, and whether temporary or permanent.

[0022] The present application provides a transition pipe for low pressure casting as shown in Figures 1-4 The connecting seat 2 is welded to the lower half of the outer wall of the outer cylinder 1, and a plurality of connecting holes are uniformly distributed on the connecting seat 2, the axis of the connecting hole is parallel to the axis of the cylinder body, this design makes the installation of the transition pipe convenient and stable, in actual operation, the workers can use the connecting pieces such as bolts, nuts, etc. to accurately butt joint and firmly fix the connecting seat 2 with the relevant equipment such as pouring furnace, casting mold, etc. This installation method not only ensures the stability of the transition pipe during work, but also effectively avoids the problems of aluminum liquid leakage or unstable pressure caused by loose connection, and lays a solid foundation for subsequent casting operation.

[0023] The inner cylinder 3 is movably connected in the outer cylinder 1, the inner cylinder 3 is made of a new type of composite ceramic material, the inner wall of the inner cylinder 3 is coated with a nano-level high-temperature-resistant and anti-sticking aluminum coating, the material properties and coating design of the inner cylinder 3 also provide a strong guarantee for its application in low pressure casting, the inner cylinder 3 is made of a new type of composite ceramic material, which has excellent high-temperature-resistant performance and can withstand the high-temperature environment of the aluminum liquid during low pressure casting, at the same time, the nano-level high-temperature-resistant and anti-sticking aluminum coating coated on the inner wall plays an important role, which can effectively prevent the aluminum liquid from sticking to the inner wall of the inner cylinder 3 during the aluminum liquid conveying process, reduce the generation of aluminum skin, and avoid the aluminum skin being brought into the casting mold to affect the melt composition and product performance, the transition pipe with this inner cylinder 3 structure effectively reduces the product rejection rate caused by the aluminum skin problem, and significantly improves the product quality.

[0024] The inner cylinder 3 is movably connected in the outer cylinder 1, which provides great convenience for cleaning frozen aluminum. When it is necessary to clean frozen aluminum, the staff only needs to carefully take out the inner cylinder 3 from the outer cylinder 1 according to the standard operation process. For stubborn frozen aluminum, local heating or mechanical vibration is used for cleaning by taking advantage of the characteristics of the new composite ceramic material used in the inner cylinder 3. For example, a small heating device is used for local heating of the frozen aluminum attachment part. Due to the good high-temperature resistance of the composite ceramic material, its own structure will not be damaged during heating, and the frozen aluminum will gradually soften and fall off after being heated. Or a special mechanical vibration tool is used to vibrate the part of the inner cylinder 3 where the frozen aluminum is attached, which makes the frozen aluminum more easily separated from the inner cylinder 3 wall, thereby achieving easy cleaning and avoiding the high cost and cumbersome operation of replacing the whole transition pipe in the traditional way.

[0025] A plurality of heat dissipation fins 4 are welded to the outer wall of the inner cylinder 3, the heat dissipation fins 4 are in close contact with the inner wall of the outer cylinder 1, and a plurality of heating rings 5 are installed on the outer wall of the outer cylinder 1. The plurality of heating rings 5 are evenly distributed between the plurality of heat dissipation fins 4. The cooperation of the plurality of heat dissipation fins 4 and the heating rings 5 realizes precise control of the temperature of the aluminum liquid. When the temperature of the aluminum liquid is low, the heating rings 5 are started, and the heat generated by the heating rings 5 can be quickly transferred to the aluminum liquid in the inner cylinder 3, so that the temperature of the aluminum liquid is increased and maintained within the appropriate casting temperature range. The heat dissipation fins 4 play a role when it is necessary to reduce the temperature of the aluminum liquid. They increase the heat exchange area and enhance the heat exchange efficiency, which can quickly dissipate the heat in the inner cylinder 3 to the surrounding environment, helping to quickly adjust the temperature of the aluminum liquid. In actual casting production line, through the cooperative control of the heating rings 5 and the heat dissipation fins 4, the temperature of the aluminum liquid can be flexibly adjusted according to different casting process requirements, to ensure the consistency and stability of product quality.

[0026] The inner wall of the upper and lower ends of the outer cylinder 1 is provided with an internal thread groove, and the internal thread groove of the upper and lower ends of the outer cylinder 1 is externally threadedly connected with a heat insulation pad 6. The outer wall of the heat insulation pad 6 is provided with a mounting groove, and the mounting groove of the heat insulation pad 6 is fixedly provided with a sealing ring 7. The heat insulation pad 6 adopts a multi-layer composite structure with a ceramic fiber felt inner layer and a flexible graphite material outer layer. The sealing ring 7 is made of fluororubber material. The ceramic fiber felt has good heat insulation performance, which can effectively block the heat dissipation through the two ends of the outer cylinder 1. The flexible graphite material has good flexibility and sealing performance, which can tightly fit the inner wall of the outer cylinder 1 and other connecting components. The sealing ring 7 is made of fluororubber material, which further enhances the sealing effect. The top of the heat insulation pad 6 is provided with a wire hole, and the wire hole in the top of the heat insulation pad 6 is fixedly provided with a heat insulation pipe 8. The external wires can be connected with the heating rings 5 through the heat insulation pipe 8 for power supply of the heating rings 5. The heat insulation pipe 8 can effectively protect the wires.

[0027] The standard parts used in the utility model can be purchased from the market, the special-shaped parts can be ordered according to the description and the drawings, the specific connection mode of each part adopts the conventional means such as bolt, rivet and welding in the prior art, the machinery, parts and equipment adopt the conventional type in the prior art, the circuit connection adopts the conventional connection mode in the prior art, and the details are not described herein, the control mode of the utility model is controlled through the controller, the control circuit of the controller can be realized through simple programming of the person skilled in the art, and the contents not described in detail in the specification belong to the prior art known by the person skilled in the art.

[0028] In the description of the utility model, it is understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0029] Working principle:

[0030] The transition pipe for low-pressure casting is connected and fixed with other equipment through the connecting hole on the connecting seat 2 in the low-pressure casting process, the molten aluminum is transported through the inner cylinder 3, the heating ring 5 works to heat the molten aluminum in the inner cylinder 3, the temperature of the molten aluminum is kept stable, the heat exchange efficiency is enhanced by the heat dissipation fins 4, the temperature of the molten aluminum can be quickly adjusted according to the requirement, the multilayer composite structure of the heat insulation pad 6 effectively insulates heat and reduces heat loss, the sealing ring 7 prevents the molten aluminum from leaking, when the aluminum freezing occurs, the operation is stopped, the inner cylinder 3 is taken out from the outer cylinder 1, the characteristics of the composite ceramic material are utilized, the aluminum freezing is cleaned through local heating or mechanical vibration, the inner cylinder 3 is reinstalled after cleaning, and the casting operation is continued.

[0031] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A transition pipe for low-pressure casting, comprising an outer cylinder (1), a connecting seat (2), and an inner cylinder (3), characterized in that: The connecting seat (2) is fixed to the lower half of the outer wall of the outer cylinder (1). The inner cylinder (3) is movably connected to the outer cylinder (1). The outer wall of the inner cylinder (3) is fixed with multiple heat dissipation fins (4), and the outer wall of the outer cylinder (1) is equipped with multiple heating rings (5). The multiple heating rings (5) are evenly distributed between the multiple heat dissipation fins (4). The inner walls of the upper and lower ends of the outer cylinder (1) are provided with internal thread grooves. The internal thread grooves of the upper and lower ends of the outer cylinder (1) are externally threaded with heat insulation pads (6). The outer wall of the heat insulation pads (6) is provided with mounting grooves, and a sealing ring (7) is fixed in the mounting groove of the heat insulation pads (6).

2. A transition tube for low-pressure casting according to claim 1, characterized in that: The inner cylinder (3) is made of a new type of composite ceramic material, and the inner wall of the inner cylinder (3) is coated with a nano-level high temperature resistant and non-stick aluminum coating.

3. A transition tube for low-pressure casting according to claim 1, characterized in that: The heat insulation pad (6) adopts a multi-layer composite structure with an inner layer of ceramic fiber felt and an outer layer of flexible graphite material, and the sealing ring (7) is made of fluororubber.

4. A transition tube for low-pressure casting according to claim 3, characterized in that: The top of the heat insulation pad (6) is provided with a wiring hole, and a heat insulation tube (8) is fixed in the wiring hole at the top of the heat insulation pad (6).

5. A transition tube for low-pressure casting according to claim 1, characterized in that: The connecting seat (2) has a plurality of connecting holes evenly distributed on it, and the axis of the connecting holes is parallel to the axis of the cylinder.

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