Radiation heat transfer charging barrel water jacket for extrusion casting machine

Abstract

A radiation heat transfer charging barrel water jacket for an extrusion casting machine is mainly composed of a shell, an upper end cover, a lower end cover and an oil conveying pipe. The shell wraps the charging barrel to reduce heat loss, the vacuum heat preservation layer is arranged between the oil conveying pipe and the shell, and the heat preservation effect is improved. A temperature sensor is arranged in the internal rotary oil conveying pipe to monitor oil temperature, and temperature stability of molten aluminum is guaranteed. Due to the design of the vacuum heat preservation layer between the oil conveying pipe and the shell, heat exchange between the charging barrel and the surrounding environment is effectively reduced, and the temperature of molten aluminum in the charging barrel can be kept stable. The design of the internal rotary oil conveying pipe ensures that oil can be more uniformly distributed in the water jacket, so that the charging barrel is more uniformly heated, the phenomenon of local overheating or supercooling is avoided, and the forming precision and the product quality of die-casting products are improved. High-temperature oil flows in the closed oil conveying pipe, so that even if the charging barrel water jacket is damaged due to collision or thermal deformation, the high-temperature oil cannot directly leak to cause danger and pollution.

Description

Technical Field

[0001] The utility model relates to the field of casting equipment, in particular to a radiative heat transfer barrel water jacket for an extrusion casting machine. Background Art

[0002] Extrusion casting is a process method for obtaining high-quality aluminum alloy parts. Among the numerous process parameters of extrusion casting, the stability and accuracy of the molten aluminum temperature are particularly important. This is because the temperature has a great influence on the flow and solidification behavior of the molten aluminum in the cavity. During the use of existing extrusion casting machines, since the barrel dissipates heat to the surrounding environment through heat conduction, convection, radiation, etc., there is a large temperature difference between the barrel and the molten aluminum, resulting in a difference between the molten aluminum temperature and the process set value. Especially when the volume of the formed part is small and the pouring amount of the molten aluminum is small, the influence of the barrel on the molten aluminum temperature is more severe. Such temperature fluctuations not only affect the forming accuracy of the casting product, but may also cause internal defects in the product, such as shrinkage cavities, porosity, etc., thus seriously reducing the mechanical properties and appearance quality of the product.

[0003] On the other hand, the inventor found in actual work that the influence of the barrel on the molten aluminum temperature cannot be compensated by simply increasing the molten aluminum temperature, mainly because the day-night temperature difference and the change range of the air circulation speed in the casting workshop are very large. At present, although there are some heat preservation measures on the market to slow down the temperature reduction of the barrel, the effect is not ideal. For example, simply wrapping the barrel with heat preservation materials can reduce some heat loss, but it cannot accurately control the barrel temperature, and the heat preservation materials are easy to age and need to be replaced frequently, increasing the production cost and maintenance difficulty.

[0004] In view of the above problems, the utility model designs a radiative heat transfer barrel water jacket for an extrusion casting machine. This water jacket mainly implements the adiabatic heat preservation function through the principle of radiative heat transfer, and has a compact structure and reasonable design, which can efficiently and stably control and stabilize the barrel temperature to ensure that the molten aluminum maintains a better temperature during the extrusion casting process. Summary of the Utility Model

[0005] In view of the problem that the barrel has a significant influence on the molten aluminum temperature, the utility model proposes a radiative heat transfer barrel water jacket for an extrusion casting machine, which can efficiently and stably control the barrel temperature to ensure that the molten aluminum maintains a stable optimal temperature during the die casting process.

[0006] The specific technical solution adopted by the utility model is: it is composed of four parts: a shell, an upper end cover, a lower end cover, and an oil pipeline; among them, the shell is used to wrap and protect the barrel to reduce heat loss; the upper end cover and the lower end cover are used to form a closed heat preservation space in combination with the shell; the oil pipeline is used to input heat into the heat system formed by the device; the inside of the shell is evacuated to further improve its heat preservation effect.

[0007] The specific technical solution adopted by the present utility model is as follows: The device includes a housing module, an oil pipeline module, and a vacuum pumping module; the housing module includes a housing, an upper end cover, a lower end cover, and a sealing ring; the oil pipeline module includes an oil pipeline, an oil inlet, and an oil outlet; the vacuum pumping module includes a vacuum pump, a vacuum pumping port, and a one-way air valve; the housing is tubular as a whole, and the pipe wall of the housing is a hollow structure; the upper end cover is annular, and in addition to having an annular feature, the lower end cover also has a flange structural feature; the upper end cover and the lower end cover are both fixedly connected to the housing; the sealing ring is located at the mating surfaces of the housing, the upper end cover, and the lower end cover, playing a role in improving airtightness. The oil pipeline is coiled in the hollow structure of the pipe wall of the housing, and the oil inlet and the oil outlet are fixed and exposed outside the housing, and are respectively connected to both ends of the oil pipeline in the hollow structure of the pipe wall of the housing for the inflow of oil and the discharge of gas in the oil pipeline; the vacuum pumping port is located at the upper part of the housing, and the hollow structure of the pipe wall of the housing is sequentially connected to the vacuum pumping port, the one-way air valve, and the vacuum pump. The housing is made of a high-strength heat-resistant metal material, preferably a nickel-based alloy material; the correct installation position of the barrel water jacket is nested outside the barrel; the thickness of the water jacket is 1 / 5 to 1 / 3 of the outer diameter of the barrel.

[0008] Compared with the prior art, the present utility model has remarkable advantages and beneficial effects, which are specifically reflected in the following aspects:

[0009] The barrel water jacket has a vacuum hollow structure, forming an adiabatic and heat-insulating effect, effectively reducing the heat exchange between the barrel and the surrounding environment to maintain the stability of the molten aluminum temperature in the barrel;

[0010] In the hollow structure of the barrel water jacket, a coiled oil pipeline is provided, and high-temperature oil is passed through the oil pipeline; through the principle of radiation heat transfer, the heat in the high-temperature oil is stably transferred to the contact surface between the barrel and the water jacket;

[0011] The high-temperature oil flows in the closed oil pipeline. Therefore, even if the barrel water jacket is damaged due to collision or thermal deformation, the high-temperature oil will not directly leak, causing danger and pollution.

[0012] In addition to the purposes, features, and advantages described above, the present utility model has other purposes, features, and advantages. The following will refer to the drawings to further elaborate on the present utility model in detail. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The accompanying drawings forming a part of the present specification are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model and do not constitute an improper limitation to the present utility model. In the drawings:

[0014] Figure 1 It is a schematic diagram of the internal structure of the device of the present utility model;

[0015] Figure 2 Schematic diagram of the oil pipeline structure of the device of the present utility model;

[0016] Figure 3 External view schematic diagram of the barrel water jacket of the device of the present utility model;

[0017] In the figure: 1, barrel; 2, water jacket; 3, housing; 4, upper end cover; 5, lower end cover; 6, oil pipeline; 7, oil inlet; 8, cleaning port; 9, vacuum pumping hole; 10, oil outlet. Specific implementation manners

[0018] In order to enable those skilled in the art of the present technology to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0019] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances so as to describe the embodiments of the present utility model here. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device including a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0020] It should be noted that the terms used herein are only for describing specific implementation manners and are not intended to limit the exemplary implementation manners according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprise" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] As Figure 1 and Figure 3 shown, a radiation heat transfer barrel water jacket for an extrusion casting machine in this embodiment is characterized in that:

[0022] The water jacket 2 is nested and wrapped around the outer surface of the barrel 1, which plays a role in protecting the barrel 1 and actively maintaining the temperature stability of the barrel 1; the overall thickness of the water jacket 2 is 1 / 5 to 1 / 3 of the diameter of the barrel 1, and the highest temperature that the constituent material can withstand is not less than 600 °C.

[0023] The components of the water jacket 2 include: a housing module, an oil pipeline module, and a vacuum pumping module.

[0024] The housing module includes a housing 3, an upper end cover 4, a lower end cover 5, and a sealing ring. The housing 3 is tubular as a whole, and the tube wall of the housing 3 is a hollow structure; the upper end cover 4 is annular, and the lower end cover 5 has a flange structure in addition to the annular feature. In this embodiment, the upper end cover 4 and the lower end cover 5 are fixedly connected to the housing 3 by a welding process to form an integral body, and the airtightness of the connection body is detected by an airtightness test after welding.

[0025] In different embodiments, the upper end cover 4, the lower end cover 5, and the housing 3 can also be formed into an integral body by a threaded connection method. The sealing ring is located at the mating surfaces of the housing 3, the upper end cover 4, and the lower end cover 5, which plays a role in improving airtightness.

[0026] Preferably, the housing 3 is made of a high-strength heat-resistant metal material, preferably a nickel-based alloy material;

[0027] Preferably, the thickness of the housing 3 is 1 / 5 to 1 / 3 of the outer diameter of the barrel 1.

[0028] The oil pipeline module includes an oil pipeline 6, an oil inlet 7, and an oil outlet 10;

[0029] The oil pipeline 6 is located inside the housing 3 and forms a sealed environment with the housing 3, the upper end cover 4, and the lower end cover 5. Vacuum pumping operations can be performed through the vacuum pumping hole 9 to form a vacuum insulation layer;

[0030] An oil inlet 7 and an oil outlet 10 are respectively opened on the outer wall of the housing 3. Both the oil inlet 7 and the oil outlet 10 are fixed on one side and exposed outside the housing 3, and the other side is connected to the two ends of the oil pipeline 6 respectively in the hollow structure of the tube wall of the housing 3, which is used for the inflow of high-temperature oil and the discharge of the gas inside the oil pipeline 6;

[0031] The temperature of the high-temperature oil is between 300 - 500 °C;

[0032] Preferably, the oil pipeline 6 is made of metal material, preferably high-temperature resistant stainless steel, and the pipe wall thickness is not less than 1.2 millimeters;

[0033] Such as Figure 2As shown, preferably, the oil pipeline 6 is arranged in the hollow structure of the housing 3 in a "vertically penetrating" coiled manner; the turning part of the oil pipeline 6 is horizontally oriented, and the outer diameter of this part of the oil pipeline 6 is larger than that of the vertically oriented part of the oil pipeline 6; due to the above-mentioned dimensional difference, the vertically oriented part of the oil pipeline 6 cannot be in direct contact with the housing 3, so heat transfer between the vertically oriented part of the oil pipeline 6 and the housing 3 can only be carried out through the principle of radiative heat transfer.

[0034] Preferably, the outer diameter of the horizontally oriented part of the oil pipeline 6 is increased by externally nesting a metal sleeve; due to the externally nested metal sleeve, the heat transfer efficiency between the horizontally oriented part of the oil pipeline 6 and the housing 3 is also low.

[0035] The vacuum pumping module includes a vacuum pump, a vacuum pumping port 9 and a one-way air valve.

[0036] In this embodiment, the vacuum pumping port 9 is located on the upper surface of the upper end cover 4, and the internal hollow structure of the housing 3 is sequentially connected to the one-way air valve and the vacuum pump through the vacuum pumping port 9. The vacuum degree of the internal hollow structure of the housing 3 is maintained by the vacuum pump, and the one-way air valve ensures that external air does not enter the internal hollow structure of the housing 3 when the vacuum pump is not turned on.

[0037] To facilitate the cleaning of the oil pipeline 6, a plurality of cleaning ports 8 are opened in the horizontally oriented part at the lower part of the oil pipeline 6; in this embodiment, the number of the oil outlet ports 8 is 6; in the normal working state of the water jacket 2, the cleaning ports 8 are closed by countersunk head screws; when cleaning the oil pipeline 6, the cleaning ports 8 are opened by unscrewing the countersunk head screws, and then the sediments inside the oil pipeline 6 are removed.

[0038] A radiative heat transfer barrel water jacket for an extrusion casting machine in this embodiment has the following working process:

[0039] 1) The internal hollow structure of the housing 3 is evacuated through the vacuum pumping hole 9 to obtain a vacuum insulation layer;

[0040] 2) The oil inlet port 7 and the oil outlet port 10 are opened, and high-temperature oil flowing in a cycle is introduced into the oil pipeline 6. The flow rate of the high-temperature oil is adjusted by an external oil pump, and the temperature of the high-temperature oil is maintained by a heating device in the oil tank.

[0041] 3) During continuous extrusion casting, if the temperature of the barrel 1 fluctuates greatly, while increasing the flow rate of the high-temperature oil in the oil pipeline 6, the temperature of the high-temperature oil is increased to finally slow down the temperature fluctuation of the barrel 1.

[0042] 4) After long-term operation, impurities in the high-temperature oil are deposited in the horizontally oriented part at the lower part of the oil pipeline 6, so the oil pipeline 6 needs to be cleaned. At this time, the cleaning ports 8 are opened by unscrewing the countersunk head screws, and the oil and sediments in the oil pipeline 6 are poured out.

[0043] The vacuum hollow structure of the device in this embodiment forms an adiabatic and heat-insulating effect, effectively reducing the heat exchange between the barrel and the surrounding environment to maintain the stability of the molten aluminum temperature in the barrel. In the hollow structure of the water jacket 2, there is a coiled oil delivery pipe 6. Through the principle of radiation heat transfer, the heat in the high-temperature oil in the oil delivery pipe 6 is stably transferred to the contact surface between the barrel and the water jacket. The high-temperature oil flows in the closed oil delivery pipe. Therefore, even if the barrel water jacket is damaged due to collision or thermal deformation, the high-temperature oil will not directly leak, causing danger and pollution. The efficient heat-insulating performance reduces the loss of energy during the heating process, reduces energy consumption, and meets the requirements of energy conservation and emission reduction. The device structure in this embodiment is simple and compact, which can fully slow down the temperature fluctuation of the molten aluminum in the barrel, thus ensuring the quality of die-cast products.

[0044] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of the present invention. At the same time, it should be understood that for the convenience of description, the dimensions of each part shown in the drawings are not drawn according to the actual proportional relationship. Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the said technologies, methods, and devices should be regarded as part of the authorization specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0045] For the convenience of description, spatial relative terms such as "above", "on top of", "on the upper surface", "above" can be used here to describe the spatial position relationship between a device or feature shown in the figure and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the figure for the device. For example, if the device in the figure is inverted, the device described as "above other devices or structures" or "on top of other devices or structures" will then be positioned as "below other devices or structures" or "beneath other devices or structures". Thus, the exemplary term "above" can include both the orientations of "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the corresponding explanations are made for the spatial relative descriptions used here.

[0046] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary explanation, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present utility model; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0047] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included in the protection scope of the present utility model.

Claims

1. A radiation heat transfer barrel water jacket for an extrusion casting machine, characterized in that: The water jacket (2) is nested and wrapped around the outer surface of the barrel (1), and the overall thickness of the water jacket (2) is 1 / 5 to 1 / 3 of the outer diameter of the barrel (1); the components of the water jacket (2) include: a housing module, an oil pipeline module and a vacuum module; The housing module comprises a housing (3), an upper end cover (4), a lower end cover (5) and a sealing ring; the housing (3) is tubular as a whole, and the tube wall of the housing (3) is a hollow structure; the upper end cover (4) is annular, and the lower end cover (5) has a flange structure in addition to the annular feature; the upper end cover (4) and the lower end cover (5) are fixedly connected to the housing (3) to form a whole, and the three together form a closed environment; The oil pipeline module comprises an oil pipeline (6), an oil inlet (7) and an oil outlet (10); the oil pipeline (6) is located in the hollow structure of the tube wall of the shell (3); the oil inlet (7) and the oil outlet (10) are both fixed on one side and exposed outside the shell (3), and the other side is respectively connected to the two ends of the oil pipeline (6) in the hollow structure of the tube wall of the shell (3); The vacuum pumping module comprises a vacuum pump, a vacuum pumping port (9) and a one-way air valve; the vacuum pumping port (9) is arranged on the upper surface of the upper end cover (4); the hollow structure of the tube wall of the shell (3) is connected to the one-way air valve and the vacuum pumping machine in sequence through the vacuum pumping port (9).

2. The radiation heat transfer barrel water jacket for an extrusion casting machine according to claim 1, characterized in that: The oil pipeline (6) is coiled in the hollow structure of the tube wall of the shell (3); the turning portion of the oil pipeline (6) is horizontally oriented, and the outer diameter of this portion of the oil pipeline (6) is larger than that of the vertically oriented portion of the oil pipeline (6); and a plurality of cleaning ports (8) are provided in the horizontally oriented portion at the bottom of the oil pipeline (6).

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