WO2007091386A1

WO2007091386A1 - Gas feeding device and gas feeding method

Info

Publication number: WO2007091386A1
Application number: PCT/JP2007/000057
Authority: WO
Inventors: Hitoshi Mizuno
Original assignee: Hoei Shokai Co., Ltd.
Priority date: 2006-02-06
Filing date: 2007-02-05
Publication date: 2007-08-16
Also published as: JPWO2007091386A1

Abstract

[PROBLEMS] To feed molten metal to the outside of a container at an appropriate flow speed. [MEANS FOR SOLVING PROBLEMS] The device has an air hose connectable to a gas passage; a pressurized gas feeding part for feeding a pressurized gas to the container through the air hose and the gas passage; a measurement part for measuring the flow speed of the molten metal fed from the inside to the outside of the container through a flow passage and piping, the feeding of the molten metal being made by the pressurized gas flowing into the container through the air hose; and a control part for controlling the pressure value of the pressurized gas that is fed to the container, the control of the pressure value being performed such that the flow speed measured by the measurement part is set to a predetermined value.

Description

Specification

Gas supply apparatus and gas supply method

Technical field

[0001] The present invention relates to a gas supply device and a gas supply method for supplying a pressurized gas to a container used for supplying molten aluminum, for example.

Background art

[0002] In a factory where aluminum is formed using a large number of die-cast machines, aluminum materials are often supplied not only from within the factory but also from outside the factory. In this case, a container containing aluminum in a molten state can be transported from a material supply side factory to a molding side factory via a public road, and the molten material can be supplied to each die cast machine. Has been done. Conventionally used containers have a structure like a teapot in which a supply flow path is provided on the side wall of the container body in which molten metal is stored. By tilting the container, molten metal is supplied from the re-flow path to the holding furnace on the molding side (see Patent Document 1). Patent Document 1: Japanese Patent Fair 4 _ 4 6 4 6

Disclosure of the invention

Problems to be solved by the invention

[0003] The present inventors have developed a pressurized container from the viewpoint of safety and workability.

This pressurized container can also be transported between factories via public roads. Various ideas have been made for this purpose.

In such a system, molten aluminum is supplied from the container to the holding furnace side by introducing a pressurized gas into the container. Molten aluminum is supplied to the holding furnace by changing the pressure value of the pressurized gas in three stages, for example.

[0005] When supplying molten metal to the holding furnace, even if the pressure value of the pressurized gas is changed stepwise, the flow rate of the molten metal flowing out of the container may be sufficiently stabilized to be within a predetermined range. could not. For this reason, when the flow rate is outside the predetermined range, the molten metal is retained. Spattering on the surface of the molten metal stored in the holding furnace increases the oxide of the molten metal, affecting the quality of the molten metal.

[0006] The present invention addresses such problems, and an object of the present invention is to provide a gas supply device and a gas supply method that can supply molten metal to the outside of the container at an appropriate flow rate.

Means for solving the problem

[0007] A gas supply device according to the present invention is a container having a structure capable of being transported from a first factory to a second factory via a public road, can store molten metal, and is external to the container. A gas passage between the container and the inside of the container and a sealed container body having a flow path for leading the molten metal from the inside to the outside by pressurization, provided from the inner bottom to the pipe mounting portion on the upper surface, The pipe attachment portion communicates with the flow path, extends upward from the pipe attachment portion, bends in a substantially horizontal direction at a predetermined position, faces downward at a predetermined position, and the outlet of the tip portion faces downward. In a gas supply device that supplies at least pressurized gas to a container having a pipe, an air hose connectable to the gas passage, and the pressurized gas to supply the air hose and the gas passage to the container Pressurized gas supply And measuring the flow rate of the molten metal supplied from the inside of the container to the outside of the container through the flow path and the piping by flowing a pressurized gas into the container through the air hose. A measuring unit; and a control unit that controls a pressure value of the pressurized gas supplied to the container so that a flow rate measured by the measuring unit becomes a predetermined value.

[0008] According to the present invention, the flow rate is measured, and the pressure value of the pressurized gas supplied to the container is controlled accordingly, so that the flow rate of the molten metal supplied from the container falls within a predetermined range. Thus, it is possible to supply molten metal that does not deteriorate in quality while slowing the deterioration rate of the flow path and the piping, and efficiently in operation. That is, if the flow rate of the molten metal supplied is slow, the life of the flow path and the piping will be long, but the working efficiency will be poor, and if the flow rate is high, the work efficiency will be good, but the life of the flow path and the piping will be shortened. . Also, if the flow rate of the molten metal flowing out of the container is high, the liquid level of the molten metal in the holding furnace storing the molten metal supplied from the container Molten metal splatters and the quality of the molten metal deteriorates due to an increase in the oxide of the molten metal. On the other hand, even when the flow rate of the molten metal is slow, the molten metal scatters and deteriorates the quality of the molten metal. In consideration of these circumstances, the present invention measures the flow velocity and controls the pressure value of the pressurized gas supplied to the container accordingly, so that the optimum flow velocity can always be obtained.

[0009] The flow path and the pipe may have an inner diameter of 65 to 85 mm.

[0010] According to such a configuration, when the molten metal flows out of the container, the inside of the container may be pressurized with a very small pressure. That is, when the molten metal flows upward in the flow path, the two parameters, the weight of the molten metal itself existing in the flow path and the viscous resistance of the inner wall of the flow path, the resistance that hinders the flow of the molten metal. It is thought that it has had a big influence on. Here, when the inner diameter is smaller than 65 mm, the molten metal flowing through the flow path is affected by both the weight of the molten metal itself and the viscous resistance of the inner wall at any position. When it is more than mm, an area that is hardly affected by the viscous resistance of the inner wall starts to appear from around the center of the flow, and the area gradually increases. The effect of this region is very large, and the resistance that hinders the flow of molten metal begins to drop. Therefore, when the molten metal flows out of the container, it is only necessary to pressurize the container with a very small pressure. On the other hand, when the inner diameter exceeds 85 mm, the weight of the molten metal itself becomes very dominant as a resistance to inhibit the flow of the molten metal, and the resistance to inhibit the flow of the molten metal becomes large. Therefore, by setting the diameter of the first flow path to 65 to 85 mm, it is only necessary to pressurize the inside of the container with a very small pressure when the molten metal flows out of the container.

[001 1] The predetermined value may be 12 to 18 kg Z s.

[0012] According to such a configuration, it is possible to prevent the scattering at the time of supplying the molten metal, to reduce the oxide as much as possible, and to obtain a molten metal with stable quality. In addition, the work efficiency is good while slowing down the deterioration rate of the channel life. In other words, if the flow rate is slower than 12 kg Z s, the flow channel life is long but the molten metal supply takes time. The work efficiency is poor and the quality of the molten metal deteriorates due to the scattering of molten metal and the increase of oxides. On the other hand, if the flow rate is faster than 1 S kg Z s, the time required for supplying the molten metal can be shortened and work efficiency is improved while the life of the flow path is shortened, and the molten metal is scattered and oxidized. Things increase and the quality of the molten metal deteriorates. Therefore, by setting the flow rate to 12 to 18 kg Z s, it is possible to prevent the scattering at the time of supplying the molten metal, reduce the oxide as much as possible, and obtain a molten metal with stable quality.

[0013] A vacuum pump is provided that depressurizes the inside of the container via the air hose, and the measurement unit evacuates the inside of the container with the vacuum pump, thereby allowing the measurement to be performed via the pipe and the flow path. The flow rate of the molten metal supplied into the container may be measured, and the control unit may control the exhaust amount of the vacuum pump so that the flow rate measured by the measurement unit becomes a predetermined value.

[0014] According to the present invention, the flow rate is measured, and the amount of exhaust gas discharged from the vessel is controlled accordingly, so that the flow rate of the molten metal supplied to the vessel is kept within a predetermined range. It is possible to control the flow rate and the deterioration rate of the flow path and the piping, and the work efficiency is high. In other words, if the flow rate of the molten metal supplied is slow, the life of the flow path and piping is long, but the working efficiency is deteriorated. In addition, if the flow rate of the molten metal supplied is high, work efficiency is improved, but the life of the flow path and piping is shortened. In consideration of these circumstances, the present invention measures the flow velocity and controls the exhaust amount for exhausting the container accordingly, so that the optimum flow velocity can always be obtained.

[0015] The gas supply device may be mounted on a fork riff for transporting the container.

[0016] A gas supply method according to the present invention is a container having a structure capable of being transported from a first factory to a second factory via a public road, capable of storing molten metal, and external to the container. A gas passage between the container and the inside of the container and a sealed container body having a flow path for leading the molten metal from the inside to the outside by pressurization, provided from the inner bottom to the pipe mounting portion on the upper surface, The pipe attachment portion communicates with the flow path, extends upward from the pipe attachment portion, bends in a substantially horizontal direction at a predetermined position, and In a gas supply method for supplying at least pressurized gas to a container having a pipe having a leading end directed downward at a position where the outlet port of the tip portion is directed downward, the air hose connectable to the gas path, and A pressurized gas is supplied to the container via a gas passage, and the pressurized gas is flowed into the container via the air hose. The flow rate of the molten metal supplied to the outside is measured, and the pressure value of the pressurized gas supplied to the container is controlled so that the determined flow rate becomes a predetermined value.

[0017] The inside of the container is depressurized through the air hose, and the inside of the container is depressurized to measure the flow rate of the molten metal supplied into the container through the pipe and the flow path. The degree of decompression may be controlled so that the measured flow rate becomes a predetermined value.

The invention's effect

[0018] According to the present invention, the pressure difference between the inside and the outside of the container is used to slow down the deterioration rate of the flow path and the pipe through which the molten metal can flow between the outside and the piping, and the work efficiency is improved and the quality is reduced. No molten metal can be supplied.

BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0020] The molten metal supply system includes a container for storing molten metal, for example, molten aluminum, and a transport vehicle as a vehicle for holding and transporting the container.

FIG. 1 is a side view showing an appearance of a transport vehicle according to an embodiment of the present invention, and FIG. 2 is a plan view thereof.

[0022] This transport vehicle 1 basically has a base part constituted by, for example, a fork riff, and has a driver seat 2 provided substantially in the center, and a fork part 3 provided in front. This forklift is used as a base, and the pressurizing / reducing unit 4 is mounted thereon.

The pressurizing / depressurizing unit 4 includes two receiver tanks 5 for storing pressurized gas supplied to a container 100 described later, and an air compressor for supplying pressurized gas to the receiver tank 5 6.Vacuum pump for decompressing the container 7 And a filter 8 or the like.

The emergency stop unit 9 is provided on the front side of one side surface of the driver seat 2. As a result, the driver who gets in the driver's seat 2 can access the emergency stop lever 10 provided in the emergency stop section 9.

The pressurization / reduction unit 4 and the emergency stop unit 9 are connected by a pipe 11, and the pressurization / decompression unit 4 communicates with the air hose 12 via the emergency stop unit 9. The pressurizing gas supplied from the pressure-increasing / decreasing unit 9 is discharged from the tip of the air hose 12 through the piping 11 and the air hose 12 as the second flow path.

[0026] At the tip of the air hose 12 is provided a joint part 14 that can be attached to and detached from the joint part 1 3 provided on the container 100. Then, the joint part 14 at the tip of the air hose 12 is connected to the joint part 13 of the container 100 and the inside of the container 100 through the air tank 12 from the receiver tank 5 of the pressure adjusting unit 4. The inside of the container 100 can be pressurized by supplying a pressure gas to the container. Similarly, the joint part 14 at the tip of the air hose 1 2 is connected to the joint part 13 of the container 100, and the container 1 0 is connected via the air hose 12 by the vacuum pump 7 of the pressure adjusting unit 4. The inside of 0 can be depressurized (see Fig. 3).

[0027] The fork 3 includes a pair of channel members 17 provided on the bottom bottom surface of the container 100 and a fork 15 that can be attached to and detached from the channel 1 1 and a lifting mechanism 1 6 that lifts and lowers the fork 15 Have A load cell 1 5 3 is arranged on the surface of the fork 4 1. The load cell 15 3 measures the weight of the container 100 and converts it into an electric signal, which is input to the pressure switch 22 described later as needed.

FIG. 3 is a diagram showing a configuration of the pressure-increasing / decreasing unit 4. FIG. 6 is a graph showing the relationship between the flow rate of molten aluminum and the pressure value in the container 100 when molten aluminum is supplied to the outside of the container 100.

As shown in FIG. 3, the pressure increasing / decreasing unit 4 includes at least a traveling engine 1. While the transport vehicle 1 is traveling or idling according to 7, the generator 18 driven by the engine 1 and the air compressor 6 driven by the electric power generated by the generator 18 are provided. The air compressor 6 is driven by a battery when the transporting vehicle is operated by a battery and a motor. In this case, the air compressor can be driven independently of traveling and idling of the transporting vehicle.

The pressurizing gas compressed by the air compressor 6 is accumulated in the receiver tank 5. In other words, the gas once compressed from the air compressor 6 to the receiver tank 5 is accumulated while the transport vehicle 1 is traveling or idling. Therefore, the receiver tank 5 serves as a buffer between the air conditioner presser 6 and the container 100. Therefore, when the molten aluminum is supplied from the container 100 to the outside, the inside of the container 100 can be pressurized with a stable pressure. In addition, the receiver tank can be constantly charged with gas, and the supply of molten aluminum to the outside can be performed flexibly at any time and anywhere.

[0031] It is very important according to the knowledge of the present inventors to pressurize the container 100 in such a stable manner. This is because, when the pressure inside the container 100 is pressurized, if the pressure is unstable, the molten aluminum containing gas may be unexpectedly ejected from the tip of the pipe of the container 100.

[0032] Piping between the compressor 6 and the receiver tank 5

A first check valve 20, a line filter 8 a, an air dryer 8 b, and a second check valve 21 are provided in order from the 6th side. Both the first check valve 20 and the second check valve 21 are for preventing the backflow of gas from the receiver tank 5 side to the compressor 6 side. The first check valve 20 prevents the backflow of gas from the line filter 8a and the air dryer 8b side to the compressor 6 when the compressor 6 is stopped, for example, and is provided in the immediate vicinity of the line filter 8a. It is preferable that This allows compressor 6 and line filter 8 Piping between and a 1 9 It is possible to prevent dirt and clogging of a more effectively.

The line filter 8 a is a filter that removes water droplets and oil from the gas sent from the compressor 6 to the receiver tank 5. The air dryer 8 b is a filter that dries the gas sent from the compressor 6 to the receiver tank 5.

[0034] The second check valve 21 prevents the backflow of gas from the receiver tank 5 to the compressor 6. A pressure switch 22 is connected on the pipe 19b between the receiver tank 5 and the second check valve 21.

The pressure switch 2 2 as the first control means includes a pressure sensor 2 3 and C P U 2 4. The pressure sensor 23 detects the pressure in the receiver tank 5 and controls on / off of the compressor 6 based on the detection result. For example, the compressor 6 is turned on when the pressure of the receiver tank 5 becomes a predetermined value or less, and conversely, the power of the compressor 6 is turned off when the pressure of the receiver tank 5 becomes a predetermined value or more. Although details will be described later, the pressure value of the receiver tank 5 is calculated by C P U 2 4.

A pipe 19 c for opening to the atmosphere is connected to the pipe 19 a between the compressor 6 and the first check valve 20. One end of the pipe 19c is opened to the atmosphere via the leak valve 25. The leak valve 25 is controlled to be opened and closed by C P U 24 in the pressure switch 22.

[0037] In the CPU 24, the flow rate per hour of the molten aluminum based on the signal input from the load cell 15 3 when the molten aluminum in the container 100 is supplied to the outside of the container 100, That is, the first flow rate is calculated. In other words, the flow velocity is calculated from the change with time of the weight of the container 100. Here, the load cell 1 5 3 and the CPU 2 4 function as measurement means. If this first flow rate is not within a predetermined value range, for example, if not within 12 to 18 kg Z s, the pressurized gas flows into the container 100 so that the first flow rate is within this range. The pressure value is calculated by the CPU 24, and the information is input to the pressure sensor 23. The CPU 24 is connected to the compressor when the pressure in the receiver tank 5 drops below this predetermined value. Prior to turning on the sensor 6, the leak valve 5 in the closed state is opened. As a result, the inside of the pipe 19 a between the compressor 6 and the first check valve 20 returns to atmospheric pressure. Thereafter, the CPU 24 turns on the compressor 6 and closes the leak valve 25 that is open after a predetermined time has elapsed. Thus, once the inside of the pipe 19 a is returned to the atmospheric pressure, the compressor 6 can be started up with a smaller capacity, and the compressor 6 can be downsized.

As described above, in the present embodiment, the molten aluminum flowing out from the container 100 through the flow path 1 57 as the first flow path and the flow path 17 2 in the inner diameter portion of the pipe 14 4. The first flow velocity of the chamber is measured, and the pressure value of the pressurized gas flowing into the container 100 is controlled based on the measurement result. Thereby, the flow rate of the molten aluminum flowing out from the container 100 can be within a predetermined range, for example, in this embodiment, within 12 to 18 kg Z s, and the molten aluminum without quality deterioration can be obtained. Can be supplied. In this embodiment, as shown in FIG. 6, when the flow rate of the molten aluminum is 12 to 18 kg Z s, the inside of the container 100 is heated to about 30 to 35 kPa. What is necessary is just to make it a pressure state. Here, when the flow rate of molten aluminum is slow, the life of the pipe is long, but the work efficiency is poor. When the flow rate is fast, the work efficiency is good, but the life of the pipe is shortened. Further, when the first flow rate of the molten aluminum flowing out from the container 100 is high, the molten aluminum scatters on the surface of the molten aluminum in the holding furnace storing the molten aluminum supplied from the container 100, The quality of molten aluminum deteriorates due to the increase in oxide of molten aluminum. On the other hand, even when the first flow rate of the molten aluminum is slow, the molten aluminum scatters and the quality of the molten aluminum deteriorates. In the present embodiment, considering these circumstances, the first flow velocity is set to about 12 to 18 kg Z s, more preferably about 15 kg Z s. If the first flow rate is slower than 12 kg Z s, the life of the pipe will be long, but it will take time to supply molten aluminum, and the work efficiency will be poor, and the oxide of molten aluminum will increase and molten aluminum will increase. The quality of the product deteriorates. On the other hand, if the first flow rate is faster than 1 S kg Z s, Although the time required for supplying aluminum can be shortened and work efficiency is improved, the life of piping is shortened, and the quality of molten aluminum deteriorates due to an increase in oxide of molten aluminum. Therefore, by setting the flow rate to 12 to 18 kg Z s, it is possible to prevent the scattering at the time of supplying molten aluminum, to reduce oxides as much as possible, and to obtain molten aluminum with stable quality. Note that the first flow velocity value described above is such that the inner diameter of the flow path 15 7 of the container 100 to be described later that passes when the molten aluminum is supplied to the outside and the inner diameter of the subsequent pipe 14 4 is 65 to 85. It is a value suitable for the case of about mm.

[0039] The exhaust amount of the vacuum pump 7 is controlled by the control unit 80 as the second control means. As shown in FIG. 3, the supply of the molten aluminum into the container 100 is performed by attaching another pipe to the pipe 14 4 and connecting it to the storage tank 2 00 where the molten aluminum 2 0 1 is stored. In a state of being put, the inside of the container 100 is evacuated by the vacuum pump 7. In the control unit 80, the flow rate per hour of molten aluminum supplied into the container 100, based on the signal input from the load cell 15 53 when supplying the molten albumin into the container 100, That is, the second flow velocity is calculated. When the second flow rate is not within the predetermined flow rate range, for example, when the second flow rate is not within the range of 12 to 18 kg Z s, the vacuum pump 7 that evacuates the container 100 so as to be within the flow rate range. The exhaust pump is calculated, and the vacuum pump 7 is controlled by the controller 80 so that it is within the calculated value.

[0040] Thus, in the present embodiment, the flow path as the first flow path to the container 100

1 5 7 and piping 1 4 4 Measure the second flow velocity of molten aluminum supplied via the flow path 1 7 2 and exhaust the container 100 based on the measurement result. The exhaust volume of the vacuum pump 7 is controlled. Thus, the second flow rate of the molten aluminum supplied to the container 100 can be within a predetermined range, for example, in this embodiment, within 12 to 18 kg Z s. It is possible to improve the work efficiency while slowing down the deterioration rate. That is, if the second flow rate of molten aluminum is slow, the life of the pipe is long, but the work efficiency is poor, and if the second flow speed is fast, the work efficiency is good, but the life of the pipe is shortened. of In this way, the second flow rate of the molten aluminum supplied to the vessel 100 is set within a predetermined range, for example, 12 to 18 kg Z s, thereby improving the work efficiency while slowing the deterioration rate of the pipe. be able to. The second flow velocity value is determined when the inner diameter of the flow path 15 7 and the subsequent piping 14 4 4 through which molten aluminum described below is supplied to the outside is about 65 mm to 85 mm. It is a suitable numerical value.

[0041] In this embodiment, the pipe diameter upstream of the receiver tank 5 is, for example, about 2 Z 3 smaller than the pipe downstream of the receiver tank 5 (the side closer to the container 100). . This is because a large amount of gas is pumped from the receiver tank 5 to the container 100 once, whereas gas is gradually sent from the compressor 6 to the receiver tank 5.

In the present embodiment, the line filter 8 a and the air dryer 9 b are provided not on the downstream side of the receiver tank 5 but on the upstream side of the receiver tank 5, that is, on the pipe 19 between the receiver tank 5 and the compressor 6. In other words, these line filters 8a and air dryers 8b can be reduced in size by providing a smaller gas flow rate per unit time on the narrow side of the pipe.

[0043] The receiver tank 5 is connected to a pressurized gas pipe 26, and this pressurized gas pipe

26 is connected to a switching valve 27 comprising a three-way valve, for example. Similarly, the vacuum pump 7 is connected to the vacuum pipe 2 8, and the vacuum pipe 2 8 is connected to the switching valve 2 7. The switching valve 27 is configured to switch the connection between the air hose 12 and the pressurized gas pipe 26 and the connection between the air hose 12 and the vacuum pipe 28. This switching valve 27 is connected to one end of the air hose 12 via a pressure gauge 29, a relief valve 30, a leak valve 31, an emergency stop 9 and a filter.

A control valve 3 2 and a leak valve 3 3 are connected to the pressurized gas pipe 26 from the receiver tank 5 side (upstream side). A control valve 3 4 and a leak valve 3 5 are connected to the vacuum pipe 28 from the vacuum pump 7 side (downstream side). [0045] Each control valve 3 2, 3 4 adjusts the pressure in the pressurized gas pipe 26 and the vacuum pipe 28, respectively, and also connects and shuts off (on Z off) of each pipe. To do.

[0046] Filter 5 1 operates by clogging oil, aluminum powder, dust from aluminum pieces, etc. from the container 100 side into the valves and emergency stop 9 on the transport vehicle side. This is to prevent it from being lost. Although it is conceivable to provide such a filter 51 on the container 100 side, it is necessary to provide a filter for each container 100. In the present invention, the number of necessary filters can be reduced by providing such a filter 51 on the transport vehicle 1 side.

According to the knowledge of the present inventors, the amount of dust and the like from the container side to the receiver 5 side is much larger than the amount of dust and the like from the receiver tank 5 side to the container side. . In the present embodiment, by providing such a filter 51 on the downstream side of the valves and the emergency stop portion 9 in particular, the relief valve 30 and others due to dust or the like sent from the container 100 side. It is possible to prevent clogging of the valve. However, the filter 51 may of course be arranged upstream of this, or may be provided at a plurality of locations. For example, the filter 51 may be provided between the switching valve 27 and the relief valve 30, and the filter 31 may be provided between the switching valve 27 and the leak valve 33.

[0048] These pressure control valves and valve systems are electronically controlled by an electric control panel (not shown). By operating a hand control panel (not shown), The pressure difference with the outside can be adjusted.

[0049] The emergency stop section 9 can be used when the pressurization to the container is to be stopped in an emergency such as when the molten aluminum receiving side is likely to overflow.

[0050] Next, the container 100 will be described.

FIG. 4 is a plan view showing a configuration of a molten metal supply container used in such a system, and FIG. 5 is a cross-sectional view taken along line AA in FIG. In the molten metal supply container 100, a large lid 15 52 is disposed in the upper opening 15 1 of the bottomed and cylindrical main body 15 50. Flange 1 5 3 and 1 5 4 are provided on the outer peripheries of main body 1 5 0 and large lid 1 5 2, respectively. The main body 1 5 0 and the large lid 1 5 2 are fixed by tightening these flanges with Pol 卜 1 5 5. Note that the main body 1 5 0 has a large lid 1 5 2 whose outer side (frame) is metal (for example, iron). The inside of the frame is made of refractory material, and a heat insulating material is inserted between the outer metal and the refractory material.

[0053] At one location on the outer periphery of the main body 15O, there is provided a pipe attachment portion 58 provided with a flow path 1557 that communicates from the inside of the main body 150 to the pipe 144.

[0054] The flow path 1 5 7 in the pipe attachment portion 1 5 8 is connected to the main body 1 5 0 via the opening 1 5 7 a provided at a position close to the bottom 1 5 0 a of the container main body. 1 5 0 It extends toward the upper part of the outer circumference 1 5 7 b. The pipe 1 4 4 is fixed so as to communicate with the flow path 1 5 7 of the pipe mounting portion 1 5 8. The pipe 1 4 4 has, for example, a “letter shape. The frame of the pipe 1 4 4 is made of a metal such as iron, for example, and a lining is formed as a lining inside the pipe. The inner side of the lining is formed as a molten metal flow path 17 2. As the refractory material, for example, a dense refractory ceramic material can be used.

[0055] A heat insulating member 1556a is disposed around the pipe 14-4 near the pipe attachment portion 1558 so as to surround the pipe 144. As a result, it is possible to suppress as much as possible that the pipe 1 4 4 side takes heat from the flow path 1 5 7 side and a temperature drop of the flow path 1 5 7 occurs. In particular, around the pipe 1 4 4 in the vicinity of the pipe mounting part 1 5 8, the molten metal is easy to cool, and the liquid level just shakes when the container is transported. Therefore, the molten metal at this position can be prevented from solidifying by surrounding the pipe 1 4 4 in the vicinity of the pipe mounting portion 1 5 8 with the heat insulating member 1 5 6 a in this way.

[0056] The effective inner diameters of the flow path 1 5 7 and the subsequent pipe 1 4 4 are substantially equal, and preferably about 65 mm to 85 mm. Traditionally, this type of pipe has an inner diameter of about 50 mm. there were. This is because if it is more than that, it is considered that a large pressure is required when the inside of the container is pressurized and the molten metal is led out from the pipe. In contrast, the present inventors preferably set the inner diameter of the flow path 1 57 and the subsequent pipe 1 44 to be about 65 mm to 85 mm, more preferably about 70 mm to 8 Omm. Preferably, the flow path 157 was found to be 70 mm and the inner diameter of the pipe 1 44 was 8 Omm.

[0057] That is, when the molten metal flows upward in the flow path 157 and the pipe 144, the weight of the molten metal itself present in the flow path 157 and the pipe 144 and the viscosity of the inner wall of the flow path and the pipe The two parameters of resistance are considered to have a great influence on the resistance that hinders the flow of molten metal. Here, when the inner diameter is smaller than 65 mm, the molten metal flowing through the flow path 157 is affected by both the weight of the molten metal itself and the viscous resistance of the inner wall at any position. However, the inventors have found that when the inner diameter is 65 mm or more, an area that is hardly affected by the viscous resistance of the inner wall starts to appear from around the center of the flow, and the area gradually increases. The effect of this region is very large, and the resistance that hinders the flow of molten metal begins to decrease. When the molten metal is withdrawn from the container, it is only necessary to pressurize the container with a very small pressure. In other words, in the past, the influence of such a region was not taken into consideration at all, and only the weight of the molten metal itself was considered as a resistance fluctuation factor that hinders the flow of the molten metal, for reasons such as workability and maintainability. The inner diameter was about 5 Omm. On the other hand, when the inner diameter exceeds about 85 mm, the weight of the molten metal itself becomes very dominant as a resistance that hinders the flow of the molten metal, and the pressure required to supply the molten metal becomes high. According to the results of the implementation by the present inventors, an inner diameter of about 65 mm to about 8 Omm only needs to be pressurized with a very small pressure, and is most preferable from the viewpoint of standardization and workability. In other words, the pipe diameter is standardized in units of 5 mm, 60 mm, 70 mm, and 10 mm. The smaller the pipe diameter, the easier the handling and the better the workability.

[0058] An opening 160 is provided at substantially the center of the large lid 152, and a hatch 162 to which a handle 16 1 is attached is disposed in the opening 160. hatch 1 6 2 is provided at a position slightly higher than the upper surface of the large lid 1 5 2. The hatch 1 6 2 is attached to the large lid 1 5 2 via a hinge 1 6 3 at one place on the outer periphery. As a result, the hatch 16 2 can be opened and closed with respect to the opening 60 of the large lid 15 2. In addition, the port 1 with a handle for fixing the hatch 1 6 2 to the large lid 1 5 2 is located at two places on the outer periphery of the hatch 1 6 2 so as to face the position where the hinge 1 6 3 is attached. 6 4 is installed. By closing the opening 1 6 0 of the large lid 1 5 2 with the hatch 1 6 2 and turning the port 1 6 4 with the handle, the hatch 1 6 2 is fixed to the large lid 1 5 2. In addition, the hatch 16 2 can be opened from the opening 1 6 0 of the large lid 1 5 2 by reversely rotating the port 16 4 with the handle to release the fastening. In the state where the hatch 16 2 is opened, the gas burner is inserted into the container 100 during the pre-heating through the opening 160.

[0059] First to third through holes 1 65 a to 1 65 c that penetrate the inside and outside of the container 100 are provided at positions away from the center of the hatch 16 2 by a predetermined distance. Yes. The first through hole 1 6 5 a is provided on the pipe 1 4 4 side, and the second through hole 1 6 5 b and the third through hole 1 6 5 c are connected to the first through hole 1 6 5 a and Is on the opposite side. Thus, the distance between the first through-hole 1 65 a and the second through-hole 1 65 b and the third through-hole 1 65 5 c is the same as that between the second through-hole 1 65 b and the third through-hole 1 65 b. The distance from the through hole 1 6 5 c is longer than the distance.

[0060] Screw holes are cut in each of the through holes 1 6 5 a to 1 6 5 c. Plugs 1 6 8 a and 1 6 8 b constituting one of the force bras are attached to the first and second through holes 1 6 5 a and 1 6 5 b. A first socket 1 70 0 a through which the first electrode rod 1 6 9 a is passed is attached to the first through hole 1 65 5 a. A second socket 1 700 b through which the second electrode rod 1 69 9 b is passed is attached to the second through hole 1 65 b. Each plug and socket make up a power bra.

[0061] The third through hole 1 6 5 c is used for internal pressure adjustment for performing pressure reduction and pressurization in the container 100. This third through hole 1 6 5 c is adjusted as shown in Fig. 3. Pipe 6 6 for pressure is connected. The pipe 66 extends upward from the third through hole 1 65 c, bends at a predetermined height, and extends horizontally therefrom. A thread is formed on the surface of the pipe 66 inserted into the through hole 1 65 c, and a thread is also formed on the through hole 1 65 c. As a result, the pipe 66 is fixed to the through hole 1 65 c by screwing.

[0062] A flexible air hose 12 for pressurization or decompression can be connected to one of the pipes 66 by a force bra structure. Then, it is possible to flow molten aluminum into the container 100 through the pipe 14 4 and the flow path 15 7 by utilizing the pressure difference due to the reduced pressure. Further, the molten aluminum can be discharged out of the container 100 through the flow path 1 5 7 and the pipe 1 4 4 using the pressure difference by pressurization.

[0063] In the present embodiment, a through-hole 1665c for increasing / decreasing pressure is provided in the hatch 162, which is disposed at substantially the center of the large lid 1552. On the other hand, since the pipe 66 extends in the horizontal direction, the work of connecting the air hose 12 for pressurization or decompression to the pipe 66 can be performed safely and easily. Further, by extending the pipe 6 6 in this way, the pipe 6 6 can be rotated with a small force with respect to the through hole 1 65. Therefore, it is possible to fix and remove the pipe 66 screwed to the through hole 1 65 c with a very small force without using a tool, for example.

[0064] On the bottom surface of the bottom of the main body 1 50, for example, a channel member 1 71 as a leg portion having a predetermined length in a cross-sectional mouth shape into which a fork of a fork riff is inserted, for example, 2 is parallel. The book is arranged.

[0065] The bottom 1 5 0a inside the main body 1 5 0 is entirely inclined so that the channel 1 5 7 side is lowered. This reduces the amount of so-called hot water when the molten aluminum is led out to the outside through the flow path 15 7 and the pipe 14 4 due to pressurization. In addition, for example, when the molten aluminum is led out to the outside through the flow path 1 5 7 and the pipe 1 4 4 by tilting the container 100 during maintenance, the angle at which the container 100 is tilted can be made smaller, and the safety And workability is excellent. However, Such inclination may be reversed. As a result, clogging of the opening 1 5 7 a can be prevented.

FIG. 7 is a diagram showing an overall configuration of a metal supply system according to the present invention.

[0067] As shown in the figure, the first factory 3 1 0 and the second factory 3 2 0 are, for example, public roads

It is provided at a distance via 3 3 0.

[0068] The first factory 3 1 0 has a die-cast machine 3 as a point of use.

1 There are multiple 1s. Each die-casting machine 3 1 1 uses a melted aluminum as a raw material and molds a product of a desired shape by injection molding. Examples of such products include parts related to automobile engines. Of course, the molten metal is not limited to an aluminum alloy but may be an alloy mainly composed of other metals such as magnesium and titanium. Near each die-casting machine 3 1 1, there is a holding furnace (hand holding furnace) 3 1 2 that temporarily stores molten aluminum before the shot. In this holding furnace 3 1 2, molten aluminum for multiple shots is stored, and for each shot, a ladle 3 1 3 or a pipe is connected to the die casting machine 3 1 from the holding furnace 3 1 2. 1 is filled with molten aluminum. Each holding furnace 3 1 2 has a liquid level detection sensor (not shown) for detecting the level of molten aluminum stored in the container and a temperature sensor for detecting the temperature of molten aluminum. (Not shown) is arranged. The detection results by these sensors are transmitted to the control panel of each die-cast machine 3 1 1 or the central control unit 3 1 6 of the first factory 3 1 0.

[0069] The container 10 0 0 received in the receiving section of the first factory 3 1 0 is delivered to a predetermined die cast machine 3 1 1 by the forklift 50 0 according to the present invention, and the holding furnace is started from the container 1 0 0 3 1 2 is supplied with molten aluminum. The container 100 which has been supplied is returned to the receiving part by the forklift 1 again.

[0070] In the first factory 3 1 0, the aluminum is melted and supplied to the container 1 0 0 The first furnace 3 1 9 is provided, and the container 1 0 0 supplied with the molten aluminum by the first furnace 3 1 9 is also delivered by the forklift 1 to the predetermined die machine 3 1 1. It has become so.

[0071] The first factory 3 1 0 is provided with a display unit 3 15 for displaying when it is necessary to add molten aluminum in each die-cast machine 3 1 1. More specifically, for example, a unique number is assigned to each die-cast machine 3 1 1, and the number is displayed on the display unit 3 1 5, and a die that requires the addition of molten aluminum is required. The number in the display section 3 1 5 corresponding to the number of the cast machine 3 1 1 lights up. Based on the display on the display unit 3 15, the worker uses the fork riff 1 to carry the container 100 to the die cast machine 3 1 1 corresponding to the number and supplies molten aluminum. The display on the display unit 3 15 is performed by the central control unit 3 16 controlling based on the detection result by the liquid level detection sensor.

[0072] The second factory 3 20 is provided with a second furnace 3 2 1 for melting aluminum and supplying it to the container 100. There are several types of containers 100 0 with different capacities, pipe lengths, heights and widths. For example, there are a plurality of types having different capacities depending on the capacity of the holding furnace 3 1 2 of the die casting machine 3 11 in the first factory 3 10. The container 100 to which molten aluminum is supplied by the second furnace 3 2 1 is placed on a transport truck 3 3 2 by a forklift. Truck 3 3 2 carries container 1 0 0 through the public road 3 3 0 to the receiving part of the first factory 3 1 0. The empty container 100 in the receiving section is returned to the second factory 3 2 0 by the track 3 3 2.

[0073] The second factory 3 2 0 has a display section 3 2 2 for displaying when it is necessary to add molten aluminum to each die-cast machine 3 1 1 in the first factory 3 1 0. Is arranged. The configuration of the display unit 3 2 2 is almost the same as that of the display unit 3 1 5 arranged in the first factory 3 1. The display on the display unit 3 2 2 is performed by the central control unit 3 16 in the first factory 3 1 0 via the communication line 3 3 3, for example. In the second factory 3 2 0 In the display unit 3 2 2, it is determined that the molten aluminum is supplied from the first furnace 3 1 9 in the first factory 3 1 0 among the die casting machines 3 1 1 requiring supply of molten aluminum. The cast machine 3 1 1 is displayed separately from the other die cast machines 3 1 1. For example, the number corresponding to the die-cast machine 3 1 1 determined in this way flashes. As a result, the molten aluminum is accidentally supplied from the second factory 3 2 0 side to the die cast machine 3 1 1 determined to be supplied with molten aluminum from the first furnace 3 19. You can eliminate things like this. In addition to the above, the display unit 3 2 2 also displays data transmitted from the central control unit 3 16.

Next, the operation of the metal supply system configured as described above will be described.

The central control unit 3 16 monitors the amount of molten aluminum in each holding furnace 3 1 2 via a liquid level detection sensor provided in each holding furnace 3 1 2. Here, when there is a need to supply molten aluminum in a certain holding furnace 3 1 2, the central control unit 3 1 6, the “unique number” of the holding furnace 3 1 2, the holding furnace 3 1 2 `` Temperature data '' of the holding furnace 3 1 2 detected by the temperature sensor provided in 2, `` Configuration data '' regarding the form of the holding furnace 3 1 2, and finally the molten aluminum disappears from the holding furnace 3 1 2 Such as “time data”, “traffic data” on public roads 3 3 0, “quantity data” and “temperature data” of molten aluminum required in its holding furnace 3 1 2, communication line 3 3 3 Via the second factory 3 2 0 side. In the second factory 3 2 0, these data are displayed on the display 3 2 2. Based on the displayed data, the operator empirically reaches the holding furnace 3 12 immediately before the molten aluminum is exhausted from the holding furnace 3 1 2, and the molten aluminum at that time has a desired temperature. The shipping time of the container 100 from the second factory 320 and the temperature at the time of shipping the molten aluminum are determined so that Alternatively, these data are taken into a personal computer (not shown), for example, and the container 10 0 0 arrives at the holding furnace 3 1 2 immediately before the molten aluminum disappears from the holding furnace 3 1 2 using predetermined software. And the molten aluminum at that time Estimate the shipping time of the container 100 from the second factory 3 20 and the temperature when the molten aluminum is shipped so that the temperature reaches the desired temperature, and display the time and temperature. Also good. Alternatively, the temperature of the second furnace 3 2 1 may be automatically controlled based on the estimated temperature. The amount of molten aluminum to be accommodated in the container 100 may also be determined based on the above “quantity data”.

[0076] When truck 3 3 2 with container 1 0 0 departs at the time of shipment and arrives at first factory 3 1 0 through public road 3 3 0, container 1 0 0 receives from truck 3 3 2 Accepted by clubs.

[0077] Thereafter, the received container 100 is delivered to the predetermined die casting machine 3 11 by the forklift 1, and molten aluminum is supplied from the container 100 to the holding furnace 31 2.

In the above embodiment, the forklift 1 is configured to supply molten aluminum to the holding furnace 3 12 while holding the container 100. As a result, the forklift 1 and the container 100 could operate as a stand-alone type without receiving supply of air or the like in the factory. However, the present invention is not limited to such a form. For example, as shown in FIG. 8, a holding table 4 00 holding a container 100 is arranged near the holding furnace 3 12, and The container 100 is temporarily transferred from the forklift 1 to the holding table 400, and in that state, molten aluminum is supplied from the container 100 to the holding furnace 31 2. Then, when the container 100 held on the holding table 400 is completely supplied to the holding furnace 3 1 2, the forklift 1 receives the container 100 from the holding table 400 and receives another container You may comprise so that it may carry.

In the system shown in FIG. 8, the holding furnace 3 1 2 is provided with an open / close lid 4 0 1. Molten aluminum is supplied from the container 100 to the holding furnace 3 1 2 with the lid 4 101 opened. Keep lid 4 0 1 closed when not supplied. Thereby, it is possible to prevent the molten aluminum in the holding furnace 3 1 2 from being oxidized.

[0080] A monitoring operation unit 4 0 2 is provided near the holding furnace 3 1 2. This monitoring The operator 4 0 3 works in the operation unit 4 0 2. The floor is a little higher so that the operator 40 3 can see the inside from the upper part of the holding furnace 3 1 2 with the operator 40 3 standing in the monitoring operation unit 40 2. Therefore, the operator 40 3 goes up to the monitoring operation unit 4 0 2 through the stairs 4 0 4. The monitoring operation section 4 0 2 is provided with a local operation box 4 0 5. In the local operation box 4 0 5, the air supply to the container 1 0 0 can be turned on and off. Of course, a liquid level detection sensor may be provided in the holding furnace 312, and the air supply to the container 100 may be turned on / off according to the upper limit U and the lower limit L of the liquid level.

[0081] On the holding table 400, a weigh scale 400 is arranged. The weigh scale 400 measures the weight of the container 100 held on the holding table 400. Based on the result measured by the weigh scale 4 0 6, for example, the amount of molten aluminum supplied to the holding furnace 3 1 2 is controlled. For example, the container 1 0 0 is detected by detecting that the holding furnace 3 1 2 is full. Stop the air supply to. Also, based on the result measured by the weigh scale 4 06, the empty state of the container 100 is detected. An empty notification is performed.

[0082] Factory-side air 40 07 is supplied to the container 100 held on the holding table 400. For example, air 40 7 is supplied through pressure gauges 40 08, 40 09, air release valve 4 10, pressure control valve 4 1 1, air release valve 4 1 2, and foreign matter removal filter 4 1 3. Supplied to container 1 0 0. Of course, such a system may be provided with the gas supply control mechanism according to the present invention already described.

[0083] The present invention is not limited to the above-described embodiment, and can be implemented with various modifications. The scope of implementation is also within the scope of the present invention.

Brief Description of Drawings

FIG. 1 is a front view showing a configuration of a transport vehicle according to an embodiment of the present invention.

FIG. 2 is a plan view of the transport vehicle shown in FIG.

FIG. 3 is a diagram showing a configuration of a pressure-intensifying unit according to an embodiment of the present invention.

FIG. 4 is a plan view of a container according to an embodiment of the present invention. FIG. 5 is a cross-sectional view taken along line A_A of the container shown in FIG.

FIG. 6 is a graph showing the relationship between the flow rate of molten aluminum and the pressure value in container 100 when molten aluminum is supplied out of container 100 according to an embodiment of the present invention.

FIG. 8 is a diagram showing a configuration of a molten metal supply system according to another embodiment of the present invention.

Explanation of symbols

1 Vehicle

7 Vacuum pump

1 1 Piping

1 2 Air hose

2 2 Pressure switch

2 4 C P U

8 0 Control unit

1 0 0 Container

1 4 4 Piping

1 5 3 Load cell

1 5 7, 1 7 2 Flow path

Claims

The scope of the claims

[1] A container structured to be transported from a first factory to a second factory via a public road, capable of storing molten metal, and a gas between the outside of the container and the inside of the container A sealed container body provided from the body passage and the inner bottom portion toward the pipe mounting portion on the upper surface portion, and having a flow path for deriving molten metal from the inner portion to the outside by pressurization; A pipe that communicates with the flow path, extends upward from the pipe mounting portion, bends in a substantially horizontal direction at a predetermined position, faces downward at a predetermined position, and has a discharge port at a tip portion facing downward. In a gas supply device that supplies at least pressurized gas to

An air hose connectable to the gas passage;

A pressurized gas supply unit for supplying pressurized gas to the container through the air hose and the gas passage;

Measurement to measure the flow rate of molten metal supplied from the inside of the container to the outside of the container through the flow path and the piping by flowing a pressurized gas into the container through the air hose. And

A control unit for controlling the pressure value of the pressurized gas supplied to the container so that the flow velocity measured by the measurement unit becomes a predetermined value;

A gas supply device comprising:

[2] The gas supply device according to claim 1,

An internal diameter of the flow path and the pipe has a diameter of 65 to 85 mm.

[3] The gas supply device according to claim 2,

The gas supply device according to claim 1, wherein the predetermined value is 12 to 18 kg Zs.

[4] The gas supply device according to claim 1,

A vacuum pump for depressurizing the inside of the container through the air hose, and the measuring unit exhausts the inside of the container by the vacuum pump, Measure the flow rate of the molten metal supplied into the container, The control unit controls an exhaust amount of the vacuum pump so that a flow rate measured by the measuring unit becomes a predetermined value.

The gas supply apparatus characterized by the above-mentioned.

[5] The gas supply device according to claim 1,

The gas supply apparatus is mounted on a fork riff for transporting the container.

[6] A container structured to be transported from the first factory to the second factory via a public road, capable of storing molten metal, and having a gas between the outside of the container and the inside of the container. A sealed container body provided from the body passage and the inner bottom portion toward the pipe mounting portion on the upper surface portion, and having a flow path for deriving molten metal from the inner portion to the outside by pressurization; and A pipe that communicates with the flow path, extends upward from the pipe mounting portion, bends in a substantially horizontal direction at a predetermined position, faces downward at a predetermined position, and has a discharge port at a tip portion facing downward. In a gas supply method for supplying at least pressurized gas to

Supplying pressurized gas to the container through the air hose connectable to the gas passage and the gas passage;

Measuring the flow rate of the molten metal supplied from the inside of the container to the outside of the container through the flow path and the piping by flowing pressurized gas into the container through the air hose;

The pressure value of the pressurized gas supplied to the container is controlled so that the measured flow velocity becomes a predetermined value.

The gas supply method characterized by the above-mentioned.

[7] The gas supply method according to claim 6,

The gas supply method according to claim 1, wherein an inner diameter of the flow path and the pipe has a diameter of 65 to 85 mm.

[8] The gas supply method according to claim 7,

The gas supply method according to claim 1, wherein the predetermined value is 12 to 18 kg Zs.

[9] The gas supply method according to claim 6, The inside of the container is depressurized via the air hose,

Measuring the flow rate of the molten metal supplied into the container through the pipe and the flow path by depressurizing the inside of the container,

The gas supply method, wherein the degree of decompression is controlled so that the measured flow rate becomes a predetermined value.