JPH0327860A - Automatic pouring device - Google Patents

Abstract

PURPOSE:To assure the safety of automatic pouring by providing 1st and 2nd valve parts facing opening/closing rod in the pouring device to the injection sleeve of a die casting machine. CONSTITUTION:A 1st valve and seat 21a and 2nd valve seat 20a of respectively small diameters are provided to face the inside surface near the front end and in the upper part of the injection sleeve 22 to constitute a valve part. The outflow is surely prevented by the 2nd valve part to prevent the high-temp. excess molten metal to flow over to the outside of the injection sleeve 22 when the opening/closing rod is broken or the valve part of the sleeve side is chipped. The safety and workability are thus assured.

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to an automatic water supply device that supplies molten metal into the injection sleeve of a die-casting machine. [Prior Art] Die casting machines are classified into vertical clamping dies and horizontal clamping dies according to the mold clamping direction, and also into vertical casting dies and horizontal casting dies according to the casting direction. Among these, the horizontal compaction die-casting machine was proposed by the present applicant, and
The system disclosed in Publication No. 55859 is known, and is roughly structured as follows. In other words, a movable platen is supported on the tie rods at the four corners that connect a pair of fixed plates set up opposite each other on the machine base so as to be able to move forward and backward with respect to one of the fixed plates, and this movable platen A movable mold and a fixed mold are respectively attached to one fixed plate. A cavity is formed at the joint between the movable mold and the fixed mold, which are moved together with the movable plate and clamped by a mold clamping cylinder on the other fixed plate side, and the fixed mold has a fixed mold that communicates with the cavity. The sleeve is fitted with a downward opening. An injection device is supported below the fixed mold so that it can be tilted upright, and this injection device includes an injection cylinder fixed to an injection frame,
It is equipped with a plunger that is connected to the piston rod and has a plunger tip at the tip fitted into the inner hole of an injection sleeve that can move up and down on the injection frame side. With this structure, after the mold is clamped, the entire injection device is tilted to supply molten metal into the injection sleeve by the hot water supply device, the injection device is stood upright, and the injection sleeve is joined to the fixed sleeve. When the plunger tip of the injection cylinder is raised, the molten metal is injected into the cavity through the fixed sleeve, and as the molten metal solidifies, a cast product is obtained. In addition, although this device exemplifies one in which the entire injection device is tilted to supply hot water, a device has also been developed in which, unlike this, the entire injection device is moved horizontally and then hot water is supplied to the injection sleeve. Furthermore, although this device is of a horizontal clamping type and a horizontal casting type, the structure of the injection device is almost the same for vertical clamping and vertical casting type die casting machines. In such die casting machines, the hot water supply device that supplies molten metal to the injection sleeve has conventionally been equipped with a melting furnace that stores molten metal and a ladle that pumps out and pours the molten metal. The molten metal that has been melted in another melting furnace or transferred to the melting furnace and stored is
It is pumped out by the ladle and fed into the injection sleeve by the ladle moved above the injection sleeve. Additionally, an automatic water heater has been developed that uses a motor to perform everything from pumping out the molten metal to moving the ladle and pouring the metal. However, in such conventional hot water supply equipment, the molten metal is exposed to the atmosphere during hot water supply, so the surface of the molten metal is easily oxidized, resulting in a problem that the quality of the cast product deteriorates. Therefore, the present applicant proposed the
As disclosed in the publication, molten metal is poured into a sealed container-shaped ladle with an opening/closing rod in the center that opens and closes with a cylinder, and the ladle is moved horizontally and vertically by a motor to supply hot water. An automatic hot water supply system has been proposed. [Problems to be Solved by the Invention] However, in systems that supply hot water using a closed ladle, once the desired amount of molten metal is pumped into the ladle, the valve stem is simply lowered by the action of the cylinder to close the molten metal inlet. Because there is
In the unlikely event that the valve stem breaks or part of the molten metal inlet breaks during hot water supply, due to its structure, it will not be possible to prevent the molten metal from flowing out from the ladle, creating a dangerous problem. be. [Means for Solving the Problems] In order to solve these problems, the present invention provides a first valve seat with a small diameter on the inner surface near the tip of the cylindrical sleeve,
A second valve seat with a large diameter is provided on the inner surface of the upper part of the sleeve, and a first valve part that can be opened and closed with respect to the first valve seat is provided at the tip of an opening/closing rod having a different diameter. A second valve part that can face the second valve seat is provided on the outer periphery of the stepped part, and when the first valve seat is closed at the forward limit of the opening/closing rod, the second valve part is connected to the second valve seat. The structure is such that it is open to the seat.

[Effect]

Molten metal is stored in a melting furnace or heat retention furnace, and when the opening/closing rod is inserted into the injection sleeve moved below the tip of the furnace and opened, the molten metal in the furnace flows into the injection sleeve. However, it may break when the opening/closing rod is pressed too hard, or
If the valve seat on the sleeve side that comes into contact with the tip of the opening/closing rod is chipped, in order to prevent more molten metal from being supplied to the injection sleeve than necessary, the opening/closing rod is moved further forward by the action of the cylinder and the second Close the valve. In addition, it is better to then supply compressed air to the piston rod side of the air cylinder installed at the rear end of the furnace and move the molten metal back from the hot water supply chamber to the insulating chamber by lowering the rear end of the furnace. ．． In this way, the opening/closing rod and sleeve can be easily maintained. [Example] Figures 1 to 4 show examples of the automatic hot water supply device according to the present invention, Figure 1 is a longitudinal sectional view of one example, and Figure 2 shows the vicinity of the valve stem and its insertion. FIG. 3 is an enlarged longitudinal sectional view showing another embodiment near the valve stem; FIG. 4 is a longitudinal sectional view of the injection sleeve;
The figure is a partially cutaway schematic side view of the entire unit shown to explain the operation. In the figure, the entire furnace 2 of the automatic hot water supply system N1 is shaped like a C-shaped box, and the heater 3 is housed inside the double-walled outer wall. Inside the furnace 2, a heating chamber 5 and a hot water supply chamber 6 are separated by a partition wall 4, and a filter 7 is provided in the center or lower part of the partition wall 4 to communicate the two chambers 5, 6. Inside the greenhouse 5, there is a heater 3.
The heated molten metal 8 is stored in the hot water supply chamber 6, and the molten metal 8, from which hard spots and oxides have been removed by passing through the filter 7, is kept on the same surface as the preservation chamber 5. It is stored as nothing. The mesh size of the filter 7 is set so as to slow down the passage of the molten metal 8, and since 1 injection shot usually takes 20 seconds or more, the amount of molten metal 8 passing through is set to, for example, 1kg/720 seconds. 9 is a pouring spout opened at the upper end of the furnace 2. It should be noted that pipes for an inert gas such as N2 gas (not shown) are installed in the hot water heating chamber 5 and the hot water heating chamber 6 separately, or at least in the hot water heating chamber 6, so that the upper part of the molten metal 8 in the hot water heating chamber 5 and the hot water heating chamber 6 are connected to each other. It is also possible to create a structure in which the space is constantly replaced with air to create a N2 gas atmosphere to prevent the generation of oxides on the surface of the molten metal 8 as much as possible. The furnace 2 thus formed is mounted on a stand l as shown in FIG.
It is tiltably supported by O and an air cylinder 1l.
That is, bearings 12 are integrally formed at the rear end of the stand 10 on both left and right sides, which are the front side of the figure and the back side of the paper, and a shaft l3 is rotatably mounted on these left and right bearings 12. A pair of left and right support arms l4 are fixed to this shaft l3. The front end of the furnace 2 is connected to the support arm 1.
The left and right ends of the air cylinder 11 are rotatably attached to the free ends of the furnace 4 with bins 15, and the air cylinder 11 is pivotally attached to the center of the lower end of the furnace 2 in the longitudinal direction and the width direction. The working end of the piston rod l6 is pivotally connected. By doing this, when the piston rod l6 of the air cylinder 11 is advanced in the upward direction from the illustrated position, the furnace 2 rotates around the pin l5 while keeping the support arm 14 stationary, as shown by the chain line 2A in the figure. As shown, the front end is configured to tilt in the downward direction. Also, air cylinder 1l
When the piston rod l6 of
3, and the rear end is configured to tilt in a downward direction, as shown by chain line 2B in the figure. This series of raising and lowering of the rear end of the furnace 2 about the axis l3 is performed by supplying compressed air to the piston head side or the piston rod side of the air cylinder 11, which is a lifting means. However, when supplying the molten metal 8 to the injection sleeve 22,
If the opening/closing rod l9 is broken or the valve seat 21a on the sleeve 2l side that contacts the tip of the opening/closing rod l9 is chipped, the molten metal 8 may overflow from the injection sleeve 22. When it comes into contact with the detection rod 24, an alarm is generated and compressed air is increased to the piston head side of the air cylinder l7, and the second valve part of the opening/closing rod l9 and the valve seat of the closing ring 20 are brought into contact and the molten metal is removed. Prevent the leakage of 8. After that, a sequence is set up to simultaneously supply compressed air to the piston rod side of the air cylinder 11 and extract air from the piston head side. The structure is such that the molten metal 8 is backed up from 6 to the insulating chamber 5 to prevent the molten metal 8 from overflowing from the injection sleeve 22. In addition,
When the furnace 2 tilts from the solid line position to the chain line 2A position, the molten metal 8
The surface of the molten metal 8 becomes flush with the lower end of the filter 7, as shown by reference numeral 8A in the figure, and when the furnace 2 is tilted from the solid line position to the chain line 2B position, the molten metal 8 surface becomes flush with the lower end of the filter 7, as shown by reference numeral 8B in the figure. The surface is flush with the lower end of the filter 7, so that no molten metal 8 remains in the hot water supply chamber 6. An air cylinder l7 is fixed to the upper surface of the front end of the furnace 2, and its piston rod 18 is suspended in the hot water supply chamber 6, and an opening/closing rod l9 made of, for example, ceramic is attached to the working end of the air cylinder l7. are connected concentrically. On the other hand, in the hole drilled at the lower end of the hot water supply chamber 6,
A closing ring 20 and a sleeve 2l are fitted, and the sleeve 21 is provided with a valve seat 21a that is opened and closed at its tip valve portion as the opening/closing rod l9 moves forward and backward. Further, the closing ring 20 is provided with a valve seat 20a which is closed by the upper end valve portion in the event that the opening/closing rod l9 is broken. Reference numeral 22 denotes an injection sleeve on the injection device side that is movable horizontally and vertically. When the sleeve 21 moves downward and rises, the sleeve 2l is inserted into its inner hole, and the valve seat is opened by the opening/closing rod l9. The molten metal 8 in the hot water supply chamber 6 is supplied into the injection sleeve 22 by opening 21a. A plunger tip 23, which is moved forward and backward by an injection cylinder (not shown), is fitted into the inner hole of the injection sleeve 22, and as the plunger tip 23 rises while connected to a fixed sleeve (not shown) on the mold side, The molten metal 8 in the injection sleeve 22 is injected into the cavity of the mold. Note that for the elevating and lowering structure of the injection sleeve 22 and the plunger tip 23, it is recommended to use a pole screw for smooth movement, as disclosed in Japanese Patent Application No. 1-20053 filed by the present applicant. This is preferable from the viewpoints of improved efficiency and shorter injection cycles. 24 is the sleeve 21
This is a detection rod consisting of a thermocouple that detects the temperature of the molten metal 8 inside. The operation of the automatic water heater configured as described above will be explained. When the furnace 2 is placed in a horizontal position as shown by the solid line in FIG.
The hot water passes through the filter 7 and is stored in the hot water supply chamber 6 at the same level as in the insulating chamber 5. At this time, N2 gas is introduced into the heat preservation room 5 and the hot water supply room 6 to replace the atmosphere with N2 gas.
A gas atmosphere may be used. In this state, the injection sleeve 22
is moved horizontally from the mold side, then raised to the position shown in the figure, and the sleeve 2l is inserted into its inner hole. When the air cylinder 17 operates, the opening/closing rod 19 rises via the piston rod l8 and the valve seat 21a opens, so that the hot water supply chamber 6
The molten metal 8 inside is supplied into the injection sleeve 22. When a predetermined amount of hot water is supplied, the air cylinder 17 is activated, the opening/closing rod 19 is lowered, and the valve seat 21a is closed to stop the hot water supply, so that the injection sleeve 22 moves downward, horizontally, and upwardly. It is joined to the fixed sleeve, and hot water 8 is injected. In such hot water supply, since the molten metal 8 is heated by the heater 3, it does not cool down and is kept warm, and since the filter 7 is provided, hard spots and oxides are filtered out. It does not mix with the molten metal 8 on the hot water supply chamber 6 side. Further, an amount of molten metal 8 corresponding to l injection shots and the amount of hot water supplied passes through the filter 7 and is replenished into the hot water supply chamber 6. When the amount of molten metal in the furnace 2 decreases and the molten metal level becomes below the upper end of the filter 7, air is fed into the head end of the air cylinder 11, the piston rod 16 rises, and the furnace 2 moves the support arm l4. While it is kept stationary, it tilts to the state shown by chain line 2A with bottle 15 as the center. By repeating this tilting and returning to the horizontal position while supplying hot water, the hot water level is kept warm as shown by the symbol 8A in Figure 4. A large amount of the molten metal 8 in the chamber 5 can be taken out. Also, in the unlikely event that the opening/closing rod l9 is broken, the opening/closing rod 19
If the valve seat 21a on the sleeve 2l side that comes into contact with the tip of the sleeve 2l is chipped, the air cylinder l7 will operate and the piston rod 18 will move down significantly, causing the valve part at the proximal end of the opening/closing rod l9 that remains to break off. Since the valve seat 20a is closed, hot water supply is stopped, and at the same time, air is supplied to the rod end side of the air cylinder 11, the piston rod l6 is lowered, and the furnace 2
While swinging the support 7-mu 14, it tilts around the axis 13 to the state shown by the chain line 2B.
As shown by the hot water level, the molten metal 8 in the hot water supply chamber 6 returns to the insulating chamber 5 through the filter 7 and does not go to the hot water supply chamber 6. Therefore, overheating of the piston rod l8 and air cylinder l7 is prevented, and maintenance work can be started immediately. In this embodiment, the heat-retaining furnace 2 is used as an example of the furnace for storing the molten metal 8, but billets can be placed in the furnace and melted directly.
It is also possible to supply hot water directly from this melting furnace to the injection sleeve. [Effects of the Invention] As is clear from the above explanation, according to the present invention, in the case that the opening/closing rod is broken or the valve part on the sleeve side is chipped in the automatic water supply device, high temperature To prevent excess molten metal from overflowing outside the injection sleeve,
Since the valve part can reliably prevent outflow, safety and workability are improved.

[Brief explanation of drawings]

Figures 1 to 4 show an embodiment of the automatic hot water supply device according to the present invention. Figure 1 is a longitudinal sectional view of the first embodiment, and Figure 2 shows the vicinity of the valve stem and the injection sleeve into which it is inserted. A vertical cross-sectional view, FIG. 3 is an enlarged vertical cross-sectional view showing another embodiment near the valve stem, and FIG.
The figure is a partially cutaway schematic side view of the entire unit shown to explain the operation. l...Automatic hot water supply device, 2...
...Furnace, 3...Heater, 4...
... Bulkhead, 5 ... Warming room, 6 ...
...Water supply room, 7...Filter, 8...
... Molten metal, 17 ... Air cylinder, 18.
...Piston rod, 19...Opening/closing rod, 20...Closing ring, 2l...
·sleeve,

Claims (1)

[Claims] A first valve seat with a small diameter is provided on the inner surface near the tip of the cylindrical sleeve, a second valve seat with a large diameter is provided on the inner surface of the upper part of the sleeve, and a first valve seat is provided on the tip of the opening/closing rod having a different diameter. A first valve part that can be opened and closed with respect to the valve seat is provided, and a second valve part that can be made to face the second valve seat is provided on the outer periphery of the stepped part at the rear of the opening/closing rod,
An automatic water heater characterized in that the second valve part is in an open position relative to the second valve seat when the first valve seat is closed at the forward limit of the opening/closing rod. .