JPS5914302B2 - automatic water heater - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a water heater attached to a die-casting machine,
More specifically, the present invention relates to an automatic water heater that controls the position of a ladle and can replenish a crucible with molten metal without stopping the operation of a die-casting machine.

As shown in FIG. 1, die casting machines are generally equipped with an automatic hot water supply device to automatically supply molten metal.

That is, the ladle 2 constituting the automatic hot water supply device automatically pumps up the molten metal (molten metal) 6 stored in the melting furnace 4 via the link mechanism 8, and pours it into the pouring port 12 at the top of the injection cylinder 10 of the die-casting machine. It has the function of transporting to.

Therefore, depending on the capacity of the ladle 2 and the number of times it is carried out,
The molten metal 6 in the melting furnace 4 gradually decreases, and therefore, it is necessary to replenish the molten metal 6 by the amount of decrease.

By the way, as shown in FIGS. 2 and 3, automatic water heaters according to the prior art are equipped with a hot water level tracking device that detects when the ladle reaches molten metal and constantly introduces a constant amount of molten metal into the ladle. We have adopted a configuration that

In this case, the hot water level tracking device consists of a pair of electrode rods 16 and 18 fixed to the ladle support arm 14, and when the ladle 2 is placed in hot water, the tips of the electrode rods 16 and 18 are also placed in hot water at the same time. The fact that the molten metal 6 is a conductor is used to create electrical continuity between the electrode rods 16 and 18, and the ladle 2 is tilted by the conduction signal to introduce the molten metal 6 into the ladle 2.

Therefore, unless sufficient molten metal 6 exists in the melting furnace 4, the state of molten metal deposited on the ladle 2 cannot be detected.

Various timings can be assumed to replenish the molten metal 6 in a shortage state, but currently, if it is done while the ladle 2 is descending into the melting furnace 4, the link mechanism 8 will be stabilized, and therefore the ladle 2 will be refilled. This is the most suitable method because the molten metal 6 is stabilized and the replenished molten metal 6 can be immediately pumped up and carried out.

However, if the ladle 2 is lowered and refilled with molten metal while it remains at 1-', the ladle support arm 14 will be immersed in the molten metal 6 (see Figure 1), and the molten metal 6 will become molten metal under high temperature. Considering this, there is a risk that parts including the ladle support arm 14 etc. may be damaged by this molten metal.

Therefore, when replenishing molten metal, the automatic water supply device must be temporarily stopped.

However, temporary stoppage of the water heater forces the operation of the entire die-casting machine to stop, which shortens the operating time, which is extremely inconvenient for die-casting machines that produce large quantities of products in a short period of time. was.

Therefore, as a result of intensive research and efforts to overcome the above-mentioned problems, the present inventors discovered that in addition to a pair of electrode rods that detect the molten state of the ladle in the crucible of the melting furnace, these electrodes An electrode rod is attached with a detection part located above the rod, and when the molten metal replenished in the melting furnace gradually increases and comes into contact with the detection part, this is detected and the ladle support arm is raised, further increasing the amount of molten metal. If the configuration is such that the lifting movement of the ladle support arm is stopped when the detection part is separated from the molten metal after replenishment is completed, the operation of the die-casting machine can be stopped without immersing the ladle and the ladle support arm in the molten metal. We have found that a device can be obtained that can replenish molten metal without having to do so.

SUMMARY OF THE INVENTION Accordingly, it is a general object of the present invention to maintain the operation of a die casting machine and to provide smooth control for replenishing the melting furnace with missing molten metal by preventing the ladle and the ladle support arm from being immersed in the molten metal. To provide automatic water heating equipment that can perform.

In order to achieve the above object, in the present invention, a link mechanism connected to a drive shaft is provided with a ladle support arm, a ladle is tiltably attached to this support arm, and the molten metal supplied to the crucible is pumped up by the ladle. In an automatic water heater for a die-casting machine configured to be transported to a die-casting machine, a first electrode forming one electrode for the ladle support arm is provided.
The electrode rod and the second and third electrode rods, which are located at different levels and constitute the other electrode, are arranged in parallel with each other facing toward the installation side of the ladle, so that when the ladle is lowered, they are the first to contact the molten metal in the crucible. A relay circuit that commands the ladle to stop descending and start tilting by the first electrode rod and the second electrode rod that are in contact, and then sets the timing for tilting the ladle at a predetermined angle, returning it, and raising the ladle to a predetermined position. means for detecting the lowest position when the first electrode rod and the second electrode rod do not contact the molten metal in the crucible, and stopping the descent of the ladle and injecting a predetermined amount of molten metal into the crucible. a detection means for commanding, and a relay circuit made up of a first electrode rod and a second electrode rod that come into contact with the molten metal in the crucible first when the detection means is activated; On the other hand, the present invention is characterized in that a relay circuit is provided that commands the ladle to rise while the first electrode rod and the third electrode rod are in contact with each other.

Next, preferred embodiments of an automatic hot water supply device that controls the position of a ladle according to the present invention will be described in detail with reference to the accompanying drawings.

In FIG. 4, reference numeral 20 (ζ melting furnace crucible 22
The frame provided at the top is shown.

A shaft 24 is provided at the top and center of the frame 20, respectively.

26 is provided protrudingly, and in particular, an upper arm 28 is provided on the shaft 24.
and the auxiliary arm 30 are pivotally connected.

The distal end of the upper arm 28 is connected to a ladle support arm 34 via a shaft 32, and the distal end of the auxiliary arm 30 is connected to a lower arm 38 via a shaft 36.

The tip of the lower arm 38 is attached to the ladle support arm 34.
The pin member 39 connects to the middle part of the pin member 39 .

It will therefore be appreciated that the upper arm 28, the auxiliary arm 30, the lower arm 38 and the ladle support arm 34 together form a quadrilateral linkage 40.

Further, a shaft 42 protrudes from the tip of the ladle support arm 34, and the ladle 44 is rotatably supported on the shaft 42, while a suitable balance weight 46 is disposed on the axis of the upper arm 28.

Note that the shaft 24 is connected to a rotational drive source (not shown), and the rotational force from this rotational drive source is transmitted to the shaft 42 via a tin rocket vehicle and a chain (none of which are shown) to drive the ladle 44. Configure it to tilt.

Further, at a midway portion of the lower arm 38, the -end portion of the drive arm 48 fixed to the shaft 26 is pivotally connected via a pin member 50.

Therefore, in an automatic water heater configured in this way,
In particular, in the present invention, the electrode rod is arranged close to the ladle 44.

That is, the washer 52 is fixed to the side surface of the ladle support arm 34 in the swinging direction, and the fixture 54 is fixed on the washer 52 in advance.

At this time, the fixture 54 is fixed by inserting and tightening the pair of upper and lower poles 56 and 5B up to the ladle support arm 34 (see FIG. 5).

As can be understood from FIGS. 5 to 7, the fixture 54 is made of a rectangular body, and has holes 60, 62 of different sizes and diameters vertically oriented in the front part thereof, and A hole 64 having the same diameter as the hole 62 is bored behind the hole 62.

An electrode rod 66 (not insulated) is inserted into the hole 60 (
A first electrode rod (first electrode rod) is inserted, and its tip is positioned below the spout 68 of the ladle 44 (see FIG. 4).

On the other hand, an electrode rod 70 (third electrode rod) is inserted into the hole 62 via the bushing T2, and an electrode terminal 74 is attached to the tip thereof. 76 (second electrode body) is engaged.

In this case, the electrode rods 70 and 76 shall be insulated except for the electrode terminals 74 and 78, respectively, and the tip of the electrode terminal 74 is positioned slightly above the tip of the electrode rods 66 and 760. Attach.

Note that the tips of the electrode rods 66 and 760 are arranged so as to occupy the same height.

Electric wires are extended from the tops of the electrode rods 66, 70, 76 configured in this manner through copper tubes 79, 80, 82, respectively, and these electrode rods are connected to a relay that controls the biasing of the drive arm 48. Incorporate into the circuit.

In this case, the circuit diagram shown in FIG. 8 is preferably adopted.

That is, the power supply E and the relay R are connected between the electrode rods 66 and 76.
.

Although the relays R1 and R2 are not shown, they control the energization of the rotational drive source that operates the drive arm 48, and configure the relay paths 5' and 5'J, respectively.

The device of the present invention is configured as described above,
Next, its action and effects will be explained.

In FIG. 4, a rotary drive source (not shown) is energized and the shaft 2 is
6 clockwise, the drive arm 48 operates,
The link mechanism 40 descends.

Therefore, the ladle support arm 3 that constitutes the link mechanism 40
4 also descends and enters the crucible 22 of the melting furnace.

After the ladle 44 comes into contact with the molten metal in the crucible 22, when the tips of the electrode rods 66.760 touch the molten metal, the electrode rods 66.760.
76 constitutes a closed circuit, relay R1 shown in FIG. 8 is energized, and the rotation of the rotational drive source of drive arm 48 is stopped under the action of the relay circuit including relay R1.

Next, another rotational drive source (not shown) is energized to rotate the shaft 24.
When rotates clockwise, this rotational force is transmitted to the shaft 42 via a sprocket wheel and chain (not shown),
The ladle 44 is tilted at a predetermined angle to draw up a predetermined amount of molten metal from the crucible 22 .

Further, after a predetermined period of time has elapsed, the shaft 26 is urged to rotate counterclockwise, raising the link mechanism 40 and conveying the ladle 44 to the position shown by the broken line in FIG. direction, thus moving the ladle 44 to the spout 68.
Tilt it so that it faces downward and pour the melted oil into the lubrication chamber as shown in Figure 1.

By repeating this operation, automatic lubrication is performed.

By the way, when the molten metal in the crucible 22 becomes insufficient, the electrode rods 66, 76 do not receive the molten metal and are not electrically conductive.

When the ladle 44 is in the lowest position and the electrode rods 66, 76 are not conductive, this is detected and the crucible 22 is replenished with molten metal.

The replenishment molten metal in the crucible 22 increases, and the electrode rod TO
When the electrode terminals 74 of the electrodes 66 and 70 come into contact with each other, a closed circuit is formed between the electrode rods 66 and 70, and the relay R2 is energized and the drive arm 48 is rotationally driven under the action of the relay circuit including the relay R2. The source rotates again to pivot drive arm 48 counterclockwise.

This action continues until the electrode terminal 74 separates from the molten metal surface.

Therefore, when the electrode terminal 74 leaves the molten metal, the relay R2
is deenergized and the drive arm completes 480 rotations by the relay circuit including this relay R2.

That is, when the molten metal is replenished and the ladle support arm 34 is about to reach the molten metal due to the amount of molten metal, the electrode rod 66 and the electrode rod 70 maintain a conductive state and the ladle support arm 34
This will prevent the arm 34, ladle 44, etc. from being immersed in the high temperature molten metal.

The amount of replenishing molten metal can be determined by appropriately providing a detection element in the crucible 22 and introducing a signal from the detection element into the molten metal supply source to stop the supply.

Next, the sequence control operations for the lowering and raising operations of the link mechanism 40 and the tilting operations of the ladle support arm 34 using the electrode rods 66, 70, 76 will be summarized as follows.

(2) When a predetermined amount of molten metal is present in the crucible 22 of the melting furnace (2) energizing the rotational drive source to rotate the shaft 26 clockwise;
Drive arm 48 is actuated to lower linkage 40.

(2) When the first electrode rod 66 and the second electrode rod 76 touch the hot water, the relay R1 is energized.

■ Due to the energization of relay R1, (a) the rotational drive source of the shaft 26 is stopped, and the link mechanism 40
(b) Another rotational drive source is energized to rotate the shaft 24 clockwise, and the power is transmitted to the shaft 42 to tilt the ladle 44 at a predetermined angle, thereby pumping the molten metal in the crucible 22 by a predetermined amount. Pump up.

(2) After a predetermined time has elapsed, the rotary drive source is energized to rotate the shaft 26 counterclockwise, raising the link mechanism 40 and transporting the ladle 44 to a predetermined position.

■ At a predetermined position, another rotational drive source is energized to rotate the shaft 24.
The ladle 44 is rotated counterclockwise and tilted so that the spout of the ladle 44 faces downward to pour the metal.

(2) After pouring the molten metal, return the ladle 44 to its original state and return the crank mechanism 40 to the position where it should be lowered.

(2) When the amount of molten metal in the crucible 22 of the melting furnace is less than a predetermined amount, σ is the same as (2) above.

(2) The first electrode rod 66 and the second electrode rod 16 do not reach the hot water, and the lowest state of the crank mechanism 40 is detected.

(a) At this time, the rotational drive source of the shaft 26 is stopped and the link mechanism 40 stops lowering, and (b) replenishment of the molten metal is started.

■While the molten metal is being replenished, even if the first electrode rod 66 and the second electrode rod 76 reach the hot water, the relay R0 becomes inactive, and when the first electrode rod 66 and the third electrode rod 70 reach the hot water, the relay R0 becomes inactive. Relay R2 is energized.

(2) The rotational drive source is energized by the energization of the relay R2, and the shaft 26 is rotated counterclockwise, thereby raising the link mechanism 40.

(2) When the crucible 22 is filled with molten metal to a predetermined level, the replenishment is stopped.

■When the third electrode rod 70 separates from the molten metal, the relay R2 is deenergized, the rotational drive of the shaft 26 is stopped, and the link mechanism 4
0 stops rising.

Thereafter, the steps of (1), (2), (2), (2), and (2) are performed.

According to the present invention, as described above, even if there is a shortage of molten metal in the crucible of the melting furnace, it can be replenished without stopping the operation of the water heater and without immersing the ladle support arm etc. in the molten metal. , it was possible to prevent unnecessary heating or damage to the ladle support arm.

Furthermore, the hot water supply device can be used continuously even while the molten metal is being replenished, so that it is possible to make full use of the operating time of the die casting machine.

The ladle control device according to the present invention has been described above with reference to a preferred embodiment, but the present invention is not limited to this embodiment. For example, a delay timer is connected to relay R2, and an electrode terminal It is also possible to continue raising the ladle support arm for a predetermined period of time even if the ladle is removed from the molten metal.
It goes without saying that various improvements and design changes can be made without departing from the spirit of the invention.

[Brief explanation of the drawing]

FIG. 1 is a partially sectional explanatory diagram of a water heater according to the prior art;
FIG. 2 is a partially omitted side view of a water heater according to the prior art;
FIG. 3 is a partially omitted front view of a refueling device according to the prior art;
FIG. 4 is a partially sectional side view of a refueling system incorporating a ladle control device according to the present invention, FIG. 5 is a partially omitted side view of a ladle control device according to the present invention, and FIG. FIG. 1 is a partially omitted front view of the ladle control device according to the present invention, and FIG. 8 is a partially omitted plan view of the ladle control device according to the present invention.
FIG. 2 is a circuit explanatory diagram of a ladle control device according to the present invention. 20--Frame, 22-- Crucible, 24° 26-- Single axis, 28-- Upper arm, 3
0-... Auxiliary arm, 32... Axis, 34
...Ladle support arm, 36-...single shaft, 3
8...lower arm, 39--pin member, 40--link mechanism, 42--unishaft, 4
4...- Ladle, 46...- Haran weight, 48... Drive arm, pin member, 52...
・-x Gold, 54-...Mounting tool, 56, 58...
-・-Bolt, 60, 62°64... Hole, 6
6...- Electrode rod, 68...- Spout, 70
... Electrode rod, 72 ... Bushu, 14
...... Electrode terminal, 76 - ... Electrode rod, 78
---Electrode terminal, 79.80, 82.8.・−・Steel pipe.

Claims (1)

[Claims] 1. An automatic die-casting machine configured such that a link mechanism connected to a drive shaft is provided with a ladle support arm, a ladle is tiltably attached to this support arm, and molten metal supplied to a crucible is pumped up by the ladle and transported to the die-casting machine. In a water heater, a first electrode rod constituting one electrode with respect to a ladle support arm and second and third electrode rods located at different levels constituting the other electrode are respectively oriented toward the installation side of the ladle and are parallel to each other. The first electrode rod and the second electrode rod are placed in
a relay circuit for instructing the ladle to stop descending and to start tilting the ladle using the electrode rod; and a means for setting the timing for tilting the ladle at a predetermined angle and then returning the ladle to a predetermined position; a detection means for detecting the lowest position when the first electrode rod and the second electrode rod do not contact the molten metal in the crucible and instructing the ladle to stop lowering and to inject a predetermined amount of molten metal into the crucible; When the means is activated, the first electrode rod and the second electrode rod, which are the first to come into contact with the molten metal in the crucible, deactivate the relay circuit, and the first electrode rod and the third electrode rod contact the molten metal in the crucible. An automatic water heater characterized by being provided with a relay circuit that commands the ladle to rise while it is in contact with an electrode rod.