JPH0710843Y2 - Water heater - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention is a machine that melts a molten metal from a holding furnace by swinging and vertically moving an arm in synchronization with a casting cycle of a die casting machine and using a ladle attached to the tip of the arm. The present invention relates to a swing arm type hot water supply device that pumps the molten metal into the injection sleeve automatically.

<Prior Art and Problems Thereof> Generally, in this type of swing arm type hot water supply apparatus, after the hot water supply to the injection sleeve is completed, the arm for tiltably supporting the ladle is swing-moved to the holding furnace side, and When the ladle is returned to and the molten metal is pumped up from the holding furnace, the detection signal (braking signal) is output from the molten metal level detector (electrode rod, etc.) that is installed in a state of protruding (drooping) from the tip of the arm. The ladle is immersed (immersed) in the molten metal in the holding furnace by lowering the arm to the moving limit, in other words, the lower moving limit where the melt level detector contacts the molten metal in the holding furnace. , The arm is moved up and the molten metal is drawn into the ladle.

However, since the conventional hot water supply device has the molten metal surface detector fixedly attached to the tip of the arm, the molten metal surface detector does not allow the arm to descend to the lower limit of movement so that the ladle is immersed in the molten metal in the holding furnace. From the time it takes to draw the molten metal into the ladle and move it upwardly, it is exposed to the high heat of the molten metal while it is in contact with the molten metal. As the oxide progresses, the oxide on the surface of the molten metal tends to adhere, and the oxide accumulates in an icicle shape, and the deposited oxide serves as a molten metal level detection contact and pumps the molten metal under regular molten metal level detection. I can't.

In other words, this kind of hot water supply device is one that quantitatively pumps the molten metal from the holding furnace for each casting cycle of the die-casting machine under preset quantitative control, and quantitatively pumps the molten metal pumped into the ladle into the injection sleeve. However, the fact that oxides adhere to and deposit on the molten metal detector in an icicle-like manner prevents normal molten metal surface detection because the lower limit position of the arm movement is displaced and the ladle is held in the molten metal in the holding furnace. The molten metal is not dipped to the proper position, so that the molten metal cannot be quantitatively pumped from the holding furnace, which also causes an insufficient situation in which the filling rate of the molten metal in the mold cavity becomes insufficient, resulting in defective products. There is danger.

Further, a bath level detector equipped in this type of hot water supply device energizes when two electrode rods are hung in parallel and both electrode rods simultaneously contact the bath surface, whereby a detection signal is sent to the hot water supply device. Since the mainstream is to output to the drive source (motor with brake, etc.) so as to brake the limit of the downward movement of the arm,
If the oxide adheres and accumulates in an icicle shape, an erroneous signal is output such that both electrode rods are energized by the oxide during swing movement of the arm or the like, causing a hot water supply problem.

<Problems to be Solved by the Invention> The present invention has been made in view of such conventional problems, and the technical problem to be solved is to make the contact time of the molten metal surface detector with the molten metal as long as possible. It should be short so that it does not receive the high heat (thermal shock) of the molten metal.

<Means for Achieving the Technical Problem> The technical means taken by the present invention to achieve the above object is a swing arm type hot water supply apparatus, in which a vertical drive mechanism is attached to the arm, and the vertical drive mechanism is attached to the vertical drive mechanism. The molten metal level detector is connected and supported, the molten metal level detector is attached to the tip of the arm so as to be vertically movable, and the molten metal level detector and the vertical drive mechanism are electrically connected. Is.

<Operation> Accordingly, according to the above-mentioned technical means of the present invention, the arm is swung to the holding furnace side, and when the molten metal is drawn by the ladle, the arm starts descending movement and reaches its movement limit. When the molten metal surface detector protruding from the tip of the arm touches the molten metal surface and a detection signal is output from this detector, the vertical drive mechanism operates to raise the molten metal surface detector and separate it from the molten metal surface.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings.
In the figure, A is a swing arm type water heater, B is a holding furnace, C is a die casting machine, and D is an arm 1 of the water heater A.
Holding furnace B, which is tiltably supported by a known structure at its tip
A ladle for pumping the molten metal M from the inside, E is an injection sleeve fitted and mounted on a fixed platen C ₁ of the die casting machine C, and a molten metal level detector 2 is attached to the tip of the arm 1 so as to be movable up and down. When the molten metal M in the holding furnace B is pumped up, the molten metal level detector 2 is made to project downward from the tip of the arm 1 with a predetermined protrusion height, and is raised after detecting the molten metal level m to raise the molten metal level detector 2 It is set apart from the surface m.

The melt level detector 2 is composed of two well-known electrode rods, and in this embodiment, the protection tube 2a is formed in a long shape and the protection tube 2a is vertically slidably inserted. The first supporting cylinder 3 to be supported is attached to the lower end portion of the arm 1, and the second supporting cylinder 4 is attached to the upper portion of the axial extension line of the first supporting cylinder 3 to attach the arm 1 to the arm 1.
It is attached so that it can move up and down.

Then, a connecting portion 5 is provided at the upper end of the molten metal surface detector 2 protruding from the second support cylinder 4, and the connecting portion 5 is connected to the vertical drive mechanism 7 via the coupling 6, and is stopped by the vertical drive mechanism 7. Wear and support.

The up-and-down drive mechanism 7 operates under the detection signal output from the molten metal level detector 2 to move the molten metal level detector 2 upward, and after a desired time elapses after the upward movement, the In the embodiment, after the molten metal M is supplied to the injection sleeve E, when the arm 1 is swung to the holding furnace B side and the ladle D is returned onto the holding furnace B, the molten metal level detector 2 is turned on. It is moved downward to support the molten metal surface detector 2 in the original state and the detected state in which it is projected from the tip of the arm 1, and a hydraulic or air cylinder is used. It is preferable to use an air cylinder as the up-and-down drive mechanism 7 which has a faster start-up operation and a smaller error in the operation range than the hydraulic cylinder.

The vertical drive mechanism 7 (air cylinder) is used for the bath level detector 2.
It is electrically connected to the molten metal level detector 2 so as to start the operation (the rising motion of the molten metal level detector 2) by the molten metal level detection signal output from the molten metal level, that is, the arm is activated by the detected signal from the molten metal level detector 2. The driving source (motor with brake, etc.) of the hot water supply device A and the molten metal level detector 2 are electrically connected so that the downward movement limit of the holding furnace B of No. 1 is braked. The drive source (compressed air generator) of the mechanism 7 is electrically connected to the molten metal level detector 2 and closely attached to the arm 1, and the molten metal level detector 2 (electrode) is attached to the tip of the (cylinder rod) of the drive rod 7. (Bar) The connection part 5 at the upper end is connected and supported by the coupling 6, and the molten metal surface detector 2 is mounted on the tip of the arm 1 so as to be vertically movable.

In addition, the electrode wire 8 (conductor wire, etc.) of the molten metal surface detector 2 is externally drawn out by providing a drawing groove 10 in communication with the internal insertion hole 9 on the upper end surface of the connecting portion 5, and drawing out in the opposite communication with the drawing groove 10. A hole 11 is provided in the coupling 6 to draw out the electrode wire 8 to the outside, and wiring connection is made between the drive source of the hot water supply device A (motor with a brake or the like) and the drive source of the vertical drive mechanism 7 (see FIG. 2). (See enlarged section and FIG. 3).

Thus, according to the present embodiment configured as described above, the hot water supply apparatus A moves the arm 1 downward in conjunction with the casting cycle of the die casting machine C to start pumping the molten metal M by the ladle D, and the arm 1 When the tip of the protective tube 2a of the molten metal surface detector 2 that electrically brakes the descending movement limit of the molten metal comes into contact with the molten metal surface m and a detection signal is output, the vertical drive mechanism 7 operates and the molten metal surface detector 2
Is moved up and away from the surface m. At this time, the melt level detector 2 is stopped and supported in the ascending region in which the tip of the protective tube 2a sinks into the first support cylinder 3 (see the chain double-dashed line in FIG. 2), so that the melt level m cannot be formed. Even if the oxide adheres to the tip of the protection tube 2a, the oxide is removed at the lower opening edge of the support tube 3 by the immersion of the tip of the protection tube 2a into the first support tube 3.

Then, the molten metal M is pumped into the ladle D immersed in the molten metal M, and the arm 1 of the water heating apparatus A is moved upward and is swung to the injection sleeve E side to move the injection sleeve E.
After the hot water is supplied to the holding furnace B, the arm 1 is swung to the holding furnace B side and the ladle D is retracted back onto the holding furnace E, and the up-and-down drive mechanism 7 operates to move the molten metal level detector 2 downward to move the molten metal. The detector 2 is returned to the detection state in which it is projected from the lower end of the arm 1.

<Effect of Device> Since the hot water supply device of the present invention is configured as described above, the following operational effects are obtained.

The arm equipped with the ladle is swing-moved to the holding furnace side, and after that, when the arm starts descending movement and the molten metal level detector swings to the molten metal level and the molten metal level detector outputs a detection signal,
The up-and-down drive mechanism operates to move the molten metal surface detector upward and separate it from the molten metal surface.

Therefore, the molten metal level detector outputs the detection signal and at the same time is separated from the molten metal irrespective of the upward movement of the arm. Therefore, deterioration of the heat resistance strength due to high heat (thermal shock) of the molten metal is prevented and corrosion level detection is performed while preventing erosion. The service life of the vessel can be extended.

Therefore, the intended purpose could be achieved.

[Brief description of drawings]

The drawing shows an example of the embodiment of the hot water supply device of the present invention. Fig. 1 is a front view, Fig. 2 is an enlarged cross-sectional view of a main part, and Fig. 3 is a cross-sectional view taken along line (III)-(III) of Fig. 2. is there. In the figure, A: Hot water supply device, B: Holding furnace C: Die casting machine, D: Ladle E: Injection sleeve, 1: Arm 2: Level detector, 7: Vertical drive mechanism

Claims (1)

[Scope of utility model registration request] 1. A swing movement and an up-and-down movement of an arm interlocking with a casting cycle of a die casting machine to mechanically pump up the molten metal from a holding furnace by a ladle attached to the tip of the arm, and automatically supply the molten metal into an injection sleeve. In a swing arm type hot water supply device, a vertical drive mechanism is attached to the arm, and the vertical surface drive mechanism is connected to and supports a molten metal level detector, and the molten metal level detector is mounted on the tip of the arm so as to be vertically movable. A hot water supply device characterized in that the hot water level detector and the vertical drive mechanism are electrically connected to each other.