JPS62212049A - Automatic molten metal supplying apparatus - Google Patents

Abstract

PURPOSE:To supply automatically molten metal with accurate rate by selecting a shape of ladle as becoming the constant surface area of the molten metal at any tilting angle of the ladle at the time of pouring the molten metal by tilting the ladle. CONSTITUTION:The ladle 14 is composed in parallel to the both sides and the inner face 15d if formed as radial section, as becoming always the constant surface area P of a virtual horizontal face, which connects the inner face 15D with the edge part of the opening 15c, in the range of the tilting angle theta1-theta2. Further, a memory means, which stores a functional equation composing of the tilting angle theta of the ladle 14 and molten metal weight introduced in the ladle 14 is arranged as combining in this ladle 14. Thus, at the time of introducing the molten metal into the ladle 14 in a crucible, the tilting angle theta, corresponding to the desired molten metal weight is calculated through the above- mentioned memory means, and the ladle 14 is tilted automatically. In this way, the accurate weight of the molten metal is supplied automatically by the ladle.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic hot water supply device, and more particularly to a casting machine in which the shape of the ladle is selected so that the angle of inclination of the ladle corresponds to the amount of hot water supplied, and a mold is installed. When injecting molten metal such as aluminum or zinc into a mold to obtain a cast product of a predetermined shape,
The present invention relates to an automatic hot water supply device configured to accurately introduce a desired amount of hot water into the ladle.

The automatic water heater used when trying to obtain cast products is
Generally, a casting mechanism including a crucible for storing molten metal at a predetermined temperature and a mold, and a casting mechanism disposed between the casting mechanism and the crucible to pump out the molten metal from the crucible and then transport it for casting. It has a conveyance mechanism that pours the metal into the mold from the pouring port of the machine. For this reason, the automatic hot water supply device has a tiltable ladle that pumps out molten metal within the crucible, and the amount of hot water supplied is determined by the angle of inclination of this ladle within the crucible.

By the way, in the prior art, when the amount of hot water to be supplied is determined by tilting the ladle as described above, the inclination angle of the ladle is selected using a mechanical stopper. That is, the stopper is made freely displaceable and configured so that it directly contacts a part of the ladle, and when the ladle is tilted by a force transmission mechanism such as a chain and contacts the stopper, this stopper The stopper acts to prevent the ladle from tilting any further, and the ladle enters the crucible while maintaining that tilt and introduces the molten metal into the crucible. Therefore, the slope of the ladle has generally been regulated by a stopper.

In such a configuration, the amount of molten metal that the ladle pumps out from the crucible depends on the angle of the ladle or the position of the stopper, that is, the displacement length, making it difficult to directly set the amount of molten metal fed from the so-called casting weight. Moreover, when trying to change the ladle itself in response to a change in the mold, for example,
Even if the same amount of hot water is to be injected into the mold, the position of the stopper must be adjusted again because the shape or size of the ladle itself is different.

Furthermore, since the position adjustment of this stopper must be determined extremely minutely, it requires considerable skill and therefore must be relied on by experienced personnel, which essentially requires a preparation period before starting production. In addition, there were disadvantages such as a long period of time and a decrease in production efficiency.

Therefore, the inclination angle of the ladle and the amount of hot water introduced according to the inclination are stored in a data table, the inclination corresponding to the desired amount of hot water is selected, the ladle is tilted, and molten metal is introduced into it. Automatic hot water supply devices have been devised that are configured to transport hot water to a spout.

However, in the automatic water heater described above, since the slope corresponding to each amount of hot water is experimentally measured, the work of creating a data table becomes complicated and takes a considerable amount of time. Furthermore, when using various ladles of different sizes, it is necessary to actually measure the hot water supply amount and inclination for each of the ladles, which makes the preparation work extremely troublesome. As a result, a drawback has been exposed that makes it impossible to carry out the casting process efficiently.

The present invention has been made to overcome the above-mentioned disadvantages, and the present invention selects the shape of the ladle, expresses the inclination angle of the ladle and the amount of molten metal supplied into the ladle by a functional expression, and By storing the formula in a storage device, calculating the slope corresponding to the desired amount of hot water supply, and automatically tilting the ladle, the amount of hot water supply can be easily and accurately set. It is an object of the present invention to provide an automatic hot water supply device that makes it possible to easily use ladle of various sizes just by memorizing a formula.

In order to achieve the above object, the present invention includes an opening for introducing and drawing out the molten metal, and a ladle that tilts within a predetermined inclination angle range to pump up the molten metal and supply it to the mold, When introducing the molten metal by tilting the ladle within the inclination angle range, the shape of the ladle is selected so that the surface area of the molten metal is always constant at any inclination angle of the ladle. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In particular, preferred embodiments of the automatic hot water supply device according to the present invention will be described in detail below with reference to the accompanying drawings.

First, FIG. 1 shows a schematic configuration of an automatic hot water supply device for a casting machine according to the present invention.

In the figure, reference numeral 10 indicates a crucible, and a molten metal 12 of aluminum, zinc, etc. is heated in the crucible 10 and maintained at a predetermined temperature. Ladle 14 is this crucible 1
The molten metal 12 is introduced into the molten metal 12 at a predetermined angle and then pumped up as shown by the broken line. In this case, the shape of the ladle 14 is selected as follows.

That is, as shown in FIGS. 2a and b, the ladle 14
is the angle θ, with respect to the vertical direction. to angle θ2'', the ladle 14 is manufactured so that the molten metal surface area P is constant at least at any angle within this angle range.For example, as shown in FIG. 15a and 15b are configured in parallel,
Within the inclination range from angle θ16 to angle θ2″, the length of the virtual horizontal line connecting the inner surface 15d of the ladle 14 and the end portion 15c that defines the upper opening of this ladle 14 and swings downward is made equal. In addition, the inner surface 15d is formed to have a parabolic cross section. Therefore, if the ladle 14 is inclined within an angle of θ1° to θ2°, the surface area P of the molten metal in the ladle 14 exposed to the outside is reduced at any angle. is constant. In this way, if the surface area P is equal at any angle, the inclination angle of the ladle 14 and the amount of hot water supplied can be expressed by a simple functional equation, as described later.
The shape of the ladle 14 is not limited to the above-mentioned shape, but any shape can be used as long as the surface area P exposed to the outside of the molten metal in the ladle 14 is constant within the range of the predetermined inclination angle θ,'' to θ2@. It may also exhibit

On the other hand, a first arm 16 is pivotally attached to one end of the ladle 14, and a second arm 18 is connected to this first arm 16, and a third arm 16 is pivotably attached to the middle of the first arm 16. Arm 20, the second arm 18, and the third arm 20
A link mechanism 24 is constructed between the fourth arm 22 and the fourth arm 22 which is pivotally connected to the end of the fourth arm 22 .

An arm 26 is pivotally attached to the middle of the third arm 20, and this arm 26 is pivotally attached to a rotational drive shaft 30 of the first rotational drive source 28. A relatively thin arm 32 is attached to the end of the fourth arm 22, and a weight 34 for weight balance is attached to the end of this arm 32.

A second rotary drive source 38 is attached to the upper end of the column 36 that holds the first rotary drive source 28 . Actually, a chain (not shown) is suspended on the rotational drive shaft of the second rotational drive source 38, and this chain is connected to the second arm 18, the first arm 1
The rotational force is transmitted to the ladle 14 by a first chain 40 and a second chain 42 suspended inside the ladle 6.

That is, the sprockets 4 are provided at both ends of the second arm 18.
4.46 is pivotally mounted, and the second chain 42 is suspended from a sprocket (not shown) coaxially mounted to the sprocket 46. One end of the second chain 42 meshes with a sprocket 48 that suspends it, and this sprocket 48 is mounted on a shaft 50 that engages one end of the ladle 14.

On the other hand, a fixed plate 52 that holds a fixed mold (not shown)
has a shot sleeve 54 in a part thereof, and a pouring port 56 is bored in the upper part of one end of the shot sleeve 54. A shot plunger 5 is located inside the shot sleeve 54.
8 is disposed, and this shot plunger 58 can be freely displaced in the horizontal direction in the figure by a shot cylinder (not shown).

Therefore, a control device for adjusting the inclination angle of the ladle 14 will be explained with reference to FIG.

As can be easily understood from the figure, this control device 70 is substantially composed of a microcomputer. That is, the control device 70 has a CPU 72, an input port door 4, an output port door 6, a ROM 78, and a RAM 80 therein. In the ROM 78, the ladle 14 is introduced into the crucible 10, then tilted, then raised and then rotated to convey the molten metal 12 to the pouring port 56, and the molten metal 12 is poured into the shot sleeve 54 by tilting the ladle 14. A program for pouring hot water into the tank is stored. on the other hand,
Functional expressions 80a to 80n (described later) representing the relationship between the inclination angle of each ladle and the amount of hot water supplied are stored in the RAM 80. In this case, if the ladle to be used is limited, the functional formulas 80a to 80n may be fixedly stored in the ROM 2S. The input port door 4 is provided with an input device 8 so that the operator can select the molten metal 12 based on its weight.
On the other hand, the output port door 6 is connected to a second rotary drive source 38, that is, a motor driver 84 for driving a motor. In this case, a rotary encoder 86 is attached to the second rotary drive source 38, and the output signal of the rotary encoder 86 is configured to be finally introduced to the CPU 72 via the input port door 4.

The automatic hot water supply device according to the present invention is basically constructed as described above, and its operation and effects will be explained below with reference to the flowchart shown in FIG.

First, the operator inputs the first arm 1 via the input device 82.
The type of ladle 14 attached to the tip of the ladle 6 is specified (STPI). This signal is passed through the input port door 4 to the C
At PU72, the CPU 72 selects the specified functional formula for the ladle 14 from among the functional formulas 80a to 80n constituting the RAM 80.

Next, the operator specifies, by weight, the amount of molten metal to be poured into a mold (not shown) via the input device 82 (SrF2). This signal passes through the input port door 4
The CPU 72 uses the selected functional expression to calculate the inclination angle corresponding to the weight (SrF
3). A signal related to this tilt angle is read by the CPU 72 and sent to the output port door 6. The output port door 6 sends the signal to the motor driver 84 to drive the second rotational drive source 38 (SrF4). That is, the first rotational drive source 28 rotates the sprocket 44 by a chain (not shown), and the rotation of the sprocket 44 causes the chain 40 to be displaced.

This rotational force of the chain 40 is further applied to the sprocket 4
6 to the chain 42. As a result, the shaft 50 to which the sprocket 48 is attached rotates, and the ladle 14 fixed to one end thereof is displaced. That is, a tilting operation is performed. In this case, the tilt angle is detected, for example, by a rotary encoder 86 attached to the second rotary drive source 38, that is, a motor, and an output signal from the rotary encoder 86 is introduced to the input port door 4.
The output signal from the output port door 6 may be controlled by comparing the signal related to the tilt angle read by the CPU 72 with the output signal of the rotary encoder. Of course,
During this process, it is compared as described above whether the selected angle has been reached, and if the selected tilt angle has not been reached yet, the motor driver 84 is further moved from the output port door 6.
This is continued until the desired tilt angle is reached (SrF5). Therefore, when a desired angle of inclination is obtained, the molten metal 12 is introduced into the ladle 14 in an amount corresponding to the angle of inclination. That is, here, as a result, an amount of molten metal matching the selected weight has been introduced into the interior of the ladle 14.

Therefore, the first rotary drive source 28 is driven again to turn the link mechanism 24 together with the ladle 14, and as shown in FIG.
When the position A is reached, the second rotary drive source 38 drives the ladle 14 to introduce the molten metal 12 into the shot sleeve 54 from the pouring port 56.

When the shot plunger 58 is driven, the molten metal 12 is pushed out from within the shot sleeve 54 into a mold (not shown), and a desired cast product is obtained.

In this case, in the present invention, when the ladle 14 is tilted within a predetermined angle range, that is, within an angle θ1° to an angle θ2′, the surface area P exposed to the outside of the molten metal in the ladle 14 is always constant. The shape of the ladle 14 is selected accordingly. Therefore, when the ladle 14 is tilted by 1" within the above angle range, the weight M (kg) of the molten metal introduced/lead out is
is constant, and the change in the weight of the molten metal with respect to the inclination at an arbitrary angle θ is expressed as M·θr (kg). Therefore, the weight of the molten metal increases or decreases in proportion to the inclination angle of the ladle 14, and when the vertical direction is 0°, the inclination angle θ° and the amount of hot water supplied W are θ= a W + b (1
) (aS b is a coefficient). In this case, the coefficients a and b are selected for the ladle 14 having various different sizes, and the equation (1) is converted into the function equations 80a to 80n shown in FIG.
It can be stored as . Therefore, compared to the case where the inclination angle and hot water supply amount are experimentally measured for each ladle 14, such as when using a data table, the work at the preparatory stage before the production process is simplified and can be performed in a shorter time. becomes possible. Furthermore, even when using many different types of ladle 14, the above-mentioned function equation (1) can be used, and the casting work can be performed even more efficiently.

Next, another embodiment of the automatic water heater according to the present invention is shown in FIGS. 6a and 6b.

In this case, within a predetermined inclination angle range, the ladle 14
At least so that the surface area P of a virtual horizontal plane within the ladle 14a connecting the inner surfaces 88a, 88b of the ladle 14a and the left and right end portions 90a, 90b in the figure, which define the upper opening of the ladle 14a, is constant at any angle. The inner surface 88a, 8
8b is formed to have a parabolic cross section and is symmetrical with respect to the center line H. Further, all the inner surfaces within the ladle 14a may be formed into a paraboloid of revolution.

With the ladle 14a having such a shape, the pouring time can be particularly effectively shortened. That is, after introducing the molten metal into the ladle 14a by tilting the ladle 14a by an angle θ, which is calculated from the desired pouring amount,
The ladle 14a is tilted to an extent that the molten metal does not spill on the shot sleeve 54 side and positioned in a standby state.

In this case, since the ladle 14a has a symmetrical shape, the pumping angle θ3° and the pouring angle θ4. What is θ4@=18
The relational expression 0''-θ3° holds true. Therefore, the effect that the pouring angle θ46 can be calculated extremely easily from the pumping angle θ3″ can be obtained. Therefore, if the ladle 14a on the shot sleeve 54 side is tilted at an angle that is, for example, about 10 degrees less than the pouring angle θ4 degrees obtained from the pumping angle θ3'', it is possible to prevent hot water from spilling from the ladle 14a and pour the hot water. The hot water time can be further shortened.

As described above, according to the present invention, by selecting the shape of the ladle, expressing the inclination angle of the ladle and the amount of hot water supplied by a functional formula, and storing the functional formula in a storage device, a desired value can be obtained from the functional formula. By calculating the inclination angle corresponding to the amount of molten metal supplied, it is possible to automatically supply an accurate amount of molten metal to the casting machine.

For this reason, compared to the conventional method in which the angle of inclination of the ladle is adjusted by the position of a stopper, it is possible to obtain the desired amount of molten metal from the crucible extremely easily. By storing each functional formula, an advantage can be obtained that it becomes possible to easily correspond and efficiently supply molten metal.

Although the present invention has been described above with reference to preferred embodiments, the present invention is not limited to these embodiments, and various improvements and changes in design can be made without departing from the gist of the present invention. Of course.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram of the automatic hot water supply device according to the present invention, Fig. 2 a and b are explanatory diagrams showing the range of inclination angles of the ladle constituting the device of the present invention, and Fig. 3 is a schematic illustration of the ladle constituting the device of the present invention. FIG. 4 is a control circuit diagram of the device of the present invention, FIG. 5 is a flowchart for driving the device of the present invention, and FIG. 6 is a ladle constituting another automatic water heater according to the present invention. FIG. 10... Crucible 12... Molten metal 14.14
a... Ladle 15a, 15b... Side 15d.
...Inner surface 16.18.20.22...Arm 24...Link mechanism 26...Arm 28.
...Rotary drive source 30...Rotary drive shaft 32...
Arm 38...Rotary drive source 50...Axis
52... Fixed plate 54... Shot sleeve 56... Pouring port 58... Shot plunger 70... Control device 72... CPU 74
... Input port door 6 ... Output boat 82 ... Input device 84 ... Motor driver 86 ... Encoder
88a, 88b...Inner surface 9Qa, 90b...Ladle end FIG, 3

Claims (5)

[Claims] (1) The ladle is provided with an opening for introducing and drawing out the molten metal, and includes a ladle that tilts within a predetermined inclination angle range to pump up the molten metal and supply it to the mold, and the ladle is tilted within a predetermined inclination angle range to supply the molten metal to the mold. An automatic water heater characterized in that the shape of the ladle is selected so that the surface area of the molten metal is always constant at any inclination angle of the ladle when the molten metal is introduced by tilting the ladle. (2) The apparatus according to claim 1, further comprising a storage means for storing a functional formula consisting of the inclination angle of the ladle and the weight of the molten metal introduced into the ladle, and a desired An automatic water heater that tilts the ladle by calculating the angle of inclination corresponding to the amount of molten metal. (3) The apparatus according to claim 1, which defines an opening and includes one end of the upper part of the ladle that swings downward when introducing the molten metal, and an inner surface of the ladle that corresponds to the one end of the upper part. An automatic water heater in which at least the inner surface of the ladle is formed to have a parabolic cross section so that the surface area of a virtual horizontal plane within the ladle to be connected is constant within a predetermined inclination angle range. (4) In the apparatus according to claim 1, the surface area of the virtual horizontal plane in the ladle connecting both ends of the upper part of the ladle through which the molten metal is introduced and taken out and the inner surface of each ladle corresponding to the both ends of the upper part has a predetermined inclination. An automatic hot water supply device in which at least the inner surface of each of the ladle is formed to have a symmetrical parabolic cross section so as to be constant within an angular range. (5) An automatic hot water supply device according to claim 4, in which the inner surface of the ladle is formed into a paraboloid of revolution.