JPH0141434B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for controlling a water heater, and more specifically, when a molten metal such as aluminum or zinc is injected into a casting machine equipped with a mold to obtain a cast product of a predetermined shape, the ladle A hot water supply device that automatically determines a pouring standby angle of the ladle before starting pouring from shape data and the amount of molten metal introduced into the ladle, and makes it possible to tilt the ladle to the pouring standby angle. Concerning a control method.

When attempting to obtain a cast product using a casting machine, an automatic water heater has conventionally been employed. An automatic hot water supply device is generally installed between a crucible that stores molten metal at a predetermined temperature and a casting machine, and pumps out the molten metal from the crucible and transports it into the mold of the casting machine. It is configured to be injected into the In this case, the automatic water heater has a tiltable ladle, and the tilting action of the ladle injects the molten metal into the mold.

By the way, when pouring the molten metal into the mold by tilting the ladle, if the liquid level of the molten metal introduced into the ladle does not reach the pouring port of the ladle at the pouring position, the molten metal may not reach the mold. The pouring operation starts substantially from the time when the ladle is tilted by a predetermined angle. Therefore, there is a considerable amount of wasted time before the pouring of molten metal starts, and a problem arises in that the pouring time cannot be shortened.

Therefore, conventionally, a method has been adopted in which the ladle is kept on standby at a predetermined angle at the pouring position, and the pouring operation is immediately started based on a pouring start command to shorten the pouring time. There is. In this case, the pouring standby angle of the ladle is controlled by a combination of a mechanical stopper and a limit switch. That is, when the stopper is disposed on the rotating shaft of the ladle, and the stopper rotating together with the ladle comes into contact with a limit switch,
The ladle is configured to stop rotating. Therefore, the angle of inclination of the ladle is generally controlled by the position of the stopper.

However, with such a configuration, the position of the stopper must be adjusted every time the amount of molten metal introduced into the ladle or the shape of the ladle is changed, and this operation becomes very troublesome. There is. In addition, since the position adjustment of the stopper must be determined extremely minutely, it requires considerable skill and must be relied on by experienced personnel, which substantially reduces the preparation time before starting production. In addition, it has been pointed out that there are disadvantages such as a long process and a decrease in production efficiency.

The present invention has been made to overcome the above-mentioned disadvantages, and automatically determines the pouring standby angle of the ladle before starting pouring at the pouring position based on the ladle shape data and the amount of molten metal introduced into the ladle. By determining this and tilting the ladle to the pouring standby angle in advance, it is possible to automatically control the pouring time to shorten the pouring time and perform an optimal pouring operation.
It is an object of the present invention to provide a method for controlling a water heater that further improves production efficiency.

In order to achieve the above object, the present invention selects a ladle, further obtains a pouring standby angle signal immediately before pouring of the selected ladle from the amount of molten metal introduced into the selected ladle, and The ladle is tilted to the pouring standby angle before starting pouring based on a pouring standby angle signal.

Next, the method for controlling a water heater according to the present invention will be described in detail below with reference to the accompanying drawings, citing preferred embodiments in relation to the apparatus that implements the method.

FIG. 1 shows a schematic configuration of a water heater according to the present invention. In the figure, reference numeral 10 indicates a crucible, into which a molten metal 12 of aluminum or zinc is introduced and maintained at a predetermined temperature. A ladle 14 is introduced into this crucible 10,
The molten metal 12 is introduced into the molten metal at a predetermined angle and then pumped up as shown by the broken line. In this case, a first arm 16 is pivotally attached to one end of the ladle 14, and a second arm 18 is connected to the first arm 16, and a second arm 18 is pivotably attached to the middle of the first arm 16. The link mechanism 2 is connected between the third arm 20 and the fourth arm 22 which is pivotally connected to the ends of the second arm 18 and the third arm 20.
4 is composed. 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. On the other hand, an 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 the arm 32. A motor 38 serving as a second rotational drive source is attached to the upper end of the column 36 that holds the first rotational drive source 28 . In fact, a chain (not shown) is suspended on the rotary drive shaft of the motor 38, and this chain is connected to the second arm 18, a first chain 40 and a second chain 42 suspended inside the first arm 16. The rotational force is transmitted to the ladle 14. That is, sprockets 44 and 46 are pivotally attached to both ends of the second arm 18, and the second chain 42 is suspended on a sprocket (not shown) that is coaxially attached to the sprocket 46. One end of the second chain 42 meshes with a sprocket 48 that suspends it, and the sprocket 48 is mounted on a shaft 50 that engages one end of the ladle 14.

On the other hand, a fixed plate 52 holding 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. Short sleeve 54
A shot plunger 58 is disposed inside, and this shot plunger 58 is movable horizontally 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 FIGS. 2 and 3.

As can be easily understood from the figure, this control device 70 is substantially composed of a microcomputer. That is, the control device 70 includes a CPU 72, an input port 74, and an output port 76.
, a program memory 78 , and a data memory 80 . The program memory 78 includes the steps of introducing the ladle 14 into the crucible 10, then tilting it, then rising and turning it back to convey the molten metal 12 to the pouring port 56, and tilting the ladle 14 at a predetermined angle at the pouring port 56. After waiting in the molten metal 12
A program for pouring molten metal into the shot sleeve 54 is stored. On the other hand, data memory 8
0 includes data tables 81a to 81n that correspond to the weight W of the molten metal 12 and the inclination angle θ ₁ of the ladle 14 when the molten metal 12 is pumped from the crucible 10 according to n types of ladle shapes, and the weight W and ladle 14 at pour spout 56
It includes data tables 83a to 83n that associate the pouring standby angle θ _{2 of 2} with n types of ladle shapes. An input device 82 is connected to the input port 74 so that the operator can select the state of the ladle 14 based on the weight W of the molten metal 12 and the shape of the ladle, while the output port 76 is connected to a second rotary drive source, That is, it is connected to a motor driver 84 for driving the motor 38. In this case, a rotary encoder 86 is attached to the rotational drive shaft of the motor 38.
The output signal of this rotary encoder 86 is finally sent to the CPU 7 via the input port 74.
2.

The apparatus for carrying out the method of the present invention is basically constructed as described above, and its operation will be explained below with reference to the flowchart shown in FIG.

First, the operator inputs the first
Ladle 14 attached to the tip of arm 16
Identify the type (STP1). This signal reaches the CPU 72 via an input port 74, and the CPU 72 inputs a data table 81 that constitutes a data memory 80.
The specified ladder 14 from a to 81n
Select the table. Next, the operator specifies, by weight, the amount of molten metal to be poured into a mold (not shown) via the input device 82 (STP2). This signal is sent to the CPU via input port 74.
72, the CPU 72 selects the tilt angle θ ₁ of the ladle 14 corresponding to the weight from the selected data tables 81a to 81n (STP3). After the start of operation, a signal related to the tilt angle θ ₁ is read out by the CPU 72 and sent to the output port 76 . The output port 76 sends the signal to the motor driver 84 to drive the motor 38 (STP4). That is, the motor 38 rotates the sprocket 44 by means of a chain (not shown), and the rotation of the sprocket 44 causes the chain 40 to be displaced. The rotational force of this chain 40 is
It is further transmitted from sprocket 46 to chain 42. This causes the shaft 50 to which the sprocket 48 is mounted to rotate, and the ladle 14 fixed to one end of the shaft 50 to be displaced. In other words, it will be tilted. In this case, the inclination angle of the ladle is detected by a rotary encoder 86 attached to the second rotational drive source, that is, the motor 38, and an output signal from the rotary encoder 86 is introduced to the input port 74. And CPU7
2 is compared with the output signal of the rotary encoder ₈₆ , and the output signal from the output port 76 is controlled. Of course,
During this process, it is compared as described above whether the selected inclination angle θ ₁ has been reached, and if the selected inclination angle θ ₁ has not been reached yet, the output is further output from the output port 76 to the motor driver 84. Send a signal and continue to do so until the desired inclination angle θ ₁ is reached (STP5). Here _, the ladle 14 is located at the molten metal pumping position _A shown in FIG. introduced in large quantities. That is, here, as a result, the amount of molten metal matching the selected weight has been introduced into the interior of the ladle 14 (STP6).

Therefore, the first rotary drive source 28 is driven again to displace the link mechanism 24, and a third rotary drive source (not shown) moves the link mechanism 24 to the ladle 14.
At the same time, the ladle 14 is rotated and displaced to position the ladle 14 at the pouring standby position B shown in FIG. 3 (STP7).
When the ladle 14 is positioned at the pouring standby position B, the CPU 72 selects a table corresponding to the shape of the ladle from among the data tables 83a to 83n constituting the data memory 80. Then, the molten metal 12 introduced into the ladle 14 from the table
The pouring standby angle θ ₂ of the ladle 14 corresponding to the weight W of
is selected (STP8). A signal related to this pouring standby angle θ ₂ is read by the CPU 72 and sent to the output port 76 . The motor driver 84 receiving the signal from the output port 76 drives the motor 38.
The ladle 14 is rotated to set the pouring standby angle θ ₂ as in the case described above (STP9). In this case, the pouring standby angle θ ₂ is determined by the rotary encoder 86.
The angle is detected by the rotary encoder 86, and the output signal from the rotary encoder 86 is fed back to the input port 74 (STP10). Here, the pouring standby angle θ ₂ at the pouring standby position B is preferably set to be slightly smaller than the pouring start angle in order to prevent the molten metal from overflowing from the ladle 14 during standby.

After the ladle 14 is thus set at the pouring standby angle θ ₂ at the pouring standby position B, when a pouring command signal is input to the CPU 72 via the input port 74 (STP11), the motor driver 84 rotates the motor 38 and tilts the ladle 14. As a result, the molten metal 12 introduced into the ladle 14 is introduced into the shot sleeve 54 through the pouring port 56 (STP12). The shot plunger 58 is driven, and the molten metal 12 is extruded from the inside of the shot sleeve 54 into the inside of a mold (not shown) to obtain a desired cast product.

Here, in the embodiment described above, the correspondence relationship between the weight W of the molten metal 12 and the inclination angle θ ₁ of the ladle 14 and the correspondence relationship between the weight W of the molten metal 12 and the pouring standby angle θ ₂ of the ladle 14 are explained.
Data tables 81a to 81 show the correspondence relationships with
1n and 83a to 83n in the data memory 80. Therefore, if the correspondence between the weight W of the molten metal 12 and the inclination angles θ ₁ and θ ₂ can be calculated functionally, the functional formula can be stored as a program in the program memory 78 and inputted from the input device 82. Based on the weight W of the molten metal 12 and the shape data of the ladle 14, the desired inclination angle θ ₁ and pouring standby angle θ ₂ can be calculated by the above-mentioned functional formula. In this case, the data area of the data memory 80 storing the data tables 81a to 81n and 83a to 83n can be reduced, resulting in an extremely economical effect.

As described above, according to the present invention, the ladle pouring standby angle immediately before pouring can be automatically set from the shape data of the ladle and the amount of molten metal introduced into the ladle. Therefore, there is no need for the operator to adjust the position of the stopper every time the shape of the ladle or the amount of molten metal is changed, unlike in the past, and this hassle is eliminated. Moreover, in this case, the ladle is set to the optimal state in the pouring standby position, so
When the pouring command signal is received, the pouring operation is immediately started, resulting in a dramatic improvement in production efficiency.

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 a water heater to which the method according to the present invention is applied, Fig. 2 is a control circuit diagram for implementing the method according to the present invention, and Fig. 3 is a state of the ladle in the method according to the present invention. FIG. 4 is a flowchart for carrying out the method according to the present invention. 10... Crucible, 12... Molten metal, 14... Ladle, 16, 18, 20, 22... Arm, 24...
... Link mechanism, 26 ... Arm, 28 ... Rotation drive source, 30 ... Rotation drive shaft, 32 ... Arm, 3
4... Weight, 36... Pillar, 38... Motor, 4
0,42...Chain, 44,46,48...Sprocket, 50...Shaft, 52...Fixing plate, 54...Shot sleeve, 56...Pouring spout, 58...Shot plunger, 70... Control device, 72...CPU, 81a to 81n, 83a
~83n...table.

Claims (1)

[Scope of Claims] 1 Select a ladle, further obtain a pouring standby angle signal immediately before pouring the selected ladle from the amount of molten metal introduced into the selected ladle, and obtain the pouring standby angle signal of the selected ladle immediately before pouring. A method of controlling a hot water supply apparatus, characterized in that the ladle is tilted to the pouring standby angle before starting pouring based on the following. 2. In the method described in claim 1,
A method for controlling a hot water supply apparatus, in which a pouring standby angle is stored in advance in a data table constituting a storage device, and a specific said pouring standby angle is selected based on a designated molten metal weight signal and a ladle is tilted. 3. In the method described in claim 1,
A relational expression between the pouring standby angle and the amount of molten metal, which is set corresponding to the ladle shape, is stored in advance in the storage device.
A method of controlling a hot water supply apparatus, comprising calculating the pouring standby angle from the relational expression and tilting the ladle. 4. In the method described in claim 1,
A method of controlling a water heater in which the waiting angle for pouring hot water is set to be smaller by a predetermined amount than the angle of inclination of the ladle at the time of starting pouring.