JPH0317587B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides an automatic control of a stopper for repeatedly dispensing molten metal from a reservoir, which adjusts the stroke of the stopper as a function of time in order to match the outflow rate to the suction rate of the mold. This invention relates to a control device for

In known control devices of this type, the casting time and the lift of the stopper, as well as indirectly the casting speed, can be specified in analog form, for example by means of a potentiometer, or in digital form. Setting the adjusting element, for example a potentiometer, generally takes place without any difficulty for the personnel. However, setting the proper pour curve for a new mold is extremely tedious and time consuming for the casting equipment personnel. This is because the effects of changes in set values are not necessarily foreseen. Therefore, it has not been possible to optimally match the pouring curve to the mold suction with such equipment.

An object of the present invention is to provide a control device that automatically controls the setting of a new casting curve by a staff member and allows the optimum matching of the casting curve to the suction amount of the mold. It is on offer.

The pouring curve should correspond as closely as possible to the manually controlled pouring curve.

The above object is achieved by the present invention as follows. That is, an operating lever for manual operation of the stopper mechanically acts on a potentiometer or the like that constitutes a reference element, and this reference element is coupled to a storage unit so that the position of the reference element is memorized in accordance with time. In the case of manual dispensing, the stopper operation device section connects the reference element via the switch device section,
In addition, in the case of automatic dispensing, it can be combined with the output of the storage unit, and when the reference element is connected to the stopper operation unit, the position of the reference element can be memorized according to time. Ru.

Another feature of the invention is the provision of a toggle switch for connecting manual or automatic dispensing. Additionally, a switch is provided on the reference element, and when the operating lever is moved from the zero position, the switch sends a control pulse to a logic circuit, which signals the start of casting. The storage section itself, which is designed as a digital storage section, is preferably connected via an analog-to-digital converter to the reference element potentiometer and via a digital-to-analog converter to the stop-operation control section. The electrical connection between the reference element and the stopper operation control unit can be via an analog-to-digital converter and a digital-to-analog converter, but it is also possible to connect the reference element directly to the stopper operation control unit. A further feature of the invention is that analog-to-digital or digital-to-analog converters can be omitted if an angle coder or the like is used as the reference element, or if the store operating device can be driven with digital values. . Even when using a potentiometer as a reference element, an analog-to-digital or digital-to-analog converter can be avoided if an analog storage device is used in the storage section.

Embodiments of the present invention will be described below with reference to the drawings.

Each of the control devices of the embodiments shown in FIGS. 1 to 4 consists of three constituent units. That is, these units are the operating section electronic switch device section 5 and the stopper operating device section 6. In the embodiment shown in FIG. 1, the operating section 1 includes a potentiometer 4 and a switch 3. As shown in FIG. The potentiometer is operated by an operating lever 2. When the operating lever 2 leaves the zero position, the switch 3 is activated. Furthermore, in addition to this switch 3, other switches may be provided which are opened and closed at various positions of the operating lever. A switch 3 disposed on the operating section 1 and a logic circuit 13 are connected via a wiring 12 . In this embodiment, the logic circuit 13 generates a sampling frequency for sampling the position of the reference element. This logic circuit can also be used for other switching operations. logic circuit 13
The sampling frequency generated in is stored in the storage unit 2.
Sent to 6.

The stopper operating device part 6 essentially consists of an electromagnetic transducer 7 which converts an electrical signal into a relative movement and causes the stopper 8 to be moved via a mechanism 11 . As a result, the opening of the spout 10 of the casting container 9, which is constituted by a furnace or the like, is changed according to a predetermined casting curve.

A signal proportional to the position of potentiometer 4 is
Analog-to-digital converter 17 via wiring 18
sent to. An outlet of the analog-to-digital converter 17 is connected to one contact of the changeover switch 15 via a wiring 19. Further, the analog-to-digital converter 17 is connected to a storage unit 26 via wiring 20,
The output of the storage unit 26 is connected to the other contact of the changeover switch 15 via a wiring 21. The changeover switch 15 communicates with the input of the digital-to-analog converter 22 , and the output of the digital-to-analog converter 22 is connected to the summing element 23 . Adding element 23
Also, the value of the reference level set by the potentiometer 24 is sent. In order to ensure complete closure of the stopper, the wear of the stopper during the casting operation is taken into account by adjusting the potentiometer 24. A signal consisting of the casting curve and the reference level is sent via the line 25 to the transducer 7 for actuating the stopper.

The switch 14 determines whether the casting operation is carried out manually using the operating lever 2 or automatically by recalling a casting curve stored in the storage unit 26. The switching contact 15 is accordingly switched by the connecting wire 16 and the signal is sent to the logic circuit 13, so that in the case of manual operation, the casting curve is simultaneously stored in the storage unit 26 via the wire 20. On the other hand, in the case of automatic operation, the stored curve is sent via wiring 21 to a control device for operating the stopper.

The embodiment shown in FIG. 2 differs from FIG. 1 only in the arrangement of the analog-to-digital converter 17 and the digital-to-analog converter 22. potentiometer 4
The output of the oscillator 1 coupled to the oscillator 1 is directly connected to the contact of the changeover switch 15 via the wiring 27, while the changeover switch 15 communicates with the adder 23. A parallel branch section runs from the output coupled with the potentiometer 4 to the analog-to-digital converter 17 via a wiring 28 to the digital-to-analog converter 22 via the storage unit 26, and from there to the changeover switch 15. reaches the second contact point.

As a sampling frequency, a frequency of 10 Hz is generally sufficient. This is because this frequency is generally much higher than the maximum frequency of the stopper. After the manual casting operation is completed, when the operating lever 2 is returned to the zero position, the programming of the memory unit is completed and the switch 14 can be switched to automatic dispensing. The casting operation can be interrupted at any time by means of a stopper button. If the stored casting curve is no longer optimal for some reason, a new casting curve can be easily written into the storage unit 26. Simply set the switch 14 to manual pouring and operate the operating lever 2 according to the new pouring curve. Simultaneously with dispensing, this curve is stored in the storage unit 26.

In another embodiment of the invention, shown in FIG. 3, a digital angle-encoded reference element 32 is used as the reference element for the casting curve. The digital value appearing at the output can directly drive the digital storage section 26 via the wiring 30. The output of the storage unit is connected to one contact of the changeover switch 15. The other contact of the changeover switch is
It is coupled to the output of digital reference element 32 via wiring 27 . Addition element 3 constituting the addition device section
3, digitally controlled components are used in this embodiment. This eliminates a digital-to-analog converter and an analog-to-digital converter.

As reference level transmitter 35, a digital transmitter is also used. Electromagnetic transducer 36 is also digitally driven.

FIG. 4 shows an analog reference element 4 similar to FIG.
12 shows still another embodiment of the present invention, in which the summing element 23 is connected via a wiring 27 to an adding element 23 constituting an adding device section. Also, the output of potentiometer 4 is wired 3
0 to the analog storage unit 34;
The output of the analog storage unit is connected to the contacts of the changeover switch 15 via wiring 31. By using an analog storage section, analog-to-digital converters and digital-to-analog converters are eliminated.

Although the embodiments of the present invention have been described above, the present invention is not limited to the illustrated embodiments. For example, when pouring into molds with different suction amounts, the pouring curve may be stored. Furthermore, the casting mold can be provided with an indicator of the relevant casting curve, and depending on the situation, the mold can be configured to be automatically referred to.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an embodiment of a control device of the present invention having an analog-to-digital converter, a digital-to-analog converter, and a digital control storage unit, and FIG. 2 is a schematic diagram of another embodiment that is a modification of FIG. 1. 3 is a schematic diagram of another embodiment of the invention with a transmitter with a digital reference element and a stop actuator input for digital values; FIG. 4 is a storage device for analog values; FIG. 2 is a schematic configuration diagram of another embodiment of the present invention having a section. DESCRIPTION OF SYMBOLS 1... Operation part, 2... Operation lever, 3... Switch, 4... Reference element, 5... Switch device part,
6...stopper operation device section, 26...memory device section, 32...reference element, 34...memory device section.

Claims (1)

[Claims] 1. A control device for repeatedly dispensing molten metal from a spout 10 of a reservoir 9, which can be closed with a stopper 8, under temporal control and in accordance with the relevant absorption amount of the mold. In the manual operation lever 2 of the operation unit 1, the reference element 4,
32, and the output signal of the operating section 1 is stored in a storage section 2 that stores the position of the reference element according to time.
6, 34 and a first input terminal of the selector switch 15; the output signal of the storage device section 26, 34 is directly connected to the second input terminal of the selector switch 15; A signal connected to the output of the changeover switch 15 controls the stopper operation control unit 6, and the changeover switch 15 has a first input for manually dispensing the molten metal from the storage tank 9. The changeover switch 15 is controlled via a manual/automatic changeover switch 14 such that one end is connected to the output end and a second input end is connected to the output end for automatic dispensing. A control device characterized by: 2. The control device according to claim 1, wherein the frequency generated by the logic circuit 13 is used as the sampling frequency of the casting curve for the storage device sections 26 and 34. 3. A potentiometer 4 provided in the operating section 1 and adjusted by the operating lever 2 is coupled as a reference element to a digital storage section 26 via an analog-digital converter 17, and the digital storage section 26 is connected to the digital storage section 26 as a reference element. Any one of claims 1 to 2, which is connected to the stopper operation control unit 6 via a digital-to-analog converter 22.
The control device described in . 4. In the case of manual operation, the control device according to any one of claims 1 to 3, wherein the stopper operating device section 6 is connected to the reference elements 4, 32. 5. In the case of manual operation, the control according to claim 4, in which the reference element forming the potentiometer 4 is connected to the stopper operating device section 6 via an analog-to-digital converter 17 and a digital-to-analog converter 22. Device. 6 The logic circuit 1 is connected via the switch 3 of the operation unit 1.
6. The control device according to any one of claims 1 to 5, wherein the control device is configured to send out a starting pulse for the storage unit and the storage unit. 7. According to any one of claims 1 to 6, the reference level for the wear of the stopper 8 is inputted to the adding devices 23, 33 of the switch device section 5 via the adjustment elements 24, 35. control device. 8. The control device according to any one of claims 1 to 7, which uses a digital reference element 32 in the operating section 1. 9 The analog reference element 4 is connected to the analog storage unit 3
4. The control device according to any one of claims 1 to 7, which is connected to the control device. 10. The control device according to any one of claims 1 to 7, wherein a plurality of casting curves for different molds having different suction behaviors are stored in the storage unit.