JPH0128671B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic hot water supply control device for selectively pouring hot water from a melting furnace into a plurality of casting machines.

In conventional casting operations, particularly casting operations using a gravity casting machine, a sand mold is first set in a mold of the gravity casting machine, and then the mold is tilted at an angle that makes it easiest to pour hot water into the sand mold. Here, the worker pours hot water supplied from the melting furnace into the mold using a ladle, then tilts the mold further, and when the hot water in the mold hardens, the worker tilts the mold. Return it and take out the product. After this, a new sand mold is set in the mold again and the process moves on to casting the next product.

As described above, in conventional casting work, workers supply hot water while going back and forth between the melting furnace and the casting machine, which not only poses danger, but also requires approximately one worker per casting machine. There were shortcomings that the workers had to take care of.

Therefore, if there was a device that could automatically pour hot water from a melting furnace into multiple casting machines, the above drawbacks could be solved. Specifically, a conveyance path is provided between a melting furnace and a plurality of casting machines, a water heater is movably provided on this conveyance path, and the operation of this water heater is controlled by, for example, a relay sequence. Therefore, a method can be considered in which hot water from the melting furnace is sequentially poured into each casting machine.

However, this method of pouring hot water into multiple casting machines in a predetermined order poses a problem that cannot be applied, for example, when multiple casting machines are used to cast different products. Ru. This is because when different products are cast using multiple casting machines, the time from pouring the hot water until it hardens is different for each casting machine, so the pouring order cannot be uniformly prescribed in advance.

Furthermore, in a system in which there are multiple casting machines for one melting furnace, the distance from each casting machine to the melting furnace is different, and the amount of molten metal required for each casting machine is also different. As a result, the amount of temperature drop of the hot water drawn from the melting furnace while being transported to each casting machine also differs. In particular, when the amount of hot water is small and the conveyance distance is long, the amount of temperature drop of the hot water is also large, so the temperature often drops below the actually required temperature.

It is an object of the present invention to be able to safely and efficiently pour hot water into a plurality of casting machines, to arbitrarily determine the pouring order according to the cycle of each casting machine, and to be able to pour hot water into a plurality of casting machines while the hot water is being transported. An object of the present invention is to provide an automatic hot water supply control device that reduces the amount of temperature drop.

Therefore, in the present invention, a conveyance path is provided between the melting furnace and the plurality of casting machines, and a hot water supply device that pours hot water supplied from the melting furnace to the plurality of casting machines is moved to this conveyance path. The control means is provided with a start signal generating means for outputting a start signal on the condition that preparation for pouring is completed in each of the casting machines, and a control means. a first storage section that sequentially stores the start signal; and one or more types of temperature drop factor data that affect the temperature drop of the hot water in the ladle when pouring hot water from the melting furnace to each casting machine. The water heater is controlled to sequentially pour hot water from the melting furnace into each casting machine in accordance with the order of the start signals stored in the second storage unit and the first storage unit. With a configuration including means for reading temperature drop factor data regarding the casting machine for pouring molten metal from the second storage section for each pouring operation, and controlling the moving speed of the water heater based on the temperature drop factor data,
This aims to achieve the above objectives. In other words, in the present invention, the pouring order can be arbitrarily determined according to the cycle of each casting machine by pouring the metal in the order in which the preparation for pouring is completed, and the hot water supply device By controlling the moving speed of the hot water, the drop in temperature of the hot water until it reaches each casting machine is reduced.

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

FIG. 1 shows the entire system of this embodiment. In this system, a base 3 is arranged in parallel between one electric melting furnace 1 and a plurality of gravity casting machines 2 ₁ to 2 _o . The melting furnace 1 is provided with a hot water temperature detector 9 that detects the hot water temperature in the furnace from above and provides the hot water temperature data to a controller 8 serving as a control means. As the hot water temperature detector 9,
For example, an optical temperature detector is used. Each of the casting machines 2 ₁ to 2 _o is set at a predetermined inclination angle before and after pouring the metal, with a sand mold set inside the mold. On the other hand, in the vicinity of each of the casting machines 2 ₁ to 2 _o , there is a start button 4 ₁ as a start signal generating means that is operated on condition that pouring preparation is completed, that is, a sand mold is set in the mold. ~4 _o are provided respectively. When the start buttons 4 ₁ to 4 _o are pressed, a start signal is given to the controller 8, respectively. Further, a hot water supply device 6 is movably provided on the upper surface of the base 3 via a guide rail 5 as a conveyance path, and the water heater 6 is provided at a home position P ₀ facing the melting furnace 1. A home position detector 7 is provided which detects the arrival of the water heater 6 and provides a home position signal to the controller 8. Also, this home position P ₀
At the position, a ladle temperature detector 10 is provided which detects the inner and outer surface temperatures of a ladle 29 provided in the water heater 6 when the water heater 6 is in a standby state, and provides the temperature data to the controller 8. The controller 8 has the start button 4
The starting signals given by the operations ₁ to 4 _o are sequentially stored, and the hot water supplied in the melting furnace 1 is sequentially poured into the casting machines 2 ₁ to 2 _o designated according to the stored order. In order to achieve this, the operation of the hot water supply device 6 is controlled based on a predetermined procedure.

FIG. 2 shows a specific structure of the water heater 6. As shown in FIG. In the water heater 6, carriers 11 are slidably mounted on guide rails 5 on both sides of the base 3. The carrier 11 has a rack 12 fixed to the guide rail 5 on one side at its lower part.
A pinion 13 that meshes with the pinion 13 and a travel motor 14 that moves the carrier 11 along the guide rail 5 by rotating the pinion 13 are provided, and the housing 16 is connected to the housing 16 via a support 15 on the upper part. is installed. The housing 16 rotatably supports a rotating shaft 18 rotated by a ladle tilting motor 17 at its upper portion, and a rotating shaft 20 rotated by a link actuating motor 19 at its middle portion. A link mechanism 21 is provided between the rotating shafts 18 and 20. The link mechanism 21 includes first and second arms 22, 2 each having one end rotatably supported by the rotating shaft 18.
3, a third arm 24 having one end rotatably connected to the other end of the first arm 22, and a third arm 24 having one end rotatably connected to the other end of the second arm 23 and the other end. is rotatably connected to one end of the third arm 24, and one end is fixed to the rotating shaft 20 and the other end is rotatable to one end of the fourth arm 25. When the fifth arm 26 is swung by the drive of the link operating motor 19, the other end of the third arm 24 is rotated as shown by the chain line in the figure. It is designed to be displaced through a trajectory.
Further, the third arm 24 is provided with a hot water level detection sensor 27 having, for example, a pair of electrodes arranged in parallel on one side thereof, and the rotating shaft 18 at one end thereof.
A ladle 29 is attached via a support shaft 28 which is connected to the rotary shaft 28 via an interlocking mechanism (not shown) and rotates in synchronization with the rotating shaft 18 . Here, when the melt level of the melting furnace 1 is detected by the melt level detection sensor 27, the drive of the link operation motor 19 is stopped, and then the ladle tilting motor 17 is driven, and the ladle 29 is tilted. It is becoming more and more like this.

On the other hand, a rotary lever 30 is integrally fixed to the rotary shaft 18, and a water flow control device 31 is provided on the housing 16 to abut the rotary lever 30 and stop driving the ladle tilting motor 17. It is provided. The hot water flow control device 31 includes a switch 32 that stops the ladle tilting motor 17 when the rotary lever 30 comes into contact with the rotary lever 30, and a switch 32 that moves the switch 32 forward and backward relative to the rotary lever 30 to control the rotary lever 30. It is composed of a hot water amount control motor 33 that controls the rotation angle, that is, the inclination angle of the ladle 29. Here, when the ladle 29 is tilted at an angle set by the hot water amount control device 31, hot water is poured into the ladle 29 in an amount corresponding to the tilt angle. After this, Ladol 29,
After being raised from the melting surface of the melting furnace 1 in that position by the operation of the link mechanism 21, the hot water is drained and the position is controlled to a horizontal state, and each casting machine 2 ₁ -
At the _2o position, it is turned upward by 90 degrees about the support shaft 28.

FIG. 3 shows a specific circuit configuration of the controller 8. As shown in FIG. In the same figure, CPU (Central
The processing unit 41 is connected to I/O units 43 and 4 via an address bus and a data bus 42.
4. ROM (Read Only Memory) 45 and
A RAM (Random Access Memory) 46 is connected to each. The I/O unit 43 receives a start signal based on the operation of the start buttons ₄₁ to _4o , a home position signal from the home position detector 7, and hot water temperature data Q from the hot water temperature detector 9. , ladle inner and outer surface temperature data θ ₁ , θ ₂ from the ladle temperature detector 10 and a hot water level detection signal from the hot water level detection sensor 27 are respectively input, and a keyboard 47 is connected. From the keyboard 47, each casting machine 2 ₁ ~
Distance data L ₁ -L _o from 2 _o to the melting furnace 1 and data G ₁ -G _o of molten metal required in each of the casting machines 2 ₁ -2 _o are input. In addition, the above I/
The O unit 44 includes the traveling motor 14, the link actuating motor 19, and the ladle tilting motor 17.
In addition to the motor 33 for controlling the amount of hot water, the display 4
8 are connected. The display 48 indicates, for example, the first to third casting machines 2 that perform a pouring operation.
The machine numbers are displayed in order corresponding to ₁ to 2 _o . Further, the ROM 45 stores in advance a sequence program for controlling the driving of the various motors based on input data such as starting signals accompanying the operation of the starting buttons 4 ₁ to 4 _o .

On the other hand, the RAM 46 includes a distance register 4.
9, hot water flow register 50, ladle temperature register 5
1. Hot water temperature register 52, speed command register 5
3. A ranking register 54 as a first storage section, first and second counters 55 and 56, and a timer counter 57 are provided, respectively. The distance data L ₁ to L _o input from the keyboard 47 are input to the distance register 49 from the hot water amount register 50 .
The hot water amount data G ₁ to G _o input from the keyboard 47 are preset respectively. The ladle temperature register 51 and the hot water temperature register 52
Each time the water heater 6 comes to the home position P ₀ , the ladle inner and outer surface temperature data θ ₁ , θ 2 detected by the ladle temperature detector 10 and the temperature data θ 1 and θ ₂ of the hot water temperature detector 9 are calculated. Hot water temperature data Q is newly written. These registers 49, 50, 5
Reference numerals 1 and 52 store so-called temperature drop factors that affect the temperature drop of hot water in the ladle 29, and collectively constitute a second storage section. The speed command register 53 also contains the carrier 1
When moving 1 to the designated casting machine 2 ₁ to 2 _o ,
A plurality of types of speed command data V _A to V _D defining the moving speed of the carrier 11 are stored in advance.
The order register 54 also includes the start button 4.
The activation signals given by the operations ₁ to 4 _o are sequentially encoded and stored. Further, the first counter 55 is preset with a count number corresponding to the normal operating time T during which the ladle 29 pumps up hot water in the melting furnace 1, and the second counter 56 is preset with a count number corresponding to the normal operating time T during which the ladle 29 pumps hot water in the melting furnace 1. The sum of the count number and the count number corresponding to the ladle additional immersion time ΔT obtained by the calculation described later is set.

Next, the operation of this embodiment will be explained.

First, on the keyboard 47, each casting machine 2 ₁
After inputting the distance data L ₁ to _Lo from ~2 _o to the melting furnace 1 in order, the amount data G ₁ to _{Go of} the melt required for each casting machine 2 ₁ to 2 _o is input in order.
Then, the distance data L ₁ to _{L o} are stored in the distance register 49.
Then, the hot water amount data G ₁ to _{G o} are respectively stored in the hot water amount register 50 . On the other hand, in the standby state where the hot water supply device 6 is located at the home position P ₀ , the hot water temperature data Q of the melting furnace 1 detected by the hot water temperature detector 9 is stored in the hot water temperature register 52 and the hot water temperature data Q detected by the ladle temperature detector 10 is stored in the hot water temperature register 52 . The inner and outer surface temperature data θ ₁ and θ ₂ of the empty ladle 29 are respectively written into the ladle temperature register 51. Here, pouring preparation work is performed in each of the casting machines 2 ₁ to 2 _o . This pouring preparation work begins by setting the sand mold inside the mold, and then pressing the start buttons 4 ₁ to 4 _o.
Press , then tilt the mold to the angle that makes it easiest to pour hot water.

For example, if the start button 4 ₁ is pressed first, the start button 4 ₃ is pressed second, and the start button 4 ₂ is pressed third, the CPU 41 outputs the activation signals in the order in which they were pressed.
This is stored in the ranking register 54 of the RAM 46, and the machine numbers of the casting machines ₂₁ to _2o corresponding to the ranking stored in the ranking register 54 are displayed on the display 48.
After that, the CPU 41 reads out the first starting signal stored in the ranking register 54, determines which casting machine 2 ₁ to 2 _o it is the starting signal from, and based on the determination result, first starts the ladle. After calculating the immersion time for immersing the motor 29 in the hot water of the melting furnace 1 according to the flowchart in FIG.
4. Control the link actuating motor 19, the ladle tilting motor 17, and the molten metal volume control motor 33 in a predetermined order to pour molten metal into the casting machines ₂₁ to _2o .

Here, since the first starting signal is from the casting machine 2 ₁ , the CPU 41 first starts the casting machine 2 ₁ .
Distance data L ₁ and hot water amount data G ₁ corresponding to are read from the distance register 49 and hot water amount register 50, respectively, and ladle inner and outer surface temperature data θ ₁ ,
θ ₂ and hot water temperature data Q to ladle temperature register 5
1. After reading out the hot water temperature register 52, the moving speed V _x of the carrier 11 is selected from the speed command register 53 based on these data L ₁ , G ₁ , θ ₁ , θ ₂ , and Q. Subsequently, based on the speed data V _x and the data L ₁ , G ₁ , θ ₁ , θ ₂ , Q, the water heater 6 arrives at the casting machine 2 ₁ and supplies the hot water in the ladle 29 to the casting machine 2 ₁ . After calculating the temperature drop amount ΔQ of the temperature of the hot water in the ladle 29 until the hot water is poured, the additional immersion time ΔT of the ladle corresponding to the ΔQ is determined. Incidentally, when calculating the additional immersion time ΔT of the ladle, a table may be provided in advance in which ΔQ and ΔT are correlated. Here, the count number corresponding to ΔT is added to the value of the first counter 55, that is, the count number of the normal operating time T during which the ladle 29 pumps hot water in the melting furnace 1, and the total value is added to the count number of the normal operation time T during which the ladle 29 pumps hot water in the melting furnace 1, and the total value is calculated as the second counter 56. After setting, drive commands are given to various motors according to predetermined procedures.

First, while the hot water supply device 6 is waiting at the home position _P0 , that is, the position facing the melting furnace 1, a drive command is given to the link actuation motor 19, and the ladle 29 is melted through the operation of the link mechanism 21. It is lowered towards the furnace 1. While the ladle 29 is descending toward the melting furnace 1, the hot water level detection sensor 27
When the water reaches the hot water level, a detection signal from the hot water level detection sensor 27 is given to the CPU 41. Then,
After stopping the link operation motor 19, that is, stopping the lowering of the ladle 29, the CPU 41 reads out the hot water amount data _G1 of the casting machine ₂₁ from the hot water amount register 50, and controls the hot water amount control motor 33 based on the hot water amount data _G1 . At the same time, the ladle tilting motor 17 is driven to tilt the ladle 29 at a predetermined angle. On the other hand, after receiving the detection signal from the hot water level detection sensor 27, the CPU 41 counts up the timer counter 57 at regular intervals, and determines whether the value of the timer counter 57 reaches the value of the second counter 56 or not. Decide whether or not. Here, when the value of the timer counter 57 reaches the value of the second counter 56, that is, after the ladle 29 is immersed in hot water, T+
After the ΔT time has elapsed, the CPU 41 gives a drive command to the link actuation motor 19 to move the ladle 29 to the second position.
The carrier 11 is returned to the center position in the figure, that is, the upper position of the carrier 11. Therefore, the ladle 29 is determined based on the distance L ₁ from the melting furnace 1 to the pouring casting machine 2 ₁ , the amount of molten metal G ₁ to be transferred, the ladle inner and outer surface temperatures θ ₁ , θ ₂ , the amount of molten metal Q, etc.
Since the immersion time is controlled, the amount of temperature drop until the ladle 29 reaches the casting machine 2 ₁ can be reduced. Incidentally, when the ladle 29 is raised from the melting furnace 1, after being raised from the melt level in an inclined position,
Attitude is controlled to horizontal state. This allows Ladle 2
The amount of hot water corresponding to the inclination angle of 9, that is, the amount of hot water required for the casting machine ₂₁ is supplied to the ladle 29.

Next, a drive command is given to the traveling motor 14,
The carrier 11 is moved from the home position P ₀ to the position P ₁ of the casting machine 2 ₁ at a speed based on the speed data Vx selected from the speed command register 53 and stopped. Further, while the carrier 11 is stopped at the position P ₁ , a drive command is given to the link actuation motor 19 to advance the ladle 29 toward the casting machine 2 ₁ through the operation of the link mechanism 21 . Then, when the ladle 29 reaches the casting machine ₂₁ , a drive command is given to the ladle tilting motor 17,
After the ladle 29 is turned 90 degrees counterclockwise in FIG. 2 and the hot water in the ladle 29 is poured into the casting machine ₂₁ , the ladle 29 is returned to a horizontal state. After that, after returning the ladle 29 to the position above the carrier 11, a drive command is given to the travel motor 14, and the carrier 11 is returned to the home position _P0 to complete pouring into the casting machine ₂₁ . .

Next, when the carrier 11 returns to the home position _P0 and the home position signal is given to the CPU 41 from the home position detector 7, the CPU
41 sequentially shifts the data in the order register 54, reads out the first data, that is, the second input data, and determines which casting machine 2 ₁ to 2 _o the starting signal is from. In this case, since the data is from casting machine 2 ₃ , CPU 4
1, first calculates the additional immersion time ΔT of the ladle 29 based on the casting machine ₂₃ , and then operates the driving motor 14,
Link actuation motor 19, ladle tilting motor 1
7 and the motor 33 for controlling the amount of hot water, the hot water from the melting furnace 1 is poured into the casting machine ₂₃ . In this way, according to the data stored in the order register 54, metal is selectively poured into each of the casting machines 2 ₁ to 2 _o .

On the other hand, in each of the casting machines ₂₁ to _2o , when the poured molten metal hardens and the product is completed, the worker takes out the product, sets a new sand mold in the mold again, and then presses the start button. 4 ₁ - 4 Press _o . Then, the data corresponding to the pressed startup buttons 4 ₁ to 4 _o is stored in the RAM 46.
According to the order of the data stored in the order register 54,
Molten metal is selectively poured into each of the casting machines 2 ₁ to 2 _o .

Therefore, in this embodiment, each of the casting machines 2 ₁ to 2 _o pours molten metal in order from the one that is ready for pouring, so that, for example, each of the casting machines 2 ₁ to 2 _o casts a different product. Even in such a case, the pouring can be carried out efficiently, and the required amount of hot metal can be poured in each of the casting machines 2 ₁ to 2 _o .

In addition, each casting machine 2 ₁ to which melting metal is poured from the melting furnace 1
After the moving speed of the carrier 11 is selected based on the distance to 2 _o , the amount of hot metal to be transferred, the temperature of the inner and outer surfaces of the ladle, and the hot water temperature, the additional immersion time of the ladle 29 is determined including the moving speed. The drop in temperature of the hot water in the ladle 29 during transfer from 1 to each of the casting machines 2 ₁ to 2 _o can be reduced. Furthermore, since the hot water supply device 6 automatically performs the pouring work from the melting furnace 1 to each of the casting machines 2 ₁ to 2 _o , work safety can be ensured and labor savings can be expected.

In addition, in the above embodiment, a plurality of casting machines 2 ₁ to
2 _o , but the present invention is directed to at least two or more casting machines. In addition to the start buttons ₄₁ to _4o described in the above embodiments, the start signal generating means includes, for example, a means that automatically detects when a sand mold is set in each casting machine and outputs a pouring command signal. It may be something that does. Furthermore, the control means is not limited to the circuit described in the above embodiment.

In addition, in the above embodiment, as temperature drop factor data, each casting machine 2 ₁ to 2 _o into which melt is poured from the melting furnace 1 is used.
The moving speed of the carrier 11 is determined by taking into account the distance to
The additional immersion time was calculated, but the temperature drop factor data may be only the distance or the amount of hot water.
Additionally, atmospheric temperature may be included.

As described above, according to the present invention, it is possible to safely and efficiently pour hot water into multiple casting machines, thereby saving labor, and at the same time, the order of pouring hot water can be determined according to the cycle of each casting machine. Therefore, it can be applied even when each casting machine casts a different product, and since the moving speed of the water heater is controlled for each casting machine, the temperature of the hot water until it reaches each casting machine can be controlled. The drop can be reduced.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, and Fig. 1 is an explanatory diagram showing the entire system, Fig. 2 is a side view showing the water heater, Fig. 3 is a block diagram showing the controller, and Fig. 4 is an explanatory diagram showing the entire system. This is a flowchart for determining the soaking time of the ladle. 1... Melting furnace, 2 ₁ ~ 2 _o ... Casting machine, 4 ₁ ~ 4 _o
...Start button as a start signal generating means, 5...Guide rail as a conveyance path, 6...Water heater, 8...
...Controller as control means, 41...
CPU, 49... Distance register, 50... Hot water amount register, 51... Ladle temperature register, 54...
rank register.

Claims (1)

[Scope of Claims] 1. A melting furnace, a plurality of casting machines, a conveyance path disposed between the plurality of casting machines and the melting furnace, and a conveyance path provided movably along the conveyance path. a hot water supply device having a ladle for pumping up hot water from the melting furnace and pouring it into the plurality of casting machines; and a start signal generator for outputting a start signal on condition that preparation for pouring the hot water in each of the casting machines is completed. and a control means for controlling the operation of the hot water supply apparatus based on the activation signals from each of the activation signal generation means, and the control means includes a controller for sequentially storing activation signals from each of the activation signal generation means. and a second storage unit that stores one or more types of temperature drop factor data that affect the temperature drop of the hot water in the ladle until the hot water is poured from the melting furnace to each casting machine.
controlling a water heater to sequentially pour hot water from the melting furnace into each casting machine in accordance with the order of the start signals stored in the storage unit and the first storage unit;
reading out temperature drop factor data regarding the casting machine for pouring metal for each pouring operation from the second storage unit;
An automatic hot water supply control device comprising means for controlling the moving speed of the hot water supply device based on the temperature drop factor data. 2. The automatic hot water supply control device according to claim 1, wherein the second storage section stores distance data to the melting furnace for each of the casting machines as the temperature drop factor data. 3. The automatic hot water supply control according to claim 1, wherein the second storage unit stores data on the amount of hot water supplied to each ladle for each of the casting machines as the temperature drop factor data. Device. 4. In claim 1, the second storage unit stores distance data to the melting furnace and data on the amount of hot water supplied to the ladle for each of the casting machines as the temperature drop factor data. Features an automatic hot water supply control device. 5. In claim 1, the second storage unit stores, as the temperature drop factor data, distance data to the melting furnace and data on the amount of hot water supplied to the ladle for each casting machine, and
An automatic hot water supply control device characterized by storing temperature data of a ladle.