JPH0638612Y2 - Hot water supply device for pouring furnace - Google Patents

Description

[Detailed Description of the Invention] A. Purpose of the Invention (1) Field of Industrial Application The present invention relates to a hot water supply apparatus for supplying the molten metal from the melting furnace to the pouring furnace.

(2) Conventional Technology Conventionally, such a device is known from, for example, Japanese Utility Model Laid-Open No. 56-6562.

(3) Problems to be Solved by the Invention In the above-mentioned conventional apparatus, the molten metal is directly supplied from the melting furnace to the pouring furnace through the gutter. By the way, the conditions of the molten metal discharged from the melting furnace are often different for each molten metal, and generally the molten metal from the melting furnace is held in a holding furnace as disclosed in Japanese Utility Model Publication No. 53-29714. By doing so, the molten metal conditions are stabilized.

However, in the conventional one, when a predetermined amount of molten metal is poured into the ladle due to the tilting of the holding furnace, the holding furnace is made uniform regardless of the tilt angle (and therefore the amount of molten metal held in the holding furnace). In this case, if the tilt angle is large (therefore, the amount of molten metal held in the holding furnace is relatively small), the reciprocating tilt amount of the holding furnace becomes larger than necessary. There is a problem of inefficiency. Further, when the amount of molten metal held in the holding furnace is excessively reduced during the process of pouring into the ladle, there is a risk that the heating means for heating the molten metal in the holding furnace will malfunction due to the insufficient amount of molten metal. there were.

The present invention can solve all the above problems of the conventional device. It is an object to provide a hot water supply device for a pouring furnace.

B. Configuration of the Invention (1) Means for Solving the Problems In order to achieve the above object, the present invention provides a tilting support for a holding furnace for temporarily holding the molten metal from the melting furnace. At the same time, the holding furnace is provided with heating means for heating the molten metal in the furnace, and a ladle for receiving the molten metal from the holding furnace when the holding furnace is tilted is arranged on one side of the holding furnace. In a hot water supply device for pouring a pouring furnace into a pouring furnace, a cylinder which is interposed between the base and the holding furnace and tilts and drives the holding furnace; And a holding furnace interposed between the holding furnace and the holding furnace, and the holding furnace has a substantially horizontal original position, a preliminary original position tilted by a predetermined angle from the original position, a molten metal under-prediction position tilted by a predetermined angle from the preliminary original position, and Check that the position is below the molten metal low warning position, which is tilted by a predetermined angle from the molten metal low warning position. Tilting position detecting means capable of detecting each, and when the holding furnace has not yet reached the molten metal under-predicted position when a predetermined amount of molten metal is poured into the ladle, the holding furnace is moved to the original position. When the molten metal under-predicted position is reached, the holding furnace is moved back to the preliminary original position, and further, before the amount of molten metal in the ladle reaches a predetermined value, the holding furnace is under molten alarm warning position. Control means for controlling the operation of the cylinder on the basis of a detection signal of the tilt position detection means so that the holding furnace is returned to the original position when the temperature reaches.

(2) Operation According to the above configuration, the holding furnace can be easily and accurately tilt-controlled by simply supplying and discharging the working fluid to and from the cylinder.

Also, especially when the holding furnace has not yet reached the molten metal under-predicted position when a predetermined amount of molten metal is poured into the ladle due to the tilting of the holding furnace, the holding furnace is returned to the original position, and the molten metal under-predicted position. When the holding furnace is reached to the original position, the holding furnace is moved back to the original position. Therefore, the tilting angle of the holding furnace when the molten metal of a predetermined amount is poured into the ladle (hence the inside of the holding furnace) The amount of backward movement can be automatically changed according to the magnitude of the amount of molten metal held), and the required amount of tilting when tilting the holding furnace again thereafter can be minimized. Moreover, if the amount of molten metal held in the holding furnace is excessively reduced and the holding furnace reaches the molten metal low alarm position, immediately return the holding furnace to the original position even while pouring the molten metal into the ladle. Therefore, it is possible to prevent the heating means from malfunctioning due to an insufficient amount of molten metal.

(3) Embodiment Hereinafter, one embodiment of the present invention will be described with reference to the drawings. First, in FIG. 1, this hot water supply device is a tilting holding furnace 1 and a holding furnace 1 capable of holding molten metal from a melting furnace (not shown). A ladle 3 for receiving the molten metal from the holding furnace 1 and a ladle 3 for receiving the molten metal flowing out from the gutter 2, and the ladle 3 is a pressurizing type automatic pouring device for automatically pouring the molten metal into a mold (not shown). Four
It is possible to supply hot water to the pouring furnace 5.

Referring also to FIG. 2, the holding furnace 1 is tiltably disposed on a traveling carriage 7 as a base that can travel on the rails 6. That is, a column 8 is erected on the traveling carriage 7, and the holding furnace 1 is tiltably supported above the column 8 via a horizontal support shaft 9 in the vicinity of the outlet 1a. Further, a pair of cylinders 10, 10 as tilting drive means are provided between the traveling carriage 7 and the holding furnace 1, and both cylinders 10, 10 and the support column 8 are arranged so as to be at respective vertex positions of a triangle. To be done. Thus, both cylinders 10 and 10 operate synchronously, and depending on the expansion and contraction operation of the cylinders 10 and 10,
The holding furnace 1 tilts around the outlet 1a as a fulcrum.

In the lower part of the holding furnace 1, an inductor 11 is attached as a heating means for heating the molten metal while circulating the molten metal with the inside of the holding furnace 1 to avoid a decrease in the temperature of the molten metal in the holding furnace 1. The inductor 11 extends diagonally downward from the lower part of the holding furnace 1 between both cylinders 10, 10.

Between the traveling carriage 7 and the holding furnace 1, there is provided a tilt detector 12 as tilt position detecting means for detecting the tilt degree of the holding furnace 1 in four stages, for example. The tilt detector 12 includes four limit switches L1, L2, L3, L4 that are mounted vertically on a mounting plate 13 that is erected on the traveling carriage 7,
The holding rod 1 is attached to a lower portion of the holding furnace 1 so as to be sequentially detected by the limit switches L1 to L4 according to the tilting of the holding furnace 1.

The inclination detector 12 can detect the degree of inclination of the holding furnace 1 in four stages as shown in FIG. That is, the limit switch L1 detects a state in which the holding furnace 1 is substantially horizontal as shown in FIG. 3 (a), and the limit switch L4 has a maximum holding furnace 1 as shown in FIG. 3 (d). It detects a state of tilting upwards. Further, the limit switch L2 is for detecting the state in which the holding furnace 1 is tilted slightly upward from its horizontal posture as shown in FIG. 3 (b), and the limit switch L3 is as shown in FIG. 3 (c). In addition, the state immediately before the holding furnace 1 tilts up to the maximum is detected. Here, the position of the holding furnace 1 detected by the limit switch L1 is the original position, the position of the holding furnace 1 detected by the limit switch L2 is the preliminary original position, and the limit switch
The position of the holding furnace 1 detected by L3 is called the molten metal under-predicted position, and the position of the holding furnace 1 detected by the limit switch L4 is called the molten metal under-warning position.

In FIG. 1 again, the rail 6 is laid so as to allow the traveling carriage 7 to travel between the melting furnace (not shown) and the automatic pouring device 4 in the fixed position, and the gutter 2 is
It is fixedly arranged at a position corresponding to the automatic pouring device 4 so as to receive the molten metal discharged from the outlet 1a of the holding furnace 1. That is, the gutter 2 which is inclined with the holding furnace 1 side higher and the automatic pouring device 4 side lower is fixed on a gantry 15 erected on the floor.

In addition, the holding furnace 1 stopped at a position corresponding to the gutter 2
A molten metal detection sensor 16 for detecting the molten metal flowing out from the outlet 1a is fixedly disposed above the outlet 1a in order to add an inoculant to the molten metal flowing from the outlet 1a into the gutter 2. The inoculation device 17 is fixedly arranged.

The ladle 3 that receives the molten metal from the gutter 2 can reciprocate between the position below the outlet of the gutter 2 and the automatic pouring device 4, and can supply the molten metal to the pouring furnace 5 of the automatic pouring device 4. . That is, a rail 19 is provided between the position below the outlet of the gutter 2 and the automatic pouring device 4, and a lift mechanism 21 and a tilting mechanism 22 are provided on a carriage 20 that can travel along the rail 19. A ladle 3 is provided. Thus, the carriage 20
As shown by the solid line in FIG. 1, the lift mechanism 21 and the tilting mechanism 22 maintain the horizontal position of the ladle 3 at the lower position so as to receive the molten metal flowing out from the gutter 2. When the carrier 20 moves to the automatic pouring device 4 side after a predetermined amount of molten metal has flowed into the ladle 3, the lift mechanism 21 and the tilting mechanism 22 are shown by the chain line in FIG. Thus, the ladle 3 is raised and tilted to supply the molten metal in the ladle 3 to the pouring furnace 5 of the automatic pouring device 4.

In order to detect the amount of molten metal in the ladle 3, a load cell 23 as a weight detector for detecting the weight of the carrier 20 when the position is below the outlet of the gutter 2 is arranged below the rail 19. Further, a molten metal detection rod 24 for detecting the upper surface of the molten metal in the ladle 3 is provided at a fixed position so as to be vertically movable while being located at a position below the outlet of the gutter 2.

The automatic pouring device 4 is made up of a pouring furnace 5 supported by a supporting base 25, and the supporting base 25 is arranged on the floor via a load cell 26 as a weight detector. Therefore, pouring furnace 5
The amount of molten metal inside can be detected by the load cell 26.

In FIG. 4, the operation of the cylinders 10, 10 for tilting the holding furnace 1 is controlled by a control means 27 composed of a computer, and the control means 27 includes a tilt detector 12 and molten metal detection. The detection values of the sensor 16, the molten metal detection rod 24, and the load cells 23, 26 are input.

Both cylinders 10 and 10 extend when the hydraulic pressure is supplied to tilt the holding furnace 1. When the hydraulic pressure is released, the holding furnace 1 is tilted.
Both cylinders 10 and 10 contract due to the weight of the holding furnace 1 and the holding furnace 1 returns to the original position side by its own weight. Thus, the downstream ends of the oil passages 30 are connected in parallel to the hydraulic chambers 10a, 10a of both cylinders 10, 10. The oil passage 30 is provided with a pilot type check valve 31, a hydraulic pressure supply variable throttle valve 32 and a hydraulic pressure release variable throttle valve 33 in this order from the upstream side thereof. A check valve 34 that allows only the flow of the hydraulic oil from the cylinders 10, 10 is connected in parallel, and the hydraulic release variable throttle valve 33 allows only the flow of the hydraulic oil toward the cylinders 10, 10. The check valve 35 is connected in parallel. The pilot-type check valve 31 allows only the flow of hydraulic oil toward both cylinders 10, 10 when the oil pressure in the pilot oil passage 36 is low, but does not allow both cylinders 10 to flow when the oil pressure in the pilot oil passage 36 is high. It also allows the flow of hydraulic oil from 10 and 10. The hydraulic supply variable throttle valve 32 is driven by an actuator 37 to change the throttle amount. Since the check valve 34 is connected in parallel with the hydraulic supply variable throttle valve 32, both cylinders 10, 10 The amount of hydraulic oil supplied to the valve is adjusted by the hydraulic supply variable throttle valve 32. Further, the hydraulic release variable throttle valve 33 is driven by an actuator 38 to change the throttle amount.
Check cylinder 35 is connected in parallel with 33, so both cylinders 1
The amount of hydraulic oil flowing out from 0, 10 is the variable throttle valve for releasing the hydraulic pressure.
It will be adjusted by 33.

A supply oil passage 40 is connected to the discharge port of the hydraulic pump 39, and a release oil passage 42 is connected to the oil tank 41. A switching control valve 43 is provided between the supply oil passage 40 and the release oil passage 42 and the oil passage 30 and the pilot oil passage 36. The switching control valve 43 connects the supply oil passage 40 to the oil passage 30 and the release oil passage 42 to the pilot oil passage 36 at the left position, and connects the oil passage 30 and the pilot oil passage 36 to the release oil passage 42. It is possible to switch between a neutral position for making the oil passage 30 communicate with the release oil passage 42 and a right position for making the pilot oil passage 36 communicate with the supply oil passage 40 by exciting and deactivating solenoids 43a, 43b, and the left side. At the position, hydraulic oil is supplied to the hydraulic chamber 10a, respectively, and the cylinders 10, 10 are extended, and at the neutral position, the hydraulic oil is blocked by the pilot check valve 31 in response to the hydraulic pressure release of the pilot oil passage 36. Therefore, the operating state of the cylinders 10, 10 is maintained, and further, in the right position, the hydraulic oil in the pilot oil passage 36 becomes higher, so that the pilot type check valve 31 allows the hydraulic oil to flow out. Contracts.

The control means 27 controls the solenoids 43a, 43b in the actuators 37, 38 and the switching control valve 43 according to the detection values of the tilt detector 12, the molten metal detection sensor 16, the molten metal detection rod 24, and the load cells 23, 26. , Thereby cylinder 1
The operating amounts and operating speeds of 0 and 10, that is, the tilting amount and the tilting speed of the holding furnace 1 are controlled.

By the way, in the control means 27, the control procedure as shown in FIG. 5 is preset. That is, in the first step S1, it is confirmed whether or not a hot water receiving command for the pouring furnace 5 is issued. This is to confirm whether or not the amount of molten metal in the pouring furnace 5 detected by the load cell 26 is below a certain value. When the amount of molten metal in the pouring furnace 5 is below a certain value, the second step S2 Proceed to. In the second step S2, whether or not the carrier 20 is in the original position, that is, whether or not the ladle 3 is located below the outlet of the gutter 2 is confirmed by a signal from a limit switch (not shown) or the like. When the carriage 20 is in the original position, the process proceeds to the third step S3,
When it is not in the original position, the process returns to the first step S1.

In the third step S3, the holding furnace 1 is tilted at high speed. That is, the switching control valve 43 is set to the left position, the throttle degree of the hydraulic supply variable throttle valve 32 is reduced to supply a relatively large amount of hydraulic oil to the cylinders 10, 10, and the cylinders 10, 10 are extended at high speed. Let Next, in the fourth step S4, it is confirmed that tapping from the holding furnace 1 has started. That is, it is confirmed by the signal from the molten metal detection sensor 16 that the molten metal is flowing out from the outlet 1a of the holding furnace 1, and the load cell 23 confirms that the molten metal has entered the ladle 3.

After the confirmation in the fourth step S4, in the fifth step S5, the tilting operation of the holding furnace 1 is stopped by setting the switching control valve 43 to the neutral position, and the stopped state is maintained for 10 seconds, for example. Then, the tilting movement of the holding furnace 1 is started. That is, the switching control valve 43 is set to the left position, the throttle degree of the hydraulic pressure supply variable throttle valve 32 is increased, and the amount of hydraulic fluid supplied is throttled to slowly extend the cylinders 10, 10. At the following seventh step S7, it is confirmed whether or not the amount of molten metal in the holding furnace 1 becomes excessively small when the holding furnace 1 tilts at a slight speed. That is, it is confirmed in a seventh step S7 whether or not the limit switch L4 in the tilt detector 12 does not detect the detection rod 14. When the amount of molten metal in the holding furnace 1 exceeds the predetermined value, the process proceeds to the eighth step S8, and when it is below the predetermined value, the process proceeds to the fourteenth step S14.

In the eighth step S8, it is confirmed by the molten metal detection rod 24 whether the molten metal is likely to overflow from the ladle 3.
If the overflow is not likely to occur, the procedure proceeds to the twelfth step 11, but if the overflow is likely to occur, the procedure proceeds to the ninth step S9. In the ninth step S9, the switching control valve 43 is set to the right position, the hydraulic chambers 10a, 10a of the cylinders 10, 10 are released, the holding furnace 1 is returned by its own weight, and tapping from the holding furnace 1 to the ladle 3 is stopped. . Further, when it is confirmed by the limit switch L1 of the inclination detector 12 that the holding furnace 1 has returned to the original position in the tenth step S10, the switching control valve 43 is set to the neutral position and the returning movement of the holding furnace 1 is stopped. No. 11 of the traveling carriage 20
Stop in step S11.

In the twelfth step S12, the slow tilting of the holding furnace 1 is temporarily stopped, and in the following thirteenth step S13, the load cell 23 detects whether or not a sufficient amount of molten metal has entered the ladle 3. When a sufficient amount of molten metal is not yet in the ladle 3, the process returns to the sixth step S6, and when a sufficient amount of molten metal is in the ladle 2, the process proceeds to the 14th step S14.

In the fourteenth step S14, the returning operation of the holding furnace 1 is started, and in the fifteenth step S15, whether or not the detection rod 14 is detected by the limit switch L3 in the inclination detector 12, that is, the holding furnace 1 is set to the molten metal underpredicted position. To see if When the molten metal under-prediction state is not detected in the fifteenth step S15, the returning movement of the holding furnace 1 is stopped at the original position in the sixteenth step S16, and then the movement of the carrier vehicle 20 is started in the seventeenth step S17 and the ladle 3 is moved to the automatic pouring device 4 side to supply the molten metal in the ladle 3 to the pouring furnace 5.

Further, when the molten metal under-predicted state is detected in the fifteenth step S15, the returning operation of the holding furnace 1 is stopped in the preliminary home position in the eighteenth step S18, and further in the nineteenth step S19 in the ladle 3 as in the seventeenth step S17. Supply of the molten metal to the pouring furnace 5 is started. Further, in the twentieth step S20, it is confirmed whether or not it is detected in the seventh step S7 that the amount of the molten metal in the holding furnace 1 is too small. If the amount of the molten metal is not too small, the automatic operation is continued and the amount is too small. If so, one cycle of automatic operation is stopped in the 21st step S21.

Next, the operation of this embodiment will be described. When supplying the molten metal received from the melting furnace to the pouring furnace 5 from the holding furnace 1, first, the ladle 3 is located below the outlet of the gutter 2. After confirming, check that the holding furnace 1 is tilted and the outlet 1a
The molten metal is poured into the ladle 3 through the gutter 2. Moreover, the holding furnace 1 is tilted at a high speed for shortening the time until it is confirmed that hot water is discharged from the holding furnace 1.

When it is confirmed that the molten metal is discharged from the holding furnace 1, the holding furnace 1 stops its tilting motion for, for example, about 10 seconds, and then the holding furnace 1 is brought into an inching tilting state in which a slow tilting and a stop are repeated. That is, the molten metal from the holding furnace 1 is ladle 3
The molten metal is poured from the holding furnace 1 into the ladle 3 while monitoring so as not to overflow from the ladle 3. During this time, the inoculant is added from the inoculator 17 to the molten metal.

When a predetermined amount of molten metal has been poured into the ladle 3, the holding furnace 1 starts a backward movement to stop the molten metal from the outlet 1a,
Further, the ladle 3 starts pouring operation into the pouring furnace 5. When the holding furnace 1 is not tilted to the molten metal under-predicted position at the time of pouring the molten metal into the ladle 3, the holding furnace 1 returns to the original position,
When the molten metal under-predicted position has been reached, the holding furnace 1 returns to the preliminary original position. By doing so, when pouring the ladle 3 in the next cycle, the time until the pouring from the holding furnace 1 is started can be shortened as much as possible. That is, when pouring into the ladle 3, tilting to the molten metal under-predicted position indicates that the amount of molten metal in the holding furnace 1 has decreased. When returning to the original position, the time for the holding furnace 1 to tilt from the original position to the position for starting the pouring becomes longer when pouring is started again. I try not to return it to its original position.

By the way, when pouring the molten metal from the holding furnace 1 into the ladle 3, the holding furnace 1 may reach the molten metal insufficient alarm position before the amount of molten metal in the ladle 3 reaches a predetermined value. In this case, the holding furnace 1 is moved back to the original position, the pouring operation of the ladle 3 into the pouring furnace 5 is started, and then the automatic operation is stopped. That is, the ladle 3 is moved to the automatic pouring device 4 side, lifted by the lift mechanism 21, hot water is supplied to the pouring furnace 5 according to tilting by the tilting mechanism 22, returning to a horizontal position after completion of hot water supply, and descending. After the operation of one cycle consisting of the operation and the return of the gutter 2 to the lower position of the outlet, it is automatically stopped. This prevents failure of the inductor 11 due to an excessively small amount of molten metal in the inductor 11.

In addition, when pouring molten metal from the holding furnace 1 into the ladle 3, the amount of molten metal in the ladle 3 may increase and overflow may occur. In this case, the holding furnace 1 is returned to the original position to stop the tapping, and the operation of the ladle 3 is also stopped. This is to prevent burnout of the apparatus due to overflow of the molten metal from the ladle 3.

C. Effect of the Invention As described above, according to the present invention, since the holding furnace is tilted and driven by the cylinder, the tilting control of the holding furnace can be simply and accurately controlled by simply supplying and discharging the working fluid to and from the cylinder. it can.

In particular, the holding furnace is in a substantially horizontal original position, a preliminary original position tilted from the original position by a predetermined angle, a molten metal under-predicted position tilted by a predetermined angle further than the preliminary original position, and a predetermined angle more than the molten metal under-predicted position. The tilting position detection means that can detect each of the tilted molten metal insufficient alarm position is used, and when the predetermined amount of molten metal is poured into the ladle due to the tilting of the holding furnace, If the holding furnace is not reached, the holding furnace is returned to the original position, and if it is reached to the molten metal under-prediction position, the holding furnace is returned to the preliminary original position. The tilting angle of the holding furnace when molten metal is poured (hence the amount of molten metal held in the holding furnace) is automatically changed according to the amount of tilting, and then the tilting required when tilting the holding furnace again Minimize the amount It can, therefore be able to contribute greatly to the improvement of the pouring efficiency. Moreover, when the amount of molten metal held in the holding furnace is excessively reduced and the holding furnace reaches the molten metal low alarm position, the holding furnace can be immediately reactivated even while pouring into the ladle. It is possible to prevent the heating means for heating the molten metal in the holding furnace from malfunctioning due to an insufficient amount of molten metal.

[Brief description of drawings]

The drawing shows an embodiment of the present invention, and FIG.
An overall side view, FIG. 2 is an enlarged front view of the holding furnace viewed from the line II-II in FIG. 1, FIG. 3 is a view showing the tilted state of the holding furnace, and FIG. 4 is for controlling the tilt drive means. FIG. 5 is a flow chart showing the control procedure of the control means. DESCRIPTION OF SYMBOLS 1 ... Holding furnace, 1a ... Outflow port, 2 ... Gutter, 3 ... Ladle, 5 ... Pouring furnace, 7 ... Traveling vehicle as a base, 10 ... Cylinder, 12 ... Tilt detector as tilt position detection means, 23, 26 ... Load cell as weight detector, 27 ... Control means

Claims (1)

[Scope of utility model registration request] 1. A holding furnace (1) for temporarily holding a molten metal from a melting furnace is tiltably supported on a base (7), and the holding furnace (1) is connected to the inside of the furnace. A heating means (11) for heating the molten metal is provided, and a ladle (3) for receiving the molten metal from the holding furnace (1) when the holding furnace (1) is tilted is arranged on one side of the holding furnace (1). A hot water supply apparatus for pouring a pouring furnace (5) from a ladle (3), which is interposed between the base (7) and the holding furnace (1). A cylinder (10) that tilts and drives the holding furnace (1), and the holding furnace (1) is also interposed between the base (7) and the holding furnace (1), and the holding furnace (1) is at a substantially horizontal original position. A preliminary original position tilted by a predetermined angle from the position, a molten metal under-predicted position tilted by a predetermined angle further than the preliminary original position, and a predetermined angle tilted by more than the molten metal under-predicted position The tilt position detecting means (12) capable of detecting the presence of the molten metal insufficient alarm position, respectively, and the holding furnace (1) is still under molten metal when a predetermined amount of molten metal is poured into the ladle (3). When the predicted furnace position has not been reached, the holding furnace (1) is returned to the original position, and when the molten metal under-predicted position has been reached, the holding furnace (1) is returned to the preliminary original position. When the holding furnace (1) reaches the molten metal low alarm position before the amount of molten metal in the ladle (3) reaches a predetermined value, the holding furnace (1) is returned to the original position. A hot water supply apparatus comprising: a control means (27) for controlling the operation of the cylinder (10) based on a detection signal of the tilt position detection means (12).