JPS58181461A - Method and device for conveying ladle for automatic charging - Google Patents

Abstract

PURPOSE:To eliminate the time loss of a conveying cycle and to improve the efficiency of charging work by changing the speed changing position above the molten metal where the conveying speed of a ladle is changed from a high to low speed in accordance with the change in the melt surface in a furnace body. CONSTITUTION:A ladle 50 is conveyed at a high speed along a conveyance path P from a charging position P2 to the 3rd speed changing position P3 with an operation transmission mechanism 40 having the 1st, the 2nd arms 60, 70, etc. by the reverse rotating and driving of a conveyance motor 30 upon ending of charging. the above-mentioned position P5 is set after the change in the melt surface owing to ladling up of the molten metal in a furnace body 170 is corrected with the previous position. The motor 30 runs reverse at a low speed from the position P5 up to the melt surface. When the ladle 50 arrives at the melt surface, the motor 30 is stopped by the signal of a melt surface detector 160, and the molten metal is ladled up by the driving of a tilting motor 150, whereafter the ladle 50 is conveyed at a low speed between the ladling position P1-the 2nd speed changing position P4 and at a high speed up to the 1st speed changing position P3 then at a low speed up to the charging position P2 by the forward rotating and driving of the motor 30.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method and apparatus for conveying a ladle for automatic hot water supply;
%, it relates to a method and apparatus for conveying a ladle that are effective for automatic hot water supply to a die-casting machine.

Conventionally, as shown in FIG. 1 and FIG.
The ladle 4 is connected to the pouring machine mechanism 3 via 7, and the molten metal is changed from the pouring level fti'+ to the speed switching position - according to the rotational movement of the carry-in drive shaft 2.
The ladle is reciprocated along a predetermined conveyance path γ that reaches the loading point fl in the furnace body 5 via Ps, and then moves to the pouring position ψ and the speed switching position #'P*t-conveyance drive shaft 2. The molten metal drawing position ↑3 is detected by the provided cam device 6 and limit switch device 7, and the hot water level is detected by the hot water level detection device 8 installed in parallel with the ladle 4. The ladle is detected by a motor control circuit (not shown). 4 is from the pouring position A to the speed switching position &ψ! The conveyance speed is set to high when the conveyance reaches
A method is adopted in which the conveying speed when being conveyed from P1 to the molten metal drawing position T11 is made low. The ladle 4 is transported at high speed to the speed switching position "PM" after pouring the ladle 4.
This is to shorten the return time of the hot water supply cycle by shortening the return time of the speed switching position 'P! The reason why the ladle 4 is conveyed at a low speed to the hot water drawing position A3 is to prevent the molten metal from scattering when the ladle 4 is placed in the molten metal, and to prevent the ladle 4 from corroding quickly.

However, in the case of the conventional ladle conveying method and device, the furnace body 5
When there is a lot of molten metal inside, the molten metal level and speed switching position 111'
The distance from F'x is small, so there is little time loss in the conveyance cycle, but when the molten metal decreases due to scooping, the speed switching position Ya 2 is kept at a constant position even though the molten metal level decreases. A problem arises in that the distance to be transported to the ladle 41 at low speed becomes longer, resulting in increased time loss in the transport cycle.

The method and device of the present invention are aimed at solving the above problems, and provide speed switching for switching the transport speed of the ladle from high speed to low speed when the ladle is transported from the pouring position to the #drawing position. It is assumed that the value 1M is changed in accordance with the surface change of the molten metal in the furnace body.

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

Figures M3 and 4 show an automatic-#h'#M! machine incorporating the ladle conveying device according to the present invention. % showing an example of F device,
1 In these figures, 10 is a fixed frame attached to a stand or injection frame 11, 20
is a transport drive shaft rotationally driven by the transport motor 30;
Reference numeral 40 denotes a motion transmission mechanism for reciprocating the ladle 50 along a predetermined transportation path PK according to the transportation drive shaft 200 times I, and the motion transmission mechanism 40 includes a 17th arm 60 and a second arm 70. There is.

As shown in FIG. 5, the base end of the first arm 600 is keyed to the cylindrical transport drive shaft 20.
0 is a nine cylindrical shaft 1 rotatably supported by a fixed frame 10.
It is rotatably attached within 2. First arm 60
A counterweight 61 is attached to the base paper portion. A shaft 62 is rotatably attached to the tip of the first arm 60, and the base end of the second arm 70 is fixed to the shaft 62 via a connecting member 71. It rotates around 62. Ladle 50
It is fixed to a shaft 72 which is rotatably attached to the leading end of the 27th arm 70.

A chain wheel 80 is fixed to the cylindrical shaft 12, and the shaft 6
A chain wheel 90 is fixed to the chain 8, and both chain wheels 80 and 90 rotate in the same direction.
connected by 1.

Here, the rotation speed ratio of both chain wheels 80.90 is set to 1:2, but for example, it is 1:1.5°1:1.
．． 8.1:2.5 groups may be used.

As shown in FIG. 6, a gear 21 is fixed to the conveyance drive shaft 20, and the gear 21 meshes with a gear 32 fixed to an output shaft 31 of a conveyance motor 30.

On the other hand, as shown in FIGS. 6 and 8, one end of the link 100 is fixed to the cylindrical shaft 12. A fixed frame 1 OKVi shaft 13 is rotatably attached to the vertically lower part of the cylindrical shaft 12, and a link 120 is attached to this shaft 13.
One end of the link 120 is fixed, and a shaft 121 is attached to the other end of the link 120, and the link 110 and the link 120 are rotatably connected via the shaft 121. Link 11
The other end of the link 100 is rotatably connected to the tip of the link 100 via a shaft 101.

One end of a link 130 is rotatably attached to the shaft 121, and the other end of the link 130 is rotatably attached to the shaft 131 fixed to the gear 21. Note that since the gear 21Fi rotates together with the first arm 60, the link 130 is substantially connected to the middle of the first arm 60.

As shown in FIG. 8, the end of the link 130 of the shaft 131@ is formed into a substantially U-shape, so even if the shaft 131 moves to the position indicated by the two-dot chain line in FIG. The movement will not be hindered by collision with the conveyance drive shaft 20.

Next, a mechanism for tilting the ladle 50 will be explained.

As shown in FIG. 5, a tilting drive shaft 140 is rotatably supported within the cylindrical transport drive shaft 20, and a chain wheel 141 is fixed to the tilting drive shaft 140. The second arm 70 has a shaft 1 located coaxially with the shaft 62.
42 is rotatably attached, and a chain wheel 143 and a chain wheel 141 are fixed to this shaft 142.
are connected by a chain 144. On the other hand, the chain wheel 145 fixed to the shaft 142 and the chain wheel 146 fixed to M72 are connected to the chain 147.
connected by.

As shown in FIG. 6, a chain wheel 148 is fixed to the tilting drive shaft 140. On the other hand, as shown in FIG. 7, a tilting motor (
Here, the output shaft 151 of the DC motor) 150 has a gear 1.
52 is (6) fixed, and the gear 1 meshes with the teeth 11152 on the shaft 153 rotatably attached to the fixed frame 10.
54 is fixed. Further, a chain wheel 155 is fixed to the shaft 153, and this chain wheel 155
and a chain wheel 148 are connected via a chain 156 as shown in FIG. 157 is an idler for preventing the chain 156 from slackening.

As shown in FIG. 3, an electrode 161 that forms part of a molten metal level detection device 1160, which is a molten metal pumping position detection device, is attached near the tip of the second arm 70, and this electrode 161 is connected to the furnace body. By contacting the surface of the molten metal in the furnace body 170, the electrode 162 inserted into the molten metal in the furnace body 170 becomes electrically conductive, and the motor control circuit 180 shown in FIG.
A molten metal pumping position detection signal, that is, a scene detection signal θL is sent to the relay 163. When the electrode 161 contacts the molten metal surface in the furnace body 170, the tip of the second arm 70 comes closest to the molten metal surface, and 7s of the ladle 50 enters the molten metal;
Since the arm 70 does not come into contact with the molten metal, damage to the 27th arm 70 is prevented. The position of the ladle 50 at this time is the molten metal drawing position P, and when the ladle 50 reaches this molten metal drawing position P1, the conveyance of the ladle 50 is stopped, and the ladle 50 starts a tilting operation. to pump out the molten metal.

On the other hand, a rotary encoder 190 is attached to the fixed frame 10 as a conveyance position detection device that works in conjunction with the motor shaft 31 to almost continuously detect the position of the ladle 50 on the conveyance path P. A rotary encoder 200 is attached as a tilting angle detection device that interlocks with the shaft 153 and almost continuously detects the tilting angle of the ladle 50. As shown in FIG. 10, the ``notal signals'' θ and θR are respectively sent to the motor control circuit 180 via the input signal 8fhufu.

As shown in FIG. 3, the furnace body 170 has a furnace lid 171 that opens when replenishing molten metal. A limit switch 172 for detecting the open/closed state of 171 is attached to. The detection signal from limit switch 72 is sent to motor control circuit 180.

In FIG. 10, 210Vi is a start switch used when moving manually, 220 to 222 are reference value setting devices for tilting control of the ladle 50, and 223 to 229 are reference value setting devices for the conveyance side # of the ladle 50. It is a value setter.

Setter 220 This is for setting the reference value SN of the tilting angle of the ladle 50 when the ladle 50 is kept in a standing position, that is, a substantially horizontal position.3. This is for setting the reference value SMk when turning the rotation angle to the angular position, that is, the ■tt position. Setting device 222
is for setting a reference value of 5Ft when the ladle 50 is tilted to the pouring angle position.

The setting device 223 indicates that the ladle 50 is at the pouring position P! This is for setting the reference value 5nyt of the first speed switching position P1 for switching the conveyance speed from high speed to low speed when approaching . The setting device 224 sets the pouring level &P of the ladle 50! This is for setting the reference value Say. The setting device 225 sets a reference value S of a second speed switching position P4 for switching the conveyance speed from low speed to high speed when the ladle 50 rises from the molten metal drawing position P1.
This is for setting HF.

The setting device 226#i ladle 50 moves from the pouring position P to the furnace body 17.
This is for determining the third speed switching position P, which switches the conveying speed from high speed to low speed when approaching the hot water level in 0.
Reference value Δd of the amount of movement of the ladle 50 between the molten metal pumping position P at the time of previous metal level detection and the third speed switching position P6
Set. In this case, the reference value Soh of the third speed switching position ps becomes SDR=tM+Δd based on the reference value tM of the ladle position at the time of the previous hot water level detection (this reference value 1M1lt is determined from the signal θT). Setting device 22
7 is the initial reference value Soumax of the third speed switching position pa
This is a book for setting up.

The setting device 228 is used to determine the alarm stop position WItP6 of the ladle 50 when the hot water level detection device 160 is not activated, and its reference value SA is determined by SA==tM-Δt. Here, tM is the reference value of the position of the ladle 50 at the time of the previous hot water level detection (this reference value LMVi is determined by the flaw number θ), and Δt is the reference value of the allowable lowering amount of the ladle 50. be. This reference value Δt is set in the setting device 228. The setting device 229 is for setting the initial reference value SA max of the alarm stop position P6 of the ladle 50 immediately after the start.

The setting devices 220 to 229 each have a reference value display section 220 &
~229&. The reference value may be displayed in angle or percentage. Setting device 22
Setting values from 0 to 229 can be adjusted by operating the positive and negative buttons and the dial.

In FIG. 10, a rotation speed switching circuit 34 for switching the rotation speed of the transport motor 30 between high and low speeds is connected to the drive circuit 33 of the transport motor 30. A rotation command signal RI, a reverse rotation command signal R1, and a stop command signal R3 are sent. Further, when the high speed/low speed command signals R4 and R4' are sent from the motor control circuit 180 to the rotational speed switching circuit 34, the relay 35 of the rotational speed switching circuit 34 is turned off, and the drive circuit 33 is sent to the drive circuit 33 for high or low rotational speed. Voltage R3 is sent.

The high-speed command voltage and the low-speed command voltage can be adjusted by variable resistors 36 and 37 of the rotational speed switching path 34, respectively.

On the other hand, the drive circuit 158 of the tilting motor 150 receives a forward rotation command signal R6 and a reverse rotation command signal R7 from the motor control circuit 180.
and a stop command signal R8 is sent.

The rotational speed of the tilting motor 1500 is determined based on the rotational speed command voltage R9 from the speed setting circuit 159.

FIG. 11 shows the relationship between the command signal sent to the transport motor drive circuit 33, the combined voltage, and the operating state of the transport motor 3o, as well as the command signal sent to the tilting motor drive circuit 158, the operating state of the tilting motor 150, and the operation state. This is a time chart showing the relationship between the tilting angles of the pot 50. In this figure, ta+ is the stop rotation command signal R1, (b) Fi stop command signal R3, and (c)
Vi reverse rotation command signal R2, (d) is rotation speed command voltage R5
1 (el is the operating state of the transport motor 3°, (f) is the forward rotation command signal Ls, (gl is the stop command signal Rs, (h) is the reverse rotation command signal R7, (1) is the operating state of the tilting motor 150 , (j) respectively show changes in the tilt angle of the ladle 5o.

Referring to FIGS. 3, 10, and 11, the ladle 50
When the ladle 5o starts to move from the pouring position P2 toward the hot water surface side, the conveyor motor 3o is in a high-speed reversal state, and at time t1, the ladle 5o reaches the third speed switching position fltP@, and the rotational speed increases. The command voltage R5 is switched from the high speed command voltage to the low speed command voltage, and the transport motor 30#'i enters a low speed operating state.

At time t2, the 11 poles 161 of the scene detection device [160] contact the hot water surface and send the hot water level detection signal θ to the motor control circuit 180.
By sending L, a stop command signal R is sent to the drive circuit 33.
3 is sent, and the transport motor 30 is stopped. At the same time, a normal rotation command signal R6 is sent to the drive circuit 158, and the tilting motor 150 rotates in the normal direction. As a result, the ladle 50 is tilted about the shaft 72 in a direction in which the bottom is lowered.

At time tsO, the ladle 50 reaches the measuring position and the drive circuit 1
A stop command signal R6 is sent to 58 to stop the tilting motor 150, and at the same time, a normal rotation command signal R is sent to the 1 drive circuit 33 so that the transport motor 30 starts low-speed normal rotation. Thereby, the ladle 50 rises at a low speed from the hot water drawing position P1.

At time t4, the ladle 50 reaches the second speed switching position P4, a stop command signal R3 is sent to the drive circuit 33 to stop the transport motor 30, and at the same time, a reverse rotation command signal R7 is sent to the drive circuit 158. The tilting motor 158 rotates in the reverse direction.

At time t, the ladle 50 is in the neutral position, and the drive circuit 1
A stop command signal R8 is sent to 58, and the tilting motor 150 is stopped. At the same time, a normal rotation command signal R is sent to the drive circuit 33, and the rotational speed command voltage R6 is switched to a high speed command voltage, and the transport motor 3 (1) starts high speed normal rotation.

At time t6, the ladle 50 moves to the first speed switching position P3, and the rotational speed command voltage R is switched to the low speed command voltage.

Therefore, the conveyance motor 30 is switched to the low speed normal rotation state 1i1.

At time t7, the ladle 50 reaches the pouring level (iiP!), a stop command signal R3 is sent to the drive circuit 33, and the transport motor 3
0 stops. At the same time, a reverse rotation command signal R is sent to the drive circuit 158.
7 is sent, the tilting motor 150 is reversed, and the ladle 50 is tilted in the direction of lifting the bottom with the axis 72t as the center.
When the molten metal in 50 reaches the casting apparatus, it is poured into a pouring port 230 (see FIGS. 3 and 4) of a die-casting machine.

Time 1. At this time, the pouring operation is completed at the ladle 5 (l pouring position), and at this time, a stop command signal R, is sent to the drive circuit 158, followed by a forward rotation command signal R6. The rotation motor 150 rotates normally, and the ladle 50 tilts toward the neutral position.

At time t9, the ladle 50 reaches the neutral position, a stop command signal R8 is sent to the drive circuit 158, and the tilting 150 is stopped. At the same time, the reversal command signal R1 is sent to the drive circuit 33, the rotational speed command voltage R1 is switched to the high speed command voltage, and the transport motor 3 starts high speed reversal.

As a result, the ladle 50 is at the pouring position P! It starts moving at high speed above the water surface.

The above cycle is repeated, but since the contact position between the electrode 161 of the molten metal level detection device 160 and the molten metal surface decreases as the molten metal level decreases due to the molten metal being pumped out, the molten metal drawing position p remains constant every cycle. The speed decreases by a certain distance, and accordingly, the third speed switching position P5 also decreases by a constant distance. Therefore, no time loss occurs in the transport cycle.

Next, the operation of the motor control circuit 180 will be explained with reference to the flowcharts shown in FIGS.

Fig. 12 (in al) When performing the t source input with Stella f300, in step f301, the standard value SDRmax taken in from the setting device 227 is stored as the standard value Sow, and then the standard value taken in from the setting device 229 is stored. Smua
+ax is stored as the reference value S^.

Next, in step 305, the presence or absence of a start signal is determined, and if the start switch 210 is not pressed, Stella! Returning to step 305, if the start switch 210 is pressed, the process moves to the next step 310.

At step 7'310, the ladle 50 is at the original position (θt
= Sos + rn&x).
If the attitude ladle 50 is in the original position, the rotational speed command voltage R6 from the next step 312 switching circuit 34 becomes the low speed command voltage. Next, the process moves to step 313, and a reverse rotation command signal R2 for the transport motor 30 is sent to the drive circuit 33.

Next, the process moves to step 315, where it is determined whether or not the hot water level detection device 160 is abnormal. In this case, rotary encoder 1
The position signal 0 from 90 is the reference value SA (SA = SA
If the hot water level detection signal θL is not input even if the water level is below
A stop command signal R3 is sent to the drive circuit 33, and a hot water level detection abnormality alarm is generated in step 317. In this way, the transport motor 30 stops (step 318).

Therefore, if the hot water level detection device 160 fails, the second arm 70 is prevented from entering the molten metal and causing failure. The hot water level detection device 160 is normal (θT>SA
), the process moves to the next step 320.

In step 320, when the hot water level detection device 160 does not detect the hot water level, the process returns to step 315, and when the hot water level is detected, the detection signal θLf is inputted and the next step 32
Move to 1. In step 321, a stop command signal R3 for the transport motor 30 is sent to the drive circuit 33, and the transport motor 30 is stopped. In the next step 322, the current transport position 0 is stored as the reference value LM, and in the next step 323, the reference value S of the third speed switching position [Rs
DR is calculated (AM+Δd) and the result is stored as the reference value Son. Okay, next step 9. /pu324
, the calculation of the reference value SA of the alarm stop position P8 (tM
-Δt) and store the result as the reference value SA. Further, in step 325, the tilting motor 150
A stop rotation command signal R8'1 is sent to the drive circuit 158, and the process moves to the next step 330.

At Stella 7'' 330, it is determined whether the tilt angle of the handle M50 has reached the measuring position (θ8≧SM?), and if it has not reached the measuring position, the process returns to the measuring step 330, and when it has reached the measuring position, the process proceeds to the next step. In step 331, a stop command signal R8 for the tilting motor 150 is sent to the drive circuit 158.In addition, in the next step 332, a normal rotation command signal Rs' for the transport motor 30 is sent to the drive circuit 33, and in the next step 335.
(See FIG. 12(b)).

Referring to FIG. 12 fbj, in step 335, it is determined whether the ladle 50 has reached the second speed switching position P4 (θ
T≧SHF 'i') f is judged, and if it has not been reached, the process returns to step 335, and if it has been reached, the process moves to the next step 336 and a stop command signal R is sent to the transport motor 30.
In step f337, a reverse rotation command signal R7 for the tilting motor 150 is sent to the drive circuit 158, and the process moves to the next step 340.

In step 340, it is determined whether the ladle 50 has reached the neutral position (θR≦88?), and if it has not reached the neutral position, return to step 340 again, and if it has reached the neutral position, proceed to the next step, step 341. A stop command signal R for the tilting motor 150 is sent to the drive circuit 158. Further, in step 342, a high-speed rotation command signal R4 for the transport motor 30 is sent.
is sent to the rotational speed switching circuit 34, and a normal rotation command signal R, for the transport motor 30 is sent to the drive circuit 33 in step 343. As a result, the transport motor 30 starts rotating at high speed.

In the next step 345, it is determined whether the ladle 50 has reached the first speed switching position flips (θT≧SDF?), and if it has not reached it, it returns to Stella 7″ 345, and when it has reached the next Moving on to Stella F346, transport motor 30
The low speed multiplex command signal R4' for the rotation speed switching circuit 3
Send to 4. Therefore, the transport motor 30 is in a low speed forward rotation state.

In the next step 350, the ladle 50 is moved to the pouring position P,
It is determined whether the value has been reached (θT≧Say?), and if it has not been repeated, the process returns to step 350, and when it has been reached, the process proceeds to the next step 351, where the stop command signal R3 to the transport motor 30 is sent to the drive circuit. 33 and next step 35
2 (see FIG. 12(c)) Move to K.

Referring to FIG. 12 (eve), in step 352, a reverse rotation command signal R7 for the tilting motor 150 is sent to the drive circuit 158, and the process moves to the next stellar f355.

In step 355, it is determined whether the tilting angle of the ladle 5o has reached the pouring position (θR≦SF?)′l1l-,
If not, the process returns to step 355, and when the process reaches step 356, a stop command signal R8 for the tilting motor 150 is sent to the drive circuit 158. Also,
In step 357, a normal rotation command signal R- for the tilting motor 150 is sent to the drive circuit 158, and the process moves to the next step 360.

In step 360, it is determined whether the ladle 50 has reached the neutral position (θ rat ≧ SN'i'), and if it has not reached the neutral position, the process returns to step 360, and if it has reached the neutral position, the next step is step 361. Then, a stop command signal R8 for the tilting motor 150 is sent to the drive circuit 158.

In the next step, step 370, it is determined whether the furnace lid 171 has been opened, that is, whether molten metal has been replenished,
When replenishment is performed, move to the next Stella f371 and set the reference value 5DRrnhx f taken from the setting device 227.
After storing the reference value SD [1] and storing the reference value SA whx taken from the setting device 227 as the reference value 8 people, the process moves to the next step 372 . On the other hand, when the furnace lid 171 is closed during normal pumping without replenishment, the process moves directly from step 370 to step 372. Then, in step 372, the transport motor 30
The high speed rotation command 4FK No. R4 for the speed switching circuit 34
Also, in step 373, the transport motor 3
A reverse rotation command signal R2 for 0 is sent to the drive circuit 33.

In the next step 375, it is determined whether the ladle 50 has reached the third speed switching position Ps (θd ≦ SDR?). If it has not reached the third speed switching position Ps, the process returns to step 375 again. Moving on to Step 376.

Note that the reference value 5D11 is the reference value (
tM+Δd), and step 371f:
If so, the reference value Spa tll&X stored in step 371 is used. Step 376
, low speed rotation command signal R to the transport motor 30
4' is sent to the rotation speed switching circuit 34, and then step 3
15 (FIG. 12(a)).

Although the embodiments have been described above, the method and apparatus t of the present invention are not limited to the embodiments described above, but also include the following modifications.

(1) It is preferable to start normal rotation of the ladle 50 when the ladle 50 reaches the third speed switching position ps.

(2) Second speed switching position P4 standard value 5DR of ladle 50
The determination may be made using O11X.

(3) The motion transmission mechanism for transporting the ladle may be of conventional type as shown in FIGS. 1 and 3.

(4) The tilting operation of the ladle when pouring hot water may be omitted. That is, the molten metal may be poured into the ladle by placing the ladle into the molten metal while keeping the ladle in the neutral position.

(5) A microcomputer may be used as the motor control circuit, or a book that combines a hard drive circuit and a range control circuit may be used.

As is clear from the above description, the method and apparatus of the present invention change the speed switching position for switching the transport speed of the ladle from high speed to low speed when the ladle is transported from the pouring position to the drawing position. Since the temperature changes in response to changes in the molten metal level inside the body, there is no time loss in the ladle transport stroke due to changes in the molten metal level in the furnace, and hot water supply work to casting equipment such as die casting machines can be carried out efficiently and automatically. become able to.

[Brief explanation of the drawing]

Fig. 1 is a front view of an automatic water heater showing the prior art, Fig. 2 is a side view of the automatic water heater shown in Fig. 1, and Fig. 3 is a built-in ladle conveying device used in the method of the present invention. FIG. 4 is a front view showing an embodiment of the automatic water heater, FIG. 4 is a plan view of the automatic water heater shown in FIG. 3, and FIGS. 5, 6, and 7 are views of the automatic water heater shown in FIG. 8 is a sectional view taken along the line ■-■ in FIG. 6, FIG. 9 is a partial sectional view taken along the line ■-■ in FIG. 7, and FIG. 10 is a sectional view taken along the line 3 The control circuit of the automatic water heater shown in the figure! Lower Fig. 2 and Fig. 11 are time charts showing the relationship between the signals from the motor control circuit and the operating state of the motor in the automatic water heater shown in Fig. 3;
FIG. 12 (al, (b), fe) is a flowchart showing the operation of the motor control circuit in the automatic water heater shown in FIG. 3. 20... Conveyance drive shaft, 30... Conveyance motor, 40.
...Motion transmission mechanism, 50... Ladle, 150... Tilt motor, 160... Molten metal level detection device (molten metal scooping position detection device). 170...furnace body, 190,200...rotary encoder, Pl...molten metal pumping position, P2...molten metal pouring position, P3. P4. P%...Speed switching position, 33...
Conveyance motor drive circuit (control device), 34... Rotation speed switching circuit (control device), 180... Motor control circuit (
Control device). Patent applicant Ube Industries Co., Ltd. Patent agent Akira Aoki Patent attorney Kazuyuki Nishidate Patent attorney Kuni Nishioka Akira Yamaguchi Figure 4 Area 6V Figure 7

Claims (1)

[Claims] ] The ladle is transported at high speed along a predetermined transport path from a pouring position near the casting device to a speed switching position fIIL above the molten metal in the furnace body, and then decelerated from the speed switching position. In the method of conveying a ladle for automatic hot water supply in which the ladle is conveyed to a molten metal drawing position in the furnace body, the molten metal level in the furnace body is changed by changing the speed switching position in response to a change in the molten metal level in the furnace body. A method for conveying a ladle for automatic hot water heating in which the distance between the speed switching position and the speed switching position is maintained constant. 2. A conveyance drive shaft driven by a conveyance motor is connected to the ladle, and a predetermined conveyance is carried out from the pouring position near the casting device to the molten metal scooping position in the furnace body according to the rotational movement of the conveyance drive shaft. a motion transmission mechanism that reciprocates the ladle along the path; a transport position detection device that operates in conjunction with the transport drive shaft to almost continuously detect the position of the ladle on the transport path; A molten metal pumping position detection device that emits a detection signal when the position is about to be reached, and a transport motor that rotates forward/reversely and stops based on the detection signals from the transport position detection device and #molten metal pumping position detection device. , a control device for switching the rotational speed of a transport motor from high speed to low speed when the ladle reaches a position on the furnace body side that is a predetermined distance away from the previous speed switching position from the pouring position. Device. 3. The ladle conveyance device for automatic hot water supply according to claim 2, wherein the conveyance position detection device is a rotary encoder interlocked with a conveyance drive shaft.