JP6050058B2 - Hot water supply apparatus and hot water supply method - Google Patents

Description

  The present invention relates to a technology of a hot water supply apparatus and a hot water supply method for pumping molten metal in a molten metal furnace with a ladle.

  Die casting is one of mold casting methods, and is known to produce a large amount of high dimensional accuracy castings in a short time by press-fitting molten metal into the mold. In the die casting machine, the molten metal is supplied to the hot water inlet of the injection sleeve by the hot water supply device. The hot water supply device is a device that pumps a predetermined amount of molten metal from a molten metal furnace that is stored for heating and holding the molten metal by a ladle and supplies the molten metal into an injection sleeve (for example, Patent Document 1).

  Such a hot water supply apparatus lowers the ladle supported by the movable arm to the liquid level of the molten metal furnace, detects the liquid level height of the molten metal by a liquid level detection sensor provided on the movable arm, and uses the ladle to melt the molten metal. It is configured to pump up. However, in the pumping operation of the molten metal by the hot water supply device, the liquid level may be undulated and the liquid level may not be stable due to the previous pumping operation or the impurity removal operation of the liquid surface of the molten metal.

  When the liquid level is detected by the liquid level detection sensor when the liquid level is not stable, the liquid level detection sensor detects the liquid level higher than the original liquid level and However, since the molten metal is pumped out at a position higher than the original liquid level, the pumping is performed empty, or pumping out of the reference amount occurs. Therefore, in the hot water supply apparatus, it is required to prevent empty pumping in a state where the liquid level is not stable or pumping out of the reference amount.

JP 2012-016714 A

  The problem to be solved by the present invention is to provide a hot water supply apparatus and a hot water supply method capable of preventing empty ladle pumping and pumping out of a reference amount.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

  That is, in claim 1, there is provided a hot water supply device for pumping up the molten metal in the molten metal furnace with a ladle, the liquid level detecting means for detecting the liquid level of the molten metal in the molten metal furnace, and the liquid level detection. A control device that adjusts the pumping position of the ladle based on the liquid level detected by the means, and the control device has a liquid level at the previous pumping and a liquid level at the current pumping. If the difference in liquid level is smaller than the predetermined height, it is determined that the liquid level at the time of pumping is abnormal.

  In Claim 2, It is a hot-water supply apparatus of Claim 1, Comprising: The weight measurement apparatus which measures the molten metal weight in a molten metal furnace is provided, The said control apparatus is the molten metal at the time of the previous pumping measured by the said weight measurement apparatus When the difference between the weight and the molten metal weight measured by the weight measuring device at the current pumping is smaller than a predetermined weight, it is determined that the liquid level at the current pumping is abnormal. .

  In Claim 3, it is the hot water supply method which pumps up the molten metal in a molten metal furnace by ladle, Comprising: The liquid level height at the time of pumping last time and the liquid level height at the time of pumping this time are detected, When the liquid level difference is smaller than the predetermined height, it is determined that the liquid level at the time of the pumping is abnormal.

  In Claim 4, it is the hot-water supply method of Claim 3, Comprising: The molten metal weight at the time of the last pumping and the molten metal weight at the time of the current pumping is detected, The said molten metal weight difference is smaller than predetermined weight In this case, it is determined that the liquid level at the time of pumping is abnormal.

  According to the hot water supply apparatus and the hot water supply method of the present invention, empty pumping of the ladle and pumping out of the reference amount can be prevented.

The schematic diagram which showed the structure of the hot water supply apparatus of 1st embodiment. The flow figure which showed the flow of hot water supply control similarly. The schematic diagram which showed the structure of the hot water supply apparatus of 2nd embodiment. The flow figure which showed the flow of hot water supply control similarly.

The structure of the hot water supply apparatus 100 is demonstrated using FIG.
In addition, in FIG. 1, the structure of the hot water supply apparatus 100 is represented typically. Moreover, the broken line of FIG. 1 has shown the electric signal line.

  Hot water supply apparatus 100 is a first embodiment of the hot water supply apparatus of the present invention. The hot water supply device 100 is a device that pumps a predetermined amount of molten metal from the molten metal furnace 50 by a ladle 130 and supplies hot water to an injection sleeve (not shown) at a predetermined timing. The molten metal furnace 50 stores the molten metal for heating and holding. The injection sleeve is provided in a die casting machine and is provided with a hot water supply port through which molten metal is supplied.

  The hot water supply device 100 includes a support frame 110, a ladle transport link arm mechanism 120, a ladle 130, a ladle transport motor 141, a ladle rotation motor 142, a controller 150 as a control device, and a liquid level detection. And a liquid level detection sensor 151 as a means.

The support frame 110 is fixed in the vicinity of the die casting machine.
The ladle transport link arm mechanism 120 is provided downward from the support frame 110. The link arm mechanism 120 for transporting the ladle is configured so that the five link arms operate in cooperation to transport the ladle 130 between the injection sleeve of the die casting machine and the molten metal furnace 50.

  The ladle 130 is attached to the distal end side of the ladle transport link arm mechanism 120 to pump up the molten metal. The ladle 130 is transported between the molten metal furnace 50 and the injection sleeve by the ladle transport link arm mechanism 120.

  The ladle transport motor 141 drives the ladle transport link arm mechanism 120. The ladle rotation motor 142 rotates the ladle 130 attached to the tip of the ladle transport link arm mechanism 120 via a drive transmission mechanism.

  The controller 150 includes a CPU that controls various operations of the hot water supply apparatus 100 as a whole. The controller 150 is connected to a ladle transport motor 141, a ladle rotation motor 142, and a liquid level detection sensor 151.

  The liquid level detection sensor 151 detects the liquid level of the molten metal stored in the molten metal furnace 50 by contacting the molten metal stored in the molten metal furnace 50. The liquid level detection sensor 151 is provided on the front end side of the link arm mechanism 120 for ladle conveyance.

The flow of hot water supply control S100 will be described with reference to FIG.
In FIG. 2, the flow of hot water supply control S100 is represented by a flowchart.

The hot water supply control S100 is a first embodiment of the hot water supply apparatus and hot water supply control of the present invention.
The hot water supply control S100 lowers the ladle 130 from the initial position to the vicinity of the liquid level of the molten metal furnace 50, draws a predetermined amount of molten metal from the molten metal furnace 50 by the ladle 130, and supplies hot water to the injection sleeve (not shown) at a predetermined timing. It is control to do.

  In step S <b> 110, the controller 150 lowers the ladle 130 to the vicinity of the liquid level of the molten metal furnace 50 by the ladle transport link arm mechanism 120.

In step S <b> 120, the controller 150 detects the liquid level height H ₀ of the molten metal furnace 50 using the liquid level detection sensor 151.

In step S130, the controller 150 detects the previous liquid level height H- ₁ detected during the previous pumping (during hot water supply control) and the liquid level height detected during the current pumping (during hot water supply control) detected in step S120. calculating a liquid level difference dH is the difference between the H _0.

In step S140, the controller 150, the liquid surface height difference dH calculated in step S130 to check whether it dH ₁ or more predetermined height. The controller 150, when the liquid level difference dH is dH ₁ or more predetermined height, the process proceeds to step S150.

In step S140, the controller 150, when the liquid level difference dH predetermined height dH ₁ smaller, it is determined that the liquid level _{H 0} of the current detected in step S120 is abnormal, step S120 again Migrate to The predetermined height dH ₁ is a numerical value preset in the controller 150 in advance, and represents a liquid level height that is lowered by normal one-time pumping of the molten metal by the ladle 130. In addition, the liquid level height H ₀ at this time is assumed to be a case where the liquid level is ruffled due to pumping work or impurity removal work on the liquid surface of the molten metal, and the liquid level is not stable.

  In step S <b> 150, the controller 150 draws up the molten metal in the molten metal furnace 50 using the ladle 130.

  In step S160, the controller 150 conveys the ladle 130 to the injection sleeve by the ladle conveyance link arm mechanism 120, and supplies molten metal to the injection sleeve.

  Note that in the hot water supply control S100, if abnormalities occur continuously in step S140, it is possible that an abnormality has occurred in the hot water supply device 100, and therefore it is preferable to stop the hot water supply device 100.

The effects of the hot water supply apparatus 100 and the hot water supply control S100 will be described.
According to the hot water supply apparatus and the hot water supply method, empty pumping of the ladle 130 and pumping out of the reference amount can be prevented.

  Conventionally, if the liquid level is unstable due to pumping work or impurity removal work on the melt, the liquid level detection sensor 151 detects a liquid level higher than the original liquid level. However, since the ladle 130 pumps out the molten metal at a liquid level higher than the original liquid level, there has been an empty pumping or pumping out of the reference amount.

According to the water heater 100 and the hot water supply control S100 of the first embodiment, when the liquid surface height difference dH is less than the predetermined height dH _1, again, the liquid level detection sensor 151, the liquid surface height of the molten metal furnace 50 Since the height H ₀ is detected, it is possible to prevent empty pumping or pumping out of the reference amount.

The configuration of the hot water supply apparatus 200 will be described with reference to FIG.
In addition, in FIG. 3, the structure of the hot water supply apparatus 200 is represented typically. Moreover, the broken line of FIG. 3 has shown the electric signal line.

  The hot water supply apparatus 200 is a second embodiment of the hot water supply apparatus of the present invention. The hot water supply device 200 is a device that draws a predetermined amount of molten metal from the molten metal furnace 50 by a ladle 230 and supplies hot water to an injection sleeve (not shown) at a predetermined timing.

  The hot water supply device 200 includes a support frame 210, a ladle transport link arm mechanism 220, a ladle 230, a ladle transport motor 241, a ladle rotation motor 242, a controller 250 as a control device, and a liquid level detection. The liquid level detection sensor 252 as a means and the molten metal weight detection sensor 253 as a molten metal weight detection means are provided.

  The support frame 210, the ladle transport link arm mechanism 220, the ladle 230, the ladle transport motor 241 and the ladle rotation motor 242 of the hot water supply device 200 are the same as the support frame 110 and the ladle transport link arm of the hot water supply device 100 of the first embodiment. Since it is the same as the mechanism 120, the ladle 130, the ladle conveyance motor 141, and the ladle rotation motor 142, description thereof will be omitted.

  The controller 250 includes a CPU that controls various operations of the hot water supply apparatus 200 as a whole. The controller 250 is connected to a ladle transport motor 241, a ladle rotation motor 242, a liquid level height detection sensor 252, and a molten metal weight detection sensor 253.

  The liquid level detection sensor 252 detects the liquid level of the molten metal stored in the molten metal furnace 50 in a non-contact manner without contacting the molten metal stored in the molten metal furnace 50. The liquid level detection sensor 252 is provided above the molten metal furnace 50.

  The molten metal weight detection sensor 253 detects the weight of the molten metal stored in the molten metal furnace 50. The molten metal weight detection sensor 253 is provided below the bottom surface of the molten metal furnace 50.

The flow of hot water supply control S200 will be described with reference to FIG.
In FIG. 4, the flow of hot water supply control S200 is represented by a flowchart.

Hot water supply control S200 is a second embodiment of the hot water supply apparatus and hot water supply control of the present invention.
In the hot water supply control S200, the ladle 230 is lowered from the initial position to the vicinity of the liquid level of the molten metal furnace 50, a predetermined amount of molten metal is pumped from the molten metal furnace 50 by the ladle 230, and hot water is supplied to the injection sleeve (not shown) at a predetermined timing. It is control to do.

  Steps S210 to S250 of the hot water supply control S200 are the same as steps S110 to S150 of the hot water supply control S100 of the first embodiment, and a description thereof will be omitted.

In step S260, the controller 250 detects the molten metal weight W ₀ stored in the molten metal furnace 50 after the step (S250) of pumping the molten metal with the ladle 230 when pumping the molten metal (during hot water control). Detected by H.253.

In step S270, the controller 250 is the difference in the time of pumping and the previous melt weight _{W -1} (when the hot water supply control), and the melt weight _{W 0} during pumping of this detected in step S250 (when the hot water supply control) the melt The weight difference dW is calculated.

In step S280, the controller 250, the molten metal weight difference dW calculated in step S270 to check whether the predetermined weight difference dW ₁ or more. If the molten metal weight difference dW is equal to or greater than the predetermined weight difference dW ₁ , the controller 250 proceeds to step S300.

The predetermined weight difference dW ₁ is a numerical value preset in the controller 250 in advance, and represents the weight of the molten metal that is reduced by one normal pumping.

In step S280, the controller 250, when the molten metal weight difference dW is smaller than the predetermined weight difference dW ₁ is liquid level dH ₀ this time detected in step S220 is determined to be abnormal, the process proceeds to step S290 . Note that the current liquid level height H ₀ is abnormal, for example, when the liquid level detection sensor 252 that is a non-contact type sensor erroneously detects the liquid level.

  In step S290, the molten metal pumped out by the ladle 230 is returned again into the molten metal furnace 50, and the process proceeds to step S220 again.

  In step S300, the controller 250 conveys the ladle 230 to the injection sleeve by the ladle conveyance link arm mechanism 220, and supplies molten metal to the injection sleeve.

  In the hot water supply control S200, if abnormalities occur continuously in step S240, it is possible that an abnormality has occurred in the hot water supply device 100. Therefore, it is preferable to stop the hot water supply device 200.

The effects of the hot water supply apparatus 200 and the hot water supply control S200 will be described.
According to the hot water supply apparatus and the hot water supply method, empty pumping of the ladle 230 and pumping out of the reference amount can be prevented.

According to the water heater 200 and the hot water supply control S200 in the second embodiment, if the liquid level difference dH is not at dH ₁ or more predetermined height, again, by the liquid level detection sensor 252, the liquid surface of the molten metal furnace 50 Since the height H ₀ is detected, it is possible to prevent empty pumping or pumping out of the reference amount.

If the molten metal weight difference dW is not equal to or greater than the predetermined weight difference dW ₁ , the liquid surface height detection sensor 252 detects the liquid surface height H ₀ of the molten metal furnace 50 again by the liquid surface height detection sensor 252. Even if a false detection is detected, it is possible to prevent empty pumping or pumping out of the reference amount.

50 Melting furnace 120 Link arm mechanism for ladle conveyance 130 Ladle 150 Controller 151 Liquid level detection sensor 250 Controller 252 Liquid level detection sensor 253 Molten weight detection sensor

Claims (4)

A hot water supply device that pumps the molten metal in the molten metal furnace with a ladle,
A liquid level detection means for detecting the liquid level of the molten metal in the molten metal furnace;
A control device that performs various operations control of the entire hot water supply device, and that adjusts the pumping position of the ladle based on the liquid level detected by the liquid level detection means;
Comprising
The control device includes a liquid level before pumping last, when the liquid level difference between the liquid level before pumping current is less than the predetermined height, the height of the liquid surface of the pre-pumping the current is abnormal A hot water supply apparatus that causes the liquid level detection means to repeatedly detect the liquid level height and to pump up the molten metal into the ladle when the difference in liquid level height exceeds a predetermined height . The hot water supply device according to claim 1,
Further comprising a weight measuring device for measuring the melt weight in the melt furnace,
The control device, the molten metal weight after the previous pumping measured by the weight measuring device,
If the molten metal weight difference with the molten metal weight after the current pumping measured by the weight measuring device is smaller than a predetermined weight, it is determined that the liquid level height before the pumping is abnormal.
Hot water supply device. A hot water supply method for pumping up molten metal in a molten metal furnace with a ladle,
Detects the difference between the liquid level before the previous pumping and the liquid level before the pumping this time,
When the liquid level difference is smaller than a predetermined height, it is determined that the liquid level before pumping is abnormal and the liquid level is repeatedly detected, and the liquid level difference is predetermined. A hot water supply method for pumping up molten metal with the ladle when the height exceeds a given level . A hot water supply method according to claim 3,
Detecting the difference between the weight of the melt after the previous pumping and the weight of the melt after the pumping this time,
When the molten metal weight difference is smaller than a predetermined weight, it is determined that the liquid level before pumping is abnormal.
Hot water supply method.

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