JP4230479B2 - Stop positioning method and apparatus for ladle transport cart - Google Patents

Description

  The present invention relates to a stop positioning method and apparatus for a ladle transport cart, and in particular, even when the ladle is not on the center of the transport cart, the center of the ladle is always used for a roller table as a relay ladle transport means. Since it coincides with the center, the ladle relates to a stop positioning method and apparatus for a ladle transport carriage that is smoothly transferred from the transport carriage to the roller table.

  Ductile casts such as ductile cast iron pipes have the same tensile strength as steel materials, and their mechanical test values such as elongation and toughness are ten times that of regular cast iron, and they have excellent corrosion resistance equivalent to regular cast iron. Therefore, it is widely used in various piping materials under more severe environments such as underground pipes that require these characteristics.

  This ductile casting uses iron scrap as the main iron source material, and adds a graphite spheroidizing agent such as metal Mg to the hot water melted by cupola or electric furnace to melt molten cast iron for ductile casting. Is manufactured by casting using a casting equipment such as a centrifugal casting machine.

  When melting the hot water melted in the melting furnace into the molten cast iron for ductile castings, the hot water melted in the melting furnace is usually charged into the holding furnace, stored and retained in the holding furnace at a temperature. After homogenizing the ingredients and ingredients, take a specified amount of hot water from the holding furnace into the ladle and add the graphite spheronizing agent in the ladle or divide the hot water in the ladle. The graphite spheroidizing treatment is performed by adding the graphite spheroidizing agent to the brewed hot water and then combining with the hot water, and conventionally, after the ladle containing the hot water and the graphite spheroidizing treatment are performed The ladle containing the molten metal is lifted by a crane, a hoist or the like, and conveyed between a holding furnace and a graphite spheroidizing apparatus.

  Cranes and hoists are widely and commonly used as heavy goods conveying means in the steel industry and the metal processing industry. Since the air is used as the transport route, there is an advantage that it is not necessary to provide a special transport route.

  However, when the ladle containing the molten metal is transported by a crane, in consideration of a case, other manufacturing equipment is usually not arranged immediately below the transport route. Therefore, it is necessary to leave the place directly under the transport route and the place that is expected to be affected in the unlikely event that it is an excellent transport means from the viewpoint of effective use of the factory site. hard.

  Moreover, when transporting using a crane or a hoist, an operator who operates the crane or the hoist is necessary, and at the same time, a slinging operator who confirms the state of the crane hook or the like is necessary on the ground. In this case, in a crane with a high operation rate, it is necessary for an operator to always get on the crane and operate the crane. The operator will wait for that period.

  Thus, conventionally, when melted cast iron for ductile castings is melted from original hot metal through a graphite spheroidizing treatment device from a holding furnace, the molten metal is transported by a transport device having lifting means such as a crane. In addition to requiring a dedicated operator to operate the transport device and requiring instructions and cues from the slinging operator for each work, it is difficult to say that it is a work with high labor productivity. It was one factor that raised the cost.

  Therefore, Patent Document 1 discloses a melting facility for molten cast iron for ductile casting that solves the above-described problems. Hereinafter, this is referred to as the prior art, and will be described with reference to the drawings.

  FIG. 5 is a schematic plan view showing the prior art, FIG. 6 is a side view showing a transport cart on which a ladle is placed, FIG. 7 is a plan view showing the transport cart, and FIG. 8 is a plan view showing a ladle. The side view which shows the roller table as a ladle transfer means for relays, FIG. 9 is a top view which shows the roller table as a ladle transfer means for relays.

  As shown in FIG. 5, the prior art melting equipment for molten cast iron for ductile casting includes a holding furnace 1, and a graphite spheroidizing treatment device 3 for adding a graphite spheroidizing agent such as Mg into a ladle 2. And a waste disposal device 4 for discharging the slag in the ladle 2 are arranged side by side in the horizontal direction, and a pair of rails 5 extending substantially linearly along these devices are laid. The transport cart 6 travels.

  The holding furnace 1 is a container for temporarily storing a hot water (molten cast iron) melted in a melting furnace such as a cupola or an electric furnace before being cast by a casting equipment such as a centrifugal casting machine, and the inner wall is made of a refractory. It is a furnace that is configured and that can heat the hot water contained by low-frequency induction or the like.

  The graphite spheroidizing treatment device 3 is a device for adding graphite spheroidizing agent to the main hot water to spheroidize the graphite in the main hot water and melting molten cast iron for ductile casting from the main hot water. Using pure Mg, Fe-Si-Mg alloy, Ni-Mg alloy, Cu-Mg alloy, rare earth metal, etc., as appropriate, such as pouring method, ladle addition method with lid, plunger method, pressure addition method, wire feeder method, etc. It is an apparatus which adds by the addition means.

  The waste disposal apparatus 4 is an apparatus that removes slag floating on the molten cast iron for ductile casting and improves the quality of the cast ductile casting, and tilts the ladle 2 to remove the waste station. 7 slag is discharged into the pot 8.

  As shown in FIGS. 6 and 7, the transport carriage 6 is self-propelled on the rail 5 by the wheels 10 driven by the drive unit 9. Above, a roller table 11 is installed as a trolley side ladle transfer means for transferring the ladle 2 in a direction orthogonal to the traveling direction of the transport carriage 6. The roller table 11 includes a plurality of rollers 12 arranged in two rows having a concave portion at the center, and each roller 12 is driven by an electric motor 13, a speed reducer 14, a transmission device 15, and the like.

  Transfer of ladle for relay for transferring ladle 7 between holding furnace 1 and rail 5, between graphite spheroidizing device 3 and rail 5, and between waste disposal device 4 and rail 5 Roller tables 16 </ b> A to 16 </ b> C as means are installed at right angles to the rail 5. As shown in FIG. 8 and FIG. 9, each structure of the roller tables 16 </ b> A to 16 </ b> C (only 16 </ b> A is shown in the figure) is formed in two rows having a recessed central portion, like the roller table 11 of the transport carriage 6. It consists of a plurality of rollers 12 arranged, and each roller 12 is driven by an electric motor 13, a speed reducer 14, a transmission 15 and the like.

  A pair of rails 17 are fixed to the bottom surface of the ladle 2, and the rails 17 are supported by the roller table 11 or 16 </ b> A to 16 </ b> C in a state where the rails 17 enter the recesses of the roller 12. It is supposed to be transferred.

  A laser sensor 18 is installed on the extended line of the rail 5, and the location of the transport carriage 6 is constantly monitored by the laser sensor 18 and stops at a predetermined position.

  In the vicinity of the waste disposal apparatus 4, there is installed an over-building transport carriage 19 for transporting the ladle 2 subjected to the waste disposal to another building where a casting facility such as a centrifugal casting machine (not shown) is installed. Yes.

  A method for melting molten cast iron for ductile castings according to the above-described prior art will be described below.

  The raw material obtained by melting the hot water (molten cast iron) in a melting furnace such as a cupola or electric furnace using an iron source such as iron scrap and carbonaceous material such as coke, and further desulfurizing treatment if necessary Hot water is once stored in the holding furnace 1.

  The empty ladle 2 is kept waiting on the roller table 16 </ b> A, the holding furnace 1 is tilted, and the hot water is poured into the ladle 2. After pouring is completed, the ladle 2 containing the main hot water is transferred toward the rail 5 by the roller table 16A. During this time, the transport cart 6 automatically moves to a predetermined position on the front surface of the roller table 16 </ b> A, and the ladle 2 is transferred from the roller table 16 </ b> A to the roller table 11.

  In this way, when the ladle 2 is placed on the transport carriage 6, the transport carriage 6 travels to the front position of the roller table 16B and stops at a predetermined position. When the transport cart 6 stops, the roller table 11 and the roller table 16B of the transport cart 6 automatically operate, and the ladle 2 is transferred from the transport cart 6 to the roller table 16B. Thereafter, the iron-coated Mg wire is supplied to the main hot water in the ladle 2 by the graphite spheroidizing treatment apparatus 3, and the main hot water is melted into the molten cast iron for ductile casting.

  When a predetermined amount of iron-coated Mg wire is added and the graphite spheroidizing treatment with Mg is finished, the ladle 2 containing the molten cast iron for ductile casting is again transferred onto the transport carriage 6 by the roller table 16B and the roller table 11. Can be put on. Thereafter, the transport carriage 6 travels to the front position of the roller table 16C and stops at a predetermined position. When the transport cart 6 stops, the roller table 11 and the roller table 16C are automatically operated, and the ladle 2 is transferred from the transport cart 6 to the roller table 16C. Thereafter, the slag in the ladle 2 is discharged into the dredging pot 8 by using a discharging jig at the discharging station 7. After this, the ladle 2 is transferred onto the ridge-carrying carriage 19 that has been waiting in front of the roller table 16C in advance. Then, the ladle 2 is conveyed by the building-carrying carriage 19 to another building in which casting equipment such as a centrifugal casting machine is installed.

  During this time, the empty ladle 2 is placed on the transport carriage 6 and transferred to the holding furnace 1 by the roller table 16A, and the above-described steps are repeated.

  As described above, according to the prior art, since there is no work of lifting the ladle 2 with a crane or the like in a series of processes, most of the work can be performed automatically, and labor saving and production accompanying labor saving are achieved. In addition to being improved, it has the effect of being excellent in safety and being able to effectively utilize the factory site.

JP 2004-169082 A

  However, the prior art has the following problems. The transport carriage 6 has a center of the roller table 16A (center between the two rows of rollers) and the center of the transport carriage 6, that is, the center of the roller table 11 of the transport carriage 6 (two rows) by the laser sensor 18 or the like. The ladle 2 on the transport carriage 6 may be shifted to the left and right with respect to the traveling direction of the ladle 2 (see FIG. 1). is there. In this state, when the ladle 2 is transferred by the roller table 11, the rail 17 of the ladle 2 does not enter the recess of the roller 12, and the tip of the rail 17 comes into contact with the roller 12, and as a result, the ladle 2 is moved to the roller. In some cases, the line cannot be transferred to the table 16A, and the line must be temporarily stopped for alignment.

  The reason why the ladle 2 on the transport carriage 6 is shifted to the left and right with respect to the traveling direction of the ladle 2 is as follows.

  (A) Since the empty ladle 2 is hung on the transport cart 6 by a crane at the start of operation, it is difficult to align the centers at that time. That is, since the width of the concave portion of the roller 12 is wider than the width of the rail 17 of the ladle 2, it is difficult to suspend the rail 17 of the ladle 2 accurately at the center of the concave portion of the roller 12.

  (B) During operation, when the empty ladle 2 is transferred from the transport carriage 6 to the roller table 16A, since the ladle 2 is light, a slight shift occurs while the ladle 2 is repeatedly stopped and started. .

  (C) When the left and right rails 17 of the ladle 2 are reduced, a shift occurs.

  Therefore, in the present invention, even when the ladle is not on the center of the transport carriage, the center of the ladle always coincides with the center of the roller table as the relay ladle transfer means. It is providing the stop positioning method and apparatus of a ladle conveyance trolley transferred to a roller table from a conveyance trolley.

  The present invention has been made to achieve the above object, and is characterized by the following.

The invention according to claim 1 is characterized in that the ladle is placed on a trolley side ladle transfer means provided on the transport trolley and capable of transporting the ladle in a direction perpendicular to the traveling direction of the transport trolley. , Travel to the ladle transfer means for relay provided in a direction orthogonal to the travel direction of the transport cart, and transfer the ladle on the ladle side ladle transfer means to the relay ladle transfer means In the stop positioning method of the transport carriage, the cart-side ladle transfer means and the relay ladle transfer means are from a roller table capable of transporting the ladle via a rail provided on the lower surface of the ladle. Configured, the position of the rail of the ladle on the transport carriage is detected by a laser-type distance detector, and the center of the ladle coincides with the center of the relay ladle transfer means. Characterized by correcting the stop position It is intended to.

The invention according to claim 2 is characterized in that a ladle is placed on a trolley side ladle transfer means provided on the transport trolley and capable of transporting the ladle in a direction orthogonal to the traveling direction of the transport trolley. , Travel to the ladle transfer means for relay provided in a direction orthogonal to the travel direction of the transport cart, and transfer the ladle on the ladle side ladle transfer means to the relay ladle transfer means In the stop positioning device for the transport cart, the cart-side ladle transfer means and the relay ladle transfer means are from a roller table capable of transporting the ladle via a rail provided on the lower surface of the ladle. The center of the ladle and the transfer of the ladle for the relay based on the position data of the rail by the position detection means comprising a laser-type distance detector configured to detect the position of the rail of the ladle on the transport carriage Match the center of the means In so that, out of the travel command to the transport carriage, in which characterized in that a control device for correcting the stop position of the transport vehicle.

  According to this invention, even when the ladle is not on the center of the transport carriage, the ladle rail always coincides with the center of the roller of the roller table as a relay ladle transport means, so the ladle is Smoothly transferred from the transport carriage to the roller table.

  A stop positioning apparatus for a ladle transport carriage according to the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view showing a stop position of the transport cart when the ladle is placed on the center of the transport cart, and FIG. 2 is a stop of the transport cart when the ladle is placed on the right side of the transport cart. 3 is a plan view showing the position, FIG. 3 is a plan view showing a stop position of the transport cart when the ladle is placed on the left side of the transport cart, and FIG. 4 is a plan view showing the ladle on the right side of the transport cart. It is a top view which shows the state in which the front-end | tip of a rail hits a roller table.

  1 to 4, the same reference numerals as those in FIGS. 5 to 9 denote the same components. That is, 6 is a transport cart on which the ladle 2 is placed, 11 is a roller table provided on the transport cart 6, and a plurality of rollers 12 arranged in two rows having a recess at the center. It is made up of. 16A is a roller table as a ladle transfer means for relay, 17 is a pair of rails fixed to the bottom surface of the ladle 2, and the center of the rail 17 coincides with the center (O) of the ladle 2 Yes. Reference numeral 20 denotes position detection means provided on the transport carriage 6. The position detection means 20 includes a laser type distance detector and the like, and detects the position of the ladle 2 on the transport carriage 6.

  As shown in FIG. 1, when the rail 17 of the ladle 2 is placed on the center of the roller 12 of the roller table 11, the ladle 2 is smoothly transferred from the transport carriage 6 to the roller table 16 </ b> A. At this time, the center (O) of the ladle 2 coincides with the center of the transport carriage 6 (indicated by a two-dot chain line in FIG. 1) and the center of the roller table 16A (indicated by a one-dot chain line in FIG. 1). .

  On the other hand, as shown in FIG. 2, even when the rail 17 of the ladle 2 is put on the right side of the roller 12 of the roller table 11, the center of the transport carriage 6 coincides with the center of the roller table 16A. Stop at position. Therefore, in this case, as shown in FIG. 4, since the tip of the rail 17 of the ladle 2 collides with the roller 12 of the roller table 16A, the ladle 2 cannot be transferred and the line is temporarily stopped. I have to do it.

In this invention, the position detection means 20 detects the position of the ladle 2 on the conveyance carriage 6, that is, the distance between the position detection means 20 and the ladle 2. In the case of Figure 2, this distance increases to the steady state from (L ₀ in Fig. 1) (L _1), a controller (not shown), position data (L in this ladle rail Based on ₁ ), a travel command is issued to the transport carriage 6 so that the center (O) of the ladle 2 coincides with the center of the roller table 16A, and the stop position of the transport carriage 6 is corrected.

  As a result, since the center (O) of the ladle 2 and the center of the roller table 16A coincide, the ladle 2 is smoothly transferred from the transport carriage 6 to the roller table 16A.

  Moreover, as shown in FIG. 3, even when the rail 17 of the ladle 2 is put on the left side of the roller 12 of the roller table 11, the center of the transport carriage 6 coincides with the center of the roller table 16A. Stop at position. Therefore, also in this case, the tip of the rail 17 of the ladle 2 collides with the roller 12.

In this case, the distance is shortened during steady from (L ₀₎ to (L _2), a controller (not shown) on the basis of the position data of the ladle of the rail (L _2), A travel command is issued to the transport carriage 6 so that the center (O) of the ladle 2 matches the center of the roller table 16A, and the stop position of the transport carriage 6 is corrected.

  As a result, since the center (O) of the ladle 2 and the center of the roller table 16A coincide, the ladle 2 is smoothly transferred from the transport carriage 6 to the roller table 16A.

  Thus, according to this invention, the rail 17 of the ladle 2 is always a roller table as a ladle transfer means for relay regardless of the mounting position of the ladle 2 on the roller table 11 of the transport carriage 6. Since it coincides with the center of the roller 12 of 16A, the ladle 2 is smoothly transferred from the transport carriage 6 to the roller table 16A. As a result, problems such as line stop due to the rail 17 colliding with the roller 12 do not occur.

It is a top view which shows the stop position of a conveyance trolley when a ladle is put on the center of a conveyance trolley. It is a top view which shows the stop position of a conveyance trolley when a ladle is put on the right side of a conveyance trolley. It is a top view which shows the stop position of a conveyance trolley when a ladle is put on the left side of a conveyance trolley. It is a top view which shows the state in which the front-end | tip of a rail hits a roller table when a ladle is put on the right side of a conveyance trolley. It is a schematic plan view which shows a prior art. It is a side view which shows the conveyance trolley on which the ladle was put. It is a top view which shows a conveyance trolley | bogie. It is a side view which shows the roller table as a ladle transfer means for relays in which the ladle was put. It is a top view which shows the roller table as a ladle transfer means for a relay.

Explanation of symbols

1: Holding furnace 2: Ladle 3: Graphite spheroidizing device 4: Waste disposal device 5: Rail 6: Carriage cart 7: Waste station 8: Waste pot 9: Drive 10: Wheel 11: Roller table 12: Roller 13: Electric motor 14: Reducer 15: Transmitter 16A-16C: Roller table 17: Rail 18: Laser sensor 19: Overhead conveyance cart 20: Position detector

Claims (2)

A ladle is placed on a trolley side ladle transfer means provided on a transport trolley and capable of transporting the ladle in a direction orthogonal to the travel direction of the transport trolley, and the transport trolley is placed in the travel direction of the transport trolley. Traveling to the ladle transfer means for relay provided in an orthogonal direction, and stopping the transport carriage when transferring the ladle on the cart side ladle transfer means to the relay ladle transfer means In the positioning method,
The carriage side ladle transfer means and the relay ladle transfer means comprises a roller table capable of feeding a ladle through a rail provided on the lower surface of the ladle, the ladle on the conveyance carriage The position of the rail is detected by a laser-type distance detector, and the stop position of the transport carriage is corrected so that the center of the ladle coincides with the center of the relay ladle transfer means. Stop positioning method for pan transport cart. A ladle is placed on a trolley side ladle transfer means provided on a transport trolley and capable of transporting the ladle in a direction orthogonal to the travel direction of the transport trolley, and the transport trolley is placed in the travel direction of the transport trolley. Traveling to the ladle transfer means for relay provided in an orthogonal direction, and stopping the transport carriage when transferring the ladle on the cart side ladle transfer means to the relay ladle transfer means In the positioning device,
  The trolley side ladle transfer means and the relay ladle transfer means are composed of a roller table capable of transporting the ladle via a rail provided on the lower surface of the ladle, and the ladle on the transport trolley Based on the position data of the rail by the position detection means comprising a laser-type distance detector for detecting the position of the rail, the transport so that the center of the ladle coincides with the center of the relay ladle transfer means. A stop positioning device for a ladle transport carriage, comprising: a controller that issues a travel command to the carriage and corrects the stop position of the transport carriage.

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