JP4814168B2 - Molten metal transfer system - Google Patents

Description

  The present invention relates to a molten metal transport system for safely and efficiently transferring molten metal to a molding plant.

  Conventionally, a molten metal supply system as described in Patent Documents 1 to 3 is known. These molten metal supply systems target, for example, molten aluminum as a molten metal, and transfer the molten aluminum from a first factory, which is a molten aluminum supply source, to a second factory equipped with a die cast machine. To do. In such a supply system, a container capable of containing molten aluminum is adopted, and in a state where molten aluminum is poured into the container at the first factory, the container is transferred to the second factory by a truck. Then, the molten aluminum in the container transferred to the second factory is transferred to a holding furnace, and then supplied from the holding furnace to a die cast machine to be subjected to a predetermined forming process.

According to such a molten metal supply system, in particular, a molten metal line is directed to a second factory having a die-cast machine located at a position where aluminum melted in the first factory is isolated from the first factory. Since it can be sent by truck without laying, it is not necessary to provide an expensive molten metal line, which can contribute to the reduction in equipment costs and can transport molten metal anywhere. Therefore, the molten metal transport system is highly versatile.
JP 2003-305562 A JP 2004-001094 A JP 2007-083312 A

  By the way, in the molten metal supply system described in Patent Documents 1 to 3, the truck is reciprocated between the first factory and the second factory, and in the first factory, molten aluminum is supplied to the truck bed. While the filled containers are loaded, the so-called piston operation is performed in the second factory, in which a full container is unloaded from the truck bed, an empty container is loaded and returned to the first factory.

  However, if the truck is to perform such a piston operation, the first factory must have a container filled with molten aluminum waiting at the truck arrival / departure point in time for the arrival of the truck. Similarly, in the second factory, not only the preparation for the molding operation by the die-casting machine must be set in time for the arrival of the truck, but also an empty container must be kept waiting. Therefore, the first and second factories must carry out production activities in accordance with the operation of these trucks, which makes it impossible to develop reliable and safe production activities with a margin. Have.

  In addition, it is preferable to use at least two trucks for transporting containers between the first and second factories in order to eliminate idle time and improve the efficiency of transportation work. Not only does the cost of the truck increase, but two drivers are required, and the labor cost and running cost also increase (that is, the fixed cost and the variable cost impose a cost).

  In addition, although the truck bed has been modified to have a heat-resistant specification so that it can be used for transporting containers filled with high-temperature molten metal, the basic structure of the bed is the same as that of ordinary trucks. Therefore, when loading / unloading containers on / from the truck bed, it must be done using a work machine such as a forklift with the truck stopped in the work area, which is not only inferior in workability. However, it has a problem that much work time is required.

  As described above, in the molten metal supply system described in Patent Documents 1 to 3, transfer efficiency by piston operation for container transfer using a truck (specifically, a unit per truck) Not only is the number of containers transported per hour and the transportation cost inferior, but there are many problems to be solved such as the fact that it is difficult to carry out reliable and reliable production activities on the factory side, the workability of cargo handling work is inferior, and the work cost increases. It is the actual situation.

  The present invention has been made in view of such a conventional situation. The first and first aspects of the present invention can be achieved safely while ensuring good workability of the cargo handling work while greatly improving the transfer efficiency. It is an object of the present invention to provide a molten metal transport system capable of reciprocating a container filled with molten metal and an empty container between two factories by a piston operation.

The invention according to claim 1 (molten metal transport system) transfers the molten metal to a heat-resistant container from a first factory that prepares the molten metal to a second factory that manufactures a predetermined product using the molten metal. In a molten metal transport system in which a heat-resistant container that has been emptied is returned from the second factory to the first factory, the transport is reciprocated between the first and second factories. A vehicle and a pallet that is held by the transport vehicle when the transport vehicle moves backward, and is removed from the transport vehicle when the transport vehicle moves forward, and the pallet is lifted in a state of being held by the transport vehicle. is a integrally drivable mounting state and transport vehicle by being up, the heat-resistant container, a container body having an opening on the upper surface of thermal insulation on the inner surface of the steel shell material is lined, in the container body A lid body with a heat insulating material lined on the inner surface for closing the surface opening, and provided with a locking means for locking the closed state of the lid body in a state where the lid body covers the upper surface opening of the container body, The container body is protruded outward at an equal pitch in the circumferential direction from the outer peripheral surface of the upper edge portion and at least two guided ridges that are parallel to each other and protruded outward on the bottom surface. The pallet is provided with a guide protrusion into which the guided protrusion is fitted, and the guided protrusion has a lower edge portion. The guide projections are provided with inclined edge surfaces of the guided ridges on opposite surfaces of the guide projections. An upwardly inclined guiding inclined surface that is guided and placed is formed Inclination angle relative to the horizontal plane of the inclined edge surface is characterized in that it is set to be the same as the inclination angle of the guide inclined surfaces.

  According to the molten metal transport system having such a configuration, the molten metal prepared in the first factory is transported toward the second factory by the transport vehicle in a state of being filled in the heat-resistant container, and in the second factory. Predetermined product treatment is performed. Then, the heat-resistant container emptied in the second factory is returned to the first factory by the transport vehicle, and the returned heat-resistant container is used for filling a new molten metal. Therefore, the molten metal in the first factory is semi-continuously transferred to the second factory by piston-operating (reciprocating operation) between the first and second factories and catching the heat-resistant container between them. In the second factory, a predetermined product using molten metal as a raw material is appropriately manufactured without running out of the raw material.

  The transport vehicle that is reciprocated between the first and second factories has a pallet configured to hold the heat-resistant container in a stable state, and this pallet is transported by the forward and backward movement of the transport vehicle. It is designed to be detachably attached to the vehicle.

  Accordingly, one pallet is placed in each of the first and second factories and one is mounted on the transport vehicle, thereby adopting a total of three pallets, so that the first factory In this case, a heat-resistant container filled with molten metal can be loaded on a pallet arranged in a predetermined work area in a state independent of the operation of the transport vehicle, and the transport vehicle can also be used in the second factory. It becomes possible to load an empty heat-resistant container on a pallet arranged in a predetermined work area in a state independent of the operation of the above.

  Therefore, one transport vehicle is operated as a piston between the first and second factories, and the molten metal is transferred from the first factory to the second factory by transshipping only the pallet to the transport vehicle at each factory. Since it becomes possible to carry in, it is not necessary to adopt a plurality of transport vehicles to realize efficient transfer as in the past, which can contribute to the reduction of equipment cost and operation cost. .

Moreover, in each factory, a heat-resistant container is loaded on a pre-arranged pallet without being restricted by the operation schedule of the transport vehicle (that is, even when the transport vehicle is not actually located in the work area). As a result, production activities at each factory are constrained by the operation schedule of the transport vehicle, preventing the occurrence of inconvenience that greatly restricts the degree of freedom. It is possible to carry out appropriate production activities.
In addition, when the molten metal is filled in the container body of the heat-resistant container, the upper surface opening is closed with a lid, and the lid is surely prevented from being locked by locking means. The occurrence of inconvenience such as leakage of the molten metal inside is reliably prevented.
In order to mount the heat-resistant container on the pallet, for example, a hook is hung on the suspension protrusion, the heat-resistant container is lifted by a crane or the like, and the heat-resistant container is suspended from a position directly above the pallet. By doing so, the two guided ridges provided at the bottom of the heat-resistant container are guided between the guide inclined surfaces formed on the pair of guide protrusions on the pallet, and are fitted between the guide protrusions. The heat-resistant container is mounted on the pallet in a stable positioning state.

The invention according to claim 2 is the invention according to claim 1, wherein the pallet includes a holding member for holding a heat-resistant container loaded on the pallet, and the holding member is provided on the bottom plate of the pallet. A strut erected at an intermediate position between the guide protrusions, a semicircular arm projecting from the strut, and a pair of arc-shaped arms extending rotatably from each tip of the semicircular arm A lock fitting provided on the distal end side of each arcuate arm, wherein the lock fitting has the arcuate arm in a state where the heat-resistant container is held by the semicircular arm and the pair of arcuate arms. is shall be and characterized in that the lock so that it does not open.
The invention according to claim 3 is the invention according to claim 1 or 2, wherein the transport vehicle has a U-shape in a plan view for mounting the pallet at a rear position thereof, and the rear end is A pair of support rails for supporting both side edges of the pallet in the vehicle width direction formed on opposing surfaces in the vehicle width direction, the pallet mounting portion having a container mounting space in an open state; And a rail elevating mechanism for elevating and lowering the pair of support rails.

According to the third aspect of the present invention , when the pallet is mounted in the container mounting space of the transport vehicle, the pair of support rails are lowered to the lower position by driving the rail lifting mechanism, and the predetermined work area is set. When the transport vehicle is moved backward straight toward the pallet placed on the pallet, the side edges of the pallet in the vehicle width direction are respectively supported by the pair of rails. When the pair of rails are raised by driving the rail lifting mechanism in this state, the pallet is mounted in the container mounting space in a state where each side edge portion is supported by the support rail and is lifted from the ground.

  On the other hand, when unloading the pallet mounted in the container mounting space of the transport vehicle, the pair of support rails are lowered by driving the rail lifting mechanism, and the pallet supported by the support rail is moved to the ground in the work area. Take it down. By doing so, both side edges of the pallet are removed from the support of the support rail. By continuing to advance the transport vehicle straight, only the transport vehicle moves away from the pallet while the pallet remains in the work area, and the unloading of the pallet is completed.

  In this way, the lifting and lowering of the support rail and the advance and retreat of the transport vehicle with respect to the pallet can make it very easy to load and unload the pallet onto the transport vehicle. In addition, the workability of unloading work is greatly improved compared to the conventional cargo handling work using a forklift.

According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the pallet is erected from at least a metal bottom plate on which the heat-resistant container is placed and a peripheral portion of the bottom plate. And a metal waist plate having a predetermined vertical dimension.

  According to such a configuration, even if high-temperature molten metal leaks from the heat-resistant container mounted on the pallet and is scattered on the pallet, the bottom of the pallet and the waist plate are made of metal. The occurrence of inconvenience is effectively prevented.

According to a fifth aspect of the present invention, in the invention according to any one of the first to fourth aspects, the pallet is mounted with a gas cylinder filled with an inert gas, and the gas cylinder is a molten metal from the heat-resistant container. When the gas is leaked, the inert gas is released.

  According to such a configuration, when a high-temperature molten metal leaks from the heat-resistant container, the inert gas is released from the gas cylinder mounted on the pallet, and this causes an inert gas atmosphere on the pallet. Even if an object is present, the occurrence of inconvenience that the combustible material burns is reliably prevented.

  According to the molten metal transport system of the present invention, at least one pallet is arranged in each of the first and second factories and one is mounted on the transport vehicle, thereby at least a total of three pallets. By adopting this pallet, in the first factory, it is possible to load a heat-resistant container filled with molten metal on the pallet placed in a predetermined work area in a state independent of the operation of the transport vehicle. At the same time, the empty heat-resistant container can be loaded on the pallet arranged in the predetermined work area in a state independent of the operation of the transport vehicle.

  Therefore, one transport vehicle is operated as a piston between the first and second factories, and the molten metal is transferred from the first factory to the second factory by transshipping only the pallet to the transport vehicle at each factory. Since it becomes possible to carry in, it is not necessary to adopt a plurality of transport vehicles to realize efficient transfer as in the past, which can contribute to the reduction of equipment cost and operation cost. .

  Moreover, in each factory, a heat-resistant container is loaded on a pre-arranged pallet without being restricted by the operation schedule of the transport vehicle (that is, even when the transport vehicle is not actually located in the work area). As a result, production activities at each factory are restricted by the operation schedule of the transport vehicle, and the inconvenience that greatly restricts the degree of freedom is prevented. As a result, each factory has a margin. Therefore, it is possible to carry out appropriate production activities with appropriate safety considerations, and as a result, it can contribute to the improvement of the corporate image.

  FIG. 1 is an explanatory view in a side view for explaining an outline of a molten metal transport system 10. As shown in FIG. 1, a molten metal transport system 10 according to the present invention includes a molten aluminum AL from an aluminum melting factory (first factory) 11 that obtains a predetermined metal (aluminum in the present embodiment) in a molten state. In a state where the heat-resistant container 20 is filled, the aluminum molding factory (second factory) 12 is fed through a public road 13 and the aluminum molding factory 12 uses the molten aluminum AL as a raw material and a predetermined aluminum product by a die casting machine. And the empty heat-resistant container 20 is returned to the aluminum melting plant 11.

  The molten metal transfer system 10 includes a transfer vehicle 30 that is reciprocally operated in a piston state between an aluminum melting factory 11 and an aluminum forming factory 12, and a heat-resistant, removably attached to the transfer vehicle 30 as the transfer vehicle 30 advances and retreats. It has a basic configuration including a pallet 40 that can hold the container 20 in a stable state.

  The heat-resistant container 20, the transport vehicle 30, and the transport vehicle 30 will be described in detail later with reference to FIGS. 7 to 10. Here, it is necessary for the description of the molten metal transport system 10 based on FIGS. The conveyance vehicle 30 will be described within the range. 1 to 4, the heat-resistant container 20, the transport vehicle 30 and the pallet 40, the melting factory-side transshipment work area 111 and the molding factory-side transshipment work area 121 are replaced with the aluminum melting factory 11 and the aluminum molding. Compared with the factory 12, it is greatly exaggerated.

  The heat-resistant container 20 is filled with molten aluminum prepared by melting at the aluminum melting factory 11, and as shown in FIG. 1, a cylindrical container body 21 and an upper surface of the container body 21. And a lid body 22 for closing the opening. In the aluminum melting factory 11, after a predetermined melting process is performed on the raw material aluminum, the container body 21 is filled with the molten aluminum.

  Then, the heat-resistant container 20 in a state where the molten aluminum is filled in the container main body 21 and the upper surface opening thereof is closed by the lid body 22 is transported through the premises of the aluminum melting factory 11 by a work machine (not shown). Is placed on a pallet 40 that is arranged in advance in a melting factory side transshipment work area 111 provided at an appropriate position. The heat-resistant container 20 placed on the pallet 40 is transported by the transport vehicle 30 together with the pallet 40 to the aluminum forming factory 12.

  The transport vehicle 30 includes a tractor 31 that is capable of self-propelling with an engine, and a trailer 32 that is pulled by the tractor 31. The trailer 32 has a pallet mounting part (container mounting space) 320 (see FIGS. 8 and 9) on which the pallet 40 can be mounted, and a vehicle that can raise and lower the pallet 40 mounted on the pallet mounting part 320. A height changing means (rail elevating mechanism) 34 is provided. The pallet mounting portion 320 has a rear end surface opened.

  Accordingly, with the pallet 40 placed in the melting factory side transshipment work area 111, the rear opening of the pallet mounting portion 320 of the trailer 32 is opposed to the end of the pallet 40, and the transport vehicle 30 is moved backward. The pallet 40 is fitted into the pallet mounting part 320 of the trailer 32. In this state, the pallet 40 can be loaded onto the trailer 32 by raising the pallet 40 by driving the vehicle height changing means 34.

  Conversely, when unloading the pallet 40 on which the transport vehicle 30 is loaded, the pallet 40 is lowered to the ground by driving the vehicle height changing means 34 while the transport vehicle 30 is stopped at a predetermined unloading position. Then, the transport vehicle 30 may be continuously advanced. By doing so, the pallet 40 is left on the ground and unloading is completed.

  The pallet 40 includes a metal bottom plate 41 having a long and narrow rectangular shape in plan view, and a metal waist plate 42 erected from the periphery of the bottom plate and having a predetermined vertical dimension. By doing so, even if molten aluminum leaks from the heat-resistant container 20 during transportation, a fire does not occur. Various other safety measures are also taken, which will be described later.

  Hereinafter, based on FIGS. 2-4, the effect | action of the molten metal conveyance system 10 is demonstrated. 2-4 is explanatory drawing of the planar view for demonstrating each process of molten aluminum conveyance in the molten metal conveyance system 10, FIG.2 (A) is the conveyance vehicle 30 immediately after the start of operation in the aluminum melting factory. 2B is a state where the pallet 40 in which the heat-resistant container 20 containing molten aluminum is mounted on the trailer 32 of the transport vehicle 30 is being loaded, and FIG. FIG. 3B shows a state in which the pallet 40 loaded with the heat-resistant container 20 containing molten aluminum is mounted on the trailer 32 of the transport vehicle 30 in the factory-side transshipment work area 111, and FIG. FIG. 4A arrives at the transshipment work area 121 on the molding factory side, with the heat-resistant container 20 placed and traveling toward the aluminum molding factory 12. FIG. 4B shows a state where the pallet 40 is being unloaded from the trailer 32 of the vehicle 30. FIG. 4B shows a pallet 40 loaded with an empty heat-resistant container 20 prepared in advance in the molding factory side transshipment work area 121. The state which is being loaded in 30 trailers 32 is shown, respectively.

  First, in the present embodiment, three pallets 40 are employed, and these three pallets 40 are arranged between the transport vehicle 30, the melting factory side transshipment work area 111, and the molding factory side transshipment work area 121. Thus, the molten aluminum in the aluminum melting factory 11 can be efficiently conveyed to the aluminum forming factory 12 using only one conveying vehicle 30.

  First, when the aluminum melting factory 11 and the aluminum forming factory 12 start operations, as shown in FIG. 2A, one of the three pallets 40 is an empty heat-resistant container 20. The pallet 40 loaded with the empty heat-resistant container 20 is mounted on the transport vehicle 30. The remaining two pallets 40 are arranged in the melting factory-side transshipment work area 111 and the molding factory-side transshipment work area 121, respectively.

  And the pallet 40 arrange | positioned in the melting factory side transshipment work area 111 is loaded with the predetermined number of the heat-resistant containers 20 in a state where the aluminum forming factory 12 is melted and the heat-resistant containers 20 are filled with molten aluminum. As a result, the pallet 40 is placed in a standby state. In addition, the heat-resistant container 20 filled with molten aluminum is shown by the sketch. On the other hand, an empty heat-resistant container 20 is loaded in advance on the pallet 40 arranged in the molding factory side transshipment work area 121.

  In this state, the transport vehicle 30 enters the aluminum melting factory 11 in which the pallet 40 in the standby state is arranged, and then lowers the loaded pallet 40 to the melting factory-side transshipment work area 111, and continues to FIG. ) And FIG. 2 (B), the vehicle moves backward toward the end of the pallet 40 as indicated by an arrow. As a result, as shown in FIG. 3 (A), the pallet 40 on which the heat-resistant container 20 containing molten aluminum is loaded is mounted on the pallet mounting portion 320 of the trailer 32 in the melting factory side transshipment work area 111. Become. Thereafter, the pallet 40 is lifted from the ground by driving the vehicle height changing means 34. As a result, the transport vehicle 30 can travel while holding the pallet 40.

  Next, as shown in FIG. 3B, the transport vehicle 30 exits the melting factory side transshipment work area 111, travels on the public road 13, and heads toward the molding factory side transshipment work area 121. The empty pallet 40 unloaded from the transport vehicle 30 in the melting factory side transshipment work area 111 until the transport vehicle 30 returns from the molding factory side transshipment work area 121 is filled with molten aluminum. The heat-resistant container 20 is loaded.

  When the transport vehicle 30 reaches the molding factory side transshipment work area 121, the pallet 40 mounted on the trailer 32 is lowered by driving the vehicle height changing means 34 and reaches the ground. As shown in FIG. 4, the transport vehicle 30 is moved forward, whereby the pallet 40 loaded with the heat-resistant container 20 containing molten aluminum is unloaded to the molding factory-side transshipment work area 121.

  Subsequently, as shown in FIG. 4B, the transport vehicle 30 moves backward toward the pallet 40 on which the empty heat-resistant container 20 previously placed on the molding factory side transshipment work area 121 is mounted. Thus, the pallet 40 is taken into the pallet mounting portion 320 of the trailer 32, and the heat-resistant container 20 is mounted on the trailer 32 so that the pallet 40 can be moved by raising the pallet 40 by driving the vehicle height changing means 34. As a result, the transport vehicle 30 loaded with the empty heat-resistant container 20 can travel toward the melting factory side transshipment work area 111.

  The heat-resistant container 20 containing molten aluminum on the pallet 40 unloaded in the molding factory-side transshipment work area 121 is transferred into the aluminum molding factory 12 by a predetermined working machine on the aluminum molding factory 12 side. The molten aluminum in 20 is supplied to a predetermined die casting machine and subjected to a forming process.

  Then, the heat-resistant container 20 that has been emptied is returned to the pallet 40 that has been sent in earlier, and as shown in FIG. It will be returned to the replacement work area 111. Thereafter, the steps of FIG. 2A to FIG. 4B are repeated, so that the molten aluminum melted in the aluminum melting factory 11 is transferred between the aluminum melting factory 11 and the aluminum forming factory 12 of the transport vehicle 30. By the operation of the piston in the meantime, it is efficiently sent to the aluminum forming factory 12.

  Hereinafter, the heat-resistant container 20 will be described in detail with reference to FIGS. 5 and 6. FIG. 5 is a partially cutaway perspective view showing an embodiment of the heat-resistant container 20, and FIG. 6 is a sectional view taken along the line VI-VI. As shown in these drawings, the heat-resistant container 20 has a container body 21 having a bottomed cylindrical shape and a planar shape that closes the upper surface opening of the container body 21 and has the same circular shape as that of the container body 21. And a basic structure having a lid body 22.

  The container main body 21 includes a main body side iron skin 211 made of a metal material such as stainless steel, and a main body side heat insulating material 212 made of mortar or the like lined on the inner surface side of the main body side iron skin 211. The lid 22 also includes a lid side iron skin 221 made of a metal material such as stainless steel, and a lid side heat insulating material 222 made of mortar or the like lined on the inner surface side of the lid side iron skin 221. In the state where the lid body 22 is attached to the container body 21 and the heat resistant container 20 is formed, the molten aluminum filled in the heat resistant container 20 is prevented from radiating heat due to the presence of these heat insulating materials 212 and 222. Can indicate the molten state for a long time.

  The container main body 21 is provided with a main body side flange 213 projecting radially outward from the upper edge of the main body side iron shell 211 over the entire circumference. A lid-side flange 223 is provided so as to project outward in the radial direction from the upper edge of the lid-side iron skin 221 over the entire circumference. A plurality of bolts (locking means) B are penetrated at equal pitches in the circumferential direction through the main body side and the lid body side flanges 213 and 223 that are in contact with each other in a state where the lid body 22 is mounted on the container main body 21. By being screwed and fastened, the tight contact state of the lid 22 with the container main body 21 is ensured, and thereby it is possible to reliably prevent the molten aluminum inside from leaking through the gap between the two.

  In addition, the container body 21 is provided with an annular band 23 which is the uppermost part on the outer surface side of the body side heat insulating material 212 and is wound around in a headband shape at a position directly below the body side flange 213. At the point-symmetrical positions of the annular band 23 in plan view, suspension protrusions 231 that protrude outward in the radial direction are provided. The heat-resistant container 20 is configured to be attached to and detached from the pallet 40 from above by engaging hooks of a working machine (not shown) with these suspension protrusions 231.

  Furthermore, the container body 21 is provided with two guided ridges 24 that are parallel to each other and project downward from the bottom of the body side iron shell 211. These guided ridges 24 are mounted while being guided between a pair of guide rails (guide protrusions) 43 (to be described later) of the pallet 40, whereby the heat-resistant container 20 is mounted on the pallet 40 in a positioned state. Is done.

  Each of the guided ridges 24 has inclined edge surfaces 241 extending over the entire length in the longitudinal direction inclined in a downward direction toward each other in an opposite direction when viewed from the end surface at the lower edge portion. The surface 241 is guided by the inclined surface of the inclined portion 432 formed on the opposing surface of the guide rail 43, so that the heat-resistant container 20 is reliably positioned on the pallet 40.

  The lid 22 has an aluminum intake / exhaust pipe 25 for sucking molten aluminum provided at a position away from the center position by a predetermined distance into the heat-resistant container 20 and discharging it from the heat-resistant container 20 to the outside, A gas intake / exhaust pipe 26 is provided for press-fitting compressed gas into the heat-resistant container 20 provided at the center position or sucking the gas in the heat-resistant container 20. The length of the aluminum intake / exhaust pipe 25 in the container body 21 is set so that the lower end portion in the container body 21 is positioned immediately above the bottom of the container body 21.

  The gas intake / exhaust pipe 26 can be connected to a pump pipe P <b> 1 of a vacuum pump P at a tip outside the heat-resistant container 20. Then, the vacuum pump P is driven to suck the gas in the heat-resistant container 20 through the gas intake / exhaust pipe 26 and the pump pipe P1 (arrow a in FIG. 6), thereby melting in a predetermined melting furnace in the aluminum melting factory 11. While aluminum is sucked into the heat-resistant container 20 through the aluminum intake / exhaust pipe 25, the gas from the predetermined gas source P2 is supplied into the heat-resistant container 20 through the pump pipe P1 and the gas intake / exhaust pipe 26 by reverse driving of the vacuum pump P. The molten aluminum in the heat-resistant container 20 is discharged to the outside through the aluminum intake / exhaust pipe 25 by being press-fitted into the heat-resistant container 20.

  Incidentally, the work of filling the heat-resistant container 20 with molten aluminum by suction of gas by driving the vacuum pump P is performed in the aluminum melting factory 11, and conversely, the molten aluminum in the heat-resistant container 20 is discharged from the heat-resistant container 20. The work is performed in the aluminum molding factory 12, and molten aluminum is not sucked into or discharged from the heat-resistant container 20 while the heat-resistant container 20 is being transported by the transport vehicle 30.

  Hereinafter, the transport vehicle 30 will be described in detail with reference to FIGS. FIG. 7 is an explanatory view in a side view showing an embodiment of the transport vehicle 30 used in the present invention. FIG. 7 (A) shows a state where the trailer 32 is raised, and FIG. 7 (B) shows the trailer 32. Each shows a state in which is lowered. 8 is a rear view of the transport vehicle 30 shown in FIG. 7. FIG. 8A shows a state where the trailer 32 is raised, and FIG. 8B shows a state where the trailer 32 is lowered. Yes.

  First, as shown in FIGS. 7 and 8, the transport vehicle 30 includes a tractor 31 that can self-propell and a trailer 32 that is detachably connected to the tractor 31. The tractor 31 has a chassis 311 having four wheels. A cab 312 is provided at a front position (left side in FIG. 7) of the chassis 311 and a trailer 32 is connected to the rear position. A connecting table 313 is provided.

  The connection table 313 includes a lower connection table 313a having a truncated cone shape and an upper connection table 313b supported on the top of the lower connection table 313a so as to be rotatable about a vertical axis 313c. The upper connection base 313b is formed obliquely rearward and upward from the vertical shaft 313c. The trailer 32 is coupled to the upper coupling base 313b, whereby the tractor 31 and the trailer 32 can be relatively rotated around the vertical axis 313c on the road surface.

  The trailer 32 is provided with three pairs of driven wheels 33 in the width direction at appropriate positions. Further, the trailer 32 is provided with a vehicle height changing means 34 to be described later for raising and lowering the vehicle body by allowing the driven wheels 33 to enter and exit the vehicle body. The trailer 32 has a pair of connecting rods 321 in the width direction projecting forward from the upper part of the vehicle body, and a front vehicle height changing means 35 is interposed between the connecting rod 321 and the connecting table 313. Yes.

  The front vehicle height changing means 35 is connected to the rear end portion of the upper coupling base 313b so that the rear end portion thereof can freely rotate about the horizontal axis, and the front end portion rotates about the horizontal axis to the front end portion of the connecting rod 321. An intermediate member 351 that is movably connected, and a hydraulic cylinder 352 that is attached to the distal end side of the connecting rod 321 are provided.

  The piston rod 353 of the hydraulic cylinder 352 has its tip end abutted against the upper surface of the tip end portion of the upper coupling base 313b. Accordingly, when the piston rod 353 is projected by driving the hydraulic cylinder 352 in conjunction with the vehicle height changing means 34, the connecting rod 321 is moved by the reaction force of the piston rod 353 as shown in FIG. While the trailer 32 is located at the upper position by raising the protrusion amount, the connecting rod 321 is moved as shown in FIGS. 7 and 8 by immersing the piston rod 353 by reverse driving of the hydraulic cylinder 352. As a result, the trailer 32 is positioned at the lower position.

  FIG. 9 is a perspective view showing an embodiment of the trailer 32. As shown in this figure, the trailer 32 is formed with a driven wheel 33 provided in a rectangular parallelepiped vehicle body in appearance. The vehicle body has a U-shape in a plan view, and a pair of side walls 32a in the width direction, a front wall 32b bridged between the front edges of the side walls 32a, and a direction opposite to each other from the lower edge of each side wall 32a. It is composed of a pair of widthwise support edge portions (support rails) 32c extending in the front-rear direction. The vehicle height changing means 34 is housed inside the side wall 32a, and the driven wheel 33 is also housed inside the side wall 32a so that the amount of protrusion can be changed with the lower portion protruding outside.

  A pallet mounting portion 320 that is a space for storing the pallet 40 holding the heat-resistant container 20 is formed in a space surrounded by the side wall 32a and the front wall 32b of the trailer 32, and between the pair of support edge portions 32c. A gap 320a through which the pallet 40 passes is formed. The pallet 40 has a width dimension slightly smaller than the inner dimension between the support edges 32c of the side wall 32a, and a pair of supported edge portions 441 extending in the front-rear direction by both side edges in the width direction. Yes.

  Therefore, by inserting the pallet 40 on which the heat-resistant container 20 is placed into the gap 320a between the support edges 32c, the pair of supported edges 441 are supported by the pair of support edges 32c, and the pallet 40 is attached to the vehicle body. As a result, the heat-resistant container 20 is loaded in the pallet mounting portion 320 of the vehicle body.

  And the handling of the pallet 40 with respect to the trailer 32 is performed by advancing and retracting the tractor 31 with the trailer 32 positioned at the lowered position. Specifically, when the heat-resistant container 20 is mounted on the trailer 32, first, the pallet 40 on which the heat-resistant container 20 is placed is placed on the ground, and then the trailer 32 is moved backward by driving the tractor 31, and (B) of FIG. ), The part below the supported edge 441 of the pallet 40 is fitted into the gap 320a between the support edges 32c of the trailer 32. Then, by driving the vehicle height changing means 34, the trailer 32 is raised and positioned at the raised position, whereby the heat-resistant container 20 placed on the pallet 40 is moved to the pallet of the trailer 32 as shown in FIG. It will be in the state with which the mounting part 320 was mounted | worn.

  Conversely, when unloading the heat-resistant container 20 in the state shown in FIG. 8A loaded on the trailer 32, the trailer 32 is lowered by driving the vehicle height changing means 34, and FIG. As shown in FIG. 4, after the bottom surface of the pallet 40 is brought into contact with the ground, the tractor 31 may be driven to advance the trailer 32. If it does so, only the pallet 40 will remain on the ground where it was lowered, and the heat-resistant container 20 on the pallet 40 will be unloaded from the trailer 32.

  FIG. 10 is an explanatory view showing an embodiment of the vehicle height changing means 34. FIG. 10 (A) shows a state in which the trailer 32 is set to the raised position by the vehicle height changing means 34, FIG. 10 (B). These show the state where the trailer 32 is set to the same lowered position. As shown in FIG. 10, the vehicle height changing means 34 includes a cam 341 having a substantially isosceles triangle shape disposed in the side wall 32a of the vehicle body, and a cylinder device 342 for operating the cam 341.

  The cam 341 is positioned such that a triangular base extends in the front-rear direction (the left-right direction of the paper in FIG. 10) in a wheel storage space 340 surrounded by a predetermined frame in the side wall 32a. The cam 341 is pivotally supported around a cam support shaft 341a extending in the width direction (direction perpendicular to the paper surface of FIG. 10) at the front (left side of the paper surface in FIG. 10). A bearing 341b for receiving the axle 33a of the driven wheel 33 is provided at the rear corner. As a result, the driven wheel 33 of the trailer 32 can be moved in and out of the wheel storage space 340 by forward and reverse rotation of the cam 341 around the cam support shaft 341a.

  The cylinder device 342 includes a hydraulic cylinder 343 that is actuated by hydraulic pressure of hydraulic oil from a hydraulic unit (not shown) mounted at an appropriate position of the tractor 31 (FIG. 7), and a piston rod 344 that can be advanced and retracted relative to the hydraulic cylinder 343. It is made up of. The tip of the piston rod 344 is brought into contact with the upper front edge of the cam 341, and the cam 341 rotates forward and backward around the cam support shaft 341a by the advance and retreat of the piston rod 344, whereby the driven wheel 33 is moved. A projection state in which approximately one third of the vertical dimension protrudes outside from the wheel storage space 340 (FIG. 10A), and an immersion state in which most of the bottom dimension is immersed in the wheel storage space 340 (FIG. 10). (B)) can change state.

  Therefore, in the state where the piston rod 344 protrudes from the hydraulic cylinder 343 by driving the cylinder device 342, the driven wheel 33 protrudes from the wheel storage space 340 to the outside by the clockwise rotation of the cam 341 around the cam support shaft 341a. As shown in FIG. 10A, the trailer 32 is located at the raised position, and the cam 341 rotates counterclockwise around the cam support shaft 341a by pulling the piston rod 344 back to the hydraulic cylinder 343. The driven wheel 33 is immersed in the wheel storage space 340, and the trailer 32 is positioned at the lowered position as shown in FIG.

  Next, the pallet 40 will be described with reference to FIGS. 11 and 12. 11 and 12 are partially cutaway perspective views showing an embodiment of the pallet 40. FIG. 11 shows a state in which the heat-resistant container 20 is not loaded on the pallet 40, and FIG. 20 shows a loaded state.

  First, as shown in FIG. 11, the pallet 40 is formed of a metal, and has a bottom plate 41 having a rectangular shape in a plan view so that the pallet 40 can be mounted on the trailer 32 of the transport vehicle 30. A waist plate 42 erected from the periphery of 41 and having a vertical dimension set to be less than or equal to half of the vertical dimension of the heat-resistant container 20; and the heat resistance extending in the vehicle width direction projecting upward from the bottom plate 41 A plurality of guide rails 43 corresponding to the guided ridges 24 of the container 20 and a front-rear direction projecting downward from the back side of the bottom plate 41 so as to correspond to the pair of support edge portions 32c of the trailer 32 A pair of leg protrusions 44 extending in the width direction, and a holding member 45 for holding the heat-resistant container 20 to prevent the heat-resistant container 20 loaded on the bottom plate 41 from shaking.

  The waist plate 42 includes a pair of long waist plates 421 extending in the front-rear direction and a pair of short waist plates 422 extending in the width direction. By providing such a waist plate 42, even if molten aluminum leaks from the heat-resistant container 20 loaded on the pallet 40, the leaked molten aluminum is reliably prevented from flowing out on the bottom plate 41.

  The guide rails 43 receive a pair of guided ridges 24 of the heat-resistant container 20 as a pair opposed to each other. In the present embodiment, three pairs of guide rails 43 are provided on the bottom plate 41. The guide rail 43 is formed by bending a metal plate material by a press process along a fold line set so as to extend in the longitudinal direction, has a right triangle shape in a cross-sectional view, and stands vertically from the bottom plate 41. The vertical portion 431 is provided, and an inclined portion (guide inclined surface) 432 is provided so as to extend obliquely downward from the upper edge portion of the vertical portion 431.

  A pair of such guide rails 43 is employed so that the inclined portions 432 face each other with respect to one heat-resistant container 20. In the pair of guide rails 43, the inner dimension between the upper edge portions of the pair of inclined portions 432 is set longer than the outer dimension between the pair of guided protrusions 24 of the heat-resistant container 20. The inner dimension between the edge portions is shorter than the inner dimension between the guided protrusions 24. The inclination angle of the inclined edge surface 241 of the guided protrusion 24 with respect to the horizontal plane is set to be the same as the inclination angle of the inclined portion 432 of the guide rail 43.

  Therefore, when the heat-resistant container 20 is suspended on the pallet 40 while the guided protrusion 24 is adjusted to be parallel to the guide rail 43, the heat-resistant container 20 is slightly moved from the proper position in the front-rear direction of the pallet 40. Even if it is in a state of being deviated, the guided ridge 24 is guided on the inclined portion 432 of the guide rail 43, so that the misalignment is corrected and loaded on the pallet 40 as shown in FIG. Is done.

  The leg protrusion 44 is dimensioned such that the outer dimension in the width direction is shorter than the inner dimension between the pair of support edge portions 32c of the trailer 32, and the vertical dimension is set at the lower position. The size of the trailer 32 is set to be slightly thicker than the distance between the ground surface and the upper surface of the support edge portion 32c.

  A supported edge portion 441 that is supported by the support edge portion 32 c of the trailer 32 is formed on the outer side in the width direction of each leg protrusion 44 on the bottom plate 41. Accordingly, when the pallet 40 is placed on the ground, the transport vehicle 30 is moved straight back toward the pallet 40, so that each support edge 32c of the trailer 32 corresponds to a supported edge as shown in FIG. The pallet 40 enters a state where it can be supported by the pair of support edge portions 32c.

  The holding member 45 extends from the bottom plate 41 so as to extend along the one long waist plate 421, and the arm 45 extends from the upper portion of the column 451 to the other long waist plate 421. A projecting semicircular arm 452, a pair of arcuate arms 453 extending from each tip of the semicircular arm 452, and a lock provided on the tip side of each arcuate arm 453 And a metal fitting 454.

  The column 451 is erected on the side of one long waist plate 421 at an intermediate position between the pair of guide rails 43 that support the heat-resistant container 20. In the example shown in FIG. 11, three support columns 451 are provided on the bottom plate 41 corresponding to the three pairs of guide rails 43, but the support columns 451 stand up according to the number of pairs of guide rails 43. The number of installations can also be changed. The column 451 has a height dimension set to approximately half of the height dimension of the container body 21 of the heat-resistant container 20.

  Each of the semicircular arms 452 and the arc-shaped arms 453 has a radius of curvature substantially the same as the outer shape of the container main body 21 of the heat-resistant container 20, whereby the semicircular arms 452 and the pair of arc-shaped arms 453 Thus, the container body 21 can be held.

  Each arcuate arm 453 is pivotally supported at its proximal end so as to be rotatable about a vertical axis 453a. Therefore, the heat-resistant container 20 is suspended on the bottom plate 41 along the semicircular arm 452 in a state where the respective arc-shaped arms 453 are rotated in the opposite directions around the vertical axis 453a so as to be separated from each other. The heat-resistant container 20 is wrapped by the holding member 45 on the bottom plate 41 as shown in FIG. 12 by lowering and subsequently rotating the pair of arc-shaped arms 453 around the vertical axis 453a toward each other. It will be held.

  As the lock fitting 454, a well-known one such as a lock fitting used for locking the turning of the track is adopted. When the heat-resistant container 20 is held by the semicircular arm 452 and the pair of arcuate arms 453 on the bottom plate 41, the arcuate arm 453 is locked so that the arcuate arm 453 is not opened by the operation of the lock fitting 454. Even if the pallet 40 vibrates somewhat during the transportation by the 40 transportation vehicles 30, the occurrence of inconvenience such as the heat-resistant container 20 overturning is reliably prevented.

  And when loading / unloading the heat-resistant container 20 on the pallet 40, a working machine such as a crane (not shown) is used. Specifically, the work machine has a rope R suspended from a lifting arm. The rope R has a bifurcated tip, and a hook R1 is provided at the bifurcated rope R. The heat-resistant container 20 is suspended from the pallet 40 or lifted from the pallet 40 by driving the crane of the work machine in a state where these hooks R1 are locked to the respective suspension protrusions 231 of the heat-resistant container 20. It has come to be.

  In the present invention, a gas cylinder 50 in which an inert gas heavier than air, such as carbon dioxide, is compressed and filled is disposed at an appropriate position of the pallet 40 (one corner on the left side in the example shown in FIG. 11). When molten aluminum leaks from the container 20 onto the pallet 40, the inert gas is discharged from the gas cylinder 50 into a space surrounded by the waist plate 42 on the bottom plate 41.

  Specifically, the pallet 40 is provided with an inert gas pipe 52 through which an inert gas from the gas cylinder 50 is circulated through the electromagnetic valve 51 along the inner surface of the waist plate 42. A predetermined number of temperature sensors 53 are installed. The inert gas pipe 52 is provided with a plurality of gas injection holes 521 uniformly.

  The electromagnetic valve 51 is normally closed. When the temperature sensor 53 detects a temperature exceeding a preset temperature, the temperature signal is transmitted to the electromagnetic valve 51, and the electromagnetic valve 51 that receives this signal opens the valve. . Accordingly, when molten aluminum leaks from the heat-resistant container 20 loaded on the pallet 40 and thereby the temperature in the pallet 40 exceeds a preset temperature, the inert gas in the gas cylinder 50 is converted into the inert gas pipe 52. Because the gas is injected from the gas injection hole 521 toward the bottom plate 41 surrounded by the waist plate 42, even if there is a combustible material on the bottom plate 41, the occurrence of inconvenience that the combustible material burns is effectively prevented. To be inserted.

  As described above in detail, the molten metal conveyance system 10 according to the present invention is transferred from an aluminum melting factory 11 for preparing molten aluminum to an aluminum forming factory 12 for manufacturing predetermined products using molten aluminum. 20 is filled with the molten aluminum and transported, and the heat-resistant container 20 that has been emptied is returned from the aluminum molding factory 12 to the aluminum melting factory 11.

  In such a molten metal transfer system 10, the transfer vehicle 30 that is reciprocated between the aluminum melting factory 11 and the aluminum forming factory 12 is held by the transfer vehicle 30 while the transfer vehicle 30 is moved backward. And a pallet 40 that is removed from the transport vehicle 30 when the vehicle 30 moves forward. The pallet 40 is lifted up while being held by the transport vehicle 30, so that the pallet 40 can travel integrally with the transport vehicle 30. In addition, the heat-resistant container 20 is configured to be held in a stable state.

  According to the molten metal conveying system 10 having such a configuration, the molten aluminum prepared in the aluminum melting factory 11 is transferred toward the aluminum forming factory 12 by the conveying vehicle 30 in a state where the heat-resistant container 20 is filled, and the aluminum forming factory In step 12, a predetermined commercialization process is performed.

  The heat-resistant container 20 emptied at the aluminum forming factory 12 is returned to the aluminum melting factory 11 by the transport vehicle 30, and the returned heat-resistant container 20 is used for filling new molten aluminum. Therefore, the molten aluminum in the aluminum melting factory 11 is semi-continuously obtained by causing the conveyance vehicle 30 to perform piston operation (reciprocal operation) between the aluminum melting factory 11 and the aluminum molding factory 12 and catching the heat-resistant container 20 between them. The aluminum forming factory 12 is supplied, and in the aluminum forming factory 12, a predetermined product using molten aluminum as a raw material is appropriately manufactured without running out of the raw material.

  The transport vehicle 30 that is reciprocated between the aluminum melting factory 11 and the aluminum forming factory 12 has a pallet 40 configured to hold the heat-resistant container 20 in a stable state. The vehicle 30 is detachably attached to the transport vehicle 30 as the vehicle 30 advances and retreats.

  Accordingly, one pallet 40 is arranged in each of the first and aluminum forming factories 12 and one is mounted on the transport vehicle 30, thereby adopting a total of three pallets 40, thereby providing aluminum. In the melting factory 11, the heat-resistant container 20 filled with molten aluminum can be loaded on the pallet 40 disposed in a predetermined work area in a state independent of the operation of the transport vehicle 30, and the aluminum forming factory 12, the empty heat-resistant container 20 can be loaded on the pallet 40 arranged in the predetermined work area in a state independent of the operation of the transport vehicle 30.

  Accordingly, one transport vehicle 30 is operated as a piston between the first and aluminum forming factories 12, and only the pallet 40 is reloaded on the transport vehicle 30 in each factory, thereby moving from the aluminum melting plant 11 to the aluminum molding plant 12. Since it is possible to carry in molten aluminum, it is no longer necessary to employ a plurality of transport vehicles 30 to achieve efficient transfer as in the past, which contributes to a reduction in equipment costs and operating costs. can do.

  Further, in each factory, the pallet 40 disposed in advance is heat resistant without being restricted by the operation schedule of the transport vehicle 30 (that is, even when the transport vehicle 30 is not actually located in the work area). Since the containers 20 can be loaded, production activities in each factory are restricted by the operation schedule of the transport vehicle 30, so that it is possible to prevent inconveniences that greatly restrict the degree of freedom. The factory can carry out production activities properly with sufficient margins, which not only leads to improved working conditions, but can also improve the corporate image.

  Further, the transport vehicle 30 has a pallet mounting portion 320 which has a U-shape in a plan view for mounting the pallet 40 at a rear position thereof, and has a container mounting space whose rear end is open. The mounting portion 320 includes a pair of support edge portions 32c that support both side edges in the vehicle width direction of the pallet 40 formed on opposite surfaces in the vehicle width direction, and a vehicle height change that raises and lowers the pair of support edge portions 32c. Means 34 are provided.

  According to this configuration, when the pallet 40 is mounted in the container mounting space of the transport vehicle 30, a predetermined operation is performed with the pair of support edge portions 32 c lowered to the lower position by driving the vehicle height changing means 34. When the transport vehicle 30 is moved backward straight toward the pallet 40 placed in the area, the side edges in the vehicle width direction of the pallet 40 are respectively supported by the pair of support edges 32c. When the pair of support edge portions 32c are raised by driving the vehicle height changing means 34 in this state, the pallet 40 is mounted on the pallet in a state where the side edge portions are respectively supported by the support edge portions 32c and are lifted from the ground. Mounted on the part 320.

  In contrast, when unloading the pallet 40 mounted on the pallet mounting portion 320 of the transport vehicle 30, the pair of support edge portions 32c are lowered by driving the vehicle height changing means 34 and supported by the support edge portion 32c. The pallet 40 is lowered to the ground of the work area. By doing so, both side edges of the pallet 40 are removed from the support of the support edge 32c. By continuously moving the transport vehicle 30 straight, only the transport vehicle 30 moves away from the pallet 40 while the pallet 40 remains in the work area, and the unloading of the pallet 40 can be completed.

  As described above, since the lifting and lowering operation of the support edge portion 32c and the advance and retreat of the transport vehicle 30 with respect to the pallet 40 can be performed very easily, the pallet 40 can be loaded and unloaded onto the transport vehicle 30. The workability of unloading and unloading operations via the pallet 40 can be significantly improved as compared with the conventional cargo handling operation using a forklift.

  Further, the pallet 40 is formed entirely of metal, and at least a bottom plate 41 on which the heat-resistant container 20 is placed, and a vertical dimension erected from the periphery of the bottom plate 41 is the container body 21 of the heat-resistant container 20. Since the lumbar plate 42 having approximately half the height is provided, even if hot molten aluminum leaks from the heat-resistant container 20 mounted on the pallet 40 and is scattered on the pallet 40, the bottom of the pallet 40 and the hip plate 42 are Since it is made of metal, it is possible to reliably prevent the inconvenience that the pallet 40 is burned out.

  The pallet 40 is equipped with a gas cylinder 50 filled with an inert gas, and the gas cylinder 50 is configured to release the inert gas when molten aluminum leaks from the heat-resistant container 20. Therefore, when high-temperature molten aluminum leaks from the heat-resistant container 20, the inert gas is released from the gas cylinder 50 mounted on the pallet 40, whereby the pallet 40 is brought into an inert gas atmosphere, thereby even in the vicinity. Even if there is a combustible material, it is possible to reliably prevent the occurrence of inconvenience that the combustible material burns.

  The heat-resistant container 20 includes a container body 21 having an opening on the upper surface of the main body side iron skin 211 lined with the main body side heat insulating material 212, and a lid body side heat insulating material on the inner surface that closes the upper surface opening of the container main body 21. 222 is provided with a lid 22 with a lining, and a bolt B is provided as a locking means for locking the closed state of the lid 22 in a state where the lid 22 closes the upper surface opening of the container body 21. When the molten aluminum is filled in the container main body 21 of the heat-resistant container 20, the upper surface opening is closed by the lid body 22, and the closed state is locked by fastening the bolt B, so that the opening of the lid body 22 is surely prevented. The Therefore, it is possible to reliably prevent the inconvenience that the lid 22 is inadvertently opened and the molten aluminum inside leaks.

  Furthermore, the container main body 21 of the heat-resistant container 20 includes at least two guided protrusions 24 that are provided on the bottom surface of the container main body 21 so as to protrude outward, and the outer peripheral surface of the upper edge portion in the circumferential direction. Each pair of suspension protrusions 231 for hanging the container main body 21 projecting outward at an equal pitch, and the guided ridges 24 are fitted into the pallet 40. The guide rail 43 is provided with an upwardly extending inclined portion 432 for guiding the guided ridges 24 on the opposing surfaces.

  According to such a configuration, in order to mount the heat-resistant container 20 on the pallet 40, for example, the hook R 1 is hung on the lifting protrusion 231, the heat-resistant container 20 is lifted by a crane or the like, and the heat-resistant container 20 is moved from a position directly above the pallet 40. Just hang it. By doing so, the two guided ridges 24 provided at the bottom of the heat-resistant container 20 are guided to the inclined portions 432 formed on the pair of guide rails 43 on the pallet 40, and between the guide rails 43. The heat-resistant container 20 can be mounted on the pallet 40 in a stable positioning state.

  The present invention is not limited to the above embodiment, and includes the following contents.

  (1) In the above embodiment, molten aluminum is adopted as the molten metal, but the present invention is not limited to the molten metal being molten aluminum, but other than aluminum such as molten lead. It is also possible to target a molten metal.

  (2) In the above embodiment, the trailer 32 itself is lifted and lowered to lift the pallet 40 in a state where the pallet 40 is mounted on the trailer 32 of the transport vehicle 30. You may make it raise / lower only the supporting edge 32c currently supported.

  (3) In the above embodiment, the pallet 40 is provided with the three refractory containers 20. However, in the present invention, the refractory container 20 mounted on the pallet 40 is provided with three tubs. It is not limited and may be 2 tanks or less, and may exceed 3 tanks.

  (4) In the above embodiment, the gas cylinder 50 is filled with oxygen dioxide as an inert gas for extinguishing fire, but nitrogen may be employed instead of oxygen dioxide. In particular, if liquid nitrogen is employed, when molten aluminum leaks from the heat-resistant container 20 onto the pallet 40, the high-temperature molten aluminum can be cooled with the liquid nitrogen, and a more reliable fire-extinguishing effect can be obtained.

  (5) In the above embodiment, the heat-resistant container 20 is loaded on the pallet 40. Instead of this, the pallet 40 is modified and melted in the pallet 40 itself without the heat-resistant container 20 being interposed. You may make it fill with a metal. By doing so, it is not necessary to carry out the cargo handling work on the pallet 40 of the heat-resistant container 20, and the operation of the molten metal transfer system becomes more efficient.

It is explanatory drawing of the side view for demonstrating the outline | summary of a molten metal conveyance system. It is explanatory drawing of the planar view for demonstrating each process of molten aluminum conveyance in a molten metal conveyance system, (A) is the state when the conveyance vehicle immediately after an operation start is heading to an aluminum melting factory, (B) These show the state which is loading the pallet with which the heat-resistant container containing molten aluminum is mounted in the trailer of a conveyance vehicle, respectively. It is explanatory drawing of the planar view for demonstrating each process of molten aluminum conveyance in a molten metal conveyance system, (A) is a pallet with which the heat resistant container containing molten aluminum was loaded in the melting factory side transshipment work area. A state where the transport vehicle is mounted on the trailer of the vehicle, (B) shows a state where the transport vehicle is traveling toward the aluminum forming factory with a heat-resistant container containing molten aluminum. It is explanatory drawing of the planar view for demonstrating each process of molten aluminum conveyance in the molten metal conveyance system 10, (A) is taking down the pallet 40 from the trailer of the conveyance vehicle which arrived at the molding factory side transshipment work area. In a certain state, (B) shows a state where a pallet on which an empty heat-resistant container prepared in advance in the molding factory side transshipment work area is loaded is being loaded onto the trailer of the transport vehicle. It is a partially cutaway perspective view showing one embodiment of a heat-resistant container. It is VI-VI sectional view taken on the line of the heat-resistant container shown in FIG. It is explanatory drawing of the side view which shows one Embodiment of the conveyance vehicle used by this invention, (A) has shown the state in which the trailer rose, (B) has each shown the state in which the trailer fell. 8A and 8B are rear views of the transport vehicle illustrated in FIG. 7, in which FIG. 7A illustrates a state where the trailer is raised, and FIG. 7B illustrates a state where the trailer is lowered. It is a perspective view which shows one Embodiment of a trailer. It is explanatory drawing which shows one Embodiment of a vehicle height change means, (A) is the state in which the trailer was set to the raise position by the vehicle height change means, (B) is the trailer set to the same fall position. Each state is shown. It is a partially cutaway perspective view showing one embodiment of a pallet, and shows a state where a heat-resistant container is not loaded on the pallet. It is a partially cutaway perspective view showing an embodiment of a pallet, and shows a state where a heat-resistant container is loaded on the pallet.

Explanation of symbols

10 Molten metal transport system 11 Aluminum melting factory (first factory)
111 melting factory side transshipment work area 12 aluminum forming factory (second factory)
121 Molding factory side transshipment work area 13 Public road 20 Heat resistant container 21 Container body 211 Body side iron skin 212 Body side heat insulating material 213 Body side flange 22 Cover body 221 Cover body side iron skin 222 Cover body side heat insulating material 223 Cover body side flange 23 Body 231 Suspension protrusion 24 Guided ridge 241 Inclined edge 25 Aluminum intake / exhaust pipe 26 Gas intake / exhaust pipe 30 Transport vehicle 31 Tractor 311 Chassis 312 Operation room 313 Connection base 313a Lower connection base 313b Upper connection base 313c Vertical shaft 32 Trailer 320 Pallet mounting part (container mounting space)
320a Clearance 321 Connecting rod 32a Side wall 32b Front wall 32c Support edge (support rail)
33 Driven wheel 33a Axle 34 Vehicle height changing means (rail elevating mechanism)
340 Wheel storage space 341 Cam 341a Cam support shaft 341b Bearing 342 Cylinder device 343 Hydraulic cylinder 344 Piston rod 35 Front vehicle height changing means 351 Intermediate member 352 Hydraulic cylinder 353 Piston rod 40 Pallet 41 Bottom plate 42 Waist plate 421 Long waist plate 422 Short waist plate 43 Guide rail (guide protrusion)
431 Vertical part 432 Inclined part (guide inclined surface)
44 Leg ridge 441 Supported edge 45 Holding member 451 Strut 452 Semi-circular arm 453 Arc-shaped arm 453a Vertical shaft 454 Lock fitting 50 Gas cylinder 51 Electromagnetic valve 52 Inert gas piping 521 Gas injection hole 53 Temperature sensor B Bolt ( Locking means)
N Nut (Locking means) P Vacuum pump P1 Pump piping P2 Gas source R Rope R1 Hook

Claims (5)

From the first factory that prepares the molten metal to the second factory that uses the molten metal to manufacture a predetermined product, the molten metal is filled and transferred into the heat-resistant container, and the empty heat-resistant container is removed from the first factory. In a molten metal transport system that returns from the second factory to the first factory,
A transport vehicle reciprocated between the first and second factories;
A pallet that is held by the transport vehicle by the retreat of the transport vehicle and removed from the transport vehicle by the advance of the transport vehicle,
The pallet is in a mounted state capable of traveling integrally with the transport vehicle by being lifted up while being held by the transport vehicle ,
The heat-resistant container includes: a container body having an opening on an upper surface of which an inner surface of an iron skin is lined with a heat insulating material; and a lid body having a heat insulating material lined on an inner surface for closing the upper surface opening of the container body. Locking means for locking the closed state of the lid in a state where the body closes the upper surface opening of the container body is provided,
The container body protrudes outward at an equal pitch in the circumferential direction from the outer peripheral surface of the upper edge portion and at least two guided protrusions that are parallel to each other and protrude outwardly on the bottom surface. And at least two suspension protrusions for suspending the container body, and the pallet is provided with a guide protrusion into which the guided protrusion is fitted, and the guided protrusion has a lower edge. Part having an inclined edge surface that inclines downward toward the opposite direction and extends over the entire length in the longitudinal direction,
The guide protrusion is formed with an upwardly extending guide inclined surface that guides and places the inclined edge surface of the guided protrusion on the opposing surfaces, and the inclination angle of the inclined edge surface with respect to the horizontal plane is A molten metal transport system, characterized in that it is set to have the same inclination angle of the guide inclined surface . The pallet includes a holding member for holding a heat-resistant container loaded on the pallet,
The holding member includes a support column erected at an intermediate position between the guide protrusions on the bottom plate of the pallet, a semicircular arm protruding from the support column, and a pivot from each tip of the semicircular arm. A pair of arc-shaped arms extending in a possible manner, and a lock fitting provided on the tip side of each arc-shaped arm,
2. The melting according to claim 1, wherein the lock fitting locks the arc-shaped arm so as not to open in a state where the heat-resistant container is held by the semicircular arm and the pair of arc-shaped arms. Metal transport system. The transport vehicle has a U-shape in a plan view for mounting the pallet at a rear position thereof, and has a pallet mounting portion including a container mounting space whose rear end is in an open state,
The pallet mounting portion is provided with a pair of support rails that are formed on opposite surfaces in the vehicle width direction and that support both side edges of the pallet in the vehicle width direction, and a rail lifting mechanism that lifts and lowers the pair of support rails. transport system of the molten metal according to claim 1 or 2, wherein the being. The pallet includes at least a metal bottom plate on which the heat-resistant container is placed, and a metal waist plate standing upright from a peripheral edge of the bottom plate and having a predetermined length. Item 4. A molten metal conveyance system according to any one of Items 1 to 3. The pallet is equipped with a gas cylinder filled with an inert gas, and the gas cylinder is configured to release the inert gas when molten metal leaks from the heat-resistant container. The molten metal conveyance system according to any one of claims 1 to 4,

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