Ingot preheating device

Abstract

The invention provides an ingot preheating device, which is easy to adjust the heating capability, can efficiently preheat an ingot, and can restrain the energy loss to a minimum limit and maintain a certain temperature after heating. An ingot preheating device is provided with a preheating chamber (10), which is a space in which an ingot is heated and preheated, and a transport unit that transports the ingot, the transport unit having a plurality of rails (20) on which the ingot (2a, 2b, 2c) is placed and transported, the preheating chamber (10) having: an inlet shutter (11) that shields the inlet of the preheating chamber (10); the outlet blocking door (12) shields an outlet of the preheating chamber (10); and a heater (13) for blowing hot air in the preheating chamber (10) to the ingot (2a) placed on the rail (20) and conveyed to the front of the outlet shutter (12).

Description

Technical Field

[0001] The present invention relates to an ingot preheating device for preheating an ingot used in a casting device. Background Art

[0002] In the casting process of the previous casting device, the mainstream process is to melt the ingot and transport it to each holding furnace for casting. However, in this previous process, there are problems such as the huge amount of energy required for melting the ingot, safety when transporting the molten molten metal, and cost issues. Therefore, the following process is studied: the holding furnace is equipped with the ability to melt the ingot, and the molten metal corresponding to the operation can be generated, and the energy efficiency is improved by re-examining the ingot supply, melting in the holding furnace, and casting process.

[0003] In this process, the ingot needs to be preheated when the ingot is supplied. This is to maintain the melting assistance of the furnace and prevent the formation of pores caused by a trace amount of water remaining in the ingot. Various schemes have been proposed for preheating the ingot. For example, Patent Document 1 discloses an ingot preheating device that can heat the ingot under the optimal heating conditions.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2016-43367 Summary of the invention

[0007] Problems to be solved by the invention

[0008] However, even through the process of achieving the above-mentioned improvement in energy efficiency, in the preheating of ingots, especially the preheating of aluminum ingots, although radiation, direct heating, convection electric heating, etc. have been studied, there are still problems of low heating efficiency and high energy waste due to the characteristics of aluminum such as low absorptivity.

[0009] In addition, the supply of ingots may need to be temporarily stopped depending on the location where ingots need to be supplied according to the production process, failures in the subsequent process, the timing of the operator's rest, etc. At this time, in order to suppress energy loss and prevent poor transportation due to deformation of aluminum, the temperature must be kept constant, but there is a problem that the temperature control is also difficult.

[0010] Therefore, the present invention is completed in view of the above-mentioned problems, and its purpose is to provide an ingot preheating device whose heating capacity is easy to adjust and can preheat the ingot efficiently. In addition, after heating, energy loss can be suppressed to a minimum and a certain temperature can be maintained.

[0011] Technical solutions to solve problems

[0012] In order to solve the above-mentioned problems, the ingot preheating device of the present invention heats the ingot for casting and preheats it before holding it in a furnace for melting, and is characterized in that it comprises: a preheating chamber, which is a space for accommodating a plurality of ingots inside and heating the ingots for preheating; and a conveying section, which conveys the ingots inside and outside the preheating chamber, the conveying section having a plurality of tracks for carrying and conveying the ingots, and the preheating chamber comprising: an entrance damper, which shields the entrance of the preheating chamber; an exit damper, which shields the exit of the preheating chamber; and a heater, which blows hot air to the ingots placed on the tracks and conveyed to the front of the exit damper in the preheating chamber.

[0013] Here, it is preferred that the heater blows hot air in a vertical direction from a ceiling in the preheating chamber to directly heat the ingot.

[0014] In addition, it is preferred that the entrance damper and the exit damper are opened and closed synchronously.

[0015] Furthermore, it is preferable that the transport unit includes a guide for restricting left-right movement of the ingot on the rail.

[0016] Effects of the Invention

[0017] As described above, according to the ingot preheating device of the present invention, the hot air from the heater is used to directly heat the ingot in the heating chamber, so the heating capacity can be easily adjusted and the ingot can be preheated efficiently. In addition, since the heating chamber is shielded by the entrance damper and the exit damper, the energy loss can be suppressed to a minimum and a certain temperature can be maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a diagram schematically showing the structure of the ingot preheating device according to the present embodiment.

[0019] Figure 2 It is a figure which shows roughly the structure inside the preheating chamber. DETAILED DESCRIPTION

[0020] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0021] Figure 1 This is a diagram schematically showing the structure of an ingot preheating device. Figure 2 It is a figure which shows roughly the structure inside the preheating chamber.

[0022] The ingot preheating device 1 according to the present embodiment is an ingot preheating device that preliminarily heats an ingot for casting before melting it in a holding furnace.

[0023] The ingot preheating device 1 generally includes a preheating section that heats the ingot for preheating the ingot and a conveying section that conveys the ingot.

[0024] The preheating section includes: a preheating chamber 10, which is a space for preheating the ingot; an entrance damper 11, which shields the entrance side of the preheating chamber 10; an exit damper 12, which shields the exit side; a heater 13, which heats the ingot in the preheating chamber 10; and an exhaust chimney 14, which exhausts hot air from the preheating chamber 10.

[0025] The conveying unit includes: a plurality of rails 20 for placing and conveying the ingot inside and outside the preheating chamber 10; a pusher 21 for pushing the ingot on the rail 20 into the preheating chamber 10; and a guide 22 for limiting the left and right movement of the ingot on the rail 20. The rail 20 extends in the direction of the ingot's travel, places the ingot on it, and conveys the ingot inside and outside the preheating chamber 10 by sliding the ingot. That is, the rail 20 is responsible for conveying the ingot into the preheating chamber 10 before preheating, conveying the ingot inside the preheating chamber 10, and conveying the ingot out of the preheating chamber 10 after preheating. In order to enable smooth conveying, the rail 20 preferably uses a rail with a low friction coefficient such as a round bar or a flat rod, and more preferably uses a rail that has been subjected to wear resistance treatment.

[0026] The preheating chamber 10 has a space capable of accommodating a plurality of ingots therein. An entrance damper 11 as a door shielding the entrance side of the preheating chamber 10 and an exit damper 12 as a door shielding the exit side of the preheating chamber 10 are opened and closed synchronously.

[0027] When the ingot is conveyed to the preheating chamber 10, the entrance damper 11 and the exit damper 12 are closed, and the preheating chamber 10 becomes a closed space. That is, the preheating chamber 10 becomes a space shielded by the entrance damper 11 and the exit damper 12, in which the ingot is preheated. In the preheating chamber 10, the ingot 2a conveyed to the front of the exit damper 12 as the discharge side becomes the object of heating based on the heater 13. The innermost ingot 2a located in the preheating chamber 10 is directly heated, and the ingot 2b located on the front side (entrance damper 11 side) in the preheating chamber 10 receives the residual heat of the direct heating, preparing for the subsequent direct heating. In addition, here, an example of conveying two ingots in the preheating chamber 10 is shown, but three or more ingots can also be conveyed, as long as a plurality of ingots are conveyed to the preheating chamber 10 in the preheating process.

[0028] The heater 13 is composed of a hot air generator and is arranged on the ceiling of the preheating chamber 10 so as to blow hot air downward. The heater 13 blows hot air in a direction perpendicular to the ingot 2a to directly heat the ingot 2a and preheat the ingot 2a. The hot air that collides with the ingot 2a also preheats the ingot 2b located behind and to be heated next, and then is discharged from the exhaust chimney 14 as a channel for exhausting the hot air. The hot air from the heater 13 is as follows: Figure 1As shown by the dotted arrow, the ingot 2a not only collides with the ingot 2a and flows backward, but also flows backward after passing under the track 20 for conveying the ingot. The hot air in the preheating chamber 10 can also be sucked in the discharge chimney 14 to promote the hot air to flow backward and be discharged.

[0029] By placing the ingot on the track 20 and sliding it on the track 20 for transportation, the contact area between the track 20 and the ingot can be minimized, and a state in which the bottom surface of the ingot 2a is open between the tracks 20 can be created. By setting such a structure, when the hot air also goes around the bottom of the track 20, the flow of hot air in the gap between the tracks will not be hindered, and the hot air that goes around collides with and heats the bottom surface of the ingot 2a, thereby achieving a further improvement in heating efficiency. Here, two tracks 20 are shown, but the conveying section can also be composed of three or more tracks 20. However, from the viewpoint of setting the bottom surface of the ingot 2a to be open between the tracks 20 without hindering the flow of hot air, it can be said that it is preferably composed of two tracks.

[0030] The temperature of the hot air blown out from the heater 13 is preferably managed by a thermocouple provided at the front end of the heater 13 to adjust the heating capacity. If it is adjusted according to the heating capacity required for the ingot to be heated, overheating can be avoided and efficient heating can be performed. In addition, the preheating of the ingot is preferably managed according to the heating time. If the heating time is specified, the temperature of the hot air is lowered and adjusted to maintain a certain temperature. In this way, energy waste can be reduced according to the production process and energy loss can be suppressed to a minimum. In previous ingot preheating devices, heating based on gas burners was the mainstream, but by using a hot air generator for heating, energy can be used efficiently.

[0031] After the preheating, the ingot 2a is sent out from the ingot preheating device 1 with the outlet damper 12 opened. At this time, the inlet damper 11 is opened, and when the ingot 2c is sent into the heating chamber 10, the ingot 2b is pressed into the inner side of the heating chamber 10, and the ingot 2a after the preheating is pushed out from the ingot preheating device 1, and the ingot 2b is preheated by direct heating of the hot air blown out of the heater 13. In this way, when the ingot is transported out of the preheating chamber 10 and transported into the preheating chamber 10, the outlet damper 12 is opened and closed synchronously with the inlet damper 11. In this way, the preheating chamber 10 is maintained as a closed space, so that the temperature in the preheating chamber 10 can be maintained constant. In particular, when a fault occurs in the subsequent process and the device is stopped, it is also possible to suppress the temperature in the preheating chamber 10 from dropping sharply, so that energy loss can be reduced.

[0032] In addition, by adopting a structure in which the ingot is placed on a rail for transportation and is pushed into the preheating chamber, it is possible to reduce the causes of troubles without arranging equipment in the heating furnace.

[0033] The ingot preheating device involved in the present invention is described above based on the implementation mode, but the present invention is not limited to this. The purpose of the present invention can be achieved, and various design changes can be made within the scope of the main purpose of the invention, which are all included in the scope of the present invention.

[0034] For example, in the above-mentioned embodiment, a structure is adopted in which a heater that blows out hot air is arranged on the ceiling of the heating chamber so that the hot air collides with the ingot in a vertical direction. However, in a case where the upper surface of the ingot is not a flat surface, in order to blow hot air to flat surfaces such as the side surfaces and the bottom surfaces, a heater may be arranged on the side surfaces and the bottom of the heating chamber in such a manner that hot air is blown from the side directions and the bottom directions. Industrial Applicability

[0035] The ingot preheating device according to the present invention is suitable as an ingot preheating device for preheating an ingot used in a casting device. Description of symbols

[0036] 1 Ingot preheating device;

[0037] 2a, 2b, 2c ingots;

[0038] 10. Preheating chamber;

[0039] 11 Entrance door;

[0040] 12 Exit door;

[0041] 13. Heater;

[0042] 14 discharge chimney;

[0043] 20 tracks;

[0044] 21 propulsion element;

[0045] 22 Guide.

Claims

1. An ingot preheating device for heating an ingot for casting and preheating it before melting in a holding furnace, characterized in that: The ingot preheating device comprises: a preheating chamber, which is a space for accommodating a plurality of ingots and heating the ingots for preheating; and a conveying unit, which conveys the ingots in and out of the preheating chamber. The transport unit has a plurality of rails for placing and transporting ingots. The preheating chamber comprises: an entrance damper shielding the entrance of the preheating chamber; an exit damper shielding the exit of the preheating chamber; and a heater blowing hot air to the ingot placed on the rail and transported to the front of the exit damper in the preheating chamber.

2. The ingot preheating device according to claim 1, characterized in that: The heater blows hot air in a vertical direction from the ceiling in the preheating chamber to directly heat the ingot.

3. The ingot preheating device according to claim 1 or 2, characterized in that: The entrance damper and the exit damper are opened and closed synchronously.

4. The ingot preheating device according to claim 1 or 2, characterized in that: The transport unit includes a guide that restricts left-right movement of the ingot on the rail.

Images