JP5873137B2 - Material supply system for electric furnace - Google Patents

Description

  The present invention relates to a material supply system for an electric furnace.

  A conventional material supply system for an electric furnace transports material from a material storage unit such as a scrap yard and puts it into the electric furnace, starts electric heating of the material in the electric furnace, raises the temperature, and melts ( For example, see Patent Document 1).

Japanese Patent Laid-Open No. 9-58869

However, heretofore, there has been a problem that a large amount of electric energy is required when melting a material in an electric furnace, and the cost for the material melting operation is high.
In particular, the process of heating the material from room temperature to the melting point in an electric furnace accounts for 60% to 70% of the electric power energy required from the start of melting to the completion of melting, which is a major cause of cost increase.

  Accordingly, an object of the present invention is to provide a material supply system for an electric furnace that can reduce the power consumed when the material is heated in the electric furnace and can reduce the cost of the entire material melting operation.

In order to achieve the above object, a material supply system for an electric furnace according to the present invention is a carriage that can reciprocate along a track between an electric furnace and a material storage unit in which material to be supplied to the electric furnace is stored. A material storage drum having an opening in the cart, tilting means for changing the drum to correspond to a material receiving posture, a preheating posture, and a material discharging posture, and the material in the drum A rotating means for rotating the drum to agitate the drum, and a cover with a burner that can be applied as a cover to the opening of the drum is provided in the middle of the track, and A receiving hopper into which material from the material storing unit is charged is provided between the material storing unit and the lid so as to be able to run in a horizontal direction perpendicular to the track, and the receiving hopper is rearward of the lower end opening. Inclined receiving box Has the door, to the drum of the material receiving position forward on傾状, after accommodating the material through the acceptance chute of said receiving hopper, said receiving hopper in plan view is moved in the horizontal direction Escape from the traveling locus of the carriage, run the carriage forward, put the lid on the opening of the drum held in an inclined preheating posture by the tilting means, and preheat The drum in a posture is driven to rotate by the rotating means and the burner of the lid body in the covered state is burned to raise the temperature of the material to a predetermined preheating temperature, and then the lid body is put into a non-covered state. In this system, the cart arrives in the vicinity of the electric furnace, the drum is changed to a forward and downward inclined material discharge posture by the tilting means, and the preheated material is supplied to the electric furnace.

Further, the lid is a fixed frame which is arranged in the middle of the track, Ru system der which is provided to be freely switchable swing and inclined posture and horizontally posture.

  According to the present invention, after preheating the material with a burner using inexpensive kerosene or the like, it can be supplied to the electric furnace, greatly reducing the amount of electricity consumed when melting the material in the electric furnace, and the entire melting operation Such costs can be reduced. By rotation, the material is uniformly heated as a whole, and melting after charging into the electric furnace can be smoothly performed with high quality. Acceptance of material from the material storage unit, preheating of the accepted material, and supply of material from the drum to the electric furnace can be reliably and smoothly performed with a single carriage.

It is a side view which shows one Embodiment of this invention. It is a side view which shows an example of a material acceptance attitude | position. It is a side view which shows an example of a material discharge | emission attitude | position. It is a principal part side view which shows an example of a rotation means. It is principal part sectional drawing which shows the drum and cover body of a preheating state. It is a perspective view which shows the relief process of a receiving hopper. It is a side view which shows a preheating process. It is a side view which shows a material supply process. It is a top view.

Hereinafter, the present invention will be described in detail based on illustrated embodiments.
As shown in FIG. 1, an electric furnace 99 such as an induction furnace, a material storage unit 90 in which a material W to be supplied to the electric furnace 99 is stored, and a forward and backward direction between the electric furnace 99 and the material storage unit 90 And a self-propelled carriage 1 having a plurality of wheels 19 and 19 that roll in the front-rear direction on the track 22. .

A cart 1 has a bottomed cylindrical drum 2 for material storage, a tilting means 3 for changing the posture of the drum 2, a rotating means 5 for rotating the drum 2, and a supply chute 8 tilted forward and downward. And a vibration means for applying vibration to the supply chute 8 and a driving source for traveling are mounted.
As shown in FIGS. 2 to 4, the drum 2 has a circular bottom wall 2 </ b> A and a cylindrical peripheral wall 2 </ b> B, and a circular opening 20 is formed.

  The tilting means 3 has one end 30 a pivotally attached to the support column 11 of the carriage 1 so as to be swingable around a horizontal horizontal axis and the other end 30 b attached to a drum holding frame 4 holding the drum 2. One end 31a is pivotally mounted around the left and right horizontal axis and the other end 31b is pivotally mounted to the drum holding frame 4 about the left and right horizontal axis. And an actuator 31 such as a telescopic hydraulic cylinder or an electric cylinder.

  The tilting means 3 expands and contracts the actuator 31 so that the posture of the drum 2 is tilted in the same or slightly different manner from the material receiving posture (see FIGS. 1 and 2) having the upwardly inclined shape (see FIGS. 1 and 2). The preheating posture (refer to FIG. 7) and the material discharge posture (refer to FIG. 3 and FIG. 8) inclined downward are changed.

  The rotating means 5 rotates the drum 2 around the drum axis L2, and meshes with a drive source M such as an electric motor, a speed reducer 51, a drive gear portion 52, and a drive gear portion 52. And an annular gear portion (rack portion) 53 fixed to the drum 2 in an outer fitting manner. (Note that the rotating means 5 is not shown in FIGS. 6 and 9.)

  The drum holding frame 4 includes a first ring portion 41 provided on the opening 20 side of the drum 2 and fixed in an outer fitting manner, and a second ring portion provided on the bottom side of the drum 2 and fixed in an outer fitting manner. And a pair of left and right first support rollers 43 that roll to the first ring portion 41, and a pair of left and right second support rollers 44 that roll to the second ring portion 42, and the drum axis L2 The outer peripheral side of the drum 2 is held so as to be rotatable around.

  The supply chute 8 is provided at the front position of the drum 2 and is vibrated by vibration means (not shown) so that the material W in the supply chute 8 is slidable (easy to flow) forward and downward.

Further, as shown in FIG. 1, a gate-shaped fixed frame 60 is provided in the middle of the track 22 (front and rear intermediate positions) so as to straddle the track 22 and through which the carriage 1 on which the drum 2 and the like are mounted can pass. ing.
The fixed frame 60 is provided with a lid 6 with a circular plate-like burner 61 that can be applied to the opening 20 of the drum 2 as a covered state. The lid body 6 is disposed on the track 22 (on the front and rear traveling locus of the carriage 1, the drum 2, etc.) in plan view.

The lid 6 is provided on the fixed frame 60 so as to be able to switch between a horizontal posture (see FIG. 1) and an inclined posture (see FIG. 7).
As shown in FIG. 5, the lid body 6 is in an inclined posture, and is in a covered state corresponding to the opening 20 of the drum 2 in a preheated posture inclined upward and corresponding to sliding contact.

The lid 6 includes a burner 61 combustible with liquid fuel or gaseous fuel, and a chimney 62 having an exhaust passage 62a.
The burner 61 is burned by liquid fuel or gas whose energy cost for raising the temperature per unit weight of the material W is lower than that of the electric furnace 99 (electric charge thereof), and in particular, kerosene (liquid fuel ) (Kerosene burner 61) is preferable because fuel can be secured inexpensively and stably and safety is high.

The drum 2 also has blades 28 for material agitation and discharge promotion.
The blades 28 project radially inward from the inner peripheral surface of the drum 2 and are provided with a plurality of equal intervals around the drum axis L2 to form a belt plate shape along the direction of the drum axis L2, or A plurality of mold blades 28 may be provided at equal intervals around the drum axis L2 by tilting at a predetermined angle from the radial line of the drum 2.
Although not shown, it is desirable that the blades 28 have a spiral shape around the drum axis L2, and the material W is spirally moved to further promote the stirring action of the material W, thereby raising the temperature of the material W to a uniform temperature. .

Further, as shown in FIG. 1, a drum throwing means 95 having a receiving hopper 92 into which the material W is thrown by the hopper throwing means 97 is provided between the material storage unit 90 and the lid body 6 (front and rear intermediate positions). ing.
The receiving hopper 92 has a receiving chute 93 inclined downward and rearward for guiding the material W to the opening 20 of the drum 2 in the material receiving posture at the lower end opening.
Moreover, the drum throwing means 95 has left and right guide suspension rails 96, 96, and holds the receiving hopper 92 in a suspended manner so that it can move (run) left and right. The receiving hopper 92 includes a plurality of wheels that roll on the suspension rails 96.

  When the drum 2 is in the material receiving posture, the drum 2 and the receiving chute 93 are in contact with or close to each other, and the lower opening end of the receiving chute 93 faces rearward. The carriage 1 cannot move forward. Accordingly, as shown in FIG. 6 from the state of FIG. 1, the receiving hopper 92 is caused to self-travel in the left-right direction along the suspension rails 96, 96 (the receiving chute 93 is left and right from the traveling locus of the carriage 1 in plan view). In this configuration, the carriage 1 mounted with the drum 2 and the like can be moved forward.

  The hopper loading means 97 includes a crane track made up of a pair of left and right crane rails 98, 98 disposed on the ceiling side along the front-rear direction, and a lifting magnet 91 that can travel along the crane track.

  The carriage 1, the tilting means 3, the rotating means 5 (not shown in FIG. 6), the drum throwing means 95, the hopper throwing means 97, the lid body 6, the electric furnace 99, and the furnace lid of the electric furnace 99 (FIG. 6). Are connected to a control unit such as a computer so that control signals can be transmitted and received by wire or wirelessly, and can be manually operated remotely from a control room (not shown) or automatically (remotely) operated by a program. It is configured to be possible.

Next, the usage method (operation | movement) of the material supply system for electric furnaces of this invention is demonstrated.
As shown in FIG. 1, the receiving hopper 92 is disposed above the carriage 1 at a position in front of the material storage unit 90 (arranged on the track 22 in plan view). The drum 2 mounted on the carriage 1 is held by the tilting means 3 in a material receiving posture that is inclined forward and upward. The lower opening end (discharge port) of the receiving chute 93 and the opening 20 of the drum 2 are in close contact with each other and communicate with each other.

  In the state of FIG. 1, when a predetermined weight of material W is put into the drum 2 via the receiving chute 93 of the receiving hopper 92 (material receiving step), the receiving hopper 92 is suspended by the suspension rails 96 and 96 as shown in FIG. 6. Then, the carriage 1 mounted with the drum 2 and the like can move forward along the track 22 (accepting hopper escape process). In addition, before letting the receiving hopper 92 escape in the left-right direction, the drum 2 may be slightly tilted by the tilting means 3 so that the opening 20 of the drum 2 and the discharge port of the receiving chute 93 are separated by a predetermined dimension. .

And the trolley | bogie 1 which accommodated the material W in the drum 2 is made to drive ahead. The drum 2 in the preheating posture held in the tilting state (tilting angle) that is the same as or slightly different from the material receiving posture by the tilting means 3 is made to correspond to the lower position of the lid body 6.
The lid body 6 swings downward from the horizontal posture in FIG. 6 to become an inclined posture as shown in FIG.
By setting the preheating posture and the material receiving posture to the same or slightly different inclination angles (within 10 degrees), it is not necessary to largely operate the tilting means 3 from the material receiving process to the end of the preheating process. It is possible to reduce the time for operating 3 and the energy consumed.

  Then, as shown in FIG. 5, while the drum 2 in the preheating posture is rotationally driven by the rotating means 5, the burner 61 of the lid body 6 in the lid application state (approaching or sliding contact with the drum 2) is burned, A preheating step for raising the temperature of the material W to a predetermined temperature is performed. Smoke generated in the drum 2 is discharged to the outside of the drum 2 through the exhaust passage 62a.

Thus, by rotating the drum 2 in an upwardly inclined manner, the internal material W is heated evenly, and the temperature can be increased efficiently (from room temperature).
For example, the average temperature of the material W in the drum 2 is raised to a temperature of 40% to 80% of the melting point, more preferably 45% to 75% (predetermined preheating temperature). More preferably, for example, a material having a melting point of about 1150 ° C. is heated from about 20 ° C. to about 600 ° C. (a temperature having a value of 50% to 60% of the melting point).

  Further, since the drum 2 has the blade 28 for stirring the material, the blade 28 stirs the material W by the rotation of the drum 2, and the material W in the drum 2 rises more uniformly and quickly from the normal temperature. Let warm.

  After heating the material W in the drum 2 to a predetermined preheating temperature, the lid body 6 is swung upward to be in a horizontal posture and separated from the drum 2 (the lid body 6 is in a non-covered state with respect to the drum 2). To do). Thereafter, the carriage 1 on which the drum 2 and the like are mounted is caused to run horizontally forward to the vicinity of the electric furnace 99. At this time, the temperature of the material W may be kept uniform by running while rotating the drum 2 by the rotating means 5.

  The drum 2 containing the preheated material W arrives in the vicinity of the electric furnace 99 as shown in FIG. 8 and is then switched to the forward and downward inclined material discharge posture by the tilting means 3, via the supply chute 8. Then, the preheated material W is supplied to the electric furnace 99 (material supply process). At the time of this supply, the drum 2 is rotated by the rotating means 5 to promote the discharge of the material W from the drum 2. With the blades 28, the operation of discharging the material W from the drum 2 can be performed more quickly and easily. Further, the supply chute 8 is vibrated by vibration means (not shown) so that the material W can easily flow forward and downward.

  A cart 1 (material storage device 9) on which a drum 2 or the like is mounted supplies the material W directly to the electric furnace 99. After the material W is supplied to the electric furnace 99, the cart 1 is returned to the material receiving position (in the vicinity of the material storage unit 90) while switching to the material receiving posture by the tilting means 3, and the material receiving process, preheating process and material supplying process (drum Repeat the discharge process.

  Further, as shown in FIG. 9, the material supply system for an electric furnace according to the present invention includes a plurality of electric furnaces 99, a plurality of carriages 1 on which drums 2 and the like are mounted, and a track 22 corresponding to each electric furnace 99. The track 22 and the carriage 1 correspond to each electric furnace 99 on a one-to-one basis.

  The drum insertion means 95 is shared by the tracks 22 (cart 1) adjacent in the left-right direction. As shown in the figure, a pair of suspension rails 96, 96 of the drum insertion means 95 are provided so as to cross the four tracks 22 in the left-right direction in plan view, and the receiving hopper travels along the suspension rails 96, 96. 92 units are provided (less than the number of tracks 22 and the number of carts 1).

Further, the hopper loading means 97 is shared by the tracks 22 (cart 1) adjacent in the left-right direction. A crane track comprising a pair of left and right crane rails 98, 98 of the hopper loading means 97 is provided so as to be movable (runnable) in the left-right direction.
Two crane tracks and lifting magnets 91 are provided (less than the number of tracks 22 and the number of carriages 1 of the carriage 1).
Compared with the case where the drum input means 95 and the hopper input means 97 are provided individually for each carriage 1 (dedicated), the power consumption can be reduced and the equipment introduction cost can be reduced.

  The design of the present invention can be changed, and the material storage unit 90 is not limited to a vertical hole type material yard, and may be a ground partition type material yard, a silo type, or a box type. The rotating means 5 that rotates the drum 2 by rotating one or more of the plurality of support rollers 43 and 44 may be used. Further, when the tilting means 3 changes the drum 2 so as to correspond to the material receiving posture, the preheating posture, and the material discharging posture, the two postures may be the same. The hopper charging means 97 may be configured by a belt conveyor or the like as long as the material W can be charged into the receiving hopper 92 from the material storage unit 90.

  As described above, the electric furnace material supply system of the present invention can reciprocate along the track 22 between the electric furnace 99 and the material storage unit 90 in which the material W to be supplied to the electric furnace 99 is stored. A carriage 1 is provided, and the carriage 1 is provided with a material accommodating drum 2 having an opening 20, tilting means 3 for changing the drum 2 to correspond to a material receiving posture, a preheating posture, and a material discharging posture, and a drum, Rotating means 5 for rotating the drum 2 to agitate the material W in 2, and a burner 61 that can be applied as a cover to the opening 20 of the drum 2 in the middle of the track 22. After the cover 6 is provided and the material W is accommodated in the drum 2, the carriage 1 is moved forward, and the lid 20 is opened with respect to the opening 20 of the drum 2 held in the inclined preheating posture by the tilting means 3. 6 is in a cover state, and the drum 2 in the preheating posture is rotated by the rotating means 5. Then, the burner 61 of the lid body 6 in the covered state is burned to raise the temperature of the material W to a predetermined preheating temperature, then the lid body 6 is brought into the non-covered state, and the carriage 1 arrives near the electric furnace 99, The tilting means 3 changes the drum 2 to a forward and downward inclined material discharge posture and supplies the preheated material W to the electric furnace 99. Therefore, the material W preheated by the burner 61 can be supplied to the electric furnace 99. The amount of electricity consumed when melting the material W in the electric furnace 99 can be greatly reduced, and the cost for the entire melting operation can be reduced. The electric furnace 99 is difficult to cool and can efficiently heat the material W. One carriage for receiving the material W from the material storage unit 90 (receiving process), preheating the received material W (preheating process), and supplying the material from the drum 2 to the electric furnace 99 (material supplying process) It can be performed reliably and smoothly only by reciprocating 1 in the front-rear direction. The material W in the drum 2 can be heated uniformly and efficiently. The entire material W can be quickly heated to a predetermined preheating temperature. System facilities can be simplified and the introduction cost of the entire system can be reduced. Further, it is possible to prevent the preheated material W from being cooled before being conveyed to the electric furnace 99.

  Further, since the lid body 6 is provided on the fixed frame 60 arranged in the middle of the track 22 so as to be able to switch between a horizontal posture and an inclined posture so as to be swingable, the lid body 6 can be easily and with respect to the drum 2. It is possible to smoothly switch between the covered state and the non-covered state. The material W can be charged into the drum 2 and the material can be supplied from the drum 2 to the electric furnace 99 quickly and smoothly.

  Further, a receiving hopper 92 into which the material W from the material storing unit 90 is input is provided between the material storing unit 90 and the lid body 6, and the receiving hopper 92 has a receiving chute 93 at the lower end opening. Since the material receiving posture is inclined upward and forward, the receiving chute 93 is inclined downward and the receiving hopper 92 is provided so as to be able to run left and right, the material receiving posture of the drum 2 is the same as or slightly the same as the preheating posture. Therefore, the posture changing time and energy consumption by the tilting means 3 can be reduced.

1 cart 2 drum 3 tilting means 5 rotating means 6 lid
20 opening
22 orbit
60 Fixed frame
61 Burner
90 Material storage
92 Receiving hopper
93 Receiving chute
99 Electric furnace W Material

Claims (2)

A carriage (1) that can reciprocate along an orbit (22) between an electric furnace (99) and a material storage part (90) in which material (W) to be supplied to the electric furnace (99) is stored. Prepared,
The cart (1) has a material accommodating drum (2) having an opening (20), and tilting the drum (2) so as to correspond to a material receiving posture, a preheating posture, and a material discharging posture, respectively. Means (3) and rotating means (5) for rotating the drum (2) to stir the material (W) in the drum (2),
In the middle of the track (22), there is provided a cover (6) with a burner (61) capable of being applied as a cover state to the opening (20) of the drum (2),
Further, a receiving hopper (92) into which the material (W) from the material storage unit (90) is introduced between the material storage unit (90) and the lid body (6) is disposed on the track (22). The receiving hopper (92) has a receiving chute (93) inclined downward at the lower end opening.
After the material (W) is accommodated in the drum (2) in a material reception posture inclined upward in the forward direction via the reception chute (93) of the reception hopper (92), the reception hopper (92) is The vehicle was moved in the horizontal direction and escaped from the traveling locus of the carriage (1) in plan view, and the carriage (1) traveled forward and held in an inclined preheating posture by the tilting means (3). The lid (6) is put into a cover state with respect to the opening (20) of the drum (2), and the drum (2) in a preheated posture is driven to rotate by the rotating means (5) and the application is performed. The burner (61) of the lid body (6) in the lid state is burned to raise the temperature of the material (W) to a predetermined preheating temperature. Thereafter, the lid body (6) is brought into a non-covered state, and the cart ( 1) arrives near the electric furnace (99), and the drum (2) is moved by the tilting means (3). Change in the material discharging position of the square under 傾状, electric furnace for material supply system, characterized in that preheated above material (W) supplied to the electric furnace (99).   The electric furnace according to claim 1, wherein the lid (6) is provided on a fixed frame (60) disposed in the middle of the track (22) so as to be able to switch between a horizontal posture and an inclined posture. Material supply system.

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