Cold iron source input method and input equipment

Abstract

The present invention provides a method and equipment for introducing a cold iron source that allows for the safe introduction of the cold iron source into a molten iron transport container, even when molten iron remains in the molten iron transport container. [Solution] The method for introducing a cold iron source into a molten iron transport container involves preparing heavy machinery equipped with a lifting magnet, and having an operator remotely control the heavy machinery to lift the cold iron source with the lifting magnet and place it into the molten iron transport container.

Description

Technical Field

[0001] The present invention relates to a cold iron source input method and input equipment for inputting a cold iron source into a hot metal transportation device.

Background Art

[0002] The iron source used in the steelmaking process of an integrated steelworks mainly consists of hot metal obtained by reducing iron ore in a blast furnace, but inexpensive cold iron sources such as iron scrap are also widely used. In the production of hot metal in a blast furnace, a large amount of energy is consumed and a large amount of CO2 is emitted when reducing iron ore, whereas a cold iron source only requires the heat of fusion. Therefore, from the viewpoints of energy conservation and CO2 reduction, an improvement in the blending ratio of the cold iron source in the steelmaking process is desired.

[0003] Conventionally, the cold iron source was mainly charged into a converter and melted by utilizing the heat generated by the decarburization refining of hot metal. In recent years, in order to increase the blending ratio of the cold iron source, a method has also been practiced in which the cold iron source is placed in a hot metal transportation container (a hot metal mixer or a hot metal ladle) for transporting hot metal from a blast furnace to a converter, and then the cold iron source is melted by utilizing the heat of the hot metal and the hot metal transportation container when receiving the hot metal (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] The input of the cold iron source into the hot metal transportation container is carried out by a chute or a crane with a lifting magnet. However, when hot metal remains in the hot metal transportation container, there is a risk that the hot metal will scatter. Therefore, the method using a crane cannot be carried out from the viewpoint of ensuring the safety of workers, and there is a problem that it leads to a decrease in the blending ratio of the cold iron source.

[0006] Therefore, the present invention provides a method and equipment for introducing a cold iron source that allows for the safe introduction of a cold iron source into a molten iron transport container, even when molten iron remains in the molten iron transport container. [Means for solving the problem]

[0007] To solve the above problems, the present invention provides the following [1] to [8].

[0008] [1] A method for introducing a cold iron source into a molten iron transport container, Prepare heavy machinery equipped with a lifting magnet. A method for supplying cold iron, wherein an operator remotely controls the heavy machinery to place the cold iron source, lifted by the lifting magnet, into the molten iron transport container.

[0009] [2] The method for introducing a cold iron source as described in [1], wherein the remote operation of the heavy machinery is performed by an operator while observing the heavy machinery.

[0010] [3] A method for introducing a cold iron source into a molten iron transport container, Prepare heavy machinery equipped with a lifting magnet. The operator remotely controls the heavy machinery to place the cold iron source lifted by the lifting magnet into the molten iron transport container. At that time, multiple television cameras are installed to photograph the area in front of the heavy machinery and the working area of ​​the heavy machinery. A method for feeding a cold iron source, comprising transmitting images captured by the aforementioned multiple television cameras wirelessly or via wired connection to a monitor installed at the location where the worker performs the remote operation, and the worker remotely operating the heavy machinery while viewing the images displayed on the monitor.

[0011] [4] The plurality of television cameras, Multiple first television cameras are attached to the heavy machinery and capture images of the area in front of the driver's seat of the heavy machinery, Multiple second television cameras are attached to the aforementioned heavy machinery and capture images from above the driver's seat of the heavy machinery, Multiple third television cameras, which are fixed cameras that are installed in the work area where the cold iron source is introduced, are installed to monitor the cold iron source introduction process. A method for introducing a cold iron source according to [3], comprising:

[0012] [5] A cold iron source feeding device for feeding a cold iron source into a molten iron transport container, A heavy machine equipped with a lifting magnet for loading a cold iron source into the molten iron transport container, A remote control command device that allows an operator to remotely control the heavy machinery to load the cold iron source lifted by the lifting magnet into the molten iron transport container, A cold iron source feeding device having the following features.

[0013] [6] The remote control command device is installed in a position where the operator can see the heavy machinery, The cold iron source feeding device described in [5], wherein the operator remotely controls the heavy machinery while observing it.

[0014] [7] A cold iron source feeding device for feeding a cold iron source into a molten iron transport container, A heavy machine equipped with a lifting magnet for loading a cold iron source into the molten iron transport container, Multiple television cameras that photograph the front of the heavy machinery and the working area of ​​the heavy machinery, A remote control command device that allows an operator to remotely control the heavy machinery to load the cold iron source lifted by the lifting magnet into the molten iron transport container, The video footage captured by the aforementioned multiple television cameras is transmitted wirelessly or via wired connection, and the video footage is displayed on a monitor positioned where the operator operating the remote control device can see it. It has, A cold iron source feeding device in which an operator remotely controls the heavy machinery using the remote control command device while viewing the image displayed on the monitor.

[0015] [8] The plurality of television cameras, Multiple first television cameras are attached to the heavy machinery and capture images of the area in front of the driver's seat of the heavy machinery, A plurality of second television cameras attached to the heavy machine and photographing from above the driver's seat of the heavy machine. A plurality of third television cameras that are fixed to the work site where the operation of loading the cold iron source is performed and that monitor the operation of loading the cold iron source. The cold iron source charging device according to [7], comprising:

Advantages of the Invention

[0016] According to the present invention, even when molten iron remains in the molten iron transport container, the operation of charging the cold iron source into the molten iron transport container can be performed safely.

Brief Description of the Drawings

[0017] [Figure 1] It is a schematic diagram showing the entire equipment for cold iron source charging used in the implementation of the cold iron source charging method according to the embodiment. [Figure 2] It is a schematic diagram showing a state where the cold iron source charging method according to the first embodiment is being implemented. [Figure 3] It is a functional block diagram showing the cold iron source charging equipment used in the cold iron source charging method according to the first embodiment. [Figure 4] It is a schematic diagram showing a state where the cold iron source charging method according to the second embodiment is being implemented. [Figure 5] It is a functional block diagram showing the cold iron source charging equipment used in the cold iron source charging method according to the second embodiment. [Figure 6] It is a perspective view specifically showing an example of the actual situation of the remote operation unit in the second embodiment.

Modes for Carrying Out the Invention

[0018] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1 is a schematic diagram showing the overall equipment for introducing a cold iron source used in the implementation of the cold iron source introduction method according to the embodiment. The overall equipment for introducing a cold iron source is installed in the middle of a railway line 3 that transports a molten iron transport container, the molten iron ladle 1, between a blast furnace (not shown) and a steelmaking plant 2. Two railway lines 3 are provided, and the molten iron ladle 1 can travel on each of them. Multiple molten iron ladles 1 (four in the figure) travel on the railway line 3 in a connected state. In this area, scrap storage areas 4 for accumulating scrap, which is the cold iron source, are provided outside the two railway lines 3. Between the railway lines 3 and the scrap storage areas 4, stages 7 on which heavy machinery can travel are provided. On the stages 7, multiple work areas (storage areas) are provided at predetermined intervals for heavy machinery to place (introduce) the scrap 6, which is the cold iron source, into the molten iron ladle 1. Furthermore, a hydraulic excavator 5 is used as heavy machinery, and the hydraulic excavator 5 constitutes part of the cold iron source input equipment for carrying out the cold iron source input method of this embodiment. The hydraulic excavator 5, which is heavy machinery, is equipped with a lifting magnet for attracting scrap 6 as described later, and is configured to be operated remotely. The two stages 7 are connected by a travel path 8, and the hydraulic excavator 5 can travel to either of the two stages 7 via the travel path 8. The hydraulic excavator 5 is configured to perform the operation of inputting scrap 6, which is the cold iron source, while stopped in the work area, and is configured to travel between work areas. Scrap 6, which will become the cold iron source, is accumulated in the scrap storage area 4 by truck 9.

[0019] In this overall facility for supplying cold iron, the empty molten iron ladle 1, after the molten iron received in the previous batch has been discharged to the converter, is stopped at a position corresponding to a designated work area on the stage 7, the hydraulic excavator 5 is stopped at that work area, and the hydraulic excavator 5 is remotely operated as described below to supply scrap 6 from the scrap area 4 into the molten iron ladle 1 using the supply method described below.

[0020] First, the method for introducing the cold iron source according to the first embodiment will be described. Figure 2 is a schematic diagram showing the cold iron source input method according to the first embodiment, and Figure 3 is a functional block diagram showing the cold iron source input equipment used in the cold iron source input method according to the first embodiment.

[0021] In this embodiment, as shown in Figure 2, a hydraulic excavator 5 equipped with a lifting magnet is used as heavy machinery to load scrap 6, which is a cold iron source, into the molten iron transport container, the molten iron ladle 1. As shown in Figure 3, the cold iron source loading equipment 20 includes this hydraulic excavator 5 and a remote control unit 21 for remotely controlling the hydraulic excavator 5. The remote control command device 22 of the remote control unit 21 remotely controls the hydraulic excavator 5 to load the scrap 6 into the molten iron ladle 1.

[0022] The following provides a more detailed explanation. As shown in Figure 2, the hydraulic excavator 5 comprises a main body 11, a crawler 12, a boom 13, an arm 14, and a lifting magnet 15. The hydraulic excavator 5 also further includes a control device 16 and a drive unit 17, as shown in Figure 3. The main body 11 has a driver's cab 11a with a driver's seat inside. The lifting magnet 15 is located at the tip of the arm 14.

[0023] The hydraulic excavator 5, a heavy machine, is stopped in the work area at a designated position on Stage 7. With the molten iron that was previously received discharged into the converter, the scrap 6, which is the cold iron source, is dropped into the empty ladle 1 using a lifting magnet 15. Specifically, the scrap 6, which is the cold iron source, is a ferromagnetic material. The scrap 6 is lifted with the lifting magnet 15 magnetized, and then the lifting magnet 15 is moved onto the ladle 1. After that, the lifting magnet 15 is demagnetized, causing the scrap 6 to fall into the ladle 1 and be placed inside the ladle 1.

[0024] The remote control command device 22 shown in Figure 3 consists of, for example, a telecontrol unit, and the hydraulic excavator 5 is remotely controlled by remote control commands from the remote control command device 22. The remote control commands from the remote control command device 22 are transmitted wirelessly to the control device 16 of the hydraulic excavator 5, and the control device 16 controls the drive unit 17 and the lifting magnet 15 based on the remote control commands.

[0025] The hydraulic excavator 5 can be remotely controlled by modifying its internal hydraulic circuit or by directly attaching a remotely controllable attachment to levers, pedals, etc., inside the operator's cab. The operator uses the remote control command device 22 to control the movement of the hydraulic excavator 5, the operation of the arm 14 and boom 13, and the excitation and demagnetization of the lifting magnet 15. The remote control unit 21 is located in a place where there is no risk of molten iron splashing when the scrap 6, which is the cold iron source, is put into the molten iron ladle 1, and the operator can remotely control the hydraulic excavator 5 using the remote control command device 22 while observing the excavator 5. Therefore, the work can be performed more safely than when the operator is directly on board the hydraulic excavator (heavy machinery) 5. Although Figure 3 shows an example of wireless transmission of commands from the remote control command device 22, a wired connection may also be used.

[0026] Next, a method for introducing the cold iron source according to the second embodiment will be described. Figure 4 is a schematic diagram showing the cold iron source input method according to the second embodiment, and Figure 5 is a functional block diagram showing the cold iron source input equipment used in the cold iron source input method according to the second embodiment.

[0027] In this embodiment, as shown in Figure 4, a hydraulic excavator 5' equipped with a lifting magnet is used as heavy machinery to load scrap 6, which is a cold iron source, into the molten iron transport container, the molten iron ladle 1. As shown in Figure 5, the cold iron source loading equipment 20' includes this hydraulic excavator 5', a remote control unit 21' for remotely operating the hydraulic excavator 5', and a group of television cameras 30 consisting of multiple television cameras that film the status of the scrap 6 loading operation by the hydraulic excavator 5'. Based on the images captured by the group of television cameras 30, the hydraulic excavator 5' is remotely operated by the remote control command device 22 of the remote control unit 21' to load the scrap 6 into the molten iron ladle 1.

[0028] The following provides a more detailed explanation. As shown in Figure 4, the hydraulic excavator 5', like the hydraulic excavator 5 of the first embodiment, has a main body 11, a crawler 12, a boom 13, an arm 14, and a lifting magnet 15, and as shown in Figure 5, it further has a control device 16 and a drive unit 17. The main body 11 has an operator's cab 11a, and the lifting magnet 15 is provided at the tip of the arm 14, which is also the same as the hydraulic excavator 5.

[0029] The hydraulic excavator 5', a heavy machine, is stopped in the work area, which is a predetermined position on the stage 7, similar to the hydraulic excavator 5 of the first embodiment. In this state, scrap 6, which is a cold iron source, is placed in the empty molten iron ladle 1, which has been discharged to the converter after the molten iron received in the previous operation, using a lifting magnet 15.

[0030] The television camera group 30 includes, for example, as shown in Figure 4, a plurality of first television cameras 18 mounted on the front part of the operator's cab 11a of the hydraulic excavator 5', a plurality of second television cameras 19 mounted on the upper part of the operator's cab 11a, and a plurality of third television cameras 25 fixed to the work area. That is, the first television cameras 18 and the second television cameras 19 are included in the hydraulic excavator 5', while the third television cameras 25 are provided separately from the hydraulic excavator 5'. The first television cameras 18 are on-board forward cameras that photograph the area in front of the operator's seat, for example, in front of and to the left and right of the operator's seat, and capture the forward field of view as seen from the operator's seat of the hydraulic excavator 5', and for example, three of them are provided. The second television cameras 19 are on-board overhead cameras that are mounted above the operator's seat and photograph the front, rear, left and right from above the hydraulic excavator 5', and for example, four of them are provided. The third television camera 25 is a ground-based fixed-point surveillance camera for monitoring the process of adding scrap 6, which is a cold iron source, to the molten iron ladle 1, and for example, four of these cameras may be installed.

[0031] The remote control command device 22 of the remote control unit 21' consists of, for example, a telecontrol, similar to the first embodiment, and the hydraulic excavator 5' is remotely controlled by remote control commands from the remote control command device 22. The remote control commands from the remote control command device 22 are transmitted wirelessly to the control device 16 of the hydraulic excavator 5', and the control device 16 controls the drive unit 17 and the lifting magnet 15 based on the remote control commands.

[0032] The remote control unit 21' includes a remote control command device 22, a receiver 23, a first monitor 24, and a second monitor 26. The receiver 23 wirelessly receives video from the first television camera (forward-facing camera) 18 and the second television camera (overhead-facing camera) 19 of the television camera group 30. The first monitor 24 is connected to the receiver 23 and displays video captured by the first television camera (forward-facing camera) 18 and the second television camera (overhead-facing camera) 19. The third television camera (ground-based fixed-point surveillance camera) 25 of the television camera group 30 is wired to the second monitor 26, and video captured by the third television camera 25 is displayed. As will be described later, the first monitor 24 and the second monitor 26 are positioned so that the operator operating the remote control command device 22 can see them. A portion of the third television camera (ground-based fixed-point surveillance camera) 25 may be positioned at a height that allows the bottom of the molten iron ladle 1 to be seen, so that the amount of residual molten iron in the ladle 1 can be monitored. In Figure 5, the command from the remote control device 22, as well as the video footage captured by the first television camera (forward-facing camera) 18 and the second television camera (overhead-view camera) 19, are shown to be transmitted wirelessly, but they may also be transmitted via wire. In addition, the video footage from the television camera 25 is transmitted to the second monitor 26 via wire, but it may also be transmitted wirelessly.

[0033] Similar to the hydraulic excavator 5 of the first embodiment, the hydraulic excavator 5' can be made remotely controllable by modifying the internal hydraulic circuit to allow remote operation, or by directly attaching a remotely controllable attachment to levers, pedals, etc., inside the operator's cab. Similar to the first embodiment, the operator uses the remote control command device 22 to operate the hydraulic excavator 5' for travel, the operation of the arm 14 and boom 13, and the excitation and demagnetization of the lifting magnet 15. The remote control unit 21' is located in a place where there is no risk of molten iron scattering when the scrap 6, which is the cold iron source, is put into the molten iron ladle 1. The operator operates the hydraulic excavator 5' while checking the positions of the scrap 6, which is the cold iron source, and the molten iron ladle 1, as well as the safety of the area around the work area, by looking at the images on the first monitor 24 and the second monitor 26, and puts in the scrap 6, which is the cold iron source.

[0034] An example of the actual situation of the remote control unit 21' at this time will be explained in detail with reference to Figure 6. Figure 6 is a perspective view specifically illustrating an example of the actual situation of the remote control unit 21'. As shown in Figure 6, the remote control unit 21' is equipped with a driver's seat 27 with a configuration similar to that of an actual hydraulic excavator 5', and the first monitor 24 and the second monitor 26 are positioned so that the worker 28 sitting in the driver's seat 27 can see them. The worker 28 sitting in the driver's seat 27 operates the remote control command device 22 while monitoring the first monitor 24 and the second monitor 26. The remote control command device 22 may be configured to allow the worker to perform operations similar to those performed by a worker sitting in the driver's seat of an actual hydraulic excavator 5'.

[0035] In the example shown in Figure 6, the first monitor 24 has four screens and is positioned in front of the operator 28 in the driver's seat 27. The three screens 24a on the lower side display images captured by three first television cameras (forward-facing cameras) 18 that capture images in front of and to the left and right of the driver's seat, respectively. The screen 24b above them displays images from four second television cameras (overhead cameras) 19 that capture overhead views from the front, back, left, and right above the driver's seat, divided into four sections. The second monitor 26 is positioned to the right of the operator 28 in the driver's seat 27 and displays images from four third television cameras (ground-based fixed-point monitoring cameras) 25, divided into four sections. It is preferable that the screens of the first monitor 24 and the second monitor 26 are positioned so that the operator 28 in the driver's seat 27 can see them at a glance.

[0036] The operator loads the scrap 6, which is the source of cold iron, while viewing the images captured by multiple television cameras in the television camera group 30 and displayed on the first monitor 24 and the second monitor 26. Specifically, the images captured by the first television camera (forward-facing camera on top of the machine) 18 and the second television camera (overhead-view camera on top of the machine) 19 are displayed on the first monitor 24, and the images captured by the third television camera (ground-based fixed-point monitoring camera) 25 are displayed on the second monitor 26. The operator loads the scrap 6, which is the source of cold iron, while viewing these first and second monitors 24 and 26. During the loading of the scrap 6, the operator grasps the forward view from the driver's seat using the images captured by the first television camera (forward-facing camera on top of the machine) 18, and grasps the situation in front, behind, and to the left and right of the hydraulic excavator 5' using the images captured by the second television camera (overhead-view camera on top of the machine) 19. The images captured by the first television camera (forward-facing camera on board) 18 and the second television camera (overhead-view camera on board) 19 are also used for monitoring the surroundings when the hydraulic excavator 5' is moved between work areas. This monitoring is performed to prevent the hydraulic excavator 5' from colliding with obstacles or people along its path. In addition, the images captured by the third television camera (ground-based fixed-point monitoring camera) 25 are used for monitoring the surroundings of the work area when the scrap 6, which is the cold iron source, is being fed into the molten iron ladle 1.

[0037] In this embodiment as well, the remote control unit 21' is located in a place where there is no risk of molten iron scattering when the scrap 6, which is the cold iron source, is put into the molten iron ladle 1. The operator can remotely control the unit using the remote control command device 22, so the work can be performed more safely compared to when the operator directly gets into the hydraulic excavator (heavy machinery) 5' and performs the work.

[0038] Furthermore, in this embodiment, as described above, in the cold iron source input equipment, the molten iron ladle 1, which is the work target, and the surrounding work area are photographed by multiple television cameras, and the photographed images are displayed on multiple screens of the first monitor 24 and the second monitor 26, so that the worker can work while thoroughly checking the situation of the molten iron ladle 1 and the surrounding work area. In addition, by combining multiple viewpoints using multiple types of cameras, in particular, by combining the image taken by the second television camera (overhead camera on the machine) 19 and the image taken by the third television camera (ground fixed-point monitoring camera) 25, the worker can be given a sense of depth (especially the depth of the molten iron ladle), making it easier to input scrap (cold iron source) 6 into the molten iron ladle 1. Moreover, by displaying multi-viewpoint images from multiple types of cameras on the first monitor 24 and the second monitor 26 so that the worker can take a quick look, good visibility can be obtained.

[0039] Although embodiments of the present invention have been described above, these should be considered merely illustrative and not restrictive. The above embodiments may be omitted, substituted, or modified in various ways without departing from the spirit of the present invention.

[0040] For example, in the above embodiment, a molten iron ladle was used as the molten iron transport container, but other containers such as a molten iron mixing truck may be used. Also, in the example, a hydraulic excavator was used as the heavy machinery, but other heavy machinery may be used. [Explanation of Symbols]

[0041] 1. Molten iron pot (molten iron transport container) 2 Steelmaking plants 3 railroad tracks 4. Scrapyard 5.5' Hydraulic excavator (heavy machinery) 6. Scrap (cold iron source) 7 Stages (Workshop) 8. Driving path 11 Main unit 11a Driver's cab 12 Crawler 13 Boom 14 Arms 15 Lifting Magnets 16 Control device 17 Drive Unit 18. First television camera 19. Second television camera 20, 20´ cold iron source input equipment 21, 21' Remote Control Unit 22 Remote Control Command Device 23 Receiver 24. First Monitor 25. Third television camera 26 Second Monitor 27 Driver's seat 28 Workers

Claims

1. A method for introducing a cold iron source into a molten iron transport container, Prepare heavy machinery equipped with a lifting magnet. A method for supplying cold iron, wherein an operator remotely controls the heavy machinery to place the cold iron source, lifted by the lifting magnet, into the molten iron transport container.

2. The cold iron source input method according to claim 1, wherein the remote operation of the heavy machinery is performed by an operator while observing the heavy machinery.

3. A method for introducing a cold iron source into a molten iron transport container, Prepare heavy machinery equipped with a lifting magnet. The operator remotely controls the heavy machinery to place the cold iron source lifted by the lifting magnet into the molten iron transport container. At that time, multiple television cameras are installed to photograph the area in front of the heavy machinery and the working area of ​​the heavy machinery. A method for feeding a cold iron source, comprising transmitting images captured by the aforementioned multiple television cameras wirelessly or via wired connection to a monitor installed at the location where the worker performs the remote operation, and the worker remotely operating the heavy machinery while viewing the images displayed on the monitor.

4. The aforementioned multiple television cameras Multiple first television cameras are attached to the heavy machinery and capture images of the area in front of the driver's seat of the heavy machinery, Multiple second television cameras are attached to the aforementioned heavy machinery and capture images from above the driver's seat of the heavy machinery, Multiple third television cameras, which are fixed cameras that are installed in the work area where the cold iron source is introduced, are installed to monitor the cold iron source introduction process. A method for introducing a cold iron source according to claim 3, comprising:

5. A cold iron source feeding device for feeding a cold iron source into a molten iron transport container, A heavy machine equipped with a lifting magnet for loading a cold iron source into the molten iron transport container, A remote control command device that allows an operator to remotely control the heavy machinery to load the cold iron source lifted by the lifting magnet into the molten iron transport container, A cold iron source feeding device having the following features.

6. The remote control device is installed in a position where the operator can see the heavy machinery. The cold iron source feeding device according to claim 5, wherein the operator remotely controls the heavy machinery while observing it.

7. A cold iron source feeding device for feeding a cold iron source into a molten iron transport container, A heavy machine equipped with a lifting magnet for loading a cold iron source into the molten iron transport container, Multiple television cameras that photograph the front of the heavy machinery and the working area of ​​the heavy machinery, A remote control command device that allows an operator to remotely control the heavy machinery to load the cold iron source lifted by the lifting magnet into the molten iron transport container, The video footage captured by the aforementioned multiple television cameras is transmitted wirelessly or via wired connection, and the video footage is displayed on a monitor positioned where the operator operating the remote control device can see it. It has, A cold iron source feeding device in which an operator remotely controls the heavy machinery using the remote control command device while viewing the image displayed on the monitor.

8. The aforementioned multiple television cameras Multiple first television cameras are attached to the heavy machinery and capture images of the area in front of the driver's seat of the heavy machinery, Multiple second television cameras are attached to the aforementioned heavy machinery and capture images from above the driver's seat of the heavy machinery, Multiple third television cameras, which are fixed cameras that are installed in the work area where the cold iron source is introduced, are installed to monitor the cold iron source introduction process. A cold iron source feeding device according to claim 7, having the following features.

Images