JP4640849B2 - Mobile worktable - Google Patents

Description

  More specifically, the present invention relates to a movable workbench, and more particularly, a cast floor that has been peeled off from the inner surface of an exhaust gas hood of a working floor provided at a predetermined height position of a converter in copper smelting is dropped. The present invention relates to a movable workbench that can be folded by pulling a predetermined range of the actual floor near the converter side to the lower side of the actual floor.

About the copper smelting, the outline | summary is demonstrated in patent documents 1 thru | or 3, for example. That is, in the smelting of copper, Cu ₂ S and FeS produced by melting the concentrate in a smelting furnace such as a flash smelting furnace are charged into the converter, and a large number of copper smelters are arranged below the side of the converter. By blowing air or oxygen-enriched air from the tuyere, Fe and S are removed to obtain crude copper having a copper grade of about 98 to 99%, and further electrolytic refining in an aqueous electrolyte solution to obtain 99.99% or more of electrolytic copper. Is done. As shown in FIG. 5, a converter used for copper smelting includes a cylindrical horizontal furnace body 2 generally called a PS converter 1 (Pearce Smith converter), and an upper surface portion thereof has a charging / discharging port. 2a is formed. The interior of the furnace body 2 is lined with a heat-resistant material such as magnesite or chrome magnesite brick. In addition, rollers 1a and 1a that are rotated by an electric motor (not shown) are arranged so as to be in contact with the side surface of the furnace body 2, whereby the furnace body 2 can be tilted. By tilting the furnace body 2 by such a tilting mechanism, charging of mats, cold materials, or the like, or discharging of slag, crude copper, or the like is performed. Furthermore, at the time of operation, as described above, a large number of tuyere 2b for blowing air or oxygen-enriched air is provided, from which air or oxygen-enriched air is directly blown into the mat. .

The operation of the PS converter 1 is a batch type, and the required amount of mats is sent from the smelting furnace of the previous process in each ladle, but for one batch charged in the PS converter 1 There are two types of smelting stages in the mat scouring process, the forging stage and the copper making stage. The preparation period is a step of oxidizing and removing Fe and S in the mat. The oxidized S is removed into the exhaust gas as SO ₂ gas, and since FeO has a high melting point, silicate ore mainly composed of SiO 2 is used as a furnace. The slag having a low melting point is generated by being charged into the inside and bonded to SiO2, and is removed outside the furnace after the completion of the first preparation period.

When the slag is discharged out of the furnace after the end of the first building period, the amount of the solution in the furnace is reduced, and thereafter, an additional mat is charged into the furnace and the second building period is performed. In particular, in the case where the copper quality of the mat produced in the smelting furnace is about 60%, it is common to carry out two cutting periods. The solution in which the slag is finished and the slag is discharged out of the furnace is called “Shirokawa”, the copper grade is around 75%, and it is all Cu ₂ S except for some remaining Fe. After the completion of the steelmaking period, the coppermaking process is started. Here, S in Cu ₂ S is oxidized and removed, and finally, the copper is finished to a crude copper of about 98 to 99%.

Since the exhaust gas generated during the operation of the PS converter 1 contains 7 to 12% of SO ₂ , the exhaust gas hood 5 prevents leakage to the outside, and the exhaust gas is recovered by a suction device (not shown). Manufacturing is in progress. Here, a front hood 6 that is opened and closed while sliding along the exhaust gas hood 5 is disposed on the front side of the exhaust gas hood 5 and is inclined toward the PS converter 1 side at a position facing the front hood 6. A rear jacket 8 is arranged. During operation, the furnace body 2 was rotated so that the charging / discharging port 2a was located inside the exhaust gas hood 5, the front hood 6 was closed, and the gas generated in the furnace was formed in the exhaust gas hood 5. It is sent to the waste heat boiler 7 through the flue 9. The recovered exhaust gas is transported from the exhaust gas hood 5 through the waste heat boiler 7 to a sulfuric acid factory (not shown) and used for the production of sulfuric acid.

During converter operation, the inner surface of the rear jacket 8 close to the charging / discharging port 2a has a so-called “beco” casting in which components such as Cu ₂ S, FeS, and FeO contained in the exhaust gas are coagulated and solidified. It was easy to occur, and this gradually grew along with the operation and blocked the flue 9, and the developed casting suddenly peeled off, causing the operation to be hindered. In particular, the work floor provided in the vicinity of the side surface of the PS converter 1 is a wire mesh work table called a rooster 100, and the cast 30 that peels off from the inner surface of the exhaust gas hood 5 is on the rooster 100. There is a problem that the floor surface is deformed by falling on the floor, or the scaffolding at the time of work is deteriorated to create a dangerous situation for the worker. For this reason, it is necessary to perform a cleaning operation for removing the dropped casting. However, the removal of the casting is not so easy, and the repair and replacement of the rooster 100 have been forced when repairing the converter. Therefore, in order to reduce the burden of cleaning, repair and replacement of the rooster 100 due to casting fall from such an exhaust gas hood, a part of the actual floor surface where casting falls will be used as a movable floor. The idea was to provide a movable workbench that sometimes retracts the movable floor to protect it from casting drops and is flush with the actual floor during work.

  There are several types of movable floors that move up and down in the vertical direction, a type that slides in the horizontal direction, and a type that rotates about 90 °, but avoids falling castings and makes the movable floor flush with the actual floor surface. In order to achieve this, it is preferable that the movable floor be configured to rotate about 90 °. In this regard, as such a movable floor, for example, there is one shown in FIG. 9 of Patent Document 4 (Japanese Patent Laid-Open No. 09-268788). This movable floor is configured by pivotally supporting one end of the movable floor and connecting the shaft of the hydraulic cylinder directly to the back surface of the movable floor, closing the opening when the hydraulic cylinder is extended, and when the hydraulic cylinder is contracted. The opening is opened.

JP-A-11-256250 JP-A-11-335750 JP-A-11-335751 JP 09-268788 A

  However, in the case of a configuration in which the movable floor as shown in Patent Document 4 is directly moved by a hydraulic cylinder, the stroke of the hydraulic cylinder must be made long, and the hydraulic cylinder main body accompanying expansion and contraction of the hydraulic cylinder must be taken. There is a problem that the swing angle becomes large. In order to attach to the actual floor surface for work in the existing converter equipment, it is necessary to arrange the drive system etc. in a limited space as compactly as possible and to move the movable floor with less movement.

  Therefore, the present invention provides a movable floor with a compact drive system in order to reduce the burden of cleaning, repairing, and replacing roastles caused by casting drops from the exhaust gas hood of a PS converter, and is movable during work with less movement. It is an object of the present invention to provide a movable work table in which the floor is positioned so as to be substantially flush with the actual floor surface, and the movable floor can be drawn below the actual floor surface during operation of the converter.

  In order to solve the above-mentioned problem, the present invention according to claim 1 is characterized in that the casting that peels off from the inner surface of the exhaust gas hood among the actual floor surface for work provided at a predetermined height position of the converter in copper smelting. In a movable workbench that can be folded by pulling a predetermined range of the actual floor surface near the falling converter side to the lower side of the actual floor surface, it has a movable floor and a bent portion that supports the movable floor. The arm is attached to the lower side of the actual floor, and is supported on the bearing at a predetermined angle with respect to the arm. The arm is interlocked with the arm by rotating it around the bearing. A pressure receiving plate that rotates the pressure receiving plate, and a drive device that rotates the pressure receiving plate, and the movable floor attached to the arm is rotated by rotating the pressure receiving plate by the driving device, thereby moving the movable floor to the actual floor. Face and almost face Characterized in that it is adapted to movable between a position drawn on the lower side of the actual floor from become such a position.

  In order to solve the above-mentioned problem, the present invention described in claim 2 is the movable workbench according to claim 1, wherein the drive device is a pressure cylinder that applies a pressing force by linearly moving the shaft, The arm is rotated through the pressure receiving plate by connecting the tip of the shaft to the pressure receiving plate.

  In order to solve the above-mentioned problems, the present invention as claimed in claim 3 is the movable workbench according to claim 1 or 2, wherein the movable floor and the actual floor surface are substantially flush with each other. It further comprises a fixing means for fixing to the floor surface.

  In order to solve the above-mentioned problem, the present invention according to claim 4 is the movable workbench according to any one of claims 1 to 3, wherein the movable floor is located below the actual floor surface. When retracted, it is characterized in that it is positioned at least inside a perpendicular passing through the tip position of the actual floor surface.

According to the movable workbench according to the present invention, since the movable floor is rotated via the pressure receiving plate attached to the bearing at a predetermined angle with respect to the arm, the drive system can be arranged in a compact manner. In addition, the driving device can also rotate the movable floor with less movement.
Moreover, since the movable floor can be rotated from a position that is substantially flush with the actual floor surface to a position that is drawn below the actual floor surface, it is possible to prevent casting from falling on the work table. There is an effect. As a result, there is no need to perform casting removal work, and the burden of repairing and replacing the rooster can be greatly reduced.

  Hereinafter, the movable workbench according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional side view of a converter facility provided with an embodiment of a movable workbench according to the present invention. In addition, since the outline | summary of a converter equipment is as having demonstrated in the term of background art, the same code | symbol is attached | subjected to the same structure as it, and the description is abbreviate | omitted.

  As shown in FIG. 1, the movable workbench 10 is provided at a place where the rooster 100 is conventionally attached. That is, as shown in FIG. 2 and FIG. 3, the exhaust gas hood 5 inner surface, particularly the inner surface of the rear jacket 8, among the actual floor surface F for work provided at a predetermined height position with respect to the PS converter 1. A predetermined range of the actual floor surface F in the vicinity of the PS converter 1 side where the casting that has been peeled off falls is formed as the movable floor 20. The illustrated movable worktable 10 generally includes a movable floor 20, an arm 23 that supports the movable floor 20, a bearing 40 that pivotally supports one end of the arm 23, and a pressure receiving plate 27 that rotates the arm 23. The driving device 30 is configured to rotate the pressure receiving plate 27.

  The actual floor surface F is a concrete floor surface installed at a height that reaches the vicinity of the cylindrical side surface of the PS converter 1, and is used when various operations are performed on the PS converter 1. . Then, as shown in FIG. 3, a part of the actual floor surface F where the fallen cast 30 peeled off from the inner surface of the exhaust gas hood 5, particularly the inner surface of the rear jacket 8 falls, is removed in a concave shape. A rectangular movable floor 20 is arranged so as to complement the removed portion. The movable floor 20 is preferably a network-structured rostral as in the prior art in order to reduce the weight while ensuring strength to reduce the operation burden of the driving device described later, but is particularly limited to this. For example, it can also be set as the plate-like body which laid the refractory material. Note that a protective plate 11 for preventing the dropped casting from entering the lower side of the actual floor surface F is provided on the lower side of the actual floor surface F in a range that does not hinder the movement of the movable floor 20. .

  An arm 23 having a bent portion 23a bent at a predetermined angle is attached to the bottom surface of the movable floor 20. As shown in FIG. 3, the arms 23 are arranged as a pair on the left and right bottom surfaces of the movable floor 20, and the ends opposite to the side fixed to the movable floor 20 are respectively bearings 40. It is attached to be able to rotate. The left and right bearings 40 are attached to a frame 50 installed on the lower side of the actual floor surface F, and the surface of the movable floor 20 and the actual floor surface F are rotated by rotating the arm 23 around the bearing 40 as a rotation center. The surface of the movable floor 20 is drawn to the lower side of the actual floor surface F from a position where the surface of the movable floor 20 is substantially flush with the vertical surface L at least through the tip position of the actual floor surface F. It can move between positions that are inside. This prevents the casting 30 from dropping directly onto the movable floor 20 by pulling the movable floor 20 below the actual floor F during operation of the PS converter 1, and causes the movable floor 20 during operation. By performing the work flush with the actual floor surface F, it is possible to greatly reduce the burden of cleaning, repairing and replacing the work table. In addition, since the arm 23 is provided with the bent portion 23a, the distance between the movable floor 20 and the bearing 40 when the movable floor 20 is flush with the actual floor surface F can be shortened.

  The arm 23 is rotated by the driving device 30 via the pressure receiving plate 27. That is, the arm 23 is attached to the bearing 40 so as to rotate in conjunction with the rotation of the pressure receiving plate 27. Here, the driving device 30 is formed by a pressure cylinder that rotates the pressure receiving plate 27 by linearly moving the shaft 31, for example, a hydraulic cylinder such as a hydraulic cylinder, an air cylinder, and the like. A pressure receiving plate 27 attached to 40 is connected by a connecting portion 33. Further, the pressure receiving plate 27 is attached to the arm 23 at a predetermined angle, for example, an angle of about 60 °, with the bearing 40 as the center, and is configured so that the connecting portion 33 is positioned as close to the shaft 31 as possible. . As a result, the arm 23 can be rotated so that the movable floor 20 is positioned at a predetermined position with a small movement of the driving device 30. Further, as shown in FIG. 2, the connecting portion 33 between the shaft 31 and the pressure receiving plate 27 moves in an arc shape as the shaft 31 advances and retracts. Therefore, in the present embodiment, the support portion 35 serves as the driving device 30. A center trunnion type air cylinder is used which can swing around the center. By configuring the drive mechanism of the arm 23 in this way, the stroke of the shaft 31 can be shortened, and the swing angle of the cylinder body accompanying the advancement / retraction of the shaft 31 can be further reduced. Therefore, the drive system can be compactly arranged below the actual floor surface F.

  The illustrated movable workbench 10 further includes a fixing means 60 for fixing the movable floor 20 to the actual floor surface F when the movable floor 20 and the actual floor surface F are substantially flush with each other. The fixing means 60 is provided between the first fixed plate 61 provided at both side edges of the movable floor 20 and the actual floor surface F at a position facing when the movable floor 20 is flush with the actual floor surface F. The second fixing plate 65 is provided. The first fixing plate 61 and the second fixing plate 65 have through holes 61a and 65a, respectively, and are opposite to the surface of the second fixing plate 65 facing the first fixing plate 61. A fixing rod 67 bent at a right angle toward the upper side is attached to the surface. Then, the fixing pin 69 bent at a right angle at two positions with the first fixing plate 61 and the second fixing plate 65 facing each other is hooked to the fixing rod 67 while being inserted into the through holes 61a and 65a. By doing so, the movable floor 20 can be reliably fixed to the actual floor surface F.

  Next, the operation of the movable workbench according to the present invention will be described. First, when the movable floor 20 is caused to be in a workable state, as shown in FIG. 2, the driving device 30 is operated to advance the shaft 31, thereby rotating the pressure receiving plate 27 around the bearing 40. Let When the pressure receiving plate 27 is rotated, the arm 23 is rotated by the same angle as the pressure receiving plate 27 and the movable floor 20 is flush with the actual floor F. When the movable floor 20 is flush with the actual floor surface F, the movable floor 20 is fixed to the first fixed plate 61 provided on the left and right sides of the movable floor 20 and the second fixed plate 65 provided on the actual floor surface F, respectively. The movable floor 20 is fixed to the actual floor surface F by inserting the pins 69.

  On the other hand, when the movable floor 20 is pulled into the lower part of the actual floor surface F, the fixing means 60 on both sides of the movable floor 20 is released, the driving device 30 is operated, the shaft 31 is pulled in, and the pressure receiving plate 27 is thereby driven. Turn to 30 side. When the pressure receiving plate 27 is rotated, the arm 23 is rotated by the same angle as the pressure receiving plate 27 in conjunction therewith, and the movable floor 20 is drawn below the actual floor surface F. By performing the converter operation in this state, even if the casting falls, it does not directly contact the movable floor 20 and prevents the movable floor 20 from being soiled or damaged. In addition, since the movable floor 20 is in a substantially vertical state below the actual floor surface F, it is possible to prevent the casting that has fallen together with the protective plate 11 from entering the lower side of the actual floor surface F.

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As described above, the preferred embodiment of the present invention has been described in detail. However, the present invention is not limited to the specific embodiment, and within the scope of the gist of the present invention described in the claims, Needless to say, various modifications and changes are possible.

It is side surface sectional drawing which shows the outline | summary of one Embodiment of the converter equipment provided with the movable workbench which concerns on this invention. It is a side view which shows the outline | summary of one Embodiment of the movable worktable which concerns on this invention. It is a top view of the movable workbench shown in FIG. It is a perspective view which shows a fixing means. It is side surface sectional drawing which shows the outline | summary of the conventional converter equipment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Movable worktable 11 Guard plate 20 Movable floor 23 Arm 23a Bending part 27 Pressure receiving plate 40 Bearing 30 Drive unit 31 Shaft 33 Connecting part 35 Support part 50 Frame 60 Fixing means 61 First fixing plate 61a Through hole 65 Second Fixed plate 65a Through hole 67 Fixed rod 69 Fixed pin F Actual floor L Vertical

Claims (4)

Of the actual floor surface for work provided at a predetermined height position of the converter in copper smelting, the predetermined range of the actual floor surface in the vicinity of the converter side where the casting peeled off from the inner surface of the exhaust gas hood falls. In a movable workbench that can be folded so as to be pulled under the actual floor surface,
A movable floor,
An arm having a bent portion for supporting the movable floor;
A bearing attached to the lower side of the actual floor surface and supporting one end of the arm;
A pressure receiving plate that is attached to the bearing at a predetermined angle with respect to the arm, and that rotates the arm in conjunction with the bearing by rotating the bearing around the bearing;
A driving device for rotating the pressure receiving plate;
With
The movable floor attached to the arm is rotated by rotating the pressure receiving plate by the driving device, and thereby the actual floor surface is positioned so as to be substantially flush with the actual floor surface. A movable workbench characterized in that it is movable between positions retracted below. The movable workbench according to claim 1,
The drive device is a pressure cylinder that applies a pressing force by linearly moving the shaft, and the arm is rotated via the pressure receiving plate by connecting the tip of the shaft to the pressure receiving plate. A movable workbench characterized by that. In the movable workbench according to claim 1 or 2,
A movable workbench further comprising fixing means for fixing the movable floor to the actual floor surface when the movable floor and the actual floor surface are substantially flush with each other. In the movable workbench characterized by the above-mentioned in any 1 to 3,
The movable workbench characterized in that the movable floor is positioned inside at least a vertical line passing through a tip position of the actual floor surface when retracted to the lower side of the actual floor surface.

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