Method for installing precast blocks

Abstract

To provide an on-furnace crane capable of lifting a material from the outside of a coke oven and installing it in the coke oven.SOLUTION: An on-furnace crane according to the present invention is an on-furnace crane provided on a coke oven, and includes a base installed on a rail of the coke oven, a slewing frame rotatably attached on the base, a jib having a truss structure attached to the slewing frame, and a winch that changes a length of a wire suspended from the jib.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an overhead crane that is installed above a coke oven when, for example, renovating the coke oven. [Background technology]

[0002] As shown in Patent Document 1, when renovating a coke oven, a hydraulic excavator can be placed above the coke oven to carry out work such as transporting materials into the coke oven. Figure 6 shows a conventional hydraulic excavator 5 placed above a coke oven. The hydraulic excavator 5 is lifted from the ground by a crane vehicle and installed on the coke oven ceiling OC. The furnace ceiling OC in Figure 6 is shown in cross section, with a coal charging port CI shown. The underside of the furnace ceiling OC is the combustion chamber and coke chamber (not shown). A rail R is installed above the furnace ceiling OC. The rail R is installed to allow a coal loading car (not shown) to move around to supply coal from the coal charging port CI to the coke chamber.

[0003] In FIG. 6, a rail R for a coal loading car is used, and a mobile carriage 6 is installed on the rail R. The mobile carriage 6 is equipped with wheels 61 and is capable of moving on the rail R. The conventional hydraulic excavator 5 shown in FIG. 6 is a tracked vehicle, and is equipped with crawlers 511 on the lower running body 51. The hydraulic excavator 5 can move on the mobile carriage 6 by rotating the crawlers 511.

[0004] The hydraulic excavator 5 has an upper rotating body 52 that is mounted on a lower traveling body 51 and is rotatable relative to the lower traveling body 51. A base of a boom 53 is rotatably connected to the upper rotating body 52. ​​An arm 54 is rotatably connected to the tip of the boom 53. The boom 53 and the arm 54 can be rotated up and down by hydraulically controlling an arm cylinder 55 or the like. Furthermore, the position of the tip of the arm 54 can be controlled from inside a cabin 56, along with the horizontal rotation of the upper rotating body 52. ​​A counterweight 57 is provided on the upper rotating body 52, along with the boom 53 and cabin 56.

[0005] The tip of the arm 54 of the hydraulic excavator 5 is replaceable, and the hydraulic excavator 5 shown in Figure 6 has had the bucket (not shown) at the tip of the arm 54 removed. A tip mounting hole 541 is exposed at the tip of the arm 54. In Figure 6, the hydraulic excavator 5 is suspending a fire-resistant precast block PB with a gripping device G using a wire W passed through the tip mounting hole 541. A bucket or the like can be attached to the tip mounting hole 541, or a member or the like can be suspended by attaching a wire W. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 2012 / 078036 Summary of the Invention [Problem to be solved by the invention]

[0007] When materials are brought into a coke oven, they are lifted from the ground outside the coke oven onto the furnace ceiling OC. Then, the materials are lowered into the coke oven from a location where there is no furnace ceiling OC. Even if this is done using the hydraulic excavator 5 shown in Figure 6 installed on the furnace ceiling OC, the boom 53 and arm 54 are too short to lift the materials from the ground onto the furnace ceiling OC.

[0008] It may be possible to lift materials and other materials from the ground onto the furnace ceiling OC using a large hydraulic excavator with a long boom and arm. However, the hydraulic excavator 5 in Figure 5 is lifted from the ground GR outside the coke oven by a crane vehicle or the like and installed on the furnace ceiling OC. The hydraulic excavator 5 is designed to be stable due to its own weight when the boom 53 and arm 54 are moved. The hydraulic excavator 5 also has crawlers 511. For this reason, the hydraulic excavator 5 is heavy. If such a hydraulic excavator 5 is made large, it will be difficult to lift it up to above the furnace ceiling OC.

[0009] Furthermore, when lifting materials and the like from the ground, the hydraulic excavator 5 needs to move on the mobile cart 6 in order to bring the tip mounting hole 541 at the tip of the arm 54 outside the coke oven. At this time, the hydraulic excavator 5 moves on the narrow mobile cart 6 using the crawler 511, and it is difficult to maneuver the hydraulic excavator 5 so that it does not fall off the mobile cart 6.

[0010] An object of the present invention is to provide an oven crane that can lift materials from outside a coke oven and place them inside the coke oven. [Means for solving the problem]

[0011] The furnace crane of the present invention is a furnace crane installed above a coke oven, and is characterized by comprising: a base installed on the rails of the coke oven; a rotating frame rotatably mounted on the base; a jib with a truss structure attached to the rotating frame; and a winch for changing the length of the wire suspended from the jib. [Effects of the Invention]

[0012] The truss-structured jib used in the furnace crane of the present invention is long but lightweight, so the tip of the jib can be protruded above the ground outside the coke oven. The furnace crane of the present invention can then lift materials from the ground and place them inside the coke oven. Furthermore, since tower cranes for building construction already exist, a furnace crane can be realized at low cost by utilizing a tower crane with a truss-structured jib. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a side view of an overhead crane according to an embodiment of the present invention installed on the roof of a coke oven. [Figure 2] A perspective view of the reloading area with three rows of combustion chambers reconstructed. [Figure 3] FIG. 2 is a top view of an above-furnace crane according to an embodiment of the present invention installed on the furnace roof of a coke oven. [Figure 4] FIG. 2 is a top view of an above-furnace crane according to an embodiment of the present invention installed on the furnace roof of a coke oven. [Figure 5] 1 shows a temporary fixing device to a rail in an embodiment of the present invention. [Figure 6] A conventional hydraulic excavator installed on the roof of a coke oven. DETAILED DESCRIPTION OF THE INVENTION

[0014] In this application, the direction in which coke is pushed out of a coke oven is referred to as the oven length direction (FD), and the horizontal direction perpendicular to the oven length direction (FD) is referred to as the oven battery direction (SD). In the drawings, the oven length direction (FD) is indicated by a double-headed arrow marked with FD, and the oven battery direction (SD) is indicated by a double-headed arrow marked with SD.

[0015] Figure 1 shows a side view of an overhead crane 1 according to an embodiment of the present invention, installed above the furnace ceiling OC of a coke oven. Figure 1 shows the furnace crane 1 installed above the furnace ceiling OC lifting a precast block PB from above the ground GR using a pusher side PS. The precast block PB is a material used to construct a coke oven. The upper surface of the substructure SB of the coke oven is a corbel CB, and the upper side of the corbel CB is the superstructure SU.

[0016] In the embodiment shown in Figures 1 to 5, the combustion chamber CBC is reloaded in a reloading area TR, which is a part of the coke oven. In Figure 1, the area of ​​the upper structure SU is the reloading area TR, and the combustion chamber CBC has been removed. At the back of the reloading area TR, the combustion chamber CBC that is not reloaded and a cross section of the furnace ceiling OC installed above the combustion chamber CBC are visible. In the furnace ceiling OC in Figure 1, the side of the furnace ceiling OC is visible with the wall of the reloading area TR and the furnace ceiling OC on the front side removed, and the coal charging inlet CI shown in Figure 6 is provided inside the furnace ceiling OC. Figure 1 is a side view cut along a plane perpendicular to the furnace battery direction SD of the coke oven.

[0017] In the transfer area TR shown in Figure 1, the combustion chamber CBC is under construction, and multiple layers of precast blocks PB are stacked on top of the corbels CB. The precast blocks PB are stacked so as to extend in the furnace length direction FD.

[0018] The precast blocks PB are eventually stacked up to the bottom of the furnace ceiling OC, and the stacked precast blocks PB form one row of combustion chambers CBC. Figure 2 shows a perspective view of the re-stacking area TR where three rows of combustion chambers CBC have been reconstructed. The gaps between adjacent combustion chambers CBC form the carbonization chambers CC. Each combustion chamber CBC also has a space inside that serves as a flue. The furnace ceiling OC is formed above the combustion chambers CBC. The furnace ceiling OC shown in Figure 2 is in its state before casters are installed on top.

[0019] As shown in Figure 1, an overhead crane 1 is installed above the coke oven ceiling OC. A rail R is provided above the coke oven ceiling OC. The rail R has a structure in which a rail body RM is fixed on a rail support RB, and crosses above the transfer area TR. The wheels 112 of the overhead crane 1 are placed on the rail R. Above the furnace ceiling OC, a dry main pipe DM is installed on the pusher side PS of the coke oven, and a dust collection pipe DC is installed on the coke side CS.

[0020] The furnace crane 1 includes a lower base 11, an upper swivel frame 12, a truss-structured jib 13, wires 141 and 142, a winch 15, and a hook 16. The base 11 includes a frame 111 made of steel frames assembled into a framework, four wheels 112 provided below the frame 111, and a pedestal 113 provided on the frame 111. The base 11 can be moved on a rail R using the wheels 112. For this movement, the base 11 may be self-propelled on the rail R using power such as a motor. Alternatively, the base 11 on the rail R may be moved manually by a person pushing it. The swivel frame 12 rotates horizontally around a vertical axis relative to the pedestal 113. A horizontal axis is provided on the swivel frame 12, and the jib 13 can rotate vertically with the horizontal axis as a fulcrum.

[0021] The winch 15 installed on the revolving frame 12 shown in Figure 1 can wind up wires 141 and 142. The wire 141 is connected to the jib tip 131, which is the tip of the jib 13, and by winding it up, the jib tip 131 is lifted, making it possible to change the angle of elevation of the jib 13. The wire 142 is connected from the winch 15 via the jib tip 131 to the hook 16, and by operating the winch 15, the length of the wire 142 hanging from the jib 13 can be changed, thereby moving the hook 16 up and down.

[0022] In FIG. 1, the furnace crane 1 lifts a precast block PB from the pusher side PS of a coke oven via a wire W attached to a hook 16 and a gripping device G attached to the wire W. The furnace crane 1 can raise and lower the hook 16, the wire W connected to the hook 16, the gripping device G, and the precast block PB by changing the length of the wire 142 using a winch 15. The furnace crane 1 can also rotate the position of the jib tip 131 and move it horizontally by horizontally rotating the swivel frame 12 relative to the base 11. Furthermore, the position of the jib tip 131 can also be moved horizontally by changing the angle of the jib 13. Changing the angle of the jib 13 to stand upright moves the jib tip 131 horizontally toward the swivel frame 12. Therefore, by adjusting the angle of the jib 13, the horizontal distance from the swivel frame 12 to the suspended precast block PB can be adjusted.

[0023] The furnace crane 1 lifts the precast block PB higher than the dry main pipe DM as shown in Figure 1, and then rotates the swivel frame 12. It also adjusts the angle of the jib 13. This allows the furnace crane 1 to move the precast block PB over the dry main pipe DM and transport it above the transfer area TR. The winch 15 then loosens the wire 142 to lower the precast block PB and place it on top of the other precast blocks PB and corbels CB. The precast block PB, which has been grasped and lifted by the grasping device G shown in Figure 1, will then be placed on top of the other precast blocks PB by the furnace crane 1.

[0024] Figure 3 shows a top view of an overhead crane 1 according to an embodiment of the present invention installed above the coke oven ceiling OC. Figure 3 is a top view of Figure 1. When the cross section of the dotted line shown in Figure 3 is viewed from the direction of the upward arrow, it appears as in Figure 1. In the coke oven shown in Figure 3, the furnace ceiling OC and the combustion chambers CBC below the furnace ceiling OC have been removed in the transfer area TR. In Figure 3, three rows of combustion chambers CBC in the oven battery direction SD have been removed throughout the entire furnace length direction FD in the transfer area TR, and precast blocks PB are currently being loaded. Two rails R are installed above the coke oven ceiling OC in the oven battery direction SD. In the transfer area TR, the rails R are suspended in mid-air.

[0025] In the transfer area TR in Figure 3, multiple precast blocks PB shown in Figure 1 are placed on the side closest to the furnace crane 1. Similar to Figure 1, the multiple precast blocks PB in Figure 3 also show a state in which the combustion chamber CBC is in the process of being constructed. In the transfer area TR, the side of the precast block PB facing the furnace crane 1 forms a carbonization chamber CC between it and the combustion chamber CBC that has not been transferred. The side of the precast block PB opposite the furnace crane 1 in the furnace battery direction SD is in the state before the precast block PB is placed, with the corbel CB exposed where the precast block PB is installed.

[0026] As shown in Figure 3, two rails R extend in the furnace battery direction SD. In the transfer area TR, the rail R remains above the place where the furnace ceiling OC was located, and is floating. The rail R has a narrow rail body RM fixed on a wide rail support RB. The base 11 of the furnace crane 1 is placed on the rail R. As shown in Figure 1, the frame 111 of the base 11 rests on the rail body RM of the rail R with wheels 112. Therefore, the furnace crane 1 can move on the rail R in the furnace battery direction SD.

[0027] In the base 11, a pedestal 113 is fixed to a frame 111 assembled by intersecting multiple steel beams. The pedestal 113 has a circular base 113a with legs 113b extending from all four sides, and the tips of the legs 113b are fixed to the frame 111. A rotatable rotating frame 12 is placed on the pedestal 113. A jib 13 and a winch 15 are mounted on the rotating frame 12. The winch 15 can individually reel in wires 141 and 142 extending from the jib tip 131. In FIG. 3, a precast block PB held by a gripping device G is located below the tip of the jib 13. The jib tip 131 in FIG. 3 is located above the ground surface GR on the pusher side PS of the coke oven, as shown in FIG. 1. The precast block PB held by the gripping device G is also located above the ground surface GR on the pusher side PS. The jib 13 shown in FIG. 3 is in a state where the jib tip 131 is higher than that of the jib 13 shown in FIG.

[0028] Figure 4 shows a top view of the furnace crane 1 in an embodiment of the present invention with the swivel frame 12 rotated. In the state of Figure 4, the furnace crane 1 has rotated the swivel frame 12 by about 100 degrees from the state of Figure 3, and the jib tip 131 is positioned above the transfer range TR. In the state of Figure 4, by extending the wire 142, the precast block PB hanging from the jib tip 131 can be placed on top of other precast blocks PB that have already been installed.

[0029] The furnace crane 1 controls the horizontal position of the jib tip 131 by rotating the swivel frame 12 and changing the angle of the jib 13 to move it up and down, thereby controlling the horizontal position of the precast block PB suspended from the jib tip 131 via the hook 16. Changing the angle of the jib 13 changes the horizontal distance between the swivel frame 12 and the precast block PB. In addition, by moving the position of the hook 16 suspended from the jib tip 131 up and down using the wire 142, the position of the suspended precast block PB can be moved up and down. Using these position controls, the furnace crane 1 places the precast block PB at a predetermined position in the transfer area TR to construct the combustion chamber CBC.

[0030] <Installation of furnace crane 1> When assembling the furnace crane 1 shown in Figures 1, 3, and 4 onto the rail R, the parts of the furnace crane 1 are lifted up onto the furnace ceiling OC by a crane from the pusher side PS. A crane vehicle such as a rough terrain crane can be used to lift the parts of the furnace crane 1 up onto the furnace ceiling OC.

[0031] First, the base 11, which includes a frame 111, wheels 112, and a pedestal 113, is assembled on the ground GR. Then, a crane vehicle (not shown) lifts the base 11 onto the furnace ceiling OC and places it on the rail R. At this stage, it is preferable to temporarily fix the base 11 to the rail R. Then, the crane vehicle lifts the swivel frame 12 and places it on the pedestal 113. In this embodiment, a winch 15 is fixed to the swivel frame 12, and the swivel frame 12 is lifted and installed together with the winch 15. Then, the crane vehicle lifts the jib 13 and assembles the swivel frame 12, completing the furnace crane 1. Since the base 11 is made of a framework or the like, it is relatively lightweight and can be lifted by a crane vehicle. To ensure the stability of the furnace crane 1 during operation, a weight can be placed on the installed base 11 as needed. When removing the furnace crane 1, it can be disassembled in the reverse order of installation, and then lowered from above the furnace ceiling OC by a crane vehicle.

[0032] The jib 13 of the furnace crane 1 is not a heavy box-shaped structure but a lightweight truss structure. Therefore, even though the jib 13 is long enough that the jib tip 131 reaches the ground level (GR) outside the coke oven when lowered, it is still heavy enough to be lifted above the coke oven. By winding the wire 142 with the winch 15, then rotating the swivel frame 12, or winding the wire 141 and raising the jib 13, materials placed on the ground level (GR) can be lifted above the furnace ceiling (OC) through the dry main piping (DM). The furnace crane 1 does not have a structure equivalent to the crawler 511 in the conventional hydraulic excavator 5 shown in FIG. 6 . The base 113 of the furnace crane 1 is fixed to the frame 111, so the base 113 and other components will not fall off the frame 111. In the furnace crane 1, the swivel frame 12, on which the base of the jib 13 is installed, does not move in the furnace length direction (FD).

[0033] Tower cranes used for constructing buildings and the like have jibs with a truss structure. Tower cranes are designed to be assembled and disassembled at high altitudes, and their parts are lightweight, assuming they will be lifted by vehicle cranes or the like. Therefore, tower crane parts can be used for the swivel frame 12, truss-structured jib 13, and winch 15 of the furnace crane 1 shown above. Furthermore, since these parts are already available, the furnace crane 1 can be realized at low cost by reusing a tower crane with a truss-structured jib. Note that some parts, such as the swivel frame 12, may be existing parts for tower cranes. Furthermore, some parts for tower cranes of existing tower cranes can be modified and used for the furnace crane 1.

[0034] In the embodiment, when assembling the furnace crane 1 or when moving the precast block PB by the furnace crane 1, it is preferable to temporarily fix the base 11 to the rail R. FIG. 5 shows a temporary fixing device 2 for temporarily fixing to the rail R. The temporary fixing device 2 includes a rail hanging clamp 21, a wire 22, a length adjustment screw 23, and a pressure sensor 24. Wiring L is led out from the pressure sensor 24. One temporary fixing device 2 is provided near each of the four corners of the frame 111.

[0035] In this embodiment, as shown in Fig. 5, a length adjustment screw 23 of the temporary fixing device 2 is passed through a hole provided in the frame 111. The length adjustment screw 23 has a flange 231 at its upper part, and a pressure sensor 24 is sandwiched between the length adjustment screw 23 and the frame 111. The lower part of the length adjustment screw 23 is connected to a wire 22, which is connected to the upper part of the rail hanging clamp 21. When the length adjustment screw 23 is tightened and the wire 22 is lifted, the rail main body RM is sandwiched between the lower part of the rail hanging clamp 21.

[0036] The rail body RM is fixed to the rail support RB. By tightening the length adjustment screws 23 of the temporary fixing device 2, the base 11 of the furnace crane 1 is temporarily fixed to the rail R at the four corners of the frame 111. The pressure applied to the temporary fixing device 2 is measured by a pressure sensor 24, and the pressure state is reported from an output device (not shown) via wiring L. As a result, when the furnace crane 1 is temporarily fixed to the rail R, the length adjustment screws 23 can be tightened so that the pressure value measured by the pressure sensor 24 becomes appropriate. Furthermore, when a load is applied to the jib tip 131 and a force that tends to tilt the base 11 is generated, the pressure values ​​of the pressure sensors 24 installed at four locations on the frame 111 become high. When the furnace crane 1 is operated, if the pressure sensor 24 measures a pressure value above a set value, the output device can be configured to issue an emergency alarm to notify the user.

[0037] In the embodiment, a pressure sensor 24 is provided as shown in FIG. 5, but the pressure sensor 24 may be omitted. In the example shown in FIG. 5, the base 11 is temporarily fixed to the rail R by a temporary fixing device 2. However, it is sufficient to temporarily fix the base 11 so that it does not move temporarily, and the base 11 may be temporarily fixed to the rail R or the furnace ceiling OC by another device. Furthermore, if the base 11 is stable, the base 11 does not need to be temporarily fixed. In the embodiment, wheels 112 are provided on the base 11, and the wheels 112 are installed on the rail R. However, if it is not necessary to move the overhead crane in the furnace battery direction SD, the base 11 may be installed and fixed on the rail R or the like without using the wheels 112. Furthermore, the base 11 may be provided with a moving device other than the wheels 112 so that the overhead crane can move along the rail R.

[0038] In the above embodiment, an example was shown in which the precast blocks PB were placed in the transfer area TR, but the furnace crane 1 can also be used for other purposes. For example, materials other than the precast blocks PB for the combustion chamber CBC, as well as necessary equipment, can be carried into the transfer area TR, and these can be carried out of the transfer area TR. The furnace crane 1 can also be used when manufacturing a new coke oven.

[0039] In addition, the specific configuration is not limited to the embodiments, and the present invention includes design changes within the scope of the gist of the present invention. Furthermore, the above-mentioned embodiments can be combined by utilizing each other's technologies as long as there are no particular contradictions or problems in the purpose, configuration, etc. [Explanation of symbols]

[0040] FD furnace length direction SD Furnace Batteries Direction GR ground OC furnace ceiling CI coal loading port R rail RM rail body RB rail support PS Pusher Side CS Cokeside SU superstructure CC carbonization chamber CBC combustion chamber CB Corbel SB substructure PB Precast Block W Wire G gripping device TR Transshipment Range DC dust collection piping DM Dry Main Piping L wiring 1 Furnace crane 11. Base 111 frames 112 Wheels 113 Pedestal 113a units 113b Legs 12 Swivel frame 13 Jib 131 Jib tip 141 Wire 142 Wire 15 Winch 16 Hook 2 Temporary fixing device 21 Rail hanging clamp 22 wire 23 Length adjustment screw 231 flange 24 Pressure Sensor 5. Hydraulic excavators 51 Undercarriage 511 Crawler 52 Upper rotating body 53 Boom 54 Arm 541 Tip mounting hole 55 Arm cylinder 56 Cabin 57 Counterweight 6 Mobile cart 61 wheels

Claims

1. An oven crane installed above a coke oven, a base to be placed on the rails of the coke oven; a pivoting frame rotatably mounted on the base; a jib having a truss structure attached to the revolving frame; a winch for changing the length of the wire suspended from the jib; A furnace crane characterized by comprising:

2. 2. The furnace crane according to claim 1, wherein the base has wheels that can move on the rails.

3. 3. The furnace crane according to claim 2, wherein the base is provided with a temporary fixing device for temporarily fixing the base to the rail.

4. 4. The furnace crane according to claim 1, wherein the swivel frame is for a tower crane.

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