JPH0213473Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a distribution chute replacement device for a bellless furnace top charging device.

[Conventional technology]

In a bellless furnace top charging device, which is a material charging device for a blast furnace, when installing and removing the distribution chute from the drive device, as shown in Fig. 6, the distribution chute is attached to a replacement jig b with a counterweight a. c.
Set the center of gravity of distribution chute c and replacement jig b.
The center of gravity of the blast furnace is balanced with the center of gravity of the blast furnace, and the wire rope d of an electric hoist (not shown) is used to suspend the electric hoist. The distribution chute c is taken in and taken out, and the distribution chute c is attached and detached by rotating a trunnion provided in the drive device g.

[Problem that the invention attempts to solve]

However, in the case of this method, in order to run the electric hoist within a certain range, it is necessary to ensure that there are no interferences between the wire rope d hanging the replacement jig b and the replacement jig b within its operating range. There is.

On the other hand, in a blast furnace, the installation level of the drive device g is near the charging floor of the blast furnace turret, and conventionally, the charging floor supports the load of the furnace top equipment and fixes the furnace body, so the beam is It has a large and complicated beam structure.

Therefore, in order to secure the operating space for the wire rope d and the replacement jig b, it is necessary to change the beam structure of the turret.Especially in a refurbished blast furnace, when installing a bellless furnace top, the modification cost increases and the modification period is long. There was a drawback to it.

In view of these circumstances, the present invention allows the distribution chute to be installed and removed without modifying the turret, thereby making it possible to reduce the amount of equipment and shorten the modification period.

[Means for solving problems]

In the present invention, in a bellless reactor top charging device in which the distribution chute is attached and detached by rotating a trunnion provided in the drive device, a telescopic arm is provided on a traveling carriage that can move toward the reactor core. The boom is rotatably attached, a bracket having a space above is pivotally attached to the tip of the arm, and a hydraulic cylinder is attached between the bracket and a required part of the arm, and the hydraulic cylinder is operated. The bracket is configured to be tiltable, and a circuit for absorbing slight movement when the trunnion rotates is incorporated in the piping system of the hydraulic cylinder.

[Effect]

Therefore, with the distribution chute set on the bracket, the traveling truck is driven to a predetermined position, and the distribution chute and the trunnion are aligned by tilting the bracket and extending and contracting the arm on the traveling vehicle. The distribution chute is attached and detached by rotation.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

As shown in FIG. 1, a traveling cart 3 having a plurality of wheels 2 is provided on a rail 1 provided on a blast furnace tower (not shown) so as to be able to travel toward the center of the furnace. Note that the traveling carriage 3 may be driven by electric or hydraulic drive (hydraulic motor), or a traveling mechanism may be installed on the traveling carriage 3 and configured to be self-propelled using externally supplied power. A frame 4 is fixedly installed on the traveling truck 3, and a boom 6 is attached to the frame 4 via a shaft 5.
A rotation device, for example, a hydraulic cylinder 7 is provided between the upper end of the boom 6 and a desired position of the traveling carriage 3, and by operating the hydraulic cylinder 7, the boom 6 is pivoted about the shaft 5. It is configured so that it can be rotated as follows. Further, an arm 8 is inserted into the boom 6 so as to be slidable in the longitudinal direction of the boom 6, and a hydraulic cylinder 9 is installed between the arm 8 and the boom 6 to extend and retract the arm 8. Further, at the tip of the arm 8, there is a distribution chute 10 at the top.
A bracket 11 with a space for supporting the shaft 1
A hydraulic cylinder 13 is provided between the upper position of the bracket 11 and a required position of the arm 8, and the bracket 11 can be tilted about the shaft 12 by operating the hydraulic cylinder 13. do.

In addition, 14 is a support stand provided on the bracket 11 to support the distribution chute 10, 15 is a lock pin for preventing the distribution chute 10 from falling from above the bracket 11, and 16 is a support stand provided on the bracket 11 to support the distribution chute 10.
This is a lock pin to prevent the arm 8 from falling due to a drop in hydraulic pressure when the arm 8 is in a state where the arm 8 is supported. Further, 17 indicates a counterweight that prevents the traveling truck from floating due to the load of the distribution chute 10, and 18 indicates a replacement port provided in the furnace body 19.

The distribution chute 10 is attached to and detached from a trunnion 25 provided in a drive device 24 by rotation of the trunnion 25, and as shown in FIG. The trunnion 25 has a male shape with a groove 22 corresponding to the nose 20 and a protrusion 23 corresponding to the jaw 21. is forming.

In such a configuration, when installing the distribution chute 10, move the carriage 3 outside the furnace body 19 of the blast furnace turret, lower the arm 8, and level the bracket 11 as shown in FIG. 1A. keep it in condition. Then, the distribution chute 10, which has been transported by another means, is taken into the bracket 11 from above and placed on the supports 14, 14. Here, the spacing between the supports 14, 14 is such that the center of gravity of the distribution chute 10 is located in the middle thereof. When the distribution chute 10 is mounted on the bracket 11, the lock pin 15 is used to secure the bracket 1.
1 and the distribution chute 10 are fixed.

In this state, the traveling cart 3 is run on the rail 1 toward the center of the furnace, and the replacement port 18 provided in the furnace body 19 is
Move to. Next, operate the hydraulic cylinders 7 and 13 to release the bracket 11 and distribution chute 1.
0, as shown in FIG.

Furthermore, the angles of the arm 8 and the bracket 10 are adjusted by operating the hydraulic cylinders 7 and 13 so that the bracket 11 is at the angle shown in FIG. 1C. The angle at this time is such that the nose 20 of the distribution chute 10 and the groove 22 of the trunnion 25 are aligned as shown in FIG. Further, at this time, the work will be easier if the dimensions are set so that the angle of the nose 20 and the angle of the boom 6 match.

The hydraulic cylinder 9 is then extended and the nose 20 of the distribution chute 10 is pushed into the groove 22 of the trunnion 25 until it makes contact. After that, the trunnion 25 is aligned with the axis O in FIG.
rotation in the direction causes the projections 23 of the trunnion 25 to engage the jaws 21 of the distribution chute 10.

When the distribution chute 10 performs circular movement with respect to the furnace center axis and changes the inclination angle by the drive device 24,
As shown in FIG. 2, the protrusion 2 of the trunnion 25
3 and the groove 22 support the load of the distribution chute 10, and are fixed with a lock pin (not shown).

Also, when removing the distribution chute 10, after setting the distribution chute 10 on the bracket 11, rotate the trunnion 25 in the direction of arrow Y from the state shown in Fig. 2 to the state shown in Fig. 3, and then remove it. .

By the way, as described above, when attaching and detaching the distribution chute 10 to and from the trunnion 25, the trunnion 25 is rotated about the axis O. At this time, the nose 20 of the distribution chute 10 and the trunnion 25 A relative displacement occurs between the distribution chute 10 and the groove portion 22, and a force (fine movement) that moves the distribution chute 10 is generated. If this force is not absorbed, the trunnion 2
5 may be prevented from rotating, or parts on the traveling trolley 3 side may be damaged. Therefore, in the present invention, a circuit for absorbing this force is incorporated into the piping system of the hydraulic cylinder 13.

That is, in FIG. 4, 26 is the hydraulic cylinder 1.
3, which is a manual switching valve when manually operated, and an electromagnetic type when remotely operated. The operation switching valve 26 is a three-position, four-way switching valve in order to stop the bracket 10 midway. Also, the head side of the hydraulic cylinder 13,
Piping 2 between the rod side and the operating switching valve 26
7, 28, and a flow control valve 2 is provided at the hydraulic cylinder 13 side position of the piping 27, 28.
Operated check valves 31 and 32 are provided at positions on the operation switching valve 26 side, respectively. Flow control valves 29 and 30 are hydraulic cylinders 13
The operated check valves 31 and 32 are used to adjust the operating speed of the piston rod 13a, and the operated check valves 31 and 32 prevent oil from leaking in the pipes 27 and 28 when the operation switching valve 26 is in the neutral position, so that the hydraulic cylinder 13 is This is to prevent it from moving due to external force when it is stopped. Furthermore, between the pipes 27 and 28 located between the flow control valves 29 and 30 and the operated check valves 31 and 32,
A communication pipe 35 having check valves 33 and 34 arranged opposite to each other, and a check valve 36 arranged opposite to each other.
37, and the connecting pipes 35 and 38 are connected by a connecting pipe 40 provided with a relief valve 39 at a position between each check valve, and the connecting pipe 40 and the connecting pipe 38 are connected. A conduit 41 is made to communicate with the portion. Note that 42 is a check valve provided in the conduit 41, 43 is a pump, and 44 is a tank.

In the above, as shown in FIG.
When the trunnion 25 is rotated in the direction of the arrow X while the distribution chute 10 is engaged with the distribution chute 10, the distal end of the distribution chute 10 is similarly moved in the direction of the arrow X. At this time, in FIG. 1, the bracket 11 with the distribution chute 10 mounted thereon is rotated clockwise about the shaft 12. In other words, the hydraulic cylinder 13 in FIG.
A force is generated that pulls the piston rod 13a to the right, and at this time, the pressure P _r in the hydraulic cylinder 13 on the rod side increases. This pressure P _r is the relief valve 39
When the pressure rises to the set pressure, the oil on the rod side of the hydraulic cylinder 13 flows from the pipe 28 to the connecting pipes 35, 40,
38 and further to the head side through the piping 29, and the piston rod 13a moves to the right. That is,
The hydraulic cylinder 13 slightly moves its length so that the trunnion 25 can rotate smoothly.

Furthermore, if the cross-sectional areas of the rod side and the head side of the hydraulic cylinder 13 are different, the amount of oil will be different for the amount of movement of the piston rod 13a, so the tank 44 replenishes oil to ensure smooth operation.

When removing the distribution chute 10, the trunnion 25 is turned in the direction of arrow Y in FIG.
At this time, in the hydraulic cylinder 13, the pressure P _h on the head side increases, contrary to the above. In this case, in the hydraulic circuit shown in FIG. 4, the oil on the head side flows from the pipe 29 to the connecting pipes 35, 60, 38, and further to the rod side via the pipe 28, so that the trunnion 25 can rotate smoothly. be exposed.

In the hydraulic circuit, the distribution chute 10 is attached to the bracket 11, and the bracket 11 is connected to the shaft 12.
Let P ₁ be the operating pressure of the hydraulic pump 43 required to rotate the trunnion 25, and P 2 be the pressure P _r or P _h generated in the hydraulic cylinder 13 when a load of 100% torque of the electric motor that rotates the trunnion ₂₅ is generated. In this case, it is preferable that the set pressure of the relief valve 39 be set to an intermediate value between _P1 and _P2 . By doing so, it is possible to prevent malfunction due to the relief valve 39 operating at the operating pressure of the pump 43, and also to prevent the electric motor from being overloaded.

In addition, if the set pressures of the relief valves on the rod side and the head side of the hydraulic cylinder 13 are significantly different, two relief valves 39a, 39 as shown in FIG.
b.

[Effect of idea]

As explained above, according to the present invention, (i) it is possible to provide a replacement device that allows the distribution chute to be attached and detached without major modification of the furnace top turret, thereby reducing construction costs and shortening the construction period; obtain.

(ii) The hydraulic circuit has been devised so that it can follow the movement of the trunnion for smooth operation.

It can produce excellent effects such as

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the distribution chute replacement device for a bell-less furnace top charging device of the present invention, and FIGS. 2 and 3 are explanatory diagrams showing the attachment and detachment of the trunnion and distribution chute, respectively, in different states, FIG. 4 is an explanatory diagram of a circuit for absorbing slight movement when the trunnion rotates, FIG. 5 is a partial diagram showing another example of the circuit of FIG. 4, and FIG. 6 is an explanatory diagram of a conventional example. 3 is a traveling truck, 6 is a boom, 7 is a hydraulic cylinder, 8 is an arm, 9 is a hydraulic cylinder, 10 is a distribution chute, 11 is a bracket, 13 is a hydraulic cylinder, 24 is a drive device, 25 is a trunnion, 35,
38 is a communication pipe, and 39 is a relief valve.

Claims (1)

[Scope of utility model registration request] In a bellless reactor top charging system in which the distribution chute is attached and detached by rotating a trunnion installed in the drive device, a boom equipped with a telescoping arm is rotated on a traveling cart that can move toward the reactor core. a bracket having a space above is pivotally attached to the tip of the arm;
Further, a hydraulic cylinder is installed between the bracket and a required part of the arm, so that the bracket can be tilted by the operation of the hydraulic cylinder, and the piping system of the hydraulic cylinder is further provided with a slight movement when the trunnion rotates. A distribution chute replacement device for a bellless furnace top charging device, characterized by incorporating a circuit for absorption.