JP2014108428A - Hydraulic cylinder of continuous casting equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce work frequency of replacement of a hydraulic cylinder by protecting the hydraulic cylinder from a large amount of slag produced from a cut part of a slab.SOLUTION: A hydraulic cylinder for vertically driving a carrier roll of continuous casting equipment comprises: a rod to which the carrier roll is rotatably connected; and a protective cover that is arranged on at least a surface seen from the width-direction center of continuous casting equipment, on the outer periphery of the rod. The conveyance-direction length of the protective cover, which is seen from the width-direction center of the continuous casting equipment, is larger in dimension than a diameter of the rod.

Description

  The present invention relates to a hydraulic cylinder of a continuous casting facility.

  In a continuous casting facility, a slab is cut into a predetermined length by gas cutting with a cutter carriage installed above the slab. The slab is transported by a plurality of transport rolls installed on the bottom side, but when cutting the slab by the cutter carriage, the transport roll located at the cutting part is lowered so as not to damage the transport roll. ing.

  However, at the time of cutting the slab, a large amount of spatter scatters from the cutting portion, and this spoil damages the rod and packing of the hydraulic cylinder that raises and lowers the transport roll, causing oil leakage from the ground portion of the hydraulic cylinder.

  Patent Documents 1 and 2 disclose techniques for preventing damage to a packing portion in a hydraulic cylinder or the like.

  Patent Document 1 discloses providing a backup ring between motion members together with a seal member that seals between motion members that perform relative motion. By providing the backup ring, the seal member can be prevented from protruding into the gap between the relative motion members due to the pressure of the sealed fluid.

  Further, Patent Document 2 discloses that a U-type heat-resistant and high-rigidity packing material is fitted in the fixed seal housing grooves at both axial ends of the hydraulic cylinder instead of the conventional O-type rubber packing. Yes. The tube cover seal for fixing can be fixed with the repulsive force bent into the U-shape by fitting the U-shaped heat-resistant and high-rigidity packing material obtained by bending the thin plate into the U-shape into the fixed seal housing groove.

JP 2008-67992 A JP 2002-250305 A

  However, since the backup ring disclosed in the cited document 1 and the U-shaped heat-resistant and high-rigidity packing material disclosed in the cited document 2 are both provided in the internal space of the hydraulic cylinder, they are still exposed to the outside. Can not protect the rod of the hydraulic cylinder. Therefore, even when Patent Documents 1 and 2 are applied to a hydraulic cylinder of a continuous casting facility, the packing provided on the sliding portion between the rod and the rod and the cylinder is damaged by a large amount of nose generated from the cutting portion. There is a problem of doing. Therefore, in the past, in order to repair or replace rods and packings, one of a plurality of installed hydraulic cylinders is stopped once every three months while the operation of the continuous casting equipment is stopped. I was working on changing cylinders.

  The present invention has been made for such a problem, and provides a hydraulic cylinder capable of protecting the hydraulic cylinder from a large amount of slack generated from a cutting portion of a slab and improving productivity. Objective.

The present invention has been made to achieve such an object, and has the following features.
[1] A hydraulic cylinder that moves up and down a transport roll provided in a range for cutting a slab,
A rod that rotatably supports the transport roll;
In the outer periphery of the rod, comprising at least a protective cover disposed on the center side in the width direction of the continuous casting equipment,
The hydraulic cylinder for continuous casting equipment, wherein the protective cover has a length in the conveying direction as viewed from the center in the width direction of the continuous casting equipment, which is larger than the diameter of the rod.
[2] The protective cover is formed such that the length in the vertical direction viewed from the center in the width direction of the continuous casting facility covers the upper end to the lower end of the rod in a state where the rod is extended. The hydraulic cylinder of the continuous casting facility as described in [1].

  According to the hydraulic cylinder of the continuous casting equipment according to the present invention, it is possible to improve the productivity by protecting the hydraulic cylinder from a large amount of slack generated from the cutting portion of the slab and reducing the frequency of replacing the hydraulic cylinder. it can.

It is a figure which shows the outline | summary of the continuous casting installation to which this invention is applied. It is a figure which shows the structure of the hydraulic cylinder at the time of the rod expansion | extension in the continuous casting equipment which concerns on embodiment of this invention, and is the figure which looked at the hydraulic cylinder from the conveyance direction front. It is a figure which shows the structure of the hydraulic cylinder at the time of the rod expansion | extension in the continuous casting equipment which concerns on embodiment of this invention, and is the figure which looked at the hydraulic cylinder from the width direction center of the continuous casting equipment. It is a figure which shows the structure of the hydraulic cylinder at the time of the rod contraction of the continuous casting equipment which concerns on embodiment of this invention, and is the figure which looked at the hydraulic cylinder from the conveyance direction front. It is a figure which shows the structure of the hydraulic cylinder at the time of the rod contraction of the continuous casting equipment which concerns on embodiment of this invention, and is the figure which looked at the hydraulic cylinder from the width direction center of the continuous casting equipment.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a diagram showing an outline of a continuous casting facility to which the present invention is applied. In this continuous casting facility, the slab 23 is transported by a plurality of transport rolls 21 and 22 from the left direction to the right direction on the paper surface.

  A cutter carriage 24 that cuts the slab into a predetermined length is provided above the slab 23. The cutter carriage 24 cuts the slab 23 while moving rails installed at both ends in the width direction of the continuous casting facility at the same speed as the conveying speed of the slab 23.

  A conveyance cylinder provided in a range where the slab 23 is cut is provided with a hydraulic cylinder 25 for raising and lowering the conveyance roll. In FIG. 1, the conveyance roll provided outside the range where the slab 23 is cut is denoted by 21, and the conveyance roll (# 1 to # 4) provided within the range where the slab 23 is cut is denoted by 22. .

  The conveyance roll 22 descends from before the timing at which the cut portion of the slab 23 passes, and rises to the original height after the cut portion of the slab 23 passes. Specifically, when the # 1 transport roll 22 descends and the cut portion of the slab 23 passes through the # 1 transport roll 22, the # 1 transport roll 22 rises and returns to the original position, and the # 2 The transport roll 22 is lowered. Thereafter, the same operation is sequentially performed on the # 3 and # 4 transport rolls 22.

  Next, the configuration of the hydraulic cylinder according to the present embodiment will be described with reference to FIGS. FIG. 2 is a diagram showing the configuration of the hydraulic cylinder when the rod is extended in the continuous casting equipment according to the embodiment of the present invention, and is a diagram of the hydraulic cylinder as viewed from the front in the conveying direction. FIG. 3 is a view showing the configuration of the hydraulic cylinder when the rod is extended in the continuous casting facility according to the embodiment of the present invention, and is a view of the hydraulic cylinder as viewed from the center in the width direction of the continuous casting facility.

  Further, FIG. 4 is a view showing the configuration of the hydraulic cylinder when the rod of the continuous casting equipment according to the embodiment of the present invention is contracted, and is a view of the hydraulic cylinder as viewed from the front in the conveying direction. FIG. 5 is a view showing the configuration of the hydraulic cylinder when the rod of the continuous casting equipment according to the embodiment of the present invention is contracted, and is a view of the hydraulic cylinder as viewed from the center in the width direction of the continuous casting equipment.

  As shown in FIG. 2, the hydraulic cylinder 25 includes a rod 12. The rod 12 expands and contracts when a piston (not shown) provided inside the cylinder is driven. A transport roll 22 is rotatably supported on the upper end of the rod 12. When the rod 12 is extended, the transport roll 22 is raised, and when the rod 12 is contracted, the transport roll 22 is lowered.

  2 is provided with a hydraulic cylinder 25 which is symmetrical with respect to the hydraulic cylinder shown in FIG. 2 at the other end of the conveyance roll 22 on the left side of the paper.

  A protective cover having a movable cover 14 and a fixed cover 13 is provided on the outer periphery of the rod 12. The upper end of the movable cover 14 is joined to the upper end of the rod 12. Thereby, the movable cover 14 moves up and down according to the raising and lowering of the rod 12.

  The movable cover 14 is formed in a box shape surrounding the rod 12 from three directions. However, the movable cover 14 is not limited to such a shape, and may be provided at least on the surface in the center in the width direction of the continuous casting facility of the hydraulic cylinder 25.

  The movable cover 14 is configured such that the length L in the transport direction as viewed from the center in the width direction of the continuous casting facility is larger than the diameter of the rod 12. Moreover, the length l in the up-down direction on the center side in the width direction of the continuous casting facility of the movable cover 14 is formed to cover the length from the upper end to the lower end of the rod 12 with the rod 12 extended.

  In addition, as a material of the movable cover 14 and the fixed cover 13, SUS excellent in corrosion resistance to water can be used.

  The movable cover 14 is open at the end surface in the width direction of the continuous casting facility for maintenance of the hydraulic cylinder 25.

  The lower end of the hydraulic cylinder 25 is rotatably supported by a trunnion bearing 15. As shown in FIG. 5, an opening 14 a is provided at the lower end of the movable cover 14 so that the movable cover 14 does not interfere with the trunnion bearing 15 when the rod 12 is lowered.

  As with the movable cover 14, the fixed cover 13 is disposed so as to surround the side surface of the piston from three directions. That is, the fixed cover 13 is composed of a surface in the center in the width direction of the continuous casting facility and a total of three surfaces before and after the conveying direction, and the surface of the end portion in the width direction of the continuous casting facility is opened so that maintenance can be performed. ing. The fixed cover 13 is configured to be higher than the opening 14a so that the opening 14a of the movable cover 14 can be closed.

  In the hydraulic cylinder 25 configured as described above, the movable cover 14 has a length L in the conveying direction as viewed from the center in the width direction of the continuous casting facility larger than the diameter of the rod 12 on the center side in the width direction of the outer periphery of the rod 12. Is provided. As a result, the spatter scattered toward the hydraulic cylinder 25 is blocked by the fixed cover 13 and the movable cover 14, and it is possible to reduce sticking and depositing on the rod 12 and the sliding portion of the rod 12 and the cylinder. . Thereby, the maintenance frequency of the hydraulic cylinder 25 can be reduced and productivity can be improved.

  Moreover, the length 12 of the up-down direction of the width direction center side of the continuous casting equipment of the movable cover 14 is formed in the length which covers from the upper end to the lower end of the rod 12 in the state which the rod 12 extended | stretched, so that the rod 12 The rod 12 and the sliding portion of the rod 12 and the cylinder can be protected by the movable cover 14 from the most extended state to the most contracted state.

  The present invention is not limited to the above embodiment, and various design changes can be made. For example, in the example of FIGS. 2 to 5, the protective cover is configured by the separated movable cover 14 and fixed cover 13. However, a telescopic cover configured by one member may be used as the protective cover. good. Moreover, you may make it cover the outer periphery of the rod 12 with the bellows-like high heat-resistant material which can be expanded-contracted further.

  Further, in the above embodiment, the movable cover 14 and the fixed cover 13 are opened on the side surface in the width direction of the continuous casting facility for maintenance, but the movable cover 14 and the fixed cover 13 are attached to the rod 12. You may comprise so that the whole outer periphery may be covered.

  Furthermore, in the above-described embodiment, the side surfaces of the movable cover 14 and the fixed cover 13 are all flat, but at least one surface of the movable cover 14 and the fixed cover 13 is convex on the inner peripheral side or the outer peripheral side. You may comprise by the curved surface which has. For example, when the surface on the center side in the width direction of the movable cover 14 is formed in a curved surface, the length in the transport direction of the movable cover 14 as viewed from the center in the width direction of the continuous casting equipment is larger than the diameter of the rod 12. What is necessary is just to comprise.

  The present invention was applied to existing equipment, and the effect of this embodiment was verified. In each of the two strands, four hydraulic cylinders at both ends of the conveyance roll shown by # 1 and # 2 in FIG. 1, that is, a total of eight hydraulic cylinders in the two strands, the protective cover according to the present embodiment. Covered by.

  As a result, before the installation of the protective cover, the hydraulic cylinder was replaced at a frequency of 4.6 cylinders / year. However, when the protective cover according to the present invention was installed, the replacement of the hydraulic cylinder was reduced to a frequency of 2.5 cylinders / year. We were able to. Accordingly, it has been found that the hydraulic cylinder is protected by the protective cover according to the present invention, and the maintenance frequency can be reduced.

12 Rod 13 Fixed cover 14 Movable cover 14a Opening 15 Trunnion bearings 21, 22 Transport roll 23 Slab 24 Cutter bogie 25 Hydraulic cylinder

Claims (2)

It is a hydraulic cylinder that moves up and down a transport roll provided in a range for cutting a slab,
A rod that rotatably supports the transport roll;
In the outer periphery of the rod, comprising at least a protective cover disposed on the center side in the width direction of the continuous casting equipment,
The hydraulic cylinder for continuous casting equipment, wherein the protective cover has a length in the conveying direction as viewed from the center in the width direction of the continuous casting equipment, which is larger than the diameter of the rod.   The protective cover is formed such that the length in the vertical direction as viewed from the center in the width direction of the continuous casting facility covers the rod from the upper end to the lower end when the rod is extended. The hydraulic cylinder of the continuous casting equipment according to claim 1.