JPS6154754B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for repairing damaged surfaces of various long refractories that are immersed in molten steel.

Taking as an example a lance pipe used for desulfurization and dephosphorization of long refractories, which is the object of the present invention, using a pig iron mixer, a ladle, etc., the lance pipe 1 is a steel pipe as shown in FIG. 2 is covered with a monolithic refractory material 3, etc., and is used for refining work in which a desulfurizing agent, etc. is injected into molten metal along with gas through the steel pipe 2, but it is used for refining work in which a desulfurizing agent, etc. is injected into molten metal with a gaseous flow. Since the coated refractory material 3 is immersed in water, the damage to the coated refractory material 3 is significant. In the figure, 50 indicates a moving (elevating) device.

Damage occurs due to slag erosion, melting damage, cracking, etc., and conventionally, repairs have been carried out manually.

However, as the cracks gradually grew larger, the number of cracks increased, and manual repair was no longer enough. Molten metal reached the core pipe (steel pipe) of the lance pipe through the cracks, causing the core pipe to melt and the lance pipe to break off. Sometimes it led to

Therefore, the life of a lance pipe is the point at which it cannot be repaired by manual repair, which is usually around 20 to 30 times, depending on the conditions of use.

In addition, this type of manual repair has poor adhesion, and since it is a partial repair without cylindrical layer thickness molding, the cylindrical connection adhesion of the repair materials cannot be expected, and the pressure bonding force during repair is poor. Due to the low temperature, a dense structure cannot be obtained, and when the slag adhering to the surface of the lance pipe melts due to the high heat during use, the repair material may slide off, and the surface of the lance pipe at the repair site may burn. Because it was vitrified and had poor adhesion to repair materials, there were problems such as the repair material that had been carefully applied overcoated falling off during use.

The present invention was developed to solve these difficulties, and it can be repaired by increasing the adhesive strength through high-pressure application, obtaining a dense structure, and applying the repair material in a cylindrical shape with a substantially uniform thickness. The gist is that a cylindrical connection adhesion can be obtained between the materials, and that quick repairs can be made using work intervals without having to remove the lance pipe at the site where the lance pipe is used as a work setup. However, the object to be repaired is surrounded by an extrusion device that extrudes the repair material from the periphery toward the center in a loose fit at the required intervals, and either the object to be repaired or the extrusion device is subjected to external force in the horizontal direction. The refractory material (repair material) is pressure-coated and repaired on the surface of the object to be repaired by holding it in a neutral state and relatively moving up and down both the object to be repaired and the extrusion device.

This will be explained below based on embodiment figures.

2 and 3 are plan and front views showing one embodiment of the present invention, in which 4 is a lance pipe 1 hanging device, and this is a wheel 7 disposed on a mounting plate 6 of a hanging rod 5. , . . . can move freely within the guide frame 8 in the horizontal direction in the drawing. Further, a frame 9 standing up on the plate 6 has wheels 10 disposed perpendicular to the wheels 7, and is configured to be movable in a guide frame 12 provided on the mounting base 11 in a direction perpendicular to the plane of the paper. Therefore, the lance pipe 1 suspended from the lance pipe 1 is movable against external forces applied from the surroundings in the horizontal direction until it reaches an equilibrium point, that is, it is suspended in a neutral state.

13 is a repair material A surrounding the object to be repaired from the circumferential direction.
The repair material extrusion equipment that extrudes and applies the
Three repair material chambers 16, . . . are arranged in a branched manner radially around a cylindrical frame-shaped portion having upper and lower openings 14, 15 through which the lance pipe 1 passes vertically. A cylinder 17, . It is configured as a piston for extruding repair material A.

The above-mentioned upper and lower openings 14 and 15 are shown as upper opening 1 in the figure.
4 is set to have a larger diameter than the lower opening 15,
When the repair material extrusion device 13 ascends, the coating layer thickness is formed by the hole diameter of the lower opening 15 having a hole diameter determining plate, and when it subsequently turns back or descends, the upper opening 1 also has a hole diameter determining plate.
Topcoat repair (the embodiment in Figure 3 corresponds to this) or coating will be performed with a hole diameter size of 4. Since the diameter of the lower aperture is smaller than the diameter of the upper aperture in this way, the flowable repair material is pushed up from below and pressure applied, and the upper aperture also provides a top coating and back surface smoothing effect, which is convenient.

As shown in the figure, the edges of the upper and lower openings 14 and 15 are curved in a shape that widens toward the end, so that a pressing effect can be exerted.

The cover 20 of the material supply port 19 formed in the top plate of the repair material chamber 16 is closed by the locking action of a locking pin 21 (FIG. 5).

In addition, regarding the air outlet 22 in the lance pipe 1, a wooden plug 2 is installed to prevent it from becoming buried during repair.
The third grade is inserted in advance. The wooden plug may be removed before use or may be burnt out at high temperature.

The repair material extrusion device 13 is supported as follows.

That is, the plates 29, 29 are attached to the upper and lower ends of the pin rod 28 installed on the upper and lower brackets 27, 27' attached to the tips of the link plates 26 which are pivotably mounted between the upper and lower brackets 25, 25' provided on the mounting base 24. ' are pivotally connected, and the plates 29,
Guide rods 30, 30 and a screw rod 31 are installed between 29'.

On the other hand, a bracket portion 33 having supports 32, 32 is provided at one corner of the repair material extrusion device 13.
It is attached to 0. 34 in the figure is a motor for driving the screw rod 31, and by this forward and reverse rotation operation, the repair material extrusion device 13 is driven by the guide rods 30, 3.
0 and goes up and down.

The above-mentioned repair material extrusion device 13 and its lifting mechanism are pivotally connected to the tip of the link plate 26, and are supported in a so-called neutral state in which they move in the horizontal direction according to the applied force. .

FIG. 4 shows a suspension device 4 having a different configuration from that shown in FIG. 3. Although the suspension device 4 in FIG. While the repair body cannot be forcibly moved in the vertical direction, this function is added.

That is, the lifting cylinder 35 for moving the object to be repaired is suspended from the mounting base 11 via the joints 36 and 37 which are shifted by 90 degrees in the horizontal direction to provide the above-mentioned neutral function, and the piston rod 38 is fixed to the hanging plate 39 on the lance pipe 1, and the plate 3
9 is a slide rod 40 for preventing the body to be repaired from rotating;
40 is erected, and guide holes 42, 42 for the slide rod 40 are bored in a flange portion 41 formed at the lower end of the cylinder 35.

If this device is used, the repair material extrusion device 13
This means that coating repairs can be performed without having to move up and down.

Other examples of suspension mechanisms that have a neutral function in the horizontal direction include chains, chains, ropes, etc.;
The one shown in the drawings is preferable because it can prevent the object to be repaired from being lifted upward when the repair material extrusion device is moved upward to coat the repair material. Further, as another example of the hanging mechanism, a simple gripping device or a fixing device may be used. That is, when the steel pipe 2 of the lance pipe or the hanging rod 5 is long, each repaired part can swing sideways like a pendulum and assume a neutral state, so conventional gripping devices and fixing devices may be used.

Incidentally, since the lance pipe is originally used for hanging, the method of the present invention can be carried out at the work site by slightly shifting the location without having to remove it each time.

In the repair material extrusion device, in addition to an example in which three repair material chambers 16, . The advantage of this case is that the work of setting the object to be repaired into the repair material extrusion device can be done from the side, which is convenient. In this regard, Figures 2 and 3
In the case of a one-piece product as shown in the figure, the extrusion device is lowered to position the opening at the lower end of the object to be repaired, and then the extrusion device is raised and inserted into the opening, but this is not the case in actual work. The method shown in Fig. 6 of this example is convenient for the above.

In this case, normal means are used for the hinge connection mechanism and fastening mechanism between the two sides.

Regarding the supply of the repair material A to the repair material chamber 16, although Figures 2 and 3 show an example of a batch type supply method, as shown in Figure 7, a system that can continuously supply the repair material A by extruding the screw is used. Good, 43 in the figure
44 represents a hopper, 44 represents a screw, and 45 represents a screw driving motor. The screw in this example also serves as a pressing mechanism for the repair material.

The repair material A may be made of various ordinary materials having appropriate viscosity and adhesiveness.

The method of the present invention carried out using the apparatus as exemplified above is as follows.

After setting the lance pipe 1 (object to be repaired) in the repair material extrusion device 13 and supplying the repair material A to the repair material chamber 16 of the repair material extrusion device 13, the repair material extrusion device or The object to be repaired is moved up and down to apply the repair coating to the entire length or damaged part.

The uniformity of the distance (application thickness) between the object to be repaired and the upper and lower openings of the repair material extrusion device during coating work is ensured even if the lance pipe 1 is irregularly bent due to use, the suspension device and the repair material Since both or one of the extrusion devices has a neutral function as described above, the extrusion is maintained by extruding the repair agent A with equal pressure.

In addition, in the case of lance pipes, etc., there is slag etc. attached to the application area, so in order to improve the adhesion with the repair material, the application area must be cut in advance.
It is effective to expose the fabric to be repaired.

In other words, if the material to be repaired is not exposed, (a) there is a slag layer intervening on the surface of the lance pipe used, and the slag may melt due to the high heat during use of the repair material, which has been applied to the surface of the used lance pipe. The repair material also slips off.

(b) The refractory surface of the lance pipe is sintered at a thickness of 2 to 5 m/m due to the high heat during use and is smooth, so it does not bond well with the repair material.

For the reasons mentioned above, not only is the adhesion of the repair material poor, but most of the repair material that has once adhered falls off early during use.

Therefore, it is extremely important to scrape away the slag on the surface of the lance pipe, as well as scrape away the sintered layer on the surface, and to expose the bare refractory material and strengthen its adhesion with the repair material.

The various effects obtained by using the device of the present invention are listed below.

(a) Even if the axis of the object to be repaired is deformed or only one side is deformed to a large extent, there is no wastage of repair material because it can be applied and repaired to an even thickness while following the deformed shape.

(b) Since the repair material is applied under high pressure, its structure becomes denser and its durability is improved.

(c) Because the adhesive is applied under high pressure, the adhesive strength with the repaired object increases, reducing peeling and increasing durability.

(d) Since it is applied with an even thickness around the object to be repaired, the effect of connecting the repair materials is improved and the durability is increased.

(e) High viscosity repair can be applied at high pressure, increasing the adhesive strength of the repair material.

(F) There is no unevenness in the structure of the repair material because it is crimped in a radial pattern.

(g) Freed from hot work.

The present invention described above can also be applied to heat-resistant coating treatment of elongated metal objects.

[Brief explanation of the drawing]

The figures show embodiments of the present invention; FIG. 1 is a longitudinal sectional view of a lance pipe, FIGS. 2 and 3 are plan views and front views showing one embodiment of the present invention, and FIG. 4 is a suspended FIG. 5 is a front view of the main parts of the repair material extrusion device, FIG. 6 is a plan view of the repair material extrusion device when it is unfolded, and FIG. 7 is a longitudinal sectional view of the repair material chamber. A simple explanation of the symbols, 1...Lance pipe, 3...
...Coated refractory, 4... Hanging device, A... Repair material,
13... Repair material extrusion device.

Claims (1)

[Scope of Claims] 1. A device that circumferentially surrounds a long object to be repaired and extrudes and applies a repair material onto the surface of the object from the circumferential direction, the device comprising: A plurality of cylindrical frame-shaped repair material chambers are arranged in a branched manner, each having a vertically extending upper and lower aperture section that stores the repair material around the aperture section, and one end side of the repair material chamber is arranged in a branched manner. 1. An elongated refractory surface coating repair device comprising an extrusion device communicating with a hole and having a drive section at the other end for extruding a repair material toward the center. 2. Coating on the surface of a long refractory material as set forth in claim 1, characterized in that the object to be repaired and/or the repair device are supported so as to be movable in the horizontal direction and can be raised and lowered. Repair equipment.