JPH0669697U - Refractory spraying equipment for heating furnace - Google Patents

Abstract

(57) [Abstract] [Purpose] A relatively simple and compact structure allows reliable addition of water to the refractory, and it is maintenance-free, and the refractory is always mixed with an appropriate amount of water and sprayed. It is an object of the present invention to provide a device for spraying a refractory onto a heating furnace capable of performing the above. [Structure] A boom 3 is rotatably and erected on an abutment 1 standing upright on a side of a heating furnace, and a vertical pipe 7 is rotatably attached to a tip of the boom 3 via a nozzle rotation mechanism 5. A spray nozzle 8 is attached to the hanging pipe 7, and the nozzle rotating mechanism 5 connects the upper end surface of a hollow rotating shaft 17 connected to the base of the hanging pipe 7 and a hollow fixed shaft 16 connected to the refractory supply pipe 9. A ring-shaped gap 20 for adding water between the bottom surface of the
An apparatus for spraying a refractory material onto a heating furnace, which comprises:

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a refractory spraying device for a heating furnace.

The furnace walls of heating furnaces such as electric furnaces and converters are lined with refractory materials, but they are subject to melting damage and erosion due to contact with molten metal and atmosphere and reaction, and therefore damage occurs regularly or irregularly. It is essential to repair damaged furnace walls. As a repair method, a hot spraying method using a gunning refractory material (powder-granular amorphous refractory material) is often used. In this method, the gunning refractory is pumped with compressed air, water is added and it is sprayed from the nozzle to the furnace wall, and it can be repaired without lowering the temperature inside the furnace during operation or when the furnace is temporarily stopped. It is commonly used. In the past, castable refractory spraying for repair was often performed by workers with a lance-shaped nozzle inserted into the furnace in the past, but from the viewpoint of labor saving and safety, There is a tendency that a boom is attached to the side of the body so that it can be swung up and down and a spray nozzle is attached to the tip of the boom through a rotatable vertical pipe. However, in the conventional refractory spraying apparatus of this kind, the addition and mixing of water to the refractory was not appropriate. In other words, conventionally, a water addition pipe was generally guided to the spray nozzle as a side pipe and opened in the spray nozzle. For this reason, the mixture of water and the refractory was insufficient, and separation of them occurred, making it difficult to form an appropriate refractory layer at the repair target site.

As a measure against this, a ring-shaped ring rizuru for water distribution is surrounded by a fixed pipe for supplying refractory material upstream of the vertical pipe, and water is supplied here to the pipe wall of the fixed pipe for supplying refractory material. A structure is adopted in which water is supplied into the pipe from a large number of holes provided and mixed with the refractory that passes through the pipe. This structure has the advantage that the refractory and water are less likely to separate than the former, but the structure is complicated and large because a jacket must be provided separately from the rotating mechanism of the vertical pipe, which leads to an increase in cost and weight. Furthermore, due to the heat received from the furnace body, refractory materials tend to adhere to the water ejection holes, and the refractory materials solidify before the next repair and block the holes. There were many problems such as not being able to secure a sufficient amount of added water, and there was a problem in that in order to avoid this, the complicated work of disassembling and cleaning the water adding part was required.

The present invention was devised to solve the above-mentioned problems, and its purpose is to provide a relatively simple and compact structure to the refractories without clogging. An object of the present invention is to provide a refractory spraying device for a heating furnace, which can spray an appropriate amount of water by smoothly mixing it.

[0005]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention is one in which a vertical pipe is rotatably attached to a supporting means through a nozzle rotation mechanism, and a spray nozzle is attached to the vertical pipe, wherein the nozzle rotation mechanism is There is a ring-shaped gap for water addition between the upper end surface of the hollow rotary shaft connected to the base of the pipe and the lower end surface of the hollow fixed shaft connected to the refractory supply pipe. . In the present invention, the heating furnace is a concept including a ladle and the like.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings. 1 to 4 show an embodiment of a refractory spraying apparatus for a heating furnace according to the present invention. A is a furnace body of an electric furnace, 1 is a pedestal which is erected on a base floor at a predetermined distance from the furnace body A, and the pedestal 1 is equipped with a swivel base 2 which is horizontally rotatable. A base of a boom 3 is pivotally supported on the swivel base 2, and the boom 3 can be raised and lowered by a tilt cylinder 4 mounted on the swivel base 2. Reference numeral 5 denotes a nozzle rotating mechanism, a casing 50 is connected to a free end of the boom 3 via a pivot 51, and the casing 50 extends in parallel with the boom 3 and a base end thereof is pivotally attached to a swivel base 2. It is connected to the free end of a rod (or arm) 6 and is held horizontally by the parallelogram movement of the boom 3 and the rod 6 in any position.

Reference numeral 7 is a vertical pipe whose base is rotatably supported by the nozzle rotation mechanism 5, 8 is a pipe-shaped spray nozzle connected to the lower end of the vertical pipe 7, and 9 is a tip connected to the rotation mechanism 5. It is a refractory supply pipe, and a hose 10 is connected to the rear portion of the refractory supply pipe 9. The hose 10 is guided along the boom 3 and is installed separately on the base floor. Connected to 1. As is well known, the refractory spraying machine 11 has a quantitative feeder 111 such as a rotor arranged in an airtight tank 110 containing refractory, and the refractory weighed by the quantitative feeder is compressed into a hose by a compressed air blowing nozzle 112. It has a structure of pumping. Reference numeral 12 denotes a water pump, the discharge side of which is connected to a water hose 13 via a control valve 120, and the water hose 13 is guided to the nozzle rotating mechanism 5 along the boom 3.

The nozzle rotating mechanism 5 is shown in FIG. 3, in which the bracket 14 is fixed to the front part of the casing 50, and the hollow head shaft 15 is fixed to the bracket 14. The refractory supply pipe 9 is composed of a bend pipe whose inner surface is lined with ceramic, and is fixed to the upper end of the hollow head shaft 15 with a flange at the tip. The hollow head shaft 15 has a stepped hole 150 at a required depth from the upper end, and a stepped hollow fixed shaft 16 is internally fitted and supported in the stepped hole 150. The hollow fixed shaft 16 comprises a tubular case 16a made of heat-resistant metal and a ceramic sleeve 16b on the inner diameter side. On the other hand, the hollow head shaft 15 is formed with a stepped hole 151 having the same diameter as that of the stepped hole 150 and a large diameter from the lower end. It is rotatably supported by. The hollow rotating shaft 17 has an outer cylinder 17a made of a heat-resistant metal and a sleeve 17b made of a ceramic material having the same inner diameter as the hollow fixed shaft 16.

The upper end 170 of the hollow rotary shaft 17 does not reach the bottom of the stepped hole 151, and a ring-shaped chamber 19 is defined between the hollow rotary shaft upper end 170, the stepped hole 151 and the outer periphery of the hollow fixed shaft. The hollow head shaft 15 is provided with a water supply hole 152 communicating with the ring-shaped chamber 19, and the water hose 13 or the conduit 13 'connected to the water hose 13 is connected to the water supply hole 152. Seal rings 27, 27 ′ are attached between the outer circumference of the cylindrical case 16 a and the outer circumference of the outer cylinder 17 a and the stepped holes 150, 151 of the hollow head shaft 15. As shown in an enlarged view in FIG. 4, a tapered surface 172 having a required angle is formed from the center of the upper end of the hollow rotary shaft 17, while the hollow fixed shaft 16 (the tubular case 16b and the hollow fixed shaft 16a) is fixed. A tapered surface 162 tapering at a corresponding angle is formed at the tip, and the tapered surfaces 172 and 162 are not in contact with each other, and a required ring-shaped gap 20 is formed, and the outer periphery of the ring-shaped gap 20 is formed. The side communicates with the ring-shaped chamber 19.

The hollow rotary shaft 17 projects from the lower end of the hollow head shaft 15, a driven sprocket 22 is fixed to the lower end via a rotary flange 21, and an adapter 23 is fixed to the rotary flange 21. The base of the drop tube 7 is fixed to the adapter 23. Needless to say, the adapter 23 may be omitted and the base of the hanging pipe 7 may be directly fixed to the rotary flange 21. A motor 24 with a reduction gear is built in the casing 50, and an endless chain 26 is stretched between a drive sprocket 25 fixed to an output shaft of the reduction gear 50 and the driven sprocket 22, whereby a hollow rotary shaft 17 and an adapter 23 are provided. The hanging pipe 7 and the spray nozzle 8 can be integrally rotated.

The sleeve 17b is adapted to be integrally rotated with the outer cylinder 17a by bonding or spline fitting. Alternatively, the sleeves 16b and 17b may be integrated with the cylindrical case 16a and the outer cylinder 17a by bonding or coating, and in some cases, the cylindrical case 16a and the outer cylinder 17a may also be made of a ceramic material. You may comprise. Also, the boom 3 may be formed into a telescopic type or the like so that it can be moved in the axial direction by a telescopic cylinder. Further, it may be a support means that does not use a boom or the like. That is, the nozzle rotation mechanism 5 may be suspended from an overhead crane or the like by a wire or the like. In the other drawings, 28 is an internal flameproof cover surrounding the hollow head shaft 15, 29 is a flameproof cover surrounding the tip region of the refractory supply pipe 9 to the intermediate region of the adapter 23, and 30 is a hose. It is a heat shield plate that protects the tip portion of 10.

[0012]

[Operation of the embodiment]

 Next, the method of use and operation of the present invention will be described. During operation of the electric furnace, the boom 3 is swung to the side that does not hinder the work as shown in FIG. When repairing the furnace body A, the swivel base 1 is operated to move the boom 3 above the furnace body A as shown by the solid line in FIG. 2 and the phantom line in FIG. 3, and then the tilt cylinder 4 is operated to lower the boom 3. The vertical pipe 7 is inserted into the furnace, and in parallel with that, the refractory spraying machine 11 is driven to pressurize the powdered granular refractory by compressed air, and the water pump 12 is driven to pump water. The refractory is pressure-fed from the hose 10 to the refractory supply pipe 9, and passes through the hollow fixed shaft 16 and the hollow rotating shaft 17 in a dispersed manner. On the other hand, water flows from the water hose 13 into the ring-shaped chamber 19 through the water supply port 152, and is jetted from the ring-shaped gap 20 between the hollow fixed shaft 16 and the hollow rotary shaft 17 into the passage from the entire circumference. It is added to refractories passing through here. Then, they are mixed while passing through the vertical pipe 7 and sprayed into the furnace from a spray nozzle 8.

At the time of the spraying, the swivel base 2 and the tilt cylinder 4 are appropriately combined and actuated, and at the same time, the motor 24 with a reduction gear is driven, whereby the drive sprocket 25, the driven sprocket 22 and the chain 26 are interposed. The rotary flange 21 rotates clockwise or counterclockwise. Therefore, the hollow rotary shaft 17 rotates via the bearing 18, and the vertical pipe 7 and the spray nozzle 8 also rotate at an arbitrary rotation angle. As a result, the refractory mixed with water is efficiently sprayed on the circumference of the furnace body. At this time, the hollow fixed shaft 16 is in a fixed state, and the hollow rotary shaft 17 rotates while facing the hollow fixed shaft 16, so that water passing through the ring-shaped gap 20 (slit) is appropriately distributed in the hollow rotary shaft 17. It spatters in a dispersed state. As a result, the refractory comes into vigorous contact with the refractory, and even if the refractory passes through at a high speed, it is in a good stirring and mixing state and is ejected from the spray nozzle 8. The ring-shaped gap 20 has a gradient in the downstream direction, and since the hollow rotary shaft 17 that constitutes one side wall of the ring-shaped gap 20 is rotating, refractory entry is prevented and repairs should be performed by any chance. Even if the refractory remaining after spraying adheres to the ring-shaped gap 20 when it is finished, the refractory adheres to the outlet of the ring-shaped gap 20 due to the rotation of the hollow rotary shaft 17 during the next repair. Since it is forcibly peeled off and scraped off, it can be maintenance-free. Further, since water is continuously supplied to the ring-shaped chamber 19, the hollow fixed shaft 16, the hollow rotating shaft 17, and the bearing 18 are directly or indirectly water-cooled, and thermal deformation due to high temperature from the furnace body occurs. It is also possible to prevent the occurrence of heat distortion. The ring-shaped gap 20 can be arbitrarily set according to the length of the hollow fixed shaft 16, and can be easily adjusted by inserting a shim or the like in the step portion 150 'of the stepped hole 50.

[0014]

[Effect of device]

 According to the present invention described above, the hanging pipe 7 is rotatably attached to the supporting means via the nozzle rotating mechanism 5, and the spray nozzle 8 is attached to the hanging pipe 7, and the nozzle rotating mechanism 5 is Since there is a ring-shaped gap 20 for water addition between the upper end surface of the hollow rotary shaft 17 connected to the base of the hanging pipe 7 and the lower end surface of the hollow fixed shaft 16 connected to the refractory supply pipe 9, it is sufficient. In addition to ensuring a large opening area, the water can be swirled and dispersed by the rotation of the ring-shaped gap 20. As a result, it is possible to reliably and smoothly supply water at a predetermined ratio without causing clogging in the water addition region. It can be added and mixed well with the refractory material, thus forming a good quality refractory lining layer. Further, since the water addition section is not provided separately from the rotating mechanism, but is formed by making good use of the fixed-side and movable-side shafts that make up the rotating mechanism, the structure is simple and compact. It also has the excellent effect of requiring almost no maintenance for clogging.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a refractory spraying apparatus for a heating furnace according to the present invention.

FIG. 2 is a plan view of the same.

3 is a partially cutaway enlarged view of the nozzle rotating mechanism in FIG.

FIG. 4 is a partially enlarged view of FIG.

[Explanation of symbols]

 5 Nozzle Rotating Mechanism 7 Vertical Pipe 8 Spraying Nozzle 9 Refractory Supply Pipe 16 Hollow Fixed Shaft 17 Hollow Rotating Shaft 20 Ring Gap

Claims (3)

[Scope of utility model registration request] 1. A hollow pipe which is rotatably attached to a supporting means via a nozzle rotating mechanism, and a spray nozzle is attached to the vertical pipe, wherein the nozzle rotating mechanism is connected to the base of the vertical pipe. A refractory spraying device for a heating furnace, which has a ring-shaped gap for water addition between an upper end surface of a rotary shaft and a lower end surface of a hollow fixed shaft connected to a refractory supply pipe. 2. The heating furnace according to claim 1, wherein an upper end surface of the hollow rotary shaft is a hole-shaped tapered surface, and a lower end surface of the hollow fixed shaft is a tapered tapered surface corresponding to the tapered surface. Refractories spraying equipment. 3. The refractory spraying device for a heating furnace according to claim 1, wherein the hollow rotary shaft and the hollow fixed shaft have a ceramic inner layer.