JP6603160B2 - Descaling nozzle and descaling apparatus provided with the same - Google Patents

Description

  The present invention relates to a descaling nozzle for removing scale generated on the surface of a hot-rolled material such as a hot-rolled steel strip or a thick steel plate, and a descaling provided with the same. Relates to the device.

  In the hot rolling material rolling line, the hot rolling material is charged into a heating furnace in an oxidizing atmosphere, and is usually hot rolled in a temperature range of 1100 to 1300 ° C. for several hours. During hot rolling, a primary scale is generated on the surface of the hot rolled material in the heating furnace, and a secondary scale is generated after extraction from the heating furnace. When the hot rolled material is rolled without removing such scale, the scale bites into the surface of the hot rolled material, which is the product, and remains as scale wrinkles. Scale wrinkles significantly deteriorate the surface properties of the hot-rolled material and have a significant effect on product quality because they become the starting point for cracks during bending.

Therefore, conventionally, descaling is used to remove the scale generated on the surface of the hot-rolled material by removing high-pressure water from the descaling nozzle onto the surface of the hot-rolled material and removing the scale. Simply called “Desuke”). Here, in the conventional descaling technique, in order to improve descaling efficiency, the nozzle structure is optimized, and condition control such as the injection pressure of high pressure water, the injection distance, and the injection angle is performed.
For example, Patent Document 1 discloses a descaling technique in which a descaling distance from a descaling nozzle to a steel plate is set to 150 mm or less and high pressure water is discharged from the nozzle at a discharge pressure of 40 MPa or more. For example, in the technique described in Patent Document 2, a proposal for optimizing the internal structure of the descaling nozzle has been made.

  However, in the technique described in Patent Document 1, high-pressure water having a discharge pressure of 40 MPa or more must be sprayed from a descaling distance of 150 mm or less from the steel sheet surface, so that there are restrictions on fluctuations in the surface of the hot-rolled material, equipment interaction, etc. Therefore, there are cases in which it is difficult to put into practical use, and there are problems that the equipment cost and the power cost for introducing the high-pressure pump become expensive. Further, in the technique described in Patent Document 2, a proposal for optimizing the internal structure of the descaling nozzle has been made. However, the optimization of the internal structure of the single nozzle for high-pressure water injection improves descaling efficiency. However, there is a problem that there is a limit on the nozzle structure.

  For such problems, for example, in Patent Documents 3 to 4, a nozzle for gas injection is attached to a nozzle for high-pressure water injection, and the nozzle for gas injection is used from the nozzle for high-pressure water injection. Technology that suppresses the deceleration of droplets by injecting gas so as to cover the main water flow along the main water flow, and improves descaling efficiency compared to the single nozzle for high pressure water injection (hereinafter referred to as “air assist technology”) Is also proposed). If the air assist technology is employed, the scale removal capability can be improved by simply adding a gas injection nozzle having a relatively simple structure.

  Here, in Patent Document 3, although the air assist technique is described based on a simple schematic diagram or the like, a specific nozzle structure for application to a rolling line is not specified. Therefore, there is still a lot of room for study when implementing a descaling nozzle with a nozzle for gas injection on an existing descaling apparatus.

On the other hand, Patent Document 4 discloses a nozzle structure including a main spray unit that ejects a main water stream and an auxiliary spray unit that ejects a coated air stream. In this document, as the nozzle structure, an independent arrangement type (FIGS. 1 to 3 of the publication) and an integrated type (FIG. 9, paragraph 0066) of the publication are exemplified.
That is, in the independent arrangement type, the main spray unit and the auxiliary spray unit are arranged in separate and independent headers, respectively, and the integrated type is provided with a nozzle case extending to the vicinity of the rectifier at the rear of the main spray unit. The nozzle case makes the main spray unit and the auxiliary spray unit an integral structure.

Japanese Patent No. 3924390 JP 2009-101411 A JP-A-10-323710 JP 2012-183497 A

  However, the independent arrangement type nozzle structure requires an auxiliary header for the auxiliary spray unit to be further installed around the main header for the main spray unit. For this reason, the layout is extremely difficult due to the dimensions around the descaling device, and if the auxiliary header is retrofitted around the main header, the descaling device needs to be significantly modified. . Further, if the nozzle structure is an independent arrangement type, it is difficult to inject the airflow covering the main water flow from the vicinity of the main water flow, which is not preferable in obtaining the desired air assist effect.

On the other hand, the integrated nozzle structure is suitable for obtaining the desired air assist effect because the air flow covering the main water flow can be injected from the vicinity of the main water flow. However, the descaling device usually includes a header and an adapter attached to the header side, and a base end portion including a rectifier of the main water jet nozzle and the vicinity thereof is inserted into the adapter, and a fixing nut is attached to the adapter. The main water jet nozzle is fixed at a predetermined position of the header by screwing.
Therefore, in the integrated nozzle structure disclosed in Patent Document 4, since the nozzle case extends to the vicinity of the rectifier at the rear of the main spray unit, the main / auxiliary spray unit including the nozzle case is conventionally used. The high pressure water injection nozzle cannot be attached as it is to the header that has been attached alone. Therefore, there is still a problem that it is necessary to modify the existing header. In addition, this document does not specify any specific structure of the nozzle case for mounting on the header, and it is not yet considered when implementing a descaling nozzle having an integrated nozzle structure on existing equipment. There is room for.

  Therefore, the present invention has been made paying attention to such problems, and in the descaling technology with air assist, the descaling nozzle having an integrated nozzle structure is implemented on the existing equipment. Therefore, an object of the present invention is to provide a descaling nozzle excellent in maintainability and a descaling apparatus including the descaling nozzle, which requires no modification to existing facilities.

In order to solve the above-mentioned problem, a descaling nozzle according to one aspect of the present invention is a descaling nozzle used in a descaling apparatus that removes a surface scale generated in a hot-rolled material by jetting high-pressure water, An adapter mounted on the header side of the descaling device, a substantially cylindrical main water flow injection nozzle having a main injection port for injecting a main water flow as the high-pressure water, and the main water flow injection nozzle screwed to the adapter A first fixing nut that is detachably fixed to a position in contact with the front end of the adapter, and an air flow outlet for injecting a covering air flow for covering the main water flow along the main water flow and the main water flow A substantially annular airflow injection nozzle that is fitted coaxially with the injection nozzle on the tip side thereof, and screwed onto the first fixing nut to connect the airflow injection nozzle to the first fixing nut. Characterized in that it comprises a second fixing nut for removably secured in a position where it abuts on the front end portion.

  According to the descaling nozzle according to the aspect of the present invention, the first fixing nut detachably fixes the main water jet nozzle at a position in contact with the front end portion of the adapter. The main water flow supply unit can be mounted using the same adapter structure as the conventional one. Therefore, there is no need to modify the header for existing equipment. The air flow injection nozzle can be removed separately from the main water flow injection nozzle simply by removing the screwed second fixing nut, and then the main water flow injection nozzle can be removed simply by removing the screwed first fixing nut. Can be removed from the adapter. For this reason, the air flow injection nozzle and the main water flow injection nozzle can be separately disassembled and assembled, so that maintenance is excellent. In addition, such a configuration is excellent as a configuration for covering the main water flow because airflow can be jetted from the vicinity of the radial direction with respect to the main water flow outlet in obtaining the desired air assist effect.

Here, in the descaling nozzle according to an aspect of the present invention, the main water jet nozzle and the adapter each have a first positioning portion that determines a mounting position in a circumferential direction of the main water jet nozzle, and the main water jet nozzle, It is preferable that each of the airflow injection nozzles has a second positioning portion that determines a mounting position in the circumferential direction.
Such a configuration is suitable for aligning the axis of the jet stream with the axis of the main water flow in a descaling nozzle having an integrated nozzle structure that employs descaling technology with air assist.

Further, in the descaling nozzle according to one aspect of the present invention, the main water jet nozzle is formed in an elliptical shape in which the main jet port is capable of jetting a main water flow of a flat pattern, and the air flow jet nozzle is the air flow nozzle. A plurality of injection ports are provided in parallel to the elliptical long axis of the main injection port, and the positioning shape corresponding to the second positioning portion is circumferential with respect to the elliptical long axis of the main injection port. A right specification that is mounted to be inclined at a predetermined angle in one of the directions, and a left specification that is mounted to be inclined at a predetermined angle to the other in the circumferential direction with respect to the elliptical long axis of the main injection port; It is preferable to have
With such a configuration, when mounting a plurality of descaling nozzles to the descaling device, according to the mounting position of each descaling nozzle, the right specification with the jet angle asymmetrical with respect to the central axis of the main water jet nozzle Alternatively, select the left specification as appropriate, and install the orientation of the main water jet nozzle in the direction to push the scale to be removed toward the left and right ends of the hot rolled material with respect to the center of the hot rolled material. Is preferred.

Further, in the descaling nozzle according to one aspect of the present invention, the gas flow injection nozzle is provided with a gas introduction port communicating with the air flow injection port and capable of supplying compressed air on the outer peripheral surface thereof. Is preferably formed at a position protruding from the front end face of the second fixed nut to the main injection port side when the second fixed nut is mounted.
With such a configuration, the gas introduction port and the airflow injection port can be arranged close to each other. Therefore, the airflow injection nozzle can be configured compactly with a simple structure, which is suitable as a configuration in which the airflow injection nozzle is retrofitted to the existing main water flow injection nozzle.

Further, in the descaling nozzle according to one aspect of the present invention, the adapter has a first fixing nut screwing male screw formed on the outer peripheral surface of the tip end side thereof, and the main water jet nozzle is in the middle of the axial direction of the main water jet nozzle. An annular first flange portion formed in the portion, a cylindrical portion in front of the first flange portion, and an adapter insertion portion in the rear of the first flange portion, and the rear surface of the first flange portion Is brought into contact with the front end surface of the adapter via a packing, and the first fixing nut is formed at the front portion of the outer surface of the hexagon nut portion formed at the rear portion of the outer surface of the adapter. A male screw part for adapter screwing formed on the rear part of the inner peripheral surface, and a cylindrical part of the main water jet nozzle formed on the front part of the inner peripheral surface. A first cylindrical surface to be fitted, and A first diameter large portion formed between one cylindrical surface and the female thread portion for screwing the adapter and having a diameter larger than the outer diameter of the first flange portion of the main water flow spray nozzle; And a second cylindrical portion formed at the rear portion of the outer peripheral surface thereof, and a second cylindrical surface formed on the inner peripheral surface thereof and fitted in the cylindrical portion of the main water jet nozzle. The nut has a hexagonal nut portion on its outer surface, a first fixed nut screwing female screw portion formed on the rear portion of the inner peripheral surface, and an outer periphery of the airflow injection nozzle formed on the front portion of the inner peripheral surface. A third cylindrical surface that is externally fitted to the surface, and is formed between the third cylindrical surface and the female screw portion for screwing the first fixing nut, and has a larger diameter than the outer diameter of the second flange portion of the airflow injection nozzle. It is preferable to have the second large diameter portion.
Such a configuration is suitable for simple and compact construction of a descaling nozzle that eliminates the need for modification to existing facilities and is excellent in maintainability.

In order to solve the above problem, a descaling apparatus according to an aspect of the present invention is a descaling apparatus that removes a surface scale generated in a hot-rolled material with high-pressure water sprayed from a descaling nozzle, The descaling nozzle includes a descaling nozzle according to one embodiment of the present invention.
According to the descaling apparatus according to one aspect of the present invention, since the descaling nozzle according to one aspect of the present invention is provided, the descaling nozzle having an integrated nozzle structure is already installed in the descaling technology with air assist. When implemented on equipment, it does not require modification to existing equipment and has excellent maintainability.

  As described above, according to the present invention, in the descaling technology with air assist, the implementation of the descaling nozzle with the integrated nozzle structure on the existing equipment does not require modification to the existing equipment, and maintenance is performed. A descaling nozzle excellent in performance and a descaling apparatus including the same can be provided.

It is a mimetic diagram explaining one embodiment of a descaling device provided with a descaling nozzle concerning one mode of the present invention. It is explanatory drawing of the descaling nozzle of FIG. 1, The upper half of the figure has shown the fragmentary sectional view along the axis line. FIG. 3A is a left side view of FIG. 2, in which FIG. 2A shows a state in which a right specification air flow injection nozzle is mounted, and FIG. 2B shows a state in which a left specification air flow injection nozzle is mounted. .

Hereinafter, an embodiment of the present invention will be described with reference to the drawings as appropriate. In addition, the descaling apparatus of this embodiment removes the scale which arose on the surface of the hot rolling material used as a scale removal object material in a heating furnace or during rolling with the high pressure water sprayed from a descaling nozzle.
A descaling device 10 shown in FIG. 1 is attached to equipment such as a rolling mill (not shown). In the example of FIG. 1, a plurality of transport rolls 7 are arranged on the equipment side and placed on the transport roll 7. The hot-rolled material H thus made can be transported along the transport direction F. And the descaling apparatus 10 is provided above the hot-rolled material H conveyed.
As shown in the figure, the descaling apparatus 10 has a header 2 arranged along the width direction of the hot-rolled material H (paper surface direction in the figure), and a plurality of descaling nozzles 1 are provided in the header 2. Is fixed. The plurality of descaling nozzles 1 are arranged apart from each other by a predetermined distance in the longitudinal direction of the header 2 (the width direction of the hot rolled material H).

Each descaling nozzle 1 includes an adapter 5 mounted on the header 2 side of the descaling device 10, a main water jet nozzle 20 having a main jet port 1f, and a first fixing that detachably fixes the main water jet nozzle 20 It comprises a nut 40, an airflow injection nozzle 30 having an airflow injection port 33 for injecting a covering airflow for covering the main water flow, and a second fixing nut 50 for detachably fixing the airflow injection nozzle 30. Yes.
As shown in an enlarged view in FIG. 2, the adapter 5 is a hollow, substantially cylindrical member, and a male screw 5 s for first fixing nut screwing is formed on the outer peripheral surface on the tip side of the adapter 5. The adapter 5 is attached to a predetermined position of the header 2 by welding, for example. Here, the adapter 5 can be an adapter having the same structure as the existing one. Therefore, the header 2 need not be modified.

  In the main water jet nozzle 20, the main jet port 1f is formed in an elliptical shape capable of jetting a flat pattern main water flow in which the jetted high-pressure water spreads in a fan shape. The main water jet nozzle 20 includes an annular first flange portion 21 formed at an intermediate portion in the axial direction, a cylindrical portion 22 in front of the first flange portion 21, and an adapter behind the first flange portion 21. And an insertion portion 23. A rectifier 23 s having a plurality of radially formed slits is provided at the rear of the adapter insertion portion 23. In the main water jet nozzle 20, the adapter insertion portion 23 is inserted into the adapter 5, and the rear surface 21 r of the first flange portion 21 is brought into contact with the front end surface 5 m of the adapter 5 via the packing 6.

  The main water jet nozzle 20 and the adapter 5 each have a first positioning portion 61 that determines the mounting position in the circumferential direction of each other. The first positioning portion 61 is formed on each of the main water jet nozzle 20 and the adapter 5 by, for example, a two-sided width or rectangular fitting surface with a predetermined circumferential angle. As a result, it is impossible to insert the main water jet nozzle 20 at positions where the mutual two-side widths (or rectangular fitting surfaces) face each other at the connecting portions. The main water jet nozzle 20 can be inserted only when the direction angle is a predetermined position.

  The main water jet nozzle 20 is connected to the high-pressure water supply path 3 via the header 2. The main water jet nozzle 20 has a substantially elliptical main jet port 1f for jetting high-pressure water P at the tip of the nozzle, and the shape of the jet cross section of the high-pressure water (main water flow) P jetted from the main jet port 1f. Is configured to be able to inject a main water flow of a flat pattern having a substantially elliptical shape. The main water jet nozzle 20 injects the high pressure water supplied from the high pressure water supply path 3 toward the surface of the hot-rolled material H from the main injection port 1f, The scale can be removed over the entire width of the surface of the rolled material H. The main water jet nozzle 20 is mounted on the surface of the hot rolled material H with a predetermined jet distance S and jet angle θ. In the example of this embodiment, the injection distance S is 150 mm, and the injection angle θ of the main water flow P is 50 °. Moreover, the injection pressure of the main water flow is set to 15 MPa or more. In addition, about a nozzle structure, such as an internal flow path of the main water flow injection nozzle 20, since the conventional thing can be employ | adopted suitably, the detailed description is abbreviate | omitted.

  The first fixing nut 40 includes a hexagonal nut portion 41 formed at the rear portion of the outer surface of the first fixing nut 40 and a male screw 42 for screwing the second fixing nut formed at the front portion of the outer surface of the hexagonal nut portion 41. Further, the first fixing nut 40 is externally fitted to the adapter threaded female thread portion 43 formed at the rear portion of the inner peripheral surface thereof and the cylindrical portion 22 of the main water jet nozzle 20 formed at the front portion of the inner peripheral surface thereof. The first cylindrical surface 44 is formed, and is formed between the first cylindrical surface 44 and the female thread portion 43 for screwing the adapter, and has a first diameter larger than the outer diameter of the first flange portion 21 of the main water jet nozzle 20. Part 45. Thereby, the 1st fixing nut 40 can be detachably fixed to the position where the main water jet nozzle 20 is screwed to the adapter 5 and abuts against the front end portion 5 m of the adapter 5.

The airflow jet nozzle 30 is for jetting the coating airflow A that covers the main water flow P to suppress the deceleration of the droplets, thereby improving the scale removal capability. In this example, air is used as the gas injected from the airflow injection nozzle 30. However, for example, an inert gas may be used as the other gas.
As shown in FIG. 2, the air flow injection nozzle 30 is formed in a substantially annular shape and is mounted coaxially with the main water flow injection nozzle 20. The airflow injection nozzle 30 has a second flange 35 formed on the rear portion of the outer peripheral surface 30g itself, and a second cylindrical surface 36 that is formed on the inner peripheral surface of the airflow injection nozzle 30 and fits into the cylindrical portion 22 of the main water jet nozzle 20. And have. Further, the air flow injection nozzle 30 is formed with a gas introduction port 34 communicating with the air flow injection port 33 on the outer peripheral surface thereof.
In this example, the gas inlet 34 is formed at a position protruding from the front end face 50 m of the second fixed nut 50 toward the main injection port 1 f when the second fixed nut 50 is attached. The gas inlet 34 is connected to the compressed gas supply path 4. Thereby, the airflow injection nozzle 30 injects the compressed air supplied from the compressed gas supply path 4 from the gas introduction port 34, and covers the high pressure water P along the high pressure water P injected from the main injection port 1f. A can be formed.

Furthermore, the airflow injection port 33 is arranged at a plurality of locations (six locations in this example) along the major axis of the main injection port 1f. The plurality of airflow injection ports 33 are arranged apart from each other in the major axis direction above and below the major axis of the substantially elliptical main injection port 1f so that the sprayed coated airflow A sandwiches the main water flow P from its thickness direction. Can be covered.
The air flow injection port 33 of the air flow injection nozzle 30 is provided at a position upstream of the main injection port 1f of the main water flow injection nozzle 20 by 5 to 100 mm (symbol d in the figure) in the injection direction. It is preferable that the gas is jetted toward the high-pressure water side at a covering angle of 5 ° to 35 ° with respect to 20 central axes CL. In the example of the present embodiment, the airflow injection port 33 is provided at a position upstream of the main injection port 1f by 11 mm in the injection direction, and the covering angle of 5 ° with respect to the central axis CL of the main water flow injection nozzle 20 Is provided to inject gas toward the high-pressure water side. In addition, the confluence distance with the main water flow at this time is 145 mm.

  Here, the main water jet nozzle 20 and the air jet nozzle 30 each have a second positioning portion 62 that determines the mounting position in the circumferential direction of each other. The second positioning portion 62 is formed on each of the main water jet nozzle 20 and the air jet nozzle 30 by, for example, a two-face width or a rectangular fitting face with a predetermined circumferential angle. Thereby, in the mutual connection part, it is made impossible to insert the airflow injection nozzle 30 except the position where the mutual two-surface width (or the rectangular fitting surface) is opposed to the main waterflow injection nozzle 20. Thus, the airflow injection nozzle 30 can be inserted only when the circumferential angle is a predetermined position.

  Further, as shown in FIG. 3, the airflow injection nozzle 30 of the present embodiment is prepared with a right specification 30R (see FIG. 3A) and a left specification 30L (see FIG. 3B). Specifically, the plurality of airflow injection ports 33 are provided in parallel with the elliptical long axis L1 of the main injection port 1f, and the inner peripheral surface of the airflow injection nozzle 30 corresponds to the second positioning portion 62. When the positioning shape (the above-mentioned width across flats, rectangular hole, etc.) is in the right specification 30R (see FIG. 3A), the circumferential direction with respect to the elliptical long axis L1 of the main injection port 1f In the left specification 30L (see FIG. 3 (b)), it is mounted on one side so as to incline at a predetermined angle β. It is mounted so as to be inclined at an angle β. As a result, when mounting a plurality of descaling nozzles 1 to the descaling device 10, the injection angle θ is asymmetrical with respect to the central axis CL of the main water jet nozzle 20 according to the mounting position of each descaling nozzle 1. The specification 30R or the left specification 30L is appropriately selected, and the scale of the main water jet nozzle 20 is pushed in the direction of pushing the scale to be removed toward the left and right ends of the hot rolled material H in the width direction with respect to the center of the hot rolled material H. The orientation can be installed.

  The second fixing nut 50 has a hexagonal nut portion 51 on its outer surface, a first fixing nut screwing female screw portion 52 formed on the rear portion of the inner peripheral surface thereof, and a front portion of the inner peripheral surface thereof. A third cylindrical surface 53 fitted on the outer peripheral surface 30 g of the airflow injection nozzle 30, and a second flange portion 35 of the airflow injection nozzle 30 formed between the third cylindrical surface 53 and the first fixing nut screwing female thread portion. And a second-diameter large portion 54 that is larger than the outer diameter. Thus, the second fixing nut 50 is screwed onto the first fixing nut 40 and can be detachably fixed at the position where the air flow injection nozzle 30 is in contact with the front end portion 40 m of the first fixing nut 40.

Next, the mounting (assembly) and disassembling method of the descaling nozzle 1 will be described. Here, the required number of adapters 5 are mounted in advance on the header 2 of the descaling apparatus 10 by welding or the like. Note that an adapter having the same structure as that of the existing adapter is used as the adapter 5 in this example.
When the descaling nozzle 1 is mounted, first, the packing 6 is inserted into the main water jet nozzle 20 from the adapter insertion portion 23 side to the position of the rear surface 21r of the first flange portion 21. Next, the main water jet nozzle 20 is inserted along the hollow cylinder of the adapter 5 from the adapter insertion portion 23 side. At this time, the main water jet nozzle 20 and the adapter 5 each have the first positioning portion 61 that determines the mounting position in the circumferential direction of each other, so that the main water jet is placed at a predetermined circumferential position and an axial position with respect to the adapter 5. The nozzle 20 can be inserted.

  Next, the first fixing nut 40 is inserted from the cylindrical portion 22 side at the tip of the main water jet nozzle 20, and the female screw portion 43 for adapter screwing is connected to the male screw portion 43 for screwing the first fixing nut using a wrench or the like on the hexagonal nut portion 41 on the outer surface. Tighten to 5s. Thereby, the first fixing nut 40 is screwed to the adapter 5, and the inner surface of the first large diameter portion 45 presses the first flange portion 21 of the main water jet nozzle 20 toward the rear in the axial direction. The water jet nozzle 20 can be fixed to the position in contact with the front end 5 m of the adapter 5 via the packing 6. In this example, the mounting example via the packing 6 is shown. However, if an annular O-ring or the like is used, for example, the main water jet nozzle 20 is brought into direct contact with the front end 5m of the adapter 5. It may be fixed in position.

Next, the air flow injection nozzle 30 is inserted into the cylindrical portion 22 at the tip of the main water flow injection nozzle 20. Here, as described above, the airflow injection nozzle 30 of the present embodiment is provided with the right specification 30R (see FIG. 3A) and the left specification 30L (see FIG. 3B). The air flow injection nozzles 30 of the right specification 30R and the left specification 30L are respectively selected so as to extrude the scale to be removed toward the left and right ends in the width direction with respect to the center of the intermediate rolled material H.
When the airflow injection nozzle 30 corresponding to the required position is selected, the airflow injection nozzle 30 is inserted into the cylindrical portion 22 at the tip of the main waterflow injection nozzle 20 from the rear side of the second rib portion 35. Since the second cylindrical surface 36 on the inner periphery of the airflow injection nozzle 30 and the outer peripheral surface of the cylindrical portion 22 are inlay-fitted, the mutual axial centers can be easily made coaxial with high accuracy. In addition, since the main water jet nozzle 20 and the air jet nozzle 30 each have the second positioning portion 62 that determines the mounting position in the circumferential direction, a predetermined circumferential position and an axial direction with respect to the main water jet nozzle 20. The airflow injection nozzle 30 can be mounted at the position.

  Next, the second fixing nut 50 is inserted from the cylindrical portion 22 side at the front end of the main water jet nozzle 20, and the outer hexagonal nut portion 51 is used with a spanner or the like, so that the first fixing nut screwing female thread portion 52 is connected to the second fixing nut. Tighten to the threaded male screw 42. Thereby, the second fixing nut 50 is screwed to the first fixing nut 40, and the inner surface of the second large diameter portion 54 presses the second flange portion 35 of the airflow injection nozzle 30 toward the rear in the axial direction. The airflow nozzle 30 can be fixed at a position in contact with the front end portion 40m of the first fixing nut 40. Thereby, the descaling nozzle 1 can be attached to the header 2 of the descaling apparatus 10. The disassembling procedure of the descaling nozzle 1 is the reverse of the mounting procedure described above, and a description thereof will be omitted.

  When descaling is performed by the descaling apparatus 10, the main water flow P and the covering airflow A are considered in consideration of the material and thickness of the hot rolled material H to be desketed, the injection distance that changes according to rolling, and the like. After setting the necessary descaling conditions such as the injection pressure of the hot-rolled material H, the hot-rolled material H placed on the transport roll 7 is transported along the transport direction F, and high pressure is supplied from the main water jet nozzle 20 of the descaling nozzle 1. While spraying the main water stream P as water, the coating air stream A which coat | covers the main water stream P is injected from the airflow injection nozzle 30, and the scale produced on the surface of a hot-rolled material is removed.

Next, operational effects of the descaling nozzle 1 and the descaling apparatus 10 including the same will be described.
As described above, according to the descaling nozzle 1 of the present embodiment, the first fixing nut 40 removably fixes the main water jet nozzle 20 at a position in contact with the front end portion 5m of the adapter 5. The main water flow supply part (adapter insertion part 23) on the water flow injection nozzle base end side can be mounted using the same adapter structure as the conventional one. Therefore, it is not necessary to modify the header 2 with respect to the existing equipment.

  The air flow injection nozzle 30 can be removed separately from the main water flow injection nozzle 20 simply by removing the screwed second fixing nut 50, and then the screwed first fixing nut 40 is simply removed. The main water jet nozzle 20 can be removed from the adapter 5. For this reason, the air flow injection nozzle 30 and the main water flow injection nozzle 20 can be separately disassembled and assembled, so that maintenance is excellent. Further, with such a configuration, in order to obtain the desired air assist effect, airflow can be injected from the airflow injection port 33 in the radial direction with respect to the main injection port 1f of the main waterflow, so that the main waterflow is covered. It is excellent as a construction.

  In addition, according to the descaling nozzle 1, the main water jet nozzle 20 and the adapter 5 have the first positioning portions 61 that determine the mounting positions in the circumferential direction of each other, and the main water jet nozzle 20 and the air jet nozzle. 30 has a second positioning portion 62 that determines the mounting position in the circumferential direction of each other. Therefore, in the descaling nozzle of the integrated nozzle structure that employs descaling technology with air assist, the axis of the main water flow P is This is suitable for keeping the axis of the jet airflow A along.

  In addition, according to the descaling nozzle 1, the main water jet nozzle 20 has a main jet port 1 f formed in an elliptical shape capable of jetting a main water flow of a flat pattern, and the air flow jet nozzle 30 has an air flow jet port 33. A plurality of (six locations) are provided in parallel with the elliptical major axis L1 of the main injection port 1f, and the positioning shape corresponding to the second positioning portion 62 is the elliptical major axis L1 of the main injection port 1f. On the other hand, the right specification 30R is mounted so as to be inclined at a predetermined angle β on one side in the circumferential direction, and the elliptical long axis L1 of the main injection port 1f is inclined at the predetermined angle β on the other side in the circumferential direction. Therefore, when the plurality of descaling nozzles 1 are mounted on the descaling apparatus 10, the center of the main water jet nozzle 20 depends on the mounting position of each descaling nozzle 1. The right specification 30R or the left specification 30L in which the injection angle θ is asymmetrical with respect to the axis CL is appropriately selected, and the scale to be removed from the center of the hot rolled material H is the left and right ends in the width direction of the hot rolled material H. It is suitable for mounting the direction of the main water jet nozzle 20 in the direction of pushing toward the nozzle.

  Further, according to the descaling nozzle 1, the air flow injection nozzle 30 is provided with the gas introduction port 34 that communicates with the air flow injection port 33 and can supply compressed air on the outer peripheral surface 30 g. When the second fixing nut 50 is mounted, the gas introducing port 34 and the airflow injection port are formed at positions projecting from the front end face 50m of the second fixing nut 50 toward the main injection port 1f. 33 can be arranged close to each other. Therefore, the airflow injection nozzle 30 can be configured compactly with a simple structure, and is suitable as a configuration in which the airflow injection nozzle is retrofitted to the existing main water flow injection nozzle.

The descaling nozzle and the descaling apparatus including the same according to the present invention are not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention. .
For example, in the said embodiment, although the airflow injection nozzle 30 showed the example which has the some airflow injection port 33, if not only this but a covering airflow can be injected so that the main water flow may be covered, for example, an airflow injection port 33 may be one. However, in the case of injecting a flat pattern main water flow as high-pressure water, in order to form a covered air flow that covers the main water flow, a plurality of air flow injection ports 33 are connected to the main injection ports 1f as in the example of the above embodiment. It is preferable to arrange it along the elliptical major axis L1.

  Further, for example, in the above-described embodiment, an example in which the airflow injection ports 33 are provided above and below the major axis L1 of the main injection port 1f has been described. However, the present invention is not limited thereto, and from at least one side in the thickness direction of the main water flow The air assist effect from the side where the airflow injection port 33 is arranged can also be obtained by arranging the airflow injection port 33 that injects the coating airflow for covering the main water flow. However, in order to obtain the air assist effect more suitably, it is preferable to provide the air flow injection ports 33 above and below the major axis A1 of the main injection port 1f for injecting the main water flow of a flat pattern.

DESCRIPTION OF SYMBOLS 1 Descaling nozzle 2 Header 3 High pressure water supply path 4 Compressed gas supply path 5 Adapter 6 Packing 7 Carrying roll 10 Descaling device 20 Main water flow injection nozzle 30 Air flow injection nozzle 30R Air flow injection nozzle (right specification)
30L Airflow nozzle (Left specification)
33 Airflow injection port 34 Gas introduction port 40 First fixing nut 50 Second fixing nut 61 First positioning portion 62 Second positioning portion A Coated airflow H Hot rolled material F Conveying direction P High pressure water (main water flow)
θ Injection angle S Injection distance

Claims (6)

A descaling nozzle used in a descaling device that removes surface scale generated in a hot-rolled material by jetting high-pressure water,
An adapter mounted on the header side of the descaling device, a substantially cylindrical main water flow injection nozzle having a main injection port for injecting a main water flow as the high-pressure water, and the main water flow injection nozzle screwed to the adapter A first fixing nut that is detachably fixed to a position in contact with the front end of the adapter, and an air flow outlet for injecting a covering air flow for covering the main water flow along the main water flow and the main water flow A substantially annular airflow injection nozzle that is fitted on the front end side coaxially with the injection nozzle, and a position that is screwed onto the first fixing nut and that abuts the airflow injection nozzle on the front end of the first fixing nut. A descaling nozzle comprising a second fixing nut that is detachably fixed to the nozzle.   The main water jet nozzle and the adapter each have a first positioning portion that determines a mounting position in the circumferential direction of the main water jet nozzle, and the main water jet nozzle and the airflow jet nozzle have a mounting position in the circumferential direction of each other. The descaling nozzle according to claim 1, further comprising a second positioning portion to be determined.   The main water jet nozzle is formed in an elliptical shape in which the main jet port is capable of jetting a main water flow having a flat pattern, and the airflow jet nozzle is an elliptical major axis of the main jet port. The positioning shape corresponding to the second positioning portion is mounted so as to incline at a predetermined angle in one of the circumferential directions with respect to the elliptical long axis of the main injection port. 3. The right specification and the left specification mounted so as to be inclined at a predetermined angle to the other in the circumferential direction with respect to the elliptical long axis of the main injection port. Descaling nozzle.   When the air flow injection nozzle is provided with a gas introduction port that communicates with the air flow injection port and can supply compressed air on the outer peripheral surface thereof, the gas introduction port is in a state where the second fixing nut is mounted. The descaling nozzle according to any one of claims 1 to 3, wherein the descaling nozzle is formed at a position protruding from the front end surface of the second fixed nut toward the main injection port. The adapter has a male screw for screwing a first fixing nut formed on the outer peripheral surface on the tip side of the adapter,
The main water jet nozzle includes an annular first flange portion formed in an intermediate portion in the axial direction, a cylindrical portion in front of the first flange portion, and an adapter insertion portion in the rear of the first flange portion. And the rear surface of the first flange portion is brought into contact with the front end surface of the adapter via a packing,
The first fixing nut has a hexagonal nut portion formed at a rear portion of the outer surface of the first fixing nut and a male screw for screwing a second fixing nut formed at a front portion of the outer surface of the hexagonal nut portion. A female thread portion for adapter screwing formed at the rear portion of the surface, a first cylindrical surface that is formed at the front portion of the inner peripheral surface of the surface and is fitted on the cylindrical portion of the main water jet nozzle, the first cylindrical surface, A first diameter large portion formed between the female screw portion for adapter screwing and having a larger diameter than the outer diameter of the first flange portion of the main water jet nozzle;
The airflow injection nozzle has a second rib portion formed at a rear portion of the outer peripheral surface thereof, and a second cylindrical surface formed on the inner peripheral surface of the airflow injection nozzle and fitted in the cylindrical portion of the main water jet nozzle. ,
The second fixing nut has a hexagonal nut portion on its outer surface, a first fixing nut screwing female screw portion formed on the rear portion of the inner peripheral surface, and a front portion of the inner peripheral surface of the second fixing nut. From the outer diameter of the second cylindrical portion of the airflow injection nozzle formed between the third cylindrical surface that fits around the outer peripheral surface of the injection nozzle, and the third cylindrical surface and the female screw portion for screwing the first fixing nut. The descaling nozzle according to claim 1, further comprising a large-diameter second-diameter large portion. A descaling device that removes surface scale generated in a hot-rolled material with high-pressure water sprayed from a descaling nozzle,
A descaling apparatus comprising the descaling nozzle according to claim 1 as the descaling nozzle.

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