JP6651813B2 - Maintenance scaffold for steel making - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a steelmaking maintenance scaffold installed between steelmaking rolls in a continuous steel plate rolling facility.

  Normally, a continuous steel plate rolling equipment is configured such that a plurality of rolling mills having a structure in which the upper and lower surfaces of a rolled steel sheet are sandwiched between a pair of work rolls and a pair of backup rolls from the outside thereof are arranged in the feed direction of the rolled steel sheet, and A large number of transport rolls are arranged at regular intervals between front and rear or between rolling mills (see Patent Document 1).

  In such a continuous steel plate rolling equipment, maintenance such as replacement of work rolls and backup rolls of a rolling mill and position adjustment are frequently performed. Similarly, the transport rolls are also periodically replaced due to wear or damage. At the time of these maintenances, a scaffold for an operator is provided, but a wooden or metal scaffold has conventionally been provided across the upper end of the roll for easy installation and removal. In particular, if a wooden scaffold having low hardness is used, there is an advantage that the roll is hardly damaged.

JP 2005-296965 A

  However, wooden or metal scaffolds are heavy and laborious to handle, and even using wooden scaffolds can damage the surface of the roll, and it is more difficult to hold the scaffold across the top of the roll. There was a problem of lack of stability.

  Therefore, in view of the above situation, the present invention seeks to solve a problem in a steelmaking maintenance scaffold installed between steelmaking rolls in a continuous steel sheet rolling facility, which is lightweight and easy to handle, and may damage the roll surface. Therefore, the present invention is to provide a steelmaking maintenance scaffold that can be easily installed between adjacent rolls and that is stable between rolls in the installed state.

The present invention is directed to a steelmaking maintenance scaffold installed between steelmaking rolls in a continuous steel plate rolling facility for solving the above-mentioned problems, comprising: a plate-shaped core material; and a polyurea formed on an outer surface of the plate-shaped core material. A resin layer, and a locking portion protruding from upper edges of both sides of the main body having a substantially rectangular cross section. The width of the main body is larger than the shortest distance D1 between the adjacent rolls. The width between the leading ends of the locking portions is set to be smaller than the center interval D2 between the adjacent rolls. Further, the upper surface of the main body portion and the upper surface of the locking portion are flush with each other. A maintenance scaffold for steelmaking is characterized in that the dimension is set so that both the lower edge and the tip of the locking portion come into contact with the surface of the roll (claim 1).

  Here, it is preferable that the plate-shaped core material is made of a foamable resin material.

Further, the sectional shape of the locking portion is preferably a tapering of a right triangle toward the outer end (claim 3).

Further, the sectional shape of the locking portion, tapered towards the outer end, is preferable (claim 4) is a shape having a circular arc surface which lower surface is in close contact with the surface of the roll.

Here, a plurality of reinforcing ribs continuous with the polyurea resin layer located on the upper surface and extending in the width direction from the main body portion to the both locking portions are provided at predetermined intervals in the axial direction of the roll, and the reinforcing ribs are provided on the plate. it is also preferably formed by providing in retracted state into a slit groove formed in Jo core (claim 5).

The steelmaking maintenance scaffold of the present invention as described above is a steelmaking maintenance scaffold installed between steelmaking rolls in a continuous steel plate rolling facility, and is formed on a plate-shaped core material and an outer surface of the plate-shaped core material. Having a polyurea resin layer, and having a locking portion protruding at both upper edges of the main body portion having a substantially rectangular cross section, the lateral width of the main body portion is larger than the shortest interval D1 between the adjacent rolls, The width between the leading ends of the locking portions on both sides is set to be smaller than the center interval D2 between the adjacent rolls, and the upper surface of the main body portion and the upper surface of the locking portion are flush with each other. Both lower edges and the leading end of the locking portion are dimensioned so that they both come into contact with the surface of the roll, so that the surface is a polyurea resin layer, so that the roll surface is not damaged, and sufficient bending is performed. With rigidity, Also it is possible to secure a sufficient strength I, further excellent wear resistance, can also be used in environments where there is water, has a durability against chemicals, thereon, between adjacent rolls The scaffold can be easily and stably installed, and since there is no protrusion on the roll, work at a high place is safe. In addition, since the upper surface is flat, there is no risk of tripping when working at heights.

  According to the second aspect, since the plate-shaped core member is made of a foamable resin material, it is lightweight and easy to handle. For example, while the weight of a conventional wooden or metal scaffold was 10 kg or more, the scaffold of the present invention could be reduced to about 3 kg.

According to claim 3, the cross-sectional shape of the locking portion are the tapering of the right triangle toward the outer end, can be installed by passing securely between the rolls definitely vertically.

According to claim 4, the cross-sectional shape of the locking portion is tapered towards the outer end, since a shape having an arc surface which lower surface is in close contact with the surface of the roll, in addition to the effect of claim 3 The locking portion can be installed in close contact with the roll surface, and the load applied to the scaffold can be dispersed and supported.

According to claim 5, continuous with the polyurea resin layer located on the upper surface, a plurality provided at predetermined intervals a reinforcing rib extending in the width direction from the main body portion to the both locking portions in the axial direction of the roll, reinforcing Since the ribs are provided in a buried state in the slit grooves formed in the plate-shaped core material , the bending rigidity is significantly increased, and sufficient strength that can be used between rolls having a long span can be secured, and as a scaffold, The thickness can be reduced as compared with the case without the reinforcing rib.

It is a perspective view of a 100-mm-thick type of the maintenance scaffold for steelmaking concerning this invention. 1 is a perspective view of a 70 mm-thick steel maintenance scaffold according to the present invention. It is a longitudinal section of a scaffold. It is a layout diagram of a bending test. It is the state which installed the scaffold of 100-mm-thick type between rolls, (a) is a longitudinal cross-sectional view, (b) is the perspective view which showed partially broken and shown. It is a state in which a scaffold having a thickness of 70 mm has been installed between rolls, (a) is a longitudinal sectional view, and (b) is a perspective view partially broken away. It is a longitudinal section showing other embodiments of a scaffold.

  Next, the present invention will be described in more detail based on embodiments shown in the accompanying drawings. 1 to 3 show a scaffold according to an embodiment of the present invention. In the drawings, reference symbol A denotes a scaffold of 100 mm thickness, B denotes a scaffold of 70 mm thickness, 1 denotes a main body, 2 denotes a locking portion, Denotes a plate-shaped core material, 4 denotes a polyurea layer, and 5 denotes a roll.

  The steelmaking maintenance scaffold of the present invention is installed between steelmaking rolls in a continuous steel plate rolling facility, for example, between adjacent transport rolls, and is used by an operator during maintenance of the continuous steel plate rolling facility. In the present embodiment, a scaffold A having a thickness of 100 mm (see FIG. 1) and a scaffold B having a thickness of 70 mm (see FIG. 2) are shown. Scaffolds A and B have the same basic configuration.

  The scaffold A has a plate-shaped core material 3 and a polyurea resin layer 4 formed on the outer surface of the plate-shaped core material 3 as shown in FIGS. 1 is a structure having locking portions 2 and 2 protruding from upper edges of both sides. Here, the plate-shaped core material 3 is made of a foamable resin material for weight reduction. The plate-shaped core member 3 is manufactured by cutting a molded or foamed resin material into a shape having the main body 1 and the locking portions 2 and 2.

  As shown in FIG. 5, the size of the scaffold A according to the present invention depends on the diameter of the rolls and the roll interval (pitch) because the scaffolds A are installed between the adjacent rolls 5 and 5. Is larger than the shortest distance D1 between the adjacent rolls 5, 5, and the width between the tips of the locking portions 2, 2 on both sides is set smaller than the center distance D2 between the adjacent rolls 5, 5. are doing. When the scaffold A is placed between the rolls 5, 5, the dimensions are set so that both lower edges of the main body 1 and the tips of the locking portions 2 come into contact with the surface of the roll 5. I have. Further, the scaffold B is the same as the scaffold A as shown in FIG. 6, and therefore, the same components are denoted by the same reference numerals and description thereof will be omitted.

  For example, when the diameter of the roll 5 is about 457 mmφ and the center distance (D2) is about 762 mm, the shortest distance D1 is about 305 mm, so that the width of the main body 1 of the scaffold A is about 357 mm, and the locking on both sides is performed. The width between the tips of the parts 2 and 2 (the total width of the scaffold) is set to about 561 mm. In the scaffold B, the width of the main body 1 is set to about 394 mm, and the width between the tips of the locking portions 2 and 2 on both sides (total width of the scaffold) is set to about 561 mm. The axial length of the scaffolds A and B is about 750 mm. The thickness of the polyurea layer 4 is about 3 mm.

  Here, as shown in FIGS. 1 and 3, the cross-sectional shape of the locking portion 2 is a right-angled triangular shape tapered toward the outer end, and the upper surface 6 of the main body 1 and the locking portion 2 The upper surface 7 is the same plane. Incidentally, the angle θ between the upper surface 7 of the locking portion 2 of the scaffold A and the inclined surface is 154 °. Although not shown, as another embodiment, the cross-sectional shape of the locking portion 2 may be tapered toward the outer end and may have a circular arc surface whose lower surface is in close contact with the surface of the roll 5.

  In order to produce the scaffolds A and B of the present invention, a polyurea resin is applied to the outer surface of the plate-shaped core material 3 with an impact-mixing spray gun to continuously cover the entire surface of the plate-shaped core material 3. Thus, the formed polyurea resin layer 4 is formed. That is, the polyurea resin layer 4 serves as a shell to provide a structure having high bending rigidity.

  Here, as shown in FIG. 7, reinforcing rolls 8,... Which are continuous with the polyurea resin layer 4 located on the upper surface and extend in the width direction from the main body 1 to both the locking portions 2, 2 are formed on the roll 5 It is also practical to increase the bending rigidity by providing a plurality at predetermined intervals in the axial direction. In order to form the reinforcing ribs 8,..., Slit grooves 9,. When the polyurea resin is spray-painted, it is only necessary to inject the polyurea resin into the slit grooves 9,.

  The polyurea resin used in the present invention is formed by a urea bond between an isocyanate and a curing agent having an amino group, and the reaction is very fast, and is characterized by being contact-cured in a few seconds. When isocyanate and a curing agent having an amino group are applied to the surface of the material 3 by a collision-mixing spray gun, a polyurea resin layer 4 having a predetermined thickness is immediately formed. Further, in the polyurea resin, the curing agent is a polyamine, and when the strain (elongation) is 2%, the tensile stress is more preferably 10 MPa or more and the breaking stress is more preferably 20 MPa or more. The polyurea resin used in the present embodiment is “RESTAR # 350” (trade name) of Starlight Industries, Ltd.

  Here, the polyurea resin layer 4 can be colored into a desired color by mixing a pigment with the raw material, and the mechanical properties can be improved by mixing an inorganic material or short fiber. In order to mix these pigments, inorganic materials, and fillers such as short fibers into the polyurea resin layer 4, the fillers may be sprayed at the same time as applying with a collision mixing spray gun, or one or both of isocyanate and a curing agent may be preliminarily applied. What is necessary is just to mix a filler. Further, the polyurea resin can be made flame-retardant by mixing a flame retardant, and the weather resistance can be further increased by applying an ultraviolet protection top coat.

  The polyurea resin used in the present invention comprises an isocyanate and a curing agent having an amino group, and particularly uses a polyamine as the curing agent. The polyurea resin is cured by a reaction in which a urea bond is formed by mixing an isocyanate and a curing agent having an amino group. This urea bond formation reaction is very fast, a few seconds, and it is difficult to perform normal molding with a molding die. Therefore, a coating film is formed on the surface of the substrate by a method of applying an isocyanate supplied from independent raw material supply hoses and a curing agent having an amino group with a collision mixing spray gun.

  The characteristics of a general polyurea resin are that it cures quickly and can form a good coating film even at a low temperature, that it has excellent chemical resistance, that it has excellent adhesion to the substrate surface, and that its elongation is 280%. As mentioned above, it can be mentioned that the adhesiveness can be maintained sufficiently following cracks and the like.

  The bending test was performed on the scaffold A described above. FIG. 4 shows a layout diagram of the bending test. That is, a load F of 100 kg is applied to the center of the upper surface in a state where both side edges of the main body 1 of the scaffolds A and B are placed on the supports 10 and 10 with the inner dimension set to 330 mm. Was measured. The amount of deflection was 0.2 mm for scaffold A and 0.4 mm for scaffold B. It can be seen that both the scaffolds have a small amount of bending even when an operator gets on the upper surface, and that they have sufficient support strength.

A, B Scaffolding 1 Main body 2 Locking section 3 Plate core 4 Polyurea resin layer 5 Roll 6 Upper surface 7 Upper surface 8 Reinforcement rib 9 Slit groove 10 Support D1 Shortest interval between rolls D2 Center interval between rolls F Load θ Angle

Claims (5)

A steelmaking maintenance scaffold installed between steelmaking rolls in a continuous steel plate rolling facility, comprising a plate-shaped core material and a polyurea resin layer formed on an outer surface of the plate-shaped core material, and having a substantially rectangular cross section. The main body has locking portions projecting from upper edges on both sides, the lateral width of the main body is larger than the shortest interval D1 between the adjacent rolls, and the width between the tips of the locking portions on both sides is adjacent. And the upper surface of the main body and the upper surface of the locking portion are flush with each other, and both lower edges of the main body and the leading end of the locking portion are set to be equal to each other. A maintenance scaffold for steelmaking , wherein dimensions are set so that both are in contact with the surface of the roll .   The maintenance scaffold for steelmaking according to claim 1, wherein the plate-shaped core material is made of a foamable resin material. Cross-sectional shape of the locking portion, steelmaking maintenance scaffolding according to claim 1 or 2, wherein the tapering of the right triangle toward the outer end. Cross-sectional shape of the locking portion is tapered towards the outer end, the shape is a claim 1 or 2 steelmaking maintenance scaffold according with arcuate surface lower surface into close contact with the surface of the roll. A plurality of reinforcing ribs that are continuous with the polyurea resin layer located on the upper surface and extend in the width direction from the main body portion to the both locking portions are provided at predetermined intervals in the axial direction of the roll, and the reinforcing ribs are formed of the plate-shaped core material The maintenance scaffold for steelmaking according to any one of claims 1 to 4, wherein the maintenance scaffold is provided in a sunk state in a slit groove formed in the groove .

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