JP2017029937A - Manufacturing apparatus for resin-coated reinforcement - Google Patents

Manufacturing apparatus for resin-coated reinforcement Download PDF

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JP2017029937A
JP2017029937A JP2015153424A JP2015153424A JP2017029937A JP 2017029937 A JP2017029937 A JP 2017029937A JP 2015153424 A JP2015153424 A JP 2015153424A JP 2015153424 A JP2015153424 A JP 2015153424A JP 2017029937 A JP2017029937 A JP 2017029937A
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blank
temperature
powder coating
burner
coating
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日出雄 川崎
Hideo Kawasaki
日出雄 川崎
斎 佐藤
Hitoshi Sato
斎 佐藤
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KAWANETSU CO Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing apparatus for resin-coated reinforcement which can rapidly heat a blank and reduce device cost.SOLUTION: A reinforcing-bar blank 1 is driven by delivery in the direction of a center axis while being rotated around the center axis by a V-shaped roller 3. The blank 1 is heated from a room temperature to about 50°C by a burner heater 4, coarsened by a blast coarsening device 5, and heated to a temperature of 200 to 300°C by a high-frequency heater 6. Thereafter, this high-temperature blank 1 is sprayed with a powder coating by a powder coater 7. The powder coating melts under the holding heat of the blank 1 to cause a molten coating to adhere to the surface of the blank 1, so that the blank 1 to which the molten coating adheres is air-cooled and further water-cooled by a water cooler 8 down to a room temperature. This process enables a reinforcing bar 1a where a coating film is firmly formed to be obtained.SELECTED DRAWING: Figure 1

Description

本発明は、熱可塑性樹脂塗膜等の防食性被膜等が形成された樹脂塗装鉄筋の製造装置に関する。   The present invention relates to an apparatus for manufacturing a resin-coated reinforcing bar on which an anticorrosive coating such as a thermoplastic resin coating is formed.

従来の被膜付き鉄筋棒の製造装置とて、特許文献１に開示されたものがある。この装置においては、鉄筋棒の素材は、高周波加熱コイルにより加熱された後、静電流動浸漬装置の流動層内を通過することにより樹脂被膜が形成され、その後、ホッパーから無機質粒子を素材の樹脂被膜上に落下させ、冷却することにより、表面に樹脂被膜が形成され、この樹脂被膜の表面に無機質粒子が付着した鉄筋棒が製造される。   A conventional apparatus for manufacturing a coated steel rod is disclosed in Patent Document 1. In this apparatus, the material of the reinforcing bar is heated by a high-frequency heating coil, and then passes through the fluidized bed of the electrostatic fluidized immersion apparatus to form a resin film. Thereafter, the inorganic particles are transferred from the hopper to the resin material. By dropping on the coating and cooling, a resin coating is formed on the surface, and a reinforcing bar with inorganic particles adhered to the surface of the resin coating is produced.

また、特許文献２に開示された樹脂被覆金属線状体の製造方法においては、線状体は、ショットブラスト粗面形成装置により粗面化され、静電流動浸漬装置により樹脂が被覆され、加熱装置により加熱され、冷却装置により冷却される。   In addition, in the method for producing a resin-coated metal linear body disclosed in Patent Document 2, the linear body is roughened by a shot blast rough surface forming apparatus, coated with a resin by an electrostatic fluidized immersion apparatus, and heated. It is heated by the device and cooled by the cooling device.

更に、特許文献３に記載された高耐久性防食鋼材の製造装置は、素材をブラスト処理し、ＰＶＢ樹脂粉体塗料を素材に付着させ、加熱し、加熱無機粗粒体を素材に吹き付け、冷却するものである。この製造装置においても、流動層を備えた静電流動浸漬措置、高周波加熱コイルを備えた高周波加熱装置、無機質粗粒体吹き付けガンと冷却室を備えた無機質粗粒体吹き付け装置が設置されている。   Furthermore, the high durability anticorrosive steel material manufacturing apparatus described in Patent Document 3 blasts the material, attaches the PVB resin powder coating to the material, heats it, sprays the heated inorganic coarse particles on the material, and cools it. To do. Also in this manufacturing apparatus, an electrostatic fluidized immersion measure equipped with a fluidized bed, a high-frequency heating apparatus equipped with a high-frequency heating coil, an inorganic coarse-grain spraying apparatus equipped with an inorganic coarse-grain spray gun and a cooling chamber are installed. .

特開２０１４−８７７２５号公報JP 2014-87725 A 特開２０１４−８４８６号公報JP 2014-8486 A 特開２０１２−１６７３６８号公報JP 2012-167368 A

しかしながら、特許文献１乃至３においては、素材又は素材表面の樹脂の加熱のために、高周波加熱炉が設置されているが、この１基の高周波加熱炉により素材等を加熱するため、生産性を上げるべく、素材の送給速度を上げると、高周波加熱炉の容量を大きくする必要がある。このため、高周波加熱炉の設置コストが上昇するという問題点がある。   However, in Patent Documents 1 to 3, a high-frequency heating furnace is installed to heat the material or the resin on the surface of the material. However, since the material is heated by this one high-frequency heating furnace, productivity is reduced. To increase the feed rate of the material, it is necessary to increase the capacity of the high-frequency heating furnace. For this reason, there exists a problem that the installation cost of a high frequency heating furnace rises.

本発明はかかる問題点に鑑みてなされたものであって、素材の加熱を迅速化することができると共に、装置コストを低減することができる樹脂塗装鉄筋の製造装置を提供することを目的とする。   This invention is made | formed in view of this problem, Comprising: It aims at providing the manufacturing apparatus of the resin coating rebar which can speed up heating of a raw material and can reduce apparatus cost. .

本発明に係る樹脂塗装鉄筋の製造装置は、鉄筋棒の素材を、その軸の周りに回転させつつ、その軸の方向に送給する送給装置と、この送給装置により送給される前記素材の移動域に設置され、前記素材をバーナ加熱するバーナ加熱装置と、バーナ加熱後の前記素材を粗面化する粗面化装置と、粗面化処理後の前記素材を高周波加熱する高周波加熱装置と、高周波加熱により昇温した前記素材に、粉体塗料を吹き付ける粉体塗装装置と、粉体塗装後の前記素材を冷却して被膜付きの鉄筋棒を得る冷却装置と、を有することを特徴とする。   The apparatus for producing a resin-coated reinforcing bar according to the present invention includes a feeding device that feeds a material of a reinforcing bar around its axis while feeding it in the direction of the axis, and the above-mentioned feeding device. A burner heating device that is installed in a moving area of the material and heats the material with a burner, a roughening device that roughens the material after burner heating, and a high-frequency heating that heats the material after the surface roughening treatment at high frequency An apparatus, a powder coating apparatus for spraying a powder coating onto the material heated by high frequency heating, and a cooling apparatus for cooling the material after powder coating to obtain a coated reinforcing bar. Features.

本発明によれば、素材の加熱を、バーナ加熱装置による予備加熱と、高周波加熱装置による加熱とに分けるので、室温から、粉体塗装に必要な所定の温度まで、高周波加熱のみで加熱した場合に比して、素材の加熱の迅速化と、高周波加熱炉の必要容量の低減による低コスト化を図ることができる。バーナ加熱は素材を高温の粉体塗装温度まで加熱することはできないが、バーナ加熱装置のバーナは低廉であり、素材の移動域に複数個のバーナを設置することにより、素材の移動速度が上昇しても、バーナの数を増加するだけで容易に所定の中間温度まで加熱することができるので、素材の移動速度の高速化により高生産性を図ることができる。また、素材の必要な加熱量は、その一部をバーナ加熱装置が負担するので、高周波加熱装置による昇温の負荷が減少し、高周波加熱装置の必要容量を低下させることができるので、その低コスト化を図ることができる。   According to the present invention, since the heating of the material is divided into preheating by the burner heating device and heating by the high frequency heating device, when heating from room temperature to a predetermined temperature required for powder coating only by high frequency heating Compared to the above, it is possible to reduce the cost by speeding up the heating of the material and reducing the required capacity of the high-frequency heating furnace. Burner heating cannot heat the material to the high temperature powder coating temperature, but the burner of the burner heating device is inexpensive and the movement speed of the material is increased by installing multiple burners in the movement area of the material. Even so, it is possible to easily heat up to a predetermined intermediate temperature simply by increasing the number of burners, so that high productivity can be achieved by increasing the moving speed of the material. In addition, since the burner heating device bears a part of the necessary amount of heating of the material, the load of temperature rise by the high frequency heating device can be reduced, and the required capacity of the high frequency heating device can be reduced. Cost can be reduced.

本発明の実施形態に係る鉄筋棒の製造装置を示すブロック図である。It is a block diagram which shows the manufacturing apparatus of the reinforcing bar which concerns on embodiment of this invention. 素材（鉄筋棒）を回転駆動しつつ送給するＶ型ローラを示す図である。It is a figure which shows the V-type roller which feeds a raw material (steel bar) while rotating. バーナ加熱装置を示す図である。It is a figure which shows a burner heating apparatus. バーナ加熱装置のバーナの他の例を示す図である。It is a figure which shows the other example of the burner of a burner heating apparatus.

以下、本発明の実施形態について、添付の図面を参照して具体的に説明する。図１は、本発明の実施形態に係る樹脂塗装鉄筋の製造装置の一連の工程を示す模式図である。３．５〜１２ｍ程度の所定の長さに切断された複数本の鉄筋棒素材１が、搬入ヤード２に載置されている。搬入ヤード２の出口の近傍には、Ｖ型ローラ３が配置されていて、素材１がその長手方向に沿って移動する直線状の経路に沿って、バーナ加熱装置４、ブラスト粗面化装置５、高周波加熱装置６、粉体塗装装置７が配置されており、これらの各装置により得られた鉄筋棒１ａは、Ｖ型ローラ９により、排出ヤード１０に送り出されるようになっている。   Hereinafter, embodiments of the present invention will be specifically described with reference to the accompanying drawings. Drawing 1 is a mimetic diagram showing a series of processes of a manufacturing device of a resin painting reinforcing bar concerning an embodiment of the present invention. A plurality of reinforcing bar materials 1 cut to a predetermined length of about 3.5 to 12 m are placed in the carry-in yard 2. In the vicinity of the exit of the carry-in yard 2, a V-shaped roller 3 is arranged, and along a straight path along which the material 1 moves along its longitudinal direction, a burner heating device 4 and a blast roughening device 5 are provided. A high-frequency heating device 6 and a powder coating device 7 are arranged, and the reinforcing bar 1a obtained by each of these devices is sent out to the discharge yard 10 by a V-shaped roller 9.

図２（ａ）はＶ型ローラ３の正面図、図２（ｂ）はその動作を示す平面図である。Ｖ型ローラ３は、その外周面が、回転軸の方向に複数個のＶ型凹部３０を有し、各Ｖ型凹部３０は、その中央部が最小径であり、この中央部から回転軸方向に離隔するにつれて、外径が大きくなっており、中央部の両側に外径が連続的に変化する傾斜周面３ａ、３ｂを有するＶ字形をなしている。そして、このＶ字形凹部３０が回転軸方向に複数個（図示例は６個）形成されており、このＶ字形凹部３０内に、鉄筋棒素材１又は鉄筋棒１ａが嵌入して支持されるようになっている。Ｖ字形ローラ３は、その回転軸が、鉄筋棒素材１の進行方向（鉄筋棒素材１の軸方向）に対して、θの角度で傾斜するように配置されている。このとき、図２（ｂ）に示すように、傾斜周面３ｂの方が傾斜周面３ａよりも素材１の進行方向の前方に位置しているので、ローラ３が反時計方向に回転すると、凹部３０の最小径部（中央部）３ｃよりも、素材１の進行方向の前方の部分では、素材１は平面視でその進行方向左側の部分が傾斜周面３ｂによる接触を受けて傾斜周面３ｂの回転により、下方に向かう摩擦力を受ける。一方，素材１の進行方向の後方の部分では、素材１は平面視でその進行方向右側の部分が傾斜周面３ａによる接触を受けて傾斜周面３ａの回転により、情報に向かう摩擦力を受ける。このため、素材１には、図２（ｂ）に示すように、ローラ３により、素材１の進行方向に向かって反時計方向の回転駆動力が付与される。これにより、素材１は、ローラ３により駆動されて、排出ヤード１０に向かって進行すると共に、その進行方向に向かって反時計方向に回転する。この素材１の回転数は、例えば、３０ｒｐｍである。なお、前述の如く、Ｖ型ローラ３は、複数個（図示例は６個）のＶ字形凹部３０を有しているので、複数本（６本）の素材１が並行して同時に搬送され、同時に、加熱，粗面化、加熱、粉体塗装及び冷却の各工程を受ける。なお、同時搬送される素材１の本数は、６本に限らないが、通常、最大７本程度である。   2A is a front view of the V-shaped roller 3, and FIG. 2B is a plan view showing the operation thereof. The outer surface of the V-shaped roller 3 has a plurality of V-shaped recesses 30 in the direction of the rotation axis, and each V-shaped recess 30 has a minimum diameter at the center, and the direction from the center toward the rotation axis. As the distance increases, the outer diameter increases, and a V-shape having inclined peripheral surfaces 3a and 3b whose outer diameter continuously changes on both sides of the central portion is formed. A plurality of the V-shaped recesses 30 (six in the illustrated example) are formed in the rotation axis direction, and the reinforcing bar material 1 or the reinforcing bar 1a is inserted into and supported by the V-shaped recesses 30. It has become. The V-shaped roller 3 is arranged such that its rotation axis is inclined at an angle θ with respect to the traveling direction of the reinforcing bar material 1 (the axial direction of the reinforcing bar material 1). At this time, as shown in FIG. 2 (b), the inclined peripheral surface 3b is positioned in front of the inclined peripheral surface 3a in the traveling direction of the material 1, so that when the roller 3 rotates counterclockwise, In the portion ahead of the material 1 in the traveling direction of the minimum diameter portion (center portion) 3c of the recess 30, the material 1 is in contact with the inclined circumferential surface 3b on the left side in the traveling direction in plan view. Due to the rotation of 3b, a downward frictional force is received. On the other hand, in the rear portion of the material 1 in the traveling direction, the material 1 receives the frictional force toward the information by the rotation of the inclined peripheral surface 3a by the contact of the inclined peripheral surface 3a on the right side in the traveling direction in plan view. . Therefore, as shown in FIG. 2B, the material 1 is given a counterclockwise rotational driving force by the roller 3 in the traveling direction of the material 1. As a result, the material 1 is driven by the roller 3 and advances toward the discharge yard 10 and rotates counterclockwise in the direction of movement. The rotation speed of the material 1 is, for example, 30 rpm. As described above, since the V-shaped roller 3 has a plurality (six in the illustrated example) of the V-shaped recesses 30, a plurality (six) of the materials 1 are simultaneously conveyed in parallel. At the same time, it undergoes heating, roughening, heating, powder coating and cooling processes. The number of materials 1 that are simultaneously conveyed is not limited to six, but is usually about seven at the maximum.

素材１は、ローラ３により、先ず、バーナ加熱装置４に供給される。このバーナ加熱装置４により、素材１は、例えば，室温から５０℃まで加熱される。図３（ａ）はバーナ加熱装置４の側面図、図３（ｂ）はバーナ加熱装置４の平面図である。鉄筋棒の素材１の移動域の一方の側方に、バーナ加熱装置４のバーナ４ａが、その高温ガスの噴出方向を素材１に向けて配置されており、素材１の移動域の他方の側方に、バーナ加熱装置４のバーナ４ｂ、４ｃが、バーナ４ａに対して素材１の移動方向の前後に等寸法で離隔し、その高温ガスの噴出方向を素材１に向けて配置されている。なお、各バーナ４ａ，４ｂ、４ｃによる高温ガスの噴射範囲は、図３（ａ）に矢印にて示すように、素材１の全体を覆うものとすることが好ましい。しかし、前述の如く、素材１は、その軸方向に移動すると共に、回転しているので、バーナ４を通過する間に、素材１の周方向の加熱領域が均一化されるので、必ずしも、高温ガスの噴射範囲が素材１の全体を覆うようなものでなくても良い。そして、素材１の移動方向の３箇所に夫々バーナ４ａ、４ｂ、４ｃが設置されているので、素材１がこのバーナ加熱装置４を通過する間に所定の加熱時間にわたり高温のガスにより加熱され、室温から、例えば５０℃の温度に昇温する。   The material 1 is first supplied to the burner heating device 4 by the roller 3. By this burner heating device 4, the material 1 is heated from room temperature to 50 ° C., for example. FIG. 3A is a side view of the burner heating device 4, and FIG. 3B is a plan view of the burner heating device 4. The burner 4a of the burner heating device 4 is arranged on one side of the moving area of the material 1 of the reinforcing bar with the hot gas jet direction directed toward the material 1, and the other side of the moving area of the material 1 On the other hand, the burners 4b and 4c of the burner heating device 4 are spaced apart from the burner 4a by the same dimension before and after the moving direction of the material 1, and the direction in which the hot gas is ejected is arranged toward the material 1. In addition, it is preferable that the injection range of the high temperature gas by each burner 4a, 4b, 4c shall cover the whole raw material 1 as shown by the arrow in Fig.3 (a). However, as described above, since the material 1 moves in the axial direction and rotates, the circumferential heating region of the material 1 is made uniform while passing through the burner 4, so that the material 1 is not necessarily at a high temperature. The gas injection range does not have to cover the entire material 1. And since the burners 4a, 4b and 4c are respectively installed at three locations in the moving direction of the material 1, the material 1 is heated by a high-temperature gas over a predetermined heating time while passing through the burner heating device 4, The temperature is raised from room temperature to a temperature of 50 ° C., for example.

素材１は、次いで、グリットブラストによる粗面化装置５に供給される。この粗面化装置５においては、素材１に対し、グリットブラストにより、その表面を粗面化する。この素材１の表面の粗面化の程度は、例えば、表面粗度Rｚで３５〜４０である。ショットブラストにより、素材１の表面のスケールを除去すると共に、素材１の表面を粗面化して、後工程の粉体塗装における塗装密着強度を向上させることができる。   The material 1 is then supplied to the roughening device 5 by grit blasting. In the roughening device 5, the surface of the material 1 is roughened by grit blasting. The degree of roughening of the surface of the material 1 is, for example, 35 to 40 in terms of surface roughness Rz. By shot blasting, the scale of the surface of the material 1 can be removed, and the surface of the material 1 can be roughened to improve the coating adhesion strength in powder coating in the subsequent process.

素材１は、次いで、高周波加熱装置６により、例えば、粉体塗料の融点よりも高温の約１８０〜２２０℃の温度に加熱される。   Next, the raw material 1 is heated by the high frequency heating device 6 to a temperature of about 180 to 220 ° C., which is higher than the melting point of the powder coating material, for example.

その後、素材１は、粉体塗装装置７に送給され、この粉体塗装装置７により、素材１の表面に粉体塗料が吹き付けられる。この粉体塗料には、顔料の他、硬化剤、添加剤、及びフィラー等が必要に応じて配合される。この素材１に吹き付けられた粉体塗料は、素材１が粉体塗料の融点よりも高温であるので、溶融し、素材１の表面に、塗料が溶融した塗膜が形成される。   Thereafter, the material 1 is fed to the powder coating device 7, and the powder coating device 7 sprays the powder coating on the surface of the material 1. In addition to the pigment, a curing agent, an additive, a filler, and the like are blended in the powder coating as necessary. The powder paint sprayed on the material 1 is melted because the material 1 has a temperature higher than the melting point of the powder paint, and a coating film in which the paint is melted is formed on the surface of the material 1.

次いで、この塗膜が形成された素材１は、粉体塗装装置７から水冷装置８まで、搬送されて、その間に焼成空冷され、水冷装置８において、更に、水冷により冷却されて、室温近傍まで冷却される。その後、この素材１の表面に塗膜が形成された鉄筋棒１ａは、Ｖ型ローラ３と同様のＶ型ローラ９により、排出ヤード１０まで送出される。   Next, the material 1 on which the coating film is formed is conveyed from the powder coating device 7 to the water cooling device 8 and is baked and air cooled in the meantime, and further cooled by water cooling in the water cooling device 8 to near the room temperature. To be cooled. Thereafter, the reinforcing bar 1 a having a coating film formed on the surface of the material 1 is sent to the discharge yard 10 by the V-type roller 9 similar to the V-type roller 3.

次に、上述のごとく構成された鉄筋棒の製造装置の動作について説明する。鉄筋棒の素材１は、Ｖ型ローラ３により、中心軸の周りに回転駆動されつつ、中心軸の方向に送出駆動される。そして、素材１は、バーナ加熱装置４により、室温から約５０℃まで加熱される。その後、素材１はブラスト粗面化装置５により粗面化され、次いで、高周波加熱装置６により、１８０〜２２０℃の温度に加熱される。そして、この高温の素材１は、高周波加熱装置６から粉体塗装装置７に移動し、粉体塗装装置７により、粉体塗料が素材１に吹き付けられる。そうすると、素材１の保持熱により、粉体塗料が溶融し、溶融塗料の膜が、素材１の表面に付着する。素材１の表面は粗面化されているので、溶融塗料は強固に素材１の表面に付着する。その後、溶融塗料が付着した素材１は、焼成空冷され、更に、水冷装置８により水冷されて、室温まで冷却される。これにより、塗膜が強固に形成された鉄筋棒１ａが得られる。   Next, the operation of the reinforcing bar manufacturing apparatus configured as described above will be described. The material 1 of the reinforcing bar is sent out in the direction of the center axis while being rotated around the center axis by the V-shaped roller 3. And the raw material 1 is heated from room temperature to about 50 degreeC with the burner heating apparatus 4. FIG. Thereafter, the material 1 is roughened by the blast roughening device 5 and then heated to a temperature of 180 to 220 ° C. by the high frequency heating device 6. Then, the high temperature material 1 moves from the high frequency heating device 6 to the powder coating device 7, and the powder coating device 7 sprays the powder coating material onto the material 1. Then, the powder paint is melted by the holding heat of the material 1, and a film of the melt paint adheres to the surface of the material 1. Since the surface of the material 1 is roughened, the molten paint adheres firmly to the surface of the material 1. Thereafter, the material 1 to which the molten paint is attached is fired and air-cooled, and further water-cooled by the water-cooling device 8 and cooled to room temperature. Thereby, the reinforcing bar 1a in which the coating film is firmly formed is obtained.

本実施形態においては、粉体塗装に必要な素材１の温度を、高周波加熱装置６による加熱だけでなく、バーナ加熱装置４による加熱によっても得る。このため、高周波加熱装置６においては、素材１を例えば５０℃から１８０〜２２０℃まで昇温させるのに必要な設備容量を持てばよく、比較的低い容量の加熱能力があれば足りる。このため、設備コストが比較的低コストである。また、本実施形態は、素材１を５０℃程度まで昇温させるために、バーナ加熱を利用するので、素材１の送給速度を上げても、バーナ４ａ、４ｂ、４ｃ・・・の数を増加させることにより、素材１の温度を所望の温度（例えば，５０℃）まで昇温させることができ、高周波加熱装置６に入るまでの段階で、素材１の温度を十分に高めることができる。よって、素材１の送給速度を上昇させた場合に、高周波加熱装置６の加熱容量は比較的小さくても、バーナ加熱＋高周波加熱の連続加熱により、素材１を粉体塗装に必要な温度に十分昇温させることができる。このため、鉄筋棒の製造のための時間を短縮することができ、生産性を向上させることができる。また、鉄筋素材の高周波加熱の前段階として、バーナ加熱装置４により鉄筋素材をバーナ加熱することにより、鉄筋素材に付着した異物（油分、ごみ、汚れ等）が焼き飛ばされ、その後工程のブラスト粗面化装置５にこれらの異物が持ち込まれることがなくなり、ブラスト粗面化装置５の耐久性を向上させることができる。   In the present embodiment, the temperature of the material 1 necessary for powder coating is obtained not only by the heating by the high-frequency heating device 6 but also by the heating by the burner heating device 4. For this reason, the high-frequency heating device 6 only needs to have an equipment capacity necessary for raising the temperature of the material 1 from, for example, 50 ° C. to 180 to 220 ° C., and a heating capacity with a relatively low capacity is sufficient. For this reason, the equipment cost is relatively low. In addition, since this embodiment uses burner heating to raise the temperature of the material 1 to about 50 ° C., the number of burners 4a, 4b, 4c,. By increasing the temperature, the temperature of the material 1 can be raised to a desired temperature (for example, 50 ° C.), and the temperature of the material 1 can be sufficiently increased until entering the high-frequency heating device 6. Therefore, when the feeding speed of the raw material 1 is increased, even if the heating capacity of the high-frequency heating device 6 is relatively small, the raw material 1 is brought to a temperature necessary for powder coating by continuous heating of burner heating + high-frequency heating. The temperature can be raised sufficiently. For this reason, the time for manufacture of a reinforcing bar can be shortened and productivity can be improved. Further, as a pre-stage of high-frequency heating of the reinforcing bar material, the burner heating device 4 burns the reinforcing bar material to burn out the foreign matters (oil, dust, dirt, etc.) adhering to the reinforcing bar material. These foreign substances are not brought into the surface roughening device 5, and the durability of the blast roughening device 5 can be improved.

また、本実施形態においては、粉体塗装装置７による粉体塗装の前に、バーナ及び高周波加熱により鉄筋素材が所定の温度に加熱されているので、粉体は初期に静電効果で素材に付着し、その後、熱溶着により、粉体は素材に強固に付着する。このような静電効果及び熱溶着による付着の相乗効果で、本実施例の場合は厚膜塗装が可能になる。即ち、粉体塗布量及び／又は塗装時間の調整により、１０００μｍ厚の塗膜の形成も可能である。これに対し、粉体塗料を素材に吹き付けた後に加熱する後加熱の場合は、粉体塗装工程においては、粉の状態で鉄筋素材に塗料を吹き付けて静電効果のみで素材に塗料を付着させることになる。この方法の場合は、塗膜厚が５０〜１００μｍ程度で静電反発を起こし、それ以上付着しなくなるので、厚い塗膜を形成することができない。   Moreover, in this embodiment, since the reinforcing bar material is heated to a predetermined temperature by the burner and the high frequency heating before the powder coating by the powder coating device 7, the powder is initially converted into the material by an electrostatic effect. After adhering, the powder adheres firmly to the material by thermal welding. With this synergistic effect of adhesion due to electrostatic effect and heat welding, thick film coating is possible in this embodiment. That is, it is possible to form a coating film having a thickness of 1000 μm by adjusting the powder coating amount and / or the coating time. On the other hand, in the case of post-heating where the powder coating is heated after spraying the material, in the powder coating process, the coating material is sprayed onto the reinforcing bar material in a powder state, and the paint is attached to the material only by electrostatic effect. It will be. In the case of this method, an electrostatic repulsion occurs when the coating thickness is about 50 to 100 μm, and no further adhesion occurs, so that a thick coating cannot be formed.

なお、素材１のバーナ加熱装置４としては、図３に示すバーナ４ａ、４ｂ、４ｃの他に、例えば、図４に示すバーナ４０も使用することができる。このバーナ４０は、素材１の周囲を取り囲むように、素材１の周面に沿って伸びるガス供給部を有し、この弧状のガス供給部から高温のガスを弧の中心に向けて吹き出すように形成されている。これにより、素材１は、その周面の全域が均一に加熱されるので、その昇温速度を上げることができる。   As the burner heating device 4 for the material 1, for example, a burner 40 shown in FIG. 4 can be used in addition to the burners 4a, 4b, and 4c shown in FIG. The burner 40 has a gas supply portion extending along the peripheral surface of the material 1 so as to surround the periphery of the material 1, and discharges high-temperature gas from the arc-shaped gas supply portion toward the center of the arc. Is formed. Thereby, since the whole area | region of the raw material 1 is heated uniformly, the temperature increase rate can be raised.

１：素材
１ａ：鉄筋棒
３，９：Ｖ型ローラ
４：バーナ加熱装置
５：ブラスト粗面化装置
６：高周波加熱装置
７：粉体塗装装置
８：水冷装置 1: Material 1a: Reinforcing bar 3, 9: V-type roller 4: Burner heating device 5: Blast roughening device 6: High-frequency heating device 7: Powder coating device 8: Water cooling device

Claims (1)

鉄筋棒の素材を、その軸の周りに回転させつつ、その軸の方向に送給する送給装置と、
この送給装置により送給される前記素材の移動域に設置され、前記素材をバーナ加熱するバーナ加熱装置と、
バーナ加熱後の前記素材を粗面化する粗面化装置と、
粗面化処理後の前記素材を高周波加熱する高周波加熱装置と、
高周波加熱により昇温した前記素材に、粉体塗料を吹き付ける粉体塗装装置と、
粉体塗装後の前記素材を冷却して被膜付きの鉄筋棒を得る冷却装置と、
を有することを特徴とする樹脂塗装鉄筋の製造装置。 A feeding device that feeds the material of the reinforcing bar around the axis in the direction of the axis, and
A burner heating device that is installed in a moving area of the material fed by the feeding device and heats the material.
A roughening device for roughening the material after heating the burner;
A high-frequency heating device for high-frequency heating the material after the roughening treatment;
A powder coating apparatus for spraying a powder coating on the material heated by high-frequency heating;
A cooling device for cooling the material after powder coating to obtain a coated reinforcing bar;
An apparatus for producing resin-coated reinforcing bars, comprising:
JP2015153424A 2015-08-03 2015-08-03 Manufacturing apparatus for resin-coated reinforcement Pending JP2017029937A (en)

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