JPS621468A - Method and apparatus for painting deformed bar - Google Patents
Method and apparatus for painting deformed barInfo
- Publication number
- JPS621468A JPS621468A JP14023585A JP14023585A JPS621468A JP S621468 A JPS621468 A JP S621468A JP 14023585 A JP14023585 A JP 14023585A JP 14023585 A JP14023585 A JP 14023585A JP S621468 A JPS621468 A JP S621468A
- Authority
- JP
- Japan
- Prior art keywords
- reinforcing bars
- deformed reinforcing
- painting
- feed
- induction heating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Coating Apparatus (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
- Electrostatic Spraying Apparatus (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は鉄筋コンクリートに使用されるふしまたはリブ
付き等のＲＣ用もしくはｐｃ用異形鉄筋の塗装方法およ
び塗装装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method and apparatus for coating deformed reinforcing bars for RC or PC, such as those with tabs or ribs, used in reinforced concrete.
（従来の技術）
近来海洋コンクリート構造物が多くなり、鉄筋コンクリ
ート内に包蔵して使用する鉄筋でも、塩分からの防食が
必要とされている。また特に海洋コンクリート構造物に
限らず、川砂の不足からコンクリートに海砂の一部混入
その他各種要因による塩害が生じつつある。かかる現状
から、防食のため鉄筋にエポキシ系粉体塗料を塗装した
うえで使用することが試みられつつある。〔塗装鉄筋の
設計・施工・品質基準（案）・同解説；日本道路協会刊
行、昭和５９年２月〕
鉄筋については、配筋時に曲げ等が加えられる際に塗装
がはがれず、かつ異形性を保有せしめるため可及的に薄
い均一な被膜を形成するのが好ましいが、これにはエポ
キシ系粉体塗料の各種塗装方法の中で静電塗装が通して
いるとされている。(Prior Art) In recent years, the number of marine concrete structures has increased, and even the reinforcing bars contained in reinforced concrete are required to be protected against corrosion from salt. In addition, salt damage is occurring not only in marine concrete structures but also due to lack of river sand, some sea sand mixed into concrete, and various other factors. In view of the current situation, attempts are being made to coat reinforcing bars with epoxy powder paint for corrosion protection. [Design, construction, quality standards (draft) and commentary for painted reinforcing bars; Published by Japan Road Association, February 1981] Regarding reinforcing bars, the coating should not peel off when bending etc. are applied during reinforcing, and the irregular shape should be maintained. It is preferable to form a uniform coating as thin as possible in order to maintain the properties of the coating, and among the various coating methods for epoxy powder coatings, electrostatic coating is said to be suitable for this purpose.
上記静電塗装方法を用いた異形鉄筋の塗装では、まず鉄
筋を電気炉、熱風炉等に入れ、所定時間かけて２３０〜
２５０℃にまで昇温させて予熱し、しかる後予熱された
鉄筋の表面に静電噴射ガンで粉体塗料を吹きつけるよう
にする。When painting deformed reinforcing bars using the electrostatic coating method described above, the reinforcing bars are first placed in an electric furnace, hot air oven, etc., and heated to
The temperature is raised to 250°C to preheat it, and then powder coating is sprayed onto the surface of the preheated reinforcing bars using an electrostatic spray gun.
（従来技術に存する問題点）
上記従来方法は、電気炉、熱風炉等を用いるため、全断
面加熱とならざるを得ず、従って所定温度までの予熱に
時間がかかり生産性が低く、かつ表面処理であるのに関
連の薄い内部まで表面と同一の温度まで加熱するのでエ
ネルギーの無駄が多い。(Problems with the prior art) The above conventional method uses an electric furnace, hot air oven, etc., so it has to heat the entire cross section. Therefore, it takes time to preheat to a predetermined temperature, and productivity is low. Even though it is a process, a lot of energy is wasted as it heats the thin internal parts to the same temperature as the surface.
その上、電気炉等へは一度に複数本人れて同時加熱する
が、次工程の粉体塗料吹きつけは１本ずつ施さざるを得
す、連続的なライン生産態勢をとることができない。こ
れがため粉体塗料吹きつけ時の前後関係で温度差が生じ
、膜厚に不均一が生じたりピンホールができ易く、品質
にばらつきが多い。 かかる現況から、特殊な場合を除
き、塗装異形鉄筋は未だ普及の段階に至らず、高品質の
塗装異形鉄筋を低コストで大量生産可能な方法の確立が
希求されていた。Furthermore, although multiple people are placed in an electric furnace at the same time to heat the products at the same time, the powder coating must be sprayed one by one in the next step, making it impossible to set up a continuous production line. As a result, temperature differences occur before and after the powder paint is sprayed, resulting in uneven film thickness, easy pinholes, and many variations in quality. Under these circumstances, except in special cases, painted deformed reinforcing bars have not yet reached the stage of widespread use, and there has been a desire to establish a method that can mass-produce high-quality painted deformed reinforcing bars at low cost.
（発明の目的）
本発明はふしまたはリブ付き等の異形鉄筋にエポキシ系
粉体塗料を静電塗装する場合の、高品質かつ低コストで
大量生産が可能な塗装方法および塗装装置を提供するこ
とを目的とする。(Object of the Invention) The present invention provides a coating method and coating device that enables high quality, low cost, and mass production when electrostatically coating epoxy powder coating on deformed reinforcing bars such as those with hooks or ribs. With the goal.
（第一発明の構成）
本願第一発明の構成は、
（１１前処理に付したふし付き、リブ付き等の異形鉄筋
を予熱し、その表面にエポキシ系粉体塗料を静電塗装す
る場合において、
（２）上記異形鉄筋を軸方向送りしつつ誘導加熱手段に
より所定予熱温度よりも１０〜２０℃高温に加熱のうえ
、
（３）送り速度と異形形状とから定まる表面均熱までの
所定時素後に異形鉄筋の表面へエポキシ系粉体塗料を静
電噴射するようにし、
（４）次いで可及的に少数配置した送りローラと塗料被
覆異形鉄筋表面との接触点に冷却水の細流を流すように
して（般送し、
（５）少なくとも粉体塗料硬化後に塗装鉄筋の表面を水
冷するようにした
ことを特徴とする異形鉄筋の塗装方法にある。(Configuration of the first invention) The configuration of the first invention of the present application is as follows: (11) In the case of preheating deformed reinforcing bars such as those with tabs or ribs that have been subjected to pretreatment, and electrostatically coating the surface with epoxy powder coating. , (2) While feeding the deformed reinforcing bar in the axial direction, the deformed reinforcing bar is heated to 10 to 20 degrees Celsius higher than the predetermined preheating temperature using an induction heating means, and (3) the rebar is heated for a predetermined period of time until the surface is soaked, which is determined from the feeding speed and deformed shape. After that, epoxy powder paint is electrostatically sprayed onto the surface of the deformed reinforcing bars, and (4) a trickle of cooling water is then flowed at the contact points between the feed rollers, which are arranged in as few numbers as possible, and the surface of the painted deformed reinforcing bars. (5) A method for coating deformed reinforcing bars, characterized in that the surface of the coated reinforcing bars is water-cooled at least after the powder coating has hardened.
（第二発明の構成）
而して上記第一発明を実施するための本願第二発明の構
成は、
（１）異形鉄筋を軸方向送りするローラ群、送り通路に
沿って設けられた誘導加熱コイル、複数基の静電噴射ガ
ンおよび冷却ジャケットから構成され、（２）上記誘導
加熱コイルと静電噴射ガンとの配置間隔を送り速度と異
形形状とから定まる所定間隔に設定し、
（３）上記複数基の静電噴射ガンは送り通路の周方向に
均等角度で分散配置されるとともに、送り通路斜め後方
から所定角度をもって送り通路の一点に照準を集中する
如く設定され、
（４）当該静電噴射ガンと上記冷却ジャケットとの配置
間隔は少なくとも異形鉄筋表面に付着した粉体塗料が硬
化可能な時間以上の送り時間経過距離とし、
（５）その間に配置されて上方周面に接触する異形鉄筋
を搬送可能な単数もしくは複数の送り用ローラは冷却水
ノズルを具えていて、当該冷却水ノズルが送り方向後方
側からた駆動ローラの上方周接線沿いに冷却水の細流を
噴流可能に設定されていること
を特徴とする異形鉄筋の塗装装置にある。(Configuration of the second invention) The configuration of the second invention of the present application for carrying out the first invention is as follows: (1) A group of rollers that feed the deformed reinforcing bars in the axial direction, and an induction heating provided along the feeding path. It is composed of a coil, a plurality of electrostatic spray guns, and a cooling jacket, (2) the arrangement interval between the induction heating coil and the electrostatic spray gun is set to a predetermined interval determined from the feed speed and the irregular shape, (3) The plurality of electrostatic spray guns described above are distributed at equal angles in the circumferential direction of the feed passage, and are set so as to focus their sights on one point of the feed passage at a predetermined angle from diagonally rearward of the feed passage; The interval between the electric injection gun and the cooling jacket shall be at least a feeding time elapsed distance longer than the time required for the powder coating adhered to the surface of the irregularly shaped reinforcing bars to harden; The single or plural feed rollers capable of conveying the reinforcing bars are equipped with cooling water nozzles, and the cooling water nozzles are set to be able to jet a trickle of cooling water along the upper circumferential line of the drive roller from the rear side in the feeding direction. The coating equipment for deformed reinforcing bars is characterized by:
（発明の作用）
本発明は、誘導加熱される異形鉄筋表面の、誘導加熱の
特性と鉄筋の異形性に起因する加熱直後の不均一温度を
塗料吹きつけ時に適正所定温度に均一化する作用、異形
鉄筋表面への塗料吹きつけを周方向で均一とする作用、
塗料吹きつけ後の鉄筋表面を当該塗料が硬化するまでの
間を非接触に近い状態で搬送する作用および適正時間後
に塗装鉄筋を水冷して塗装工程時間を短縮する作用を発
揮する。(Function of the Invention) The present invention has an effect of uniformizing the non-uniform temperature of the surface of the deformed reinforcing bar subjected to induction heating immediately after heating due to the characteristics of induction heating and the irregularity of the reinforcing bar to an appropriate predetermined temperature when spraying paint. The effect of uniformly spraying paint on the surface of deformed reinforcing bars in the circumferential direction,
It has the effect of transporting the surface of the reinforcing steel sprayed with paint in a nearly non-contact state until the paint hardens, and the effect of shortening the painting process time by cooling the painted reinforcing steel with water after an appropriate amount of time.
（実施例）
本発明を第１図（ａ）〜（ｄ）に示す実施例に従って以
下に詳述する。(Example) The present invention will be described in detail below according to the example shown in FIGS. 1(a) to (d).
異形鉄筋は本発明実施に際し、前処理としてショツトブ
ラストによる錆落しが施される。次いで異形鉄筋は第１
図（ａ）の塗装ラインＰＬに搬入される。When implementing the present invention, deformed reinforcing bars are subjected to rust removal by shot blasting as a pretreatment. Next, the deformed reinforcing bar is the first
It is carried into the painting line PL shown in Figure (a).
塗装ラインＰＬにおいて、１は加熱ゾーン、２は均熱ゾ
ーン、３は複数基の静電噴射ガン、４は塗料硬化ゾーン
、５は冷却ジャケットである。また加熱ゾーン１の図示
左側には異形鉄筋Ｗを上記加熱ゾーン１へ送り込む複数
対の送り込み用駆動ローラ６が、加熱ゾーン１の図示右
側と上記静電噴射ガン３の後述する照準点ａとの間の均
熱ゾーン２には加熱ゾーン１を通過した異形鉄筋を上方
周面で受ける自由回転可能な受はローラ７が、さらに上
記静電噴射ガン３と冷却ジャケットとの間の塗料硬化ゾ
ーン４には複数の送り用ローラ８が設けられていて、異
形鉄筋は上記送り込み用駆動ローラ６および送り用ロー
ラ８の矢印方向への回動により塗装ラインＰＬ上を矢印
り方向へ軸方向送りされ、加熱ゾーンエから冷却ジャケ
ット５まで順次所定の送り速度で送られる。In the painting line PL, 1 is a heating zone, 2 is a soaking zone, 3 is a plurality of electrostatic spray guns, 4 is a paint curing zone, and 5 is a cooling jacket. Also, on the left side of the heating zone 1 in the figure, a plurality of pairs of feeding drive rollers 6 for feeding deformed reinforcing bars W into the heating zone 1 are connected to the right side of the heating zone 1 in the figure and the aiming point a, which will be described later, of the electrostatic spray gun 3. In the soaking zone 2 between them, there is a freely rotatable roller 7 which receives the deformed reinforcing bars that have passed through the heating zone 1 on its upper circumferential surface, and there is also a paint hardening zone 4 between the electrostatic spray gun 3 and the cooling jacket. is provided with a plurality of feed rollers 8, and the deformed reinforcing bar is axially fed in the direction of the arrow on the painting line PL by the rotation of the feed drive roller 6 and the feed roller 8 in the direction of the arrow. It is sequentially fed from the heating zone E to the cooling jacket 5 at a predetermined feeding speed.
上記加熱ゾーン１には本実施例では所定間隔を隔ててそ
れぞれ多巻された２個のコイルＣ１・Ｃ２が配設されて
おり、当該コイルＣＩ・Ｃ２それぞれは図示しない所定
出力・周波数からなる加熱電源に接続されており、送り
込み用駆動ローラ６により入側から送り込まれる異形鉄
筋をコイルＣ１・Ｃ２それぞれを通過する間に表面加熱
し、その加熱表面の最高温を示す部分−ｍ−−−−−・
通常ふし等の突出端が昇温しやすい−・−・の温度が予
熱所定温度（例えば２３０〜２５０℃とされている）よ
り１０〜２０℃高温を示すまで加熱可能に設定される。In the heating zone 1, in this embodiment, two multi-turn coils C1 and C2 are arranged at a predetermined interval, and each of the coils CI and C2 performs heating at a predetermined output and frequency (not shown). The surface of the deformed reinforcing bar that is connected to the power source and fed from the entry side by the feeding drive roller 6 is heated while passing through each of the coils C1 and C2, and the portion showing the highest temperature of the heated surface -m------ −・
Normally, the temperature at which the protruding end of the closure or the like tends to rise is set to be 10 to 20 degrees Celsius higher than the preheating predetermined temperature (for example, 230 to 250 degrees Celsius).
上記均熱ゾーン２は加熱ゾーン１を出た異形鉄筋の不均
一に昇温しでいる表面が、熱伝導と放冷とで本体、ふし
等を問わずほぼ均一な予熱所定温度になるに必要な時間
経過を得るに適切な如く、異形鉄筋の形状−・−・・直
径、ふしまたはリブの形状。The above-mentioned soaking zone 2 is necessary for the unevenly heated surface of the deformed reinforcing bar that has left the heating zone 1 to reach a preheated predetermined temperature that is almost uniform regardless of the body or the lid through heat conduction and cooling. The shape of the deformed reinforcing bars--the diameter, the shape of the ties or ribs, as appropriate to obtain the appropriate time course.
質量等−・・−と送り速度との関係から長さが設定され
る。The length is set based on the relationship between the mass, etc. and the feed rate.
上記複数基の静電噴射ガン３は、本実施例では塗装ライ
ンＰＬの上方に１基３イが、下方に２基３０および３ハ
が設けられており、当該静電噴射ガン３イ、３０および
３ハそれぞれは全て照準点ａを均熱ゾーン２の終点とし
、例えば第１図（ｂ）に示す如く３イは塗装ラインＰＬ
の鉛直面上にあって４５°の角度をもって送り方向斜め
後方から、また３０および３ハそれぞれは上記３イに対
しかつ相互に１２０°の角度を維持して送り方向斜め後
方４５°の角度から、それぞれ上記照準点ａにノズルを
向けて配置されている。In this embodiment, the plurality of electrostatic spray guns 3 are provided with one set 3A above the painting line PL, and two sets 30 and 3H below the painting line PL. For each of 3C and 3C, aim point a is the end point of the soaking zone 2. For example, as shown in Figure 1(b), 3C is the painting line PL.
30 and 3 are each maintained at an angle of 120° with respect to 3A and to each other from an angle of 45° diagonally backward in the feeding direction on the vertical plane of , are arranged with their nozzles facing the aiming point a.
上記塗料硬化ゾーン４は上記静電噴射ガン３により異形
鉄筋表面へ付着せしめられた粉体塗料が溶融して硬化す
るには少なくとも４５秒、好ましくは６０秒必要であり
、その間非接触状態を維持することが望ましいが、異形
鉄筋の長さ上から非接触状態での送りは困難であるため
、当該塗料硬化ゾーン４内に単数もしくは複数の送り用
ローラ８が設けらることとなる。The paint curing zone 4 requires at least 45 seconds, preferably 60 seconds, to melt and harden the powder paint applied to the surface of the deformed reinforcing bars by the electrostatic spray gun 3, during which time a non-contact state is maintained. However, since it is difficult to feed the deformed reinforcing bars in a non-contact state due to their length, one or more feeding rollers 8 are provided within the paint curing zone 4.
上記送り川口〜う８は上方周面が塗装ラインＰＬとなる
如く配置され、当該送り用ローラ８それぞれには９とし
て示す冷却水噴射ノズルが付設される。当該冷却水噴射
ノズル９は第１図（ｂ）゛および（Ｃ）に示す構成から
なり、送り方向後方側から送り用ローラ８の上方周面の
略接線方向に沿うが如き冷却水の細流を噴射可能に設定
され、送り用ローラ８の上方周面と粉体塗料が付着して
いる移動中の異形鉄筋との接触点を瞬時冷却水で冷却し
、溶融状態にある塗料の表面を一時的に固化して送り用
ローラ８への付着を防止するように構成しである。The feed rollers 8 are arranged so that their upper peripheral surfaces correspond to the painting line PL, and each of the feed rollers 8 is provided with a cooling water spray nozzle shown as 9. The cooling water injection nozzle 9 has the configuration shown in FIGS. 1(b) and 1(C), and sprays a trickle of cooling water along a substantially tangential direction of the upper peripheral surface of the feeding roller 8 from the rear side in the feeding direction. The contact point between the upper peripheral surface of the feed roller 8 and the moving deformed reinforcing bar to which the powder paint is attached is cooled with instantaneous cooling water, and the surface of the molten paint is temporarily cooled. The structure is such that it solidifies and prevents it from adhering to the feed roller 8.
上記冷却ジャケット５は上記塗料硬化ゾーン４を通過し
て表面の塗料が硬化した異形鉄筋が、未だかなり高い温
度を維持しているので、これを順次全周方向から水冷し
て塗装ラインＰＬ外に搬出し易くするため、塗料硬化ゾ
ーン４の前方に設けられる。The cooling jacket 5 passes through the paint curing zone 4 and the deformed reinforcing bars on which the paint on the surface has hardened still maintain a fairly high temperature. It is provided in front of the paint curing zone 4 to facilitate transport.
本発明者は本発明の効果を確認するため、各種の実験を
行った。その一部を以下に開示する。The inventor conducted various experiments to confirm the effects of the present invention. Some of them are disclosed below.
〔実験例、１〕
加熱終了から均熱までに要する時間の確認実験○供試体
、ＪＩＳ、Ｇ３１１２規格品
○実験方法；第１図（ａ）に示される塗装ラインを用い
、各種径の異形鉄筋を誘導加熱コイル内を通過させて最
高昇温を示す部分における加熱温度を種々かえて加熱し
たのち放冷しく塗装せず）、それぞれ全表面均一温度と
なるまでに要する時間および冷却特性曲線を求めた。[Experiment example, 1] Confirmation experiment of the time required from the end of heating to soaking ○Specimen, JIS, G3112 standard product ○Experiment method: Using the painting line shown in Figure 1 (a), deformed reinforcing bars of various diameters were was passed through an induction heating coil and heated by varying the heating temperature at the part showing the highest temperature rise, then left to cool without painting), and the time required to reach a uniform temperature on the entire surface and the cooling characteristic curve were determined for each. Ta.
ただし、誘導加熱電源は出力；８Ｂｋ 、周波数；１５０ＫＨｚであった。However, the output of the induction heating power supply is 8Bk. , frequency; 150 KHz.
Ｏ実験結果；第２図に示すとおりであった。The experimental results were as shown in FIG.
図は全表面均一温度となった時点を基準時に設定しであ
る。曲線に付した記号・番号はそれぞれ供試体の規格呼
び名を示す。In the figure, the time point when the entire surface temperature became uniform was set as the reference time. The symbols and numbers attached to the curves indicate the standard name of the specimen.
上記実験結果から、径差に拘わらず３０秒以内で全表面
均一温度が得られることが碌認された。From the above experimental results, it was confirmed that a uniform temperature on the entire surface could be obtained within 30 seconds regardless of the diameter difference.
〔実験例、２〕
塗装結果に及ぼす予熱（均一時の）温度の決定実験
Ｏ供試体、ＪＩＳ、Ｇ３１１２．ＤＩ６Ｏ実験方法；上
記と同様に塗装ラインを用い、供試体の予熱温度を種々
かえて塗装を施し、塗装後の供試体を前記［塗装鉄筋の
試験方法（案）」に記載に則した各種試験に付し、その
結果を調査した。[Experiment Example 2] Determination of preheating (uniform) temperature on coating results Experiment O specimen, JIS, G3112. DI6O experimental method: Using the same painting line as above, the specimen was painted at various preheating temperatures, and the painted specimen was subjected to various tests in accordance with the above [Test method (draft) for painted reinforcing bars]. The results were investigated.
ただし、各供試体の塗装膜厚は１９０ 〜２５０μ、塗装後は水冷を施さず 自然放冷とした。However, the coating film thickness of each specimen was 190 ~250μ, no water cooling after painting It was left to cool naturally.
○実験結果；別紙の第１表に示すとおりであった。同表
における○印は上記試験基準に合格、Δ印は不合格を示
す。○ Experimental results: As shown in Table 1 of the attached sheet. In the same table, the mark ○ indicates that the test standard has been passed, and the mark Δ indicates that it has failed.
上記実験結果から、一般に静電塗装では２３０〜２５０
”Ｃとされている予熱温度よりも１０〜２０°Ｃ高温で
も良好な結果が得られ、かつ高温予熱限界はほぼ２６０
°Ｃであることが確認された。From the above experimental results, it is generally 230 to 250 for electrostatic coating.
Good results can be obtained even at a temperature 10 to 20°C higher than the preheating temperature that is said to be 260°C.
It was confirmed that the temperature was °C.
〔実験例、３〕
塗料吹きつけから水冷までの時間条件の設定実験
○供試体；ＪＩＳ、Ｇ３１１２．Ｄ１６○実験方法；上
記と同様に塗装ラインを用い、予熱温度を２６０°Ｃに
一定とした供試体に塗料を吹きつけ、塗料吹きっけ後の
供試体に時間条件を種々がえて水冷し、曲げ試験に付す
とともに、ゲル分率を調査した。[Experiment Example 3] Experiment setting the time conditions from paint spraying to water cooling ○Specimen; JIS, G3112. D16○ Experimental method: Using the same painting line as above, paint was sprayed onto the specimen with a constant preheating temperature of 260°C, and after spraying the paint, the specimen was cooled with water at various time conditions. The gel fraction was investigated while being subjected to a bending test.
○実験結果；別紙の第２表に示すとおりであった。同表
におけるＯ印は上記試験による基準に合格、☆は僅かな
りラックが確認されたものである。○ Experimental results: As shown in Table 2 of the attached sheet. In the same table, the mark O indicates that the test passed the criteria determined by the above test, and the mark ☆ indicates that a slight amount of rack was observed.
上記実験結果から、塗料吹きっけから水冷までの時間は
少なくとも６０秒以上経過後を適切とすることが確認さ
れた。From the above experimental results, it was confirmed that the appropriate time from spraying the paint to cooling with water is at least 60 seconds.
上記の他、各種の実験を行ったが、塗料膜厚の均一化に
は、下記条件が最適であることを見いだした。In addition to the above, various experiments were conducted, and it was found that the following conditions were optimal for making the thickness of the paint film uniform.
★供試体・ガン圃の距離；３００ｍｍ程度★静電塗装ガ
ンの数；３〜４基
★静電塗装ガンの角度；９Ｑ”＞４５” （送り方向
後方から前方
へ向けて）
★粉体塗料吐出ｉ１；５０ｇ／分（１ガン当り）★印可
電圧；−８０ＫＶ
尚、上記いずれの実験例においても、塗装後の供試体に
ピンホールは認められなかった。★Distance between specimen and gun field: Approximately 300mm ★Number of electrostatic coating guns: 3 to 4 ★Angle of electrostatic coating guns: 9Q">45" (from rear to front in feeding direction) ★Powder coating Discharge i1: 50 g/min (per gun) *Applied voltage: -80 KV In any of the above experimental examples, no pinholes were observed in the specimens after coating.
（発明の効果）
本発明を実施することにより、ふしまたはリブ付き等異
形鉄筋への高品質のエポキシ系粉体塗料静電塗装を短時
間、低コストかつ大量生産方式で施すことが可能となり
、海洋コンクリート構造物は勿論のこと一般鉄筋コンク
リート構造物への使用の普及が促進されることとなり、
鉄筋コンクリート構造物の耐腐食性を格段に向上するの
で、極めて顕著な効果をマす。(Effects of the Invention) By carrying out the present invention, it becomes possible to apply electrostatic coating of high quality epoxy powder paint to deformed reinforcing bars such as those with hooks or ribs in a short time, at low cost, and in a mass production manner. The use of this technology will be promoted not only for marine concrete structures but also for general reinforced concrete structures.
It greatly improves the corrosion resistance of reinforced concrete structures, so it has an extremely significant effect.
また、従来では予熱時間が長時間にわたるため、ｐｃ用
異形鉄筋は機械的性質の劣化を来すとして静電塗装通用
は全く考えられていなかったが、本発明では予熱が極端
に短時間で済むので、機械的性質の低下を惹起する虞な
く塗装し得ることとなり、同時にｐｃ鉄筋コンクリート
構造物の耐腐食性の向上にも資するものとして有用性が
甚大である。In addition, in the past, the long preheating time required for deformed reinforcing bars for PCs, leading to deterioration of their mechanical properties, so it was never considered possible to use electrostatic coating, but with the present invention, preheating can be done in an extremely short time. Therefore, it can be coated without the risk of deterioration of mechanical properties, and at the same time it is extremely useful as it contributes to improving the corrosion resistance of PC reinforced concrete structures.
第１図（ａ）は本発明の一実施例装置の正面図、第１図
（ｂ）は静電噴射ガンの配置例を示す上面図、第１図（
ｃ）および（ｄ）はそれぞれ本発明実施例装置に使用さ
れる送り用ローラの正面図および側面図、第２図は〔実
験例、１〕における各供試体の放冷による温度低下状態
を示す線図である。FIG. 1(a) is a front view of an apparatus according to an embodiment of the present invention, FIG. 1(b) is a top view showing an example of the arrangement of an electrostatic spray gun, and FIG.
c) and (d) are respectively a front view and a side view of the feed roller used in the apparatus according to the embodiment of the present invention, and FIG. 2 shows the state of temperature reduction due to cooling of each specimen in [Experiment Example 1]. It is a line diagram.
Claims (1)
予熱し、その表面にエポキシ系粉体塗料を静電塗装する
場合において、上記異形鉄筋を軸方向送りしつつ誘導加
熱手段により所定予熱温度よりも１０〜２０℃高温に加
熱のうえ、送り速度と異形形状とから定まる表面均熱ま
での所定時素後に異形鉄筋の表面へエポキシ系粉体塗料
を静電噴射するようにし、次いで可及的に少数配置した
送りローラと塗料被覆異形鉄筋表面との接触点に冷却水
の細流を流すようにして搬送し、少なくとも粉体塗料硬
化後に塗装鉄筋の表面を水冷するようにしたことを特徴
とする異形鉄筋の塗装方法。 ２）異形鉄筋を軸方向送りするローラ群、送り通路に沿
つて設けられた誘導加熱コイル、複数基の静電噴射ガン
および冷却ジャケットから構成され、上記誘導加熱コイ
ルと静電噴射ガンとの配置間隔を送り速度と異形形状と
から定まる所定間隔に設定し、上記複数基の静電噴射ガ
ンは送り通路の周方向に均等角度で分散配置されるとと
もに、送り通路斜め後方から所定角度をもつて送り通路
の一点に照準を集中する如く設定され、当該静電噴射ガ
ンと上記冷却ジャケットとの配置間隔は少なくとも異形
鉄筋表面に付着した粉体塗料が硬化可能な時間以上の送
り時間経過距離とし、その間に間に配置されて上方周面
に接触する異形鉄筋を搬送可能な単数もしくは複数の送
り用ローラは冷却水ノズルを具えていて、当該冷却水ノ
ズルが送り方向後方側からた駆動ローラの上方周接線沿
いに冷却水の細流を噴流可能に設定されていることを特
徴とする異形鉄筋の塗装装置。[Scope of Claims] 1) In the case of preheating pretreated deformed reinforcing bars such as those with tabs or ribs, and electrostatically coating the surface with epoxy powder coating, the deformed reinforcing bars are fed in the axial direction. The reinforcing bars are then heated to a temperature 10 to 20°C higher than the specified preheating temperature using induction heating means, and after a predetermined period of time until the surface is uniformly heated as determined by the feeding speed and irregular shape, epoxy powder paint is electrostatically applied to the surface of the irregular reinforcing bars. The surface of the painted reinforcing bars is cooled with water at least after the powder coating has hardened. A method for painting deformed reinforcing bars. 2) Consists of a group of rollers that feed deformed reinforcing bars in the axial direction, an induction heating coil installed along the feeding path, multiple electrostatic spray guns, and a cooling jacket, and the arrangement of the induction heating coils and electrostatic spray guns. The spacing is set at a predetermined interval determined from the feed speed and the irregular shape, and the plurality of electrostatic spray guns are distributed at equal angles in the circumferential direction of the feed passage, and at a predetermined angle from diagonally rearward of the feed passage. The setting is such that the aiming point is concentrated on one point in the feeding path, and the distance between the electrostatic spray gun and the cooling jacket is such that the feeding time elapsed distance is at least longer than the time required for the powder coating adhered to the surface of the deformed reinforcing bars to harden; The single or plural feed rollers arranged between them and capable of conveying the deformed reinforcing bars in contact with the upper circumferential surface are equipped with cooling water nozzles, and the cooling water nozzles are arranged above the drive rollers from the rear side in the feeding direction. A coating device for deformed reinforcing bars, characterized by being set so that a trickle of cooling water can be jetted along the circumferential tangential line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60140235A JPH0616868B2 (en) | 1985-06-28 | 1985-06-28 | Method and apparatus for coating deformed rebar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60140235A JPH0616868B2 (en) | 1985-06-28 | 1985-06-28 | Method and apparatus for coating deformed rebar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS621468A true JPS621468A (en) | 1987-01-07 |
| JPH0616868B2 JPH0616868B2 (en) | 1994-03-09 |
Family
ID=15264051
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60140235A Expired - Fee Related JPH0616868B2 (en) | 1985-06-28 | 1985-06-28 | Method and apparatus for coating deformed rebar |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0616868B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4916365A (en) * | 1987-08-31 | 1990-04-10 | Anritsu Corporation | Color CRT displaying correction circuit |
| JPH0298160U (en) * | 1989-01-23 | 1990-08-06 | ||
| JP2015206181A (en) * | 2014-04-18 | 2015-11-19 | 昌昭 佐久田 | Vessel for plant device and installation method of vessel |
| CN108758102A (en) * | 2018-05-02 | 2018-11-06 | 中国石油天然气集团公司 | A kind of outer surface of steel tube 3PE antisepsis production lines and anticorrosion process |
| US10486174B2 (en) | 2007-02-12 | 2019-11-26 | Tcms Transparent Beauty Llc | System and method for applying a reflectance modifying agent electrostatically to improve the visual attractiveness of human skin |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6014971A (en) * | 1983-07-04 | 1985-01-25 | Dainippon Toryo Co Ltd | Powder coating method of reinforcing bar |
-
1985
- 1985-06-28 JP JP60140235A patent/JPH0616868B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6014971A (en) * | 1983-07-04 | 1985-01-25 | Dainippon Toryo Co Ltd | Powder coating method of reinforcing bar |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4916365A (en) * | 1987-08-31 | 1990-04-10 | Anritsu Corporation | Color CRT displaying correction circuit |
| JPH0298160U (en) * | 1989-01-23 | 1990-08-06 | ||
| US10486174B2 (en) | 2007-02-12 | 2019-11-26 | Tcms Transparent Beauty Llc | System and method for applying a reflectance modifying agent electrostatically to improve the visual attractiveness of human skin |
| JP2015206181A (en) * | 2014-04-18 | 2015-11-19 | 昌昭 佐久田 | Vessel for plant device and installation method of vessel |
| CN108758102A (en) * | 2018-05-02 | 2018-11-06 | 中国石油天然气集团公司 | A kind of outer surface of steel tube 3PE antisepsis production lines and anticorrosion process |
| CN108758102B (en) * | 2018-05-02 | 2020-06-23 | 中国石油天然气集团公司 | 3PE anti-corrosion production line and anti-corrosion process for outer surface of steel pipe |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0616868B2 (en) | 1994-03-09 |
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