JPS618168A - Heating oven for coating resin - Google Patents

Abstract

PURPOSE:To make it possible to hold all products passes through a heating space to predetermined uniform temp., by setting the upper hermetically closed space of a metal box body to a heating space and forming the feed-in port for feeding each product into the main body of a heating oven and the feed-out port of the heated product below the heating space. CONSTITUTION:In a metal ox shaped heating oven 1, of which the upper part is hermetically closed, for heating metal products 7 having to receive the coating of a resin, the feed-in port 3 of each product 7 to be heated and the feed-out port 4 of the heated product 7 are formed below a heating space 2. That is, because the products are continuously sent into the heating space 2 to receive heating, even if the feed-in port 3 and the feed-out port 4 are always opened, the high temp. air filling the heating space 2 prevents the invasion of the low temp. open air and predetermined temp. can be held without generating the rapid change in temp. within the heating space 2. As a result, all products passes through the heating space 2 are held to predetermined uniform temp. to bring a resin film to a uniform state and a good quality product can be obtained.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は金属製品を樹脂コーティングする際、金属製品
を加熱するための加熱炉に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a heating furnace for heating metal products when coating the metal products with a resin.

〔従来の技術〕[Conventional technology]

台所用品、日用家庭用品、家具、電気製品等日常一般家
庭で使用される各種金属製品、更にはガードレール、ガ
ードフェンスその他産業分野において使用される金属製
品等はその表面を各種色彩の樹脂によりコーティングす
ることにより美麗な製品としまた素材を保護して防錆処
理をするようにしである。The surfaces of various metal products used in everyday households such as kitchen utensils, daily household items, furniture, and electrical appliances, as well as guard rails, guard fences, and other metal products used in the industrial field, are coated with various colored resins. This makes the product more beautiful, and also protects the material and provides anti-corrosion treatment.

このような金属製品を樹脂コーティングするには、製品
を加熱炉内において所定の時間所定の温度で加熱し、加
熱した製品を粉末樹脂を貯蔵する貯槽内に浸けて取り出
し、製品表面に付着する粉末樹脂を製品自体の熱により
溶かして樹脂被膜を形成し、樹脂コーティング作業を終
了するものである。To coat such metal products with resin, the product is heated at a predetermined temperature for a predetermined time in a heating furnace, and the heated product is immersed in a storage tank that stores powdered resin and taken out to remove the powder that adheres to the product surface. The resin is melted by the heat of the product itself to form a resin film, and the resin coating process is completed.

前記する加熱炉は上面を密閉した金属製大型箱体を基本
形状としており、加熱すべき金属製品の搬入口、加熱後
の金属製品の搬出口等は観音開きの扉或いは上昇又は下
降可能な扉により形成されている。加熱中は扉を密閉し
、加熱炉内への製品の搬入、加熱炉からの製品の搬出に
際しては扉を全面開放するようにしである。The above-mentioned heating furnace has a basic shape of a large metal box with a sealed top surface, and the entrance for the metal products to be heated and the exit for the metal products after heating are equipped with double doors or doors that can be raised or lowered. It is formed. The door is sealed during heating, and the door is fully opened when the product is brought into the heating furnace or taken out from the heating furnace.

しかも、搬入口および搬出口は製品の加熱空間と同じ高
さ位置にある。Moreover, the loading inlet and the unloading outlet are located at the same height as the product heating space.

〔発明が解決しようとする問題点〕[Problem that the invention seeks to solve]

従って、加熱炉内への製品の搬入、加熱炉からの製品の
搬出の都度扉を全面開放するため、加熱炉内の高熱が外
部へ流出し、また同時に低温の外気が加熱炉内に流入し
て加熱炉内に急激な温度変化を生じさせ一時的に加熱炉
全体の温度が低下する。このため加熱炉内を所定の温度
まで上げて製品加熱を行うためには必要以上の熱量と時
間を要し、熱効率が極めて悪く熱を無駄に使用して不経
済である。Therefore, since the door is fully opened each time a product is carried into the heating furnace or removed from the heating furnace, the high heat inside the heating furnace flows out to the outside, and at the same time, low-temperature outside air flows into the heating furnace. This causes a rapid temperature change within the heating furnace, and the temperature of the entire heating furnace temporarily decreases. For this reason, it takes more heat and time than necessary to raise the inside of the heating furnace to a predetermined temperature and heat the product, resulting in extremely low thermal efficiency and wasteful use of heat, which is uneconomical.

特に、樹脂コーティングすべき製品は、加熱炉内外を循
環するチェーンコンベアに適当な間隔で複数個吊り下げ
られ、一定の時間間隔で加熱炉内に搬入されるため前記
のような温度変化により製品ごとに又単体の製品自体で
も部分的に温度差を生じ、樹脂付着状態が不良なものと
なる。In particular, products to be coated with resin are hung at appropriate intervals on a chain conveyor that circulates inside and outside the heating furnace, and are brought into the heating furnace at regular intervals, so each product may be affected by the temperature changes described above. Moreover, even in a single product itself, temperature differences occur locally, resulting in poor resin adhesion.

更に、チェーンコンベアのような搬送装置自体も加熱炉
内を通るため高熱により損傷が激しく、整備点検、部品
交換等不経済なものであった。Furthermore, since the conveying device itself, such as a chain conveyor, passes through a heating furnace, it is severely damaged by the high heat, making maintenance inspections and parts replacement uneconomical.

〔問題点を解決するための手段〕 本発明は上記する従来の樹脂コーティングに使用する加
熱炉の種々欠点に鑑み、加熱炉内において製品を加熱す
べき空間を外部に開放することなく加熱炉内への製品の
搬入、加熱炉外への製品の搬出を可能とし、製品の大き
さ、材質の肉厚等に応じて常に所定の温度下で加熱可能
であり、製品温度を均一なものとする。[Means for Solving the Problems] In view of the various drawbacks of the conventional heating furnaces used for resin coating as described above, the present invention provides a method for heating products in the heating furnace without opening the space in which the product is heated to the outside. It is possible to carry products into and out of the heating furnace, and it is possible to always heat the product at a predetermined temperature depending on the size of the product, the thickness of the material, etc., and to make the product temperature uniform. .

このため製品の搬入口および搬出口を加熱空間より下方
に形成し、製品は加熱空間の上方を移動中に加熱可能と
なっている。For this reason, the product inlet and outlet are formed below the heating space, so that the product can be heated while moving above the heating space.

〔実施例〕〔Example〕

以下図面に従って本発明の一実施例を詳細に説明する。 An embodiment of the present invention will be described in detail below with reference to the drawings.

第１図、第２図において符合１は金属製箱状加熱炉本体
であり、密閉した上部空間を製品加熱空間２としてあり
、加熱炉本体ｌ内への製品の搬入口３およびこれと対称
位置にある加熱炉本体ｌがらの製品搬出口４は加熱空間
２より下方に開口形成しである。In FIGS. 1 and 2, reference numeral 1 indicates a metal box-shaped heating furnace main body, the sealed upper space is a product heating space 2, and a product introduction port 3 into the heating furnace main body 1 and a position symmetrical thereto. The product discharge port 4 of the heating furnace main body 1 is opened below the heating space 2.

上記する加熱炉本体１は小型製品、大型製品に合わせて
それぞれ設計製作してもよく、また小型製品、大型製品
に共用し得るようあらかじめ大型製品のみに合わせて製
作してもよい。The heating furnace main body 1 described above may be designed and manufactured to suit small products and large products, or may be manufactured in advance only for large products so that it can be used for both small and large products.

また加熱炉本体１は図面には示してないが複数本の支柱
により適当な高さ空間位置に安定して支持されている。Although not shown in the drawings, the heating furnace main body 1 is stably supported at an appropriate height and spatial position by a plurality of supports.

図中符合５は案内レールであって、前記加熱空間２の上
方において搬入口３側から搬出口４側方向へ二本平行に
設置しである。また６は電気、ガス等を熱源とする公知
の加熱装置である。Reference numeral 5 in the figure indicates guide rails, two of which are installed in parallel above the heating space 2 from the carry-in port 3 side to the carry-out port 4 side. Further, 6 is a known heating device that uses electricity, gas, or the like as a heat source.

樹脂コーティングすべき製品７は、加熱炉本体１外周を
循環するチェーンコンベアのような適宜搬送装置（図示
せず）に着脱自在に取りつけた長形枠体の公知のハンガ
ー８に吊り下げてあり、各ハンガー８間は一定の間隔が
保たれるようになっている。The product 7 to be resin-coated is suspended from a known hanger 8 in the form of a long frame that is removably attached to an appropriate conveyance device (not shown) such as a chain conveyor that circulates around the outer periphery of the heating furnace main body 1. A constant distance is maintained between each hanger 8.

搬送装置は一定の距離間隔で間欠移動となっており、い
ま搬入口３に面した位置で製品７が停止した場合搬送装
置から製品７を吊り下げたハンガー８を外す。製品７は
針金やフック等によりハンガー８に取りつけてあり樹脂
コーティングが終了するまでは一体的である。The transport device moves intermittently at regular intervals, and when the product 7 is stopped at a position facing the entrance 3, the hanger 8 on which the product 7 is suspended is removed from the transport device. The product 7 is attached to the hanger 8 with a wire, hook, etc., and remains integral until the resin coating is completed.

前記搬入口３に面して加熱炉本体１内に出入可能な適宜
機構の昇降装置（図示せず）を設置しておき、前記ハン
ガー８を昇降装置に載せて前記案内レール５の高さまで
上昇させ、ハンガー８をレール５上に移行させる。この
場合ハンガー８の最上昇位置に面して加熱炉本体１に空
圧或いは油圧シリンダー等を設け、シリンダーロンドの
往復動により昇降装置からレール５上にハンガー８を移
し変えるようにすればよい。これにより既にレール５上
にあるハンガー８は新たに移行したハンガー８の横巾間
隔だけ搬出口４側へ前進することになる。従って、搬出
口４に面しても加熱炉本体１内に出入可能な前記と同様
の昇降装置を設置し、この昇降装置をレール５の高さ位
置まで上昇させておけばレール５から押し出されるハン
ガー８を一台づつ受は止めて下降させ搬出口４がら外部
へ搬出可能となる。An elevating device (not shown) with an appropriate mechanism that can be moved in and out of the heating furnace main body 1 is installed facing the loading port 3, and the hanger 8 is placed on the elevating device and raised to the height of the guide rail 5. and move the hanger 8 onto the rail 5. In this case, a pneumatic or hydraulic cylinder or the like may be provided in the heating furnace body 1 facing the highest position of the hanger 8, and the hanger 8 may be transferred from the lifting device onto the rail 5 by the reciprocating movement of the cylinder rod. As a result, the hanger 8 already on the rail 5 moves forward toward the outlet 4 by the width interval of the newly moved hanger 8. Therefore, if an elevating device similar to the one described above is installed so that it can go in and out of the heating furnace body 1 even when facing the unloading port 4, and this elevating device is raised to the height of the rail 5, it will be pushed out from the rail 5. The hangers 8 are stopped and lowered one by one so that they can be carried out through the outlet 4.

尚、搬出口４に面して下方に、粉末樹脂を貯蔵する公知
の貯槽を設置し下降する製品７をそのまま樹脂内に浸け
るようにすれば製品７は加熱された温度を保持した状態
で樹脂コーティングが可能であるが、製品７を一旦外部
へ取り出した後に樹脂貯槽内に浸けるようにしてもよい
。Incidentally, if a known storage tank for storing powdered resin is installed in the lower part facing the outlet 4, and the descending product 7 is immersed in the resin, the product 7 will be stored in the resin while maintaining the heated temperature. Coating is possible, but it is also possible to immerse the product 7 in a resin storage tank after taking it out.

上記のように搬入口３から上昇して加熱炉本体１内に入
った製品７は加熱空間２を移動中に加熱され、下降して
搬出口４から取り出され、最終的に樹脂コーティングさ
れるが、更に樹脂コーティングした製品７を二次加熱炉
内で低温下で加熱し、樹脂表面を滑らかなものとするよ
うにしてもよい。As mentioned above, the product 7 that ascends from the loading port 3 and enters the heating furnace body 1 is heated while moving through the heating space 2, descends, is taken out from the loading port 4, and is finally coated with a resin. Furthermore, the resin-coated product 7 may be heated at a low temperature in a secondary heating furnace to make the resin surface smooth.

この二次加熱炉も前記と同様の加熱炉を使用することが
できる。As this secondary heating furnace, the same heating furnace as described above can be used.

尚、製品７の搬入、搬出は作業者が手作業により直接行
ってもよいが、危険防止のために搬送装置と搬入口３お
よび搬出口４間に適当な移動装置を設置し、搬送装置か
らハンガー８を自動的に取り外してこれを搬入口３例の
昇降装置に移し変え、また搬出口４から取り出すように
してもよい。Note that the loading and unloading of the products 7 may be carried out manually by the worker, but in order to prevent danger, an appropriate moving device should be installed between the conveying device and the loading entrance 3 and the loading exit 4. The hanger 8 may be automatically removed and transferred to the elevating device of the three loading ports, and may also be taken out from the loading port 4.

〔発明の効果〕〔Effect of the invention〕

本発明は上記に説明したように金属製箱体の上部密閉空
間を加熱空間２とし、加熱炉本体Ｉ内への製品の搬入口
３および加熱した製品の搬出口４を加熱空間２より下方
に形成したことにより、製品を連続的に送り込んで加熱
するため搬入口３および搬出口４を常に開口していても
、加熱空間２内部に充満する高温空気が低温外気の浸入
を防止し、加熱空間２内は急激な温度変化を発生するこ
となく所定の温度を保持することが可能であり、熱効率
もよく経済的である。As explained above, in the present invention, the upper sealed space of the metal box is used as the heating space 2, and the product inlet 3 into the heating furnace main body I and the heated product outlet 4 are located below the heating space 2. As a result of this, even if the loading inlet 3 and the unloading outlet 4 are always open in order to continuously feed and heat products, the high-temperature air filling the heating space 2 prevents low-temperature outside air from entering, and the heating space 2, it is possible to maintain a predetermined temperature without causing sudden temperature changes, and the heat efficiency is good and economical.

このため加熱空間２を通過した全ての製品は所定の均一
な温度を保持し、従って製品ごとに或いは製品の部分に
温度差を生ずることがなく樹脂被膜は均一な状態となっ
て良質の製品提供が可能となる。Therefore, all the products that have passed through the heating space 2 maintain a predetermined uniform temperature, so there is no temperature difference between products or parts of the product, and the resin coating is in a uniform state, providing high-quality products. becomes possible.

製品の搬送速度、加熱空間２内における加熱時間、加熱
温度等は製品の大きさや材質等と総合的に判断して自動
処理を可能とすることにより常に均一な樹脂被膜を有す
る製品を得ることが可能である。The conveyance speed of the product, the heating time in the heating space 2, the heating temperature, etc. are comprehensively determined based on the size and material of the product, etc., and by enabling automatic processing, it is possible to always obtain a product with a uniform resin coating. It is possible.

【図面の簡単な説明】[Brief explanation of drawings]

図面は本発明の一実施例を示し、第１図は加熱炉本体の
斜視図、第２図は使用状態を示す中央部の概略縦断面図
である。 １は加熱炉本体、２は加熱空間、３は製品搬入口、４は
製品搬出口である。 特　許　出　願　人　有限会社仲田コーティング代理人
　　　弁理士　　積　　１）　輝　　正ＱThe drawings show one embodiment of the present invention, and FIG. 1 is a perspective view of the heating furnace main body, and FIG. 2 is a schematic vertical cross-sectional view of the central part showing the state of use. 1 is a heating furnace main body, 2 is a heating space, 3 is a product loading port, and 4 is a product loading port. Patent applicant Nakada Coating Co., Ltd. Agent Patent attorney Product 1) Tadashi Teru Q

Claims (1)

【特許請求の範囲】[Claims] 樹脂コーティングをすべき金属製品を加熱する上部を密
閉する金属製箱型加熱炉において、加熱すべき製品の搬
入口および加熱した製品の搬出口を加熱空間より下方に
形成して成ることを特徴とする樹脂コーティング用加熱
炉。A metal box-type heating furnace whose upper part is sealed for heating metal products to be coated with resin, characterized in that an inlet for the product to be heated and an outlet for the heated product are formed below the heating space. Heating furnace for resin coating.