概述
鑄鋁加熱器經(jīng)精加工后它能和被加熱體緊密貼合。其使用溫度一般在攝氏150～450度之間，可廣泛應(yīng)用于塑料機械、模頭、電纜機械、化工、橡膠、石油等設(shè)備上。是以管狀電熱元件為發(fā)熱體，并彎曲成型，用優(yōu)質(zhì)鑄材料為外殼，外殼以離心式澆鑄成各種形狀的電加熱器，有圓型、平板、直角型、風(fēng)冷、水冷及其它異型等。
技術(shù)特性
1.鑄鋁加熱器表面負(fù)荷可達(dá)到2.5-4.5w/cm2，最高工作溫度300-450℃之間；
2.鑄鋁加熱器是一種高效熱分部均勻的加熱器，熱導(dǎo)性極佳的金屬合金，確保熱面溫度均勻，消除了設(shè)備的熱點及冷點。具有長壽命、保溫性能好、機械性能強、耐腐蝕、抗磁場等優(yōu)點。將外散熱面增加保溫裝置，內(nèi)散熱面燒結(jié)紅外線這樣可節(jié)約用電35%。
應(yīng)用范圍
主要用于塑料工業(yè)注塑機、擠出機和吹塑機的加熱，同時也可用于反應(yīng)釜、熔體管道等化工領(lǐng)域的加熱。
產(chǎn)品結(jié)構(gòu)
采用電加熱管，澆鑄在鋁或銅等金屬材料中，加熱絲與空氣隔絕，加熱體堅固耐用，加熱均勻，熱交換迅速，可在加熱體內(nèi)設(shè)置冷卻水道或風(fēng)道。特殊環(huán)境中采用防爆接線盒，如需保溫，則配置保溫層。
技術(shù)參數(shù)
鑄鋁工作溫度可達(dá)350℃，功率密度可高至3.5W/cm2。
鑄銅工作溫度可達(dá)650℃，功率密度可高至8W/cm2。
Application
It is mainly applied to heating the plastic injection molding machine, extrusion machine and blowing machine. Meantime, it also can be used to heat reaction kettle, melt pipe, etc in chemical industry.
Structure
The electric heating tube is adopted with its heating strip casted inside the metal material such as aluminum or copper and isolated from the air. The heating body is tough and durable, which heats evenly and exchanges heat very fast. Cooling water or air duct could be set up inside the heating body for option. In particular environment, we use anti-explosion junction box. If thermal preservation is needed, we shall add insulation layer.
Technical parameter
The working temperature and the power density of cast aluminum are respectively up to 350℃℃ and 3.5W/cm2.
These of cast copper are 650℃℃ and 8W/cm2.
鑄銅加熱器概述
鑄銅加熱器特點具有長壽命、保溫性能好、機械性能強、耐腐蝕、抗磁場等優(yōu)點。是以管狀電熱元件為發(fā)熱體，用優(yōu)質(zhì)銅鑄材料為外殼經(jīng)壓鑄成型的電加熱器，其使用溫度一般在攝氏150～600度之間，防爆加熱器防爆標(biāo)志為ExdⅡBT4 ExDⅡBT6 ExdeⅡCT6等.廣泛應(yīng)用于塑料機械、模具、電纜機械、合金壓鑄機、管道、化工、橡膠、石油等設(shè)備。
使用說明
1.應(yīng)放在干燥處、若因長期放置，絕緣電阻低于1MΩ時，可在攝氏200度左右的烘箱中烘烤5-6小時，即可恢復(fù)正常。
2.工作電壓不得超過額定值的10%；
3.接線部分放在加熱層、保溫層以外，外殼應(yīng)有效接地；
鑄銅加熱器使用注意事項
1.鑄銅加熱器應(yīng)做好定位固定,有效發(fā)熱區(qū)必須與受熱體緊密貼合，嚴(yán)禁空燒。發(fā)現(xiàn)表面有灰塵或污染物時，應(yīng)及時清除干凈再用，以免影晌散熱而縮短使用壽命。
2.電熱管出線端的氧化鎂粉，在使用場所避免受到污染物與水分滲入，防止漏電事故的發(fā)生。
3.工作電壓不得超過額定值的10%；空氣相對濕度不大于95%，無爆炸性和腐蝕性氣體。
4.接線部分放在加熱層、保溫層以外，外殼應(yīng)有效接地；避免與腐蝕性、爆炸性介質(zhì)、水份接觸;引接線應(yīng)能長期承受接線部分的溫度及加熱負(fù)載，接線螺絲緊固時應(yīng)避免用力過猛。
5.鑄銅電加熱圈應(yīng)放在干燥處、若因長期放置，絕緣電阻低于1MΩ時，可在攝氏200度左右的烘箱中烘烤5-6小時，即可恢復(fù)正常�；蚪档碗妷和娂訜�，直至恢復(fù)絕緣電阻。
加熱器的選型
目前市場上提供多種加熱器配置。用于塑料機械料筒加熱的有三類常見加熱器：云母、陶瓷關(guān)節(jié)及金屬鑄造加熱器。
一、云母加熱器：
云母加熱圈大約厚5mm，能適應(yīng)多種幾何形狀和特殊部件，如孔和凹槽，但云母用于加熱器絕緣層時，云母溫度不應(yīng)超過550℃。當(dāng)溫度超過該水平，粘合劑就開始退化，絕緣強度也將變?nèi)酰虼思訜崞鞯淖o套溫度不能超過450℃。以及云母加熱器的標(biāo)準(zhǔn)功率密度只有3W/cm2。目前云母加熱器已很難滿足越來越多塑料工藝的要求。
二、陶瓷加熱器：
陶瓷具有耐高溫絕緣性，因此陶瓷加熱器可處理760℃的溫度。陶瓷加熱器的柔軟可形成各種加熱器直徑。遺憾的是，陶瓷的優(yōu)點也是其弱點，由于它能存儲元件金屬絲產(chǎn)生的熱量，因此人們很難控制陶瓷加熱器的溫度。這會導(dǎo)致不必要的廢料，在塑料生產(chǎn)工藝的較早階段，這一點尤其突出。另外，陶瓷加熱器在拆裝過程中容易損壞，特別是升溫以后，加熱器會變得比較松散，給安裝帶來不便。陶瓷加熱器不能受到污染這一特性也限止了這類加熱器的應(yīng)用范圍。
三、 金屬鑄造加熱器：
金屬鑄造加熱器是將一定形狀的加熱管澆鑄在銅、鋁或鐵等材料中，這類加熱器體積較大，制作成本高，生產(chǎn)過程中能耗高，對環(huán)境有污染，以及使用時熱效率較低，國外已較少采用此類加熱器（除非特定要求）。
四、新型氧化鎂絕緣加熱圈
氧化鎂絕緣加熱圈是一種高性能的加熱器，采用導(dǎo)熱性能比傳統(tǒng)的云母和陶瓷更高的高純氧化鎂作為絕緣材料，一層薄薄的致密的氧化鎂填充在電熱絲與金屬外套之間，電熱絲的熱量迅速傳遞給被加熱物體，降低了電熱絲的溫度，大大的提高了加熱器的使用壽命。氧化鎂的耐高溫性和壓縮層具有卓越的導(dǎo)熱性能和絕緣強度，氧化鎂絕緣加熱圈的功率密度達(dá)到15W/cm2，使用溫度可達(dá)760℃，利用該性能可制造高效加熱器以適應(yīng)現(xiàn)代的塑料制造工藝。
考慮加熱器類型時，必須了解每種類型加熱器的性能和局限。零件的幾何形狀、溫度和加熱時間要求確定機器所需加熱器的類型。
每個類型加熱器都具有與眾不同的特點。當(dāng)加熱器加熱零件時，由內(nèi)部絕緣體提供必要的絕緣強度，所以區(qū)分這些加熱器的唯一材料是內(nèi)部絕緣體。每個加熱器中的絕緣體對加熱器的壽命和性能具有重要影響。
現(xiàn)代塑料加工工藝對加熱器的要求會更高，對溫度的均勻性、熱反應(yīng)性能、特殊材料所需的高溫要求以及倍受關(guān)注的熱效率，氧化鎂絕緣加熱器因其出色導(dǎo)熱性能和絕緣強度，在加熱器市場一定會占顯著地位。
Currently on the market offers a variety of heater configurations. There are three common types of heaters: mica, ceramic joints and metal casting heater for plastic machinery barrel heating.
●Mica heater:
Mica heating coil about the thickness of 5mm, can adapt to a variety of geometric shapes and special parts, such as holes and grooves, but mica for the heater insulating layer, mica temperature should not exceed 550℃. When the temperature exceeds this level, the adhesive begins to degenerate, the insulation strength is becoming weaker, so the heater sheath temperature must not exceed 450 ℃. Mica heater standard power density 3W/cm2. The mica heater has been difficult to meet the requirements of more and more plastic process.
●The ceramic heater:
Because of the high temperature ceramic insulation, the ceramic heater can be processed to a temperature of 760℃. The. The soft ceramic heater may be formed various heaters diameter. Unfortunately, the advantages of the ceramic is also its weakness, due to the heat generated can store element wire, so it is difficult to control the temperature of the ceramic heater. This causes unnecessary waste, in plastic an earlier stage of the production process, which is particularly prominent. In addition, the ceramic heater is easy to damage during disassembly, especially after the temperature, the heater will become more loose, to install the inconvenience. The ceramic heater of this feature can not be contaminated and also limiting the scope of application of such a heater.
●The metal casting heater:
Is a certain shape of the heating tube cast in copper, aluminum or iron material, this type of heater sizes, high production costs, high energy consumption in the production process, the pollution of the environment, as well as a lower thermal efficiency in the use of foreign been less used to this type of heater (unless a specific request).
●The new magnesium oxide insulated heating coil：
Magnesium oxide insulated heating coil is a high performance heater, thermal conductivity than the traditional mica and ceramic higher purity magnesium oxide as the insulating material, a thin layer of dense magnesium oxide filled in electric wire and metal jacket between the heat of the heating wire quickly passed to the object to be heated, reducing the temperature of the heating wire, greatly improve the life of the heater. Magnesium oxide of high temperature and compression layer has excellent thermal conductivity and dielectric strength, magnesium oxide insulated heating coil power density 15W/cm2 use temperatures up to 760℃, the use of the performance can be manufactured efficient heater to adapt to the modern plastic manufacturing process.
Considering the type of heater, you must understand the performance and limitations of each type of heater. Part geometry, temperature and heating time required to determine the type of machine desired heater.
Each type heater has distinctive features. When heated by a heater parts, by the internal insulator to provide the necessary dielectric strength, so the only material to distinguish these heater internal insulator. The insulator of each heater has an important impact on the life and performance of the heater.
Modern Plastics Processing and process requirements of the heater will be higher, temperature uniformity, thermal reaction performance, high temperature requirements of special materials required, and the thermal efficiency of a well-focused, magnesium oxide insulation heater because of its excellent thermal conductivity and dielectric strength will figure prominently in the heater market.
