Quais são as falhas comuns dos sistemas de corredor quentes?

As falhas comuns dos sistemas de corredor quente são as seguintes:
Falha de controle de temperatura
Temperature is too high: It may be a thermostat failure, such as damage to internal electronic components, resulting in abnormal control of the heating element, causing the temperature to continue to rise. A short circuit in the heating element can also cause this situation, such as damage to the insulation layer of the heating rod, abnormal increase in current, and excessive heat generation. In addition, improper installation of the O termopar, que não pode medir com precisão a temperatura real, também pode fazer com que o termostato julgue incorretamente, e o aquecimento contínuo fará com que a temperatura seja muito alta .
Temperature is too low: The reason may be aging or damage to the heating element, such as the resistance of the heating coil increases and the heating power decreases after long-term use. Thermocouple failures, such as line disconnection and poor contact, will prevent the thermostat from receiving accurate temperature signals, thereby erroneously reducing the heating output. In addition, power supply system failures, such as A tensão instável e a fonte de alimentação de perda de fase também podem levar a energia de aquecimento insuficiente e causar baixas temperaturas .
Falha de fluxo de fusão de plástico
Runner blockage: It is usually caused by impurities and foreign matter in the plastic particles entering the hot runner, or the plastic stays in the runner for a long time, carbonizing and agglomerating, which hinders the normal flow of the melt. In addition, unreasonable flow channel design, dead corners or narrow parts, can also easily cause material accumulation and blockage.
Melt leakage: Aging and damage of seals are common causes of melt leakage, such as the loss of elasticity and cracks of the sealing ring, which cannot be effectively sealed. Improper installation of components of the hot runner system, such as uneven tightening force of bolts, resulting in gaps between components, can also cause melt leakage. In addition, cracks in the flow channel due O calor e pressão a longo prazo também podem causar vazamento de fusão .
Taxa de fluxo desigual: isso pode ser devido a temperaturas desiguais em várias áreas de aquecimento do sistema de corredor quente, resultando em viscosidade inconsistente do fusão de plástico, afetando assim a taxa de fluxo .}}}} O design, como tamanho de bico inconsistente e formato de canal de fluxo irregular, também pode causar vazão desigual .
Falha no bico quente
Bloqueio do bico quente: pode ser devido a impurezas no derretimento de plástico, cabeça de material frio, etc . bloqueando o bico quente . A válvula da agulha no bico quente não é flexível e não pode ser totalmente aberta, o que também causará um fluxo de material e bloqueio de material ruim .}}
Hot nozzle leakage: The sealing surface of the hot nozzle is damaged, such as long-term contact with the mold, or scratched by foreign objects, which will reduce the sealing performance and cause leakage. The gap between the needle valve of the needle valve hot nozzle and the hot nozzle body is too large, or the seal of the needle valve is damaged, which will also cause leakage.
Abnormal hot nozzle temperature: Failure of the heating element of the hot nozzle, such as burning of the heating wire, will cause the temperature of the hot nozzle to be too low. The poor insulation effect of the hot nozzle, the heat dissipation to the surrounding environment, or the inaccurate temperature control of the hot nozzle by the thermostat may cause the temperature of the hot nozzle to be too high.
Se o sistema de corredor quente falhar, afetará diretamente a qualidade e a eficiência da produção de produtos plásticos, portanto, são necessários diagnóstico e manutenção oportunos .