封口机的工作原理是什么?

2025-01-22 12:33:28
推荐回答(5个)
回答1:

塑料袋封口机是一种适用于小型企业及家庭使用的热合封口设备。通常使用220V交流电源,加热功率为数百瓦。各厂家生产的封口机电路大同小异,现以FR-200型封口机为例,剖析其电路的工作原理和维修实例。

一、电路原理 电路见附图。该机标称加热功率350W,封口最大长度200mm。它有一个操作手柄,其作用有二:一是压下操作手柄后,将待封口塑料袋压在加热条上,二是压下电源开关K使之闭合。当开关K闭合后,交流电源经R1、R2降压,二极管D1整流.电容器C1滤波,向本机提供工作电源。该电源经R4、VR向C2充电。充电初期,C2上电压很小,三极管Q呈截止状态,其集电极为高电平,经电阻R6和发光管LED触发双向可控硅SCR,变压器T得电。其二是向加热元件RL供电,被实压在RL上的塑料袋受热而被封口。待C2充电致使三极管Q导通,集电极电压降低,不足以触发可控硅时,RL停止加热,抬起手柄,取出塑料袋,封口即告完成。手柄抬起,开关K断开后,C2经D2和R3迅速放电,为卜一次充电作好准备。发光管LED在RL通电期间,发光管用于指示。调整电位器VR可改变每次封口加时的长短,具体调整幅度可根据工作时的电源电压和被封口塑料的厚度试验决定。

二、维修实例 本机常见的故障原因为变压器烧坏,可控硅损坏,发热条断裂等。实例1:压下手柄,开关K闭合,RL通电加热不停,最终将塑料袋封口部位加热熔断;修理时焊下可控硅,用万用表测量之,发现T1和T2极间已击穿。更换可控硅后即可修复。可控硅选3A/600V的,例如TLC336A。

实例2:压下手柄后,不能加热封口。打开外壳目测发现变压器已烧坏,测量变压器的初级线圈已断。此时可用次级电压约25V、功率与原相同的变压器代换后即可修复之。本机变压器为间歇通电工作,因此其功率容量约350W。如果气温偏高,或连续使用时间过长,有可能导致变压器损坏,这在使用中应予注意。

实例3:压下手柄后,通电加热时,加热的温度不能调整。维修时,主要检查电位器VR,因VR经常被转动,导致VR的碳膜片损坏。用新的VR换之,即可。
三极管T1与线圈L1及L2等组成反馈式振荡电路。振荡电压经变压器B升压后,点燃紫外光管,发出紫外光供验币用。

图中三极管T1用3DD5,要加装散热片。变压器B可用E型铁钛氧磁芯(截而积为12×12毫米)用&0.71毫米漆包线绕30匝及20匝为L1,L2,L3则用&0.31毫米漆包线绕480匝。紫外光管DG应选用波长为380~420微米,功率为4W的。电源E用干电池两节(共3V)。接通电源后,调节电位器(2KΩ),使发光最强即可。

验币时应在周围光线较暗的地方,将纸币放在紫外光下,大面额真币应有荧光暗记显出,而伪币则没有;小额真币在紫外光下不反光,而伪币则有白兰色反光。

回答2:

封口机有很多种,但原理都是相同的。利用高温将袋口熔化、粘合。不同材质的袋子要用不同的温度,而袋子也又有薄有厚,温度也会有所不同。
手动的封口机就是这样,只要调个时间温度就可以。自动的,也就是连续的,那它就会有个输送台,调试好温度速度等参数后,将产品放在输送台上,当然需要封的口是在封口机的封口处了,也就是加热块上。这样它就可以按照调好的速度自动完成接下来的工作了。
还不明白也可到我公司的网站上看一下,里面挺详细的。要不再来问我也行,我叫小洪,随便一查都有我的联系方式的。

回答3:

利用高温(大概90度)
将塑胶袋口合起来!

其中,有一个超温控制器和加热器相连的,
当温度达到预设温度时,它就会停止加热工作!

回答4:

一句话,受热 熔合 哈……

回答5:

塑料袋封口机内部结构及工作原理看起来是不是挺简单的

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