泊睿BR-PV-TBK接线盒孔口盖击开试验机

仪器简介：

接线盒孔口盖敲落试验MST44
目的
组件接线盒壁上可敲落的孔口盖在正常使用时的外力下应保持在原位，在现场安装性配线系统时应能方便地敲落。
试验条件
一个带可敲落孔口的聚合物接线盒样品将在环境温度25C下“以收到样品时的状态”进行试验；
另一个带可敲落孔口的聚合物接线盒样品将在-20±1C下放置5h。放置后该接线盒应立即重复上述试验。
程序
试验程序如下：
第一步 用一个最短38mm长、直径6.4mm的平头圆轴对敲落盖施加44.5N的力，持续施力1min。施力方向与孔盖平面垂直，加在最可能引起敲落盖移动的位置。1h后测量孔盖和接线盒壁的错位。
第二步 用一个螺丝刀当凿子，把敲落盖击开。敲落后允许螺丝刀刃边沿已经打开的内壁划一周，以除去留在边缘上的碎片。
第三步 对另外两个敲落盖重复第一步和第二步。
如果接线盒的一个敲落盖可以有多个直径的开孔，当小直径敲落盖被击开时，大直径敲落盖应无移动。
合格判据
敲落盖在施加上述稳定的作用力后仍应保持在原位，并且所测敲落盖和开口之间的错位应不大于0.75mm。
敲落盖应容易地敲落，且不造成任何尖锐边缘或对接线盒产生任何损坏。

技术参数：

1) 38mm长、直径6.4mm的平头圆轴
2) 接线盒夹具
3) 砝码自动升降装置...

主要特点：
参照IEC 61730:2-2004及EN 168相关标准设计

BR-PV-TBK Terminal Box Knockout Tester
Implementation of standards: IEC 61730-2:2004 & Ed.2, VDE 0126-5:2008, EN 168

Mandrel: minimum 38mm long by 6.4 mm diameter Junction box fixture: adjustable Load force: 44.5N Mandrel and poise lifting: pneumatic control The test for hydrostatic test, must reduce or eliminate the drop impact force influenceing test results. Gas pressure method, adjustable speed, avoid the impact caused by direct terminal box knockout. Mandrel and pressure bar is separate, when mandrel pressure to junction box, mandrel and pressure bar separate, At this time knockouts force only mandrel add poise, have nothing to do with gas pressure. Attachment: ① Timer or mobile phone time ② Low temperature test chamber ③ Gap measurement and sharpness of edge determination

Purpose:
Removable hole covers in the walls of module terminal enclosures (knockouts) shall remain in place under nominal force application and also be easily removed for the field application of permanent wiring system components.
Condition:
A sample of the polymeric terminal box with knockouts will be tested in an “as-received” condition at a 25°C ambient temperature. Another sample of the polymeric box is to be conditioned for 5h in air maintained at -20°C±1°C. The test shall be repeated on the box immediately following this conditioning.
Procedure:
The knockout shall be easily removed without leaving any sharp edges or causing any damage to the box.
The procedure is as follows:
Step 1 A force of 44.5N shall be applied to a knockout for 1min by means of a mandrel, minimum 38mm long by 6.4 mm diameter, with a flat end. The force is to be applied in a direction perpendicular to the plane of the knockout and at the point most likely to cause movement. Wait 1 h and measure the displacement between the knockouts and the box.
Step 2 The knockout shall then be removed by means of a screwdriver, used as a chisel. The edge of a screwdriver blade may be run along the inside edge of the resulting opening once only, to remove any fragile tabs remaining along the edge.
Step 3 Repeat steps 1 and 2 on two additional knockouts. For a box employing multi-stage knockouts, there shall be no displacement of a larger stage when a smaller stage is removed.
Pass criteria:
The knockout shall remain in place after the application of the steady force and the clearance between the knockout and the opening shall not be more than 0.75 mm when measured. The knockout shall be easily removed without leaving any sharp edges or causing any damage to the box.