Clamp for detecting humidity resistance of sheet metal

Abstract

The invention discloses a clamp for detecting the humidity resistance of sheet metal. The clamp comprises a bracket, a first vise, a second vise and a digital tension meter, wherein the first vise, as well as the second vise, comprises a clamping plate and a plurality of spacer blocks capable of sliding forwards and backwards. By adopting the structure, the digital tension meter is used to enable a pulling force born by sheet metal to be monitored at any time, and the actual pulling force born by the sheet metal in the rolling process can be simulated. The sheet metal to be detected are positioned between the clamping plates and the spacer blocks or between two of the spacer blocks, damp and hot gas in the damp and hot environment easily passes through two pieces of sheet metal to be detected, so that the actual humidity resistant environment in which the sheet metal to be detected are positioned can be simulated. Therefore, the tested humidity resistance data can reflect the actual corrosion degree of the sheet metal. In addition, the clamp is reasonable in structural design; the sheet metal to be detected can be clamped or removed cushily so long as the clamping plates slightly move forwards and backwards, so that the operation is convenient.

Description

technical field [0001] 本发明涉及一种金属板材的检验装置,特别是一种金属板材耐湿热性能检测用夹具。 Background technique [0002] 耐指纹连续热镀锌板是对连续热镀锌板表面进行耐指纹处理的产品,主要用于制造电脑机箱、服务器和家电后背板等产品。表面耐湿热性能是衡量耐指纹连续热镀锌板质量优劣的主要指标之一,目的是检测钢卷在湿热环境中运输及储存时是否发生表面锈蚀。 [0003] 目前,检测耐指纹连续热镀锌板耐湿热性能的一般方法为:将待检测金属板材单片或叠片放置在恒温恒湿箱中,在一定的温度和湿度下放置一段时间后,目测或用色差仪检测钢板表面是否发黑或产生白锈。 [0004] 连续热镀锌生产线上在钢卷卷取过程中施加了一定的张力,因此在成卷后运输及储存过程中,钢板受到拉应力和压应力两种应力作用。而所受应力特别是拉应力会加速钢板在湿热环境下的腐蚀。由于,目前耐湿热检测装置或方法,未考虑金属板材在运输及储存时所受的应力状态,所测试耐湿热试验数据不能反映实际问题。如有些金属板材在耐湿热性能检测中没有出现问题,但是,在实际运输及储存过程中则出现了板面锈蚀的现象。 [0005] 2014年5月7日公开的申请号为201310753357.2的中国发明专利申请,公开了一种板材耐湿热性能检测用夹具,该检测夹具包括支架、带有锁紧螺母及锁紧螺栓的夹板以及拉伸用的8根弹簧。该专利申请,确实能在测试时,给金属板材施加一定的拉应力,然而,仍然存在着如下不足: [0006] 1. 金属板材所承受的拉应力太小或太大,所测试耐湿热的试验数据也依然不能反映实际问题。 [0007] 1)当金属板材所承受的拉应力太小时,金属板材受应力的影响小,变形小,在湿热环境下,腐蚀程度低,容易出现金属板材在耐湿热性能检测中没有问题,判定合格,但在实际运输及储存过程中又出现了板面锈蚀的现象。 [0008] 2)当金属板材所承受的拉应力太大时,金属板材应力的影响大,变形大,在湿热环境下的腐蚀程度快,容易出现金属板材在耐湿热性能检测中不良,判定不合格,但在实际运输及储存过程中不会出现板面锈蚀,也即误报的现象。为了提高检测判定的合格率,生产厂家需要重新返工或提高工艺水平,因而会增加生产或制造成本的投入。 [0009] 2. 金属...

AI Technical Summary

Problems solved by technology

Therefore, the test data of the tested heat and humidity resistance still cannot reflect the actual problems. It is easy to appear that the metal plate has no problem in the heat and humidity resistance test and is judged to be qualified, but the plate surface is corroded during the actual transportation and storage process.

[0010]3. The structural design is unreasonable, and it is very inconvenient to use: there are lock nuts and lock bolts around the metal plate. Unscrew all the lock nuts and lock bolts, and then remove the upper splint to place the metal plate

The whole operation is cumbersome, labor-intensive, and very inconvenient to use

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