A pre-stretching die for stretching filter housing assembly blocks

Abstract

The invention relates to a prestretching die for stretching a filter outer shell assembling block. The prestretching die for stretching the filter outer shell assembling block is characterized in that the prestretching die comprises a lower die body and an upper die body which are matched with each other; the lower die body comprises a lower base plate, the lower base plate is provided with a supporting column, a supporting column flange is arranged on the lower side of the supporting column, an ejector rod is mounted on the upper side of the supporting column, the ejector rod is sleeved with a downward pressing pipe column, and a set of buffer springs are arranged between the lower side face of the downward pressing pipe column and the upper side face of the supporting column flange; the upper die body comprises an upper ejection plate, an upper push rod is arranged on the lower side of the upper ejection plate, and a stretching hole which is correspondingly matched with the ejector rod is formed in the bottom of the upper push rod. The prestretching die has the advantages that after a stretched filter outer shell is subjected to forward prestretching, the assembling block is fully deformed, and the phenomenon that the filter outer shell is deformed when the assembling block is formed is avoided; in addition, the prestretching die is simple in structure, convenient to operate and low in cost.

Description

technical field [0001] The invention relates to a processing device for a filter threaded cover plate, in particular to a pre-stretching die for stretching an assembly block of a filter shell. Background technique [0002] The air filter is located in the engine intake system, and it is an assembly composed of one or several filter components that clean the air. Its main function is to filter out harmful impurities in the air that will enter the cylinder, so as to reduce the early wear of the cylinder, piston, piston ring, valve and valve seat. The engine has three types of filters: air, oil, and hydraulic, generally referred to as "three filters". They are respectively responsible for the filtration of the medium in the engine intake system, lubrication system and combustion system. [0003] The filter housing is an important part of the filter. At present, when assembling and maintaining the filter, special pliers are needed to install or remove the filter housing. Due t...

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Problems solved by technology

[0003] The filter housing is an important part of the filter. At present, when assembling and maintaining the filter, special pliers are needed to install or remove the filter housing. Due to the large size of the special pliers, it is difficult to use It is not very convenient. At present, there is also a nut welded on the top of the filter shell, and then operated with a wrench, but this method has the following disadvantages: because the filter shell is relatively thin, it is easy to dislodge the filter shell when welding the nut. Breakdown, high scrap rate, difficult processing, after a long time, the weld is easy to rust, reducing the welding strength between the shell and the nut

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