Hydraulic pressure double column exhaust net changing device

Abstract

The invention discloses a hydraulic pressure double column exhaust net changing device. The hydraulic pressure double column exhaust net changing device comprises a supporting base, a first net changing column, a second net changing column, a first net changing column position switching mechanism and a second net changing column switching mechanism, wherein the supporting base comprises two stand column locating holes; the first net changing column and the second net changing column are respectively positioned in the two stand column locating holes, one side of the supporting base is provided with a material inlet, and the other side of the supporting base is provided with a material outlet; the two stand column locating holes are communicated with the material inlet and are both communicated with the material outlet; the first net changing column is provided with a first material passing hole, and the first material passing hole is internally provided with a first filter screen; and the second net changing column is provided with a second material passing hole, and the second material passing hole is internally provided with a second filter screen. The hydraulic pressure double column exhaust net changing device is characterized in that the first net changing column is also provided with an auxiliary material passing hole. The hydraulic pressure double column exhaust net changing device disclosed by the invention has the advantages that the whole net changing process can keep to be smooth all the time, the pressure fluctuation is smaller, the enough flux material can pass through a net changing device all the time, and a condition that the piece is broken is avoided.

Description

technical field [0001] The invention relates to extrusion molding equipment, in particular to a hydraulic double-column exhaust type screen changing device. Background technique [0002] The function of the screen changing device is to filter the melt material in the flow channel of the extruder to remove impurities in the melt material. [0003] The traditional screen changer is a plate-type screen changer. The plate-type screen changer has a large pressure fluctuation when changing the screen and there will be air bubbles in the mesh, and the plate-type screen changer will be short of material at the moment it starts working. As a result, air bubbles may remain in the product and fragments may occur, resulting in waste products. [0004] The hydraulic double-column exhaust type screen changing device announced by the Chinese utility model manual CN201998409U includes a support base, two screen changing columns and two position switching mechanisms (ie reciprocating motion...

AI Technical Summary

Problems solved by technology

However, during the production process, the screen needs to be changed only when it is detected that the mesh holes on the filter screen are severely blocked (at this time, the pressure sensor can detect that the pressure in front of the filter screen exceeds the preset value). The capacity is very small, so that during the screen changing process, when the first screen changing column is sent to the screen changing position, although the other screen changing column is still in the normal working position, because the filter screen on the material passing hole is Severe blockage, only relying on this feeding hole can only allow a very small amount of melt material to pass through. Therefore, in the process of changing the screen on the first screen changing column, it is easy to break due to too little passing material. As a result, it is necessary to re-thread the film, which consumes a lot of time and affects the normal production

Moreover, when the first screen changing column is sent to the screen changing position, the pressure in front of the filter screen of the other screen changing column increases sharply, and there are large pressure fluctuations, resulting in unstable products produced during the screen changing process (such as uneven thickness of the sheet)

Images