High-pressure mixing device with sensored self-cleaning delivery duct

Abstract

A device for mixing at high-pressure two or more reactive liquid components or resins comprises a head-body provided with a mixing chamber with inlet and outlet openings for the injecting and recirculating reactive components; a single-piece tubular element, for delivering the mixture, communicates, through an intermediate transversal hole with the mixing chamber and slidingly houses a cleaning member; a valve member with longitudinal recirculation slots slides in the mixing chamber between a backward position, in which the inlet openings are released, and an advanced position, in which the inlet openings are put in communication with the respective outlet openings for recirculating the respective reactive components; the tubular element is removably inserted into a pass-through hole of the head-body, transversal to the mixing chamber, and it has an annular shoulder zone, separated and distant from the transversal hole; fixing elements removably lock the annular shoulder zone at the head-body for holding the tubular element in the aforesaid hole; a clearance gap between the tubular element and the pass-through hole of the head-body limits the contact area among them and minimizes the exchange of forces inside the hole; a gap is set for making the force pass a shoulder area for exchange; a sealing tool prevents leakage of a polymer mixture in reaction. Deformation-detecting elements detect locally the deformation conditions bear by the tubular element, and can monitor the working condition of the monitoring device.

Description

technical field [0001] The present invention relates to a device for mixing under high pressure liquid polymer components or reactive resins for forming a reactive polymer mixture for casting or infusion to produce various objects. The mixing device according to the invention is capable of processing polyurethane, epoxy, vinyl ester, polyester, silicon and phenolic resins. Background technique [0002] They are known in the art as mixing devices, in particular high-pressure self-cleaning L-shaped mixing heads, suitable for mixing polymer components, for example to obtain reactive chemical mixtures of reactive resins intended to be injected or delivered into moulds. The chemical mixture originates from the impingement of at least two jets inside a cylindrical chamber of circular cross-section called a mixing chamber. [0003] exist figure 1 , a known "L-shaped" self-cleaning mixing head is shown, some parts of which are shown in Figure 1A , 2 , 3, 4 and 5. [0004] Prio...

AI Technical Summary

Problems solved by technology

[0057] Unfortunately, in the mixing heads described above and discussed, it is impossible to foresee and prevent the formation of an asymmetric layer of hardened resin which is the beginning of scratches and seizures of contact metal-to-metal along the self-cleaning tubing

These phenomena put the mixing head in a state of severe wear during operation and inevitably force the replacement of the parts concerned, consisting in these cases of the head body and the extension of the self-cleaning duct, with significant additional maintenance costs and unavoidable Machine outages, which are economically harmful

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