SU1595673A1 - Mixing head for producing polymeric filling compounds - Google Patents

Abstract

The invention relates to equipment for mixing reactive oligomeric and other liquid components. The goal is to improve the quality of mixing. The mixing head comprises a housing 1, a mixing chamber 4 with nozzles 5, channels for supplying and recirculating the components, a dual hydraulic cylinder 8 and a hydraulic cylinder with rods. The removed components under pressure through the supply channels through the nozzles 5 enter the mixing chamber 4 in the form of turbulent jets tangentially. The pre-prepared mixture at the bottom of the mixing chamber enters the apertures 14, where two oppositely directed turbulent jets with the same geometrical and hydrodynamic characteristics are formed. The intensity of impact mixing is changed by adjusting the cross-sectional area of these throttling openings. Due to the preliminary mixing of two or more liquid components in any ratios, the technological capabilities of the mixing head are expanded. Impact mixing of a previously prepared mixture improves the quality of mixing. 4 il.

Description

The invention relates to equipment for mixing reactive oligomeric and other liquid components in order to obtain polymer casting compositions, in particular polyurethane, and can be used in the chemical and other sectors of the national economy.

The purpose of the invention is to improve the quality of mixing and expansion of technological capabilities.

Figure 1 shows a mixing head, a longitudinal section; Figures 2, 3, 4 show the sections A-A, B-B and B-B in Fig. 1, respectively.

The mixing head comprises a housing 1 with channels for supplying 2 and recirculating 3 components, a mixing chamber 4 with nozzles 5 and an output channel 5 formed in the chamber 7, which is the bottom of the mixing chamber 4, to which a dual hydraulic cylinder, 8 a rod-throttle 9 with a piston 10, the outer covering valve 11 with a piston 12, which is located eccentrically relative to each other, and a transverse cylindrical groove 13 formed at the butt end of the rod-throttle 9 and 4 two coaxial, opposite each other segment holes 14. The area of the holes 14 can be adjusted by the position of the rod-drossel 9 by means of a screw 15. On the locking-cleaning rod 11 there is a flashing 16 to connect the nozzles 5 with the holes 17 of the recirculation channels 3. A hydraulic cylinder 18 with a piston 19 and a cleaning rod 20 adjoins the chamber 7, communicating with the chamber 21, the position of which is regulated by a screw 22.

The device works as follows.

The withdrawn components under pressure through the channels 2 for their supply through the nozzles 5 enter the mixing chamber 4 in the form of turbulent jets tangentially, resulting in a swirling flow with an offset center of rotation. In such a flow, the particles of the liquid are stirred, spiraling downward at a variable oscillating velocity, which increases the intensity of mixing of the components. The pre-mix at the bottom of chamber 4 is choked into apertures 14, where two oppositely directed turbulent jets with the same geometrical and hydrodynamic characteristics are formed.

In addition, due to the swirling flow, the mixture’s homogeneity in composition in the outgoing jets is higher than the mixture’s uniform homogeneity at the inlet through the holes 14, which

Provides high quality blending when jets hit. The intensity of the impact mixing can be changed by adjusting the cross-sectional area of the throttling holes 14 with a screw 15. After

shock mixing the mixture from chamber 7 enters chamber 21 and further to exit into the cavity of the mold (not shown). If necessary, to improve the quality of mixing, the flow of the mixture from chamber 7 to

the chamber 21 can be carried out through a throttle opening created by the cleaning rod 20 (the position of the end of the rod in the drawing is shown by a dashed line). The cross section of this hole is controlled by a screw 19. After a certain batch of mixture has been made, the flow of components into chamber 4 stops. For this purpose, the locking and cleaning rod 11 is moved to the lower end position,

whereby the mixing head is transferred to the recirculation mode, by connecting the holes of the nozzles 5 through the flats 16 with the holes 17 of the recirculation channels 3. At the same time, the chamber 4 is cleaned

from the mixture, then the rod throttle 8, when moving, squeezes the mixture into the chamber 21. Cleaning this chamber and the surface of the canal. The knobs 13 of the rod-throttle 9 are made by a cleaning rod 20. The housing 1 for convenience

Manual cleaning of the chambers is made of several parts.

The invention allows for qualitative mixing of two or more liquid components in virtually any ratio.

Claims (1)

The invention includes a mixing head for producing polymer casting compositions, comprising a housing with inlet channels, a mixing chamber with nozzles and an outlet channel, a twin hydraulic cylinder adjacent to it, the throttle rod of which is set coaxially with the outlet channel and eccentrically relative to the surrounding its shut-off and cleaning rod and chamber, characterized in that, in order to improve the quality of mixing and expand technological capabilities, there is a transverse at the end of the rod-throttle a cylindrical groove, forming with the bottom of the mixing chamber opposite each other coaxial holes, and the nozzles of the mixing chamber are located tangentially. A-f ( fig 2 22 Fig.Z