UA78654C2 - Mixer for preparation of molding sand - Google Patents

Abstract

The invention relates to ferrous metallurgy. A mixer for preparation of molding sand contains a fixed cup, a block of three plows located inside the cup, which rotates relative to the central axis of cup, and eccentrically located one or several vortex heads, on each of which blades are fixed, the direction of rotation of which is opposite to the direction of rotation of the block of plows; moreover, the blades of vortex heads are located on the spiral with a shift of each next blade, which is located below relative to the preceding one, for the angle of 45-60 DEGREE . The invention ensures increase of efficiency of the processes of mass exchange and mixing the components of moulding mixture, shortening of the duration of working process, , raising the level of uniformity of obtained molding sand and reduction of loads on the drives of the unit of plows and vortex heads.

Description

mixers in foundries instead of mixers - reduction of loads on drives of the block of outdated structures. slugs and vortex heads.

The closest to the intended invention according to the specified technical result is achieved in terms of design and the technical effect achieved is due to the fact that in a mixer with a fixed bowl and a turbo-vortex mixer according to the patent of the WMO firm that rotates relative to the central axis of the bowl

IMPC B2205/04, SN 572772, dated April 1, 1974). The mixture is a block of three slugs, as well as eccentrically, the machine has a fixed bowl with two types of workers located relative to the axis of the bowl with one or several organs. The first of them is a block of three slugs with vortex heads, on each of which rotate around the central axis of the mixer, blades are fixed, the direction of rotation of which is opposite. with an inclination to the bottom of the vortex heads are arranged in a spiral with a shift of the mixer, the working blades of which are fixed on the edge of each subsequent blade, which is below, in one row and at an angle of 90" relative to the previous one at an angle of 45-60". This effect of each other and which rotate in the opposite direction is also achieved by the fact that the angle of inclination of the working line is perpendicular to the rotation of the slug block. upper slugs in relation to the plane of the bottom of the bowl

If the number of vortex heads installed in the mixer is 25-45". In addition, the achievement of the specified result is more than one head, then they are placed everywhere. The fact that the vortex head is located in the middle of the bowl so that the plows do not fit simultaneously inside the mixer body helps in such a way that with respect to two or more of them. During the operation of the mixer, the blades of the lower row of the vortex head from the working blades of the vortex heads capture the upper edges of the slugs is 10-15 mm. henna layers of the mixture moved along the bottom of the bowl. Location of the blades of the vortex heads by

In order to ensure a more intensive movement of the mixture, the spiral ensures more uniform processing of the mixture inside the bowl, the mixer plow from the side hanger, which is fed to the vortex head. In the resulting bowl, veneered to the central hub, the volume of the mixture is reduced, captured by each large number of vertically arranged flat blades, and when the wave of the mixture passes through the walls. through the vortex head with time intervals, rest

Among the disadvantages of this mixer, the following can be produced by the displacement angles of the blades of 45-60", in the volume: a large amount of vomited mixture is created. 1. The large distance between the blades of the vortex is the displacement platforms, on which the traps and plows are most intensively provides capture of the paddle - there are processes of mass transfer and mixing of the coma - only the upper layers that move into the bowl of the components of the mixture. On the other hand, with gradual mixing, which significantly reduces the efficiency of the introduction of an increasing number of mixers into the mixture wave, because when the slugs pass under the paddles of the vortex head is achieved smoothly by the vortex heads in each working cycle, the loads on the vortex head drive increase, there is no mixing of the upper layers, the peak loads that occur in the mash with the mixture that rises from the bottom with the plows are reduced with each passage of the plows. Depending on the of the mixer. volume of the mixture that is mixed on the vortex the vortex head in the trap can be installed from 6 to 12 rows, one row, a large area of each blade and the arrangement of the blades. their relation to each other at an angle of 90 does not contribute to the mutual displacement of the blades, successively placing the intensification of the process of crushing lumps that are from 45" to 60" relative to each other, is optimal. entry significantly reduces the efficiency of the mixing process into the flow of the forming mixture by no more than 5095 bursting of the mixture, reduces the size of the working area, the leakage from their total number in the vortex head, that of the head, and the large area of the blades and their mutual help to reduce the acting on the vortex head is caused by a perpendicular arrangement, ntanazhen. in addition, when the mixer is working, the choice of the angle of inclination of the working surface of the slugs to the peak loads on the electric motor of the mixer bowl drive in the range of 25-45", from one side of the vortex head, leading to the need for the side, provides a reduction in the frontal resistance of the movement engines of higher power - slugs in the mixture and the corresponding reduction in the load. The technical task of the invention is: to drive the block of slugs, and on the other hand, - to ensure intensive mixing allows to implement the technologically necessary sub-upper layers of the mixture with the mixture rising by of the mixture from the bottom of the mixer to a height corresponding to the slugs from the bottom of the mixer; well, the working height of the vortex head. - intensification of the process of grinding lumps. At a smaller angle of inclination of the slugs, the amount of spent mixture entering the mixer is reduced; the speed of the circular movement of the upper layers of the mixture is all - a reduction in loads on the drives of the unit inside the bowl of the mixer, which leads to the reduction of slugs and vortices x heads The technical result of the mass transfer between the layers of the mixture located on the volume expected from the use of the invention is: different distances from the bottom of the mixer. When increasing the efficiency of mass-mixing processes, the angle of inclination of the slugs is above 45" and the mixing of the forming components occurs, there is a sharp increase in the frontal resistance of the slugs from the corresponding mixture, a reduction in the duration of the working cycle; with an increase in the power consumption of them, the intensification of the lump crushing process mixture and ensuring high structural homogeneity If the distance from the lower blade of the vortex carrier of the mixture; the head to the upper edge of the slugs is 10-

15 mm, the most complete mixing is ensured by the rapidly rotating paddles of the latter. The loin of all layers of the mixture, fed by slugs to the winch, is introduced into the mixture, it is compressed by the pick-up head, and, accordingly, it grows and makes part of the mixture more efficient with its working surface, the process. At the same time, the minimum gap between the top is thrown to the opposite wall of the mixer, using the different edge of the slug and the vortex head to loosen and mix it. Under the action of the slugs, the mixture is constantly circulated in the volume of the bowl 1. In the course of each head on the body of the mixer. In Fig. 1, it is subjected to force many times and a cross-section of the mixer, in Fig. 2 - a view of the mixer in slugs and blades, which contributes to high-quality mixing - the plan, in Fig. 3 - a scheme for processing the mixture flow of all the main components of the mixture. After the end of the work cycle of mixing the provo-blades with a spirally arranged head, where: 1 - mixer bowl; 2 - block of plows; see discharge of the finished mixture through hatch 5.

Z - vortex head; 4 - working vanes of the vortex When processing a large mass of the mixture for the purpose of an integrated head; 5 - hatch for unloading the mixture. nsification of the mixing process in the mixer

The process of mixing the components of the mixture can be installed in more than one vortex head, the proposed mixer is carried out by two or more. It is most expedient to carry out the following working bodies: with blades 4 of the vortex head, the installation of several vortex heads at joints Z and with the plows of the plow block 2. With the promise of the diameter of the working bowl, which will allow the plow to rotate periodically, the mixture is lifted from the dit processing of the mixture at the same time on several areas of the mixer and turn it over, and when approaching its area. the mixture is raised to the vortex head and served! : I

It's tight Sha | with

Pd shni sh "te in tia

Senya o, ; and it is ancient, p n ni vn same 5 th

In ria I B - 7

Zine essay MORE -7 o i nn NECK : sen nya

Yav: eko vroda I (3-3 shen | our yav chi U --- s t Li y a KI ssstk tu

Fig. 1 ancient fay me; 2 dna Hn.

Y oi rn "detey y y , / Я SP Tv tt y shЩ

I Beh J

Sheen is not. PA "Vig. 3 nn UA and tr. and

Computer layout D. Sheverun Signature Circulation 26 approx.

Ministry of Education and Science of Ukraine

State Department of Intellectual Property, str. Urytskogo, 45, Kyiv, MSP, 03680, Ukraine

SE "Ukrainian Institute of Industrial Property", str. Glazunova, 1, Kyiv - 42, 01601