DE1034955B - Impact centrifugal mill with a rotor rotating around a horizontal axis - Google Patents

Description

The invention relates to an impact centrifugal mill with a rotor rotating around a horizontal axis, this baffle plate assigned at a distance !! and a spacious surrounding rotor and baffle plates Housing through which heating gases are passed.

Passing heating gases through impact mills for grinding drying is more general than that Proposal known without any special information about the heating gas flow has been made so far.

It is also the subject of an older patent on impact mills for the treatment of moist grist the mill space provided above the rotor through partition walls into a central one in the area the baffle plates lying room and two side rooms to subdivide, with the heating gas supply in the middle room and the discharge through the side rooms should be done in such a way that the heating gases flow around the baffle plates. A partial flow can also pull through the mill from bottom to top.

In contrast, the invention proposes impact mills with a horizontal rotor in the area of the rotor and the baffle plates are essentially only pulled through by a uniform upward flow let what is achieved by the fact that the heating gases in all or substantially in the lower part of the housing and discharged above the rotor and the baffle plates. As with impact mills between rotor and baffle plates and between baffle plates and housing in general rich Interstices are provided, such guidance of the heating gases is in contrast to others Centrifugal mills can be achieved easily and without high pressures.

In the case of an impact mill-like device for drying heat-sensitive material, however, it is already known to let the heating gases pull from the bottom up through the housing of the device, the material being introduced into this upward stream from one side, so that lighter and good particles that have already been lightened by the drying are carried upwards by the gas flow, while the heavier parts fall down towards him. Here, however, the heating gases are on the side moved past the rotor so that the rotor itself is not washed.

In the case of an impact mill according to the invention, it is possible to use the fed laterally above the rotor Grist additionally to introduce heating gases into the housing, without thereby affecting the essence of the invention needs to be broken. However, the upward current in the area of the rotor and This does not cancel the impact plates.

It is advantageous if the impact centrifugal grinder assigned to the rotor

with around a horizontal axis

rotating rotor

Applicant:
Arno Andreas, Hanover, Ferdinandstr. 35

Arno Andreas, Hanover,
has been named as the inventor

Baffles with the exception of the side on which the feed opening is intended for the regrind, completely surrounds the rotor, i.e. also on the underside, in order to achieve as complete a comminution as possible. In order for the for the supply of the Regrind the gap provided in the baffle plates, no regrind parts upwards into the outlet opening for the hot gases can be hurled, the housing can be extended upwards like a shaft and are provided with additional baffle plates in this part above the side feed opening for the ground material.

The drawing schematically represents exemplary embodiments of the invention and shows in FIG

Fig. 1 an impact centrifugal mill in vertical section, in

Fig. 2 shows a detail of such a mill of a somewhat different design.

The fresh product reaches the sieve 2 via the feed nozzle 1 and slides on it into the housing 3 and in the area of the rotor 5. This hurls it by means of the blow bars 6 both against above the Sieves arranged baffle plates 15 as well as against the rest, arranged around the rotor 5 around Impact plates 4 and 8. The impact plates 4 are fixedly arranged. The baffle plates 8, however, sit on one Frame 9, which is on a parallel to the shaft of the rotor 5 Axis 10 is pivotably suspended and hangs on holders 11. Adjusting nuts 12 on the brackets 11 allow adjustment of the baffle plates, 8 during operation to influence the grain size of the Grist. The speed of the rotor 5 is preferably also adjustable.

Coarse particles, supported by the centrifugal effect of the rotor, get into the shaft 16 and fail here from the gas flow again, are through the return plate 14 to the rotor for further disintegration

809 578/249

downsizing fed back in. About a shielding effect of this sheet metal for the gas flow to compensate, it is expediently designed to be perforated. In the lower part of the case 13 heating gases are introduced through the nozzle.

The finished, dried fine material is released from the gas stream rising up through the shaft 16 of the housing 3 taken and passed into the cyclones 17 provided on the side of it, in which it is deposited is to be discharged from the bottom of the same by means of the screw 18, while the heating gases Remove through line 19.

Fig. 2 shows part of another embodiment in which the heating gas flow is partially is introduced through the feed nozzle 1, the material being fed via the double pendulum flap sluice 20 will.

Claims (4)

Patent claims: 1. Impact centrifugal mill with a rotor rotating around a horizontal axis, this at a distance associated baffle plates and a rotor and baffle plates spaciously surrounding the housing the heating gases are passed, characterized in that in an impact mill of this type at the housing above the rotor and the baffle plates the outlet opening for the hot gases has and is extended shaft-like down below the rotor and the baffle plates and in this part has an inlet opening for heating gases, the heating gases in the whole or in are essentially introduced into the lower part of the housing (3), so that these the rotor (5) and the baffle plates (4,8) in a steady upward flow wash around. 2. Impact centrifugal mill according to claim 1, characterized in that with the side above of the rotor (5) supplied grist, additional heating gases are introduced into the housing. 3. Impact centrifugal mill according to claim 1, characterized in that the rotor (5) assigned Impact plates (4, 8) with the exception of the side on which the feed opening (1) for the Regrind is provided. completely surround the rotor, including on the underside. 4. Impact centrifugal waste according to claim 3, characterized in that the housing is above of the rotor (5) is extended upwards like a shaft and in this part (16) above the lateral Feed opening (1) for the ground material has additional baffle plates (15). Considered publications:
German Patent Nos. 648 754, 691309, 508 919, 965 743; U.S. Patent No. 2,474,314;
British Patent No. 605,478;
Article Puffe: "Possibilities and advantages of using impact mills in processing" in the journal Erzmetall, 1950, issues 2 and 3, Fig. 1, and subsection "Mill drying". 1 sheet of drawings