DD288285A7 - PLAN CLASSIFIERS - Google Patents

Abstract

The invention relates to a plansifter. It is an object of the invention to increase the maximum number of sieve frames which can be brought about one another, while maintaining the drawer principle. According to the invention, the object is achieved by dividing the screen frame ladders into pairs of opposing screen frame ladder segments. The invention relates Plansichter with a pair of Siebrahmenleitern each Plansichterabteil for receiving screen frame. Fig. 2 {plansifter; Plansichterabteil; Number of sieve frames; Siebrahmenstapel; Drawer principle; Siebrahmenleitern; Pairs of screen frame ladder segments; lying opposite; vertically movable}

Description

For this 2 pages drawings

Field of application of the invention

The invention relates Plansichter with a pair of Siebrahmenleitern each Plansichterabteil for receiving screen frame, which form a sieve stack in mutually braced state and rest in a relaxed state without mutual contact with each other on the Siebrahmenleitern.

Characteristic of the known state of the art

In the plan sifter, screen frames are stacked on top of each other to form stackers and clamped in a frame that is suspended in free-swinging mode.

To carry out a variety of jobs, it is necessary to solve the tension. Thereafter, each screen frame, regardless of the above or below arranged, individually pulled out (drawer principle).

In practice, this is in principle solved so that each screen frame is laterally equipped with strips that rest in the unstressed state of the screen stack on guide rails. These guide rails are connected at equal intervals with vertical profiles and form together with these Siebrahmenleitern. The distance between the guide rails is chosen so that there is an air gap between the relaxed sieves, which ensures the individual pulling out of any sieve frame. The screen frame ladders are firmly attached to the frame. In the vertical clamping process, the screen frames are lifted successively from bottom to top and pressed together after overcoming all air gaps. The lateral strips of the screen frame are lifted off the guide rails.

When vertically clamped from above, the pair of screen frame ladders are mounted vertically displaceable on the frame. During the clamping process, the pair of Siebrahmenleitern is lowered, so that the sieve frame successively stack from bottom to top and then pressed together.

The principal disadvantage of both variants is that the maximum number of sieve frames that can be brought onto one another is limited. The maximum number depends on the height of the screen frame and the distance between the screen frame in a relaxed state.

Object of the invention

The aim of the invention is to increase the performance of Plansichtern by better utilization of the enclosed space to achieve the improvement of the mass-power ratio and reduction of specific energy consumption.

Explanation of the essence of the invention

It is an object of the invention to increase the maximum number of superimposed sieve frame while maintaining the drawer principle.

According to the invention the object is achieved in that the Siebrahmenleitern are divided into pairs of opposing Siebrahmenleiternsegmente, of which a pair of fixed and the remaining vertically movable or all pairs are vertically movable. As a result, when clamping the screen frames with each other to form a screen stack on each pair of screen frame conductor segments, the characteristic process of touching the screen frames with each other is newly introduced in order; also in reverse order when relaxing the sieve stack. The disadvantage of the limitedness of the maximum number of sieve frames which can be brought onto one another as a function of the height of the individual sieve frames and the distance between the sieve frames, in the relaxed state, is thus fundamentally eliminated, while retaining the advantages of the drawer principle.

embodiment

The invention will be explained in more detail below using an exemplary embodiment.

Fig. 1: shows a detail of the support frame 4 with screen frame 8 in the clamped state Fig. 2: shows a detail of the support frame 4 with screen frame 8 in the relaxed state

Superimposed sieve frames 8 form a sieve stack. Plan sifter may consist of two, four, six or eight sieve stacks, which are each arranged together in a support frame 4.

About a clamping device, which is not shown, there is a clamping frame 7, with which the adjustable stops 5 are firmly connected. The lower pair Siebrahmenleiternsegmente 1 is vertically movable and is guided by attached to it rollers 2, which run on fixedly connected to the support frame 4 guide columns 3. The upper pair Siebrahmenleiternsegmente 1 a is rigidly connected to the support frame 1. Each Siebrahmenleiternsegment 1 is loosely connected to the überihm Siebrahmenleiternsegment 1 a connected via the adjustable stops 6. By operating the clamping device 7 arranged under the clamping frame, the sieve frame 8 are successively raised from bottom to top. In this case, the air gap between the sieve frame 8 is overcome, so that they lie on each other and no longer on their support strips 9. With the achievement of overcoming the distance between the adjustable stops 5 and the pair Siebrahmenleiternsegmente 1 and the simultaneous resting of belonging to the pair Siebrahmenleiternsegmente 1 uppermost Screen frame 8 on the underlying this is moved in the course of the tensioning process by the stops 5 with upward. This makes it possible to restart the characteristic process of touching the screen frames 8 with each other, flowing in order with the lowermost screen frame 8 belonging to the pair of screen frame conductor segments 1a, and to perform until completion.

Claims (7)

1. plansifter with a pair of Siebrahmenleitern each Plansichterabteil for receiving screen frame, which form a stack of sieves in mutually braced state and rest in the relaxed state without mutual contact with each other on the Siebrahmenleitern, characterized in that the Siebrahmenleitern are divided into pairs of opposing Siebrahmenleiternsegmente (1 1 a). 2. plansifter according to claim 1, characterized in that in the Plansichterabteil only pairs of vertically movable Siebrahmensegmente (1) exist. 3. plansifter according to claim 1, characterized in that in Plansichterabteil the uppermost pair Siebrahmenleiternsegmente (1 a) immovable and the remaining pairs Siebrahmenleiternsegmente (1) are vertically movable. 4. plansifter according to claim 2 or 3, characterized in that the superimposed and vertically movable Siebrahmenleiternsegmente (1) via rollers (2) on common guide columns (3) which are fixedly connected to a support frame (4) are guided. 5. plansifter according to claim 2 or claim 3, -dadurch in that the minimum and maximum distance of the superimposed Siebrahmenleiternsegmente (1, 1 a) by adjustable stops (5) and (6) is adjustable in the relaxed state. 6. plansifter according to claim 5, characterized in that the adjustable stops (5) with a clamping frame (7) are firmly connected. 7. plansifter according to claim 6, characterized in that the distance between the stops (5) and the lowermost pair Siebrahmenleiternsegmente (1) is greater, up to an air gap between the relaxed screen frame (8), as the sum of all the air gaps among the relaxed Screen frames (8) belonging to the pair of screen frame ladder segments (1).