DE102006005971B4 - Plansichter - Google Patents

Abstract

Plan sifter for sifting mealy or granular products into various fractions or qualities, which is suspended vibratory and in the housing of a vibratory drive and at least one stack of sieves are arranged, the sieve stack is vertically braced from above, characterized in that the upper end of the sieve stack of an inlet frame (1) is formed, which has at least one front tensioning device (3) with at least one guide element by means of which a clamping element (8) is vertically movable.

Description

The invention relates to a Plansichter for screening or screening of floury or granular products in grain mills or other industrial mill operations.

Planifliers for the screening of floury or granular products in various fractions by means of many sieves, which are arranged in Siebstapeln, are well known. In this case, it is necessary to exactly position the stack of sieves in the housing of the plansifter and to clamp them securely in place for oscillating operation. This is usually done by positive reception of the screens in the planifier planer and a tension by means of a lockable front door and a clamping device that biases each stack of sieves vertically from above. The clamping force is applied manually.

Automatic tensioning devices are also known DE 10105647 A1 , which also includes a start-up control and a controlled retightening. Above each sieve stack, a lifting and lowering clamping frame with an actuator is arranged under the ceiling frame of the plansifter. Also disclosed are tensioning means for horizontal tensioning of the sieve stack. For this purpose, the clamping force is introduced via bevelled surfaces in two directions.

The invention has for its object to develop a Plansichter that allows a simple and externally controllable, vertical clamping of Siebstapeln. The solution of the problem is achieved with the features of the claim. Advantageous embodiments are disclosed in the subclaims.

According to the invention, the inlet or clamping frame is provided with a front tension which allows both the tensioning path and the tensioning force to be visible from the outside and which also permits automatic tensioning.

A coating of the inlet or clamping frame is avoided and in addition can be provided during clamping and releasing fixed stops.

At least one front tensioning device is provided. It is also possible to provide two front tensioning devices which are operated independently of one another or also have only one drive point of a front tensioning device which synchronizes the shafts of both front tensioning devices. By means of the front tensioning devices, a sieve stack is fixed at two or four points.

The invention will be described below in an embodiment with reference to a drawing. The drawing shows in

1 : an inlet frame with front tension

2 : a partial representation of a front voltage

3 : Detail of a side panel.

An applicant's plan sifter not explicitly shown has at least one screening compartment (usually up to ten screening compartments) with a sieve stack. The upper end of the sieve pile forms an entry frame 1 , the at least one product infeed 2 and two front tensioning devices 3 having. The front tensioning devices 3 have inlet pipes 4 on, by a clamping tool is inserted and at the same time indicate the state of stress. In extension of each inlet pipe 4 is in the inlet frame a connection shaft 5 provided on the tightening of the clamping element of the stack of sieves is clamped vertically at two points (thus at four points per inlet frame). The connecting shaft is advantageous 5 continue in a roughly centered warehouse 10 guided.

In a side part 6 the front tensioning device 3 is for a front and a rear clamping point depending on a cam 7 worked out, in which a role is led, which with a clamping element 8th corresponds. The Kuvenscheiben 7 as well as the springs 9 ensure a constant clamping force. When weakening the spring force retightening is possible.

Both cams 7 and clamping elements 8th act independently, so that the optimal clamping force is exerted on each clamping point.

When relaxing, the spindle / inlet pipe moves 4 to the outside and a sunken inlet pipe 4 signals a strained sieve pile.

Every inlet frame 1 can run up to four product inlets 2 exhibit.

LIST OF REFERENCE NUMBERS

1

lead-in frame

2

product inlet

3

Front clamping device

4

inlet pipe

5

connecting shaft

6

side panel

7

cam

8th

clamping element

9

feather

10

camp

Claims (6)

Plan sifter for sifting mealy or granular products into different fractions or qualities, which is suspended vibratory and in the housing a vibratory drive and at least one stack of sieves are arranged, wherein the sieve stack is vertically braced from above, characterized in that the upper end of the sieve stack of an inlet frame ( 1 ) is formed, the at least one front tensioning device ( 3 ) having at least one guide element, by means of which a clamping element ( 8th ) is vertically movable. Plan sifter according to claim 1, characterized in that two front tensioning devices ( 3 ) are provided. Planifter according to claim 1 or 2, characterized in that the guide element is a cam ( 7 ), in which a roller is guided, with the tensioning element ( 8th ) and their movement with the vertical movement of the clamping element ( 8th ) corresponds. Planifter according to claim 1, characterized in that the front tensioning device ( 3 ) is tensioned automatically, the clamping force is constant over the entire path. Plan sifter according to claim 1, characterized in that the inlet frame ( 1 ) at least one product infeed ( 2 ) having. Plan sifter according to claim 5, characterized in that the inlet frame ( 1 ) up to four product introductions ( 2 ) having.

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