DE904831C - Pendulum scales, in particular conveyor belt or conveyor belt dosing scales - Google Patents

Description

For registration purposes it is necessary, especially with continuous weighing, that also with Pendulum scales the angular deflection of the pendulum increases proportionally with the load, thus with the Summing up the individual angular deflections, the sum of the individual loads is given at the same time.

To achieve this goal, the lever arm must be one of the angular deflection for the load acting on the pendulum have dependent length. In the previous embodiments, one often has that of The load to be determined by the scales can be attacked via a steel belt that is on a pendulum axis seated eccentric rolls tangentially, which actually moves the lever arm depending on the angular deflection changes. With such a method one can of course only approximate the problem posed to solve. Adjustment must be made on a case-by-case basis, with the help of tare weights adjust the pendulum so that it works with the required accuracy for the task at hand. If the balance is to be switched to a different weight range, it is inevitably a new one Adjustment of the pendulum connected.

Other methods are also known in which by a certain lever transmission or with With the help of a balance weight an approximate linearity of the pendulum swing is achieved.

The following considerations show one way of eliminating the often very time-consuming adjustment work of the bypasses a pendulum already built into the balance and which also enables the transition from one weight range to another without the pendulum to be misaligned. The prerequisite for this is that the lever arm on which the load acts is not approximately but is reduced according to a mathematical-physical formula.

According to the invention, a computationally determined curve shape is used instead of the hitherto customary eccentric

chosen so that the effective attack lever arm of the tension band in the entire area of the pendulum deflection angle (α = 0 to α = ■ max.) the value

ö · - ^ 5-ü corresponds. This ensures that α ^r

the adjustment can be effected by a one-time alignment of the curve relative to the pendulum, namely it is important that the curve is oriented relative to the pendulum in such a way that when it is vertically hanging ίο Pendulum the unloaded drawstring at the maximum lever arm

b lim

sin α

attacks. A tare weight is expediently provided, through which a vertical pendulum position is adjustable for the assigned curve position.

In Fig. Ι such a pendulum is in his systematic structure shown.

On the curve piece ι with the base b , a steel band 3 is fastened by means of a screw 2, on which the load K on the balance engages in the vertical direction. The axis of rotation of the pendulum is denoted by A. Under the action of the force K , the pendulum is deflected by a very specific angle, the steel strip 3 rolling on the curve piece ι and the lever arm is reduced according to the angular deflection in the sense described above. It is important, however, that the steel band is really at the point that is determined by the calculation with the load K = O, which corresponds to a vertically hanging pendulum

sin α

ο · hm

^α -ο

is marked, lifts from the curve piece. This setting is made using the tare weight 4, which is moved on the rail 5 until the lower edge of the curve piece is exactly aligned with the horizontal. This setting can be carried out outside of the scale e.g. B. on an auxiliary stand for the Pendulum can be made and, once made, does not need to be changed. So one could achieve the same goal through a simple one Achieve mass balance and on the structural complexity of the rail 5 with the taring weight 4 waive.

Fixed by the construction, the pendulum rail 6 is perpendicular to the lower edge of the curve piece ι. The running weight 7 can be moved on this pendulum rail 6. This is set according to the desired weight range of the balance. If the scales are to be able to capture very large loads with a certain maximum angular deflection of the pendulum, the distance between the center of gravity S 'of the running weight 7 and the suspension point A will be chosen large and shortened accordingly for smaller weighing ranges. Since, due to its guidance on the rail 6, the center of gravity S 'can only move on the alignment line of the suspension point A with the center of gravity S of the pendulum, which has been neatly set by means of the taring weight 4, without a running weight 7, a misalignment of the pendulum with its curved piece 1 not done at all if the weighing range is changed. The rail 6 has a scale according to which the running weight 7 is adjusted so that every possible weighing range within the framework of the pendulum can be adjusted quickly and safely.

Fig. 2 shows a complete incline scale system. The lever 9 rests on the cutting edge 8, on which on the one hand the weighing pan 10, the weighing belt or the like sits and on the other hand the tare weight 11 is arranged displaceably. In addition, the steel strip 3 engages at point 12. Since the steel belt should be exposed to a certain tensile load, even when the balance is not loaded, so that it cannot disengage, for example, with a cutting edge suspension, the zero point 13 of the balance is set so that the pendulum is already at the angle a _{0 in this zero position} is deflected. This setting is made with the help of the tare weight 11. The size of the angle α “can be chosen freely. The weight scale of the balance is strictly linear starting from zero point 13.

Claims (5)

PATENT CLAIMS: 1. Pendulum scales, especially conveyor belt scales, where the load is attached to a pendulum Acts curve by means of a drawstring, characterized in that the curve foim so is chosen that the effective attack lever arm of the tension band in the entire area of the Pendulum deflection angle (α = 0 to α = max.) Dem ..., sin α,. ,, Value 0 corresponds. 2. Pendulum balance according to claim 1, characterized that the curve is oriented relative to the pendulum in such a way that when it is vertically hanging Pendulum the unloaded drawstring at the maximum lever arm δ ■ Hm sin α α-0 attacks. 3. Pendulum balance according to claim 2, characterized in that a tare weight is provided is, through which a vertical pendulum position can be set for the assigned curve position. 4. Pendulum balance according to claim 2 or 3, characterized in that the setting of the weighing range takes place by shifting a running weight along the pendulum rail, such that the The system's center of gravity is the same for all settings, thanks to the pendulum suspension point outgoing alignment remains. 5. Pendulum balance according to claim ^, characterized in that that a scale is provided for setting the running weight on the pendulum. 120 Cited pamphlets: German Patent Nos. 510 947, 608 946. . 1 sheet of drawings © 5767 2.54